CN113098313A - Inversion feedback control circuit, control method and inverter - Google Patents

Inversion feedback control circuit, control method and inverter Download PDF

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Publication number
CN113098313A
CN113098313A CN202110365020.9A CN202110365020A CN113098313A CN 113098313 A CN113098313 A CN 113098313A CN 202110365020 A CN202110365020 A CN 202110365020A CN 113098313 A CN113098313 A CN 113098313A
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China
Prior art keywords
port
signal
control signal
voltage
inversion
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CN202110365020.9A
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Chinese (zh)
Inventor
林志坚
邹常铭
兰先求
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Huizhou Factory Jeckson Electric Co Ltd
Jeckson Electric Co Ltd
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Huizhou Factory Jeckson Electric Co Ltd
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Priority to CN202110365020.9A priority Critical patent/CN113098313A/en
Publication of CN113098313A publication Critical patent/CN113098313A/en
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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
    • 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
    • H02M7/53871—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 with automatic control of output voltage or 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
    • H02M1/32—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
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
    • H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements

Abstract

The application relates to an inversion feedback circuit, a control method and an inverter, wherein the current comprises: the sampling module is used for detecting the direct current input electric signal and generating a sampling signal; the control module is connected with the sampling module and used for receiving the sampling signal and generating a control signal according to the sampling signal; and the inversion module is connected with the control module and used for inverting the direct current input electric signal according to the received control signal and generating preset alternating current. The sampling module is used for acquiring input voltage and current signals of the front end at a high speed and feeding accurate feedback quantity back to the control module, so that the inversion process is adjusted by the control inversion module in real time, constant voltage and constant power are finally output by inversion, and meanwhile, the inversion process which originally needs two-stage control is simplified into one-stage control by the control module, the design cost of the inversion feedback circuit can be effectively reduced, and the cost performance and the concentration of the inversion feedback circuit are improved.

Description

Inversion feedback control circuit, control method and inverter
Technical Field
The invention relates to the technical field of power electronics, in particular to an inversion feedback circuit, a control method and an inverter.
Background
With the development of the lithium battery becoming mature, the inverter power supply using the battery is widely applied. PWM control is adopted as a control core of an inverter circuit, and the basic principle is as follows: the DC 12V voltage provided by the battery is converted into the AC voltage of 370V/50kHz by the high-frequency PWM switching power supply technology, and then the DC of 370V is converted into the AC of 220V/50Hz by the rectification, filtering, pulse width modulation and switching H full bridge circuit to be output for the electric equipment.
However, the conventional inverter technology adopts a primary and secondary feedback control mode to implement an inverter process, wherein a primary microprocessor reads a battery voltage, implements input over-voltage and under-voltage protection, and converts a direct current voltage provided by the battery into an alternating current voltage of 370V through a high-frequency PWM switching power supply technology; the secondary microprocessor converts 370V direct current into 220V/50Hz alternating current through a high-frequency SPWM switch H full bridge circuit for output, constant voltage output and over-voltage and under-voltage protection are realized by reading secondary output voltage, and short circuit protection and overload protection are realized by reading secondary sampling voltage.
However, the conventional primary and secondary feedback control method requires two microprocessor chips and associated driving devices, which not only increases chip overhead cost and hardware space requirement, but also requires additional information communication circuits for the primary and secondary microprocessor chips, and when the secondary is protected, the primary response is relatively slow, which is not favorable for stabilizing output voltage.
Disclosure of Invention
Accordingly, it is necessary to provide an inverter feedback control circuit, a control method and an inverter for solving the above problems in the background art, which simplify the circuit structure, reduce the equipment cost and improve the stability of the inverter control compared to the conventional inverter technology.
An aspect of the application provides an inversion feedback circuit, including sampling module, control module and contravariant module, sampling module is used for detecting the direct current input signal of telecommunication, and generates sampling signal, control module with sampling module connects for the receipt sampling signal, and basis sampling signal generates control signal, contravariant module with control module connects for according to receiving control signal, with direct current input signal of telecommunication contravariant processing, and generate and predetermine the alternating current.
In the inversion feedback control circuit in the above embodiment, the sampling module is used for acquiring the input voltage and the current signal of the front end at a high speed, and feeding back the accurate feedback quantity to the control module, so that the inversion process is adjusted by the control inversion module in real time, and the constant voltage and the constant power are finally output by inversion.
In one embodiment, the inverter module further includes an inverter bridge unit connected to the dc input electrical signal, the control module includes a microprocessor and a driving module connected to the microprocessor, wherein the control signal includes a driving control signal, and the microprocessor is further configured to: and generating a driving control signal according to the received sampling signal, and controlling the driving module to generate an inversion control signal so as to control the inversion bridge unit to invert the received preset voltage value and generate the preset alternating current.
In one embodiment, the sampling module includes a voltage sampling unit and a current sampling unit, the voltage sampling unit is connected to the dc input electrical signal and configured to obtain a dc input voltage and generate a voltage feedback signal according to the dc input voltage, the current sampling unit is connected to the dc input electrical signal and configured to obtain a dc input current and generate a current feedback signal according to the dc input current, the control signal further includes a boost control signal, the inverter module includes a dc boost unit, the inverter bridge unit is connected to the dc input electrical signal through the dc boost unit, the microprocessor is connected to the voltage sampling unit, the current sampling unit, and the dc boost unit, and the microprocessor is further configured to: and acquiring the voltage feedback signal and the current feedback signal, generating a boost control signal according to the voltage feedback signal and the current feedback signal, controlling the action of the direct current boost unit, and boosting the direct current input electric signal to a preset voltage value.
