CN114389514A - Surge protection circuit, motor controller and household electrical appliance - Google Patents

Surge protection circuit, motor controller and household electrical appliance Download PDF

Info

Publication number
CN114389514A
CN114389514A CN202210062286.0A CN202210062286A CN114389514A CN 114389514 A CN114389514 A CN 114389514A CN 202210062286 A CN202210062286 A CN 202210062286A CN 114389514 A CN114389514 A CN 114389514A
Authority
CN
China
Prior art keywords
electrolytic capacitor
rectifier bridge
motor controller
circuit
surge protection
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202210062286.0A
Other languages
Chinese (zh)
Inventor
葛森
陈辉
付俊永
赵小安
秦向南
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Midea Welling Motor Technology Shanghai Co Ltd
Original Assignee
Midea Welling Motor Technology Shanghai Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Midea Welling Motor Technology Shanghai Co Ltd filed Critical Midea Welling Motor Technology Shanghai Co Ltd
Priority to CN202210062286.0A priority Critical patent/CN114389514A/en
Publication of CN114389514A publication Critical patent/CN114389514A/en
Pending legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
    • H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
    • H02P27/06—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
    • H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/32—Means for protecting converters other than automatic disconnection
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
    • H02M7/5387—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Inverter Devices (AREA)

Abstract

The invention discloses a surge protection circuit, a motor controller and household electrical appliances, wherein the motor controller comprises a rectifier bridge and an inverter bridge, the output end of the rectifier bridge is connected with the input end of the inverter bridge, and the surge protection circuit comprises: the first absorption unit is arranged at the input end of the rectifier bridge and is used for carrying out primary absorption on surge voltage applied to the alternating current input side; and the second absorption unit is arranged at the output end of the rectifier bridge, is connected with the inverter bridge in parallel and is used for deeply absorbing the surge voltage subjected to primary absorption. The surge protection circuit can improve the surge protection capability of the motor controller, and is simple in circuit structure and low in cost.

