CN107425726B

CN107425726B - A kind of circuit of reversed excitation

Info

Publication number: CN107425726B
Application number: CN201710357438.9A
Authority: CN
Inventors: 高拥兵; 朱建新; 陈信强
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Digital Power Technologies Co Ltd
Priority date: 2017-05-19
Filing date: 2017-05-19
Publication date: 2019-11-12
Anticipated expiration: 2037-05-19
Also published as: CN107425726A

Abstract

The embodiment of the present application discloses a kind of circuit of reversed excitation, for reducing the switching loss of the metal-oxide-semiconductor in the auxiliary source circuit of DC.Circuit of reversed excitation includes: the auxiliary source circuit of DC, the auxiliary source circuit of AC in the embodiment of the present application；The auxiliary source circuit of DC includes the first plant-grid connection mouth, the first primary side winding, first capacitor, the first metal-oxide-semiconductor, first diode and first object resistance；It is connected after first capacitor and the first metal-oxide-semiconductor are in parallel with the first plant-grid connection mouth；First metal-oxide-semiconductor, the first primary side winding and first diode are connected after being sequentially connected in series with the first plant-grid connection mouth；It connects after first object resistance is in parallel with first diode with the first metal-oxide-semiconductor, is then connected with the first plant-grid connection mouth；The auxiliary source circuit of AC includes second source access port, the second primary side winding, the second capacitor, the second metal-oxide-semiconductor, the second diode；It is connected after second capacitor is in parallel with the second metal-oxide-semiconductor with second source access port；Second metal-oxide-semiconductor, the second primary side winding and the second diode are connected after being sequentially connected in series with second source access port.

Description

A kind of circuit of reversed excitation

Technical field

This application involves circuit field more particularly to a kind of circuit of reversed excitation.

Background technique

Most of circuit of reversed excitation currently on the market has direct current (full name in English: Direct Current, abbreviation: DC) Auxiliary source circuit and alternating current (alternating current, referred to as: AC) auxiliary source circuit.And in order in the premise of power supply efficiency The lower auxiliary source of reduction accounts for plate suqare and complete machine cost, generallys use the side of the auxiliary source circuit of DC Yu the auxiliary source circuit common transformer of AC at present Case designs circuit of reversed excitation.

Now with the primary side winding of the auxiliary source circuit of the DC and the primary side winding of the auxiliary source circuit of the AC are mutual in order to prevent in technology For normal shock winding, as shown in Figure 1, the diode D1 that contacts in the primary side winding of the auxiliary source circuit of DC of the circuit of reversed excitation, together When in the primary side winding of the auxiliary source circuit of AC of the circuit of reversed excitation contact a diode D2.

For this mode in the auxiliary source circuit work of AC, the auxiliary source circuit of DC is since the series system of diode D1 is so as to cause nothing Method forms current loop.In this case, metal-oxide semiconductor (MOS) crystal (the metal oxide of the auxiliary source circuit of the DC Semiconductor, referred to as: the MOS) capacitor of pipe is unable to complete electric discharge, larger so as to cause the switching loss of metal-oxide-semiconductor.

Summary of the invention

The embodiment of the present application provides a kind of circuit of reversed excitation, for reducing the switching loss of the metal-oxide-semiconductor in the auxiliary source DC.

In a first aspect, the embodiment of the present application provides a kind of circuit of reversed excitation, which includes the auxiliary source circuit of direct current DC, is handed over Flow the auxiliary source circuit of AC, the auxiliary source circuit of the DC and the auxiliary source circuit common transformer of the AC；

The auxiliary source circuit of the DC includes the first plant-grid connection mouth, the first primary side winding, first capacitor, the first metal oxide half Conductor crystal metal-oxide-semiconductor, first diode and first object resistance；

It is connected after the first capacitor and first metal-oxide-semiconductor are in parallel with the first plant-grid connection mouth；

First metal-oxide-semiconductor, first primary side winding and the first diode connect after being sequentially connected in series with first power supply Entrance is connected；

Connect after the first object resistance and the first diode are in parallel with first metal-oxide-semiconductor, it is then first electric with this Source access port is connected；

The auxiliary source circuit of the AC includes second source access port, the second primary side winding, the second capacitor, the second metal-oxide-semiconductor, the two or two Pole pipe；

It is connected after second capacitor is in parallel with second metal-oxide-semiconductor with the second source access port；

Second metal-oxide-semiconductor, second primary side winding and second diode connect after being sequentially connected in series with the second source Entrance is connected.

In practical applications, the auxiliary source circuit of the DC further includes the first chip power, first chip power and first electricity Hold parallel connection to be connected with the first plant-grid connection mouth later；The auxiliary source circuit of the AC further includes the second chip power, second chip electricity It is connected after source is in parallel with second capacitor with the second source access port.The auxiliary source circuit of the DC further includes that the first leakage inductance is inhaled simultaneously Module is received, wherein the first leakage inductance absorption module can be in series with general-purpose diode by zener diode.Wherein, the pressure stabilizing The cathode of diode is connected with the cathode of the general-purpose diode, first primary side winding connect with the first diode after with this First leakage inductance absorption module is in parallel.The auxiliary source circuit of the AC further includes the second leakage inductance absorption module, the second leakage inductance absorption module by Zener diode is in series with general-purpose diode.Wherein, the cathode phase of the cathode of the zener diode and the accommodation diode Even, second primary side winding is in parallel with the second leakage inductance absorption module with after second Diode series.

In technical solution provided by the embodiments of the present application, first mesh in parallel in the first diode of the auxiliary source circuit of the DC After marking resistance, when the auxiliary source circuit work of the AC, in the case that the first metal-oxide-semiconductor of the auxiliary source circuit of the DC is disconnected, the first MOS Capacitor in pipe, the first capacitor and the first object resistance form complete current loop, so as to cause first metal-oxide-semiconductor In capacitor can discharge, and then reduce the switching loss of the auxiliary source metal-oxide-semiconductor of DC.

Optionally, which further includes acquisition module and control module, which is connected with the control module； The acquisition module has with the auxiliary source circuit of the DC and the auxiliary source circuit of the AC simultaneously is connected；The control module and the auxiliary source circuit of the DC And the auxiliary source circuit of the AC have it is connected；

The acquisition module, for acquiring the bus voltage value of the circuit of reversed excitation；

The control module, the bus voltage value for being acquired according to the acquisition module control the operation of the circuit of reversed excitation.

It is illustrated below for the control logic in the circuit of reversed excitation:

In a kind of possible implementation, which controls the operation of the circuit of reversed excitation from the auxiliary source circuit side DC, specifically Situation is as follows:

Acquisition module in the circuit of reversed excitation, specifically for acquiring the mother of the auxiliary source circuit of the DC in the anode of third diode Line voltage value, the anode of the third diode connect the first plant-grid connection mouth of the auxiliary source circuit of the DC, the third diode Cathode connects the first capacitor；

The bus voltage value of the control module, the auxiliary source circuit of the DC for being acquired according to the acquisition module controls the flyback The operation of circuit.

In this case, optionally, the control module meets specifically for the bus voltage value when the auxiliary source circuit of the DC When the first preset condition, the auxiliary source circuit of the AC is closed, then opens the auxiliary source circuit of the DC；

When the bus voltage value of the auxiliary source circuit of the DC meets the second preset condition, the auxiliary source circuit of the DC is closed, then The auxiliary source circuit of the AC is opened.

Optionally, which is that the bus voltage value of the auxiliary source circuit of the DC is less than first threshold and is greater than second Threshold value；Second preset condition is less than for the bus voltage value of the auxiliary source circuit of the DC greater than the first threshold or the busbar voltage should Second threshold.

Optionally, which is 600 volts, which is 250 volts.

In practical applications, which can be arranged with second preset condition according to practical application scene, For example first preset condition is that the bus voltage value of the auxiliary source circuit of the DC is less than or equal to first threshold and is greater than or equal to the Two threshold values；Second preset condition is that the bus voltage value of the auxiliary source circuit of the DC is greater than the first threshold or the busbar voltage is less than The second threshold.Or first preset condition is the bus voltage value of the auxiliary source circuit of the DC less than first threshold and is greater than or waits In second threshold；Second preset condition is that the bus voltage value of the auxiliary source circuit of the DC is greater than or equal to the first threshold or the DC The busbar voltage of auxiliary source circuit is less than the second threshold.Or first preset condition is the bus voltage value of the auxiliary source circuit of the DC Less than or equal to first threshold and it is greater than second threshold；Second preset condition is that the bus voltage value of the auxiliary source circuit of the DC is greater than The bus voltage value of the first threshold or the auxiliary source circuit of the DC is less than or equal to the second threshold.Simultaneously the first threshold with should Second threshold can also be configured according to practical application scene, and specific data are herein without limitation.

