CN206611336U - Series-to-parallel converter with multi input and use its charging and conversion electric facility - Google Patents

Abstract

The utility model provides a multi-input hybrid converter and a charging and changing facility using the same, belonging to the technical field of converters. The hybrid converter of the utility model includes a plurality of direct current inputs, an inverter circuit module with a plurality of inverter units arranged in parallel, an AC/DC conversion circuit module, and has a composite hybrid topology. The charging and changing facility of the utility model uses the hybrid converter, which can be connected to different types of power input.

Description

Hybrid converter with multiple inputs and charging and swapping facility using it

technical field

The utility model belongs to the technical field of converters, and relates to a DC/DC converter, in particular to a converter with a parallel structure with multiple DC inputs and a charging and swapping facility using the converter.

Background technique

Converters include DC/DC converters and AC/DC converters, which are commonly used components in charging and swapping facilities such as charging stations. In the field of vehicle charging technology, it is necessary to build enough charging stations to charge electric vehicles to solve the problem of range anxiety of users.

The power input of traditional charging stations is generally the power grid or batteries. However, in some special occasions with imperfect infrastructure or under special conditions (such as power supply failures), it is difficult to ensure that the car can be charged in time, and the charging convenience is poor. User experience; for example, some charging stations are only compatible with AC grid input, and under some environmental conditions there is a power outage of the grid, so the charging station cannot charge the vehicle; for example, some charging stations are only compatible with photovoltaic module power input , there may be situations where the solar cells do not generate enough electricity to charge the vehicle. With the rapid popularization of new energy vehicles, the requirements for charging stations that can meet multiple application scenarios are also getting higher and higher.

In addition, the inverters used in charging and swapping facilities such as traditional charging stations are required to set switching tubes with higher voltage stress levels to meet the high-voltage system requirements of charging and swapping facilities. the cost of.

Utility model content

One of the purposes of the present utility model is to provide a new converter.

Another purpose of the present utility model is to provide a charging and swapping facility that can meet multiple application scenarios and improve the convenience of charging.

In order to achieve the above objectives or other objectives, the utility model provides the following technical solutions.

According to an aspect of the present invention, a hybrid converter (100, 200) is provided for converting a DC input (110) into a DC output, and the converter (100, 200) includes:

N DC inputs (110), wherein N is an integer greater than or equal to 2, and the N DC inputs (110) are sequentially connected in series, any one of the N DC inputs (110), or at least The combination of the two is used to provide a DC source for the hybrid converter (100, 200);

An inverter circuit module (120, 220), which has at least two inverter units arranged in parallel, wherein the input end of each inverter unit is connected to one of the N DC inputs (110), at least The coil output terminals of the two inverter units are arranged as parallel outputs, and the two parallel inverter units share a DC bus, so as to realize the connection between the switching tubes of the two parallel inverter units. forming a series connection; and

An AC/DC conversion circuit module (130), configured to rectify and filter the AC signals output from the N coil output terminals of the inverter circuit module (120, 220) to form a DC output.

In the hybrid converter according to an embodiment of the present invention, the inverter circuit module (120, 220) has at least N inverter units arranged in parallel, wherein the input terminals of the N inverter units are respectively The N DC inputs (110) are connected one by one correspondingly, the coil output ends of the N inverter units are arranged as parallel outputs, and the adjacent inverter units among the N inverter units arranged in parallel The DC bus is shared between them, so that the switching tubes of the adjacent inverter units are connected in series.

In the hybrid converter according to an embodiment of the present invention, the first input terminal and the second input terminal of the nth DC input (110) are respectively connected to the nth inverter circuit module (120, 220) the first DC bus and the second DC bus of an inverter unit;

The first input terminal and the second input terminal of the (n+1)th DC input (110) are respectively connected to the first a DC bus and a second DC bus;

Wherein, the second input end of the nth DC input (110) is connected in series with the first input end of the (n+1)th DC input (110), and the second input end of the nth DC input (110) The DC bus is shared with the first DC bus of the (n+1)th DC input (110);

Wherein, n is an integer, 1≤n<N.

In the hybrid converter according to an embodiment of the present invention, the N DC inputs ( 110 ) have DC voltages of the same magnitude, and the two inverter units have the same configuration.

In the hybrid converter according to an embodiment of the present invention, the inverter unit is a single-phase or multi-phase full-bridge inverter unit, or a single-phase or multi-phase half-bridge inverter unit.

Specifically, the inverter unit is an H-bridge inverter unit, and the coil output end of the inverter unit is arranged on the bridge of the H-bridge;

Wherein, the switch tubes on the main line (W ₂₁ , W ₂₂ ) of the H-bridge inverter unit are connected in series with the switch tubes on the main line of the adjacent H-bridge inverter unit.