Description

Surge protection circuit, motor controller and household electrical appliance
Technical Field
The invention relates to the technical field of motors, in particular to a surge protection circuit, a motor controller and household electrical appliances.
Background
Motor controllers powered by ac power typically use large capacitance bus electrolytic capacitors to reduce bus voltage fluctuations. However, the electrolytic capacitor of the bus with large capacitance value has larger volume and higher cost. For this reason, in the related art, it is proposed to replace the large-capacitance bus electrolytic capacitor with the small-capacitance film capacitor, but this technique may greatly reduce the surge protection capability of the motor controller, and may cause damage to the motor controller.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art. Therefore, the invention provides a surge protection circuit, a motor controller and household electrical appliance equipment, which are used for improving the surge protection capability of the motor controller and have the advantages of simple circuit structure and low cost.
In a first aspect, an embodiment of the present invention provides a surge protection circuit for a motor controller, where the motor controller includes a rectifier bridge and an inverter bridge, an output end of the rectifier bridge is connected to an input end of the inverter bridge, and the circuit includes: the first absorption unit is arranged at the input end of the rectifier bridge and is used for carrying out primary absorption on surge voltage applied to the alternating current input side; and the second absorption unit is arranged at the output end of the rectifier bridge, is connected with the inverter bridge in parallel and is used for deeply absorbing the surge voltage subjected to primary absorption.
In a second aspect, the present invention provides a motor controller including the surge protection circuit of the motor controller in the embodiment of the first aspect.
In a third aspect, the present invention provides a household electrical appliance, including the surge protection circuit of the motor controller in the embodiment of the first aspect.
The surge protection circuit, the motor controller and the household appliance in the embodiment of the invention are used for improving the surge protection capability of the motor controller and meeting the relevant surge test standard requirements, and the circuit has the advantages of simple structure and low cost.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
Fig. 1 is a block diagram of a surge protection circuit of a motor controller according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a surge protection circuit of the motor controller according to the first embodiment of the present invention;
fig. 3 is a schematic structural diagram of a surge protection circuit of a motor controller according to a second embodiment of the present invention;
fig. 4 is a schematic structural diagram of a surge protection circuit of a motor controller according to a third embodiment of the present invention;
fig. 5 is a schematic diagram of a surge protection circuit of a motor controller according to another embodiment of the present invention;
fig. 6 and 7 are operation schematic diagrams of a surge protection circuit of a motor controller according to an example of the present invention;
fig. 8 and 9 are operation schematic diagrams of a surge protection circuit of a motor controller according to another example of the present invention;
fig. 10 is a block diagram of a motor controller according to an embodiment of the present invention;
fig. 11 is a block diagram illustrating the construction of a home appliance according to the present invention.
Detailed Description
Surge protection circuits, motor controllers, and home appliances of embodiments of the present invention are described below with reference to fig. 1-11, in which like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described with reference to the drawings are illustrative and should not be construed as limiting the invention.
In the embodiment of the present invention, as shown in fig. 1, the motor controller 1 includes a rectifier bridge 11 and an inverter bridge 12, an output end of the rectifier bridge 11 is connected to an input end of the inverter bridge 12, and the motor controller 1 is configured to control the motor M.
Because the large-capacitance-value bus electrolytic capacitor has larger volume and higher cost, the invention adopts the thin-film capacitor C with small capacitance value to replace the large-capacitance-value bus electrolytic capacitor, thereby obviously reducing the volume of the motor controller 1 and achieving the purpose of reducing the hardware cost.
Specifically, referring to fig. 1, a thin film capacitor C with a small capacitance value may be connected between the output terminal of the rectifier bridge 11 and the input terminal of the inverter bridge 12, and the thin film capacitor C is connected in parallel to the output terminal of the rectifier bridge 11 and the input terminal of the inverter bridge 12, respectively. Therefore, the use of a bus electrolytic capacitor with a large capacitance value is avoided, the size of the motor controller 1 can be reduced, and the hardware cost is reduced.
In the aspect of surge protection, the scheme of the electrolytic capacitor with the large-capacitance bus mainly depends on the good surge absorption capacity of the electrolytic capacitor to meet the standard requirement, and a protection circuit is not required to be newly added. However, in the scheme of the electrolytic capacitor without the large-capacitance bus, after the large-capacitance bus electrolytic capacitor is omitted, the surge protection capability of the motor controller is greatly reduced, and the motor controller is likely to be damaged. Therefore, the invention provides a surge protection circuit of a motor controller.
Fig. 1 is a block diagram of a surge protection circuit of a motor controller according to an embodiment of the present invention.
In an embodiment of the present invention, as shown in fig. 1, surge protection circuit 100 includes: a first absorption unit 110 and a second absorption unit 120.
Referring to fig. 1, a first absorption unit 110 is provided at an input terminal of a rectifier bridge 11 for primary absorption of a surge voltage applied to an AC input side. The second absorption unit 120 is disposed at the output end of the rectifier bridge 11, and is connected in parallel with the inverter bridge 12, and is configured to deeply absorb the surge voltage subjected to primary absorption.