In practical applications, which can also acquire the input voltage value of the auxiliary source circuit of the DC, then the control Module controls the operation of the circuit of reversed excitation according to the input voltage value of the auxiliary source circuit of the DC.Concrete implementation mode can use The identical mode of the operation of the circuit of reversed excitation is controlled with according to the bus voltage value of the auxiliary source circuit of the DC, it can also be using others Mode, specifically herein without limitation.

In alternatively possible implementation, which controls the operation of the circuit of reversed excitation from the auxiliary source circuit side AC, tool Body situation is as follows:

The acquisition module should specifically for acquiring the bus voltage value of the auxiliary source circuit of the AC in the anode of the 4th diode The anode of 4th diode connects the second source access port of the auxiliary source circuit of the AC, the cathode of the 4th diode connect this Two capacitors；

The bus voltage value of the control module, the auxiliary source circuit of the AC for being acquired according to the acquisition module controls the flyback The operation of circuit.

In this case, the control module is particularly used in when the bus voltage value of the auxiliary source circuit of the AC meets third When preset condition, the auxiliary source circuit of the AC is closed, then opens the auxiliary source circuit of the DC；When the busbar voltage of the auxiliary source circuit of the AC When value meets four preset conditions, the auxiliary source circuit of the DC is closed, the auxiliary source circuit of the AC is opened.

Optionally, which is that the bus voltage value of the auxiliary source circuit of the AC is greater than the third threshold value or the AC is auxiliary The busbar voltage of source circuit is less than the 4th threshold value；4th preset condition is the bus voltage value of the auxiliary source circuit of the AC less than the Three threshold values and be greater than the 4th threshold value.

Optionally, which is 600 volts, and the 4th threshold value is 250 volts.

In practical applications, which can be arranged with the 4th preset condition according to practical application scene, Such as the 4th preset condition be that the bus voltage value of the auxiliary source circuit of the AC is less than or equal to first threshold and is greater than or equal to the Two threshold values；The third preset condition is that the bus voltage value of the auxiliary source circuit of the AC is greater than the first threshold or the busbar voltage is less than The second threshold.Or the 4th preset condition be that the bus voltage value of the auxiliary source circuit of the AC is less than and first threshold and is greater than or waits In second threshold；The third preset condition is that the bus voltage value of the auxiliary source circuit of the AC is greater than or equal to the first threshold or the AC The busbar voltage of auxiliary source circuit is less than the second threshold.Or the 4th preset condition be the auxiliary source circuit of the AC bus voltage value Less than or equal to first threshold and it is greater than second threshold；The third preset condition is that the bus voltage value of the auxiliary source circuit of the AC is greater than The bus voltage value of the first threshold or the auxiliary source circuit of the AC is less than or equal to the second threshold.Simultaneously the first threshold with should Second threshold can also be configured according to practical application scene, and specific data are herein without limitation.

In practical applications, which can also acquire the input voltage value of the auxiliary source circuit of the AC, then the control Module controls the operation of the circuit of reversed excitation according to the input voltage value of the auxiliary source circuit of the AC.Concrete implementation mode can use The identical mode of the operation of the circuit of reversed excitation is controlled with according to the bus voltage value of the auxiliary source circuit of the AC, it can also be using others Mode, specifically herein without limitation.

In technical solution provided by the embodiments of the present application, which can be somebody's turn to do by single side control in several ways The operation of circuit of reversed excitation can effectively improve the working efficiency of circuit of reversed excitation.

Optionally, the control module is also used to control the operation of the circuit of reversed excitation according to preset time period.

Optionally, the control module is specifically used for when the preset time period is 7 points to the same day ten nine of the same day, by this The auxiliary source circuit of AC is closed, and then opens the auxiliary source circuit of the DC；

When the preset time period is ten nine points to next day 7 of the same day, the auxiliary source circuit of the DC is closed, then by the AC Auxiliary source circuit is opened.

Optionally, the control module is also used to determine the operating status of the circuit of reversed excitation according to the generating state of inverter.

Optionally, the control module is specifically used for closing the auxiliary source circuit of the AC when the inverter is powered to power grid, Then the auxiliary source circuit of the DC is opened；

When power grid is to the inverter power supply, the auxiliary source circuit of the DC is closed, then opens the auxiliary source circuit of the AC.

In practical applications, which controls the flyback according to the generating state of preset time period either inverter The scheme of the operation of circuit can be somebody's turn to do with the control module according to the control of the bus voltage value or input voltage value of the circuit of reversed excitation The schemes synthesis of the operation of circuit of reversed excitation considers, wherein the control module is according to the bus voltage value or input of the circuit of reversed excitation The priority that voltage value controls the scheme of the operation of the circuit of reversed excitation is higher.

In technical solution provided by the embodiments of the present application, the operation of the circuit of reversed excitation, Ke Yiyou are controlled according to various ways The working efficiency of the raising circuit of reversed excitation of effect.

Optionally, the auxiliary source circuit of the AC further includes the second target resistance；

Connect after second target resistance and second diodes in parallel with second metal-oxide-semiconductor, it is then second electric with this Source access port is connected.

In technical solution provided by the embodiments of the present application, second mesh in parallel on the second diode in the auxiliary source circuit of the AC After marking resistance, in the case where the auxiliary source circuit work of the DC and the second metal-oxide-semiconductor of the auxiliary source circuit of the AC are disconnected, this second Capacitor in metal-oxide-semiconductor, second capacitor and second target resistance form complete current loop, so as to cause this second Capacitor in metal-oxide-semiconductor can discharge, and then reduce the switching loss of the auxiliary source metal-oxide-semiconductor of AC.

Second aspect, the embodiment of the present application provide a kind of circuit of reversed excitation, comprising:

The auxiliary source circuit of direct current DC exchanges the auxiliary source circuit of AC, the auxiliary source circuit of the DC and the auxiliary source circuit common transformer of the AC；

The auxiliary source circuit of the DC includes the first plant-grid connection mouth, the first primary side winding, first capacitor, the first metal oxide half Conductor crystal metal-oxide-semiconductor, first diode；

The auxiliary source circuit of the AC includes first object resistance, second source access port, the second primary side winding, the second capacitor, Two metal-oxide-semiconductors and the second diode；

Second metal-oxide-semiconductor, second primary side winding and second diode connect after being sequentially connected in series with the second source Entrance is connected；

Connect after the first object resistance and second diodes in parallel with second metal-oxide-semiconductor, it is then second electric with this Source access port is connected.

Optionally, which is 600 volts, which is 250 volts.

Optionally, which is 600 volts, and the 4th threshold value is 250 volts.

Optionally, the auxiliary source circuit of the DC further includes the second target resistance；

Connect after second target resistance and the first diode are in parallel with first metal-oxide-semiconductor, it is then first electric with this Source access port is connected.

In technical solution provided by the embodiments of the present application, second mesh in parallel on the second diode in the auxiliary source circuit of the DC After marking resistance, in the case where the auxiliary source circuit work of the AC and the first metal-oxide-semiconductor of the auxiliary source circuit of the DC are disconnected, this first Capacitor in metal-oxide-semiconductor, the first capacitor and second target resistance form complete current loop, so as to cause this first Capacitor in metal-oxide-semiconductor can discharge, and then reduce the switching loss of the auxiliary source metal-oxide-semiconductor of DC.

As can be seen from the above technical solutions, the embodiment of the present application has the advantage that the first of the auxiliary source circuit of the DC On diode after the parallel connection first object resistance, when the auxiliary source circuit work of the AC, the first metal-oxide-semiconductor of the auxiliary source circuit of the DC is not connect In the case where logical, the capacitor in first metal-oxide-semiconductor, the first capacitor and the first object resistance form complete electric current and return Road can discharge so as to cause the capacitor in first metal-oxide-semiconductor, and then reduce the switching loss of the auxiliary source metal-oxide-semiconductor of DC.

Detailed description of the invention

Fig. 1 is a kind of schematic diagram of circuit of reversed excitation in the prior art；

Fig. 2 is one embodiment schematic diagram of circuit of reversed excitation in the embodiment of the present application；

Fig. 3 (a) is a kind of current trend schematic diagram of circuit of reversed excitation in the embodiment of the present application；

Fig. 3 (b) is another current trend schematic diagram of circuit of reversed excitation in the embodiment of the present application；

Fig. 4 is another embodiment schematic diagram of circuit of reversed excitation in the embodiment of the present application；

Fig. 5 (a) is a kind of current trend schematic diagram of circuit of reversed excitation in the embodiment of the present application；

Fig. 5 (b) is another current trend schematic diagram of circuit of reversed excitation in the embodiment of the present application；

Fig. 6 is another embodiment schematic diagram of circuit of reversed excitation in the embodiment of the present application；

Fig. 7 (a) is a kind of current trend schematic diagram of circuit of reversed excitation in the embodiment of the present application；

Fig. 7 (b) is another current trend schematic diagram of circuit of reversed excitation in the embodiment of the present application.

