CN217642714U

CN217642714U - Control circuit, motor controller, variable frequency air conditioner, refrigerator and washing machine

Info

Publication number: CN217642714U
Application number: CN202220828846.4U
Authority: CN
Inventors: 郑道富; 孙泉良; 张永庆; 吴晓威
Original assignee: Zhuhai Hengtu Electronic Co ltd
Current assignee: Zhuhai Hengtu Electronic Co ltd
Priority date: 2022-04-12
Filing date: 2022-04-12
Publication date: 2022-10-21
Anticipated expiration: 2032-04-12

Abstract

The embodiment of the application provides a control circuit, a motor controller, a variable frequency air conditioner refrigerator and a washing machine. The control circuit comprises a three-phase rectifying unit, a clamping device and an energy storage unit; the input end of the three-phase rectifying unit can be electrically connected with three-phase alternating current; the first output end of the three-phase rectifying unit is electrically connected with the first end of the clamping device, and the second output end of the three-phase rectifying unit is electrically connected with the second end of the clamping device; the first end of the energy storage unit is electrically connected with the first output end of the three-phase rectifying unit, and the second end of the energy storage unit is electrically connected with the second output end of the three-phase rectifying unit. The control circuit has a surge suppression function.

Description

Control circuit, motor controller, variable frequency air conditioner, refrigerator and washing machine

Technical Field

The utility model relates to a circuit control field, in particular to control circuit, machine controller, variable frequency air conditioner, refrigerator and washing machine that relevant surge restraines.

Background

For some electronic devices in specific environments and applications, the power supply of the electronic devices is often interfered by external transient overvoltage, and these interference sources mainly include: operating overvoltage due to on-off inductive load or on-off high-power load, line fault and the like; lightning surge due to natural phenomena such as lightning. This overvoltage, referred to as a surge voltage, is a transient disturbance. Surge voltages can seriously jeopardize the safe operation of an electronic system. In order to protect electronic equipment using a power supply and prevent the electronic equipment from being damaged by surge voltage, a switching power supply circuit of the electronic equipment needs to be designed to prevent surge.

SUMMERY OF THE UTILITY MODEL

Based on this, the embodiment of the application provides a control circuit, a motor controller, a variable frequency air conditioner, a refrigerator and a washing machine, and the control circuit has a surge suppression function.

In order to achieve the above object, the embodiment of the present invention provides the following technical solutions:

a control circuit comprises a three-phase rectifying unit, a clamping device and an energy storage unit; the input end of the three-phase rectifying unit can be electrically connected with three-phase alternating current; the first output end of the three-phase rectifying unit is electrically connected with the first end of the clamping device, and the second output end of the three-phase rectifying unit is electrically connected with the second end of the clamping device; the first end of the energy storage unit is electrically connected with the first output end of the three-phase rectifying unit, and the second end of the energy storage unit is electrically connected with the second output end of the three-phase rectifying unit. The output end of the three-phase rectifying unit of the control circuit is connected with a clamping device, and the control circuit has a surge suppression function.

The embodiment of the application also provides a motor controller, which comprises the control circuit and the inverter unit; the first end of the inversion unit is electrically connected with the first end of the energy storage unit of the control circuit, and the second end of the inversion unit is electrically connected with the second end of the energy storage unit; the output end of the inversion unit can be electrically connected with the motor. The motor controller is provided with the clamping device, has a surge suppression function and is high in safety.

The embodiment of the application also provides the inverter air conditioner, which comprises the motor controller, wherein the motor controller is used for controlling a compressor or a fan of the inverter air conditioner. The variable frequency air conditioner has a surge suppression function and is high in safety.

The embodiment of the application also provides a refrigerator, which comprises the motor controller, wherein the motor is a refrigerator compressor. The refrigerator has a surge suppression function and is high in safety.