In the hybrid converter according to an embodiment of the present invention, when the nth one of the N DC inputs (110) is used to provide a DC source for the hybrid converter (100, 200), by controlling the inverter switch tubes in the inverter units to make at least one of the inverter units work, or to make at least two of the inverter units work in parallel.

In the hybrid converter according to an embodiment of the present invention, the AC/DC conversion circuit module (130) has at least two coil input terminals and a DC output terminal (131), and the two coil input terminals are respectively connected to the The coil output terminals of the two parallel inverter units are coupled.

The hybrid converter according to an embodiment of the present invention, wherein the middle part of the inductance coil of each of the at least two coil input ends is drawn out through a first wire (W ₃₁ ), and then connected to the DC output together end (131) of the first end;

Both ends of the inductance coil of each of the at least two coil input ends are respectively connected to the second wire (W ₃₂ ) through a rectifier diode, and then are commonly connected to the DC output end (131) through the second wire (W ₃₂ ) the second end of .

According to another aspect of the present utility model, a charging and swapping facility (10) is provided, which includes:

a hybrid converter (100, 200) as described above; and

N different types of power supply inputs are respectively corresponding to the N direct current inputs (110) connected to the hybrid converters (100, 200).

The charging and swapping facility according to an embodiment of the present invention, wherein the power input is connected to the corresponding DC input (110) of the parallel converter (100, 200) through an AC/DC converter or a DC/DC converter ), or directly connected to the corresponding DC input (110) of the hybrid converter (100, 200).

In the charging and swapping facility according to an embodiment of the present invention, the N different types of power input include: a power grid, a generator, and a DC power supply.

In the charging and swapping facility according to an embodiment of the present invention, the DC power supply is a photovoltaic module or a power battery of a vehicle.

According to the charging and swapping facility according to an embodiment of the present utility model, the charging and swapping facility (10) is a vehicle charging and swapping facility.

The hybrid converter of the utility model has a unique topological structure, and has low requirements on the voltage stress level of the switch tube, and is especially suitable for a high-voltage conversion system. Moreover, the output power of each inverter unit is controllable, and the overall DC output power can also be controlled. Control, easy to meet various power output requirements, THD (Total Harmonic Distortion) characteristics are good. When applied to charging and swapping facilities, different types of power inputs can be connected, which can easily solve the charging restrictions of charging and swapping facilities on special occasions or special environmental conditions, improve the convenience and robustness of charging, and provide a good user experience , and it can meet the charging needs of vehicles in various scenarios.

Description of drawings

The above and other objects and advantages of the present invention will be more fully understood from the following detailed description in conjunction with the accompanying drawings, wherein the same or similar elements are denoted by the same reference numerals.

FIG. 1 is a schematic diagram of a circuit structure of a hybrid converter according to an embodiment of the present invention.

FIG. 2 is a schematic structural diagram of the inverter unit in FIG. 1 .

FIG. 3 is an equivalent circuit diagram of the hybrid converter of FIG. 1 in a working situation.

FIG. 4 is an equivalent circuit diagram of the hybrid converter of FIG. 1 in another working condition.

Fig. 5 is a schematic diagram of a circuit structure of a hybrid converter according to another embodiment of the present invention.

FIG. 6 is a schematic structural diagram of the inverter unit in FIG. 5 .

Fig. 7 is a schematic diagram of a circuit structure of a hybrid converter according to yet another embodiment of the present invention.

Fig. 8 is a schematic structural diagram of a charging and swapping facility according to an embodiment of the present invention.

detailed description

The present invention will now be described more fully with reference to the accompanying drawings, in which exemplary embodiments of the invention are shown. However, this invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the present invention to those skilled in the art. In the drawings, the same reference numerals designate the same or similar elements or components, and thus, descriptions thereof will be omitted.

In the following description, for clarity and conciseness of description, not all the various components shown in the figures are described in detail. The accompanying drawings show a number of components for those skilled in the art to fully realize the utility model, and for those skilled in the art, the operations of many components are familiar and obvious.

Figure 1 is a schematic diagram of the circuit structure of a hybrid converter according to an embodiment of the present invention, Figure 2 is a schematic structural diagram of the inverter unit in Figure 1, and Figure 3 is a schematic diagram of the hybrid converter in Figure 1 The equivalent circuit diagram in one working situation, FIG. 4 shows the equivalent circuit diagram of the hybrid converter in FIG. 1 in another working situation. The hybrid converter 100 of the embodiment of the present utility model will be described in detail below with reference to FIGS. 1 to 4 .

As shown in FIG. 1 , the hybrid converter 100 is a DC/DC (direct current-direct current) converter, which has multiple DC inputs 110 as input terminals, an inverter circuit module 120 and an AC/DC conversion circuit module 130. The conversion circuit module 120 and the AC/DC conversion circuit module 130 are used together to complete the DC-DC conversion function of the converter. Wherein, the DC input 110 itself does not provide a DC source, but is a port for inputting or accessing a DC source.

