CN109599843A - A kind of current foldback circuit and inverter of light-coupled isolation - Google Patents
A kind of current foldback circuit and inverter of light-coupled isolation Download PDFInfo
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- CN109599843A CN109599843A CN201910018088.2A CN201910018088A CN109599843A CN 109599843 A CN109599843 A CN 109599843A CN 201910018088 A CN201910018088 A CN 201910018088A CN 109599843 A CN109599843 A CN 109599843A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
- H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
- H02H7/122—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for inverters, i.e. dc/ac converters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
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Abstract
The current foldback circuit and inverter of a kind of light-coupled isolation of power electronics field are provided in the embodiment of the present invention；The current foldback circuit of the light-coupled isolation on the bus of inverter by being arranged current sampling circuit; the conducting of transistor switching circuit is controlled by current sampling circuit to control the conducting of optical coupling isolation circuit; to realize the isolation of detection signal and driving signal; while guaranteeing the overcurrent protection of inverter and IGBT, the anti-interference ability of inverter is improved.
Description
Technical field
The present invention relates to power electronics field, in particular to the current foldback circuit of a kind of light-coupled isolation and inversion
Device.
Background technique
In the Design and manufacturing process of inverter, short circuit overcurrent protects circuit extremely important, is largely fixed
The safety issue of inverter in actual use.If short circuit overcurrent protect circuit malfunction, band RCD load or it is inverse
When becoming device output short-circuit, inversion pipe is likely to burn, and therefore, short circuit overcurrent protects circuit very big to the effect of inverter.
In the prior art, the short circuit overcurrent protection of IGBT can be divided into Uge monitoring method or Uce monitoring method, the two principle base
This is similar, is all when being increased using collector current Ic, Uge or Uce also can raised principle, when Uge or Uce is more than Uge
(sat) or when Uce (sat) driving circuit of IGBT, is automatically shut down, since Uge is basically unchanged in the event of a failure, and Uce
It changes greatly, and Uge variation is also smaller when moving back saturation and occurring, it is difficult to grasp, thus generally be monitored in practice using Uce
Technology protects IGBT.
In realizing process of the present invention, inventor's discovery is above, and at least there are the following problems in the related technology: above-mentioned inverse
Although the mode for becoming the protection of Uce monitoring technology used in device field IGBT can be realized the short circuit overcurrent protection of IGBT, still
Peripheral circuit is complicated, higher cost, and the isolation of detection signal difficult to realize, poor anti jamming capability have certain use
Limitation.
Summary of the invention
In view of the above drawbacks of the prior art, the object of the present invention is to provide one kind be capable of the optocoupler of isolation detection signal every
From current foldback circuit and inverter.
The purpose of the present invention is what is be achieved through the following technical solutions:
In order to solve the above technical problems, in a first aspect, the overcurrent for providing a kind of light-coupled isolation in the embodiment of the present invention is protected
Protection circuit, comprising: current sampling circuit, transistor switching circuit, optical coupling isolation circuit and and gate control circuit；
The current sampling circuit is connected in parallel on the DC bus cathode up-sampling bus current of inverter, and the triode is opened
The control terminal on powered-down road is connected in parallel to the current sampling circuit, and the control terminal of the optical coupling isolation circuit is connected to the triode
The input terminal of switching circuit, the input terminal of the optical coupling isolation circuit are connected to the control terminal with gate control circuit；
When bus current is excessive, the electric current for flowing through the current sampling circuit is larger, drives the transistor switching circuit
It is open-minded, so that controlling described and gate control circuit after driving the optical coupling isolation circuit to be connected turns off the inverter.
Optionally, further includes: DSP controls chip, and the DSP control chip is connected to the control with gate control circuit
End drives IGBT drive circuit module with gate control circuit by the way that pwm control signal control is described；
When the optical coupling isolation circuit is connected, the control terminal with gate control circuit is turned off, thus described in hardware shutdown
Pwm control signal, the DSP control chip turn off the inverter.