In one embodiment, the dc boost unit includes a boost transformer, a first switching tube, a second switching tube, a filter capacitor, and a rectifier bridge, and the boost transformer is configured to: turn ratio of NbusThe primary side comprises a first winding and a second winding sharing a first port, the first port is connected with the positive input end of the direct current input electric signal, and the first switch tube is configured to: the control port is connected with the microprocessor, the first port is connected with the second port of the first winding, and the second switch tube is configured to: the control port is connected with the microprocessor, the first port is connected with the second port of the second winding, and the second port of the first switching tube are both connected with the negative input end of the direct current input electric signal through the current sampling unit; the rectifier bridge is configured to: the first port is connected with the first port of the secondary side of the boosting transformer, the second port is connected with the first port of the inverter bridge unit, the third port is connected with the second port of the secondary side through the filter capacitor, and the fourth port is connected with the second port of the inverter bridge unit.
In one embodiment, the inverter bridge unit includes a third switching tube, a fourth switching tube, a fifth switching tube, and a sixth switching tube, and the third switching tube is configured to: the control port is connected with the driving module, the first port is connected with the second port of the rectifier bridge, and the fourth switching tube is configured to: a control port is connected with the control port of the third switching tube, a first port is connected with a second port of the third switching tube, a second port is connected with a fourth port of the rectifier bridge, and the fifth switching tube is configured to: the control port is connected with the driving module, and the first port is connected with the first port of the third switching tube; the sixth switching tube is configured to: the control port is connected with the control port of the fifth switch tube, the first port is connected with the second port of the fifth switch tube, and the second port is connected with the second port of the fourth switch tube.
In one embodiment, the boost control signal further comprises a first boost control signal, the microprocessor further configured to: and generating a first boost control signal according to the received voltage feedback signal and the current feedback signal, and controlling the first switching tube and/or the second switching tube to act so that the rectifier bridge outputs the preset voltage value.
In one embodiment, the boost control signal further comprises a first interrupt control signal and a second interrupt control signal, the microprocessor further configured to: acquiring the direct current feedback signal, converting the current feedback signal into corresponding feedback voltage, and if a circuit is short-circuited or the feedback voltage is greater than a first preset comparison voltage, generating a first interrupt control signal to control the turn-off of each switch in the direct current boosting unit so that the rectifier bridge stops outputting voltage; and if the feedback voltage is greater than a second preset comparison voltage, generating a second interrupt control signal to control each switch in the direct current boosting unit to be turned off until the next boosting control signal is recovered, wherein the second preset comparison voltage is greater than the first preset comparison voltage.
In one embodiment, the inverter control signal further comprises a power regulating inverter control signal, the microprocessor further configured to: obtaining the output power PoAnd the pulse width D of the inversion control signalon[n-1]According to said output power PoAnd output reference power PrefDetermining a power adjustment amount;
generating the power regulation inversion control signal based on the power regulation quantity to regulate the pulse width of the inversion control signal, wherein the pulse width of the inversion control signal is based on the following formula:
when P is present0Greater than PrefWhen D ison[n]＝Don[n-1]-ΔDon；
When P is present0Is equal to PrefWhen D ison[n]＝Don[n-1]；
When P is present0Less than PrefWhen D ison[n]＝Don[n-1]+ΔDon；
Wherein, Δ DonFor on-time adjustment compensation, Don[n]And generating the power regulation inversion control signal according to the power regulation quantity for the pulse width regulated by the inversion control signal, and controlling the on or off of a switch tube in the inversion bridge unit so that the inversion module outputs preset power.
In one embodiment, the inverter control signal comprises a voltage regulated inverter control signal, and the microprocessor is further configured to:
obtaining the voltage V of the preset alternating currentoAnd the pulse width D of the inversion control signalon[n-1]；
According to said voltage VoAnd a reference voltage VrefDetermining a voltage adjustment amount;
generating the voltage regulation inversion control signal based on the voltage regulation amount to regulate a pulse width of the inversion control signal, wherein the pulse width of the inversion control signal is based on the following equation:
when V isoGreater than VrefWhen D ison[n]＝Don[n-1]-ΔDon；
When V isoIs equal to VrefWhen D ison[n]＝Don[n-1]；
When V isoLess than VrefWhen D ison[n]＝Don[n-1]+ΔDon；
Wherein, Δ DonFor on-time adjustment compensation, Don[n]And generating the voltage regulation inversion control signal according to the voltage regulation quantity for the pulse width regulated by the inversion control signal, and controlling the on/off of a switch tube in the inversion bridge unit so that the inversion module outputs a preset voltage.
A second aspect of the present application provides an inverter including an inverter feedback control circuit as described in any of the embodiments of the present application, for converting an input dc power into a preset boost ac power.
In the inverter in the above embodiment, the sampling module is disposed at the front end of the inversion module to detect the dc input signal and generate the sampling signal, and the control module controls the inversion module to operate based on the sampling signal, so as to invert the dc input signal and generate the preset ac power. The method comprises the steps of acquiring input voltage and current signals of a front end at a high speed, and adopting a high-precision feedback processing technology to obtain accurate feedback quantity, so as to adjust an inversion control process and finally achieve the purpose of controlling and adjusting inversion output voltage and power; the control module is arranged to simplify the inversion process which originally needs two-stage control into one-stage control, so that the design cost of the inversion feedback circuit can be effectively reduced, and the cost performance and the concentration of the inversion feedback circuit are improved.
