CN215871167U

CN215871167U - IGBT drive control isolation and power isolation circuit

Info

Publication number: CN215871167U
Application number: CN202121491866.9U
Authority: CN
Inventors: 吕正文; 李娜; 曹双喜
Original assignee: Jiangsu Ocpt Institute Co ltd
Current assignee: Jiangsu Ocpt Institute Co ltd
Priority date: 2021-07-01
Filing date: 2021-07-01
Publication date: 2022-02-18
Anticipated expiration: 2031-07-01

Abstract

The utility model relates to the technical field of IGBT drive, in particular to an IGBT drive control isolation and power isolation circuit, which comprises: a first power isolation circuit electrically connected to the first control isolation circuit, the first control isolation circuit comprising a fiber optic transmitter (Z1) and a fiber optic receiver (Z2) electrically connected to the digital isolator (U1); a sixth pin of the digital isolator (U1) is connected with a base electrode of a triode (Q1), and the triode (Q1) is respectively connected with the optical fiber transmitter (Z1) and the resistor (R1); the seventh pin of the digital isolator (U1) is connected with the optical fiber receiver (Z2) and the noninductive capacitor (CD 1). The utility model has the beneficial effects that: the safety level is improved, and the safety isolation of a weak current control loop and a strong current load loop is ensured when major faults occur; the circuit power supply is respectively supplied by SPR01N-05 and DPBW06F-15 chips, so that the effects of each potential requirement, level conversion, driving power supply and safety isolation protection are achieved.

Description

IGBT drive control isolation and power isolation circuit

Technical Field

The utility model relates to the field of IGBT driving, in particular to an IGBT driving control isolation and power isolation circuit.

Background

In modern industrial systems, power electronic converters are widely applied to the fields of traction locomotives, direct-current transmission systems, industrial automation, aviation systems, electric automobiles, new energy power generation and the like. Semiconductor switching devices such as IGBT are core devices forming the power electronic converter, and especially the IGBT occupies a leading position in the application of higher power.

The IGBT is developed into a main switching device of a high-power electronic converter due to its advantages of high switching frequency, stable operation, and the like.

The power device IGBT is a core component of a traction transmission system, effective state monitoring and service life evaluation on the power device IGBT are of great significance for reliable operation of the traction transmission system, in a high-speed train system, a traction converter is a core power part of a train, and main devices of the IGBT forming the traction converter are influenced by train operation conditions and severe operation environments, are easy to age and lose efficacy and cause train operation faults.

The IGBT driving circuit is used as an important component of the power electronic device, the main function of the IGBT driving circuit is to carry out isolated transmission and power amplification on a control signal, the working state of the high-voltage high-power IGBT module directly influences the whole machine performance of the power electronic device, and the driving circuit directly determines whether the high-voltage IGBT module can work safely or not.

The main problems in the existing IGBT driving circuit are as follows:

1. the voltage of the MCU is generally 3V3, while the voltage of the fiber transceiver is 5V, and the level has the mismatch problem;

2. EMC problems such as PWM data loss, misoperation and the like can occur in the process of single-electrical-signal-driven isolation control in the existing design;

3. the existing design lacks the safety isolation measure of a weak current control loop and a strong current load loop.

SUMMERY OF THE UTILITY MODEL

In order to overcome the problems in the prior art, the disclosed embodiment of the utility model provides an IGBT drive control isolation and power isolation circuit. The technical scheme is as follows: the optical fiber isolator comprises a first power isolation circuit electrically connected with a first control isolation circuit, wherein the first control isolation circuit comprises an optical fiber transmitter Z1 and an optical fiber receiver Z2 which are electrically connected with a digital isolator U1; a sixth pin of the digital isolator U1 is connected with a base electrode of a triode Q1, a collector electrode and an emitter electrode of the triode Q1 are respectively connected with a first pin and a second pin of the optical fiber transmitter Z1, and the emitter electrode of the triode Q1 is connected with a resistor R1 in series and then connected with 5V voltage;

the seventh pin of the digital isolator U1 is connected with the fourth pin of the optical fiber receiver Z2, and the third pin of the optical fiber receiver Z2 is connected with the voltage of the non-inductive capacitor CD1 and 5V respectively.