In FIG. 1 , three DC inputs 110 are taken as an example for illustration. Correspondingly, the inverter circuit module 120 is also described by taking three inverter units (ie, inverter units 121 , 122 and 123 ) as an example. It should be understood that the specific number of DC input 110 and inverter units in the hybrid converter 100 is not limited to the embodiment of the present invention, and the number can be increased or decreased according to the needs of specific applications.

As shown in Figure 1, the three DC inputs 110 ₁ , 110 ₂ and 110 ₃ are respectively set corresponding to the inverter units 121, 122 and 123 arranged in parallel, and they constitute the multi-input parallel topology of the parallel-connectable converter 100 . From the standpoint of the three DC inputs 110 ₁ , 110 ₂ and 110 ₃ , the three DC inputs 110 ₁ , 110 ₂ and 110 ₃ are sequentially connected in series, specifically, the input terminal 110 _1b of the DC input 110 ₁ is connected in series It is connected to the input end 110 _2a of the DC input 110 ₂ , and the input end 110 _2b of the DC input 110 ₂ is connected in series to the input end 110 _3a of the DC input 110 ₃ , thereby realizing the sequential series connection between them. However, from the perspective of the three DC inputs 110 ₁ , 110 ₂ and 110 ₃ and the inverter units 121 , 122 and 123 , each DC input is set together and in parallel with the corresponding inverter units.

It should be noted that any one of the three DC inputs 110 ₁ , 110 ₂ and 110 ₃ or a combination of at least two of them can serve as the DC source of the hybrid converter 100 , that is, form the DC input of the hybrid converter 100 source.

As shown in Figure 1, the inverter circuit module 120 is used to convert the input DC source into an AC output. In this embodiment, the inverter circuit module 120 is a composite hybrid structure, that is, a combination of series and parallel forms exists to form Hybrid topology. First, from the perspective of the arrangement of multiple inverter units in the inverter circuit module 120, the three inverter units 121, 122 and 123 are arranged in parallel, and the input terminals of the three inverter units 121, 122 and 123 are respectively Correspondingly connected to the DC inputs 110 ₁ , 110 ₂ and 110 ₃ , the coil output terminals L ₁₁ , L ₂₁ and L ₃₁ of the three inverter units 121, 122 and 123 are also arranged in parallel, that is, arranged to have parallel outputs; Secondly, from the point of view of the connection relationship among the multiple inverter units in the inverter circuit module 120, the adjacent inverter units among the parallel inverter units 121, 122 and 123 share the DC bus, thereby realizing phase Switch tubes of adjacent inverter units are connected in series.

The structure of each inverter unit in the inverter circuit module 120 is the single-phase H-bridge inverter of the embodiment shown in FIG. On the main line, the other two switching tubes S are set on another main line, and the two main lines are connected by a bridge, and the inductance coil L is set on the bridge to form the coil output end; a capacitor C is connected across the two DC bus bars , a capacitor C can also be set on the DC bus. Among them, each main line is connected to the upper and lower two DC buses of the inverter unit, and the switching tubes can be but not limited to fast thyristors, turn-off thyristors (GTO), power transistors (GTR), power field effect transistors (MOSFET) or Insulated gate transistors (IGBTs), etc., switch tubes can be driven and controlled by various control signals such as PWM to turn on, turn off, or turn on.

Specifically corresponding to the inverter unit 121 in FIG. 1 , the inverter unit 121 has four switch tubes S ₁₁ , S ₁₂ , S ₁₃ and S ₁₄ , capacitors C ₁ and capacitor C ₁₂ , and an inductance coil L ₁₁ ; the inverter unit 121's DC bus W ₁₁ and W ₁₂ are connected through the main line W ₂₁ and W ₂₂ , and the capacitor C1 is connected across the DC bus W ₁₁ and W ₁₂ ; wherein, two switch tubes S ₁₁ and S ₁₃ are set in series on the main line On W ₂₁ , two switching tubes S ₁₂ and S ₁₄ are set in series on the main line W ₂₂ , and the two ends of the bridge are respectively connected between switching tubes S ₁₂ and S ₁₄ , between switching tubes S ₁₁ and S ₁₃ , and the inductor The coil L ₁₁ is set on the bridge, which serves as the coil output end of the inverter unit 121 and also provides an input for the AC/DC conversion circuit module 130 ; wherein, the capacitor C ₁₂ is set on the DC bus W ₁₂ . By controlling the turn-on and turn-off combinations of the four switch tubes S ₁₁ , S ₁₂ , S ₁₃ and S ₁₄ of the H-bridge inverter unit 121 , the inductance coil L ₁₁ can output different levels.