A third aspect of the present application provides an inversion feedback control method, including:
generating a boost control signal and an inversion control signal according to the voltage feedback signal and the current feedback signal;
and controlling the on or off of each switch in the direct current boosting unit based on the boosting control signal to enable the direct current boosting unit to boost the direct current input electric signal to a preset voltage value, and controlling the on or off of each switch in the inverter bridge unit based on the inversion control signal to enable the inverter bridge unit to invert the preset voltage value to generate preset alternating current.
In the inversion feedback control method in the above embodiment, the boost control signal and the inversion control signal are generated according to the voltage feedback signal and the current feedback signal; controlling the on or off of each switch in the direct current boosting unit based on the boosting control signal, and presetting a voltage value for a boosting value of a direct current input electric signal; and controlling the on-off of each switch in the inverter bridge unit based on the inversion control signal so as to control the inverter bridge unit to invert the received preset voltage value and generate the preset alternating current. According to the embodiment, the front-end direct current input feedback is adopted to adjust the inversion process, so that the sampling link is simplified, and the inversion efficiency is improved.
In one embodiment, the boost control signal comprises a first interrupt control signal and a second interrupt control signal;
generating a boost control signal according to the voltage feedback signal and the current feedback signal, comprising:
converting the current feedback signal into corresponding feedback voltage;
if the circuit is short-circuited or the feedback voltage is greater than a first preset comparison voltage, generating a first interrupt control signal to control the turn-off of each switch in the direct current boosting unit; and if the feedback voltage is greater than a second preset comparison voltage, generating a second interrupt control signal to control each switch in the direct current boosting unit to be turned off until the next boosting control signal is recovered, wherein the second preset comparison voltage is greater than the first preset comparison voltage.
In one embodiment, the inversion control signal comprises a power regulating inversion control signal;
generating an inversion control signal according to the voltage feedback signal and the current feedback signal, comprising:
calculating output power according to the voltage feedback signal and the current feedback signal;
and if the output power is not equal to the reference power, generating the success rate adjustment inversion control signal to control the on/off of each switching tube in the inverter unit, namely adjusting the pulse width of the inversion control signal, so that the inversion module outputs preset power.
In one embodiment, the inversion control signal further comprises a voltage regulated inversion control signal;
generating an inversion control signal according to the voltage feedback signal and the current feedback signal, comprising:
calculating output voltage according to the voltage feedback signal and the current feedback signal;
if the output voltage is not equal to the reference voltage, a voltage regulation inversion control signal is generated to control the on/off of each switching tube in the inverter unit, that is, the pulse width of the inversion control signal is regulated, so that the inversion module outputs a preset alternating current.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain drawings of other embodiments based on these drawings without any creative effort.
Fig. 1 is a schematic diagram of an inverter feedback control circuit according to a first embodiment of the present disclosure;
fig. 2 is a schematic diagram of an inverter feedback control circuit according to a second embodiment of the present application;
fig. 3 is a schematic diagram of an inverter feedback control circuit according to a third embodiment of the present application;
fig. 4 is a schematic diagram of an inverter feedback control circuit according to a fourth embodiment of the present disclosure;
fig. 5 is a schematic diagram of an inverter feedback control circuit according to a fifth embodiment of the present application;
fig. 6 is a schematic diagram of an inverter feedback control circuit according to a sixth embodiment of the present application;
FIG. 7a is a schematic diagram of a boost control circuit according to an embodiment of the present application;
FIG. 7b is a schematic diagram of a boost control circuit according to another embodiment of the present application;
fig. 8 is a schematic diagram of an inverter feedback control circuit provided in a seventh embodiment of the present application;
fig. 9a is a schematic diagram of an inverter control circuit according to an embodiment of the present application;
fig. 9b is a schematic diagram of an inverter control circuit according to another embodiment of the present application;
fig. 10 is a schematic diagram of an inverter feedback control circuit according to an eighth embodiment of the present application;
fig. 11 is a flowchart of an inversion feedback control method according to an embodiment of the present application;
fig. 12 is a flowchart of an inversion feedback control method according to another embodiment of the present application;
fig. 13 is a flowchart of an inversion feedback control method according to another embodiment of the present application;
fig. 14 is a flowchart of an inversion feedback control method according to still another embodiment of the present application.
Detailed Description
To facilitate an understanding of the present application, the present application will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present application are illustrated in the accompanying drawings. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
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. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Where the terms "comprising," "having," and "including" are used herein, another element may be added unless an explicit limitation is used, such as "only," "consisting of … …," etc. Unless mentioned to the contrary, terms in the singular may include the plural and are not to be construed as being one in number.
It will be understood that, although the terms first, second, etc. may be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. For example, a first element could be termed a second element, and, similarly, a second element could be termed a first element, without departing from the scope of the present application.
In this application, unless otherwise expressly stated or limited, the terms "connected" and "connecting" are used broadly and encompass, for example, direct connection, indirect connection via an intermediary, communication between two elements, or interaction between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
Referring to fig. 1, in an embodiment of the present application, an inversion feedback control circuit 100 is provided, which includes a sampling module 10, a control module 20, and an inversion module 30, where the sampling module 10 is configured to detect a dc input electrical signal and generate a sampling signal; the control module 20 is connected with the sampling module 10, and is configured to receive the sampling signal and generate a control signal according to the sampling signal; the inversion module 30 is connected to the control module 20, and configured to invert the dc input electrical signal according to the received control signal, and generate a preset ac power.
Specifically, in the inverter feedback control circuit in the above embodiment, the sampling module 10 collects the input voltage and the current signal at the front end at a high speed, so as to feed back the accurate feedback amount to the control module 20, thereby controlling the inverter module 30 to adjust the inverter process in real time, and finally realizing the inverter output constant voltage and constant power, and meanwhile, the inverter process originally requiring two-stage control is simplified into one-stage control by setting the control module, so that the design cost of the inverter feedback circuit can be effectively reduced, and the cost performance and the concentration of the inverter feedback circuit are improved.