The embodiment of the application also provides a washing machine, which comprises the motor controller, wherein the motor is a washing machine motor. The washing machine has a surge suppression function and high safety.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments or the background art of the present invention, the drawings required to be used in the description of the embodiments or the background art will be briefly introduced below, it is obvious that the drawings in the description below are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.

Fig. 1 is a circuit block diagram of a control circuit according to an embodiment of the present disclosure;

fig. 2 is a schematic circuit diagram of a motor controller according to an embodiment of the present application;

FIG. 3 is a schematic circuit diagram of a motor controller according to another embodiment of the present application;

fig. 4 is a schematic circuit diagram of a motor controller according to another embodiment of the present application.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In this application, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising a … …" does not exclude the presence of another identical element in a process, method, article, or apparatus that comprises the element.

The embodiment of the application provides a control circuit, as shown in fig. 1, including a three-phase rectification unit 200, a clamping device 300, and an energy storage unit 400. The input end of the three-phase rectification unit 200 can be electrically connected to the three-phase alternating current, that is, three input terminals of the three-phase rectification unit 200 can be electrically connected to the R-phase, the S-phase, and the T-phase of the three-phase alternating current, respectively. A first output end of the three-phase rectification unit 200 is electrically connected with a first end of the clamping device 300, and a second output end of the three-phase rectification unit 200 is electrically connected with a second end of the clamping device 300, wherein the first output end of the three-phase rectification unit 200 may be a positive output end of the three-phase rectification unit 200, and the second output end of the three-phase rectification unit 200 may be a negative output end of the three-phase rectification unit 200; when the circuit works, the voltage of the positive output end is higher than that of the negative output end. A first end V + of the energy storage unit 400 is electrically connected with a first output end of the three-phase rectifying unit 200, and a second end V-of the energy storage unit 400 is electrically connected with a second output end of the three-phase rectifying unit 200; the voltage of the first terminal of the energy storage unit 400 is higher than the voltage of the second terminal thereof. Two terminals of the energy storage unit 400 are electrically connected to a load to supply power. The energy storage unit 400 includes a capacitor C1; the capacitor C1 may be a thin film circuit, an electrolytic capacitor, or the like, may be a combination of a plurality of types of capacitors, or may be a combination of a plurality of capacitors, which is not limited in this application.

The clamping device 300 can prevent the back-end bus voltage of the three-phase rectifying unit from being too high, and protect the three-phase rectifying unit and the back-end load thereof from being damaged by overvoltage.

Wherein, the clamping device 300 may be a voltage dependent resistor, a transient diode or a discharge tube; the clamping device 300 may further comprise one or more of a varistor, a transient diode, and a discharge tube; the clamping device may further include a plurality of piezoresistors, a plurality of TVS (Transient Voltage super) transistors, or a plurality of discharge tubes. Taking the clamping device 300 including one voltage dependent resistor RV1 as an example, the operation principle of the above control circuit surge suppression is explained:

when the grid is disturbed, a relatively high voltage may be present at the input power supply. This voltage is passed through a three-phase rectification unit 200 to convert the AC voltage into a DC voltage. Because the output end of the three-phase rectification unit 200 is connected in parallel with a voltage dependent resistor RV1, at this time, the RV1 can clamp the voltage at the two output ends of the three-phase rectification unit 200. Taking the clamping voltage of RV1 as 820V for example, RV1 can clamp the voltages at two output terminals of the three-phase rectification unit 200 to 820V. Meanwhile, the voltage between the input lines of the three-phase rectifying unit can also be clamped to 820V by RV1 (the voltage across the R phase/S phase is clamped by the path D1 → RV1 → D4; the voltage across the S phase/R phase is clamped by the path D3 → RV1 → D2; the voltage across the R phase/T phase is clamped by the path D1 → RV1 → D6; the voltage across the T phase/R phase is clamped by the path D5 → RV1 → D2; the voltage across the S phase/T phase is clamped by the path D3 → RV1 → D6; the voltage across the T phase/S phase is clamped by the path D5 → RV1 → D4; the voltage across the input power line can also be prevented from being too high by the above clamping path.

