CN215420223U

CN215420223U - Isolation driving circuit of power electronic switch device

Info

Publication number: CN215420223U
Application number: CN202120539350.0U
Authority: CN
Inventors: 陈旺
Original assignee: Jiangsu Electromechanical Co Ltd
Current assignee: Jiangsu Electromechanical Co Ltd
Priority date: 2021-03-16
Filing date: 2021-03-16
Publication date: 2022-01-04
Anticipated expiration: 2031-03-16

Abstract

The utility model discloses an isolation driving circuit of a power electronic switching device, which comprises a PWM (pulse-width modulation) central processing unit, an R9 pull-up resistor, an R10 current-limiting resistor, an R11 driving resistor, a C8 decoupling capacitor, a VS1 amplitude limiter, a U6 optical coupling isolation module, a U7 driving chip, a VD1 isolation diode, an IGBT (insulated gate bipolar translator) module, a 5V power supply, a +15V power supply and a-10V power supply, wherein a pin 2 of the U6 optical coupling isolation module is connected with the output end of the PWM central processing unit, a pin 3 is grounded, a pin 8 is connected with the 5V power supply, the 5V power supply is connected with a pin 16 of the U7 driving chip, a C8 decoupling capacitor is connected between a pin 5 and a pin 8 of the U6 optical coupling isolation module in parallel, the pin 8 is connected with a pin 13 of the U7 driving chip and is connected with an R9 pull-up resistor in series in the middle, a pin 5 of the U7 driving chip is connected with one end of the R10 current-limiting resistor, the U10 current-limiting resistor can drive the power electronic switching device, and the introduction and the impact of strong voltage can be avoided, and electronic components in the circuit are protected.

Description

Isolation driving circuit of power electronic switch device

Technical Field

The utility model belongs to the technical field of circuits for carrying out isolation driving on control signals of power electronic switching devices, and particularly relates to an isolation driving circuit of a power electronic switching device.

Background

In a traditional circuit, a central processing unit PWM driving signal voltage is low, a power electronic switching device cannot be directly driven to be normally conducted and closed, and strong voltage introduction and impact are easily caused to cause damage to valuable electronic components.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide an isolation driving circuit of a power electronic switching device, which aims to solve the problems that in the traditional circuit, a central processing unit PWM driving signal has low voltage, can not directly drive the power electronic switching device to be normally conducted and closed, and is easy to cause the introduction and the impact of strong voltage to cause the damage of valuable electronic components and the like.

The utility model realizes the purpose through the following technical scheme: the PWM driving circuit comprises a PWM central processing unit, an R9 pull-up resistor, an R10 current-limiting resistor, an R11 driving resistor, a C8 decoupling capacitor, a VS1 amplitude limiter, a U6 optical coupling isolation module, a U7 driving chip, a VD1 isolation diode, an IGBT module, a 5V power supply, a +15V power supply and a-10V power supply, wherein a pin 2 of the U6 optical coupling isolation module is connected with the output end of the PWM central processing unit, a pin 3 is grounded, a pin 8 is connected with the 5V power supply, the 5V power supply is connected with a pin 16 of the U7 driving chip, a C8 decoupling capacitor is connected between a pin 5 and a pin 8 of the U6 optical coupling isolation module in parallel, a pin 8 is connected with a pin 13 of the U7 driving chip and is connected with an R9 pull-up resistor in series, a pin 5 of the U7 driving chip is connected with one end of the R10 current-limiting resistor, a pin 4 is connected with one end of the +15V power supply, a pin 6 is connected with one end of the-10V power supply, the other end of the +15V power supply is connected with the other end of the-10V power supply, the other end of the R10 current-limiting resistor is connected with the base electrode of the IGBT module, a VS1 amplitude limiter is connected in parallel between the base electrode of the IGBT module and the 6 pins of the U7 driving chip, the 1 pin of the U7 driving chip is connected with one end of a VD1 isolation diode, the other end of the VD1 isolation diode is connected with one end of a R11 driving resistor, and the other end of the R11 driving resistor is connected with the collector electrode of the IGBT module.

Furthermore, the model of the U6 optical coupling isolation module is 6N137, so that the introduction and impact of strong voltage can be avoided.

Furthermore, the U7 driver chip is M57962L, and can drive the power electronic switching device.

Furthermore, the resistance of the R10 current-limiting resistor is 15 omega, and the current in the circuit can be controlled.

Furthermore, the resistance value of the R11 driving resistor is 100 omega, so that the circuit can be protected.

Further, the C8 decoupling capacitor is 0.1 muF, so that a stable power supply can be provided.

Has the advantages that: the utility model has reasonable design and strong practicability, the R9 pull-up resistor can output a current channel for a collector open-circuit output type circuit, the R10 current-limiting resistor limits the magnitude of the current of a branch circuit, the serially connected components are prevented from being burnt by overlarge current, the R11 driving resistor reduces the current in the branch circuit, the C8 decoupling capacitor can provide a relatively stable power supply, the VS1 amplitude limiter has the function of limiting the amplitude of an output signal within a certain range, the U6 optical coupling isolation module ensures that the two isolated circuits are not directly connected electrically, the interference caused by the connection of electricity is mainly prevented, particularly the low-voltage control circuit and the external high-voltage circuit, the U7 driving chip can play a driving role on a power electronic switching device, the VD1 isolation diode plays an isolation role on the conduction of voltage in a certain direction by utilizing the unidirectional conduction principle of the diode, the IGBT module has small driving power and the saturation voltage is reduced, this circuit can play isolation and drive effect like this, utilizes special switching device U7 driver chip to accomplish power electronic switching device and normally switches on, closes the pipe, for the introduction and the impact of avoiding strong voltage, still need increase the opto-coupler isolation circuit who comprises U6 opto-coupler isolation module between PWM central processing unit and the U7 driver chip again, so not only can be to power electronic switching device's drive, electronic components in the circuit has still been protected.