Specific embodiment

The description and claims of this application and term " first ", " second ", " third ", " in above-mentioned attached drawing The (if present)s such as four " are to be used to distinguish similar objects, without being used to describe a particular order or precedence order.It should manage The data that solution uses in this way are interchangeable under appropriate circumstances, so that the embodiments described herein can be in addition to illustrating herein Or the sequence other than the content of description is implemented.In addition, term " includes " and " having " and their any deformation, it is intended that Cover it is non-exclusive include, for example, containing the process, method, system, product or equipment of a series of steps or units need not limit In step or unit those of is clearly listed, but may include be not clearly listed or for these process, methods, produce The other step or units of product or equipment inherently.

Most of circuit of reversed excitation currently on the market has direct current (full name in English: Direct Current, abbreviation: DC) Auxiliary source circuit and alternating current (alternating current, referred to as: AC) auxiliary source circuit.And in order in the premise of power supply efficiency The lower auxiliary source of reduction accounts for plate suqare and complete machine cost, generallys use the side of the auxiliary source circuit of DC Yu the auxiliary source circuit common transformer of AC at present Case designs circuit of reversed excitation.Now with the primary side of the primary side winding of the auxiliary source circuit of the DC and the auxiliary source circuit of the AC in order to prevent in technology Winding normal shock winding each other a, as shown in Figure 1, diode of contacting in the primary side winding of the auxiliary source circuit of DC of the circuit of reversed excitation D1, while the diode D2 that contacts in the primary side winding of the auxiliary source circuit of the AC of the circuit of reversed excitation.This mode is in the auxiliary source AC When circuit works, the auxiliary source circuit of DC can not form current loop due to the series system of diode D1.Such case Under, the capacitor of the metal-oxide-semiconductor of the auxiliary source circuit of the DC is unable to complete electric discharge, larger so as to cause the switching loss of metal-oxide-semiconductor.

In order to solve this problem, the embodiment of the present application provides a kind of circuit of reversed excitation, comprising: the auxiliary source circuit of direct current DC, Exchange the auxiliary source circuit of AC, the auxiliary source circuit of the DC and the auxiliary source circuit common transformer of the AC；The auxiliary source circuit of the DC includes the first power supply Access port, the first primary side winding, first capacitor, the first metal-oxide semiconductor (MOS) crystal metal-oxide-semiconductor, first diode and the first mesh Mark resistance；It is connected after the first capacitor and first metal-oxide-semiconductor are in parallel with the first plant-grid connection mouth；First metal-oxide-semiconductor, this One primary side winding and the first diode are connected after being sequentially connected in series with the first plant-grid connection mouth；The first object resistance with It connects after the first diode is in parallel with first metal-oxide-semiconductor, is then connected with the first plant-grid connection mouth；The auxiliary source circuit of the AC Including second source access port, the second primary side winding, the second capacitor, the second metal-oxide-semiconductor, the second diode；Second capacitor with should It is connected after second metal-oxide-semiconductor is in parallel with the second source access port；Second metal-oxide-semiconductor, second primary side winding and this second Diode is connected after being sequentially connected in series with the second source access port.

A point situation is illustrated below:

One, resonant current loop is generated in the auxiliary source circuit of the DC.

Concrete condition please refers to shown in Fig. 2, one embodiment of the circuit of reversed excitation in the embodiment of the present application, the circuit of reversed excitation It include: the auxiliary source circuit 201 of DC, the auxiliary source circuit 202 of AC, the auxiliary source circuit of the DC and the auxiliary source circuit common transformer of the AC；

The auxiliary source circuit 201 of the DC include the first plant-grid connection mouth 2011, the first primary side winding 2012, first capacitor 2013, First metal-oxide-semiconductor 2014, first diode 2015 and first object resistance 2016；

The auxiliary source circuit 202 of the AC include second source access port 2021, the second primary side winding 2022, the second capacitor 2023, Second metal-oxide-semiconductor 2024, the second diode 2025；

Wherein, the first capacitor 2013 it is in parallel with first metal-oxide-semiconductor 2014 after with 2011 phase of the first plant-grid connection mouth Even；

First metal-oxide-semiconductor 2014, first primary side winding 2012 and the first diode 2015 be sequentially connected in series after with The first plant-grid connection mouth 2011 is connected；

It connects after the first object resistance 2016 is in parallel with the first diode 2015 with first metal-oxide-semiconductor 2014, so It is connected afterwards with the first plant-grid connection mouth 2011；

It is connected after second capacitor 2023 is in parallel with second metal-oxide-semiconductor 2024 with the second source access port 2021；

Second metal-oxide-semiconductor 2024, second primary side winding 20 and second diode 2025 be sequentially connected in series after with this Second source access port 2021 is connected.

In practical applications, the auxiliary source circuit 201 of the DC further includes the first chip power 2017, first chip power 2017 It is connected after in parallel with the first capacitor 2013 with the first plant-grid connection mouth 2011；The auxiliary source circuit 202 of the AC further includes second Chip power 2026, second chip power 2026 it is in parallel with second capacitor 2023 after with the second source access port 2021 It is connected.The auxiliary source circuit 201 of the DC further includes the first leakage inductance absorption module 2018 simultaneously, wherein the first leakage inductance absorption module 2018 It can be in series with general-purpose diode by zener diode.Wherein, the cathode of the zener diode and the general-purpose diode Cathode be connected, first primary side winding 2012 connect with the first diode 2015 after with the first leakage inductance absorption module 2018 It is in parallel.The auxiliary source circuit 202 of the AC further includes the second leakage inductance absorption module 2027, and the second leakage inductance absorption module 2027 is by pressure stabilizing two Pole pipe is in series with general-purpose diode.Wherein, the cathode of the zener diode is connected with the cathode of common logical diode, this Two primary side windings 2022 are in parallel with the second leakage inductance absorption module 2027 after connecting with second diode 2023.

In actual moving process, when the auxiliary starting of source circuit 202 of the AC brings into operation, and the auxiliary source circuit 201 of DC is closed, Shown in its current trend such as Fig. 3 (a), the electric current since the anode of the second source access port 2021, then by this second Capacitor 2023 returns to the cathode of the second source access port 2021；The electric current is opened from the anode of the second source access port 2021 Begin, then pass sequentially through second primary side winding 2022, second diode 2025 and second metal-oxide-semiconductor 2024 return to this The cathode of two plant-grid connection mouths 2021.The auxiliary source circuit 201 of the AC passes through second primary side winding 2022 and first primary side winding 2012 generate induced voltage.Since second primary side winding 2022 and first primary side winding 2012 are Same Name of Ends, this The positive and negative anodes of the induced voltage of the generation of one primary side winding 2012 (such as Fig. 3 identical as the positive and negative anodes of second primary side winding 2022 (a) shown in, the upper end of first primary side winding 2012 is anode, and lower end is cathode).Then the electricity in the auxiliary source current 201 of the DC It flows away to shown in such as Fig. 3 (a), then which passes sequentially through first electricity since the anode of first primary side winding 2012 Hold the 2013, capacitor of first metal-oxide-semiconductor 2014 and the first object resistance 2016 returns to the negative of first primary side winding 2012 Pole.When the auxiliary starting of source circuit 401 of the DC brings into operation, and the auxiliary source circuit 402 of AC is closed, current trend such as Fig. 3 (b) institute Show, then which returns to first electricity by the first capacitor 4013 since the anode of the first plant-grid connection mouth 4011 The cathode of source access port 4011；The electric current since the anode of the first plant-grid connection mouth 4011, then pass sequentially through this first Primary side winding 4012, the first diode 4015 and first metal-oxide-semiconductor 4014 return to the negative of the first plant-grid connection mouth 4011 Pole.The auxiliary source circuit 401 of the DC generates induced voltage by first primary side winding 4012 and second primary side winding 4022.Due to First primary side winding 4022 and second primary side winding 4012 are Same Name of Ends, therefore the generation of second primary side winding 4022 The positive and negative anodes of induced voltage are identical as the positive and negative anodes of first primary side winding, and (such as Fig. 3 (b) is shown, second primary side winding 4022 Upper end be anode, lower end is cathode).Then the electric current in the auxiliary source current 402 of the AC can not form complete loops.

Optionally, as shown in Fig. 2, the circuit of reversed excitation further includes acquisition module 203 and control module 204.

The acquisition module 203 is connected with the control module 204；Simultaneously the acquisition module 203 and the auxiliary source circuit 201 of the DC with And the auxiliary source circuit 202 of the AC have it is connected；The control module 204 and the auxiliary source circuit 201 of the DC and the auxiliary source circuit 202 of the AC are all Have connected；

The acquisition module 203, for acquiring the bus voltage value of the circuit of reversed excitation；

The control module 204, the bus voltage value for being acquired according to the acquisition module 203 control the circuit of reversed excitation Operation.

