CN113937992B - Alternating current power supply sudden-adding detection suppression system in double-input direct current converter - Google Patents
Alternating current power supply sudden-adding detection suppression system in double-input direct current converter Download PDFInfo
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- CN113937992B CN113937992B CN202111219633.8A CN202111219633A CN113937992B CN 113937992 B CN113937992 B CN 113937992B CN 202111219633 A CN202111219633 A CN 202111219633A CN 113937992 B CN113937992 B CN 113937992B
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- 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
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- 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
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
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- 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
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac 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
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac 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
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac 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 with automatic control of output voltage or current, e.g. switching regulators
-
- 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
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/06—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes without control electrode or semiconductor devices without control electrode
- H02M7/08—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes without control electrode or semiconductor devices without control electrode arranged for operation in parallel
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Rectifiers (AREA)
Abstract
The application discloses an alternating current power supply sudden-addition detection suppression system in a double-input direct current converter, which comprises a three-phase rectifying circuit, a unidirectional rectifying circuit and a DC/DC converter circuit, wherein the three-phase rectifying circuit is connected with the DC/DC converter circuit; positive pole series R of three-phase rectifying circuit 1 Rear AND filter capacitor C dc The positive electrode of the three-phase rectifying circuit is connected with the filter capacitor C dc R is the negative electrode of 1 Parallel to K1; filter capacitor C dc The positive electrode and the negative electrode of the capacitor are respectively connected to the DC/DC conversion circuit; positive pole series R of unidirectional rectification circuit 2 Rear AND filter capacitor C dc The positive electrode of the unidirectional rectification circuit is connected with the filter capacitor C dc R is the negative electrode of 2 In parallel with K2. The direct-current converter has the advantages that the control system of the DC/DC conversion circuit is used for accurately detecting the input of the high-voltage power supply, so that the negative influence of the impact of the sudden power supply on the output voltage or current dynamic control performance of the direct-current converter is inhibited, and the phenomenon of overvoltage and overcurrent is avoided when the high-voltage power supply is suddenly input.
Description
Technical Field
The application belongs to the field of alternating current power supply detection, and particularly relates to an alternating current power supply sudden-increase detection suppression system in a double-input direct current converter.
Background
In some applications, the DC converter has a single-phase ac input and a three-phase ac input, respectively, which are collected on a common DC bus via respective rectifying circuits to provide power for the subsequent DC/DC conversion circuit. The two ac power sources may or may not be present at the same time, for example, only a single-phase ac power source provides power, or only a three-phase ac power source provides power for the DC/DC conversion circuit at the subsequent stage, or both power sources are present at the same time (the voltage is higher to power the DC/DC conversion circuit at the subsequent stage). Since the dc voltage Vdc3 rectified by the three-phase ac power supply is significantly higher than the dc voltage Vdc1 rectified by the single-phase ac voltage. If only a single-phase alternating current power supply is rectified to supply power to the post-stage DC/DC conversion circuit under the initial condition, when the three-phase alternating current power supply is suddenly input, the control system of the post-stage DC/DC conversion circuit can not adjust the control quantity in time due to the sudden high-voltage input, and output overvoltage or output overcurrent is caused, so that the system has protection misoperation, and the normal operation of the whole system is influenced. There is therefore a need for a measure that can effectively cope with the above conditions.
Disclosure of Invention
Based on the above problems, the present application provides a system for suppressing ac power supply burst detection in a dual-input dc converter, which can accurately detect the input of high-voltage power. The technical proposal is that,
an alternating current power supply sudden-increase detection suppression system in a double-input direct current converter comprises a three-phase rectifying circuit, a unidirectional rectifying circuit and a DC/DC converter circuit;
positive electrode series resistor R of three-phase rectifying circuit 1 Rear AND filter capacitor C dc The positive electrode of the three-phase rectifying circuit is connected with the filter capacitor C dc The negative electrode of the resistor R 1 And controllable switch K 1 Parallel connection; the filter capacitor C dc The positive and negative poles of (a) are respectively connected to the DC/DC converter circuit;
positive electrode series resistor R of unidirectional rectifying circuit 2 Rear AND filter capacitor C dc The positive electrode of the unidirectional rectification circuit is connected with the filter capacitor C dc The negative electrode of the resistor R 2 And controllable switch K 2 And are connected in parallel.
