WO2020253047A1 - Machine operation circuit, and vacuum cleaner comprising same - Google Patents

Abstract

A machine operation circuit, and a vacuum cleaner comprising same. The machine operation circuit comprises a power supply. The power supply comprises a power supply protection circuit for turning off the power supply according to a power supply operation parameter and a signal output port for outputting the power supply operation parameter. The machine operation circuit further comprises: a load (40), powered by the power supply; and a drive protection circuit (20), the drive protection circuit (20) comprising a signal acquisition port (10) connected to the signal output port and used to receive the power supply operation parameter, the drive protection circuit (20) being electrically connected between the power supply and the load (40), in which the drive protection circuit (20) disconnects the electrical connection between the power supply and the load (40) according to the power supply operation parameter received from the signal acquisition port (10). The signal acquisition port (10) of the machine operation circuit is directly connected to the signal output port of the power supply so as to acquire the power supply operation parameter, and control the load (40). The invention eliminates the need to additionally provide a detection apparatus, has a simple structure, and is low-cost.

Description

Machine working circuit and vacuum cleaner including it Technical field

The utility model provides a machine working circuit, in particular to a machine working circuit that can directly obtain power supply working parameters and a vacuum cleaner including the machine working circuit.

Background technique

Normally, the load must be connected to the battery to make the load work. Household appliances such as vacuum cleaners and lawn mowers all require motors, and the motors are usually powered by batteries.

In the current production environment, manufacturers of machines usually no longer produce batteries separately, but instead purchase suitable batteries that meet the conditions of the machine on the market. After the battery is purchased, in order to keep the battery and the machine working normally, it is usually necessary to make a separate current, voltage, and temperature protection device for the battery. At the same time, it is also necessary to design a separate protection device inside the vacuum cleaner to achieve double protection. However, the cost of this protection method is relatively high, and the process is also relatively complicated.

Therefore, it is necessary to design a low-cost machine working circuit and a vacuum cleaner that can protect the battery and the load.

Utility model content

In order to solve the above problems, the present invention proposes a machine working circuit, which includes a power supply, the power supply includes a power protection circuit that shuts off the power supply according to the power supply working parameters, and a signal output port for outputting the power supply working parameters. The working circuit further includes: a load, the load is powered by the power supply; a drive protection circuit, the drive protection circuit includes a signal acquisition port connected to the signal output port and used to receive power supply operating parameters, and the drive protection The circuit is electrically connected between the power supply and the load and disconnects the electrical connection between the power supply and the load according to the power supply operating parameters received from the signal acquisition port.

As a further improvement of the present invention, the drive protection circuit includes a first switch, the input and output ends of the first switch are connected between the negative port of the power supply and the load, and the control end of the first switch is connected to the signal The port is acquired to control the on and off of the first switch.

As a further improvement of the present invention, the machine working circuit further includes a first power terminal connected to the positive terminal of the power supply, and the drive protection circuit further includes a second switch whose control terminal is connected to the signal acquisition port. The input terminal is connected to the first power source terminal, the output terminal is connected to the power source negative terminal through the first resistor, and the control terminal of the first switch is connected to the output terminal of the second switch.

As a further improvement of the present invention, the drive protection circuit further includes a third switch and a fourth switch connected between the first switch and the second switch, and the control terminals of the third switch and the fourth switch are connected to the The output terminal of the second switch; the input terminal of the third switch is connected to the first power terminal, the output terminal is connected to the input terminal of the fourth switch, and the output terminal of the fourth switch is connected to the negative terminal of the power supply; the control terminal of the first switch is connected To between the output terminal of the third switch and the input terminal of the fourth switch.

As a further improvement of the present invention, the drive protection circuit further includes a second resistor and a third resistor, the second resistor and the third resistor are connected in series, one end is connected to the negative port of the power supply, and the other end is connected to the third switch and Between the fourth switch; the control terminal of the first switch is connected between the second resistor and the third resistor.

As a further improvement of the present invention, the machine working circuit further includes a low power consumption protection unit, the low power consumption protection unit includes a fifth switch and a voltage detection unit for detecting the power of the power supply, the input of the fifth switch The terminal is connected to the positive terminal of the power supply, and the output terminal is connected to the first power terminal; the voltage detection part is connected to the control terminal of the fifth switch to control the on and off of the fifth switch.