In the present embodiment, there are following several schemes for the control logic of the circuit of reversed excitation:

In a kind of possible implementation, which acquires the bus voltage value of the auxiliary source circuit 201 of the DC, at this moment The auxiliary source circuit 201 of the DC further includes third diode 2019；The anode of the third diode 2019 connects the auxiliary source circuit 201 of the DC The first plant-grid connection mouth 2011, the cathode of the third diode 2019 connects the first capacitor 2013.

At this moment the acquisition module 203 acquires the bus voltage value of the auxiliary source circuit of the DC in the anode of the third diode；So The bus voltage value of the auxiliary source circuit of the DC is sent to the control module 204 by the acquisition module 203 afterwards；The finally control module 204 control the operation of the circuit of reversed excitation according to the bus voltage value of the auxiliary source circuit 201 of the DC.

Optionally, which controls the fortune of the circuit of reversed excitation according to the bus voltage value of the auxiliary source circuit 201 of the DC Row can use following scheme:

When the bus voltage value of the auxiliary source circuit of the DC meets the first preset condition, the control module 204 is by the auxiliary source the AC Circuit 202 is closed, and then opens the auxiliary source circuit 201 of the DC；

When the bus voltage value of the auxiliary source circuit of the DC meets the second preset condition, the control module 204 is by the auxiliary source the DC Circuit 201 is closed, and then opens the auxiliary source circuit 202 of the AC.

On this basis, optionally, which is the bus voltage value of the auxiliary source circuit 201 of the DC less than first Threshold value and be greater than second threshold；Second preset condition is that the bus voltage value of the auxiliary source circuit 201 of the DC is greater than the first threshold Or the busbar voltage is less than the second threshold.The first threshold is 600 volts, which is 250 volts.

In practical applications, which can be arranged with second preset condition according to practical application scene, For example first preset condition is the bus voltage value of the auxiliary source circuit 201 of the DC less than or equal to first threshold and is greater than or equal to Second threshold；Second preset condition is that the bus voltage value of the auxiliary source circuit 201 of the DC is greater than the first threshold or bus electricity Pressure is less than the second threshold.Or first preset condition is the bus voltage value of the auxiliary source circuit 201 of the DC less than first threshold And it is greater than or equal to second threshold；Second preset condition is greater than or equal to for the bus voltage value of the auxiliary source circuit 201 of the DC should The busbar voltage of first threshold or the auxiliary source circuit 201 of the DC is less than the second threshold.Or first preset condition is that the DC is auxiliary The bus voltage value of source circuit 201 is less than or equal to first threshold and is greater than second threshold；Second preset condition is that the DC is auxiliary The bus voltage value of source circuit 201 is greater than the first threshold or the bus voltage value of the auxiliary source circuit 201 of the DC is less than or equal to The second threshold.The first threshold can also be configured with the second threshold according to practical application scene simultaneously, specific data Herein without limitation.

In practical applications, there are input voltages before the first plant-grid connection mouth 2011 for the auxiliary source circuit 201 of the DC, should Input voltage carries out inputting the first plant-grid connection mouth 2011 after voltage processing.Therefore the acquisition module 203 can also acquire The input voltage value of the auxiliary source circuit 201 of the DC, then the control module 204 is according to the input voltage value of the auxiliary source circuit 201 of the DC Control the operation of the circuit of reversed excitation.Concrete implementation mode can use and the bus voltage value control according to the auxiliary source circuit of the DC The identical mode of operation of the circuit of reversed excitation is made, it can also be using other modes, specifically herein without limitation.

In alternatively possible implementation, which acquires the bus voltage value of the auxiliary source circuit 202 of the AC, this When the auxiliary source circuit 202 of the AC further include the 4th diode 2028；The anode of 4th diode 2028 connects the auxiliary source circuit of the AC The 202 second source access port 2021, the cathode of the 4th diode 2028 connect second capacitor 2023.

At this moment the acquisition module 203 acquires the bus voltage value of the auxiliary source circuit of the AC in the anode of the 4th diode；So The bus voltage value of the auxiliary source circuit of the AC is sent to the control module 204 by the acquisition module 203 afterwards；The finally control module 204 control the operation of the circuit of reversed excitation according to the bus voltage value of the auxiliary source circuit 202 of the AC.

Optionally, which controls the fortune of the circuit of reversed excitation according to the bus voltage value of the auxiliary source circuit 202 of the AC Row can use following scheme:

Optionally, which is that the bus voltage value of the auxiliary source circuit 202 of the AC is greater than the third threshold value or is somebody's turn to do The busbar voltage of the auxiliary source circuit 202 of AC is less than the 4th threshold value；4th preset condition is the bus electricity of the auxiliary source circuit 202 of the AC Pressure value is less than third threshold value and is greater than the 4th threshold value.The third threshold value is 600 volts, and the 4th threshold value is 250 volts.

In practical applications, which can be arranged with the 4th preset condition according to practical application scene, Such as the 4th preset condition be that the bus voltage value of the auxiliary source circuit 202 of the AC is less than or equal to and first threshold and is greater than or equal to Second threshold；The third preset condition is that the bus voltage value of the auxiliary source circuit 202 of the AC is greater than the first threshold or bus electricity Pressure is less than the second threshold.Or the 4th preset condition be the auxiliary source circuit 202 of the AC bus voltage value be less than first threshold And it is greater than or equal to second threshold；The third preset condition is greater than or equal to for the bus voltage value of the auxiliary source circuit 202 of the AC should The busbar voltage of first threshold or the auxiliary source circuit 202 of the AC is less than the second threshold.Or the 4th preset condition be the AC it is auxiliary The bus voltage value of source circuit 202 is less than or equal to first threshold and is greater than second threshold；The third preset condition is that the AC is auxiliary The bus voltage value of source circuit 202 is greater than the first threshold or the bus voltage value of the auxiliary source circuit 202 of the AC is less than or equal to The second threshold.The first threshold can also be configured with the second threshold according to practical application scene simultaneously, specific data Herein without limitation.

In practical applications, there are input voltages before the second source access port 2021 for the auxiliary source circuit 202 of the AC, should Input voltage carries out inputting the second source access port 2021 after voltage processing.Therefore the acquisition module 203 can also acquire The input voltage value of the auxiliary source circuit 202 of the AC, then the control module 204 is according to the input voltage value of the auxiliary source circuit 202 of the AC Control the operation of the circuit of reversed excitation.Concrete implementation mode can use and the bus voltage value control according to the auxiliary source circuit of the AC The identical mode of operation of the circuit of reversed excitation is made, it can also be using other modes, specifically herein without limitation.

Optionally, the control module 204 is also used to control the operation of the circuit of reversed excitation according to preset time period.

Optionally, the control module 204 is specifically used for when the preset time period is 7 points to the same day ten nine of the same day, The auxiliary source circuit 202 of the AC is closed, then opens the auxiliary source circuit 201 of the DC；

When the preset time period is ten nine points to next day 7 of the same day, the auxiliary source circuit 201 of the DC is closed, then should The auxiliary source circuit 202 of AC is opened.

Optionally, the control module 204 is also used to determine the operation shape of the circuit of reversed excitation according to the generating state of inverter State.

Optionally, the control module 204 is specifically used for when the inverter is powered to power grid, by the auxiliary source circuit 202 of the AC It closes, then opens the auxiliary source circuit 201 of the DC；

When power grid is to the inverter power supply, the auxiliary source circuit 201 of the DC is closed, then opens the auxiliary source circuit 202 of the AC It opens.

In the present embodiment, in the first diode of the auxiliary source circuit of the DC after the parallel connection first object resistance, as the AC The work of auxiliary source circuit, in the case that the first metal-oxide-semiconductor of the auxiliary source circuit of the DC is disconnected, capacitor in first metal-oxide-semiconductor, this first Capacitor and the first object resistance form complete current loop, can discharge so as to cause the capacitor in first metal-oxide-semiconductor, And then reduce the switching loss of the auxiliary source metal-oxide-semiconductor of DC.

Two, resonant current loop is generated in the auxiliary source circuit of the AC.

Concrete condition please refers to shown in Fig. 4, one embodiment of the circuit of reversed excitation in the embodiment of the present application, the circuit of reversed excitation It include: the auxiliary source circuit 401 of DC, the auxiliary source circuit 402 of AC, the auxiliary source circuit of the DC and the auxiliary source circuit common transformer of the AC；

The auxiliary source circuit 401 of the DC include the first plant-grid connection mouth 4011, the first primary side winding 4012, first capacitor 4013, First metal-oxide-semiconductor 4014, first diode 4015；

The auxiliary source circuit 402 of the AC include second source access port 4021, the second primary side winding 4022, the second capacitor 4023, Second metal-oxide-semiconductor 4024, the second diode 4025 and the second target resistance 4026；

Wherein, the first capacitor 4013 it is in parallel with first metal-oxide-semiconductor 4014 after with 4011 phase of the first plant-grid connection mouth Even；

First metal-oxide-semiconductor 4014, first primary side winding 4012 and the first diode 4015 be sequentially connected in series after with The first plant-grid connection mouth 4011 is connected；

It is connected after second capacitor 4023 is in parallel with second metal-oxide-semiconductor 4024 with the second source access port 4021；

Second metal-oxide-semiconductor 4024, second primary side winding 40 and second diode 4025 be sequentially connected in series after with this Second source access port 4021 is connected；

It connects after second target resistance 4026 is in parallel with second diode 4025 with second metal-oxide-semiconductor 4024, so It is connected afterwards with the second source access port 4021.

