CN211352033U

CN211352033U - Insulated Gate Bipolar Transistor (IGBT) driving circuit's isolation power supply

Info

Publication number: CN211352033U
Application number: CN202020091873.9U
Authority: CN
Inventors: 夏军
Original assignee: Shenzhen Sunray Electronics Co ltd
Current assignee: Shenzhen Sunray Electronics Co ltd
Priority date: 2020-01-16
Filing date: 2020-01-16
Publication date: 2020-08-25
Anticipated expiration: 2030-01-16

Abstract

The utility model discloses a IGBT drive circuit's isolation power, drive opto-coupler OP1 including photovoltaic effect, current-limiting resistance Rf, level and smooth electric capacity Co, stabilivolt Zo, current-limiting resistance Ro and driver U1, photovoltaic effect drive opto-coupler OP1 input side is the LED light source, photovoltaic effect drive opto-coupler OP1 one side is equipped with pin1, pin2, four groups of pins of pin3 and pin4, the opposite side is equipped with pin5, pin6, four groups of pins of pin7 and pin8, current-limiting resistance Rf one end is connected with the anodal Vin electricity of incoming signal, the other end is connected with pin2 electricity, the electricity is connected with output filter electric capacity Co between pin5 and the pin7, stabilivolt Zo negative pole is connected with pin5 electricity; the utility model discloses a photovoltaic effect drive opto-coupler, occupation space is very little, also need not extra shock-resistant measure in the design, through with filter capacitance, zener diode's cooperation provides reliable and stable power for the IGBT driver, what the power adopted is the optical isolation technique, does not have high frequency electromagnetic radiation's problem, also can not receive space electromagnetic signal's interference.

Description

Insulated Gate Bipolar Transistor (IGBT) driving circuit's isolation power supply

Technical Field

The utility model relates to a IGBT drive circuit technical field specifically is an IGBT drive circuit's isolation power.

Background

I0BT (Insulated Gate Bipolar Transistor), an Insulated Gate Bipolar Transistor, is a composite fully-controlled voltage-driven power semiconductor device composed of BJT (Bipolar junction Transistor) and MOS (Insulated Gate field effect Transistor), and has the advantages of both high input impedance of MOSFET and low on-state voltage drop of GTR. The GTR saturation voltage is reduced, the current carrying density is high, but the driving current is large; the MOSFET has small driving power, high switching speed, large conduction voltage drop and small current carrying density. The IGBT integrates the advantages of the two devices, and has small driving power and reduced saturation voltage. The method is very suitable for being applied to the fields of current transformation systems with direct-current voltage of 600V or more, such as alternating-current motors, frequency converters, switching power supplies, lighting circuits, traction transmission and the like.

As shown in fig. 1, the IGBT driver circuit is a conventional IGBT driver circuit in the prior art, and the upper frame is a power supply part of the IGBT driver circuit, namely, a flyback isolation power supply, and provides an isolation power supply VCC2 for a driver U1; in the figure, X1 is a flyback transformer, SW is a flyback power supply PWM control signal, and is generally provided by a driver chip U1; c1 is input filter capacitor connected between the positive and negative poles of input power supply; d1 is a voltage regulator tube, D2 is a fast recovery diode, and D1 and D2 are connected in series at two ends of a primary coil of a transformer X1; d3 is output rectifying diode, the positive pole of D3 connects with one end of the secondary coil of transformer X1, the negative pole of D3 connects with the negative pole of output filter capacitor C1 and output side voltage-regulator tube D4 to form the positive pole point of power VCC2, the other side of C1 connects with the negative pole of VCC2, the resistance R4 and D4 connects in series between the positive and negative poles of VCC 2.

In fig. 1, the stable and smooth operation of the power signal VCC2 is important for the normal operation of the whole driving circuit, and the drawback of using the transformer X1 to form the isolated power supply is: the transformer is a magnetic device, and when the transformer operates in a high-frequency switching state, electromagnetic radiation (EMI) is generated, and the output of the transformer is also easily affected by the surrounding electromagnetic environment, so that the secondary power supply VCC2 fluctuates. On the other hand, the transformer occupies a large space, and has limited anti-vibration capability in mobile terminals such as automobiles, or needs additional fixing measures.

Based on this, the utility model designs an IGBT drive circuit's isolation power to solve the above-mentioned problem.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide an IGBT drive circuit's isolation power to solve the problem that proposes among the above-mentioned background art.