Further, referring to fig. 2, in an embodiment of the present application, the inverter module 30 further includes an inverter bridge unit 31, where the inverter bridge unit 31 is connected to the dc input electrical signal; the control module 20 comprises a microprocessor 21 and a driving module 22 connected with the microprocessor 21; the control signal further includes a driving control signal, which controls the driving module 22 to generate an inversion control signal to control the inversion bridge unit 31 to invert the received preset voltage value to generate the preset alternating current.
Specifically, in the inverter feedback control circuit in the above embodiment, by setting the driving module 22, the microprocessor 21 is connected to the inverter bridge unit 31 via the driving module 22, and controls the inverter bridge unit 31 to invert the dc input electrical signal to generate the preset ac power, wherein the microprocessor 21 may include, but is not limited to, a DSP, an MCU or other high-speed computing device, and controls the driving module to send a driving signal through the microprocessor, so as to drive the inverter bridge unit to operate, thereby preventing interference in the driving process, and implementing accurate inverter control.
Further, referring to fig. 3, in an embodiment of the present application, the sampling module 10 includes a voltage sampling unit 11 and a current sampling unit 12, where the voltage sampling unit 11 is connected to the dc input electrical signal and is configured to obtain a dc input voltage and generate a voltage feedback signal according to the dc input voltage; the current sampling unit 12 is connected to the dc input electrical signal, and is configured to obtain a dc input current and generate a current feedback signal according to the dc input current; wherein, control signal includes the control signal that steps up, and contravariant module 30 includes direct current unit 32 that steps up, contravariant bridge unit 31 is connected with direct current input signal through direct current unit 32 that steps up, and control signal includes the control signal that steps up, and microprocessor 21 all is connected with voltage sampling unit 11, current sampling unit 12 and direct current unit 32 that steps up, microprocessor 21 still is configured as: and acquiring the voltage feedback signal and the current feedback signal, generating a boost control signal according to the voltage feedback signal and the current feedback signal, controlling the direct current boost unit 32 to act, and boosting the direct current input electric signal to a preset voltage value.
Specifically, referring to fig. 3 and 4, the sampling module 10 includes a voltage sampling unit 11 and a current sampling unit 12, and is respectively connected to the dc input electrical signal for obtaining the dc input electrical signal and generating a feedback signal, and the dc boost module 32 is arranged, so that the microprocessor 21 generates a boost control signal after obtaining the feedback signal, controls the dc boost unit 32 to act, and boosts the dc input electrical signal to a preset voltage value. As shown in fig. 4, the voltage sampling feedback unit 11 may be composed of a resistor divider or an amplifier, and the like, where the voltage sampling feedback unit 11 includes a resistor R1 and a resistor R2, one end of the resistor R1 is connected to the dc boost unit 32 and the positive input end of the dc input electrical signal, the other end of the resistor R1 is connected to one end of the resistor R2 and the microprocessor 21, the other end of the resistor R2 is connected to the current sampling unit 12 and the negative input end of the dc input electrical signal, and the dc input voltage is converted into a proper voltage signal according to a certain proportion and transmitted to the microprocessor 21 through the voltage dividing effect of the resistor R1 and the resistor R2, and the microprocessor 21 performs analysis and calculation on the voltage signal and controls the output voltage after digital compensation; the current sampling feedback unit 12 converts the input current into a suitable voltage signal and transmits the voltage signal to the microprocessor 21, and the microprocessor 21 analyzes and calculates the voltage signal and controls the output current and the output power after digital compensation.
Further, referring to fig. 5, in an example of the present application, the dc boost unit 32 includes a boost transformer T1, a first switch Q1, a second switch Q2, a filter capacitor C1, a filter capacitor C2, and a rectifier bridge 321; wherein the step-up transformer T1 is configured to: turn ratio of NbusThe primary side comprises a first winding and a second winding which share a first port (B), and the first port (B) is connected with the positive input end of a direct-current input electric signal; the first switching tube Q1 is configured to: the control port is connected with the microprocessor 21, and the first port is connected with the second port (end A) of the first winding; the second switching tube Q2 is configured to: the control port is connected with the microprocessor 21, and the first port is connected with the second port (end C) of the second winding; the second port and the second port of the first switching tube Q1 are both connected with the negative input end of the direct current input electrical signal through a current sampling unit, specifically, the first switching tube and the second switching tube may be field control switching elements such as MOSFET, IGBT, etc., the first port of the first switching tube and the second port of the second switching tube are collectors, and the second port of the first switching tube and the second port of the second switching tube are emitters; the rectifier bridge 321 is configured to: the first port is connected with the first port of the secondary side of the step-up transformer T1, the second port and one port of the filter capacitor C2 are connected with the first port of the inverter bridge unit, the third port is connected with the second port of the secondary side of the step-up transformer T1 through the filter capacitor C1, and the fourth port and the other port of the filter capacitor C2 are connected with the second port of the inverter bridge unit 31;
further, referring to fig. 6, in an embodiment of the present application, the rectifier bridge 321 includes a first diode D1, a second diode D2, a third diode D3 and a fourth diode D4, wherein an anode of the first diode D1 and a cathode of the fourth diode D4 are connected to a first port of a secondary side of the step-up transformer T1, a cathode of the first diode D1 and a cathode of the second diode D2 are connected to a first port of the inverter bridge unit 31, an anode of the second diode D2, a cathode of the third diode D3 and a first port of the filter capacitor C1 are connected, and an anode of the third diode D3 and an anode of the fourth diode D4 are connected to a second port of the inverter bridge unit 31.