In this embodiment, by providing the fast-response over-voltage hardware protection circuit, i.e., the clamping device 300, the rectifier bridge and the back-end circuit thereof can be protected from being damaged in time by the response of the hardware protection circuit. And the clamping device 300 is arranged at the rear end of the rectifier bridge, and compared with a plurality of clamping devices arranged between the front-end alternating current side wires of the rectifier bridge, the number of the clamping devices can be reduced, so that the PCB layout is simplified, the board distribution space can be saved, and the cost can be reduced.

Further, as shown in fig. 3, in one embodiment, the apparatus further includes a filtering unit 100; the three-phase rectifying unit 200 can be electrically connected to the three-phase alternating current at least through the filtering unit 100. The input voltage is filtered by the filter circuit 100 and then rectified by the three-phase rectifying unit 200.

Further, in addition to the clamping device 300 provided behind the three-phase rectification unit 200, a clamping device such as a varistor, a TVS tube, a discharge tube, etc. is provided in front of the three-phase rectification unit 200. Specifically, as shown in fig. 4, the control circuit further includes a pre-bridge surge suppression unit 600, where the pre-bridge surge suppression unit 600 includes a first voltage dependent resistor RV5, a second voltage dependent resistor RV6, and a third voltage dependent resistor RV7, and the first voltage dependent resistor RV5, the second voltage dependent resistor RV6, and the third voltage dependent resistor RV7 are respectively connected between the phases of the three-phase power before the three-phase rectification unit 200; for example, the R phase/S phase/T phase of the input power is filtered by the filtering unit 100 and then labeled as R1/S1/T1 phase, the first varistor RV5 is connected between the R1 phase and the S1 phase, the second varistor RV6 is connected between the S1 phase and the T1 phase, and the third varistor RV7 is connected between the R1 phase and the T1 phase.

In the embodiment, for voltage protection between three-phase line wires, a voltage dependent resistor is connected in parallel between the wires, so that the line voltage is clamped within voltage dependent clamping voltage, such as RV5, RV6, and RV7 in fig. 4. The input end of the three-phase power supply is connected with a voltage clamping device in parallel, such as a transient voltage suppression diode, a piezoresistor, a solid discharge tube and the like; when the power supply voltage fluctuation is below the action voltage (clamping voltage) of the clamping device, the clamping device is equivalent to an open circuit, the normal work of the switching power supply is not influenced, when the power supply is in surge, the surge voltage is higher than the action voltage of the clamping device, the clamping device is quickly conducted, the power supply voltage is limited in a safety range, and the effect of protecting the electric equipment is achieved. In one embodiment, the clamping voltages of the piezoresistors RV5, RV6 and RV7 are the same, and the clamping voltage of the clamping device 300 is also the same as the clamping voltage of the piezoresistors RV5/RV6/RV 7; if the clamping device 300 includes the voltage dependent resistor RV1, the clamping voltage of the voltage dependent resistor RV1 is equal to the clamping voltage of the voltage dependent resistors RV5, RV6, RV7. In this embodiment, the voltage dependent resistors RV5, RV6, and RV7 connected in parallel are connected to the input end of the three-phase power supply, that is, the front end of the rectifier bridge, so that when surge voltage occurs on the input power supply side, the voltage dependent resistors RV5, RV6, and RV7 can clamp the line voltage between the phases; after the line voltage passes through the rectifier bridge, the bus voltage at the output end of the rectifier bridge is greater than the line voltage, and the bus voltage at the rear end of the rectifier bridge may also reach a larger peak voltage, so that certain risks are generated on the reliability of the product. In this embodiment, the clamp device 300 after the bridge is provided, so that the bus voltage can be clamped and limited, and the post-stage circuit can be protected.