Specifically corresponding to the inverter unit 122 in FIG. 1, the inverter unit 122 is arranged between the inverter units 121 and 123, the inverter unit 122 is arranged in parallel adjacent to the inverter unit 121, and the DC bus _W12 is shared between them. , the inverter unit 122 is also arranged adjacent to the inverter unit 123 in parallel, and they share the DC bus W ₁₃ . The inverter unit 122 has four switch tubes S ₂₁ , S ₂₂ , S ₂₃ and S ₂₄ , capacitors C ₂ and C ₂₃ , and an inductance coil L ₂₁ ; the DC bus bars W ₁₂ and W ₁₃ of the inverter unit 122 also pass through the main The lines W ₂₁ and W ₂₂ are connected, and the capacitor C2 is connected across the DC bus W ₁₂ and W ₁₃ ; wherein, two switching tubes S ₂₁ and S ₂₃ are arranged in series on the main line W ₂₁ , and the two switching tubes S ₂₂ and S ₂₄ is set in series on the main line W ₂₂ , the two ends of the bridge are respectively connected between the switch tubes S ₂₂ and S ₂₄ , and between the switch tubes S ₂₁ and S ₂₃ , and the inductance coil L ₂₁ is set on the bridge, which acts as The coil output end of the inverter unit 122 also provides an input for the AC/DC conversion circuit module 130 ; wherein, the capacitor C ₂₃ is set on the DC bus W ₁₃ . By controlling the turn-on and turn-off combinations of the four switches S ₂₁ , S ₂₂ , S ₂₃ and S ₂₄ of the H-bridge inverter unit 121 , the inductance coil L ₂₁ can output different levels.

Specifically corresponding to the inverter unit 123 in FIG. 1 , the inverter unit 123 has four switch tubes S ₃₁ , S ₃₂ , S ₃₃ and S ₃₄ , a capacitor C ₃ and a capacitor C ₂₃ , and an inductance coil L ₃₁ ; the inverter unit 121's DC bus W ₁₃ and W ₁₄ are connected through the main line W ₂₁ and W ₂₂ , and the capacitor C ₃ is connected across the DC bus W ₁₃ and W ₁₄ ; wherein, two switching tubes S ₃₁ and S ₃₃ are set in series on the main On the line _W21 , two switching tubes _S32 and _S34 are arranged in series on the main line _W22 , and the two ends of the bridge are respectively connected between the switching tubes _S32 and _S34 , between the switching tubes _S31 and _S33 , The inductance coil L ₃₁ is set on the bridge, which serves as the coil output end of the inverter unit 123 and also provides an input for the AC/DC conversion circuit module 130 ; wherein, the capacitor C ₂₃ is set on the DC bus W ₁₃ . By controlling the turn-on and turn-off combinations of the four switch tubes S ₃₁ , S ₃₂ , S ₃₃ and S ₃₄ of the H-bridge inverter unit 123 , the inductance coil L ₃₁ can output different levels.

Therefore, the switching tubes of the inverter units 121, 122 and 123 in the above embodiment are connected in series, for example, S ₁₁ , S ₁₃ , S ₂₁ , S ₂₃ , S ₃₁ and S ₃₃ on the main line W ₂₁ are connected in series Yes, S ₁₂ , S ₁₄ , S ₂₂ , S ₂₄ , S ₃₂ and S ₃₄ on the main line W ₂₂ are connected in series. Of course, the combination of series connection is not limited to the above embodiment, for example, different inverter units Switch tubes on different main lines W ₂₁ and W ₂₂ are also connected in series.

As shown in Fig. ₁ , the input terminal 1101a and the input terminal 1101b of the DC input ₁₁₀₁ are respectively connected to the DC bus _W11 and the DC bus W12 _of the inverter unit 121, and the input terminal _1102a and the input terminal ₁₁₀₂ of the DC input _{1102 1102b} is respectively connected to the DC bus _W12 and the DC bus _W13 of the inverter unit 122, and the input end _1103a and the input end _{1103b of} the DC input ₁₁₀₃ are respectively connected to the DC bus _W13 and the DC bus W14 of the inverter unit 123; Wherein, the DC bus W ₁₂ is the DC bus shared by the inverter unit 121 and the inverter unit 122 , and the DC bus W ₁₃ is the DC bus shared by the inverter unit 122 and the inverter unit 124 .

In one embodiment, preferably, the DC input 110 ₁ has the same DC voltage V ₀ , and the arrangement of each inverter unit is basically the same, for example, the switches S used by each inverter unit are the same, and the capacitors C ₁ and C ₂ It is basically the same as the capacitance _of C3.