Further, in one embodiment of the present application, the boost control signal comprises a first boost control signal, the microprocessor further configured to: according to the received voltage feedback signal and current feedback signal, a first boost control signal is generated to control the first switch Q1 and/or the second switch Q2 to operate, so that the rectifier bridge 321 outputs a preset voltage value.
Specifically, the first boost control signal is a high-frequency Pulse Width Modulation (PWM) signal including a PWM1 signal and a PWM2 signal complementary to the PWM1 signal, referring to fig. 7a, when the PWM1 signal controls the first switching tube Q1 to be turned on, the PWM2 signal controls the second switching tube Q2 to be turned off, the dc input electrical signal is boosted to the boost voltage of the upper half period through the first switching tube Q1 and the first winding of the boost transformer, and is rectified to the dc bus voltage through the action of the second diode D2, the fourth diode D4 and the filter capacitors C1 and C2 of the rectifier bridge; referring to fig. 7b, when the PWM1 signal controls the first switch Q1 to turn off, the PWM2 signal controls the second switch Q2 to turn on, and the dc input signal is boosted to the boost voltage of the next half period through the second switch Q2 and the second winding of the step-up transformer, and rectified to the dc bus voltage through the rectifier bridge, the first diode D1, the third diode D3, and the filter capacitors C1 and C2. The direct current input electrical signal generates boost alternating current under the action of the microprocessor 21, the first switch tube Q1, the second switch tube Q2 and the boost transformer T1, the boost alternating current generates direct current input electrical signal V under the rectification action of the rectifier bridge 321oBoosted to DC bus voltage VbusWherein V isbus＝Nbus×Vo，NbusIs the turn ratio of the step-up transformer. By arranging the microprocessor 21, a high-frequency PWM signal is output to control the connection or disconnection of the first switch tube and the second switch tube, so that the bus voltage is controlled, and the protection function is realized.
Further, in an example of the present application, the boost control signal further includes a first interrupt control signal and a second interrupt control signal, and the microprocessor is further configured to: obtaining a DC current feedback signal IsFeeding back a direct current to a signal IsIs converted into a corresponding feedback voltage VsWhen the circuit is short-circuited or the feedback voltage V is generatedsGreater than a predetermined comparison voltage V1At this time, the microprocessor 21 generates a first interrupt signal to control the first switch tube Q1 and the second switch tube Q2 to be turned off; when the feedback voltage VsGreater than a predetermined comparison voltage V2And the microprocessor generates a second interrupt signal to control the first switching tube and the second switching tube to be switched off until the next boosting control signal is recovered, and the second preset comparison voltage V is2Is greater than the first preset comparison voltage V1。
Specifically, the microprocessor sets the negative terminal voltage V of two paths of comparators in the internal digital-to-analog converter1And V2In which V is2Greater than V1Direct current IsIs sampled by the feedback signal Vs(the current sampling feedback unit converts the flowing current into voltage) is connected to the positive end of a comparator, and when a short circuit or V occurssGreater than a set value V1When the short-circuit protection is carried out, the comparator generates an interrupt signal, the microprocessor generates a first interrupt signal, the first switch tube and the second switch tube are controlled to be turned off, and the brake is carried out in time, so that the short-circuit protection is realized; when V issGreater than a set value V2When the first switch tube and the second switch tube are turned off, the comparator generates an interrupt signal, the microprocessor generates a second interrupt signal, the microprocessor brakes in time, turns off the PWM signal for one period, namely, controls the time of the first switch tube and the second switch tube for one period, and recovers the PWM signal after the next period, namely, recovers the first switch tube and/or the second switch tubeAnd (5) closing the pipe. The maximum input current is limited by controlling the turn-off and the recovery of the PWM signals, the maximum output power is limited at the same time, and when the turn-off of the PWM signals is accumulated to a certain amount, the PWM is completely turned off, so that the overload protection is realized.
Further, referring to fig. 8, in an example of the present application, the inverter bridge unit 31 includes a third switching tube Q3, a fourth switching tube Q4, a fifth switching tube Q5, and a sixth switching tube Q6, wherein the third switching tube Q3 is configured to: the control port is connected with the driving module 22, and the first port is connected with the second port of the rectifier bridge 321; the fourth switching tube Q4 is configured to: a control port is connected with a control port of the third switching tube Q3, a first port is connected with a second port of the third switching tube Q3, and the second port is connected with a fourth port of the rectifier bridge 321; the fifth switching tube Q5 is configured to: the control port is connected with the driving module 22, and the first port is connected with the first port of the third switching tube Q3; the sixth switching tube Q6 is configured to: the control port is connected with the control port of the fifth switching tube Q5, the first port is connected with the second port of the fifth switching tube Q5, and the second port is connected with the second port of the fourth switching tube Q4, specifically, the first switching tube and the second switching tube may be field control switching elements such as MOSFETs and IGBTs, the first ports of the first switching tube and the second switching tube are collectors, and the second ports are emitters.
Further, in one example of the present application, the microprocessor 21 is configured to: and generating a driving control signal according to the received sampling signal, and controlling the driving module to generate an inversion control signal so as to control the inversion bridge unit 31 to invert the received preset voltage value and generate the preset alternating current.
