阅读说明：本技术 一种应用于绝缘栅双极型晶体管igbt的驱动电路 (Drive circuit applied to insulated gate bipolar transistor IGBT ) 是由 施源 陈颖 于 2020-06-17 设计创作，主要内容包括：本发明提供一种应用于绝缘栅双极型晶体管IGBT的驱动电路,所述电路包括：驱动电路包括脉冲源电路、第一功率放大电路及第二功率放大电路,其中：脉冲源电路,用于分别向第一功率放大电路和第二功率放大电路提供脉冲电压；第一功率放大电路,用于将脉冲电压放大第一倍数后输入到IGBT的栅极；第二功率放大电路,用于在IGBT的集电极电流处于第一阶段和第三阶段时,对脉冲电压放大第二倍数后输入到IGBT的栅极。利用本发明提供的驱动电路可以实现对IGBT开通过程的优化控制,通过对IGBT的不同时期的状态进行优化处理,以减小其开通时间和开关损耗。(The invention provides a drive circuit applied to an Insulated Gate Bipolar Transistor (IGBT), which comprises: the drive circuit comprises a pulse source circuit, a first power amplification circuit and a second power amplification circuit, wherein: the pulse source circuit is used for respectively providing pulse voltage for the first power amplifying circuit and the second power amplifying circuit; the first power amplification circuit is used for amplifying the pulse voltage by a first multiple and inputting the pulse voltage to the grid of the IGBT; and the second power amplification circuit is used for amplifying the pulse voltage by a second multiple and inputting the pulse voltage to the grid of the IGBT when the collector current of the IGBT is in the first stage and the third stage. The drive circuit provided by the invention can realize the optimized control of the IGBT switching-on process, and reduces the switching-on time and the switching loss of the IGBT by optimizing the states of the IGBT in different periods.)

1. The utility model provides a be applied to insulated gate bipolar transistor IGBT's drive circuit which characterized in that, drive circuit includes pulse source circuit, first power amplifier circuit and second power amplifier circuit, wherein:

the pulse source circuit is used for respectively providing pulse voltages for the first power amplifying circuit and the second power amplifying circuit;

the first power amplifying circuit is used for amplifying the pulse voltage by a first multiple and inputting the amplified pulse voltage to a grid electrode of the IGBT;

the second power amplifying circuit is used for amplifying the pulse voltage by a second multiple and inputting the pulse voltage to the grid electrode of the IGBT when the collector current of the IGBT is in a first stage and a third stage, wherein the first stage is an IGBT turn-on stage in which the collector current is zero, and the third stage is an IGBT turn-on stage in which the collector current is constant non-zero voltage.

2. The drive circuit according to claim 1, wherein the second power amplifying circuit comprises: emitter stray inductance voltage detection circuitry, supplementary signal processing circuit and the auxiliary power amplifier circuit of charging, wherein:

the emitter stray inductance voltage detection circuit is used for detecting the collector current and the stray inductance L of the IGBT_SEquivalent voltage amplification, wherein the amplified voltage is input to an auxiliary charging signal processing circuit;

the auxiliary charging signal processing circuit is used for performing logical AND operation on the amplified voltage and the pulse voltage after the amplified voltage is subjected to logical NOT operation, and inputting the obtained voltage to the auxiliary power amplifying circuit;

and the auxiliary power amplifying circuit is used for carrying out second-time amplification on the pulse voltage and inputting the pulse voltage to the grid electrode of the IGBT.

3. The driving circuit of claim 2, wherein the auxiliary charging signal processing circuit comprises:

the logic not gate is used for outputting input voltage which does not exceed the threshold voltage of the logic not gate into pulse voltage and outputting the input voltage which exceeds the threshold voltage of the logic not gate into zero voltage;

and the logic AND gate is used for converting the output of the logic NOT gate and the pulse voltage into a logic signal through threshold voltage and carrying out AND operation, and when the obtained logic signal is 1, the pulse voltage is input to the auxiliary power amplifying circuit.

4. The driving circuit according to claim 1, further comprising:

an equivalent inductance detection circuit connected with the emitter and collector of the IGBT and used for detecting the equivalent stray inductance L of the conductor in the IGBT_S。

5. The drive circuit according to claim 2,

the amplification factor of the emitter stray inductance voltage detection circuit to the equivalent voltage is the factor corresponding to the equivalent voltage amplified to the threshold voltage.

6. The driving circuit according to claim 2, wherein the auxiliary power amplifying circuit is a push-pull amplifying type circuit.

7. The drive circuit of claim 1, further comprising a current blocking diode, wherein:

the input end of the choke diode is connected with the auxiliary power amplifying circuit, and the output end of the choke diode is connected with the grid of the IGBT.

8. A method for increasing the turn-on speed of an IGBT, the method comprising:

amplifying the pulse voltage by a first multiple by using a first power amplification circuit and inputting the pulse voltage to a grid electrode of the IGBT;

and amplifying the pulse voltage by a second multiple and inputting the pulse voltage to the grid of the IGBT by using a second power amplification circuit when the collector current of the IGBT is in a first stage and a third stage, wherein the first stage is an IGBT turn-on stage in which the collector current is zero, and the third stage is an IGBT turn-on stage in which the collector current is constant non-zero voltage.