Optionally, further includes: RC absorbing circuit, the input terminal of the RC absorbing circuit are connected in parallel to the current sample electricity
Road, output end are connected to the control terminal of the transistor switching circuit.
Optionally, the RC absorbing circuit includes the first current-limiting resistance, the second current-limiting resistance, the first filter capacitor and second
Filter capacitor, the input terminal of first current-limiting resistance are connected in parallel to the current sampling circuit, first current-limiting resistance it is defeated
Outlet is connected to the anode of the second current-limiting resistance input terminal and first filter capacitor, second current-limiting resistance it is defeated
Outlet is connected to the anode of second filter capacitor and the control terminal of the transistor switching circuit, first filter capacitor
With the minus earth of second filter capacitor.
Optionally, the current sampling circuit includes current sampling resistor.
Optionally, the transistor switching circuit includes NPN triode, pull down resistor, threshold resistance and current-limiting resistance；
The base stage and emitter of the NPN triode are connected in parallel to the current sampling circuit and the pull down resistor, described
The collector of NPN triode is connected to the output end of the threshold resistance, the threshold resistance both ends be connected in parallel to the optocoupler every
Control terminal from circuit, the both ends of the current-limiting resistance are respectively connected to the driving current and the threshold resistance of the inverter
Input terminal, the output end ground connection of the emitter of the NPN triode and the pull down resistor.
Optionally, the optical coupling isolation circuit includes optocoupler and pull-up resistor, and the optocoupler includes light emitting diode and light
Quick triode；
The light emitting diode is connected in parallel to the input terminal of the transistor switching circuit, the collector of the phototriode
It is connected to the output end of the pull-up resistor, the input terminal of the pull-up resistor is connected to reference power supply, the phototriode
The emitter of collector is grounded；
The input terminal conducting of transistor switching circuit transistor switching circuit when being connected, thus described luminous two
Pole pipe is dragged down described in the level control of the phototriode collector and is gated after the driving phototriode conducting is connected
Circuit processed closes the inverter.
Optionally, it is described with gate control circuit include with door a, with door b, with door c and with door d；
It is described to be respectively connected to the DSP control with door a, described and door b, described and door c and described and door d pin 1
Chip, it is described to be respectively connected to the light-coupled isolation electricity with door a, described and door b, described and door c and described and door d pin 2
The input terminal on road, it is described to be respectively connected to the I GBT with door a, described and door b, described and door c and described and door d pin 3
Drive circuit module；
When the optical coupling isolation circuit is connected, the input terminal level of the optical coupling isolation circuit is dragged down, thus described and door
Control circuit closes hardware and closes the DSP control chip and control the IGBT drive circuit module shutdown.
Optionally, the IGBT drive circuit module input is connected to the pin 3 with gate control circuit, output end
It is connected to turning on and off for the inverter control inverter.
In order to solve the above technical problems, second aspect, a kind of inverter, the inverter are provided in the embodiment of the present invention
Including electrolytic capacitor, inverter bridge and, the current foldback circuit of the described in any item light-coupled isolations of the claims 1-9；
The both ends of current sampling circuit in the current foldback circuit of the light-coupled isolation are connected to the electrolytic capacitor
The emitter of the preceding bridge arm down tube of cathode and the inverter bridge samples DC bus cathodal current.
Compared with prior art, the beneficial effects of the present invention are: being in contrast to the prior art, in the embodiment of the present invention
Provide the current foldback circuit and inverter of a kind of light-coupled isolation；The current foldback circuit of the light-coupled isolation passes through in inversion
Current sampling circuit is set on the bus of device, the conducting of transistor switching circuit is controlled to control light by current sampling circuit
The conducting of coupling isolation circuit is protected to realize the isolation of detection signal and driving signal in the overcurrent for guaranteeing inverter and IGBT
While shield, the anti-interference ability of inverter is improved.
Detailed description of the invention
It is illustrated in one or more embodiments by the picture in corresponding attached drawing, these are exemplary
Illustrate not constitute the restriction to embodiment, the element/module and step in attached drawing with same reference numbers label are expressed as
Similar element/module and step, unless there are special statement, composition does not limit the figure in attached drawing.