Specifically, the driving control signal is a high-frequency pulse width modulation (APWM) signal comprising a PWM1 signal and an APWM2 signal complementary to an APWM1 signal, and the inversion control signal is a high-frequency pulse width modulation (SPWM) signal comprising a SWM1 signal and an SPWM2 signal complementary to an SPWM1 signal; the pulse width time duty ratios of the APWM signals and the SPWM signals are arranged according to a sine rule, and the preset voltage value is inverted and processed by controlling the switches of the third switching tube Q3, the fourth switching tube Q4, the fifth switching tube Q5 and the sixth switching tube Q6 to be switched on or switched off, so that the preset alternating current is generated. Referring to fig. 9a, to obtain the first half cycle alternating current, the switches of the third switch Q3 and the sixth switch Q6 may be controlled to be turned on, and the switches of the fourth switch Q4 and the fifth switch Q5 may be controlled to be turned off; referring to fig. 9b, to obtain the next half-cycle alternating current, the switches of the fourth switching tube Q4 and the fifth switching tube Q5 may be controlled to be turned on, and the switches of the third switching tube Q3 and the sixth switching tube Q6 may be controlled to be turned off; thereby obtaining the preset alternating current.
Further, with continuing reference to fig. 8, in an example of the present application, the inverse bridge unit 31 further includes a filtering unit 311 configured to: the first port is connected with the second port of the third switching tube Q3 and the first port of the fourth switching tube Q4, the second port is connected with the second port of the fifth switching tube Q5 and the first port of the sixth switching tube Q6, and the third port and the fourth port are ac output ports respectively.
Further, referring to fig. 10, in an example of the present application, the filter unit 311 further includes a filter inductor L1 and a filter capacitor C3, one end of the filter inductor L1 is connected to the second port of the third switch Q3 and the first port of the fourth switch Q4, the other end of the filter inductor L1 is connected to one end of the second filter capacitor C3 and one end of the output voltage signal, and the other end of the filter capacitor C3 is connected to the second port of the fifth switch Q5, the first port of the sixth switch Q6 and the other end of the output voltage signal.
Further, in one example of the present application, the dc input electrical signal comprises a dc input voltage signal VinAnd a DC input current signal IsThe inverter control signal further comprises a power regulating inverter control signal, the microprocessor further configured to: according to the DC input voltage signal VinAnd said direct current input current signal IsCalculating the input power and the corresponding output power as follows:
calculating the input power P at the sampling momentinIn which P isin＝Vin×Is；
Obtaining the inverted high frequency pulsePrevious period T of width modulation PWM signal2And the on time D of the cycle duty ratioon[n-1]Specifically, the duty ratio on-time of the output high-frequency pulse width modulation PWM signal is calculated according to a sine wave calculation formula: sine wave calculation with half of the period of the alternating current output as 1 calculation unit, for example, with 180 ° as one calculation unit, dividing 180 ° into M equal divisions, each equal division corresponding to an integral PWM, the high frequency pulse width modulation PWM signal having a pulse width D according to the sine wave calculation formulaonWherein D ison＝K×sin(α/M×π)；α∈[0，M]Where K is the output voltage regulation coefficient, and α represents the arrangement number of M equal divisions, belonging to [0, M]Collecting;
calculating input power PiWherein
Figure BDA0003003343260000151
Calculating power of corresponding output
Figure BDA0003003343260000152
Wherein η is the efficiency conversion ratio;
by the power P to be outputoAnd a preset reference power PrefComparing and calculating to determine a power adjustment amount; generating the voltage regulation inversion control signal according to the power regulation quantity, and regulating the pulse width D of the inversion control signal by controlling the on or off of a switching tube in the inversion bridge unitonSpecifically, the pulse width of the inversion control signal is based on the following equation:
when P is present0Greater than PrefWhen D ison[n]＝Don[n-1]-ΔDon；
When P is present0Is equal to PrefWhen D ison[n]＝Don[n-1]；
When P is present0Less than PrefWhen D ison[n]＝Don[n-1]+ΔDon；
Wherein, Δ DonFor pulse-on-time adjustment compensation, Don[n]Pulse width adjusted for the inversion control signal. And generating the power regulation inversion control signal according to the power regulation quantity, and controlling the on/off of a switching tube in the inversion bridge unit so that the inversion module outputs preset power.
Further, in one example of the present application, the inverter control signal further comprises a voltage regulating inverter control signal, the microprocessor further configured to: obtaining the voltage V of the preset alternating currentoAnd the pulse width D of the inversion control signalon[n-1]In the case of a liquid crystal display device, in particular,
Figure BDA0003003343260000161
wherein K is an adjustment coefficient, M is a preset period equal part value, and N isbusThe turn ratio of the step-up transformer is obtained;
according to said voltage VoAnd a reference voltage VrefDetermining a voltage adjustment amount;
by passing the output AC voltage VoAnd a preset reference voltage VrefComparing and operating to determine the voltage regulating quantity; generating the voltage regulation inversion control signal according to the voltage regulation quantity, and controlling the on-off of a switching tube in the inversion bridge unit to regulate the pulse width D of the inversion control signalonSpecifically, the pulse width of the inversion control signal is based on the following equation:
when V isoGreater than VrefWhen D ison[n]＝Don[n-1]-ΔDon；
When V isoIs equal to VrefWhen D ison[n]＝Don[n-1]；
When V isoLess than VrefWhen D ison[n]＝Don[n-1]+ΔDon；
Wherein, Δ DonFor on-time adjustment compensation, Don[n]And generating the voltage regulation inversion control signal according to the voltage regulation quantity for the pulse width regulated by the inversion control signal, and controlling the on/off of a switch tube in the inversion bridge unit so that the inversion module outputs a preset voltage.
Further, in an example of the present application, there is provided an inverter including an inverter feedback control circuit as described in any of the embodiments of the present application, for converting an input dc power into a preset boost ac power.