It should be noted that, in the above embodiments, a single-phase full-bridge inverter unit is used as an example for illustration. Those skilled in the art will understand that if two-phase or three-phase inverters are required, the above single-phase inverter unit can be analogously applied. The basic structures of the inverter units are combined to form a two-phase full-bridge inverter unit or a three-phase full-bridge inverter unit. The full-bridge architecture in the above embodiments is formed based on hard switching tubes, or it can be a full-bridge architecture based on LLC (combination of inductance L and capacitor C) and phase shifting. The functions of LLC and phase shifting are equivalent to those in the above embodiments. "turning tube".

As shown in FIG. 1 , in this embodiment, the AC/DC conversion circuit module 130 has three inductance coils L ₁₂ , L ₂₂ and L ₃₂ , wherein the inductance coil L ₁₂ is coupled with the inductance coil L ₁₁ to form a transformer unit, the inductance coil L ₂₂ is coupled with the inductance coil L ₂₁ to form another transformer unit, and the inductance coil L ₃₂ is coupled with the inductance coil L ₃₁ to form another transformer unit; therefore, the three outputs of the inverter circuit module 120 can be transformed After voltage processing, the inductance coils L ₁₂ , L ₂₂ and L ₃₂ are input to the AC/DC conversion circuit module 130 , and the inductance coils L ₁₂ , L ₂₂ and L ₃₂ constitute the coil input end of the inverter circuit module 120 . Further, the middle part of each of the inductance coils L ₁₂ , L ₂₂ and L ₃₂ is drawn out through the wire W ₃₁ , and then connected to the first end of the DC output terminal 131 of the AC/DC conversion circuit module 130 through the wire W ₃₁ ; Both ends of each of the coils L ₁₂ , L ₂₂ and L ₃₂ are respectively connected to the wire W ₃₂ through a diode (rectifier diode), and then are commonly connected to the DC output terminal 131 of the AC/DC conversion circuit module 130 through the wire W ₃₂ For example, the two ends of the inductance coil L ₁₂ are respectively connected to the rectifier diodes D ₁₁ and D ₁₂ , the two ends of the inductance coil L ₂₂ are respectively connected to the diodes D ₂₁ and D ₂₂ , and the two ends of the inductance coil L ₃₂ are respectively connected to the diodes D ₃₁ and D ₃₂ ; in this way, the output of the current in different current directions of the inductance coil L ₁₁ , L ₂₁ or L ₃₁ is output through different diodes at the two ends of the inductance coil L ₁₂ , L ₂₂ or L ₃₂ and forms the current output in the same direction , that is to complete the rectification function, and after further filtering by the RC filter circuit in the AC/DC conversion circuit module 130, a DC output is formed at the output terminal 131, so as to finally complete the DC conversion function. Specifically, the RC filter circuit includes a capacitor C ₀ connected across the two ends of the DC output terminal 131 and a resistor R ₀ connected in series to either end of the two ends of the DC output terminal 131 .

It should be understood that the rectification and filtering circuit of the AC/DC conversion circuit module 130 is not limited to the embodiment shown in FIG. can be applied here. For example, the rectification circuit is not limited to the full-wave rectification circuit of the above embodiments, and a full-bridge rectification circuit, a synchronous rectification circuit, etc. are also applicable.

The basic working principle of the hybrid converter 100 according to the embodiment of the present invention will be further described below with reference to FIG. 3 and FIG. 4 .

The hybrid converter 100 of the present utility model can select any one of the DC input 130 as a DC source, taking the DC input 110 ₁ as an example (its DC voltage is V ₀ ) as an example, as shown in Figure 3 and Figure 4, through The conduction of the combination of switch tubes of different inverter units is controlled to form different equivalent circuits.

In the equivalent circuit shown in FIG. 3 , the arrows reflect the current direction and the power flow path; in the case of a small output power, all the switching tubes in the inverter units 122 and 123 are turned off by the control signal, therefore, Only the inverter unit 121 plays the role of inversion. At a certain moment, the switch tubes _S12 and _S13 in the inverter unit 121 are turned on (switch tubes _S11 and _S14 are turned off) through the control signal. The equivalent circuit diagram As shown in Figure 3, at another moment, the switch tubes _S11 and _S14 in the inverter unit 121 can also be turned on (switch tubes _S12 and _S13 are turned off) through the control signal to form a circuit similar to that shown in Figure 3 Equivalent circuit diagram. In the case of low power output, the switch tubes S ₁₂ and S ₁₃ in the equivalent circuit diagram of Fig. 3 bear relatively small voltage stress, in this case, the working principle of the inverter circuit module 120 is the same A bridge inverter circuit works similarly.