As a further improvement of the present invention, the voltage detection unit includes a switch module and a voltage dividing module, the output terminal of the switch module is connected to the control terminal of the fifth switch, and the control terminal of the switch module is connected to the voltage dividing module. connection.

As a further improvement of the present invention, the voltage divider module includes a first reference resistor connected between the control terminal and the first power terminal of the switch module, and a second reference resistor connected between the control terminal and the input terminal of the switch module A resistor, a third reference resistor, and a sixth switch; the control terminal and input terminal of the sixth switch are both connected to the positive terminal of the power supply, and the output terminal is connected to the third reference resistor; the other end of the third reference resistor is connected to the Between a reference resistance and a second reference resistance; the third reference resistance is less than the second reference resistance, and the second reference resistance is less than the first reference resistance.

As a further improvement of the present invention, the machine working circuit further includes a second power terminal connected to the positive terminal of the power supply, and the load is connected to the second power terminal; the machine working circuit further includes a fuse connected to Between the positive terminal of the power supply and the second power supply terminal.

The utility model proposes a vacuum cleaner including the above-mentioned machine working circuit.

The beneficial effect of the utility model: In the utility model, the signal of the power protection circuit set inside the power supply is used to realize the protection and control of the load, that is, the signal acquisition port of the working circuit of the machine is directly connected to the signal output port of the power supply to obtain Power supply operating parameters, and then cooperate with the drive protection circuit to protect and control the load. Therefore, there is no need to set up another detection device inside the machine to detect the load working parameters, and the load working can be directly protected, the structure is simpler and the cost is lower.

Description of the drawings

Figure 1 is a schematic diagram of the working circuit of the machine of the present invention.

Detailed ways

In order to enable those skilled in the art to better understand the technical solutions of the present invention, the technical solutions in the embodiments of the present invention will be described clearly and completely in conjunction with the drawings in the embodiments of the present invention. Obviously, The described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the scope of protection of the present utility model.

In addition, repeated reference numbers or labels may be used in different embodiments. These repetitions are only used to describe the present invention simply and clearly, and do not represent any correlation between the different embodiments or structures discussed.

As shown in FIG. 1, the present invention provides a machine working circuit, which is connected between a power source and a load 40. Generally, the load 40 is a motor, etc. General household appliances such as vacuum cleaners, lawn mowers, etc. all require a power supply to power the motor to make the motor work.

The machine working circuit includes:

A machine working circuit, which includes:

A power supply, the power supply includes a power protection circuit that turns off the power supply according to power supply operating parameters, and a signal output port for outputting power supply operating parameters;

Load, the load is powered by the power supply;

Drive protection circuit, the drive protection circuit includes a signal acquisition port connected to the signal output port and used to receive power supply operating parameters, and the drive protection circuit is electrically connected between the power supply and the load and according to the signal acquisition port received Power supply operating parameters and disconnect the electrical connection between the power supply and the load.

In the present invention, the signal acquisition port of the working circuit of the machine is directly connected with the signal output port of the power supply to obtain the power supply operating parameters, and then cooperates with the drive protection circuit to control the load. Therefore, there is no need to additionally set a detection device to detect the load working parameters of the load, and the load working can be directly protected, the structure is simpler and the cost is lower.

In this embodiment, it should be noted that the power supply operating parameter is specifically a parameter signal output by detecting the voltage, current, temperature, etc. of the power supply. Specifically, the power supply operating parameters may be expressed as a power supply undervoltage protection signal and a temperature protection signal. The power supply protection circuit is arranged in the power supply and protects the power supply. In this embodiment, the power supply is a battery, and the battery is usually equipped with a power supply protection circuit to protect the battery from overcurrent, etc. The reason is damaged.

In addition, under-voltage protection means that if the internal circuit of the machine has a short-circuit fault or other reasons, the line voltage will be greatly reduced or even disappear in a short time, which will cause great damage to the line and load 40, and even more Will burn load 40. When the line voltage is restored, if a large number of loads 40 are started at the same time, the voltage will drop significantly, which will cause harm to the line and the load 40. Therefore, the line voltage that causes the load 40 to collapse is called the critical voltage, and when the line voltage reaches the critical voltage, the power supply will generate an undervoltage protection signal. The power supply monitors the voltage of its cell and the current of the charging and discharging circuit to output an undervoltage protection signal.

