CN114977969A - Control circuit for improving conversion rate of variable frequency controller - Google Patents

Control circuit for improving conversion rate of variable frequency controller Download PDF

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Publication number
CN114977969A
CN114977969A CN202210544176.8A CN202210544176A CN114977969A CN 114977969 A CN114977969 A CN 114977969A CN 202210544176 A CN202210544176 A CN 202210544176A CN 114977969 A CN114977969 A CN 114977969A
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CN
China
Prior art keywords
filter capacitor
surge current
control circuit
module
mcu
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
CN202210544176.8A
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Chinese (zh)
Inventor
朱宇杉
陈宇
胡扶遥
刘龙球
刘猛
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.)
Huangshi Donper Compressor Co Ltd
Original Assignee
Huangshi Donper Compressor Co Ltd
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Publication date
Application filed by Huangshi Donper Compressor Co Ltd filed Critical Huangshi Donper Compressor Co Ltd
Priority to CN202210544176.8A priority Critical patent/CN114977969A/en
Publication of CN114977969A publication Critical patent/CN114977969A/en
Pending legal-status Critical Current

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    • 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
    • H02H9/005—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection avoiding undesired transient conditions
    • 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
    • H02H9/02—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current
    • 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
    • H02M1/0003—Details of control, feedback or regulation circuits
    • H02M1/0012—Control circuits using digital or numerical techniques
    • 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
    • H02M1/00—Details of apparatus for conversion
    • H02M1/36—Means for starting or stopping converters
    • 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
    • H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
    • H02M5/40—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc
    • H02M5/42—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters
    • H02M5/44—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac
    • H02M5/453—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M5/458—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • 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
    • H02P1/00—Arrangements for starting electric motors or dynamo-electric converters
    • H02P1/02—Details of starting control
    • H02P1/022—Security devices, e.g. correct phase sequencing
    • 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
    • H02P29/00—Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors
    • H02P29/02—Providing protection against overload without automatic interruption of supply
    • H02P29/024—Detecting a fault condition, e.g. short circuit, locked rotor, open circuit or loss of load
    • H02P29/027—Detecting a fault condition, e.g. short circuit, locked rotor, open circuit or loss of load the fault being an over-current
    • 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
    • H02P29/00—Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors
    • H02P29/02—Providing protection against overload without automatic interruption of supply
    • H02P29/024—Detecting a fault condition, e.g. short circuit, locked rotor, open circuit or loss of load
    • H02P29/028—Detecting a fault condition, e.g. short circuit, locked rotor, open circuit or loss of load the motor continuing operation despite the fault condition, e.g. eliminating, compensating for or remedying the fault
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes

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

Abstract

The invention relates to a control circuit for improving the conversion rate of a variable frequency controller, which comprises an EMC (electro magnetic compatibility) filtering and rectifying module, a surge current control circuit module, an inverter circuit module, a motor, an MCU (microprogrammed control Unit) power input and an MCU control unit module. Aiming at the problems that in the prior art, a plurality of components are needed to be cooperatively controlled, a control chain is complicated, the cost of the components is high, the operation and conversion efficiency of a frequency converter is low, and the stability of a circuit structure is reduced, the invention realizes the suppression of surge current through an R1 surge current suppression resistor of a surge current control circuit; after the electrolytic capacitor is fully charged, the MCU controls the conduction of the electrolytic capacitor through the grid of the control switch M1, the R1 surge current suppression resistor is short-circuited, components and parts are reduced while the reliability of a circuit system is ensured, the cost is saved, and the technical effect of improving the conversion efficiency of the frequency converter in the operation process is also effectively achieved.