In the equivalent circuit diagram shown in Figure 4, the arrows reflect the current direction and the power flow path; if the output power is large, only performing inversion processing through the inverter unit 121 (as shown in Figure 3) will result in an inversion The switch tube S in the transformation unit 121 is subjected to relatively large voltage stress, therefore, the stress requirement on the switch tube S is high. However, the inverter circuit module in the embodiment of the utility model adopts a hybrid structure, and the inverter unit 121 can be operated through a control signal, and the inverter units 122 and 123 also work at the same time, that is, the inverter units 121, 122 and 123 simultaneously Work and output the same power or different power in parallel, and output DC after confluence in the AC/DC conversion circuit module 130 . The equivalent circuit diagram at a certain moment is shown in Figure 4. The switching tubes _S12 and _S13 in the inverter unit 121 are turned on (switching tubes _S11 and _S14 are turned off) through the control signal, and the inverter unit 122 The switches _S21 and _S24 in the inverter unit are turned on (the switches _S22 and _S23 are turned off), the switches _S31 and _S34 in the inverter unit 123 are turned on (the switches _S32 and _S33 are turned off), At this time, the DC bus bars W ₁₁ and W ₁₄ constitute the DC bus bar of the inverter circuit module 120, the voltage V ₀ of the DC input 110 ₁ is biased on the DC bus bars W ₁₁ and W ₁₄ , and the voltage between the DC bus bars W ₁₁ and W ₁₄ The voltage stress of the six switching tubes S connected in series will become 1/3 of the situation in Figure 3, and the voltage drop of the switching tubes will also be reduced, so that a high-voltage conversion system can be formed with switching tubes with lower voltage stress levels. And, the coil output terminals L ₁₁ , L ₂₁ and L ₃₁ of the inverter units 121, 122 and 123 output power in parallel, and the power is aggregated and output in the AC/DC conversion circuit module 130; by controlling the switching tubes of each inverter unit , the output power of the coil output end of each inverter unit can be controlled, that is, the output power of each inverter unit can be controlled, so that the overall DC output power of the parallel converter 100 can also be controlled.

It should be understood that the setting of the number of inverter units in the inverter circuit module 120 is not limited to the above embodiment, and the number of selected inverter units can also be set according to specific conditions, for example, in the above Figure 4, The switches S ₃₁ , S ₃₂ , S ₃₃ and S ₃₄ in the inverter unit 123 can all be turned off, and only the inverter units 121 and 122 work, and the voltage V ₀ of the inverse DC input 110 ₁ is biased at the DC bus W ₁₁ and On W ₁₃ , the voltage stress of the four switching tubes S connected in series between DC bus bars W ₁₁ and W ₁₃ will become 1/2 of the situation in FIG. 3 .

It should also be noted that after the DC input of a single DC power supply 110 is inverted in parallel by multiple inverter units, the output terminals of the multiple coils of the inverter circuit module 120 can output a greater number of levels, compared with Compared with the traditional multi-level inverter circuit, the number of output levels is more, so the THD (Total Harmonic Distortion) characteristic is also reduced accordingly.

It should also be understood that the hybrid converter 100 of the present invention can select at least two or more than two of the three DC inputs 130 as DC sources (not shown in FIGS. 3 and 4 ), and the selected DC inputs The inverter unit corresponding to 130 is enabled to work by the switch tube control signal, even the inverter unit corresponding to the unselected DC input 130 can also be enabled to work by the switch tube control signal, therefore, the hybrid converter 100 can provide Diversified DC power output to meet various power demands.

FIG. 5 is a schematic diagram of the circuit structure of a hybrid converter according to another embodiment of the present invention, and FIG. 6 is a schematic diagram of the structure of the inverter unit in FIG. 5 . In this embodiment, the main difference between the hybrid converter 200 and the hybrid converter 100 of the embodiment shown in FIG. 1 is that the structure of the inverter unit used in the inverter circuit module 220 is different. As shown in Figure 2, the inverter units are full-bridge H-bridge inverter units 121, 122 and 123, and in the embodiment shown in Figure 5 and Figure 6, the inverter units are half-bridge H-bridge inverter units 221, 222 and 223 .

As shown in FIG. 5 and FIG. 6 , two switch tubes S are arranged on one of the main lines of the half-bridge H-bridge inverter unit, and two capacitors C are arranged on the other main line. Respectively, the inverter unit 221 has two switches S ₁₂ and S ₁₄ arranged on the main line W ₂₂ , two capacitors C ₁₁ and C ₁₃ arranged on the main line W ₂₁ , and an inductance coil arranged on the bridge L ₁₁ , capacitor C ₁ is also connected across the DC bus W ₁₁ and W ₁₂ ; the inverter unit 222 has two switch tubes S ₂₂ and S ₂₄ set on the main line W ₂₂ , and two switches S 22 set on the main line W Capacitor C ₂₁ and capacitor C ₂₂ on ₂₁ , the inductance coil L ₂₁ set on the bridge, and capacitor C ₂ are also connected between the DC bus W ₁₂ and W ₁₃ ; the inverter unit 223 has two sets on the main line W ₂₂ The switch tubes S ₃₂ and S ₃₄ on the main line W ₂₁ , the two capacitors C ₃₁ and C ₃₃ on the main line W 21, the inductance coil L ₃₁ on the bridge, and the capacitor C ₃ are also connected across the DC bus W ₁₃ and W Between ₁₄ .