Specifically, in the inverter in the above embodiment, the sampling module is arranged at the front end to detect the dc input signal and generate the sampling signal, and the control module controls the operation of the inversion module based on the sampling signal to invert the dc input electrical signal and generate the preset ac power; the method comprises the steps of acquiring input voltage and current signals of a front end at a high speed, and adopting a high-precision feedback processing technology to obtain accurate feedback quantity, so as to adjust an inversion control process and finally achieve the purpose of controlling and adjusting inversion output voltage and power; the control module is arranged to simplify the inversion process which originally needs two-stage control into one-stage control, so that the design cost of the inversion feedback circuit can be effectively reduced, and the cost performance and the concentration of the inversion feedback circuit are improved.
Further, referring to fig. 11, an embodiment of the present application provides an inversion feedback control method, including:
step 202: generating a boost control signal and an inversion control signal according to the voltage feedback signal and the current feedback signal;
step 204: and controlling the on and off of each switch in the direct current boosting unit based on the boosting control signal to enable the direct current boosting unit to boost the direct current input electric signal to a preset voltage value, and controlling the on and off of each switch in the inverter bridge unit based on the inversion control signal to enable the inverter bridge unit to invert the preset voltage value to generate preset alternating current.
Specifically, in the inverter feedback control method in the above embodiment, the boost control signal and the inverter control signal are generated according to the voltage feedback signal and the current feedback signal; controlling the on or off of each switch in the direct current boosting unit based on the boosting control signal, and presetting a voltage value for a boosting value of a direct current input electric signal; and controlling the on or off of each switch in the inverter bridge unit based on the inversion control signal so as to control the inverter bridge unit to invert the received preset voltage value and generate the preset alternating current. According to the embodiment, the front-end direct current input feedback is adopted to adjust the inversion process, so that the sampling link is simplified, and the inversion efficiency is improved.
Further, referring to fig. 12, in an example of the present application, the generating the boost control signal according to the voltage feedback signal and the current feedback signal includes:
step 2021: converting the current feedback signal into corresponding feedback voltage;
step 2041: if the circuit is short-circuited or the feedback voltage is greater than a first preset comparison voltage, generating a first interrupt control signal to control the turn-off of each switch in the direct current boosting unit; and if the feedback voltage is greater than a second preset comparison voltage, generating a second interrupt control signal to control each switch in the direct current boosting unit to be turned off until the next boosting control signal is recovered, wherein the second preset comparison voltage is greater than the first preset comparison voltage.
Specifically, by setting the first preset comparison voltage and the second preset comparison voltage, when the feedback voltage exceeds the preset comparison voltage, the direct current boosting unit is controlled to act so as to prevent the circuit from faults such as short circuit or overlarge current, and the short circuit protection and overload protection functions of the inverter circuit are learned.
Further, referring to fig. 13, in an example of the present application, the generating the inversion control signal according to the voltage feedback signal and the current feedback signal includes:
step 2022: calculating output power according to the voltage feedback signal and the current feedback signal;
step 2042: and if the output power is not equal to the reference power, generating the success rate adjustment inversion control signal to control the on/off of each switching tube in the inversion bridge unit, namely adjusting the pulse width of the inversion control signal, so that the inversion module outputs preset power.
Specifically, by setting the reference power, when the calculated output power is greater than or less than the voltage reference power, the inverter bridge unit is controlled to act, and the pulse width of the inverter control signal is adjusted, so that the constant power output of the inverter circuit is realized.
Further, referring to fig. 14, in an example of the present application, the inverting control signal further includes a voltage-regulating inverting control signal, and the generating the inverting control signal according to the voltage feedback signal and the current feedback signal includes:
step 2023: calculating output voltage according to the voltage feedback signal and the current feedback signal;
step 2043: if the output voltage is not equal to the reference voltage, a voltage regulation inversion control signal is generated to control the on/off of each switching tube in the inverter unit, that is, the pulse width of the inversion control signal is regulated, so that the inversion module outputs a preset alternating current.
Specifically, by setting the reference voltage, when the output voltage is not equal to the reference voltage, the inverter bridge unit is controlled to act, and the pulse width of the inverter control signal is adjusted, so that the constant voltage output of the inverter circuit is realized.
It should be understood that the steps described are not to be performed in the exact order recited, and that the steps may be performed in other orders, unless explicitly stated otherwise. Moreover, at least some of the steps described may include multiple sub-steps or multiple stages that are not necessarily performed at the same time, but may be performed at different times, and the order of performing the sub-steps or stages is not necessarily sequential, but may be performed alternately or in alternation with other steps or at least some of the sub-steps or stages of other steps.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by hardware instructions of a computer program, which can be stored in a non-volatile computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. Any reference to memory, storage, database, or other medium used in the embodiments provided herein may include non-volatile and/or volatile memory, among others. Non-volatile memory can include read-only memory (ROM), Programmable ROM (PROM), Electrically Programmable ROM (EPROM), Electrically Erasable Programmable ROM (EEPROM), or flash memory. Volatile memory can include Random Access Memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in a variety of forms such as Static RAM (SRAM), Dynamic RAM (DRAM), Synchronous DRAM (SDRAM), Double Data Rate SDRAM (DDRSDRAM), Enhanced SDRAM (ESDRAM), Synchronous Link DRAM (SLDRAM), Rambus Direct RAM (RDRAM), direct bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM).
It should be noted that the above-mentioned embodiments are only for illustrative purposes and are not meant to limit the present invention.
The embodiments in the present specification are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the claims. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (10)

1. An inverter feedback control circuit, comprising:
the sampling module is used for detecting the direct current input electric signal and generating a sampling signal;
the control module is connected with the sampling module and used for receiving the sampling signal and generating a control signal according to the sampling signal;
and the inversion module is connected with the control module and used for inverting the direct current input electric signal according to the received control signal and generating preset alternating current.