Further preferably, the detection process for judging whether the three-phase alternating-current voltage is input is as follows:
assuming that the system operates under the power supply condition of a single-phase alternating current power supply at the beginning, sampling any phase line voltage of three-phase alternating current input through a voltage sensor, and recording the sampling value as u bcs Judging instantaneous value u bcs Whether the absolute value of (2) is greater than a preset threshold value V 1th The method comprises the steps of carrying out a first treatment on the surface of the If instantaneous value u bcs Is greater than the threshold value V 1th Then a three-phase ac voltage input is indicated.
When the instantaneous value u bcs Is less than or equal to the threshold value V 1th At the time, u bcs Taking absolute value, performing sliding accumulation operation with the absolute value of the sampled N-1 instantaneous values, and recording the sliding accumulation sum of the absolute values of the N instantaneous values as u sum Judgment u sum Whether or not the preset threshold value V is exceeded th2， When the absolute values of the N sampling data slide and accumulate and u sum Exceeding the threshold value V th2 Indicating that there is a three-phase high voltage ac power supply on.
Further preferably, in each sampling period, the instantaneous sampling value u is calculated bcs Respectively, into two first low-pass filters F having different bandwidths lpl And a second low-pass filter F lph Will pass through a first low-pass filter F lpl Obtained u bcl Accumulating period by period and calculating average value as V LA Will pass through a second low pass filter F lph Obtained u bch Accumulating period by period and calculating average value as V HA The method comprises the steps of carrying out a first treatment on the surface of the By using the V obtained LA And V HA Obtaining a proportion coefficient R v ＝V LA /V HA R under normal conditions v <1。
Further preferably, when the three-phase ac voltage is applied, the DC/DC converter control amount u in the DC/DC converter circuit is set to m Multiplying by a scaling factor R v Then the three-phase alternating current voltage is sent into a DC/DC converter control system, and the DC/DC converter control quantity u is controlled under the condition that the sudden input of the three-phase alternating current voltage is not detected m Multiplied by 1 and fed into the DC/DC converter control system for duty cycle adjustment.
Further preferably, during the switching and stabilization of the three-phase ac power,V LA will gradually approach to be equal to V HA Thus, when the three-phase alternating current power is detected to be put into operation and is delayed for a period of time t d After that, the DC/DC converter control system is restored to the control signal u m And multiplying by 1, and then carrying out PWM modulation, namely, restoring the system to a normal operation state.
Further preferably, the DC/DC converter circuit outputs a voltage reference u oref And the actual output voltage u o Is fed into the voltage controller G v The control signal u is obtained by the operation m Under steady state condition, the DC/DC converter control system does not detect the sudden input of three-phase alternating current high voltage, and then the control signal u m Multiplying by 1 and then modulating with a high-frequency carrier wave CW to PWM signals; if the control system detects sudden input of three-phase alternating current high voltage, the DC/DC converter control system calculates a proportionality coefficient R for correction v Will control the signal u m And R is R v The multiplication is used for modulating with a high-frequency carrier CW and the like to a PWM signal.
Advantageous effects
1) The method for detecting whether the three-phase high-voltage alternating current power supply is put into operation or not by using one voltage sensor reduces the number of sensors and saves the cost.
2) The control method suitable for the high-power direct-current converter and not requiring high control bandwidth is provided, the design difficulty of a direct-current converter control system is reduced, and the rapidity is good.
3) Closing K by a control system at the end of power-on 1 R is R 1 Bypass, avoiding loss and voltage drop. Similarly, K is closed by the control system at the end of power-on 2 R is R 2 Bypass, avoiding loss and voltage drop.
4) The control system of the DC/DC converter circuit is used for accurately detecting the input of the high-voltage power supply, so that the negative influence of the sudden power supply impact on the output voltage or current dynamic control performance of the DC converter is inhibited, and the phenomena of overvoltage and overcurrent are avoided when the high-voltage power supply is suddenly input.
Drawings
Fig. 1 is a schematic diagram of the present application.
Fig. 2 is a schematic diagram of a single closed loop control system for a DC/DC converter circuit.
FIG. 3 is a graph showing the scaling factor R v Is a schematic diagram of the calculation method.
Detailed Description
The following detailed description is exemplary and is intended to provide further explanation of the application. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present application.
The topology of the dual input DC converter described in fig. 1 generally includes a three-phase half-bridge diode rectifier circuit, a single-phase full-bridge diode rectifier circuit, and a DC/DC converter circuit.
The input of the three-phase half-bridge diode rectifying circuit is connected with a three-phase alternating current power supply u a ，u b And u c The positive electrode of the rectification output is connected with a resistor R in series 1 Rear AND filter capacitor C dc The positive electrode A of the rectifier output is connected with the filter capacitor C dc Is a negative electrode B of (a). Resistor R 1 For limiting the surge current of three-phase ac power, associated with a controllable switch K 1 Parallel connection, and K is closed by a control system after power-on 1 R is R 1 Bypass, avoiding loss and voltage drop.