The setting of the same components in the hybrid converter 200 as the hybrid converter 100 will not be described here one by one, and it also has a similar topology, so it also has similar effects and advantages of the hybrid converter 100 .

FIG. 7 is a schematic diagram showing the circuit structure of a hybrid converter according to yet another embodiment of the present invention. Compared with the hybrid converter 100 in the embodiment shown in FIG. 1 , in the hybrid converter 300 in the embodiment shown in FIG. 7 , the inverter in the inverter circuit module 120 can The number of units is reduced, wherein only the inverter units 121 and 122 are provided in the inverter circuit module 120; correspondingly, the corresponding inductance coil L ₃₁ and rectifier diodes D ₃₁ and D ₃₂ are also reduced in the AC/DC conversion circuit module 130 . The setting of the same components in the hybrid converter 300 as the hybrid converter 100 will not be described here one by one, and it also has a similar topology structure, so it also has similar effects and advantages of the hybrid converter 100 .

It should be understood that the number of inverter units in the inverter circuit module 120 is not limited to be equal to or less than the number of DC inputs 110 in the above embodiments, and in other embodiments, the number of DC inputs 110 is also greater than the number of DC inputs 110 The number, for example, can also be set to 4. It will be understood that when there are two inverter units arranged in parallel, and the input end of each inverter unit is correspondingly connected to a DC input 110, the coil output ends of at least two inverter units are arranged as output in parallel, and the two The inverter units arranged in parallel share the DC bus, so that the switching tubes of the two parallel inverter units are connected in series, then a hybrid topology is formed, and therefore, the above hybrid conversion Advantages of device 100.

The hybrid converters of the above embodiments shown in FIG. 1 and FIG. 5 are especially suitable for high-voltage charging applications. The charging of a power battery of a vehicle based on the hybrid converter will be described below as an example.

FIG. 8 is a schematic structural diagram of a charging and swapping facility according to an embodiment of the present invention. The charging and swapping facility 10 may be, but not limited to, a vehicle charging and swapping facility (such as a vehicle charging station) for charging a power battery of a vehicle. It will be understood that the charging and swapping facility 10 may also be various charging stations (not limited to Vehicle charging station), exchange station or energy storage station (such as wind power or solar power storage station), etc. The charging and swapping facility 10 in FIG. 8 exemplarily uses the hybrid converter 100 of the embodiment shown in FIG. The facility 10 includes different types of power input such as a grid 11, a generator 12, and a DC power supply 13; the output corresponding to the grid 11 is alternating current, therefore, the charging and swapping facility 10 is correspondingly provided with an AC/DC converter 11a for converting the grid 11’s AC output is transformed into a DC output and provided to the inverter circuit module 120; the output corresponding to the generator 12 is also AC, therefore, an AC/DC converter 12a is correspondingly provided in the charging and swapping facility 10 for converting the power grid 11 The AC output is converted into a DC output and provided to the inverter circuit module 120. The AC/DC converter 12a may have different models or configurations from the AC/DC converter 11a; The facility 10 is correspondingly provided with a DC/DC converter 13a, which is used to convert a certain voltage DC output of the grid 11 into another voltage DC output and provide it to the inverter circuit module 120. When the output voltage of the DC power supply 13 is suitable Next, the DC/DC converter 13a may be omitted. The DC power of any one or more outputs in the AC/DC converter 11a, the AC/DC converter 12a and the DC/DC converter 13a will be provided to the hybrid converter 100 for DC-AC-DC conversion and then output Terminal 131 outputs direct current. The vehicle 900 can take power from the output terminal 131 of the charging and swapping facility 10 to charge the power battery.

The charging and swapping facility 10 can have multiple different types of power input, and the types of power sources that can be input are not limited to the grid 11, generator 12 and DC power supply 13, which can be specifically configured according to the environmental conditions of the charging and swapping facility. 13 can be a photovoltaic module, or even a power battery of a vehicle (at this time, the charging and swapping facility 10 can enable one electric vehicle to charge another electric vehicle). Therefore, the charging and changing facility 10 can be compatible with various types of power input, and it is easy to solve the limitation of the charging and changing facility 10 on charging in special occasions or special environmental conditions. For example, when the power grid 11 is out of power, the user can choose to connect into the generator 12 for charging, and it is also possible to realize multiple types of power input to simultaneously charge the charged vehicle at high voltage. Charging will be interrupted due to insufficient power. Therefore, the convenience and robustness of charging are greatly improved, the experience of vehicle users is good, and the charging needs of vehicles in various scenarios can be met.

