CN102709997A - Method for wirelessly transmitting electric energy to charge a plurality of or many kinds of loads - Google Patents

Abstract

The present invention relates to a method for wirelessly transmitting electric energy to charge multiple or multiple loads at the same time. The high-frequency coil in the special power supply tray generates an alternating electromagnetic field emitted outward; 3. Standardized production of power-taking devices for different types of loads; the standardized load-taking devices include sequentially connected resonant circuits, high-frequency rectifier circuits and DC filters Circuit; 4. Place one or more loads of the same or different types on a dedicated power supply tray without wire connection, and send the electric energy emitted by the high-frequency coil in the dedicated power supply tray to the load for charging through inductive coupling. The method of the present invention is realized through methods such as power conversion, wireless transmission of electric energy, standardization of power-taking devices for different loads, etc., which is convenient, economical and fast, and has a wide range of applications.

Description

Method for charging multiple or multiple loads simultaneously by transmitting electric energy in a wireless manner

technical field

The present invention relates to a charging method, in particular to a method of transmitting electric energy in a wireless manner and simultaneously charging multiple or multiple loads from one power supply.

Background technique

At present, chargers have a wide range of applications and uses in various fields, especially in the fields of production and life, they are widely used in common electrical equipment such as mobile phones and cameras. The existing chargers basically charge electrical equipment through the following two charging methods.

The first is a contact method that directly connects the power supply to the electrical equipment that receives power through metal wires to charge the built-in battery of the electrical equipment. However, since this charging method adopts metal wires to be directly connected, generally speaking, a charger can only charge one electrical device, but cannot charge multiple or multiple electrical devices at the same time.

The second is a wireless charging method, but although the existing wireless charging method does not use wires to connect the power supply and the electrical equipment receiving power, this charging method can only realize charging from one charger to one electrical equipment. It cannot charge multiple devices at the same time, let alone charge multiple devices at the same time.

Contents of the invention

The purpose of the present invention is to provide a method of using wireless transmission of electric energy to charge multiple or multiple loads at the same time, which is realized by power conversion, wireless transmission of electric energy, and standardization of power-taking devices for different loads, which is convenient, economical and quick, and has a wide range of applications .

In order to achieve the above purpose, the technical solution of the present invention is to provide a method for simultaneously charging multiple or multiple loads by using wireless transmission of electric energy, which specifically includes the following steps:

Step 1. Convert AC mains power to high-frequency AC voltage through frequency conversion;

Step 2, the high-frequency AC voltage obtained in step 1 is passed through the high-frequency coil installed in the special power supply tray to generate an outwardly emitted alternating electromagnetic field;

Step 3. Standardized production of power-taking devices for different types of loads; the standardized load-taking devices include a resonant circuit, a high-frequency rectifier circuit and a DC filter circuit connected in sequence;

Step 4. Place one or more loads to be charged of the same or different types on the dedicated power supply tray without wire connection, and send the electric energy emitted by the high-frequency coil in the dedicated power supply tray to the load through inductive coupling for charging.

Described step 1 specifically comprises the following steps:

Step 1.1, AC-DC conversion; pass the AC mains power through the rectifier bridge, and convert it into a DC voltage by using a full-wave or half-wave rectification method;

Step 1.2, high-frequency inverter; the DC voltage obtained in step 1.1 is converted into a high-frequency square-wave AC voltage with a frequency higher than that of the AC mains through a full-bridge inverter circuit;

Step 1.3, filtering; converting the high-frequency square-wave AC voltage obtained in step 1.2 into a high-frequency sinusoidal AC voltage through filtering.

The frequency range of the high frequency square wave AC voltage obtained in the step 1.2 is 10KHz-100KHz.

Described step 2 specifically comprises the following steps:

Step 2.1, making a special power supply tray; the outside of the special power supply tray is made of insulating material, and the upper surface of the special power supply tray for placing the charging load is horizontal;

Step 2.2, high-frequency coil production; the high-frequency coil is installed inside the special power supply tray, which is a coil array, and the coil array is composed of multiple annular metal coils connected in parallel or in series;

Step 2.3, resonant output; the high-frequency coil receives the high-frequency sinusoidal AC voltage obtained in step 1.3 to form an outwardly radiating alternating electromagnetic field.

Described step 3 specifically comprises the following steps:

Step 3.1, the resonant circuit includes an inductance coil, and the inductance coil obtains electric energy from the high-frequency coil in the special power supply tray through inductive coupling, and receives high-frequency AC voltage;

Step 3.2, adjusting the high-frequency AC voltage received by the inductance coil in the resonant circuit to make it meet the charging voltage required by the internal rechargeable battery of different types of loads;

Step 3.3, the high-frequency rectification circuit performs high-frequency rectification on the high-frequency AC voltage adjusted in step 3.2, and converts it into a DC voltage that can charge the internal rechargeable battery of the load;

Step 3.4, the DC filter circuit filters the DC voltage rectified in step 3.3;

Step 3.5. Configure and install the completed standardized load-taking device in various loads as a part of the charging device of the load itself.