9. The method of claim 8, further comprising:

and when the collector current of the IGBT is in the second stage, the second power amplification circuit amplifies the zero voltage by a second multiple and inputs the zero voltage to the grid of the IGBT.

10. The method of claim 8, wherein the step of amplifying the pulse voltage by a second multiple and inputting the amplified pulse voltage to the gate of the IGBT by using a second power amplification circuit when the collector current of the IGBT is in the first phase and the third phase comprises:

the collector current and the stray inductance L of the IGBT are detected by an emitter stray inductance voltage detection circuit_SEquivalent voltage amplification, wherein the amplified voltage is input to an auxiliary charging signal processing circuit;

performing logical negation on the amplified voltage by using the auxiliary charging signal processing circuit, performing logical AND operation on the amplified voltage and the pulse voltage, and inputting the obtained voltage to an auxiliary power amplifying circuit;

and performing second-time amplification on the pulse voltage by using the auxiliary power amplification circuit, and inputting the pulse voltage to the grid of the IGBT.

11. An apparatus for increasing the turn-on speed of an IGBT, wherein the apparatus comprises a processor and a memory, the memory stores a computer program, the processor is used for executing the computer program in the memory, and the computer program is used for realizing the method for increasing the turn-on speed of the IGBT according to any one of claims 8 to 10 when executed.

12. The device for improving the turn-on speed of the IGBT is characterized by comprising the following modules:

the first amplification module is used for amplifying the pulse voltage by a first multiple by using a first power amplification circuit and inputting the pulse voltage to a grid electrode of the IGBT;

and the second amplification module is used for amplifying the pulse voltage by a second multiple and inputting the amplified pulse voltage to the grid electrode of the IGBT when the collector current of the IGBT is in a first stage and a third stage by using a second power amplification circuit, wherein the first stage is an IGBT turn-on stage in which the collector current is zero, and the third stage is an IGBT turn-on stage in which the collector current is constant non-zero voltage.

13. A computer readable storage medium, characterized in that the computer readable storage medium stores computer instructions, which when executed by a processor, implement the method for increasing the turn-on speed of the IGBT according to any one of claims 8 to 10.

Technical Field

The invention relates to the field of drive circuits of semiconductor elements, in particular to a drive circuit applied to an Insulated Gate Bipolar Transistor (IGBT).

Background

An Insulated Gate Bipolar Transistor (IGBT) is a device formed by combining an Insulated Gate field effect Transistor (MOSFET) and a Bipolar Junction Transistor (BJT), has the advantages of both high input impedance of the MOSFET and low conduction voltage drop of the BJT, is a leading device of medium and small power electronic equipment, and is suitable for application in 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 drives and the like.

In order to realize various functions of the IGBT, an IGBT driving circuit needs to be designed to process signals of the control circuit (for example, isolation transmission, level adjustment, power amplification, and the like), and the high-quality IGBT driving circuit can optimize the switching characteristics of the IGBT, reduce turn-off time and loss, and improve system efficiency.

In a conventional IGBT switch driving circuit, a gate resistance Rg is changed, a gate driving current Ig is controlled to reduce turn-off time and loss, when Rg is smaller, the turn-on and turn-off speed of an IGBT device is higher, but due to the existence of parasitic inductance, when the gate resistance Rg is adjusted, a larger voltage overshoot phenomenon can be generated on a direct current bus, and the device can be damaged; when Rg is large, the gate current is small and the turn-off time is long, resulting in large losses and electromagnetic interference. In order to improve the switching frequency of the IGBT, reduce switching loss, improve circuit conversion efficiency, and ensure reliable turn-off of the device under a fault condition, the optimal design of the driving circuit faces a great challenge.

Disclosure of Invention

The invention provides a driving circuit applied to an Insulated Gate Bipolar Transistor (IGBT), which is used for solving the problems that the existing IGBT is long in turn-on time and large in turn-on loss, the existing IGBT optimizing turn-on time only focuses on grid voltage, and actually key parameters of various inductors also have important influence on the turn-on of the IGBT.

The invention provides a driving circuit applied to an Insulated Gate Bipolar Transistor (IGBT), which comprises a pulse source circuit, a first power amplifying circuit and a second power amplifying circuit, wherein:

the pulse source circuit is used for respectively providing pulse voltages for the first power amplifying circuit and the second power amplifying circuit;

the first power amplifying circuit is used for amplifying the pulse voltage by a first multiple and inputting the amplified pulse voltage to a grid electrode of the IGBT;

the second power amplifying circuit is used for amplifying the pulse voltage by a second multiple and inputting the pulse voltage to the grid electrode of the IGBT when the collector current of the IGBT is in a first stage and a third stage, wherein the first stage is an IGBT turn-on stage in which the collector current is zero, and the third stage is an IGBT turn-on stage in which the collector current is constant non-zero voltage.