In practical applications, the auxiliary source circuit 401 of the DC further includes the first chip power 4016, first chip power 4016 It is connected after in parallel with the first capacitor 4013 with the first plant-grid connection mouth 4011；The auxiliary source circuit 402 of the AC further includes second Chip power 4027, second chip power 4027 it is in parallel with second capacitor 4023 after with the second source access port 4021 It is connected.The auxiliary source circuit 401 of the DC further includes the first leakage inductance absorption module 4017 simultaneously, wherein the first leakage inductance absorption module 4017 It can be in series with general-purpose diode by zener diode.Wherein, the cathode of the zener diode and the general-purpose diode Cathode be connected, first primary side winding 4012 connect with the first diode 4015 after with the first leakage inductance absorption module 4017 It is in parallel.The auxiliary source circuit 402 of the AC further includes the second leakage inductance absorption module 4028, and the second leakage inductance absorption module 4028 is by pressure stabilizing two Pole pipe is in series with general-purpose diode.Wherein, the cathode of the zener diode is connected with the cathode of common logical diode, this Two primary side windings 4022 are in parallel with the second leakage inductance absorption module 4028 after connecting with second diode 4023.

In actual moving process, when the auxiliary starting of source circuit 402 of the AC brings into operation, and the auxiliary source circuit 401 of DC is closed, Shown in its current trend such as Fig. 5 (a), the electric current since the anode of the second source access port 4021, then by this second Capacitor 4023 returns to the cathode of the second source access port 4021；The electric current is opened from the anode of the second source access port 4021 Begin, then pass sequentially through second primary side winding 4022, second diode 4025 and second metal-oxide-semiconductor 4024 return to this The cathode of two plant-grid connection mouths 4021.The auxiliary source circuit 401 of the AC passes through second primary side winding 4022 and first primary side winding 4012 generate induced voltage.Since second primary side winding 4022 and first primary side winding 4012 are Same Name of Ends, this The positive and negative anodes of the induced voltage of the generation of one primary side winding 4012 are identical as the positive and negative anodes of first primary side winding (such as Fig. 5 (a) institute Show, the upper end of first primary side winding 4012 is anode, and lower end is cathode).Then the electric current in the auxiliary source current 401 of the DC can not Form complete loops.When the auxiliary starting of source circuit 401 of the DC brings into operation, and the auxiliary source circuit 402 of AC is closed, current trend is such as Shown in Fig. 5 (b), then which is returned to since the anode of the first plant-grid connection mouth 4011 by the first capacitor 4013 The cathode of the first plant-grid connection mouth 4011；Then the electric current successively leads to since the anode of the first plant-grid connection mouth 4011 It crosses first primary side winding 4012, the first diode 4015 and first metal-oxide-semiconductor 4014 and returns to the first plant-grid connection mouth 4011 cathode.The auxiliary source circuit 402 of the DC generates induction by first primary side winding 4012 and second primary side winding 4022 Voltage.Since first primary side winding 4012 and second primary side winding 4022 are Same Name of Ends, second primary side winding The positive and negative anodes of the induced voltage of 4022 generation are identical as the positive and negative anodes of first primary side winding 4012 (shown in such as Fig. 5 (b), to be somebody's turn to do The upper end of second primary side winding 4022 is anode, and lower end is cathode).Then current trend such as Fig. 5 in the auxiliary source current 402 of the AC (b) shown in, the electric current since the anode of second primary side winding 4022, then pass sequentially through second capacitor 4023, this The capacitor of two metal-oxide-semiconductors 4024 and second target resistance 4026 return to the cathode of second primary side winding 4022.

Optionally, as shown in figure 4, the circuit of reversed excitation further includes acquisition module 403 and control module 404.

The acquisition module 403 is connected with the control module 404；Simultaneously the acquisition module 403 and the auxiliary source circuit 401 of the DC with And the auxiliary source circuit 402 of the AC have it is connected；The control module 404 and the auxiliary source circuit 401 of the DC and the auxiliary source circuit 402 of the AC are all Have connected；

The acquisition module 403, for acquiring the bus voltage value of the circuit of reversed excitation；

The control module 404, the bus voltage value for being acquired according to the acquisition module 403 control the circuit of reversed excitation Operation.

In a kind of possible implementation, which acquires the bus voltage value of the auxiliary source circuit 401 of the DC, at this moment The auxiliary source circuit 401 of the DC further includes third diode 4018；The anode of the third diode 4018 connects the auxiliary source circuit 401 of the DC The first plant-grid connection mouth 4011, the cathode of the third diode 4018 connects the first capacitor 4013.

At this moment the acquisition module 403 acquires the busbar voltage of the auxiliary source circuit of the DC in the anode of the third diode 4018 Value；Then the bus voltage value of the auxiliary source circuit 401 of the DC is sent to the control module 404 by the acquisition module 403；The finally control Molding block 404 controls the operation of the circuit of reversed excitation according to the bus voltage value of the auxiliary source circuit 401 of the DC.

Optionally, which controls the fortune of the circuit of reversed excitation according to the bus voltage value of the auxiliary source circuit 401 of the DC Row can use following scheme:

When the bus voltage value of the auxiliary source circuit of the DC meets the first preset condition, the control module 404 is by the auxiliary source the AC Circuit 402 is closed, and then opens the auxiliary source circuit 401 of the DC；

When the bus voltage value of the auxiliary source circuit of the DC meets the second preset condition, the control module 404 is by the auxiliary source the DC Circuit 401 is closed, and then opens the auxiliary source circuit 402 of the AC.

On this basis, optionally, which is the bus voltage value of the auxiliary source circuit 401 of the DC less than first Threshold value and be greater than second threshold；Second preset condition is that the bus voltage value of the auxiliary source circuit 401 of the DC is greater than the first threshold Or the busbar voltage is less than the second threshold.The first threshold is 600 volts, which is 250 volts.

In practical applications, which can be arranged with second preset condition according to practical application scene, For example first preset condition is the bus voltage value of the auxiliary source circuit 401 of the DC less than or equal to first threshold and is greater than or equal to Second threshold；Second preset condition is that the bus voltage value of the auxiliary source circuit 401 of the DC is greater than the first threshold or bus electricity Pressure is less than the second threshold.Or first preset condition is the bus voltage value of the auxiliary source circuit 401 of the DC less than first threshold And it is greater than or equal to second threshold；Second preset condition is greater than or equal to for the bus voltage value of the auxiliary source circuit 401 of the DC should The busbar voltage of first threshold or the auxiliary source circuit 401 of the DC is less than the second threshold.Or first preset condition is that the DC is auxiliary The bus voltage value of source circuit 401 is less than or equal to first threshold and is greater than second threshold；Second preset condition is that the DC is auxiliary The bus voltage value of source circuit 401 is greater than the first threshold or the bus voltage value of the auxiliary source circuit 401 of the DC is less than or equal to The second threshold.The first threshold can also be configured with the second threshold according to practical application scene simultaneously, specific data Herein without limitation.

In practical applications, there are input voltages before the first plant-grid connection mouth 4011 for the auxiliary source circuit 401 of the DC, should Input voltage carries out inputting the first plant-grid connection mouth 4011 after voltage processing.Therefore the acquisition module 403 can also acquire The input voltage value of the auxiliary source circuit 401 of the DC, then the control module 404 is according to the input voltage value of the auxiliary source circuit 401 of the DC Control the operation of the circuit of reversed excitation.Concrete implementation mode can use and the bus voltage value control according to the auxiliary source circuit of the DC The identical mode of operation of the circuit of reversed excitation is made, it can also be using other modes, specifically herein without limitation.

In alternatively possible implementation, which acquires the bus voltage value of the auxiliary source circuit 402 of the AC, this When the auxiliary source circuit 402 of the AC further include the 4th diode 4029；The anode of 4th diode 4029 connects the auxiliary source circuit of the AC The 402 second source access port 4021, the cathode of the 4th diode 4029 connect second capacitor 4023.

At this moment the acquisition module 403 acquires the bus electricity of the auxiliary source circuit 402 of the AC in the anode of the 4th diode 4029 Pressure value；Then the bus voltage value of the auxiliary source circuit of the AC is sent to the control module 404 by the acquisition module 403；The finally control Molding block 404 controls the operation of the circuit of reversed excitation according to the bus voltage value of the auxiliary source circuit 402 of the AC.