Fig. 1 is a kind of schematic block circuit diagram of the inverter provided in the embodiment of the present invention；
Fig. 2 is a kind of electrical block diagram of the inverter provided in the embodiment of the present invention.
Specific embodiment
The present invention is described in detail combined with specific embodiments below.Following embodiment will be helpful to the technology of this field
Personnel further understand the present invention, but the invention is not limited in any way.It should be pointed out that the ordinary skill of this field
For personnel, without departing from the inventive concept of the premise, various modifications and improvements can be made.These belong to the present invention
Protection scope.
It is with reference to the accompanying drawings and embodiments, right in order to which the objects, technical solutions and advantages of the application are more clearly understood
The application is further elaborated.It should be appreciated that specific embodiment described herein is only to explain the application, not
For limiting the application.
Specifically, with reference to the accompanying drawing, the embodiment of the present application is further elaborated.
Embodiment one
Referring to Figure 1 and Fig. 2, a kind of current foldback circuit 1 of light-coupled isolation is provided in the embodiment of the present invention, including
Current sampling circuit 10, transistor switching circuit 20, optical coupling isolation circuit 30, with gate control circuit 40, RC absorbing circuit 50,
DSP controls chip 60 and IGBT drive circuit module 70, and the current foldback circuit 1 of the light-coupled isolation can be in inverter 2
Negative electrode bus up-samples electric current, a sampled signal is got when electric current increases suddenly or generates spike, by controlling three poles
To control the conducting of optical coupling isolation circuit 30, control DSP control chip 60 and IGBT drive electricity for the conducting of pipe switching circuit 20
Road module 70 closes inverter, to realize the isolation of detection signal and driving signal.
The current sampling circuit 10 is connected in parallel on the DC bus cathode up-sampling bus current of inverter 2, three pole
The control terminal of pipe switching circuit 20 is connected in parallel to the current sampling circuit 10, and the control terminal of the optical coupling isolation circuit 30 is connected to
The input terminal of the transistor switching circuit 20, the input terminal of the optical coupling isolation circuit 30 are connected to described and gate control circuit
40 control terminal.When bus current is excessive, the electric current for flowing through the current sampling circuit 10 is larger, drives the triode switch
Circuit 20 is open-minded, so that controlling described and gate control circuit 40 after driving the optical coupling isolation circuit 30 to be connected turns off the inversion
Device.
The input terminal of the RC absorbing circuit 50 is connected in parallel to the current sampling circuit 10, and output end is connected to three pole
The control terminal of pipe switching circuit 20.The DSP control chip 60 is connected to the control terminal with gate control circuit 40, passes through
Pwm control signal control is described to drive IGBT drive circuit module 70 with gate control circuit 40.The optical coupling isolation circuit 30 is led
When logical, the control terminal with gate control circuit 40 is turned off, so that hardware turns off the pwm control signal, the DSP controls core
Piece 60 turns off the inverter 2.
Above-mentioned current sampling circuit 10 includes current sampling resistor R1.
Above-mentioned transistor switching circuit 20 includes NPN triode Q5, pull down resistor R4, threshold resistance R6 and current-limiting resistance
R5.The base stage and emitter of the NPN triode Q5 is connected in parallel to the current sampling circuit 10 and the pull down resistor R4, described
The collector of NPN triode Q5 is connected to the output end of the threshold resistance R6, and the both ends the threshold resistance R6 are connected in parallel to described
The control terminal of optical coupling isolation circuit 10, the both ends of the current-limiting resistance R5 are respectively connected to the driving current VF of the inverter 2
With the input terminal of the threshold resistance R6, the output end of the emitter of the NPN triode Q5 and the pull down resistor R4 are grounded.