The first power isolation circuit comprises a power isolation chip U3, a non-inductive capacitor CD4, a capacitor C2, a non-inductive capacitor CD5 and a capacitor C3, and a 24V power supply is connected after a first input pin and a second input pin of the power isolation chip U3 are connected with a capacitor C2 and the non-inductive capacitor CD4 in parallel; the fourth and sixth output pins of the power isolation chip U3 are connected in parallel with the non-inductive capacitor CD5 and the capacitor C3 to output 5V voltage;

further, the device also comprises a second control isolation circuit and a second power isolation circuit which are electrically connected with the first power isolation circuit, wherein the second control isolation circuit comprises an optical fiber transmitter Z3 and an optical fiber receiver Z4 which are electrically connected with a digital isolator U4; a sixth pin of the digital isolator U4 is connected with a base electrode of a triode Q2, and a collector electrode and an emitter electrode of the triode Q2 are respectively connected with a first pin and a second pin of the optical fiber transmitter Z3; an emitter of the triode Q2 is connected with a resistor R2 in series and then is connected with 5V voltage;

the seventh pin of the digital isolator U4 is connected with the fourth pin of the optical fiber receiver Z4, and the third pin of the optical fiber receiver Z4 is connected with the voltage of the non-inductive capacitor CD6 and 5V respectively.

Furthermore, the second power isolation circuit comprises a power isolation chip U2, a capacitor C1, a non-inductive capacitor CD2 and a non-inductive capacitor CD3, wherein a first pin and a second pin of the power isolation chip U2 are respectively connected with a capacitor C1 and a non-inductive capacitor CD2 in parallel and then are connected with a 24V power supply; the sixth pin and the seventh pin of the power isolation chip U2 are connected with the non-inductive capacitor CD3 in parallel and then output 15V voltage.

The second power isolation circuit outputs 15V voltage to provide voltage for the lower driver board, and the lower driver board is connected with the optical fiber receiver Z1, the optical fiber receiver Z3, the optical fiber receiver Z2 and the optical fiber receiver Z4 through optical fiber transmission lines.

The first pin and the fourth pin of the optical fiber receiver Z2 and the optical fiber receiver Z4 are short-circuited, and the second pin, the fifth pin and the eighth pin are grounded; the second pins of the optical fiber transmitter Z1 and the optical fiber transmitter Z3 are grounded.

Digital isolator U1 and digital isolator U4 have the fourth and fifth pins grounded.

Further, digital isolator U1 and digital isolator U4 are of type ADUM 1201.

Furthermore, the power isolation chip U3 is SPR 01N-05.

Further, the power isolation chip U2 is DPBW 06F-15.

The utility model has the beneficial effects that:

1. the safety level of the driving control circuit is improved, and the safety isolation of a weak current control circuit and a strong current load circuit is ensured under the condition of major faults.

2. The controller interacts with the lower-level driving board according to a set protocol; the power supply of circuits required by interaction and action is respectively supplied by two isolated power chips of SPR01N-05 and DPBW06F-15, and the circuits can also provide required stable voltage for a digital isolator, an optical fiber transceiver, a triode and the like, meet the requirements of each potential, convert the level, drive the power supply and realize safe isolation protection.

Drawings

FIG. 1 is a diagram of an IGBT drive control isolation circuit of the present invention;

fig. 2 is a diagram of an IGBT power isolation circuit of the utility model.

Detailed Description

The present invention will now be described in further detail with reference to the accompanying drawings.

Referring to fig. 1, a first pin and an eighth pin of two ADUM1201 digital isolators in a control isolation circuit are respectively connected with 3V3 and 5V power supply voltages, the two pins need to be powered on simultaneously to ensure that two channels of the ADUM1201 can work normally, and if one of the two pins is not powered on, the whole chip cannot work normally; the 6 th pins of the two ADUM1201 are respectively connected with the triodes Q1 and Q2, the driving signals are amplified through the two triodes, the triodes Q1 and Q2 are respectively connected with the two HFBR-1528 optical fiber transmitters, and the 7 th pins of the two ADUM1201 are respectively connected with the fourth pins of the two HFBR-2528 optical fiber receivers.

As shown in fig. 2, the two power isolation circuits are SPR01N-05 and DPBW06F-15 respectively, the input terminals of SPR01N-05 are respectively connected in parallel with a capacitor C2 and a non-inductive capacitor CD4 and then connected with a 24V external power supply, and the output terminals of SPR01N-05 are respectively connected in parallel with a non-inductive capacitor CD5 and a capacitor C3 and then output 5V power supply voltage; the input end of the DPBW06F-15 is respectively connected with a capacitor C1 and a non-inductive capacitor CD2 in parallel and then is connected with a 24V external power supply, and the output end of the DPBW06F-15 is connected with a non-inductive capacitor CD3 in parallel and then outputs 15V power supply voltage.