In order to achieve the above object, the utility model provides a following technical scheme: an isolated power supply of an IGBT driving circuit comprises a photovoltaic effect driving optocoupler OP1, a current-limiting resistor Rf, a smoothing capacitor Co, a voltage-stabilizing tube Zo, a current-limiting resistor Ro and a driver U1, the input side of the photovoltaic effect driving optical coupler OP1 is an LED light source, one side of the photovoltaic effect driving optical coupler OP1 is sequentially provided with four groups of pins of pin1, pin2, pin3 and pin4 from top to bottom, the other side of the photovoltaic effect driving optical coupler OP1 is sequentially provided with four groups of pins of pin5, pin6, pin7 and pin8 from bottom to top, the pin2 is an LED anode, the pin3 is an LED cathode, one end of the current-limiting resistor Rf is electrically connected with the input signal anode Vin, the other end of the current-limiting resistor Rf is electrically connected with the pin2, the pin3 is electrically connected with an input side ground signal GND1, an output filter capacitor Co is electrically connected between the pin5 and the pin7, the cathode of the voltage-stabilizing tube Zo is electrically connected with a pin5, the anode of the voltage-stabilizing tube Zo is connected with a current-limiting resistor Ro in series, the other end of the current-limiting resistor Ro is electrically connected to the ground GND2 of the secondary power supply VCC 2.

Preferably, the pins 1 and 4 are both flying pins.

Preferably, the pins 6 and 8 are both flying pins.

Compared with the prior art, the beneficial effects of the utility model are that: the utility model adopts the photovoltaic effect driving optical coupler, the size of the photovoltaic effect driving optical coupler is only an SO-8 packaged IC, the occupied space is very small, no extra shock-proof measure is needed in the design, and the voltage stabilizing diode is matched with the filter capacitor to provide a stable and reliable power supply for the IGBT driver; the power supply adopts an optical isolation technology, so that the problem of high-frequency electromagnetic radiation does not exist, the interference of space electromagnetic signals can not be caused, and the self common-mode interference filtering capability is also strong.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a prior art circuit schematic;

fig. 2 is a schematic circuit diagram of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.

Referring to fig. 2, the present invention provides an isolation power supply for an IGBT driving circuit, comprising: an isolation power supply of an IGBT driving circuit comprises a photovoltaic effect driving optical coupler OP1, a current-limiting resistor Rf, a smoothing capacitor Co, a voltage-stabilizing tube Zo, a current-limiting resistor Ro and a driver U1, wherein an input side of the photovoltaic effect driving optical coupler OP1 is an LED light source, one side of the photovoltaic effect driving optical coupler OP1 is sequentially provided with four groups of pins, namely Pin1, Pin2, Pin3 and Pin4 from top to bottom, the other side of the photovoltaic effect driving optical coupler OP1 is sequentially provided with four groups of pins, namely Pin5, Pin6, Pin7 and Pin8 from bottom to top, the Pin2 is an LED anode, the Pin3 is an LED cathode, one end of the current-limiting resistor Rf is electrically connected with an input signal anode Vin, the other end of the current-limiting resistor Rf is electrically connected with the Pin2, the Pin3 is electrically connected with an input side ground signal GND1, and when input side current Iin of the photovoltaic effect driving optical coupler OP1 reaches a rated value of the LED and is stable, an output filter capacitor Co is electrically connected between the pin5 and the pin7, the cathode of the voltage stabilizing tube Zo is electrically connected with the pin5, the anode of the voltage stabilizing tube Zo is connected with the current limiting resistor Ro in series, the other end of the current limiting resistor Ro is electrically connected with the ground GND2 of the secondary power supply VCC2, Vo-is the ground of the secondary power supply VCC2, and Vo + is the anode of the VCC 2.

The pins 1 and 4 are both flying pins; pins 6 and 8 are both flying pins.

In the description herein, references to the description of "one embodiment," "an example," "a specific example," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The preferred embodiments of the present invention disclosed above are intended only to help illustrate the present invention. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and its practical applications, to thereby enable others skilled in the art to best understand the invention for and utilize the invention. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. An isolated power supply of an IGBT driving circuit is characterized in that: the photovoltaic effect drive optical coupler comprises a photovoltaic effect drive optical coupler OP1, a current-limiting resistor Rf, a smoothing capacitor Co, a voltage-regulator tube Zo, a current-limiting resistor Ro and a driver U1, wherein an input side of the photovoltaic effect drive optical coupler OP1 is an LED light source, one side of the photovoltaic effect drive optical coupler OP1 is sequentially provided with four groups of pins, namely pin1, pin2, pin3 and pin4 from top to bottom, the other side of the photovoltaic effect drive optical coupler OP1 is sequentially provided with four groups of pins, namely pin5, pin6, pin7 and pin8 from bottom to top, the pin2 is an LED anode, the pin3 is an LED cathode, one end of the current-limiting resistor Rf is electrically connected with an input signal anode Vm, the other end of the current-limiting resistor Rf is electrically connected with a pin2, the pin3 is electrically connected with an input-side ground signal GND1, an output filter capacitor Co is electrically connected between the pin5 and the pin7, the cathode of the voltage-regulator tube Zo is electrically.

2. The isolated power supply of the IGBT driving circuit as claimed in claim 1, wherein: pins 1 and 4 are both flying pins.

3. The isolated power supply of the IGBT driving circuit as claimed in claim 1, wherein: pins 6 and 8 are both flying pins.