Description

Control circuit for improving conversion rate of variable frequency controller
Technical Field
The invention relates to the technical field of variable frequency compressors, in particular to a control circuit for improving the conversion rate of a variable frequency controller.
Background
In the daily life of electronic equipment, no matter small-power electronic equipment such as a bulb and the like or high-power electronic equipment such as a frequency converter and the like in household appliances, once the equipment is powered on, surge pulse current can be formed in an equipment loop because the running current of the equipment needs to reach 2-3 times of rated working current in a short time, and if the pulse current is not inhibited, the pulse current can cause great impact on a relay switch and a load of a terminal user, and the service life of the electronic equipment can be shortened under certain extreme conditions. At present, two novel circuit design schemes are available to achieve the purpose of suppressing surge current, one is a circuit structure for increasing bolt lock control, as shown in fig. 2; one is a capacitor pre-charging circuit structure, see fig. 3; both of these schemes are hardware implementations.
In the circuit structure for increasing the latch control, as shown in fig. 2, two mosfets need to be configured and used, which are a P-type Mosfet and an N-type Mosfet, respectively, and at the same time, a PNP-type triode and a Z3 voltage regulator tube are also needed to implement the latch function for the mosfets, so as to turn on the mosfets and short the NTC resistor. The circuit structure needs a plurality of components for cooperative control, a control chain is complex, the cost of the components is high, and the operation and conversion efficiency of the frequency converter is low.
In the structure of the capacitor pre-charging circuit, as shown in fig. 3, the E2 and E3 electrolytic capacitors need to be charged first, then the E1 capacitor needs to be charged, and after the E1 capacitor is charged, the Q1 Mosfet can be turned on and short-circuits the NTC resistor. In the circuit structure, the Mosfet is switched on or off only through the charging and discharging process of the charging capacitor, the conversion rate of the frequency converter cannot be timely improved, and the stability of the circuit structure is also reduced.
In a word, above-mentioned two kinds of circuit structures all are pure hardware scheme, and too loaded down with trivial details complicacy, owing to select too much components and parts to reduce frequency conversion board dynamic efficiency and conversion rate among the circuit structure, too single simple and easy can not in time promote frequency conversion board efficiency, and the reliability deviation. Therefore, components are reduced, and the cost is reduced; promote converter operating efficiency and conversion efficiency be for the problem of awaiting solution.
Disclosure of Invention
In view of the above technical problems in the related art, the present invention provides a low standby power consumption inverter controller for a refrigerator, which can overcome the above disadvantages in the prior art. The technical scheme is as follows:
a control circuit for improving the conversion rate of a variable frequency controller comprises an EMC filtering and rectifying module, a surge current control circuit module, an inverter circuit module, a motor, an MCU power input and an MCU control unit module; the EMC filtering and rectifying module comprises a filter capacitor CX1, a common-mode inductor LC1, a filter capacitor CX2, a filter capacitor CY1, a filter capacitor CY2, a passive PFC inductor L1, a rectifier bridge DB1 and a filter capacitor C1; the surge current control circuit module comprises a bus electrolytic capacitor Cbus, a Mosfet M1, a control switch M1 and a surge current suppression resistor R1; the inverter circuit module comprises 6 IGBT type or Mosfet type power switch components; one end of a filter capacitor CX1 of the EMC filtering and rectifying module is connected with one end of a primary side of a common-mode inductor LC1, the other end of the primary side of the common-mode inductor LC1 is respectively connected with one end of a filter capacitor CX2, one end of a filter capacitor CY1 and one end of a passive PFC inductor L1; the other end of the passive PFC inductor L1 is connected with a No. 2 pin of a rectifier bridge DB 1; the 3 rd pin of the rectifier bridge DB1 is respectively connected with the other end of the filter capacitor CY2, the other end of the filter capacitor CX2 and the 4 th end of the common-mode inductor LC 1; the other end of the filter capacitor CY1 and one end of the filter capacitor CY2 are grounded. The 2 nd end of the common mode inductor LC1 is connected with the other end of the filter capacitor CX 1; the 1 st pin output by the rectifier bridge DB1 is respectively connected with one end of a filter capacitor C1, the positive end of a bus electrolytic capacitor Cbus of the surge current control circuit module and the drain (D) ends of power switches SW1, SW2 and SW3 in the inverter circuit module; SW1, SW2, SW3, SW4, SW5 and SW6 of the power switch are connected with the surge current suppression resistor R1 in parallel; the other end of the bus electrolytic capacitor Cbus is connected with a drain electrode of the Mosfet M1; the other end of the current detection resistor R1 of the surge current control circuit module is respectively connected with one end of SW4, SW5 and SW6 of the power switch in the inverter circuit module, the source of Mosfet M1, the other end of the filter capacitor C1 and the 4 th pin of the rectifier bridge DB 1.