Temperature protection refers to monitoring the temperature of the power supply. As the power supply continues to supply power, the temperature will rise, but if the power supply temperature is too high, it will affect the internal resistance of the power supply, etc., and also make the circuit and power supply unable to work safely. Therefore, the temperature that causes the power supply to fail to work normally is called the critical temperature. When the temperature of the power supply rises to the critical temperature, the power supply will output a temperature protection signal.

As shown in FIG. 1, the drive protection circuit 20 includes a first switch K1. The input and output ends of the first switch K1 are connected between the negative terminal of the power supply and the load 40. The control terminal of the first switch K1 It is connected to the signal acquisition port 10 to receive power supply operating parameters and control the on and off of the first switch K1.

Therefore, in this embodiment, when the power supply operating parameters received by the control terminal of the first switch K1 are normal, the first switch K1 remains connected and the load 40 also remains connected; the control of the first switch K1 When the power supply operating parameters received by the terminal are abnormal, the first switch K1 is turned off, and the load 40 is powered off to protect the load 40. Therefore, in this embodiment, the first switch K1 is used as the main controller, and as shown in FIG. 1, the first switch K1 is a mos tube. Of course, if the first switch K1 is a triode or other structure, as long as it can receive the power supply operating parameters and make the first switch K1 open or close, the objective of the present invention can also be achieved.

Further, in order to make the on-off of the first switch K1 more stable and better adapt the power supply operating parameters, the control terminal of the first switch K1 is not directly connected to the signal acquisition port 10, and the drive protection circuit 20 also includes a second switch K2, and the control terminal of the first switch K1 is connected to the signal acquisition port 10 through the second switch K2. Specifically, the machine working circuit further includes a first power terminal V1 connected to the positive power supply port V+, the control terminal of the second switch K2 is connected to the signal acquisition port 10, and the input terminal is connected to the first power terminal V1, The output terminal is connected to the negative terminal of the power supply through the first resistor R1, that is, grounded, and the control terminal of the first switch K1 is connected to the output terminal of the second switch K2. Specifically, in this embodiment, the first power supply terminal V1 is also not directly connected to the positive power supply terminal V+, which will be described in detail later.

Therefore, in this embodiment, when the signal acquisition port 10 receives the power supply operating parameters normally, the second switch K2 is connected, so that a current flows through the first resistor R1, and the control terminal of the first switch K1 is due to It is connected to the output terminal of the second switch K2, so there is a voltage input at the control terminal of the first switch K1, so the first switch K1 is also connected. When the signal acquisition port 10 receives an abnormal power supply operating parameter, the second switch K2 is turned off, so the first switch K1 is also turned off, and the load 40 is also turned off. In addition, in this embodiment, the second switch K2 is a triode. Of course, if the second switch K2 is a mos tube or the like, the objective of the present invention can also be achieved.

Further, in order to make the entire drive protection circuit 20 more stable, the first switch K1 and the second switch K2 are not directly connected. The drive protection circuit 20 further includes a third switch K3 and a fourth switch K4. The three switch K3 and the fourth switch K4 are connected between the first switch K1 and the second switch K2. The control terminals of the third switch K3 and the fourth switch K4 are connected to the output terminal of the second switch K2, the input terminal of the third switch K3 is connected to the first power terminal V1, and the output terminal is connected to the input terminal of the fourth switch K4 , The output terminal of the fourth switch K4 is connected to the negative terminal of the power supply. The control terminal of the first switch K1 is connected between the output terminal of the third switch K3 and the input terminal of the fourth switch K4. In this embodiment, the third switch K3 and the fourth switch K4 are also triodes. If they are MOS tubes, the objective of the present invention can be achieved.

As mentioned above, the output terminal of the second switch K2 is connected to the first resistor R1, so the control terminals of the third switch K3 and the fourth switch K4 are also connected to the first resistor R1, and are connected to the first resistor R1. After a switch K1 is turned on, the voltage of the first resistor R1 is applied to the control terminals of the third switch K3 and the fourth switch K4, so the third switch K3 and the fourth switch K4 are also turned on, and the control terminal of the first switch K1 It is connected between the third switch K3 and the fourth switch K4, so a voltage is also applied to the first switch K1, so that the first switch K1 is turned on.