The input of the single-phase full-bridge diode rectifying circuit is connected with a single-phase alternating current power supply u e The positive electrode of the rectification output is connected with a resistor R in series 2 Rear AND filter capacitor C dc The positive electrode A of the rectifier output is connected with the filter capacitor C dc Is a negative electrode B of (a). Resistor R 2 For limiting the rush current of single-phase ac power, associated with a controllable switch K 2 Parallel connection, and K is closed by a control system after power-on 2 R is R 2 Bypass, avoiding loss and voltage drop.
In order to detect single-phase alternating voltage, a voltage sensor VS1 is arranged at the middle points of two bridge arms of the single-phase full-bridge diode rectifying circuit; to detect the three-phase ac voltage, any two phases of the three-phase legs (e.g., the midpoints of the b-phase legs and the c-phase legs in fig. 1) are selected, and a voltage sensor VS2 is disposed at the midpoints of the two-phase legs.
Normally, vdc1 is 0.9 times the input voltage of the unidirectional rectification single-path, and Vdc3 is 2.34 times the input voltage of the three-phase rectification circuit.
The DC/DC converter circuit of the subsequent stage may be in any circuit form of an isolated or non-isolated structure, such as a non-isolated Buck circuit, a Boost circuit, or a phase-shifted full-bridge converter circuit of an isolated structure.
The DC/DC converter circuit of the subsequent stage can adopt voltage single closed-loop control or voltage current double closed-loop control. Fig. 2 presents a schematic diagram of the voltage single closed loop control used to assist in explaining the main idea of the present patent. Will output a voltage reference value u in the figure oref And the actual output voltage u o Is fed into the voltage controller G v The control signal u is obtained by the operation m In steady state conditions, i.e. if the DC/DC converter control system does not detect a sudden input of a three-phase ac high voltage, the control signal u m Multiplying by 1 and then modulating with a high-frequency carrier wave CW to PWM signals; if the control system detects sudden input of three-phase alternating current high voltage, the DC/DC converter control system calculates a proportionality coefficient R for correction v Will control the signal u m And R is R v The multiplication is used for modulating with a high-frequency carrier CW and the like to a PWM signal.
The three-phase high-voltage alternating current burst detection and impact suppression method in the double-input direct current converter disclosed by the patent is as follows:
(1) It is assumed that the system is initially operated under single-phase ac power supply conditions. Sampling any one phase line voltage of the three-phase ac input by voltage sensor VS2 (e.g., u in fig. 1 bc ) The sampled value is noted as u bcs Judging instantaneous value u bcs Whether the absolute value of (2) exceeds a preset threshold value V 1th (e.g., average voltage of single-phase rectified output); if u bcs The absolute value of (2) exceeds V 1th Then a three-phase ac voltage input is indicated. Otherwise, it indicates that there is no three-phase alternating currentPressing and putting in;
(2) Based on the detection of (1), if it is determined that no three-phase ac voltage is applied, u is set bcs And taking absolute values of N-1 instantaneous values sampled before and after absolute values, and performing sliding accumulation operation. In order to ensure the real-time performance of detection, the time for continuously sampling N data should not be too long, for example, the sampling frequency may be controlled to be about 1ms, for example, 20kHz (corresponding to a sampling period of 50 μs), and the frequency of the three-phase ac power supply is 50Hz (corresponding to a period of 20 ms), so that 20 data can be sampled in 1 ms. The sliding accumulation is adopted to ensure that the calculation result meeting the real-time requirement can be quickly obtained in each sampling period. The sliding sum of N instantaneous absolute values is recorded as u sum ；
(3) Judging u sum Whether or not the preset threshold value V is exceeded th2 . Under normal conditions, if no three-phase high-voltage alternating current power supply is put into operation, the theoretical instantaneous sampling value should be 0, and in an actual system, the absolute value sliding accumulation of N sampling data should be smaller than the threshold value V due to interference caused by high-frequency PWM chopping of a power device in a DC/DC converter circuit th2 . And when the sum of the absolute value sliding sums of the N sampled data exceeds V th2 It is also possible to determine that there is a three-phase high-voltage ac power supply on. The method can avoid the defect that the method for calculating the voltage change rate by utilizing the sampling instantaneous value is easy to be interfered, and has the advantages of stability and reliability.