Above-mentioned optical coupling isolation circuit 30 include optocoupler U1 and pull-up resistor R7, the optocoupler U1 include light emitting diode (not
Mark) and phototriode (not indicating).The light emitting diode (not indicating) is connected in parallel to the transistor switching circuit 20
Input terminal, the collector of the phototriode (not indicating) are connected to the output end of the pull-up resistor R7, the pull-up electricity
The input terminal of resistance R7 is connected to reference power supply V0, and the phototriode (does not indicate) the emitter ground connection of collector.Described three
The input terminal conducting of the transistor switching circuit 20 when being connected of pole pipe switching circuit 20, so that the light emitting diode (is not marked
Show) electricity that the collector of the phototriode (not indicating) is dragged down after driving phototriode (the not indicating) conducting is connected
Flat control is described to close the inverter 2 with gate control circuit 40.The output end of the optical coupling isolation circuit 30 is grounded.
It is described above with gate control circuit 40 include with door a, with door b, with door c and with door d.Described and door a, described and door
B, it is described with door c and it is described be respectively connected to the DSP control chip with door d pin 1 and receive pwm control signal, it is described with
Door a, the input that the optical coupling isolation circuit 30 is respectively connected to door b, described and door c and described and door d pin 2
End, it is described to be respectively connected to the IGBT drive circuit with door a, described and door b, described and door c and described and door d pin 3
Module 70.The optical coupling isolation circuit 30 be connected when, the input terminal level of the optical coupling isolation circuit 30 drags down, thus it is described with
Gate control circuit 40 closes hardware and closes the DSP control chip 60 and control the shutdown of IGBT drive circuit module 70.
Above-mentioned RC absorbing circuit 50 includes the first current-limiting resistance R2, the second current-limiting resistance R3, the first filter capacitor C3 and the
Two filter capacitor C4, the input terminal of the first current-limiting resistance R2 are connected in parallel to the current sampling circuit 10, first current limliting
The output end of resistance R2 is connected to the anode of the second current-limiting resistance R3 input terminal and the first filter capacitor C3, and described
The output end of two current-limiting resistance R3 is connected to the control of the anode and the transistor switching circuit 20 of the second filter capacitor C4
End processed, the minus earth of the first filter capacitor C3 and the second filter capacitor C4.
The control terminal of above-mentioned DSP control chip 60 is connected to described and gate control circuit 40.The optical coupling isolation circuit 30
When conducting, the input terminal level of the optical coupling isolation circuit 30 is dragged down, so that described close hardware closing with gate control circuit 40
The DSP controls chip 60, i.e., does not receive the pwm control signal that chip 60 is controlled from DSP, and the DSP control chip 60 exists
Pwm control signal can not be sent to when being turned off by hardware with gate control circuit 40, DSP control 60 software control of chip is closed
Disconnected inverter 2.
The input terminal of above-mentioned IGBT drive circuit module 70 is connected to the pin 3 with gate control circuit 40, output end
It is connected to the inverter 2 and controls turning on and off for inverter 2.
Wherein, in the present embodiment, the DC bus cathode of the inverter 2 is the both ends of current sampling resistor R1.Institute
The input terminal of current sampling circuit 10 is stated, i.e., the input terminal of the described current sampling resistor R1 is connected to the switching tube Q2 of inverter 2
With the emitter of switching tube Q4.The output end of the current sampling circuit 10, i.e., the output end point of the described current sampling resistor R1
It is not connected to the cathode and ground terminal GND of electrolytic capacitor 21.
The control terminal of the transistor switching circuit 20 is the base stage of NPN triode Q5, is connected to the pull down resistor R4
Input terminal.The input terminal of the transistor switching circuit 20 is the collector of NPN triode Q5, is respectively connected to the threshold value
The pin 2 of the output end of resistance R6 and the light emitting diode (not indicating).The output end of the transistor switching circuit 20 is
The emitter of NPN triode Q5 is respectively connected to the output and ground GND of the pull down resistor R4.