In this embodiment, the drive protection circuit 20 further includes a second resistor R2 and a third resistor R3. The second resistor R2 and the third resistor R3 are connected in series with one end connected to the negative terminal of the power supply and the other end connected to the Between the third switch K3 and the fourth switch K4. The control terminal of the first switch K1 is connected between the second resistor R2 and the third resistor R3. Therefore, in order to further control the on and off of the first switch K1 and make the control more accurate and stable, the second resistor R2 and the third resistor R3 are used for voltage division in this embodiment, so that the first switch K1 can be in a suitable voltage range. In internal conduction, the power supply operating parameters can achieve more precise control of the first switch K1.

Therefore, in the present invention, the drive protection circuit 20 of the machine working circuit can directly obtain the power supply operating parameters received by the signal acquisition port 10, so as to perform on-off control of the first switch K1, so that the power supply is sending out the power supply operating parameters. After that, the load 40 can be disconnected, thereby protecting the load 40. And, specifically, in this embodiment, a second switch K2 and a first resistor R1 are further provided, and a third switch K3, a fourth switch K4, a second resistor R2, and a third resistor R3 are further provided to increase the power supply. The operating parameters control the accuracy of the first switch K1 and directly control the on-off of the load.

As shown in FIG. 1, the machine working circuit of the present invention further includes a low power consumption protection unit 30, which is connected to the above-mentioned drive protection circuit 20 and has priority over the drive protection circuit 20 for control. Specifically, the low power consumption protection unit 30 includes a fifth switch K5 and a voltage detection unit for detecting the power of the power supply. The input end of the fifth switch K5 is connected to the positive power port of the power supply, and the output end is connected to the first power supply. The power terminal V1 and the control terminal are connected to the voltage detection part. In this embodiment, the fifth switch K5 is also a triode, if it is a MOS tube, etc., the purpose of the present invention can also be achieved.

When the voltage detection unit detects that the power of the power supply is low and is in a low voltage state, the fifth switch K5 is turned off; when the voltage detection unit detects that the power supply is in a normal working state, the fifth switch K5 is turned on. Therefore, the low power consumption protection unit 30 receives the power supply power signal obtained by the detection of the voltage detection unit, and the fifth switch K5 is turned off when the power supply power is insufficient, so that the first power supply terminal V1 is also de-energized, and the drive protection circuit 20 also When the power is cut off directly, the first switch K1 is cut off, and the load 40 is also cut off. Therefore, after the load 40 is shut down due to insufficient power of the power supply, it is prevented that the power supply continues to discharge and the battery core is over-discharged.

Further, the voltage detection unit includes a switch module KN and a voltage dividing module. The output terminal of the switch module KN is connected to the control terminal of the fifth switch K5, and the control terminal of the switch module KN is connected to the voltage dividing module. . The voltage dividing module is used to change the voltage of the control terminal of the switch module KN, and thereby control the on and off of the switch module KN.

Specifically, in this embodiment, the voltage dividing module includes a first reference resistor RS1 connected between the control terminal of the switch module KN and the first power terminal V1, and one of the control terminal and the input terminal connected to the switch module KN. The second reference resistor RS2, the third reference resistor RS3 and the sixth switch K6 between the two; the control terminal and the input terminal of the sixth switch K6 are connected to the positive terminal of the power supply, and the output terminal is connected to the third reference resistor RS3; The other end of the third reference resistor RS3 is connected between the first reference resistor RS1 and the second reference resistor RS2. In this embodiment, the sixth switch K6 is also a triode, if it is a MOS tube, etc., the purpose of the present invention can also be achieved.

Therefore, when the voltage at the positive terminal V+ of the power supply is still high, the sixth switch K6 is turned on, and the voltage at the control terminal of the switch module KN is the divided voltage of the second reference resistor RS2, so that the switch module KN is turned on. On, the fifth switch K5 is also on. At the same time, current also flows through the first reference resistor RS1. When the voltage of the positive terminal V+ of the power supply is low, the sixth switch K6 is turned off, and the voltage at the control terminal of the switch module KN is still the divided voltage of the second reference resistor RS2, but due to the sixth switch K6 When disconnected, the divided voltage on the second reference resistor RS2 changes, causing the fifth switch K5 to be disconnected. Thus, the above-mentioned low power consumption protection function can be achieved.