Optionally, the second power amplifying circuit includes: emitter stray inductance voltage detection circuitry, supplementary signal processing circuit and the auxiliary power amplifier circuit of charging, wherein:

the emitter stray inductance voltage detection circuit is used for amplifying the voltage equivalent to the collector current and the stray inductance LS of the IGBT and inputting the amplified voltage into the auxiliary charging signal processing circuit;

the auxiliary charging signal processing circuit is used for performing logical AND operation on the amplified voltage and the pulse voltage after the amplified voltage is subjected to logical NOT operation, and inputting the obtained voltage to the auxiliary power amplifying circuit;

and the auxiliary power amplifying circuit is used for carrying out second-time amplification on the pulse voltage and inputting the pulse voltage to the grid electrode of the IGBT.

Optionally, the auxiliary charging signal processing circuit includes:

the logic not gate is used for outputting input voltage which does not exceed the threshold voltage of the logic not gate into pulse voltage and outputting the input voltage which exceeds the threshold voltage of the logic not gate into zero voltage;

and the logic AND gate is used for converting the output of the logic NOT gate and the pulse voltage into a logic signal through threshold voltage and carrying out AND operation, and when the obtained logic signal is 1, the pulse voltage is input to the auxiliary power amplifying circuit.

Optionally, the driving circuit further comprises:

and the equivalent inductance detection circuit is connected with the emitter and the collector of the IGBT and is used for detecting equivalent stray inductance LS of a conductor in the IGBT.

Optionally, the amplification factor of the emitter stray inductance voltage detection circuit to the equivalent voltage is a factor corresponding to the amplification factor of the equivalent voltage to the threshold voltage.

Optionally, the auxiliary power amplifying circuit is a push-pull amplifying type circuit.

Optionally, the driving circuit further comprises a current blocking diode, wherein:

the input end of the choke diode is connected with the auxiliary power amplifying circuit, and the output end of the choke diode is connected with the grid of the IGBT.

The second aspect of the present invention provides a method for increasing the turn-on speed of an IGBT, the method comprising:

amplifying the pulse voltage by a first multiple by using a first power amplification circuit and inputting the pulse voltage to a grid electrode of the IGBT;

and amplifying the pulse voltage by a second multiple and inputting the pulse voltage to the grid of the IGBT by using a second power amplification circuit when the collector current of the IGBT is in a first stage and a third stage, wherein the first stage is an IGBT turn-on stage in which the collector current is zero, and the third stage is an IGBT turn-on stage in which the collector current is constant non-zero voltage.

Optionally, the method further comprises:

and when the collector current of the IGBT is in the second stage, the second power amplification circuit amplifies the zero voltage by a second multiple and inputs the zero voltage to the grid of the IGBT.

Optionally, the amplifying the pulse voltage by the second multiple and inputting the pulse voltage to the gate of the IGBT by using a second power amplifying circuit when the collector current of the IGBT is in the first stage and the third stage includes:

amplifying the voltage equivalent to the collector current and the stray inductance LS of the IGBT by using an emitter stray inductance voltage detection circuit, and inputting the amplified voltage into an auxiliary charging signal processing circuit;

performing logical negation on the amplified voltage by using the auxiliary charging signal processing circuit, performing logical AND operation on the amplified voltage and the pulse voltage, and inputting the obtained voltage to an auxiliary power amplifying circuit;

and performing second-time amplification on the pulse voltage by using the auxiliary power amplification circuit, and inputting the pulse voltage to the grid of the IGBT.

The third aspect of the present invention provides an apparatus for increasing the turn-on speed of an IGBT, the apparatus includes a processor and a memory, the memory stores a computer program, the processor is used for executing the computer program in the memory, and the computer program is used for implementing the following method when executed:

amplifying the pulse voltage by a first multiple by using a first power amplification circuit and inputting the pulse voltage to a grid electrode of the IGBT;

and amplifying the pulse voltage by a second multiple and inputting the pulse voltage to the grid of the IGBT by using a second power amplification circuit when the collector current of the IGBT is in a first stage and a third stage, wherein the first stage is an IGBT turn-on stage in which the collector current is zero, and the third stage is an IGBT turn-on stage in which the collector current is constant non-zero voltage.

Optionally, the processor is further configured to:

and when the collector current of the IGBT is in the second stage, the second power amplification circuit amplifies the zero voltage by a second multiple and inputs the zero voltage to the grid of the IGBT.

Optionally, the processor is further configured to:

when the collector current of the IGBT is in the first stage and the third stage, the second power amplifying circuit is used for amplifying the pulse voltage by a second multiple and inputting the pulse voltage to the grid of the IGBT, and the method comprises the following steps:

amplifying the voltage equivalent to the collector current and the stray inductance LS of the IGBT by using an emitter stray inductance voltage detection circuit, and inputting the amplified voltage into an auxiliary charging signal processing circuit;

performing logical negation on the amplified voltage by using the auxiliary charging signal processing circuit, performing logical AND operation on the amplified voltage and the pulse voltage, and inputting the obtained voltage to an auxiliary power amplifying circuit;

and performing second-time amplification on the pulse voltage by using the auxiliary power amplification circuit, and inputting the pulse voltage to the grid of the IGBT.