The control terminal of the optical coupling isolation circuit 30 is the both ends of threshold resistance R6, the i.e. pipe of light emitting diode (not indicating)
Foot 1 and pin 2；Wherein, the pin 1 of light emitting diode (not indicating) is connected to the output end and threshold resistance R6 of current-limiting resistance R5
Input terminal；The pin 2 of optical diode (not indicating) is connected to the output end of threshold resistance R6 and the current collection of NPN triode Q5
Pole.The input terminal of the optical coupling isolation circuit 30 is the collector of phototriode (not indicating), i.e. phototriode (is not marked
Show) pin 4, be respectively connected to the pull-up resistor R7 output end and DSP control chip 60 the end INVOCP.The optocoupler
The output end of isolation circuit 30 is the emitter of phototriode (not indicating), the i.e. pin 4 of phototriode (not indicating), is connected
It is connected to ground terminal GND2.
Described and gate control circuit 40 control terminal is described and door a and door b and door c and the pin 1 with door d, difference
Pin PWM1H, pin PWM1L, pin PWM2H and the pin PWM2L for being connected to the DSP control chip receive corresponding PWM
Control signal.Described and gate control circuit 40 input terminal is described and door a and door b and door c and the pin 2 with door d, connection
To the pin 4 of the phototriode (not indicating), the pin 4 of the phototriode (not indicating) after the optocoupler U1 conducting
Level drags down, and controls to make the control terminal with gate control circuit 40 that can not receive from the PWM of DSP control chip
Signal, to realize that hardware is closed.The output end with gate control circuit 40 be it is described with door a, with door b, with door c and with door
The pin 3 of d is respectively connected to the pin PWM1H_V, pin PWM1L_V, pin PWM2H_ of the IGBT drive circuit module 70
V and pin PWM2L_V, so that controlling 70 hardware of IGBT drive circuit module closes inverter 2.
The input terminal of the RC absorbing circuit 50 is the input terminal of the first current-limiting resistance R2, is respectively connected to current sample electricity
Hinder the emitter of the input terminal of R1 and the switching tube Q2 and switching tube Q4 of inverter 2.The output end of the RC absorbing circuit 50 is
The cathode of first filter capacitor C3 and the second filter capacitor C4.It is respectively connected to output end, the electrolysis electricity of current sampling resistor R1
Hold 21 cathode and ground terminal GND.
The control terminal of the DSP control chip 60 is respectively pin INVOCP, pin PWM1H, pin PWM1L, pin
PWM2H and pin PWM2L.The pin INVOCP is respectively connected to the pin of pull-up resistor R7 and phototriode (not indicating)
4.The pin PWM1H, pin PWM1L, pin PWM2H and pin PWM2L are respectively connected to described and door a and door b and door c
With the pin 1 with door d, for output phase answer the pwm control signal control described with gate control circuit 40 and door a, with door b, with
Door c and rule is opened and is closed with door d.
The input terminal of the IGBT drive circuit module 70 be pin PWM1H_V, pin PWM1L_V, pin PWM2H_V and
Pin PWM2L_V, be respectively connected to it is described with door a, with door b, receive with door c and with the pin 3 of door d and open and/or be closed
Control signal.The output end of the IGBT drive circuit module 70 is pin PWM1H_D, pin PWM1L_D, pin PWM2H_D
With pin PWM2L_D, it is connected to the on-off that inverter 2 controls inverter bridge 22.
In the present embodiment, the reference power supply V0 is+5V, and the inversion pipe driving power VF is+21V.The electric current
Sampling resistor R1 is the lesser resistance of a resistance value, is typically chosen that precision is big compared with impact resistance, temperature drift is very low, it is small to be affected by temperature
Resistance.
In some embodiments of others of practical application, the current sampling circuit 10, transistor switching circuit 20, light
Coupling isolation circuit 30 controls in chip 60 and IGBT drive circuit module 70 with gate control circuit 40, RC absorbing circuit 50, DSP
Each element and the concrete model selection and position setting of chip etc. etc. can be configured as needed, do not need to stick to this
Apply for the restriction of embodiment.The connection type of each element in the current foldback circuit 1 of the light-coupled isolation, the medium of connection can
To be configured as needed, the restriction for sticking to the embodiment of the present application is not needed.