Specifically, the third reference resistance RS3 is smaller than the second reference resistance RS2, and the second reference resistance RS2 is smaller than the first reference resistance RS1. Therefore, as described above, when the voltage at the positive terminal V+ of the power supply is large, so that the sixth switch K6 is turned on, current flows through the third reference resistor RS3 and the second reference resistor RS2; due to the resistance of the second reference resistor RS2 It is larger than the third reference resistor RS3, so the divided voltage on the second reference resistor RS2 is larger, so that the switch module KN is turned on. Moreover, even after the fifth switch K5 is turned on, current flows through the first reference resistor RS1, which is equivalent to the parallel connection of the first reference resistor RS1 and the third reference resistor RS3, and the resistance of the first reference resistor RS1 is the largest. It will affect the voltage division of the second reference resistor RS2 too much.

When the voltage of the positive terminal V+ of the power supply is small, the sixth switch K6 is turned off, the third reference resistor RS3 is not connected to the circuit, and current flows through the first reference resistor RS1 and the second reference resistor RS2. At this time, the voltage of the control terminal of the switch module KN is still the voltage of the second reference resistor RS2. However, the resistance of the first reference resistor RS1 is much greater than that of the second reference resistor RS2, so that the voltage on the second reference resistor RS2 is small, which is not enough to turn on the switch module KN, so that the fifth switch K5 is also turned off.

Therefore, in the present invention, the fifth switch K5 and the voltage detection unit cooperate to protect the power supply and the load 40 from low power consumption to prevent the power supply from being too low but still being discharged. In addition, the voltage detection unit can accurately measure the voltage of the positive terminal V+ of the power supply through the cooperation of the switch module KN and the voltage divider module. Moreover, in this embodiment, the switch module KN uses a reference voltage chip. If the switch module KN uses other circuit structures, the purpose of the present invention can also be achieved.

In addition, the machine working circuit of the present invention also includes a second power terminal V2 connected to the positive terminal V+ of the power supply. The input terminal of the fifth switch K5 and the control terminal of the sixth switch K6, that is, the input terminal, are both connected to the second Power terminal V2. The two ends of the load 40 are respectively connected to the second power terminal V2 and the power negative terminal, and the first power terminal V1 is connected to the power positive terminal V+ through the second power terminal V2. The machine working circuit of the present invention also includes a fuse F1, which is connected between the positive terminal V+ of the power supply and the second power terminal V2. In order to prevent the load 40 from being blocked by the fuse F1, if the torque is still output when the speed of the load 40 is 0, the current is extremely large, so that the fuse F1 is disconnected to further protect the load 40 and the power supply.

Therefore, in the machine working circuit of the present invention, the control of the fuse F1 takes priority over the drive protection circuit 20 and the low power consumption protection unit 30. After the fuse F1 is disconnected, neither the drive protection circuit 20 nor the low power consumption protection unit 30 work, and the load 40 is disconnected. After the fuse F1 is not turned off and the fifth switch K5 of the low power consumption protection unit 30 is turned off, the drive protection circuit 20 does not work anymore, and the load 40 is turned off. When the fuse F1 is not disconnected and the low power consumption protection unit 30 is working normally, the drive protection circuit 20 receives the power supply operating parameters and turns off the first switch K1 when the voltage is abnormal or the temperature is abnormal, so that the load 40 is disconnected.

It should be noted that, as shown in Figure 1, the machine working circuit of the present invention also includes a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, a first diode D1, and a second resistor. The two diodes D2, the third diode D3, the first capacitor C1 and other devices have a relatively low effect on the implementation of the structure of the circuit, so their connection methods and functions will not be repeated.

Therefore, in summary, the present invention provides a machine working circuit, the machine working circuit mainly includes a drive protection circuit 20, and the drive protection circuit 20 can directly receive power supply operating parameters through the signal acquisition port 10. Control, so that the power supply can be under-voltage protection and temperature protection; and directly obtain the power supply operating parameters, and then cooperate with the drive protection circuit 20 to control the load 40, that is, there is no need to separately detect the power supply operating parameters , The structure is simpler and the cost is lower; secondly, the machine working circuit also includes a low-power protection section 30, which can disconnect the load 40 when the power is too low to achieve low-power protection; finally, the machine working circuit also includes There is a fuse F1, which can realize the blocking protection of the power supply and load 40.