For the detection of the sudden input of the three-phase alternating current power supply, when only one voltage sensor is provided, whether the three-phase alternating current voltage is input or not is judged by combining the absolute value of the voltage instantaneous value with the sum of the absolute values of N-point sampling data in a short time (for example, 1 ms). Namely: on one hand, judging whether the absolute value of the sampling instantaneous value exceeds a preset threshold value V1th, and if so, judging that the three-phase alternating voltage is input; on the other hand, since one voltage sensor can detect only one phase voltage, it may occur that the voltage of the detected phase is very low (near the zero crossing point), but in reality the voltage of the other two phases is already high and exceeds the threshold Vth1, so that the input of the three-phase high-voltage ac power supply cannot be detected in time. Therefore, a detection method is proposed that takes absolute values of instantaneous values of multiple points (N data are sampled in 1 ms) in a short time and then carries out sliding accumulation, under normal conditions, as no three-phase high-voltage alternating-current power supply is put into operation, the theoretical sampling value should be 0, the high-frequency PWM chopping of a power device in an actual direct-current converter causes interference, the sliding accumulation sum of the absolute values of the N sampled data is smaller than a threshold value Vth2, and when the sliding accumulation sum of the absolute values of the N sampled data exceeds Vth2, the three-phase high-voltage alternating-current power supply is put into operation. Therefore, the method for obtaining the voltage change rate by utilizing the sampling instantaneous value can avoid the defect that the method is easy to be interfered, and has the advantages of stability and reliability.
(4) In each sampling period, the instantaneous sampling value u bcs The absolute values of (2) are respectively fed into a first low-pass filter F lpl And a second low-pass filter F lph The former F lpl Having a relatively low bandwidth (e.g. below 50 Hz) as a low bandwidth low pass filter, the latter F lph With a relatively high bandwidth (e.g. 3kHz, much higher than F) lpl And significantly lower than the switching frequency of the dc converter), as a high bandwidth low pass filter, will pass through F lpl Obtained u bcl Accumulating period by period and calculating average value as V LA Will pass through F lph Obtained u bch Accumulating period by period and calculating average value as V HA . With respect to V HA ，V LA Is a slow variable, and V HA The dynamic change of the rectification average value of the alternating voltage is better reflected. By using the V obtained LA And V HA Obtaining a proportion coefficient R v ＝V LA /V HA . Due to V LA Is a relatively slow variable, and is normally necessarily R v <1 is true;
when it is determined that the three-phase alternating-current voltage is applied by (1), (2) and (3), the DC/DC converter control amount u is calculated m Multiplying the ratio coefficient R obtained in (4) v And then the voltage is sent into a comparison register of a microprocessor of a DC/DC converter control system, so that quick response to abrupt change of input voltage is realized, and the aim of inhibiting voltage impact caused by abrupt input of a three-phase high-voltage alternating current power supply is fulfilled. Control of DC/DC converter in case of no sudden input of three-phase AC voltageu m Multiplied by 1 and then fed into a comparison register of a microprocessor of the DC/DC converter control system for duty cycle adjustment.
In the process of switching and stabilizing three-phase alternating current power supply in theory, V LA Will gradually approach to be equal to V HA Thus, when the three-phase alternating current power is detected to be put into operation and is delayed for a period of time t d After (e.g. a number of sine wave cycles, such as 100 ms) the control system reverts to the control signal u m And multiplying by 1, and then carrying out PWM modulation, namely, restoring the system to a normal operation state.
The above description is only of the preferred embodiments of the present application and is not intended to limit the present application, but various modifications and variations can be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.
Claims (6)
1. An alternating current power supply sudden-increase detection suppression system in a double-input direct current converter is characterized by comprising a three-phase rectifying circuit, a unidirectional rectifying circuit and a DC/DC converter circuit;
positive electrode series resistor R of three-phase rectifying circuit 1 Rear AND filter capacitor C dc The positive electrode of the three-phase rectifying circuit is connected with the filter capacitor C dc The negative electrode of the resistor R 1 And controllable switch K 1 Parallel connection; the filter capacitor C dc The positive and negative poles of (a) are respectively connected to the DC/DC converter circuit;
positive electrode series resistor R of unidirectional rectifying circuit 2 Rear AND filter capacitor C dc The positive electrode of the unidirectional rectification circuit is connected with the filter capacitor C dc The negative electrode of the resistor R 2 And controllable switch K 2 Parallel connection;
DC/DC converter circuit output voltage reference u oref And the actual output voltage u o Is fed into the voltage controller G v The control signal u is obtained by the operation m Under steady state conditions, the DC/DC converter control system does not detect three-phase high alternating currentSudden input of pressure, control signal u m Multiplying by 1 and then modulating with a high-frequency carrier wave CW to PWM signals; if the control system detects sudden input of three-phase alternating current high voltage, the DC/DC converter control system calculates a proportionality coefficient R for correction v Will control the signal u m And R is R v The multiplication is used for modulating with a high-frequency carrier CW and the like to a PWM signal.