Optionally, which controls the fortune of the circuit of reversed excitation according to the bus voltage value of the auxiliary source circuit 402 of the AC Row can use following scheme:

Optionally, which is that the bus voltage value of the auxiliary source circuit 402 of the AC is greater than the third threshold value or is somebody's turn to do The busbar voltage of the auxiliary source circuit 402 of AC is less than the 4th threshold value；4th preset condition is the bus electricity of the auxiliary source circuit 402 of the AC Pressure value is less than third threshold value and is greater than the 4th threshold value.The third threshold value is 600 volts, and the 4th threshold value is 250 volts.

In practical applications, which can be arranged with the 4th preset condition according to practical application scene, Such as the 4th preset condition be that the bus voltage value of the auxiliary source circuit 402 of the AC is less than or equal to and first threshold and is greater than or equal to Second threshold；The third preset condition is that the bus voltage value of the auxiliary source circuit 402 of the AC is greater than the first threshold or bus electricity Pressure is less than the second threshold.Or the 4th preset condition be the auxiliary source circuit 402 of the AC bus voltage value be less than first threshold And it is greater than or equal to second threshold；The third preset condition is greater than or equal to for the bus voltage value of the auxiliary source circuit 402 of the AC should The busbar voltage of first threshold or the auxiliary source circuit 402 of the AC is less than the second threshold.Or the 4th preset condition be the AC it is auxiliary The bus voltage value of source circuit 402 is less than or equal to first threshold and is greater than second threshold；The third preset condition is that the AC is auxiliary The bus voltage value of source circuit 402 is greater than the first threshold or the bus voltage value of the auxiliary source circuit 402 of the AC is less than or equal to The second threshold.The first threshold can also be configured with the second threshold according to practical application scene simultaneously, specific data Herein without limitation.

In practical applications, there are input voltages before the second source access port 4021 for the auxiliary source circuit 402 of the AC, should Input voltage carries out inputting the second source access port 4021 after voltage processing.Therefore the acquisition module 403 can also acquire The input voltage value of the auxiliary source circuit 402 of the AC, then the control module 404 is according to the input voltage value of the auxiliary source circuit 402 of the AC Control the operation of the circuit of reversed excitation.Concrete implementation mode can use and the bus voltage value control according to the auxiliary source circuit of the AC The identical mode of operation of the circuit of reversed excitation is made, it can also be using other modes, specifically herein without limitation.

Optionally, the control module 404 is also used to control the operation of the circuit of reversed excitation according to preset time period.

Optionally, the control module 404 is specifically used for when the preset time period is 7 points to the same day ten nine of the same day, The auxiliary source circuit 402 of the AC is closed, then opens the auxiliary source circuit 401 of the DC；

When the preset time period is ten nine points to next day 7 of the same day, the auxiliary source circuit 401 of the DC is closed, then should The auxiliary source circuit 402 of AC is opened.

Optionally, the control module 404 is also used to determine the operation shape of the circuit of reversed excitation according to the generating state of inverter State.

Optionally, the control module 404 is specifically used for when the inverter is powered to power grid, by the auxiliary source circuit 402 of the AC It closes, then opens the auxiliary source circuit 401 of the DC；

When power grid is to the inverter power supply, the auxiliary source circuit 401 of the DC is closed, then opens the auxiliary source circuit 402 of the AC It opens.

In the present embodiment, on the second diode in the auxiliary source circuit of the AC after in parallel second target resistance, in the DC Auxiliary source circuit work, and in the case that the second metal-oxide-semiconductor of the auxiliary source circuit of the AC is disconnected, the capacitor in second metal-oxide-semiconductor, this Two capacitors and second target resistance form complete current loop, can put so as to cause the capacitor in second metal-oxide-semiconductor Electricity, and then reduce the switching loss of the auxiliary source metal-oxide-semiconductor of AC.

Three, resonant current loop is all constituted in the auxiliary source circuit of the DC and the auxiliary source circuit of the AC.

Concrete condition please refers to shown in Fig. 6, one embodiment of the circuit of reversed excitation in the embodiment of the present application, the circuit of reversed excitation It include: the auxiliary source circuit 601 of DC, the auxiliary source circuit 602 of AC, the auxiliary source circuit of the DC and the auxiliary source circuit common transformer of the AC；

The auxiliary source circuit 601 of the DC include the first plant-grid connection mouth 6011, the first primary side winding 6012, first capacitor 6013, First metal-oxide-semiconductor 6014, first diode 6015 and first object resistance 6016；

The auxiliary source circuit 602 of the AC include second source access port 6021, the second primary side winding 6022, the second capacitor 6023, Second metal-oxide-semiconductor 6024, the second diode 6025 and the second target resistance 6026；

Wherein, the first capacitor 6013 it is in parallel with first metal-oxide-semiconductor 6014 after with 6011 phase of the first plant-grid connection mouth Even；

First metal-oxide-semiconductor 6014, first primary side winding 6012 and the first diode 6015 be sequentially connected in series after with The first plant-grid connection mouth 6011 is connected；

It connects after the first object resistance 6016 is in parallel with the first diode 6015 with first metal-oxide-semiconductor 6014, so It is connected afterwards with the first plant-grid connection mouth 6011；

It is connected after second capacitor 6023 is in parallel with second metal-oxide-semiconductor 6024 with the second source access port 6021；

Second metal-oxide-semiconductor 6024, second primary side winding 60 and second diode 6025 be sequentially connected in series after with this Second source access port 6021 is connected；

It connects after second target resistance 6026 is in parallel with second diode 6025 with second metal-oxide-semiconductor 6024, so It is connected afterwards with the second source access port 6021.

In practical applications, the auxiliary source circuit 601 of the DC further includes the first chip power 6017, first chip power 6017 It is connected after in parallel with the first capacitor 6013 with the first plant-grid connection mouth 6011；The auxiliary source circuit 602 of the AC further includes second Chip power 6027, second chip power 6027 it is in parallel with second capacitor 6023 after with the second source access port 6021 It is connected.The auxiliary source circuit 601 of the DC further includes the first leakage inductance absorption module 6018 simultaneously, wherein the first leakage inductance absorption module 6018 It can be in series with general-purpose diode by zener diode.Wherein, the cathode of the zener diode and the general-purpose diode Cathode be connected, first primary side winding 6012 connect with the first diode 6015 after with the first leakage inductance absorption module 6018 It is in parallel.The auxiliary source circuit 602 of the AC further includes the second leakage inductance absorption module 6028, and the second leakage inductance absorption module 6028 is by pressure stabilizing two Pole pipe is in series with general-purpose diode.Wherein, the cathode of the zener diode is connected with the cathode of common logical diode, this Two primary side windings 6022 are in parallel with the second leakage inductance absorption module 6028 after connecting with second diode 6023.

In actual moving process, when the auxiliary starting of source circuit 602 of the AC brings into operation, and the auxiliary source circuit 601 of DC is closed, Shown in its current trend such as Fig. 7 (a), the electric current since the anode of the second source access port 6021, then by this second Capacitor 6023 returns to the cathode of the second source access port 6021；The electric current is opened from the anode of the second source access port 6021 Begin, then pass sequentially through second primary side winding 6022, second diode 6025 and second metal-oxide-semiconductor 6024 return to this The cathode of two plant-grid connection mouths 6021.The auxiliary source circuit 601 of the AC passes through second primary side winding 6022 and first primary side winding 6012 generate induced voltage.Since second primary side winding 6022 and first primary side winding 6012 are Same Name of Ends, this The positive and negative anodes of the induced voltage of the generation of one primary side winding 6012 (such as Fig. 7 identical as the positive and negative anodes of second primary side winding 6022 (a) shown in, the upper end of first primary side winding 6012 is anode, and lower end is cathode).Then the electricity in the auxiliary source current 601 of the DC It flows away to shown in such as Fig. 7 (a), then which passes sequentially through first electricity since the anode of first primary side winding 6012 Hold the 6013, capacitor of first metal-oxide-semiconductor 6014 and the first object resistance 6016 returns to the negative of first primary side winding 6012 Pole.When the auxiliary starting of source circuit 601 of the DC brings into operation, and the auxiliary source circuit 602 of AC is closed, current trend such as Fig. 7 (b) institute Show, then which returns to first electricity by the first capacitor 6013 since the anode of the first plant-grid connection mouth 6011 The cathode of source access port 6011；The electric current since the anode of the first plant-grid connection mouth 6011, then pass sequentially through this first Primary side winding 6012, the first diode 6015 and first metal-oxide-semiconductor 6014 return to the negative of the first plant-grid connection mouth 6011 Pole.The auxiliary source circuit 602 of the DC generates induced voltage by first primary side winding 6012 and second primary side winding 6022.Due to First primary side winding 6012 and second primary side winding 6022 are Same Name of Ends, therefore the generation of second primary side winding 6022 The positive and negative anodes of induced voltage are identical as the positive and negative anodes of first primary side winding 6012, and (such as Fig. 7 (b) is shown, second primary side winding 6022 upper end is anode, and lower end is cathode).Then shown in current trend such as Fig. 7 (b) in the auxiliary source current 602 of the AC, the electricity Then stream passes sequentially through second capacitor 6023, second metal-oxide-semiconductor 6024 since the anode of second primary side winding 6022 Capacitor and second target resistance 6026 return to the cathode of second primary side winding 6022.