In a preferred embodiment of the present invention, in the step 3.2, for different types of loads, the high-frequency AC voltage is adjusted by adjusting the number of turns of the inductance coil to obtain a charging voltage output that meets the requirements of the internal rechargeable battery of the load.

In another preferred embodiment of the present invention, the standardized load power-taking device further includes an AC voltage regulating circuit connected between the resonant circuit and the high-frequency rectification circuit, which is a high-frequency transformer.

In the step 3.2, for different types of loads, the high-frequency AC voltage is regulated by adjusting the high-frequency transformer to obtain a charging voltage output that meets the requirements of the internal rechargeable battery of the load.

The method provided by the present invention to transmit electric energy in a wireless manner to charge multiple or multiple loads at the same time realizes charging multiple or multiple loads at the same time through methods such as power conversion, wireless transmission of electric energy, and standardization of power-taking devices for different loads. Function.

The method provided by the present invention for using wireless transmission of electric energy to simultaneously charge multiple or multiple loads has the following advantages: 1) There is no need to use traditional wired methods (such as plugs and sockets) for electric energy transmission between the load and the power supply, Instead, use a wireless connection. 2) Multiple or multiple different loads can be charged with the same charger at the same time, instead of having a dedicated charger for each load, which is very convenient. 3) This method enables users with many different loads to charge a variety of loads with only a small number or even just one charger, which is extremely economical, and has great development potential and application prospects.

Description of drawings

Fig. 1 is a flow chart of a method for simultaneously charging multiple or multiple loads by wirelessly transmitting electric energy according to the present invention;

Fig. 2 is the structural representation of the full-bridge inverter circuit among the present invention;

Fig. 3 is the waveform diagram of the high-frequency AC voltage produced by the full-bridge inverter circuit shown in Fig. 2;

Fig. 4 is the structural representation of the high-frequency coil resonant circuit in the present invention;

Fig. 5 is a schematic diagram of the circuit structure of the standardized load power-taking device in the present invention.

Detailed ways

A preferred embodiment of the present invention will be described in detail below with reference to FIG. 1 to FIG. 5 .

As shown in FIG. 1 , the present invention provides a method for simultaneously charging multiple or multiple loads by transmitting electric energy in a wireless manner, which specifically includes the following steps.

Step 1. Convert the 220V AC mains into a high-frequency AC voltage through frequency conversion.

Step 1.1, AC-DC (alternating current-direct current) conversion; pass the 220-volt AC mains power through the rectifier bridge, and convert it into a DC voltage by using a full-wave or half-wave rectification method.

Step 1.2, high-frequency inverter; the DC voltage obtained in step 1.1 is converted into a high-frequency square-wave AC voltage with a frequency higher than that of the AC mains using inverter power technology, wherein the frequency range can be tens to hundreds of kilohertz within range.

In this embodiment, the high-frequency inverter circuit structure shown in FIG. 2 is adopted, and the working principle of the high-frequency inverter in step 2 is described in detail by taking the full-bridge inverter circuit as an example. Please refer to Figure 2, where DC represents the DC voltage obtained after rectification and filtering in step 1.1; and the four power switch tubes S1, S2, S3, and S4 form a bridge circuit, where the power switch tubes S1 and S4 form a Yes, the power switch tubes S2 and S3 form a pair.

Firstly, a turn-on signal is applied to the control terminals of the power switch tubes S1 and S4, at this time the power switch tubes S2 and S3 are turned off, and a positive voltage is generated at both ends of the pure resistive load R at this time. After a period of time, a cut-off signal is applied to the control terminals of the power switch tubes S1 and S4 to turn them off; and a conduction signal is applied to the control terminals of the power switch tubes S2 and S3. negative voltage. After continuing for a period of time, apply a cut-off signal to the control terminals of the power switch tubes S2 and S3 to close them; produces a positive voltage. Repeating this cycle, the voltage waveform shown in Figure 3 can be generated at both ends of the pure resistive load R, so the DC voltage DC obtained in step 1.1 is converted into a square wave AC voltage. The frequency of the AC voltage can be determined by the on/off control signals alternately applied to the upper control terminals of the two pairs of power switch tubes. Generally, the frequency is in the range of 10KHz to 100KHz, which is much higher than the frequency of the AC mains. But it is not limited to this range.

Step 1.3, filtering; converting the high-frequency square-wave AC voltage obtained in step 1.2 into a high-frequency sinusoidal AC voltage through filtering.

Step 2. Pass the high-frequency AC voltage obtained in step 1 through the high-frequency coil installed in the special power supply tray to generate an outwardly radiating alternating electromagnetic field.