Drawings

FIG. 1 is a schematic diagram of an isolated driver circuit according to the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.

With reference to fig. 1, an isolation driving circuit of a power electronic switching device includes a PWM central processing unit, an R9 pull-up resistor, an R10 current-limiting resistor, an R11 driving resistor, a C8 decoupling capacitor, a VS1 amplitude limiter, a U6 optical coupling isolation module, a U7 driving chip, a VD1 isolation diode, an IGBT module, a 5V power supply, +15V power supply and a-10V power supply, a U6 optical coupling isolation module having a 2 pin connected to an output terminal of the PWM central processing unit, a 3 pin grounded, an 8 pin connected to the 5V power supply, a 5V power supply connected to a 16 pin of the U7 driving chip, a C8 decoupling capacitor connected in parallel between a 5 pin and an 8 pin of the U6 optical coupling isolation module, an 8 pin connected to a 13 pin of the U7 driving chip and a R9 pull-up resistor connected in series therebetween, a 5 pin of the U7 driving chip connected to one end of a R10 current-limiting resistor, a 4 pin connected to one end of a +15V power supply, a 6 pin connected to one end of the-10V power supply, the other end of the +15V power supply is connected with the other end of the-10V power supply, the other end of the R10 current-limiting resistor is connected with the base electrode of the IGBT module, a VS1 amplitude limiter is connected in parallel between the base electrode of the IGBT module and the 6 pin of the U7 driving chip, the 1 pin of the U7 driving chip is connected with one end of a VD1 isolation diode, the other end of the VD1 isolation diode is connected with one end of the R11 driving resistor, and the other end of the R11 driving resistor is connected with the collector electrode of the IGBT module.

The model of the U6 optical coupling isolation module is 6N137, introduction and impact of strong voltage can be avoided, the model of the U7 driving chip is M57962L, a driving effect on a power electronic switching device can be achieved, the resistance value of the R10 current-limiting resistor is 15 omega, current in a circuit can be controlled, the resistance value of the R11 driving resistor is 100 omega, the circuit can be protected, the C8 decoupling capacitor is 0.1 muF, and a stable power supply can be provided.

The working principle is as follows: according to the utility model, a power supply adopts a dual-power supply mode, a +15V power supply and a-10V power supply, when an IGBT module is overloaded (overvoltage and overcurrent) and the voltage of a collector of the IGBT module rises to be above 15V, a VD1 isolation diode is cut off, a pin 1 of a U7 driving chip is at a high level of 15V, a pin 5 is set to be at a low level, the IGBT module is cut off, meanwhile, a pin 8 of the U7 driving chip is set to be at a low level, a U6 optical coupling isolation module is enabled to work, a driving signal is enabled to stop, and a VS1 amplitude limiter is used for preventing the VD1 isolation diode from being broken down to damage the U7 driving chip; the VS1 amplitude limiter ensures that the base electrode of the IGBT module is not broken down, a special switching device U7 driving chip is used for completing normal conduction and tube closing of a power electronic switching device, and in order to avoid introduction and impact of strong voltage, an optical coupling isolation circuit formed by a U6 optical coupling isolation module is added between a PWM central processing unit and a U7 driving chip, so that the power electronic switching device can be driven, and electronic components in the circuit are protected.

It will be evident to those skilled in the art that the utility model is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the utility model being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims

1. An isolation driving circuit of a power electronic switching device comprises a PWM central processing unit, an R9 pull-up resistor, an R10 current-limiting resistor, an R11 driving resistor, a C8 decoupling capacitor, a VS1 amplitude limiter, a U6 optical coupling isolation module, a U7 driving chip, a VD1 isolation diode, an IGBT module, a 5V power supply, a +15V power supply and a-10V power supply, and is characterized in that: a pin 2 of the U6 optical coupling isolation module is connected with the output end of the PWM central processing unit, a pin 3 is grounded, a pin 8 is connected with the 5V power supply, the 5V power supply is connected with a pin 16 of the U7 driving chip, a C8 decoupling capacitor is connected between the pin 5 and the pin 8 of the U6 optical coupling isolation module in parallel, a pin 8 is connected with a pin 13 of the U7 driving chip and the middle of the pin is connected with a pull-up resistor R9 in series, a pin 5 of the U7 driving chip is connected with one end of the current-limiting resistor R10, a pin 4 is connected with one end of the +15V power supply, a pin 6 is connected with one end of the-10V power supply, the other end of the +15V power supply is connected with the other end of the-10V power supply, the other end of the current-limiting resistor R10 is connected with the base of the IGBT module, a VS1 amplitude limiter is connected between the base of the IGBT module and the pin 6 of the U7 driving chip in parallel, the 1 pin of U7 driver chip with VD1 keeps apart diode one end and is connected, VD1 keeps apart the diode other end with R11 driving resistance one end is connected, R11 driving resistance other end with the collector electrode of IGBT module is connected.

2. An isolated drive circuit for a power electronic switching device as claimed in claim 1, wherein: the model of the U6 optical coupling isolation module is 6N 137.

3. An isolated drive circuit for a power electronic switching device as claimed in claim 1, wherein: the model of the U7 driving chip is M57962L.

4. An isolated drive circuit for a power electronic switching device as claimed in claim 1, wherein: the resistance value of the R10 current-limiting resistor is 15 omega.

5. An isolated drive circuit for a power electronic switching device as claimed in claim 1, wherein: the resistance value of the R11 driving resistor is 100 omega.

6. An isolated drive circuit for a power electronic switching device as claimed in claim 1, wherein: the C8 decoupling capacitance was 0.1 μ F.