Embodiment two
Referring to Figure 1 and Fig. 2, a kind of inverter 2 is provided in the embodiment of the present invention, the inverter 2 includes electrolysis
Capacitor 21 (EC3), inverter bridge 22 and, the current foldback circuit 1 of light-coupled isolation described in above-described embodiment one.The optocoupler
The both ends of current sampling circuit 10 in the current foldback circuit 1 of isolation be connected to the electrolytic capacitor 21 (EC3) cathode and
The emitter of the preceding bridge arm down tube Q2 of the inverter bridge 22 samples DC bus cathodal current.
Wherein, the DC bus cathode is the cathode and preceding bridge arm down tube Q2 (switching tube of the electrolytic capacitor 21 (EC3)
Q2 the conducting wire between).The output end of IGBT drive circuit module 70 in the current foldback circuit 1 of the light-coupled isolation, that is, manage
Foot PWM1H_D, pin PWM1L_D, pin PWM2H_D and pin PWM2L_D are further connected to four of the inverter bridge 22
The base stage of switching tube (switching tube Q1, switching tube Q2, switching tube Q3 and switching tube Q4), for controlling four of the inverter bridge 22
The on-off rule of switching tube.
In the present embodiment, the electrolytic capacitor 21 (EC3) is large bulk capacitance, and the capacitance of unit volume is very
Greatly, it is used for filter rectification.The switching tube Q1, switching tube Q2, switching tube Q3 and switching tube Q4 are metal-oxide-semiconductor.
Each member in some embodiments of others of practical application, in the current foldback circuit 1 of the light-coupled isolation
The setting of part in other embodiments refers to the restriction in the other embodiments of above-described embodiment one, and and will not be described here in detail.It is described
The selection of the concrete model of electrolytic capacitor 21 (EC3) and inverter bridge 22 and position setting etc. can be configured as needed, not needed
Stick to the restriction of the embodiment of the present application.The connection type of each element in the inverter 2, the medium of connection can be according to need
It is configured, does not need the restriction for sticking to the embodiment of the present application.
The current foldback circuit and inverter of a kind of light-coupled isolation are provided in the embodiment of the present invention；The light-coupled isolation
Current foldback circuit controls triode by current sampling circuit and opens by the way that current sampling circuit is arranged on the bus of inverter
The conducting on powered-down road, to realize the isolation of detection signal and driving signal, is being protected to control the conducting of optical coupling isolation circuit
While the overcurrent protection of card inverter and IGBT, the anti-interference ability of inverter is improved.
Finally, it should be noted that the above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；At this
Under the thinking of invention, it can also be combined between the technical characteristic in above embodiments or different embodiments, and exist as above
Many other variations of the different aspect of the invention, for simplicity, they are not provided in details；Although referring to before
Stating embodiment, invention is explained in detail, those skilled in the art should understand that: it still can be to preceding
It states documented technical solution in each embodiment to modify, or wherein regional development and technology feature is equivalently replaced；And this
It modifies or replaces, the range of technical solution in various embodiments of the present invention that it does not separate the essence of the corresponding technical solution.
Claims (10)
1. a kind of current foldback circuit of light-coupled isolation characterized by comprising current sampling circuit, transistor switching circuit,
Optical coupling isolation circuit and and gate control circuit；
The current sampling circuit is connected in parallel on the DC bus cathode up-sampling bus current of inverter, the triode switch electricity
The control terminal on road is connected in parallel to the current sampling circuit, and the control terminal of the optical coupling isolation circuit is connected to the triode switch
The input terminal of circuit, the input terminal of the optical coupling isolation circuit are connected to the control terminal with gate control circuit；
When bus current is excessive, the electric current for flowing through the current sampling circuit is larger, drives the transistor switching circuit open-minded,
To control the described and gate control circuit shutdown inverter after driving the optical coupling isolation circuit to be connected.
2. the current foldback circuit of light-coupled isolation according to claim 1, which is characterized in that
Further include: DSP controls chip, and the DSP control chip is connected to the control terminal with gate control circuit, passes through PWM
It controls and drives IGBT drive circuit module with gate control circuit described in signal control；
When the optical coupling isolation circuit is connected, the control terminal with gate control circuit is turned off, so that hardware turns off the PWM control
Signal processed, the DSP control chip turn off the inverter.