Furthermore, the sources of the SW1 and SW4 of the power switch are connected with the 1 st pin of the motor, the sources of the SW2 and SW5 of the power switch are connected with the 2 nd pin of the motor, and the sources of the SW3 and SW6 of the power switch are connected with the 3 rd pin of the motor.
Further, the MCU power input module is connected with the MCU control unit module.
Further, the MCU is respectively connected with the grid of the control switch M1 and the grids of 6 power switches SW 1-SW 6 in the inverter circuit.
The invention has the beneficial effects that: the patent relates to a control circuit for improving the conversion rate of a frequency conversion controller, wherein in the process of the initial electrification of a frequency converter, the suppression of surge current is realized through an R1 surge current suppression resistor of a surge current control circuit; after the electrolytic capacitor at the bus end is fully charged, the MCU controls the conduction of the electrolytic capacitor through the grid of the control switch M1, so that the R1 surge current suppression resistor is short-circuited, the reliability of a circuit system is ensured, the technical effect of effectively improving the conversion efficiency of the frequency converter in the operation process is achieved, components are reduced, and the cost is saved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a structural diagram of a control circuit for increasing conversion rate of a variable frequency controller.
Fig. 2 is a circuit diagram of a prior art added latch control.
Fig. 3 is a block diagram of a prior art capacitor precharge circuit.
FIG. 4 is a graph showing the effect of the experimental result data curve.
Detailed Description
The technical solution of the present invention will be described clearly and completely with reference to fig. 1 and 4 of the accompanying drawings of the present specification, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, not all of them; all other embodiments that can be derived by one of ordinary skill in the art from the embodiments disclosed herein are intended to be within the scope of the present invention.
Embodiment 1 discloses a control circuit for improving conversion rate of a variable frequency controller, which comprises an EMC filtering and rectifying module, a surge current control circuit module, an inverter circuit module, a motor, an MCU power input and an MCU control unit module; the EMC filtering and rectifying module comprises a filter capacitor CX1, a common-mode inductor LC1, a filter capacitor CX2, a filter capacitor CY1, a filter capacitor CY2, a passive PFC inductor L1, a rectifier bridge DB1 and a filter capacitor C1. The circuit structure of EMC filtering and rectifier module can avoid the high frequency electromagnetic noise in the circuit to return the electric wire netting, passive PFC inductance is used for improving the harmonic current that frequency conversion board power factor and limit value frequency conversion board produced, the rectifier bridge is used for passing through full-bridge full wave rectification conversion generating line direct current output with the alternating current of electric wire netting input. The surge current control circuit module comprises a bus electrolytic capacitor Cbus, a Mosfet M1, a control switch M1 and a surge current suppression resistor R1; the Cbus electrolytic capacitor is used for filtering bus direct current output by the rectifier bridge, and the surge current suppression resistor R1 is used for suppressing surge current in a circuit structure when the circuit is electrified for the first time. In the time interval when the alternating current enters the frequency conversion board for the first time, the control switch M1 keeps an off state, and the current flows through the surge current suppression resistor completely. In the time interval before the compressor is started, the control switch M1 continues to be kept in the off state, and the inrush current continues to be suppressed. After the bus electrolytic capacitor is fully charged/discharged, the control switch M1 is switched to be in a conducting state in a time interval after surge current in a circuit is remarkably reduced, and the conversion efficiency of the frequency converter in the operation process is effectively improved by short-circuiting the R1 surge current suppression resistor through the self characteristics of components; one end of a filter capacitor CX1 of the EMC filtering and rectifying module is connected with one end of a primary side of a common-mode inductor LC1, the other end of the primary side of the common-mode inductor LC1 is respectively connected with one end of a filter capacitor