In this embodiment, surge protection circuit 100 includes two stages of protection, the first stage of protection is used to accomplish the primary absorption of surge voltage, which can be realized by voltage dependent resistor TVR 1; the second stage of protection is used for completing the second deep absorption of surge voltage, and can be realized by connecting a diode D1 in series with an electrolytic capacitor CE1 with a small capacitance value. Therefore, the surge protection circuit 100 can significantly improve the surge protection capability of the motor controller, meet the requirements of relevant surge test standards, and has the advantages of simple circuit structure and low cost.
As one possible embodiment, as shown in fig. 2, the first absorption unit 110 may include: a voltage dependent resistor TVR 1. Referring to fig. 2, the voltage dependent resistor TVR1 is connected in parallel between the first input terminal and the second input terminal of the rectifier bridge 11.
Specifically, the varistor TVR1 is a nonlinear resistive element. The resistance of the voltage dependent resistor TVR1 is related to the magnitude of the voltage applied across it, and when the voltage applied to the voltage dependent resistor TVR1 is within its nominal value, the resistance of the voltage dependent resistor TVR1 assumes an infinite state with almost no current flow. When the voltage across the voltage dependent resistor TVR1 is slightly greater than the nominal voltage, the voltage dependent resistor TVR1 breaks down rapidly to turn on, and its resistance value drops rapidly, so that the voltage dependent resistor TVR1 is in a conducting state. When the voltage decreases below the nominal voltage, the resistance begins to increase again, and the voltage dependent resistor TVR1 returns to the high-resistance state. Based on this, the overvoltage can be limited through the voltage dependent resistor TVR1, so that the motor controller can be effectively protected. And the voltage dependent resistor TVR1 has the advantages of excellent performance, low price, small volume, wide working voltage range, quick response to overvoltage pulse, strong impact current resistance, small leakage current (less than a few microamperes to dozens of microamperes), small resistance temperature coefficient and the like.
As one possible embodiment, as shown in fig. 3 and 4, the second absorption unit 120 may include a diode D1 and an electrolytic capacitor CE 1.
Referring to fig. 3 and 4, the diode D1 is connected in series with the electrolytic capacitor CE1, the diode D1 and the electrolytic capacitor CE1 connected in series are connected in parallel between the first output end and the second output end of the rectifier bridge 11, and the forward conduction direction of the diode D1 is consistent with the charging direction of the electrolytic capacitor CE 1.
Wherein, the capacitance value of the electrolytic capacitor CE1 is smaller than the preset capacitance threshold value. For example, the electrolytic capacitor CE1 may have a capacitance of 60 μ F to 150 μ F, such as 100 μ F.
In this embodiment, the forward conduction direction of the diode D1 is set to be the same as the charging direction of the electrolytic capacitor CE1, so that it can be ensured that the small-capacity electrolytic capacitor CE1 can only be charged by the bus voltage and cannot be discharged, and the problem that the ripple voltage and the ripple current of the small-capacity electrolytic capacitor CE1 exceed the standard can be effectively avoided.
Referring to fig. 3 and 4, the diode D1 may be connected in series to the positive electrode side of the electrolytic capacitor CE1 or to the negative electrode side of the electrolytic capacitor CE 1.
Specifically, in one example, referring to fig. 3, the anode of the diode D1 is connected to the first output terminal of the rectifier bridge 11, the cathode of the diode D1 is connected to the positive terminal of the electrolytic capacitor CE1, and the cathode of the electrolytic capacitor CE1 is connected to the second output terminal of the rectifier bridge 11 and then grounded.
In another example, referring to fig. 4, the positive terminal of the electrolytic capacitor CE1 is connected to the first output terminal of the rectifier bridge 11, the negative terminal of the electrolytic capacitor CE1 is connected to the anode of the diode D1, and the cathode of the diode is connected to the second output terminal of the rectifier bridge and then grounded.
Further, as a possible embodiment, as shown in fig. 3 and 4, the second absorption unit 120 may further include a discharge load 121.
Referring to fig. 3 and 4, the discharging load 121 is connected in parallel with the electrolytic capacitor CE1 for discharging the electric energy absorbed by the electrolytic capacitor CE 1. The discharging load 121 may be a fixed load, such as a bleeder resistor, or may be other functional circuits.
In this embodiment, the discharging load 121 connected in parallel to the two ends of the electrolytic capacitor CE1 can provide a discharging circuit for the electrolytic capacitor CE1, so that the capacitor voltage can be discharged to a normal level in time after the surge is absorbed by the electrolytic capacitor CE 1.
It should be noted that, referring to fig. 2 to fig. 4, the rectifier bridge 11 may be an H-bridge composed of four diodes (denoted as D2, D3, D4, and D5) to convert ac power into dc power; the inverter bridge 12 may be a three-phase bridge composed of six power switching tubes (denoted as G1, G2, G3, G4, G5, and G6) to convert dc power into ac power to be input to the motor.
In one embodiment of the present invention, as shown in fig. 5, the surge protection circuit 100 may further include an absorption resistor R.
Referring to fig. 5, the absorption resistor R is connected in series between the first output terminal of the rectifier bridge 11 and the second absorption unit 120. The absorption resistor R serves as a buffer device and can be used for absorbing the surge voltage absorbed by the primary absorption, and the second absorption unit 120 can be used for absorbing the surge voltage absorbed by the absorption resistor R, so that the surge three-level protection can be realized.
To understand the surge protection circuit 100 according to the embodiment of the present invention, the following describes the operation principle of the surge protection circuit 100 according to the embodiment of the present invention with reference to fig. 6, fig. 7, fig. 8, and fig. 9:
as shown in fig. 6, 7, 8 and 9, a corresponding surge protection circuit 100 is newly added to a motor controller hardware circuit without a bus electrolytic capacitor. In terms of device type selection, the surge current bearing capacity of the diode D1 and the capacitance value of the electrolytic capacitor CE1 are mainly considered. Taking a differential mode 2000V surge voltage as an example, the capacitance value of the electrolytic capacitor CE1 is generally about 100 μ F, and the model selection of the voltage dependent resistor TVR1 is only required to refer to the input alternating voltage, and the model can be selected to be 14D561 in a 220V alternating current power supply system.
When a surge voltage is applied to the ac input side of the motor controller 1, a surge current flow path is as shown in fig. 6 and 8. Referring to fig. 6 and 8, the voltage dependent resistor TVR1 is located at the frontmost end of the circuit, the surge current is primarily discharged at the voltage dependent resistor TVR1, the discharge current is i1 in fig. 6 and 8, and the amplitude of the surge voltage is reduced to a certain extent.
As an example, referring to fig. 6, when the cathode of the diode D1 is connected to the positive terminal of the electrolytic capacitor CE1, after the surge current passes through the rectifier bridge 11 and the diode D1, a secondary absorption is obtained at the electrolytic capacitor CE1, and the leakage current is i2 in fig. 6, where the surge voltage amplitude is further reduced, and the voltage across the electrolytic capacitor CE1 has a spike. When the electrolytic capacitor CE1 and the voltage dependent resistor TVR1 are properly selected, the peak voltage of the electrolytic capacitor CE1 may be lower than the withstand voltage of the power devices (i.e., the switching tubes) in the inverter bridge 12, thereby ensuring that the power devices are not damaged by surge voltage.
When the surge voltage is applied, the peak voltage on the electrolytic capacitor CE1 needs to be released in time, on one hand, preparation is made for the next surge, and on the other hand, the device is prevented from being damaged due to the fact that the voltage at the two ends of the electrolytic capacitor CE1 is too high. With the discharge load 121 set, the peak voltage discharge path across the electrolytic capacitor CE1 is shown in fig. 7, and the bleed current is io in fig. 7.
As another example, referring to fig. 8, the anode of the diode D1 is connected to the negative terminal of the electrolytic capacitor CE1, and when the surge current passes through the rectifier bridge 11, the surge current is absorbed again at the electrolytic capacitor CE1, and the leakage current is i2 in fig. 8, where the surge voltage amplitude is further reduced, and the voltage across the electrolytic capacitor CE1 appears as a spike. When the electrolytic capacitor CE1 and the voltage dependent resistor TVR1 are properly selected, the peak voltage of the electrolytic capacitor CE1 can be lower than the withstand voltage of the power device in the inverter bridge 12, so that the power device is prevented from being damaged by surge voltage.
When the surge voltage is applied, the peak voltage on the electrolytic capacitor CE1 is released through the discharging load 121, the discharging path of the peak voltage on the electrolytic capacitor CE1 is shown in fig. 9, and the discharging current is io in fig. 9.
In summary, in the surge protection circuit of the embodiment of the invention, the amplitude of the bus voltage is finally controlled below the highest withstand voltage value of the power tube of the inverter bridge through the primary absorption of the first absorption unit and the secondary absorption of the second absorption unit, so that the power tube is not damaged by high voltage. In addition, the surge protection circuit is simple in topology and low in comprehensive cost, can meet the requirement of surge protection level of about 2000V on the surge protection of the motor controller without a large-capacitance bus electrolytic capacitor, and has high application value.
Fig. 10 is a block diagram of a motor controller according to an embodiment of the present invention.
In this embodiment, as shown in fig. 10, the motor controller 1 includes the surge protection circuit 100 of the motor controller of the above-described embodiment.
The motor controller 1 may be used to drive various motors, including but not limited to a washing machine motor, a refrigerator compressor motor, an air conditioner compressor motor, and the like.
According to the motor controller provided by the embodiment of the invention, the amplitude of the bus voltage can be controlled below the highest withstand voltage value of the power tube of the inverter bridge through the surge protection circuit, so that the power tube is prevented from being damaged by high voltage, the circuit topology is simple, and the comprehensive cost is low.
Fig. 11 is a block diagram of a home appliance according to an embodiment of the present invention.
In this embodiment, as shown in fig. 11, the household electrical appliance 1000 includes the surge protection circuit 100 of the motor controller of the above-described embodiment.
The household electrical appliance 1000 may further include a motor and the motor controller 1 of the above embodiment, and the household electrical appliance 1000 may be, but is not limited to, a washing machine, a refrigerator, an air conditioner, and the like.
According to the household appliance provided by the embodiment of the invention, the amplitude of the bus voltage can be controlled below the highest withstand voltage value of the power tube of the inverter bridge through the surge protection circuit, so that the power tube is prevented from being damaged by high voltage, the circuit topology is simple, and the comprehensive cost is low.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
In the description herein, the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like refer to orientations and positional relationships based on the orientation shown in the drawings, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be construed as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the description of the present specification, unless otherwise specified, the terms "mounted," "connected," "fixed," and the like are to be construed broadly, e.g., as meaning fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.