The invention provides a device for improving the turn-on speed of an IGBT, which comprises the following modules:

the first amplification module is used for amplifying the pulse voltage by a first multiple by using a first power amplification circuit and inputting the pulse voltage to a grid electrode of the IGBT;

and the second amplification module is used for amplifying the pulse voltage by a second multiple and inputting the amplified pulse voltage to the grid electrode of the IGBT when the collector current of the IGBT is in a first stage and a third stage by using a second power amplification circuit, wherein the first stage is an IGBT turn-on stage in which the collector current is zero, and the third stage is an IGBT turn-on stage in which the collector current is constant non-zero voltage.

The first amplification module is used for amplifying the pulse voltage by a first multiple by using a first power amplification circuit and inputting the pulse voltage to a grid electrode of the IGBT;

and the second amplification module is used for amplifying the pulse voltage by a second multiple and inputting the amplified pulse voltage to the grid electrode of the IGBT when the collector current of the IGBT is in a first stage and a third stage by using a second power amplification circuit, wherein the first stage is an IGBT turn-on stage in which the collector current is zero, and the third stage is an IGBT turn-on stage in which the collector current is constant non-zero voltage.

Optionally, the second amplifying module is further configured to:

and when the collector current of the IGBT is in the second stage, the second power amplification circuit amplifies the zero voltage by a second multiple and inputs the zero voltage to the grid of the IGBT.

Optionally, the second amplifying module is further configured to:

when the collector current of the IGBT is in the first stage and the third stage, the second power amplifying circuit is used for amplifying the pulse voltage by a second multiple and inputting the pulse voltage to the grid of the IGBT, and the method comprises the following steps:

amplifying the voltage equivalent to the collector current and the stray inductance LS of the IGBT by using an emitter stray inductance voltage detection circuit, and inputting the amplified voltage into an auxiliary charging signal processing circuit;

performing logical negation on the amplified voltage by using the auxiliary charging signal processing circuit, performing logical AND operation on the amplified voltage and the pulse voltage, and inputting the obtained voltage to an auxiliary power amplifying circuit;

and performing second-time amplification on the pulse voltage by using the auxiliary power amplification circuit, and inputting the pulse voltage to the grid of the IGBT.

A fifth aspect of the present invention provides a computer readable storage medium, which stores computer instructions, and the computer instructions, when executed by a processor, implement any one of the methods for increasing the turn-on speed of the IGBT provided in the second aspect of the present invention.

The method provided by the invention can realize the optimized control of the IGBT switching-on process, and reduce the switching-on time and the switching loss of the IGBT by optimizing the states of the IGBT in different periods.

Drawings

FIG. 1 is a schematic diagram of a three-phase inverter;

FIG. 2 is a schematic diagram of a driving circuit applied to an insulated gate bipolar transistor IGBT;

FIG. 3a is a diagram of a double pulse test circuit;

FIG. 3b is a schematic diagram of a double pulse test;

FIG. 4 is a circuit diagram of an emitter stray inductance voltage detection circuit;

FIG. 5a is a schematic diagram of an auxiliary charging signal processing circuit;

FIG. 5b is a circuit diagram of an auxiliary charging signal processing circuit;

FIG. 6 is a push-pull amplifier circuit diagram;

FIG. 7 is a complete IGBT drive circuit;

FIG. 8 is a graph comparing the effect of adding no/no auxiliary loop;

FIG. 9 is a flowchart of the method steps for increasing the turn-on speed of an IGBT;

FIG. 10 is a structural view of an apparatus for increasing the turn-on speed of an IGBT;

fig. 11 is a block diagram of an apparatus for increasing the turn-on speed of an IGBT.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all 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 application.

The embodiments of the application are described in further detail below with reference to the drawings of the specification. It is to be understood that the embodiments described herein are merely illustrative and explanatory of the application and are not restrictive thereof.

For convenience of understanding, terms referred to in the embodiments of the present invention are explained below:

1) stray Inductance (Stray Inductance), refers to the Inductance of a conductor in a circuit such as: equivalent inductance presented by connecting wires, element leads, an element body and the like, and stray inductance of the converter can cause higher voltage peak between a collector and an emitter of the IGBT, thereby causing larger electromagnetic interference and even causing damage to an Insulated Gate Bipolar Transistor (IGBT).