CX2, one end of a filter capacitor CY1 and one end of a passive PFC inductor L1; the other end of the passive PFC inductor L1 is connected with a No. 2 pin of a rectifier bridge DB 1; the 3 rd pin of the rectifier bridge DB1 is respectively connected with the other end of the filter capacitor CY2, the other end of the filter capacitor CX2 and the 4 th end of the common-mode inductor LC 1; the other end of the filter capacitor CY1 and one end of the filter capacitor CY2 are grounded. The 2 nd end of the common mode inductor LC1 is connected with the other end of the filter capacitor CX 1; the 1 st pin output by the rectifier bridge DB1 is respectively connected with one end of a filter capacitor C1, the positive electrode end of a bus electrolytic capacitor Cbus of the surge current control circuit module and the drain ends of power switches SW1, SW2 and SW3 in the inverter circuit module. The inverter circuit module comprises 6 IGBT type or Mosfet type power switch components, and current is filtered by the bus electrolytic capacitor and then flows to the inverter circuit module. SW1, SW2, SW3, SW4, SW5 and SW6 of the power switch are connected with the surge current suppression resistor R1 in parallel; the other end of the bus electrolytic capacitor Cbus is connected with a drain electrode of Mosfet M1; the other end of the current detection resistor R1 of the surge current control circuit module is respectively connected with one end of SW4, SW5 and SW6 of a power switch in the inverter circuit module, the source of Mosfet M1, the other end of the filter capacitor C1 and the 4 th pin of the rectifier bridge DB 1; the sources of SW1 and SW4 of the power switch are connected with the 1 st pin of the motor, the sources of SW2 and SW5 of the power switch are connected with the 2 nd pin of the motor, and the sources of SW3 and SW6 of the power switch are connected with the 3 rd pin of the motor; the MCU is respectively connected with the grid of a control switch M1 and the grids of 6 power switches SW 1-SW 6 in the inverter circuit; and the MCU power input module is connected with the MCU control unit module. The current detection resistor is used for measuring and acquiring motor feedback phase current information by an MCU (microprogrammed control unit), the divider resistor from bus voltage to the MCU is used for measuring and acquiring bus voltage information by the MCU, the voltage waveform between three phases of the motor is estimated by combining a motor back electromotive force model, the MCU control unit estimates continuous rotor positions, and FOC magnetic field directional control defined by mathematical logic is realized.
Example 2, based on the test results of the present application, the technical effect is illustrated step by step, see fig. 4.
STEP1, when the alternating current does not flow into the frequency converter, the control switch M1 connected with the R1 surge current suppression resistor in parallel is in an off state; in the time interval when the alternating current enters the frequency conversion board for the first time, the control switch M1 keeps an off state, and the current flows through the surge current suppression resistor completely.
STEP2, when the alternating current flows into the frequency converter, the control switch M1 connected with the R1 surge current suppression resistor in parallel is in an off state, the input current only flows through the R1 surge current suppression resistor, and the circuit structure can effectively suppress the surge current.
STEP3, the MCU controls a control switch M1 connected with the R1 surge current suppression resistor in parallel to be conducted, and the electric power consumption on the R1 surge current suppression resistor is effectively reduced; after the bus electrolytic capacitor is fully charged/discharged, the control switch M1 is switched on in a time interval after surge current in the circuit is remarkably reduced, and the conversion efficiency of the frequency converter in the operation process is effectively improved by short-circuiting the R1 surge current suppression resistor through the self characteristics of the component.
STEP4 control switch M1 in parallel with the R1 surge current suppression resistor is kept in a conducting state during the operation of the frequency converter.
STEP5 when the AC current stops flowing into the frequency converter, the control switch M1 connected in parallel with the R1 surge current suppression resistor is in an open state.
The surge current is suppressed by the R1 surge current suppression resistor of the surge current control circuit described above; after the electrolytic capacitor is fully charged, the MCU controls the conduction of the electrolytic capacitor through the grid of the control switch M1, so that the R1 surge current is short-circuited to ensure the reliability of a circuit system.
The present invention is not limited to the above-mentioned preferred embodiments, and any other products in various forms can be obtained by anyone with the teaching of the present invention, but any changes in the method and the technical solutions which are the same or similar to the present application fall within the protection scope of the present invention.