Claims (11)

1. A surge protection circuit of a motor controller is characterized in that the motor controller comprises a rectifier bridge and an inverter bridge, wherein the output end of the rectifier bridge is connected with the input end of the inverter bridge, and the circuit comprises:
the first absorption unit is arranged at the input end of the rectifier bridge and is used for carrying out primary absorption on surge voltage applied to the alternating current input side;
and the second absorption unit is arranged at the output end of the rectifier bridge, is connected with the inverter bridge in parallel and is used for deeply absorbing the surge voltage subjected to primary absorption.
2. The circuit of claim 1, wherein the first sinking unit comprises:
the piezoresistor is connected between the first input end and the second input end of the rectifier bridge in parallel.
3. The circuit according to claim 1 or 2, wherein the second absorption unit comprises a diode and an electrolytic capacitor, the diode is connected in series with the electrolytic capacitor and then connected in parallel between the first output end and the second output end of the rectifier bridge, and the forward conduction direction of the diode is consistent with the charging direction of the electrolytic capacitor.
4. The circuit of claim 3, wherein the second absorption unit further comprises a discharge load connected in parallel with the electrolytic capacitor to bleed off the electric energy absorbed by the electrolytic capacitor.
5. The circuit of claim 3, wherein an anode of the diode is connected to the first output terminal of the rectifier bridge, a cathode of the diode is connected to the positive terminal of the electrolytic capacitor, and a negative terminal of the electrolytic capacitor is connected to the second output terminal of the rectifier bridge and then grounded.
6. The circuit of claim 3, wherein the positive terminal of the electrolytic capacitor is connected to the first output terminal of the rectifier bridge, the negative terminal of the electrolytic capacitor is connected to the anode of the diode, and the cathode of the diode is connected to the second output terminal of the rectifier bridge and then grounded.
7. The circuit of claim 3, wherein the capacitance of the electrolytic capacitor is less than a predetermined capacitance threshold.
8. The circuit of claim 7, wherein the capacitance of the electrolytic capacitor is 60 μ F to 150 μ F.
9. The circuit of claim 3, further comprising a snubber resistor connected in series between the first output terminal of the rectifier bridge and the second snubber unit.
10. A motor controller characterized by comprising a surge protection circuit of the motor controller according to any one of claims 1-9.
11. An electric household appliance comprising a surge protection circuit of a motor controller according to any of claims 1 to 9.
CN202210062286.0A 2022-01-19 2022-01-19 Surge protection circuit, motor controller and household electrical appliance Pending CN114389514A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202210062286.0A CN114389514A (en) 2022-01-19 2022-01-19 Surge protection circuit, motor controller and household electrical appliance