Optionally, as shown in fig. 6, the circuit of reversed excitation further includes acquisition module 603 and control module 604.

The acquisition module 603 is connected with the control module 604；Simultaneously the acquisition module 603 and the auxiliary source circuit 601 of the DC with And the auxiliary source circuit 602 of the AC have it is connected；The control module 604 and the auxiliary source circuit 601 of the DC and the auxiliary source circuit 602 of the AC are all Have connected；

The acquisition module 603, for acquiring the bus voltage value of the circuit of reversed excitation；

The control module 604, the bus voltage value for being acquired according to the acquisition module 603 control the circuit of reversed excitation Operation.

In a kind of possible implementation, which acquires the bus voltage value of the auxiliary source circuit 601 of the DC, at this moment The auxiliary source circuit 601 of the DC further includes third diode 6019；The anode of the third diode 6019 connects the auxiliary source circuit 601 of the DC The first plant-grid connection mouth 6011, the cathode of the third diode 6019 connects the first capacitor 6013.

At this moment the acquisition module 603 acquires the busbar voltage of the auxiliary source circuit of the DC in the anode of the third diode 6019 Value；Then the bus voltage value of the auxiliary source circuit of the DC is sent to the control module 604 by the acquisition module 603；The finally control Module 604 controls the operation of the circuit of reversed excitation according to the bus voltage value of the auxiliary source circuit 601 of the DC.

Optionally, which controls the fortune of the circuit of reversed excitation according to the bus voltage value of the auxiliary source circuit 601 of the DC Row can use following scheme:

When the bus voltage value of the auxiliary source circuit of the DC meets the first preset condition, the control module 604 is by the auxiliary source the AC Circuit 602 is closed, and then opens the auxiliary source circuit 601 of the DC；

When the bus voltage value of the auxiliary source circuit of the DC meets the second preset condition, the control module 604 is by the auxiliary source the DC Circuit 601 is closed, and then opens the auxiliary source circuit 602 of the AC.

On this basis, optionally, which is the bus voltage value of the auxiliary source circuit 601 of the DC less than first Threshold value and be greater than second threshold；Second preset condition is that the bus voltage value of the auxiliary source circuit 601 of the DC is greater than the first threshold Or the busbar voltage is less than the second threshold.The first threshold is 600 volts, which is 250 volts.

In practical applications, which can be arranged with second preset condition according to practical application scene, For example first preset condition is the bus voltage value of the auxiliary source circuit 601 of the DC less than or equal to first threshold and is greater than or equal to Second threshold；Second preset condition is that the bus voltage value of the auxiliary source circuit 601 of the DC is greater than the first threshold or bus electricity Pressure is less than the second threshold.Or first preset condition is the bus voltage value of the auxiliary source circuit 601 of the DC less than first threshold And it is greater than or equal to second threshold；Second preset condition is greater than or equal to for the bus voltage value of the auxiliary source circuit 601 of the DC should The busbar voltage of first threshold or the auxiliary source circuit 601 of the DC is less than the second threshold.Or first preset condition is that the DC is auxiliary The bus voltage value of source circuit 601 is less than or equal to first threshold and is greater than second threshold；Second preset condition is that the DC is auxiliary The bus voltage value of source circuit 601 is greater than the first threshold or the bus voltage value of the auxiliary source circuit 601 of the DC is less than or equal to The second threshold.The first threshold can also be configured with the second threshold according to practical application scene simultaneously, specific data Herein without limitation.

In practical applications, the auxiliary source circuit 601 of the DC before the first plant-grid connection mouth 6011 there are an input voltage, The input voltage carries out inputting the first plant-grid connection mouth 6011 after voltage processing.Therefore the acquisition module 603 can also be adopted Collect the input voltage value of the auxiliary source circuit 601 of the DC, then the control module 604 is according to the input voltage of the auxiliary source circuit 601 of the DC Value controls the operation of the circuit of reversed excitation.Concrete implementation mode can use and the bus voltage value according to the auxiliary source circuit of the DC The identical mode of operation of the circuit of reversed excitation is controlled, it can also be using other modes, specifically herein without limitation.

In alternatively possible implementation, which acquires the bus voltage value of the auxiliary source circuit 602 of the AC, this When the auxiliary source circuit 602 of the AC further include the 4th diode 6029；The anode of 4th diode 6029 connects the auxiliary source circuit of the AC The 602 second source access port 6021, the cathode of the 4th diode 6029 connect second capacitor 6023.

At this moment the acquisition module 603 acquires the busbar voltage of the auxiliary source circuit of the AC in the anode of the 4th diode 6029 Value；Then the bus voltage value of the auxiliary source circuit of the AC is sent to the control module 604 by the acquisition module 603；The finally control Module 604 controls the operation of the circuit of reversed excitation according to the bus voltage value of the auxiliary source circuit 602 of the AC.

Optionally, which controls the fortune of the circuit of reversed excitation according to the bus voltage value of the auxiliary source circuit 602 of the AC Row can use following scheme:

Optionally, which is that the bus voltage value of the auxiliary source circuit 602 of the AC is greater than the third threshold value or is somebody's turn to do The busbar voltage of the auxiliary source circuit 602 of AC is less than the 4th threshold value；4th preset condition is the bus electricity of the auxiliary source circuit 602 of the AC Pressure value is less than third threshold value and is greater than the 4th threshold value.The third threshold value is 600 volts, and the 4th threshold value is 250 volts.

In practical applications, which can be arranged with the 4th preset condition according to practical application scene, Such as the 4th preset condition be that the bus voltage value of the auxiliary source circuit 602 of the AC is less than or equal to and first threshold and is greater than or equal to Second threshold；The third preset condition is that the bus voltage value of the auxiliary source circuit 602 of the AC is greater than the first threshold or bus electricity Pressure is less than the second threshold.Or the 4th preset condition be the auxiliary source circuit 602 of the AC bus voltage value be less than first threshold And it is greater than or equal to second threshold；The third preset condition is greater than or equal to for the bus voltage value of the auxiliary source circuit 602 of the AC should The busbar voltage of first threshold or the auxiliary source circuit 602 of the AC is less than the second threshold.Or the 4th preset condition be the AC it is auxiliary The bus voltage value of source circuit 602 is less than or equal to first threshold and is greater than second threshold；The third preset condition is that the AC is auxiliary The bus voltage value of source circuit 602 is greater than the first threshold or the bus voltage value of the auxiliary source circuit 602 of the AC is less than or equal to The second threshold.The first threshold can also be configured with the second threshold according to practical application scene simultaneously, specific data Herein without limitation.

In practical applications, there are input voltages before the second source access port 6021 for the auxiliary source circuit 602 of the AC, should Input voltage carries out inputting the second source access port 6021 after voltage processing.Therefore the acquisition module 603 can also acquire The input voltage value of the auxiliary source circuit 602 of the AC, then the control module 604 is according to the input voltage value of the auxiliary source circuit 602 of the AC Control the operation of the circuit of reversed excitation.Concrete implementation mode can use and the bus voltage value control according to the auxiliary source circuit of the AC The identical mode of operation of the circuit of reversed excitation is made, it can also be using other modes, specifically herein without limitation.

Optionally, the control module 604 is also used to control the operation of the circuit of reversed excitation according to preset time period.

Optionally, the control module 604 is specifically used for when the preset time period is 7 points to the same day ten nine of the same day, The auxiliary source circuit 602 of the AC is closed, then opens the auxiliary source circuit 601 of the DC；

When the preset time period is ten nine points to next day 7 of the same day, the auxiliary source circuit 601 of the DC is closed, then should The auxiliary source circuit 602 of AC is opened.

Optionally, the control module 604 is also used to determine the operation shape of the circuit of reversed excitation according to the generating state of inverter State.

Optionally, the control module 604 is specifically used for when the inverter is powered to power grid, by the auxiliary source circuit 602 of the AC It closes, then opens the auxiliary source circuit 601 of the DC；

When power grid is to the inverter power supply, the auxiliary source circuit 601 of the DC is closed, then opens the auxiliary source circuit 602 of the AC It opens.

