CN208094524U - A kind of driving device applied to IGBT - Google Patents

Abstract

The utility model discloses a kind of IGBT driving devices; in such a way that signal coupler is separately connected drive signal pio chip and output unit circuit; it solves the problems, such as driving device while driving that wrong sequential in the application of multiple IGBT, shutdown spike be excessive, parallel current-sharing; and with small; reliability is high, and short-circuit protection, under-voltage protection can be realized in conjunction with peripheral components; soft switching monitors the effect of input signal in real time.

Description

A kind of driving device applied to IGBT

Technical field

The utility model is related to IGBT control technology fields more particularly to a kind of driving devices applied to IGBT.

Background technology

IGBT, i.e. insulated gate bipolar transistor are answered by what double pole triode and insulating gate type field effect tube formed Full-control type voltage driven type power semiconductor is closed, has the high input impedance of MOSFET and two side of low conduction voltage drop of GTR concurrently The advantages of face.IGBT is the durability and service life of IGBT in power electronic system during very important power semiconductor It is related to the reliability of entire power electronic system.Therefore, reliable IGBT protection circuit be the key that power electronic system it Place.

Modularization with IGBT and intelligence, developer drive high-performance IGBT module using integrated circuit.But When there is also driving multiple IGBT simultaneously, there are wrong sequential, shutdown spike are excessive, the problems such as parallel current-sharing.

Utility model content

For the above problem existing for IGBT control technology fields in the prior art, now provide a kind of applied to IGBT's Driving device.

Specific technical solution is as follows：

A kind of driving device applied to IGBT includes：Drive signal pio chip, at least one signal coupler, at least One output unit circuit, multigroup circuit connect pin；

Each signal coupler is correspondingly connected with an output unit circuit, each signal coupler with The drive signal pio chip electrical connection, each output unit circuit is connected pin and corresponded to by circuit described in one group to be connected Meet an IGBT；

Each output unit circuit is correspondingly connected with the corresponding IGBT by turning off pin and opening pin respectively Grid；

Each IGBT corresponds to a pulse width modulating signal input pin, the pulse width modulating signal input Pin is connect with the drive signal pio chip, and the pulse width modulating signal input pin connects the driving device Host computer.

Each IGBT is correspondingly connected with a failure detector, includes one complicated in each failure detector Programmable logic device, each failure detector are all connected with the drive signal pio chip.

Preferably, the failure detector connects source electrode pin, and the source electrode pin is corresponded to by the first capacitance connection The IGBT source electrode.

Preferably, the failure detector connects drain pin, and the drain pin is connecting a high-voltage diode just Pole, the cathode of the high-voltage diode connect the drain electrode of the corresponding IGBT of the failure detector.

Preferably, the failure detector connects the corresponding pulse width modulating signal input pin.

Preferably, the drive signal pio chip is also connected with a failure feedback pin, the failure feedback pin connection The host computer.

Preferably, the driving device further includes power input pin and common ground pin, the power input pin A voltage source is connected, the common ground pin connects a ground terminal；

The power input pin and the common ground pin also distinguish the drive signal pio chip, the signal Coupler, the output unit circuit；

The capacitance of three 10uF of parallel connection between the power input pin and the common ground pin.

Preferably, the signal coupler is photoelectrical coupler.

Preferably, it is in series with first resistor between shutdown pin and the grid of the corresponding IGBT；

Described open is in series with second resistance between pin and the grid of the corresponding IGBT.

Preferably, clamp diode, the second capacitance, 3rd resistor are also parallel between the grid and source electrode of the IGBT.

Above-mentioned technical proposal has the following advantages that or advantageous effect：

The side of the drive signal pio chip and the output unit circuit is separately connected using the signal coupler Formula solves driving device while driving that wrong sequential in the application of multiple IGBT, shutdown spike are excessive, parallel current-sharing ask Short-circuit protection can be realized in conjunction with peripheral components in topic, and with small, reliability is high, under-voltage protection, soft switching, in real time Monitor the effect of input signal.

Description of the drawings

Fig. 1 is a kind of overall structure diagram of the embodiment of driving device applied to IGBT of the utility model；

Fig. 2 is a kind of structural schematic diagram of the embodiment of driving device applied to IGBT of the utility model；

Fig. 3 is a kind of structural schematic diagram for the embodiment being applied to three level neutral-point-clamped topological circuits of the utility model.

Specific implementation mode

The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are in the premise for not making creative work Lower obtained every other embodiment, shall fall within the protection scope of the present invention.

It should be noted that in the absence of conflict, the feature in the embodiments of the present invention and embodiment can To be combined with each other.

The utility model is described in further detail in the following with reference to the drawings and specific embodiments, but not as the utility model It limits.