Step 2.1, making a special power supply tray; the outside of the special power supply tray is made of insulating material, and the upper surface of the special power supply tray for placing the charging load is horizontal, so that not only can it be placed on the special power supply tray at the same time Multiple loads to be charged can also ensure that the high-frequency coils emit in the same direction.

In this embodiment, the exterior of the special power supply tray is made of plastic material, so as to play an insulating role.

Step 2.2, making high-frequency coils; the high-frequency coils are installed inside the special power supply tray, which is a coil array, and the coil array is composed of multiple ring-shaped metal coils connected in parallel or in series. The purpose of the annular metal coils being arranged in an array is to increase the area of the dedicated power supply tray so that multiple loads to be charged can be placed and charged at the same time.

Step 2.3, resonant output; the high-frequency coil receives the high-frequency sinusoidal AC voltage obtained in step 1.3 to form an outwardly radiating alternating electromagnetic field.

The specific resonant principle is illustrated by taking the circuit shown in Fig. 4 as an example. Wherein, u represents the high-frequency sinusoidal AC voltage output after inverter filtering in step 1.3, which forms an alternating electromagnetic field through the high-frequency coil L. If the frequency of the high-frequency sinusoidal AC voltage u is f, the parameters of each circuit component in the circuit in Figure 4 should satisfy the following formula:

。

.

Step 3. Standardize the production of power-taking devices for different types of loads; in order to realize that different types of loads can be charged on a dedicated power supply tray, it is necessary to standardize the structure of the power-taking devices for each load. The standardized load power-taking device includes a resonant circuit, an AC voltage regulating circuit, a high-frequency rectifying circuit and a DC filter circuit connected in sequence.

和电容C₀组成了标准化的负载取电装置中的谐振电路，该谐振电路的各电路元器件参数需满足以下公式： Step 3.1. The inductance coil included in the resonant circuit obtains electric energy from the high-frequency coil in the dedicated power supply tray through inductive coupling, and receives high-frequency AC voltage. As shown in Figure 5, where the inductance coil

and capacitance C ₀ form the resonant circuit in the standardized load power-taking device, and the parameters of each circuit component of the resonant circuit need to satisfy the following formula:

。

.

Step 3.2, the AC voltage regulating circuit adjusts the high-frequency AC voltage received by the inductance coil in the resonant circuit to make it meet the charging voltage required by the internal rechargeable battery of different types of loads. In the present invention, voltage regulation can be performed in the following two different ways.

The first method is to adjust the high-frequency AC voltage through the high-frequency transformer T shown in Figure 5; for different types of loads, when making the power-taking device, set the high-frequency transformer T to meet the internal charging requirements of the load. The charging voltage output required by the battery is applicable to the charging requirements of various loads.

的匝数进行高频交流电压的调节；针对不同种类的负载，在制作其取电装置时，通过调节电感线圈

的匝数，获得满足该负载内部充电电池所要求的充电电压输出，以适用各种不同负载的充电要求。 The second method is that there is no need to specially set up an AC voltage regulation circuit similar to a high-frequency transformer, only by adjusting the inductance coil

The number of turns to adjust the high-frequency AC voltage; for different types of loads, when making the power-taking device, by adjusting the inductance coil

The number of turns, to obtain the charging voltage output that meets the requirements of the internal rechargeable battery of the load, so as to apply to the charging requirements of various loads.

Step 3.3, the high-frequency rectification circuit performs high-frequency rectification on the high-frequency AC voltage regulated in step 3.2, and converts it into a DC voltage capable of charging the internal rechargeable battery of the load. As shown in FIG. 5 , four high-frequency diodes D constitute a high-frequency rectification circuit in a standardized load power-taking device. The high-frequency diode D is a diode with fast turn-on and turn-off capabilities.

Step 3.4, the DC filtering circuit filters the DC voltage rectified in Step 3.3, so as to improve the smoothness of the final output DC voltage, and charge the internal rechargeable battery of the load. As shown in Figure 5, the capacitance connected in parallel to the output terminal of the high-frequency rectification circuit It is a DC filter device.

Step 3.5. Configure and install the completed standardized load-taking device in various loads as a part of the charging device of the load itself.

Step 4. Place one or more loads to be charged of the same or different types on a dedicated power supply tray without wire connection, and send the electric energy in the dedicated power supply tray to the loads for charging through inductive coupling.

The method provided by the present invention to transmit electric energy in a wireless manner to charge multiple or multiple loads at the same time realizes charging multiple or multiple loads at the same time through methods such as power conversion, wireless transmission of electric energy, and standardization of power-taking devices for different loads. Function.