2. The circuit of claim 1, wherein the inverter module further comprises:
the inverter bridge unit is connected with the direct current input electric signal;
the control module comprises a microprocessor and a driving module connected with the microprocessor;
wherein the control signal comprises a drive control signal, the microprocessor further configured to:
and generating a driving control signal according to the received sampling signal, and controlling the driving module to generate an inversion control signal so as to control the inversion bridge unit to invert the received preset voltage value and generate the preset alternating current.
3. The circuit of claim 2, wherein the sampling module comprises:
the voltage sampling unit is connected with the direct current input electric signal and used for acquiring direct current input voltage and generating a voltage feedback signal according to the direct current input voltage;
the current sampling unit is connected with the direct current input electric signal and used for acquiring direct current input current and generating a current feedback signal according to the direct current input current;
wherein the control signal further comprises a boost control signal, the inverter module comprises a dc boost unit, the inverter bridge unit is connected to the dc input electrical signal via the dc boost unit, the microprocessor is connected to the voltage sampling unit, the current sampling unit and the dc boost unit, and the microprocessor is further configured to:
acquiring the voltage feedback signal and the current feedback signal;
and generating a boost control signal according to the voltage feedback signal and the current feedback signal, controlling the direct current boost unit to act, and boosting the direct current input electric signal to a preset voltage value.
4. The circuit of claim 3, wherein the DC boost unit comprises:
a step-up transformer configured to: turn ratio of NbusThe primary side comprises a first winding and a second winding sharing a first port, and the first port is connected with the positive input end of the direct current input electric signal;
a first switching tube configured to: the control port is connected with the microprocessor, and the first port is connected with the second port of the first winding;
a second switching tube configured to: the control port is connected with the microprocessor, the first port is connected with the second port of the second winding, and the second port of the first switching tube are both connected with the negative input end of the direct current input electric signal through the current sampling unit;
a filter capacitor;
a rectifier bridge configured to: the first port is connected with the first port of the secondary side of the boosting transformer, the second port is connected with the first port of the inverter bridge unit, the third port is connected with the second port of the secondary side through the filter capacitor, and the fourth port is connected with the second port of the inverter bridge unit.
5. The circuit of claim 4, wherein the inverter bridge unit comprises:
a third switching tube configured to: the control port is connected with the driving module, and the first port is connected with the second port of the rectifier bridge;
a fourth switching tube configured to: a control port is connected with a control port of the third switching tube, a first port is connected with a second port of the third switching tube, and the second port is connected with a fourth port of the rectifier bridge;
a fifth switching tube configured to: the control port is connected with the driving module, and the first port is connected with the first port of the third switching tube;
a sixth switching tube configured to: the control port is connected with the control port of the fifth switch tube, the first port is connected with the second port of the fifth switch tube, and the second port is connected with the second port of the fourth switch tube.
6. The circuit of claim 4 or 5, wherein the boost control signal further comprises a first boost control signal, the microprocessor further configured to:
and generating a first boost control signal according to the received voltage feedback signal and the current feedback signal, and controlling the first switching tube and/or the second switching tube to act so that the rectifier bridge outputs the preset voltage value.
7. The circuit of claim 4 or 5, wherein the inverter control signal further comprises a power regulating inverter control signal, the microprocessor further configured to:
obtaining the output power PoAnd the pulse width D of the inversion control signalon[n-1]；
According to the output power PoAnd output reference power PrefDetermining a power adjustment amount;
generating the power regulation inversion control signal based on the power regulation quantity to regulate the pulse width of the inversion control signal, wherein the pulse width of the inversion control signal is based on the following formula:
when P is present0Greater than PrefWhen D ison[n]＝Don[n-1]-ΔDon；
When P is present0Is equal to PrefWhen D ison[n]＝Don[n-1]；
When P is present0Less than PrefWhen D ison[n]＝Don[n-1]+ΔDon；
Wherein, Δ DonFor on-time adjustment compensation, Don[n]And adjusting the pulse width of the inversion control signal.
8. The circuit of claim 7, wherein the inverter control signal further comprises a voltage regulated inverter control signal, the microprocessor further configured to:
obtaining the voltage V of the preset alternating currentoAnd the pulse width D of the inversion control signalon[n-1]；
According to said voltage VoAnd a reference voltage VrefDetermining a voltage adjustment amount;
generating the voltage regulation inversion control signal based on the voltage regulation amount to regulate a pulse width of the inversion control signal, wherein the pulse width of the inversion control signal is based on the following equation:
when V isoGreater than Vr efWhen D ison[n]＝Don[n-1]-ΔDon；
When V isoIs equal to VrefWhen D ison[n]＝Don[n-1]；
When V isoLess than VrefWhen D ison[n]＝Don[n-1]+ΔDon；
Wherein, Δ DonFor on-time adjustment compensation, Don[n]And adjusting the pulse width of the inversion control signal.
9. An inverter, comprising:
the circuit of any of claims 1-8.
10. An inversion feedback control method, comprising:
generating a boost control signal and an inversion control signal according to the voltage feedback signal and the current feedback signal;
and controlling the on or off of each switch in the direct current boosting unit based on the boosting control signal to enable the direct current boosting unit to boost the direct current input electric signal to a preset voltage value, and controlling the on or off of each switch in the inverter bridge unit based on the inversion control signal to enable the inverter bridge unit to invert the preset voltage value to generate preset alternating current.
CN202110365020.9A 2021-04-01 2021-04-01 Inversion feedback control circuit, control method and inverter Pending CN113098313A (en)

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