In a kind of preferred embodiment of the utility model, according to Fig. 1 and Fig. 2, a kind of driving applied to IGBT fills Setting 1 includes：Drive signal pio chip 2, at least one signal coupler 3, at least one output unit circuit 4, multigroup circuit Connect pin；

Each signal coupler 3 is correspondingly connected with an output unit circuit 4, and each signal coupler 3 is and drive signal Pio chip 2 is electrically connected, and each output unit circuit 4 connects pin by set of circuits and is correspondingly connected with an IGBT；

Each output unit circuit 4 is respectively by turning off pin N4 and opening the grid that pin N6 is correspondingly connected with corresponding IGBT Pole G；

Each IGBT corresponds to a pulse width modulating signal input pin N0, pulse width modulating signal input pin N0 It is connect with drive signal pio chip 2, the host computer of pulse width modulating signal input pin N0 connections driving device 1.

Specifically, in the present embodiment, drive signal pio chip 2 is obtained by pulse width modulating signal input pin N0 The command signal that host computer is sent, drive signal pio chip 2 is according to the pulse width modulating signal received to corresponding letter Number coupler 3 sends IGBT control instructions, and signal coupler 3 is defeated for sending IGBT control instructions to output unit circuit 4 Go out element circuit 4 receive signal coupler 3 transmission control instruction, by turn off pin N4 and open pin N6 control to The grid G output drive signal of IGBT, to reach the working condition of control IGBT.

Specifically, in the present embodiment, multiple signal couplers 3, each signal coupling are connected using drive signal pio chip 2 Clutch 3 respectively connects an output unit circuit 4 and a corresponding IGBT, realizes while manipulating the effect of multiple IGBT.It adopts With signal coupler 3 in such a way that drive signal pio chip 2 and output unit circuit 4 are isolated, the driving of IGBT is believed Number and control signal isolation, realize and avoid wrong sequential, reduce shutdown spike, overcome the technique effect of parallel current-sharing.

In a kind of preferred embodiment of the utility model, according to Fig. 1, each IGBT is correspondingly connected with a fault detect Device (is not shown), includes a complicated programmable logic device, each failure detector in each failure detector It is all connected with drive signal pio chip 2.

Specifically, it in the present embodiment, is being worked using the complicated programmable logic device detection IGBT in failure detector State sends the signal of IGBT exceptions, driving letter to drive signal pio chip 2 after detecting IGBT working condition exceptions Number pio chip 2 controls the state of corresponding IGBT according to the signal of IGBT exceptions.

In a kind of preferred embodiment of the utility model, according to Fig. 1, failure detector connects source electrode pin N1, Source electrode pin N1 connects the source electrode E of corresponding IGBT by the first capacitance C1.

Specifically, in the present embodiment, failure detector connects the source electrode E of IGBT, and the source electrode E for detecting IGBT is No to be in under-voltage condition, failure detector judgement has occurred under-voltage fault, and failure detector is to drive signal pio chip 2 Under-voltage signal is sent, drive signal pio chip 2 controls the state of IGBT according to under-voltage signal, to realize the effect of under-voltage protection Fruit, the first capacitance C1 is for preventing false triggering.

In a kind of preferred embodiment of the utility model, according to Fig. 1, failure detector connects drain pin N5, The anode of one high-voltage diode D1 of drain pin N5 connections, the cathode connecting fault detection device of high-voltage diode D1 are corresponding The drain electrode C of IGBT.

Specifically, in the present embodiment, drain electrode C voltage when failure detector is opened by detecting IGBT judges IGBT Whether short-circuit condition or over-current state are in.Drain electrode C voltage is detected by high-voltage diode D1, when drain electrode C voltage is more than Given threshold, high-voltage diode D1 is breakdown, and complicated programmable logic device judgement IGBT is in short trouble, failure detector Short-circuit signal is sent to drive signal pio chip 2, drive signal pio chip 2 controls IGBT according to short-circuit signal and turns off, from And realize the effect of short-circuit protection and overcurrent protection.

In a kind of preferred embodiment of the utility model, it is defeated that failure detector connects corresponding pulse width modulating signal Enter pin N0.

Specifically, in the present embodiment, pulse width modulating signal input pin N0 corresponds to an IGBT, failure detector Pulse width modulating signal pulsewidth is monitored in real time by connecting pulse width modulating signal input pin N0.As continuously supervised several times Measuring pulse width modulating signal pulsewidth, less than the time interval of some preset value or several continuous rising edges to be shorter than some pre- If after value, there are pulse exceptions for complicated programmable logic device judgement.

In a kind of preferred embodiment of the utility model, according to Fig. 1 and Fig. 2, drive signal pio chip 2 is also connected with One failure feedback pin N7, failure feedback pin N7 connection host computers.

Specifically, in the present embodiment, after failure detector detects pulse exception, short trouble, under-voltage fault, failure Fault-signal is sent to drive signal pio chip 2 by detection device, and drive signal pio chip 2 makes corresponding signal control System, and fault-signal is enough fed back into host computer by failure feedback pin N7.

In a kind of preferred embodiment of the utility model, according to Fig. 1 and Fig. 2, driving device 1 further includes power input One voltage source of pin N8 and common ground pin N9, power input pin N8 connection, one ground terminal of common ground pin N9 connections；

Power input pin N8 and common ground pin N9 also respectively drives signal pio chip 2, signal coupler 3, defeated Go out element circuit 4；

The capacitance of three 10uF of parallel connection between power input pin N8 and common ground pin N9.