The working principle of the utility model is as follows:

after the MCU drives and controls the PWM signal to pass through the second pins of the two ADUM1201 chips, the PWM signal acts on two fiber transmitters HFBR-1528 through a driving triode BCX71H after level conversion and digital isolation, the control signal is converted into an optical signal after secondary isolation, and the optical signal is conducted to a lower-level driving board through a single mode fiber and used for controlling an IGBT switch to achieve a load switching function; meanwhile, the state of the IGBT is fed back to the two optical fiber receivers HFBR-2528 through the optical fibers by the lower-level driving board, and is also subjected to secondary isolation conversion and then is fed to the MCU through the third pins of the two ADUM1201 chips; the MCU and the lower driver board interact through a GPIO protocol (namely pulse width and potential identification), voltages required by interaction and IGBT switching are respectively generated by SPR01N-05 and DPBW06F-15 isolation power supply chips, and the two isolation power supply chips can also provide required stable voltages for a digital isolator, an optical fiber transceiving chip, a triode and the like, so that the requirements of each potential, level conversion, driving energy supply and safe isolation protection are met.

The circuit solves the problem that the 3V3 voltage of the MCU is not matched with the 5V voltage of the optical fiber transceiver, and the primary triode drive is added, so that the drive capability is increased, and the defect of insufficient GPIO drive capability of the MCU is overcome; and photoelectric isolation is realized through the optical fiber receivers Z2 and Z4 and the optical fiber transmitters Z1 and Z3, power supply isolation is realized through the digital isolators U1 and U4, EMC problems such as PWM data loss and misoperation in the original single-electric-signal driving control process are solved through two times of isolation, the overall safety level is improved, and the safety isolation of a weak-current control loop and a strong-current load loop is ensured under the condition of major faults.

In light of the foregoing description of the preferred embodiment of the present invention, many modifications and variations can be made by the worker in the light of the above teachings without departing from the spirit of the utility model. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.

Claims

1. The utility model provides a IGBT drive control keeps apart and power isolation circuit which characterized in that: the device comprises a first power isolation circuit electrically connected with a first control isolation circuit, wherein the first control isolation circuit comprises a fiber optic transmitter Z1 and a fiber optic receiver Z2 which are electrically connected with a digital isolator U1; a sixth pin of the digital isolator U1 is connected with a base electrode of a triode Q1, and the triode Q1 is respectively connected with the optical fiber transmitter Z1 and a resistor R1; a seventh pin of the digital isolator U1 is connected with the optical fiber receiver Z2 and the noninductive capacitor CD 1;

the first power isolation circuit comprises a power isolation chip U3, a non-inductive capacitor CD4, a capacitor C2, a non-inductive capacitor CD5 and a capacitor C3, wherein the input end of the power isolation chip U3 is connected with a voltage input end after being respectively connected with the capacitor C2 and the non-inductive capacitor CD4 in parallel; the output end of the power isolation chip U3 is connected in parallel with the non-inductive capacitor CD5 and the capacitor C3, and then outputs voltage for the first control isolation circuit.

2. The IGBT drive control isolation and power isolation circuit of claim 1, wherein: the first power isolation circuit is also connected with a second control isolation circuit and a second power isolation circuit, and the second control isolation circuit comprises an optical fiber transmitter Z3 and an optical fiber receiver Z4 which are electrically connected with a digital isolator U4; a sixth pin of the digital isolator U4 is connected with a base electrode of a triode Q2, and a collector electrode and an emitter electrode of the triode Q2 are respectively connected with the optical fiber transmitter Z3 and the resistor R2;

and a seventh pin of the digital isolator U4 is connected with the optical fiber receiver Z4 and the noninductive capacitor CD 6.

3. The IGBT drive control isolation and power isolation circuit of claim 2, wherein: the second power isolation circuit comprises a power isolation chip U2, a capacitor C1, a non-inductive capacitor CD2 and a non-inductive capacitor CD3, wherein the input end of the power isolation chip U2 is respectively connected with the capacitor C1 and the non-inductive capacitor CD2 in parallel and then connected with a voltage input end; the output end of the power isolation chip U2 is connected with the non-inductive capacitor CD3 in parallel and then outputs voltage.

4. The IGBT drive control isolation and power isolation circuit of claim 2, wherein: the digital isolator U1 and the digital isolator U4 are of type ADUM 1201.

5. The IGBT drive control isolation and power isolation circuit of claim 1, wherein: the power isolation chip is U3 model SPR 01N-05.

6. The IGBT drive control isolation and power isolation circuit of claim 3, wherein: the power isolation chip is U2 model DPBW 06F-15.