2) The Miller effect (Miller effect) is that in an inverting amplifier circuit in the field of electronics, the capacitance value equivalent to the input end of a distributed capacitance or a parasitic capacitance between an input and an output can be enlarged by 1+ K times due to the amplification effect of an amplifier, wherein K is the voltage amplification factor of the stage of the amplifier circuit, and specifically, the gate driving process of a MOSFET tube can be simply understood as the charging and discharging process of a driving source to the input capacitance (mainly, gate-source capacitance Cgs) of the MOSFET; when Cgs reaches a threshold voltage, the MOSFET enters an on state; after the MOSFET is switched on, Vds begins to fall, Id begins to rise, and the MOSFET enters a saturation region; but due to the miller effect, Vgs will not rise any longer for a while, at which time Id has reached its maximum, and Vds will continue to fall until the miller capacitance is fully charged, Vgs rises again to the value of the drive voltage, at which time the MOSFET enters the resistive region, at which time Vds falls completely, and the turn-on ends. This lengthens the loss time since the miller capacitance prevents the Vgs and hence Vds from rising.

3) The double-pulse test is used for evaluating dynamic parameters of a power device, is generally based on a half-bridge topology structure, and tests the characteristics of an IGBT and a corresponding diode under different load conditions. The method is suitable for testing the characteristics and control of devices, and has similar testing effect to that of inverters before batch production.

4) Parasitic inductance, neither capacitors nor inductors are ideal devices, and a capacitor will have some amount of series inductance (referred to as parasitic inductance). Parasitic inductance is created by conductors (particularly leads) in the capacitor.

The embodiment of the invention provides a three-phase inverter, which is used for converting direct-current electric energy (batteries and storage batteries) into alternating current, and particularly adopts a three-phase bridge type inverter circuit to invert and output direct-current bus voltage into three-phase alternating-current voltage with 380V phase voltage.

As shown in fig. 1, which is a schematic diagram of a three-phase inverter, a three-phase inverter bridge of the three-phase inverter includes 6 paths of power electronic devices, the ends of the power electronic devices are connected with a motor, direct current is changed into sine alternating current through a PWM pulse width modulation technology, the power electronic devices are used in the middle, and the on and off of the power electronic devices are controlled through the sine wave pulse width modulation to realize the output of the alternating current into the motor. General power electronic devices include MOSFETs, IGBTs, BJTs and the like, at present, the IGBTs are used as heavy-current devices, the switching frequency of the IGBTs is high, the power electronic device is an integrated device comprising the MOSFETs and the BJTs, the advantages of high input impedance of the MOSFETs and low conduction voltage drop of the BJTs are considered, and each bridge arm conducts 180 degrees, namely: in a sine period, the switching tube on each bridge arm is switched on for a half period; the upper and lower switching tubes of each bridge arm are alternately turned on, and the angle difference of the conduction of each bridge arm is 120 °, and there is a moment that three bridge arms are simultaneously turned on.

The IGBT is used as a core device, is widely applied to a photovoltaic grid-connected inverter, a wind power converter, a frequency converter and an electric energy quality control device, is a key component for realizing power electronic power conversion, and is a key factor about the performance and reliability of converter equipment, so that the optimal design of a driving circuit of the IGBT can optimize the switching performance of a power device and improve the circuit conversion efficiency.

The embodiment of the present invention provides a driving circuit applied to an insulated gate bipolar transistor IGBT, as shown in fig. 2, which is a schematic diagram of the driving circuit for driving the IGBT, and includes a pulse source circuit 201, a first power amplifying circuit 202, and a second power amplifying circuit 203, where:

the driving signal of the IGBT is generated by a pulse source circuit 201, the pulse source is divided into two paths, one of which is a main driving signal and the other is an auxiliary driving signal, the main driving signal is used for providing a pulse signal to be amplified for a first power amplifying circuit 202, the first power amplifying circuit 202 connects the amplified pulse signal to the gate of the IGBT module, and the auxiliary driving signal is used for providing an auxiliary pulse signal for increasing the turn-on speed for a second power amplifying circuit 203.

The pulse source circuit 201 is configured to provide pulse voltages to the first power amplifying circuit and the second power amplifying circuit, respectively;

specifically, in the present embodiment, a NA555 timer chip may be used to generate a pulse signal M with a duty ratio D and a frequency f, where f is 1/T.

The first power amplifying circuit 202 is configured to amplify the pulse voltage by a first multiple and input the amplified pulse voltage to a gate of the IGBT;

the first power amplifier circuit 202 includes at least one amplifier circuit for receiving the pulse voltage sent by the pulse source circuit, and the amplification factor of the amplifier circuit is related to the gate driving voltage of the IGBT, which can be freely set by a person skilled in the art according to the magnitude of the gate driving voltage.

The first power amplifying circuit 202 further includes a gate resistor Rg, and the gate resistor Rg can be adjusted to prevent a large voltage overshoot generated on the dc bus from damaging the device.

The second power amplifier circuit 203 is configured to amplify the pulse voltage by a second multiple and input the pulse voltage to the gate of the IGBT when the collector current of the IGBT is in a first stage and a third stage, where the first stage is an IGBT turn-on stage in which the collector current is zero, and the third stage is an IGBT turn-on stage in which the collector current is a constant non-zero voltage.