In the present embodiment, in the first diode of the auxiliary source circuit of the DC after the parallel connection first object resistance, as the AC The work of auxiliary source circuit, in the case that the first metal-oxide-semiconductor of the auxiliary source circuit of the DC is disconnected, capacitor in first metal-oxide-semiconductor, this first Capacitor and the first object resistance form complete current loop, can discharge so as to cause the capacitor in first metal-oxide-semiconductor, And then reduce the switching loss of the auxiliary source metal-oxide-semiconductor of DC.Second target electricity in parallel on the second diode in the auxiliary source circuit of the AC After resistance, in the case where the auxiliary source circuit work of the DC and the second metal-oxide-semiconductor of the auxiliary source circuit of the AC are disconnected, second metal-oxide-semiconductor In capacitor, second capacitor and second target resistance form complete current loop, so as to cause in second metal-oxide-semiconductor Capacitor can discharge, and then reduce the switching loss of the auxiliary source metal-oxide-semiconductor of AC.

It is apparent to those skilled in the art that for convenience and simplicity of description, the system of foregoing description, The specific work process of device and unit, can refer to corresponding processes in the foregoing method embodiment, and details are not described herein.

In several embodiments provided herein, it should be understood that disclosed system, device and method can be with It realizes by another way.For example, the apparatus embodiments described above are merely exemplary, for example, the unit It divides, only a kind of logical function partition, there may be another division manner in actual implementation, such as multiple units or components It can be combined or can be integrated into another system, or some features can be ignored or not executed.Another point, it is shown or The mutual coupling, direct-coupling or communication connection discussed can be through some interfaces, the indirect coupling of device or unit It closes or communicates to connect, can be electrical property, mechanical or other forms.

The unit as illustrated by the separation member may or may not be physically separated, aobvious as unit The component shown may or may not be physical unit, it can and it is in one place, or may be distributed over multiple In network unit.It can select some or all of unit therein according to the actual needs to realize the mesh of this embodiment scheme 's.

It, can also be in addition, each functional unit in each embodiment of the application can integrate in one processing unit It is that each unit physically exists alone, can also be integrated in one unit with two or more units.Above-mentioned integrated list Member both can take the form of hardware realization, can also realize in the form of software functional units.

If the integrated unit is realized in the form of SFU software functional unit and sells or use as independent product When, it can store in a computer readable storage medium.Based on this understanding, the technical solution of the application is substantially The all or part of the part that contributes to existing technology or the technical solution can be in the form of software products in other words It embodies, which is stored in a storage medium, including some instructions are used so that a computer Equipment (can be personal computer, server or the network equipment etc.) executes the complete of each embodiment the method for the application Portion or part steps.And storage medium above-mentioned includes: USB flash disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), magnetic or disk etc. are various can store journey The medium of sequence code.

The above, above embodiments are only to illustrate the technical solution of the application, rather than its limitations；Although referring to before Embodiment is stated the application is described in detail, those skilled in the art should understand that: it still can be to preceding Technical solution documented by each embodiment is stated to modify or equivalent replacement of some of the technical features；And these It modifies or replaces, the spirit and scope of each embodiment technical solution of the application that it does not separate the essence of the corresponding technical solution.

Claims

1. a kind of circuit of reversed excitation characterized by comprising

The auxiliary source circuit of direct current DC exchanges the auxiliary source circuit of AC, the auxiliary source circuit of DC and the auxiliary source circuit common transformer of the AC；

The auxiliary source circuit of DC is partly led including the first plant-grid connection mouth, the first primary side winding, first capacitor, the first metal oxide Body crystal metal-oxide-semiconductor, first diode and first object resistance；

The first plant-grid connection mouth includes first anode interface and the first cathode interface；

The first capacitor and the first object resistance, first metal-oxide-semiconductor, first primary side winding and the described 1st Pole pipe is in parallel, wherein the first object resistance it is in parallel with the first diode later with first metal-oxide-semiconductor and described the One primary side winding is sequentially connected in series, and the drain electrode of first metal-oxide-semiconductor is connected with the cathode of the first diode, first primary side The Same Name of Ends of winding is connected with the anode of the first diode, the source electrode of first metal-oxide-semiconductor and the first cathode interface It is connected, first primary side winding is connected with the first anode interface, and the two poles of the earth of the first capacitor are respectively with described first Anode interface is connected with the first cathode interface；

The auxiliary source circuit of AC includes second source access port, the second primary side winding, the second capacitor, the second metal-oxide-semiconductor, the two or two pole Pipe and the second target resistance；

The second source access port includes second plate interface and the second cathode interface；

Second capacitor and second target resistance, second metal-oxide-semiconductor, second primary side winding and the described 2nd 2 Pole pipe is in parallel, wherein after second target resistance and second diodes in parallel with second metal-oxide-semiconductor and described the Two primary side windings are sequentially connected in series, and the drain electrode of second metal-oxide-semiconductor is connected with the cathode of second diode, second primary side The Same Name of Ends of winding is connected with the anode of second diode, the source electrode of second metal-oxide-semiconductor and the second cathode interface It is connected, second primary side winding is connected with the second plate interface, and the two poles of the earth of second capacitor are respectively with described second Anode interface is connected with the second cathode interface.

2. circuit of reversed excitation according to claim 1, which is characterized in that the circuit of reversed excitation further includes acquisition module and control Module；

The acquisition module is connected with the control module；

The acquisition module is connected with the auxiliary source circuit of the DC and the auxiliary source circuit of the AC；

The control module is connected with the auxiliary source circuit of the DC and the auxiliary source circuit of the AC；

The control module, the bus voltage value for being acquired according to the acquisition module control the fortune of the circuit of reversed excitation Row.

3. circuit of reversed excitation according to claim 2, which is characterized in that the acquisition module is specifically used in the three or two pole The anode of pipe acquires the bus voltage value of the auxiliary source circuit of the DC, and the anode of the third diode connects the auxiliary source circuit of DC The first anode interface, the cathode of the third diode connects the first capacitor；

The control module, the auxiliary source circuit of the DC for being acquired according to the acquisition module bus voltage value control described in The operation of circuit of reversed excitation.

4. circuit of reversed excitation according to claim 3, which is characterized in that the control module is specifically used for when the DC is auxiliary When the bus voltage value of source circuit meets the first preset condition, the auxiliary source circuit of the AC is closed, then by the auxiliary source electricity of the DC It opens on road；

5. circuit of reversed excitation according to claim 4, which is characterized in that first preset condition is the auxiliary source circuit of the DC Bus voltage value be less than first threshold and be greater than second threshold；

Second preset condition is that the bus voltage value of the auxiliary source circuit of the DC is greater than the first threshold or the auxiliary source the DC The busbar voltage of circuit is less than the second threshold.

6. circuit of reversed excitation according to claim 5, which is characterized in that the first threshold is 600 volts, the second threshold It is 250 volts.

7. circuit of reversed excitation according to claim 2, which is characterized in that the acquisition module is specifically used in the four or two pole The anode of pipe acquires the bus voltage value of the auxiliary source circuit of the AC, and the anode of the 4th diode connects the auxiliary source circuit of AC The second plate interface, the cathode of the 4th diode connects second capacitor；

The control module, the auxiliary source circuit of the AC for being acquired according to the acquisition module bus voltage value control described in The operation of circuit of reversed excitation.

8. circuit of reversed excitation according to claim 7, which is characterized in that the control module is specifically used for when the AC is auxiliary When the bus voltage value of source circuit meets third preset condition, the auxiliary source circuit of the AC is closed, then by the auxiliary source electricity of the DC It opens on road；

When the bus voltage value of the auxiliary source circuit of the AC meets four preset conditions, the auxiliary source circuit of the DC is closed, by institute The auxiliary source circuit of AC is stated to open.

9. circuit of reversed excitation according to claim 8, which is characterized in that the third preset condition is the auxiliary source circuit of the AC Bus voltage value be greater than the busbar voltage of third threshold value or the auxiliary source circuit of the AC less than the 4th threshold value；

4th preset condition is that the bus voltage value of the auxiliary source circuit of the AC is less than the third threshold value and is greater than described the Four threshold values.

10. circuit of reversed excitation according to claim 9, which is characterized in that the third threshold value is 600 volts, the 4th threshold Value is 250 volts.

11. the circuit of reversed excitation according to any one of claim 2 to 10, which is characterized in that the control module is also used to The operation of the circuit of reversed excitation is controlled according to preset time period.

12. circuit of reversed excitation according to claim 11, which is characterized in that the control module is specifically used for when described pre- If the period is 7 points to the same day ten nine of the same day, the auxiliary source circuit of the AC is closed, then opens the auxiliary source circuit of the DC It opens；

When the preset time period is ten nine points to next day 7 of the same day, the auxiliary source circuit of the DC is closed, it then will be described The auxiliary source circuit of AC is opened.

13. the circuit of reversed excitation according to any one of claim 2 to 10, which is characterized in that the control module is also used to The operating status of the circuit of reversed excitation is determined according to the generating state of inverter.

14. circuit of reversed excitation according to claim 13, which is characterized in that the control module is specifically used for when described inverse Become device to when power grid power supply, the auxiliary source circuit of the AC is closed, then opens the auxiliary source circuit of the DC；