It should be understood that although this specification is described in accordance with the embodiments, not each embodiment only contains an independent technical solution. This narration in the specification is only for clarity, and those skilled in the art should regard the specification as a whole. The technical solutions in the embodiments can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

The series of detailed descriptions listed above are only specific descriptions of feasible embodiments of the present utility model, and are not intended to limit the scope of protection of the present utility model. Any equivalent implementations made without departing from the technical spirit of the present utility model Examples or changes should be included in the scope of protection of the utility model.

Claims (10)

A machine working circuit, comprising a power supply, the power supply comprising a power protection circuit for turning off the power supply according to power supply working parameters and a signal output port for outputting the power supply working parameters, characterized in that the machine working circuit further comprises: Load, the load is powered by the power supply; Drive protection circuit, the drive protection circuit includes a signal acquisition port connected to the signal output port and used to receive power supply operating parameters, and the drive protection circuit is electrically connected between the power supply and the load and according to the signal acquisition port received Power supply operating parameters and disconnect the electrical connection between the power supply and the load. The machine working circuit according to claim 1, wherein the drive protection circuit comprises a first switch, the input and output of the first switch are connected between the negative port of the power supply and the load, and the first The control terminal of the switch is connected to the signal acquisition port to control the on-off of the first switch. The machine working circuit according to claim 2, wherein the machine working circuit further comprises a first power terminal connected to the positive terminal of the power source, the drive protection circuit further comprises a second switch, The control terminal is connected to the signal acquisition port, the input terminal is connected to the first power terminal, the output terminal is connected to the power negative terminal through the first resistor, and the control terminal of the first switch is connected to the output terminal of the second switch. The machine working circuit according to claim 3, wherein the drive protection circuit further comprises a third switch and a fourth switch connected between the first switch and the second switch, the third switch and the fourth switch The control terminal of the switch is connected to the output terminal of the second switch; the input terminal of the third switch is connected to the first power terminal, the output terminal is connected to the input terminal of the fourth switch, and the output terminal of the fourth switch is connected to the negative terminal of the power supply; The control terminal of the first switch is connected between the output terminal of the third switch and the input terminal of the fourth switch. The machine working circuit according to claim 4, wherein the drive protection circuit further comprises a second resistor and a third resistor, the second resistor and the third resistor are connected in series with one end connected to the negative port of the power supply, and the other One end is connected between the third switch and the fourth switch; the control end of the first switch is connected between the second resistor and the third resistor. The machine working circuit of claim 3, wherein the machine working circuit further comprises a low power consumption protection part, the low power consumption protection part comprises a fifth switch and a voltage detection part for detecting the power of the power supply, The input terminal of the fifth switch is connected to the positive terminal of the power supply, and the output terminal is connected to the first power terminal; the voltage detection unit is connected to the control terminal of the fifth switch to control the on and off of the fifth switch. The machine working circuit according to claim 6, wherein the voltage detection unit includes a switch module and a voltage divider module, the output terminal of the switch module is connected to the control terminal of the fifth switch, and the switch module The control terminal is connected with the voltage divider module. The machine working circuit according to claim 7, wherein the voltage divider module includes a first reference resistor connected between the control terminal of the switch module and the first power terminal, the control terminal connected to the switch module, and the input The second reference resistor, the third reference resistor and the sixth switch between the terminals; the control terminal and the input terminal of the sixth switch are both connected to the positive terminal of the power supply, and the output terminal is connected to the third reference resistor; the third reference The other end of the resistor is connected between the first reference resistor and the second reference resistor; the third reference resistor is smaller than the second reference resistor, and the second reference resistor is smaller than the first reference resistor. The machine working circuit of claim 1, wherein the machine working circuit further comprises a second power terminal connected to the positive terminal of the power supply, and the load is connected to the second power terminal; the machine working circuit further comprises The fuse is connected between the positive terminal of the power supply and the second power supply terminal. A vacuum cleaner comprising the machine working circuit of any one of claims 1-9.

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