Specifically, when the IGBT needs to be switched on, the IGBT enters the switching-on process after the first power amplification circuit inputs the amplified pulse voltage to the grid electrode of the IGBT,the whole process is divided into 3 stages: the first stage is the turn-on delay stage, which is due to the V of IGBT_GE<Threshold voltage, so collector current i_C0; the second stage is V_GE>Threshold voltage, IGBT on, i_CBegins to increase due to the large collector current rise rate di_C/d_tThereby generating a spike current Irr; the third stage is V_GEIGBT miller voltage, collector current i_CThe IGBT is fully turned on for a constant non-zero voltage.

In the first stage and the third stage, the pulse voltage is amplified by a second multiple and then input to the gate of the IGBT, and the amplification factor of the amplification circuit is related to the gate driving voltage of the IGBT, and can be freely set by a person skilled in the art according to the magnitude of the gate driving voltage.

As an optional implementation, the driving circuit further includes:

an equivalent inductance detection circuit connected with the emitter and collector of the IGBT and used for detecting the equivalent stray inductance L of the conductor in the IGBT_S。

Because the emitter stray inductance Ls connected in series with the stray inductance is easy to measure (Ls can be measured by a double-pulse test), when the voltage drop on the measured stray inductance is close to 0 (or the voltage drop is small), the IGBT in the switching-on process can be known to be in the i state at the moment_CThe current rise phase is also i_CAnd (5) an invariant stage. And controlling the charging and discharging speed of the parasitic capacitor in the IGBT according to different stages of the IGBT in the turn-on process, realizing soft turn-on of the IGBT and shortening the turn-on time of the IGBT.

Firstly, a double-pulse test circuit is shown in fig. 3a, when the IGBT is turned on, a collector current i_CStarting to grow, while the freewheeling diode of the upper tube IGBT is in reverse recovery, this diode has no blocking capability, the upper tube Uce is 0, and at the beginning of the growth of iC, the voltage induced on the stray inductance is in the opposite direction to the bus voltage, so that the waveform measured at Vce of the lower tube now shows a notch, as shown by the dashed line in fig. 3 b. This notch voltage is generated because the stray inductance cancels a portion of the bus bar currentAnd voltage of the gap is induced voltage on the stray inductor, the induced voltage Us at the moment is obtained, and the corresponding current rise rate is obtained, so that the numerical value of the stray inductor Ls can be calculated.

Determining the actual induced voltage between a collector and an emitter of the IGBT under the condition that the IGBT receives the pulse voltage and does not turn on a load, and calculating the difference value between the actual induced voltage and the theoretical induced voltage, wherein the voltage difference value is the stray inductance L in the IGBT_SA voltage of cancellation;

obtaining collector current i when IGBT generates voltage difference value_CThe rate of rise of;

the stray inductance is calculated using the following formula: l is_S＝U_S/(di_C/d_t) Said U_SFor the difference in voltage, the di_C/d_tIs the collector current i_CThe rate of rise.

As an optional implementation, the second power amplifying circuit includes: emitter stray inductance voltage detection circuitry, supplementary signal processing circuit and the auxiliary power amplifier circuit of charging, wherein:

FIG. 4 shows a circuit diagram of an emitter stray inductance voltage detection circuit for comparing the collector current with the stray inductance L of the IGBT_SEquivalent voltage amplification, wherein the amplified voltage is input to an auxiliary charging signal processing circuit;

grounding an emitter of the IGBT, wherein the input end of the emitter stray inductance voltage detection module is a power supply cathode and a ground potential so as to obtain the voltage between the power supply cathode and the ground potential;

when the IGBT is in the first and third stages in the turn-on process, i_CIs substantially constant, the magnitude of the voltage between the negative pole of the power supply and the ground potential, and the stray inductance and collector current i_CThe rising rate is related, in the first and third stages, the voltage between the negative electrode of the power supply and the ground potential is 0, the voltage input to the auxiliary charging signal processing circuit is also 0, in the second stage, i_CIs in a state of being changed, the voltage inputted to the auxiliary charging signal processing circuit is equal to L_S*di_C/d_t；

In this embodiment, an LM3504 chip is used as the amplification driving chip, U_iWith terminal as input for the voltage between the negative pole of the power supply and ground potential, U_oThe end is used as an output end and is output to the auxiliary charging signal processing circuit, and the amplification factor is adjusted by adjusting the size of a resistor in the driving amplification circuit;

in this embodiment, the voltage input to the emitter stray inductor voltage detection module is about 0.5V, the voltage output to the auxiliary charging signal processing module is about 5V, and the amplification factor is 10 times.

As an optional implementation manner, the amplification factor of the emitter stray inductance voltage detection circuit to the equivalent voltage is a factor corresponding to the amplification factor of the equivalent voltage to the threshold voltage;

as shown in fig. 5a, the schematic diagram of an auxiliary charging signal processing circuit is shown, where the auxiliary charging signal processing circuit is configured to perform a logical and operation on the amplified voltage and the pulse voltage after performing a logical not operation, and input the obtained voltage to the auxiliary power amplifying circuit;

the auxiliary charging signal processing circuit includes:

a logic not gate 501, configured to output an input voltage that does not exceed a threshold voltage of the logic not gate as a pulse voltage, and output an input voltage that exceeds the threshold voltage of the logic not gate as a zero voltage;

and a logic and gate 502, configured to convert an output of the logic not gate and the pulse voltage into a logic signal through a threshold voltage, perform an and operation, and input the pulse voltage to the auxiliary power amplifying circuit when the obtained logic signal is 1.