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202210062286.0A CN114389514A (en) 2022-01-19 2022-01-19 Surge protection circuit, motor controller and household electrical appliance

Publications (1)

Publication Number Publication Date
CN114389514A true CN114389514A (en) 2022-04-22

Family

ID=81202958

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202210062286.0A Pending CN114389514A (en) 2022-01-19 2022-01-19 Surge protection circuit, motor controller and household electrical appliance

Country Status (1)

Country Link
CN (1) CN114389514A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115580127A (en) * 2022-11-09 2023-01-06 惠州市乐亿通科技有限公司 Surge protection circuit and inverter

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5811963A (en) * 1994-10-11 1998-09-22 Novitas Incorporated Line powered DC power supply
CN104079188A (en) * 2014-06-18 2014-10-01 广州金升阳科技有限公司 Flyback switching power circuit
CN109921652A (en) * 2019-03-12 2019-06-21 广东美的制冷设备有限公司 Motor feed circuit and household electrical appliance with it
CN110071623A (en) * 2019-01-16 2019-07-30 广东美的制冷设备有限公司 Drive control circuit, air-conditioner controller and air conditioner
CN215267638U (en) * 2021-05-13 2021-12-21 深圳市垅运照明电器有限公司 Surge voltage absorption circuit

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5811963A (en) * 1994-10-11 1998-09-22 Novitas Incorporated Line powered DC power supply
CN104079188A (en) * 2014-06-18 2014-10-01 广州金升阳科技有限公司 Flyback switching power circuit
CN110071623A (en) * 2019-01-16 2019-07-30 广东美的制冷设备有限公司 Drive control circuit, air-conditioner controller and air conditioner
CN109921652A (en) * 2019-03-12 2019-06-21 广东美的制冷设备有限公司 Motor feed circuit and household electrical appliance with it
CN215267638U (en) * 2021-05-13 2021-12-21 深圳市垅运照明电器有限公司 Surge voltage absorption circuit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115580127A (en) * 2022-11-09 2023-01-06 惠州市乐亿通科技有限公司 Surge protection circuit and inverter

Similar Documents

Publication Publication Date Title
CN109921453B (en) Distributed energy consumption device and module fault bypass control method
US10177683B2 (en) Multi-level inverter
CN110601531B (en) Power supply control circuit and vehicle-mounted air conditioner
JP5186829B2 (en) Direct power converter
CN110417251B (en) PFC circuit and air conditioner
CN113328616A (en) Valley filling circuit
CN114389514A (en) Surge protection circuit, motor controller and household electrical appliance
CN107947557A (en) A kind of soft starting circuit of anti-over-pressed, under-voltage surge
CN113595393B (en) DC/DC module, power generation system, and DC/DC module protection method
CN215186536U (en) Motor controller and motor using same
CN209748405U (en) Household electrical appliance and passive power factor correction circuit thereof
CN114499139A (en) Energy discharge device, energy discharge power supply system and energy discharge method adopting capacitance resonance mode
CN209692604U (en) Drive control circuit and air conditioner
CN201153206Y (en) Electronic type overload relay capable of automatic reset
CN110829818A (en) Power supply circuit, control method and device of power supply circuit and air conditioner
CN218919975U (en) Protection circuit module and unmanned aerial vehicle
CN111030243A (en) Capacitor circuit and capacitor device
CN214335147U (en) Power expansion circuit and device for contactor
CN218570106U (en) Rectifier direct current overvoltage peak suppression circuit
CN219697290U (en) Self-destruction overvoltage protection circuit
CN216959661U (en) Switching power supply circuit, multi-level variable current circuit and household appliance
CN210430997U (en) Circuit for feedback energy absorption and low voltage ride through of servo driver
CN216699854U (en) Drive circuit, inverter and electric equipment
CN218829613U (en) Direct current converter, energy storage inverter, energy storage system, light storage system and wind and light storage system
CN216451279U (en) Circuit for high-voltage high-capacity energy storage switch and protection

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
RJ01 Rejection of invention patent application after publication

Application publication date: 20220422