Claims (4)

1. A control circuit for improving the conversion rate of a variable frequency controller is characterized by comprising an EMC filtering and rectifying module, a surge current control circuit module, an inverter circuit module, a motor, an MCU power input and an MCU control unit module; the EMC filtering and rectifying module comprises a filter capacitor CX1, a common-mode inductor LC1, a filter capacitor CX2, a filter capacitor CY1, a filter capacitor CY2, a passive PFC inductor L1, a rectifier bridge DB1 and a filter capacitor C1; the surge current control circuit module comprises a bus electrolytic capacitor Cbus, a Mosfet M1, a control switch M1 and a surge current suppression resistor R1; the inverter circuit module comprises 6 IGBT type or Mosfet type power switch components; one end of a filter capacitor CX1 of the EMC filtering and rectifying module is connected with one end of a primary side of a common-mode inductor LC1, the other end of the primary side of the common-mode inductor LC1 is respectively connected with one end of a filter capacitor CX2, one end of a filter capacitor CY1 and one end of a passive PFC inductor L1; the other end of the passive PFC inductor L1 is connected with a No. 2 pin of a rectifier bridge DB 1; the 3 rd pin of the rectifier bridge DB1 is respectively connected with the other end of the filter capacitor CY2, the other end of the filter capacitor CX2 and the 4 th end of the common-mode inductor LC 1; the other end of the filter capacitor CY1 and one end of the filter capacitor CY2 are grounded; the 2 nd end of the common mode inductor LC1 is connected with the other end of the filter capacitor CX 1; the 1 st pin output by the rectifier bridge DB1 is respectively connected with one end of a filter capacitor C1, the positive end of a bus electrolytic capacitor Cbus of the surge current control circuit module and the drain (D) ends of power switches SW1, SW2 and SW3 in the inverter circuit module; SW1, SW2, SW3, SW4, SW5 and SW6 of the power switch are connected with the surge current suppression resistor R1 in parallel; the other end of the bus electrolytic capacitor Cbus is connected with a drain electrode of the Mosfet M1; the other end of the current detection resistor R1 of the surge current control circuit module is respectively connected with one end of SW4, SW5 and SW6 of the power switch in the inverter circuit module, the source of Mosfet M1, the other end of the filter capacitor C1 and the 4 th pin of the rectifier bridge DB 1.
2. The control circuit for increasing the conversion rate of the inverter controller as claimed in claim 1, wherein the sources of the power switches SW1 and SW4 are connected to pin 1 of the motor, the sources of the power switches SW2 and SW5 are connected to pin 2 of the motor, and the sources of the power switches SW3 and SW6 are connected to pin 3 of the motor.
3. The control circuit for improving the conversion rate of the variable frequency controller according to claim 1, wherein the MCU power input module is connected with the MCU control unit module.
4. The control circuit for increasing the conversion rate of the inverter controller according to claim 1, wherein the MCU is respectively connected to the gate of the control switch M1 and the gates of the 6 power switches SW 1-SW 6 in the inverter circuit.
CN202210544176.8A 2022-05-18 2022-05-18 Control circuit for improving conversion rate of variable frequency controller Pending CN114977969A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202210544176.8A CN114977969A (en) 2022-05-18 2022-05-18 Control circuit for improving conversion rate of variable frequency controller

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202210544176.8A CN114977969A (en) 2022-05-18 2022-05-18 Control circuit for improving conversion rate of variable frequency controller

Publications (1)

Publication Number Publication Date
CN114977969A true CN114977969A (en) 2022-08-30

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN202210544176.8A Pending CN114977969A (en) 2022-05-18 2022-05-18 Control circuit for improving conversion rate of variable frequency controller

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