As shown in fig. 5b, in this embodiment, a 74LS04 chip is used as a logic not gate to receive the voltage sent by the emitter stray inductor voltage detection module, and when an input voltage that does not exceed the threshold voltage of the logic not gate is output as a pulse voltage, otherwise, an input voltage that exceeds the threshold voltage of the logic not gate is output as a zero voltage.

The auxiliary power amplifying circuit is used for carrying out second-time amplification on the pulse voltage and inputting the pulse voltage to a grid electrode of the IGBT;

as shown in fig. 6, in the present embodiment, the pulse voltage is subjected to second-order amplification using a push-pull amplification circuit and input to the gate of the IGBT.

As an optional implementation manner, the driving circuit further includes a current-blocking diode, where:

the input end of the choke diode is connected with the auxiliary power amplifying circuit, and the output end of the choke diode is connected with the grid of the IGBT.

As shown in fig. 7, the driving circuit for a complete IGBT includes: a pulse source circuit 701, a first power amplifier circuit 702, an emitter stray inductance voltage detection circuit 703, an auxiliary charging signal processing circuit 704, an auxiliary power amplifier circuit 705, and a choke diode 706;

the pulse source circuit 701 is divided into two paths of signals, one of which is a main driving signal and the other of which is an auxiliary driving signal, the main driving circuit is used for providing a pulse signal to be amplified for the first power amplifying circuit 702, and the output end of the first power amplifying circuit 702 is connected to the gate of the IGBT through a gate resistor Rg.

The other auxiliary driving signal is used for being input into the auxiliary charging signal processing circuit 704, the auxiliary charging signal processing circuit 704 receives the voltage detected by the emitter stray inductance voltage detection circuit 703 for logic operation, and the voltage is input into the auxiliary power amplification module 705 and is connected to the gate of the IGBT through a blocking diode 706.

In the embodiment, the 600V/600A IGBT module MBB600TV6A of Hitachi is used for example, and the emitter inductance L is firstly measured by a double-pulse test_sCollector current i when the IGBT is on_CStarts to grow, and the freewheeling diode of the upper tube IGBT is in reverse recovery at this time, the diode has no blocking capability, the upper tube Uce is 0, and at i_CWhen the voltage starts to increase, the direction of the voltage induced on the stray inductor is opposite to the bus voltage, so that a notch appears in the waveform measured on the Vce of the lower tube, the notch is the induced voltage on the stray inductor, the induced voltage is obtained through experiments, the induced voltage is △ U-201V, the current rise rate is di/dt-4156A/us, and the voltage is applied to the lower tube in a continuous modeThe stray inductance L is obtained through the over calculation_s48.3 nH. By calculating the voltage amplification factor of the emitter stray inductance voltage detection circuit, the IGBT on waveform is shown in fig. 8, where the thick line indicates the result without the auxiliary loop and the thin line indicates the result with the auxiliary loop, since the bus voltage is 380V. t is t_dRepresents a slave U_GEBegins to rise to i_CBeginning of increasing time interval, t_rRepresents i_CFrom the time interval of 10% of the maximum value rising to 90%, the comparison of the influence of the auxiliary driving circuit on the IGBT turn-on speed shows that when the auxiliary circuit is not added, the delay time t is_d1767ns, rise time t_r1442ns, the total on-time is 1.209 μ s. After adding the auxiliary loop, delaying time t_d2400ns, rise time t_r2The total on-time is 0.702 mus for 260ns, which is a significant improvement with the addition of the auxiliary loop.

An embodiment of the present invention provides a method for increasing an IGBT turn-on speed, as shown in fig. 9, the method includes:

step S901, amplifying the pulse voltage by a first multiple by using a first power amplifying circuit, and inputting the amplified pulse voltage to a gate of an IGBT;

step S902, amplifying the pulse voltage by a second multiple and inputting the amplified pulse voltage to a gate of the IGBT by using a second power amplifier circuit when a collector current of the IGBT is in a first stage and a third stage, where the first stage is an IGBT turn-on stage where the collector current is zero, and the third stage is an IGBT turn-on stage where the collector current is a constant non-zero voltage.

Optionally, the method further comprises:

and when the collector current of the IGBT is in the second stage, the second power amplification circuit amplifies the zero voltage by a second multiple and inputs the zero voltage to the grid of the IGBT.