Further, in one embodiment, the clamping device 300 includes 2 or more of the piezoresistors, and 2 or more of the piezoresistors are connected in parallel.

Based on the control circuit, an embodiment of the present application further provides a motor controller, which includes any one of the control circuits and the inverter unit 500 described in the foregoing embodiments, specifically, as shown in fig. 2 to 4, a first end of the inverter unit 500 is electrically connected to a first end of the energy storage unit 400 of the control circuit, and a second end of the inverter unit 500 is electrically connected to a second end of the energy storage unit 400; the output end of the inverter unit 500 can be electrically connected to the motor M. The motor controller has an anti-surge design corresponding to the control circuit, and is high in safety.

Based on the above motor controller, an embodiment of the present application further provides an inverter air conditioner, including the motor controller provided by the above embodiment, the motor M is an air conditioner compressor or an air conditioner fan. Another embodiment of the present application further provides a refrigerator, including the motor controller provided in the above embodiment, and the motor M is a refrigerator compressor. Another embodiment of the present application further provides a washing machine, including the motor controller provided in the above embodiment, and the motor M is a washing machine motor. The variable frequency air conditioner, the refrigerator or the washing machine provided by the embodiment of the application have anti-surge design and high safety.

The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, the system or system embodiments are substantially similar to the method embodiments and therefore are described in a relatively simple manner, and reference may be made to some of the descriptions of the method embodiments for related points. The above-described system and system embodiments are only illustrative, wherein the units described as separate parts may or may not be physically separate, and the parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A control circuit is characterized by comprising a three-phase rectifying unit, a clamping device and an energy storage unit; the input end of the three-phase rectifying unit can be electrically connected with three-phase alternating current; the first output end of the three-phase rectifying unit is electrically connected with the first end of the clamping device, and the second output end of the three-phase rectifying unit is electrically connected with the second end of the clamping device; the first end of the energy storage unit is electrically connected with the first output end of the three-phase rectification unit, and the second end of the energy storage unit is electrically connected with the second output end of the three-phase rectification unit.

2. The control circuit of claim 1, further comprising a filtering unit; the three-phase rectifying unit can be electrically connected with the three-phase alternating current at least through the filtering unit.

3. The control circuit according to claim 2, further comprising a first voltage dependent resistor RV5, a second voltage dependent resistor RV6 and a third voltage dependent resistor RV7, the first voltage dependent resistor, the second voltage dependent resistor and the third voltage dependent resistor being respectively connected between the phase phases of the three-phase power before the three-phase rectification unit.

4. The control circuit of any of claims 1-3, wherein the clamping device comprises a varistor, a transient diode, or a discharge tube;

alternatively, the clamping device comprises 2 or more of the piezoresistors, and the 2 or more of the piezoresistors are connected in parallel.

5. The control circuit according to claim 3, wherein the clamping device comprises a piezoresistor RV1, the clamping voltage of the first piezoresistor RV5, the clamping voltage of the second piezoresistor RV6 and the clamping voltage of the third piezoresistor RV7 are equal, and the clamping voltage of the piezoresistor RV1 is equal to the clamping voltage of the first piezoresistor RV 5.

6. The control circuit of claim 1, wherein the energy storage unit comprises a capacitor.

7. A motor controller comprising a control circuit according to any one of claims 1 to 6 and an inverter unit; the first end of the inversion unit is electrically connected with the first end of the energy storage unit of the control circuit, and the second end of the inversion unit is electrically connected with the second end of the energy storage unit; the output end of the inversion unit can be electrically connected with the motor.

8. An inverter air conditioner, characterized by comprising the motor controller according to claim 7, wherein the motor is an inverter air conditioner compressor or a fan.

9. A refrigerator comprising a motor controller according to claim 7, wherein the motor is a refrigerator compressor.

10. A washing machine comprising a motor controller as claimed in claim 7, the motor being a washing machine motor.