3. the current foldback circuit of light-coupled isolation according to claim 1 or 2, which is characterized in that further include: RC absorbs electricity
Road, the input terminal of the RC absorbing circuit are connected in parallel to the current sampling circuit, and output end is connected to the triode switch electricity
The control terminal on road.
4. the current foldback circuit of light-coupled isolation according to claim 3, which is characterized in that
The RC absorbing circuit includes the first current-limiting resistance, the second current-limiting resistance, the first filter capacitor and the second filter capacitor, institute
The input terminal for stating the first current-limiting resistance is connected in parallel to the current sampling circuit, and the output end of first current-limiting resistance is connected to institute
The anode of the second current-limiting resistance input terminal and first filter capacitor is stated, the output end of second current-limiting resistance is connected to institute
State the anode of the second filter capacitor and the control terminal of the transistor switching circuit, first filter capacitor and second filter
The minus earth of wave capacitor.
5. the current foldback circuit of light-coupled isolation according to claim 1-4, which is characterized in that the electric current is adopted
Sample circuit includes current sampling resistor.
6. the current foldback circuit of light-coupled isolation according to claim 1-5, which is characterized in that the triode
Switching circuit includes NPN triode, pull down resistor, threshold resistance and current-limiting resistance；
The base stage and emitter of the NPN triode are connected in parallel to the current sampling circuit and the pull down resistor, the NPN tri-
The collector of pole pipe is connected to the output end of the threshold resistance, and the threshold resistance both ends are connected in parallel to the optical coupling isolation circuit
Control terminal, the both ends of the current-limiting resistance are respectively connected to the input of the driving current and the threshold resistance of the inverter
The output end ground connection of end, the emitter of the NPN triode and the pull down resistor.
7. the current foldback circuit of light-coupled isolation according to claim 1-6, which is characterized in that the optocoupler every
It include optocoupler and pull-up resistor from circuit, the optocoupler includes light emitting diode and phototriode；
The light emitting diode is connected in parallel to the input terminal of the transistor switching circuit, the collector connection of the phototriode
To the output end of the pull-up resistor, the input terminal of the pull-up resistor is connected to reference power supply, the phototriode current collection
The emitter of pole is grounded；
The input terminal conducting of transistor switching circuit transistor switching circuit when being connected, thus the light emitting diode
Conducting drags down phototriode collector level control after driving the phototriode to be connected is described electric with door control
The inverter is closed on road.
8. according to the current foldback circuit of the described in any item light-coupled isolations of claim 2-7, which is characterized in that described and gate
Circuit processed include with door a, with door b, with door c and with door d；
It is described to be respectively connected to the DSP control chip with door a, described and door b, described and door c and described and door d pin 1,
It is described with door a, it is described with door b, described be respectively connected to the defeated of the optical coupling isolation circuit with door c and the pin 2 with door d
Enter end, it is described to be respectively connected to the IGBT driving electricity with door a, described and door b, described and door c and described and door d pin 3
Road module；
When the optical coupling isolation circuit is connected, the input terminal level of the optical coupling isolation circuit is dragged down, so that described control with door
Circuit closes hardware and closes the DSP control chip and control the IGBT drive circuit module shutdown.
9. the current foldback circuit of light-coupled isolation according to claim 8, which is characterized in that the IGBT drive circuit mould
Block input terminal is connected to the pin 3 with gate control circuit, and output end is connected to the open-minded of the inverter control inverter
And shutdown.
10. a kind of inverter, which is characterized in that the inverter include electrolytic capacitor, inverter bridge and, the claims
The current foldback circuit of the described in any item light-coupled isolations of 1-9；
The both ends of current sampling circuit in the current foldback circuit of the light-coupled isolation are connected to the cathode of the electrolytic capacitor
DC bus cathodal current is sampled with the emitter of the preceding bridge arm down tube of the inverter bridge.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910018088.2A CN109599843A (en) | 2019-01-09 | 2019-01-09 | A kind of current foldback circuit and inverter of light-coupled isolation |
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