Optionally, the amplifying the pulse voltage by the second multiple and inputting the pulse voltage to the gate of the IGBT by using a second power amplifying circuit when the collector current of the IGBT is in the first stage and the third stage includes:

amplifying the voltage equivalent to the collector current and the stray inductance LS of the IGBT by using an emitter stray inductance voltage detection circuit, and inputting the amplified voltage into an auxiliary charging signal processing circuit;

performing logical negation on the amplified voltage by using the auxiliary charging signal processing circuit, performing logical AND operation on the amplified voltage and the pulse voltage, and inputting the obtained voltage to an auxiliary power amplifying circuit;

and performing second-time amplification on the pulse voltage by using the auxiliary power amplification circuit, and inputting the pulse voltage to the grid of the IGBT.

The embodiment of the invention provides a device for improving the turn-on speed of an IGBT, as shown in FIG. 10;

the apparatus 1000 may have a relatively large difference due to different configurations or performances, and may include one or more processors (CPU) 1001 (e.g., one or more processors) and a memory 1002, one or more storage media 1003 (e.g., one or more mass storage devices) storing applications 1004 or data 1006. Wherein the memory 1002 and the storage medium 1003 may be transient storage or persistent storage. The program stored in the storage medium 1003 may include one or more modules (not shown), and each module may include a series of instruction operations in the information processing apparatus. Further, the processor 1001 may be configured to communicate with the storage medium 1003, and execute a series of instruction operations in the storage medium 1003 on the apparatus 1000.

The apparatus 1000 may also include one or more power supplies 1009, one or more wired or wireless network interfaces 1007, one or more input-output interfaces 1008, and/or one or more operating systems 1005 such as Windows Server, Mac OS X, Unix, Linux, FreeBSD, etc.

The processor is configured to execute a computer program in the memory, the computer program when executed implementing the method of:

amplifying the pulse voltage by a first multiple by using a first power amplification circuit and inputting the pulse voltage to a grid electrode of the IGBT;

and amplifying the pulse voltage by a second multiple and inputting the pulse voltage to the grid of the IGBT by using a second power amplification circuit when the collector current of the IGBT is in a first stage and a third stage, wherein the first stage is an IGBT turn-on stage in which the collector current is zero, and the third stage is an IGBT turn-on stage in which the collector current is constant non-zero voltage.

Optionally, the processor is further configured to:

and when the collector current of the IGBT is in the second stage, the second power amplification circuit amplifies the zero voltage by a second multiple and inputs the zero voltage to the grid of the IGBT.

Optionally, the processor is further configured to:

when the collector current of the IGBT is in the first stage and the third stage, the second power amplifying circuit is used for amplifying the pulse voltage by a second multiple and inputting the pulse voltage to the grid of the IGBT, and the method comprises the following steps:

amplifying the voltage equivalent to the collector current and the stray inductance LS of the IGBT by using an emitter stray inductance voltage detection circuit, and inputting the amplified voltage into an auxiliary charging signal processing circuit;

performing logical negation on the amplified voltage by using the auxiliary charging signal processing circuit, performing logical AND operation on the amplified voltage and the pulse voltage, and inputting the obtained voltage to an auxiliary power amplifying circuit;

and performing second-time amplification on the pulse voltage by using the auxiliary power amplification circuit, and inputting the pulse voltage to the grid of the IGBT.

The embodiment of the invention provides a device for improving the turn-on speed of an IGBT, which comprises the following modules:

the first amplification module 1101 is configured to amplify the pulse voltage by a first multiple by using a first power amplification circuit, and then input the amplified pulse voltage to a gate of the IGBT;

the second amplifying module 1102 is configured to amplify, by using a second power amplifying circuit, the pulse voltage by a second multiple and input the amplified pulse voltage to the gate of the IGBT when the collector current of the IGBT is in a first stage and a third stage, where the first stage is an IGBT turn-on stage in which the collector current is zero, and the third stage is an IGBT turn-on stage in which the collector current is a constant non-zero voltage.

Optionally, the second amplifying module 1102 is further configured to:

and when the collector current of the IGBT is in the second stage, the second power amplification circuit amplifies the zero voltage by a second multiple and inputs the zero voltage to the grid of the IGBT.

Optionally, the second amplifying module 1102 is further configured to:

when the collector current of the IGBT is in the first stage and the third stage, the second power amplifying circuit is used for amplifying the pulse voltage by a second multiple and inputting the pulse voltage to the grid of the IGBT, and the method comprises the following steps:

amplifying the voltage equivalent to the collector current and the stray inductance LS of the IGBT by using an emitter stray inductance voltage detection circuit, and inputting the amplified voltage into an auxiliary charging signal processing circuit;

performing logical negation on the amplified voltage by using the auxiliary charging signal processing circuit, performing logical AND operation on the amplified voltage and the pulse voltage, and inputting the obtained voltage to an auxiliary power amplifying circuit;

and performing second-time amplification on the pulse voltage by using the auxiliary power amplification circuit, and inputting the pulse voltage to the grid of the IGBT.

The embodiment of the invention provides a computer-readable storage medium, wherein computer instructions are stored in the computer-readable storage medium, and when the computer instructions are executed by a processor, the method for improving the turn-on speed of the IGBT provided by any one of the above embodiments is realized.

As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.

The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.