Compared with the prior art, the present invention has the following advantages: 1) It is not necessary to use traditional wired methods (such as plugs and sockets) for power transmission between the load and the power supply, but to use wireless connection. 2) Multiple or multiple different loads can be charged with the same charger at the same time, instead of having a dedicated charger for each load, which is very convenient. 3) This method enables users with many different loads to charge a variety of loads with only a small number or even just one charger, which is extremely economical, and has great development potential and application prospects.

Although the content of the present invention has been described in detail through the above preferred embodiments, it should be understood that the above description should not be considered as limiting the present invention. Various modifications and alterations to the present invention will become apparent to those skilled in the art upon reading the above disclosure. Therefore, the protection scope of the present invention should be defined by the appended claims.

Claims (8)

1. A method for simultaneously charging multiple or multiple loads by transmitting electric energy in a wireless manner, characterized in that, specifically comprising the following steps: Step 1. Convert AC mains power to high-frequency AC voltage through frequency conversion; Step 2, the high-frequency AC voltage obtained in step 1 is passed through the high-frequency coil installed in the special power supply tray to generate an outwardly emitted alternating electromagnetic field; Step 3. Standardized production of power-taking devices for different types of loads; the standardized load-taking devices include a resonant circuit, a high-frequency rectifier circuit and a DC filter circuit connected in sequence; Step 4. Place one or more loads to be charged of the same or different types on the dedicated power supply tray without wire connection, and send the electric energy emitted by the high-frequency coil in the dedicated power supply tray to the load through inductive coupling for charging. 2. The method for simultaneously charging multiple or multiple loads by using wireless transmission of electric energy as claimed in claim 1, wherein the step 1 specifically includes the following steps: Step 1.1, AC-DC conversion; pass the AC mains power through the rectifier bridge, and convert it into a DC voltage by using a full-wave or half-wave rectification method; Step 1.2, high-frequency inverter; the DC voltage obtained in step 1.1 is converted into a high-frequency square-wave AC voltage with a frequency higher than that of the AC mains through a full-bridge inverter circuit; Step 1.3, filtering; converting the high-frequency square-wave AC voltage obtained in step 1.2 into a high-frequency sinusoidal AC voltage through filtering. 3. The method of wirelessly transmitting electric energy to simultaneously charge multiple or multiple loads as claimed in claim 2, wherein the frequency range of the high-frequency square wave AC voltage obtained in step 1.2 is 10KHz to 100KHz . 4. The method for simultaneously charging multiple or multiple loads by transmitting electric energy in a wireless manner as claimed in claim 2, wherein the step 2 specifically includes the following steps: Step 2.1, making a special power supply tray; the outside of the special power supply tray is made of insulating material, and the upper surface of the special power supply tray for placing the charging load is horizontal; Step 2.2, high-frequency coil production; the high-frequency coil is installed inside the special power supply tray, which is a coil array, and the coil array is composed of multiple annular metal coils connected in parallel or in series; Step 2.3, resonant output; the high-frequency coil receives the high-frequency sinusoidal AC voltage obtained in step 1.3 to form an outwardly radiating alternating electromagnetic field. 5. The method for simultaneously charging multiple or multiple loads by transmitting electric energy in a wireless manner as claimed in claim 4, wherein the step 3 specifically includes the following steps: Step 3.1, the resonant circuit includes an inductance coil, and the inductance coil obtains electric energy from the high-frequency coil in the special power supply tray through inductive coupling, and receives high-frequency AC voltage; Step 3.2, adjusting the high-frequency AC voltage received by the inductance coil in the resonant circuit to make it meet the charging voltage required by the internal rechargeable battery of different types of loads; Step 3.3, the high-frequency rectification circuit performs high-frequency rectification on the high-frequency AC voltage adjusted in step 3.2, and converts it into a DC voltage that can charge the internal rechargeable battery of the load; Step 3.4, the DC filter circuit filters the DC voltage rectified in step 3.3; Step 3.5. Configure and install the completed standardized load-taking device in various loads as a part of the charging device of the load itself. 6. The method for transmitting electric energy wirelessly to charge multiple or multiple loads at the same time as claimed in claim 5, characterized in that, in the step 3.2, for different types of loads, by adjusting the number of turns of the inductance coil The high-frequency AC voltage is adjusted to obtain the charging voltage output required by the internal rechargeable battery of the load. 7. The method for using wireless transmission of electric energy as claimed in claim 5 to simultaneously charge multiple or multiple loads, wherein the standardized load power-taking device also includes a circuit connected to the resonant circuit and a high-frequency rectifier The AC voltage regulating circuit between the circuits is a high-frequency transformer. 8. The method of wirelessly transmitting electric energy to charge multiple or multiple loads at the same time as claimed in claim 7, characterized in that, in the step 3.2, for different types of loads, the high-frequency transformer is adjusted to perform high-frequency AC voltage regulation to obtain the charging voltage output required by the internal rechargeable battery of the load.

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