It should be understood that the charging and swapping facility 10 also has the advantages of the hybrid converter 100 when using the hybrid converter 100 of the embodiment shown in FIG. The switch tube is formed, the cost is low, and it has good THD characteristics.

It will be understood that when a component is "connected" or "coupled" to another component herein, it can be directly connected or coupled to the other component or intervening components may be present. In contrast, when a component is said to be "directly coupled" or "directly connected" to another component, there are no intervening components present.

The above examples mainly illustrate the hybrid converter of the present invention and its charging and swapping facilities. Although only some embodiments of the utility model have been described, those skilled in the art should understand that the utility model can be implemented in many other forms without departing from the gist and scope thereof. The examples and implementations shown are therefore to be regarded as illustrative and not restrictive, and the present invention may cover various modification and replacement.

Claims (13)

1. A hybrid converter, which is used to convert a DC input to a DC output, wherein the converter comprises: N DC inputs, wherein N is an integer greater than or equal to 2, and the N DC inputs are sequentially connected in series, and any one of the N DC inputs, or a combination of at least two, is used for hybrid connection The converter provides a DC source; An inverter circuit module, which has at least two inverter units arranged in parallel, wherein the input end of each inverter unit is connected to one of the N DC inputs, and at least two of the inverter units The output ends of the coils are arranged as output in parallel, and the DC bus is shared between the two parallel inverter units, so as to realize the series connection between the switch tubes of the two parallel inverter units; and The AC/DC conversion circuit module is used for rectifying and filtering the AC signals output from the N coil output terminals of the inverter circuit module to form a DC output. 2. The hybrid converter according to claim 1, wherein the inverter circuit module has at least N inverter units arranged in parallel, wherein the input terminals of the N inverter units correspond to each other one by one The N DC inputs are connected, the coil output terminals of the N inverter units are arranged as parallel outputs, and the adjacent inverter units among the N inverter units arranged in parallel share a DC bus , so that the switch tubes of adjacent inverter units are connected in series. 3. The hybrid converter according to claim 2, wherein the first input end and the second input end of the nth DC input are respectively connected to the nth inverter unit in the inverter circuit module a first DC bus and a second DC bus; The first input terminal and the second input terminal of the (n+1)th DC input are respectively connected to the first DC bus and the second DC bus of the (n+1)th inverter unit in the inverter circuit module ; Wherein, the second input terminal of the nth DC input is connected in series with the first input terminal of the (n+1)th DC input, and the second DC bus of the nth DC input is connected to the (n+1)th DC input The first DC bus bar of the DC input is shared; Wherein, n is an integer, 1≤n<N. 4. The parallel-connected converter according to claim 1, wherein the two inverter units have the same configuration. 5. The hybrid converter according to claim 1, wherein the inverter unit is a single-phase or multi-phase full-bridge inverter unit, or a single-phase or multi-phase half-bridge inverter unit. 6. The hybrid converter according to claim 5, wherein the inverter unit is an H bridge inverter unit, and the coil output end of the inverter unit is arranged on the bridge of the H bridge; Wherein, the switch tube on the main line of the H-bridge inverter unit is connected in series with the switch tube on the main line of the adjacent H-bridge inverter unit. 7. The hybrid converter according to claim 1, wherein the AC/DC conversion circuit module has at least two coil input terminals and a DC output terminal, and the two coil input terminals are connected to the two coil input terminals respectively. The coil outputs of the parallel inverter units are coupled. 8. The hybrid converter as claimed in claim 7, characterized in that, the middle part of each inductance coil in at least two said coil input ends is drawn out through a first wire, and then is commonly connected to the said DC output end. first end; Both ends of the inductance coil of each of the at least two coil input ends are respectively connected to the second wire through a rectifier diode, and then are commonly connected to the second end of the DC output end through the second wire. 9. A charging and swapping facility, characterized in that it comprises: A parallel converter as claimed in any one of claims 1 to 8; and N different types of power supply inputs are respectively corresponding to the N DC inputs connected to the hybrid converter. 10. The charging and swapping facility according to claim 9, wherein the power input is connected to the corresponding DC input of the hybrid converter through an AC/DC converter or a DC/DC converter, or directly connected to to the corresponding DC input of the hybrid converter. 11. The charging and swapping facility according to claim 9, wherein the N different types of power inputs include: grids, generators and DC power sources. 12. The charging and swapping facility according to claim 11, wherein the DC power source is a photovoltaic module or a power battery of a vehicle. 13. The charging and swapping facility according to claim 10, wherein the charging and swapping facility is a vehicle charging and swapping facility.