2. The system for suppressing ac power supply surge detection in a dual input dc converter as defined in claim 1, wherein the detection process for determining whether a three-phase ac voltage input is present is:
assuming that the system operates under the power supply condition of a single-phase alternating current power supply at the beginning, sampling any phase line voltage of three-phase alternating current input through a voltage sensor, and recording the sampling value as u bcs Judging instantaneous value u bcs Whether the absolute value of (2) is greater than a preset threshold value V 1th The method comprises the steps of carrying out a first treatment on the surface of the If instantaneous value u bcs Is greater than the threshold value V 1th Then a three-phase ac voltage input is indicated.
3. The system for suppressing ac power supply burst detection in a dual input dc converter as set forth in claim 2, wherein the detection process for determining whether a three-phase ac voltage input is present is:
when the instantaneous value u bcs Is less than or equal to the threshold value V 1th At the time, u bcs Taking absolute value, performing sliding accumulation operation with the absolute value of the sampled N-1 instantaneous values, and recording the sliding accumulation sum of the absolute values of the N instantaneous values as u sum Judgment u sum Whether or not the preset threshold value V is exceeded th2， When the absolute values of the N sampling data slide and accumulate and u sum Exceeding the threshold value V th2 Indicating that there is a three-phase high voltage ac power supply on.
4. The ac power burst detection suppression system in a dual input dc converter as recited in claim 2, wherein in each sampling period, the instantaneous sampling value u is set to bcs Respectively, into two first low-pass filters F having different bandwidths lpl And a second low-pass filter F lph Will pass through a first low-pass filter F lpl Obtained u bcl Accumulating period by period and averagingV LA Will pass through a second low pass filter F lph Obtained u bch Accumulating period by period and averagingV HA The method comprises the steps of carrying out a first treatment on the surface of the By using the obtainedV LA AndV HA determining a scaling factorR v =V LA /V HA Under normal conditionsR v <1。
5. The system for suppressing sudden increase in AC power supply in a dual input DC converter as set forth in claim 4, wherein said control unit is configured to control said DC/DC converter in said DC/DC converter circuit by a control amount u when said three-phase AC voltage is applied m Multiplying by a scaling factorR v Then the three-phase alternating current voltage is sent into a DC/DC converter control system, and the DC/DC converter control quantity u is controlled under the condition that the sudden input of the three-phase alternating current voltage is not detected m Multiplied by 1 and fed into the DC/DC converter control system for duty cycle adjustment.
6. The system for suppressing sudden increase of AC power supply in a dual input DC converter as set forth in claim 4, wherein, during the switching and stabilization of the three-phase AC power supply,V LA will gradually approach to be equal toV HA Thus, when the three-phase alternating current power is detected to be put into operation and is delayed for a period of time t d After that, the DC/DC converter control system is restored to the control signal u m And multiplying by 1, and then carrying out PWM modulation, namely, restoring the system to a normal operation state.
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| CN112187065A (en) * | 2019-07-01 | 2021-01-05 | 中国石油化工股份有限公司 | Rectifying unit, device and system |
| CN112532034A (en) * | 2020-12-02 | 2021-03-19 | 广东交通职业技术学院 | Quasi-resonant switching power supply variable-frequency power supply control system and control method thereof |
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2021
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| JPH0746847A (en) * | 1993-07-30 | 1995-02-14 | Sanyo Denki Co Ltd | Three-phase rectifier |
| WO2014167727A1 (en) * | 2013-04-12 | 2014-10-16 | 三菱電機株式会社 | Power conversion device |
| CN104901522A (en) * | 2015-05-22 | 2015-09-09 | 中南大学 | Secondary pulse power decoupling closed-loop control method based on series compensation |
| WO2018070012A1 (en) * | 2016-10-13 | 2018-04-19 | 三菱電機株式会社 | Power conversion apparatus, motor drive control device, blower, compressor and air conditioner |
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| CN112532034A (en) * | 2020-12-02 | 2021-03-19 | 广东交通职业技术学院 | Quasi-resonant switching power supply variable-frequency power supply control system and control method thereof |
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