Specifically, in the present embodiment, voltage source is powered by connecting power input pin N8 for driving device 1, and is provided The Support Capacitor of 30uF or so.Ground terminal is that driving device 1 provides reference ground by connecting common ground pin N9.

In a kind of preferred embodiment of the utility model, signal coupler 3 is photoelectrical coupler.

Specifically, in the present embodiment, photoelectrical coupler, also known as optocoupler, using light as media transmission electric signal.It to input, Output electric signal has good buffer action.It can be very good to realize 2 He of drive signal pio chip using photoelectrical coupler Output unit circuit 4 carries out isolation communication.

In a kind of preferred embodiment of the utility model, according to Fig. 1, the grid of pin N4 and corresponding IGBT are turned off First resistor R1 is in series between G；

It opens and is in series with second resistance R2 between pin N6 and the grid G of corresponding IGBT.

Specifically, in the present embodiment, first resistor R1 is shutdown resistance, and second resistance R2 is open resistance, using output Element circuit 4 connects the grid G of IGBT by two resistance, to control the switching speed of IGBT.Output unit circuit 4 uses Above structure drives IGBT to start soft switching, and IGBT is slowly turned off.When IGBT occurs short-circuit straight-through, when ensureing short circuit Between be no more than 10us under the premise of, by slowly reducing gate voltage, to ensure that igbt chip will not be burnt because of excess temperature, keep away Exempt from the safety that due to voltage spikes when shutdown ensures IGBT.

In a kind of preferred embodiment of the utility model, according to Fig. 1, between the grid G and source electrode E of IGBT also simultaneously It is associated with clamp diode D2, the second capacitance C2,3rd resistor R3, the gate voltage under the limiting conditions such as short circuit can be prevented to be lifted It is excessively high.

In a kind of preferred embodiment of the utility model, according to Fig. 1 and Fig. 2, driving device 1 was additionally provided with reviewing knowledge already acquired Hinder pin N10.Specifically, the circuit of excess temperature fault detect, excess temperature failure can also be set in application process in driving device 1 Pin N10 may be implemented to IGBT whether excess temperature is monitored.

In a kind of preferred embodiment of the utility model, according to Fig.3, in three level neutral-point-clamped topological circuit applications In, while two driving devices 1 are set, each driving device 1 respectively connects two IGBT.Driving device 1 is also applied for tri- electricity of NPC Multiple parallel connections of flat-die block.

It these are only the utility model preferred embodiment, be not intended to limit the embodiment and protection of the utility model Range should can appreciate that all with the utility model specification and diagramatic content institute to those skilled in the art The equivalent replacement made and obviously change obtained scheme, the scope of protection of the utility model should all be included in It is interior.

Claims (10)

1. a kind of driving device applied to IGBT, which is characterized in that including：Drive signal pio chip, at least one signal Coupler, at least one output unit circuit, multigroup circuit connect pin；

Each signal coupler is correspondingly connected with an output unit circuit, each signal coupler with it is described Drive signal pio chip is electrically connected, and each output unit circuit connects pin by circuit described in one group and is correspondingly connected with one A IGBT；

Each output unit circuit grid by turning off pin with opening pin and connect the corresponding IGBT respectively；

Each IGBT corresponds to a pulse width modulating signal input pin, the pulse width modulating signal input pin It is connect with the drive signal pio chip, the pulse width modulating signal input pin connects the upper of the driving device Machine.

2. driving device according to claim 1, which is characterized in that each IGBT is correspondingly connected with a fault detect Device, interior each failure detector includes a complicated programmable logic device, and each failure detector is all connected with The drive signal pio chip.

3. driving device according to claim 2, which is characterized in that the failure detector connects source electrode pin, institute State source electrode of the source electrode pin by the corresponding IGBT of the first capacitance connection.

4. driving device according to claim 2, which is characterized in that the failure detector connects drain pin, institute The anode that drain pin connects a high-voltage diode is stated, the cathode of the high-voltage diode connects the failure detector and corresponds to The IGBT drain electrode.

5. driving device according to claim 2, which is characterized in that the failure detector connects the corresponding arteries and veins Rush bandwidth modulation signals input pin.

6. driving device according to claim 1, which is characterized in that the drive signal pio chip is also connected with a failure Feedback pin, the failure feedback pin connect the host computer.

7. driving device according to claim 1, which is characterized in that further include power input pin and common ground pipe Foot, the power input pin connect a voltage source, and the common ground pin connects a ground terminal；

The power input pin and the common ground pin also distinguish the drive signal pio chip, signal coupling Device, the output unit circuit；

The capacitance of three 10uF of parallel connection between the power input pin and the common ground pin.

8. driving device according to claim 1, which is characterized in that the signal coupler is photoelectrical coupler.

9. driving device according to claim 1, which is characterized in that

It is in series with first resistor between shutdown pin and the grid of the corresponding IGBT；

Described open is in series with second resistance between pin and the grid of the corresponding IGBT.

10. driving device according to claim 1, which is characterized in that also parallel connection between the grid and source electrode of the IGBT There are clamp diode, the second capacitance, 3rd resistor.