Pulse interface circuit for IPM

Abstract

The invention discloses an interface circuit for driving pulse in an IGBT intelligent power module (IPM). The interface circuit comprises a PWM signal access end, a triode Q1, a base resistor R1 of the triode Q1, a pulse transformer T1, a reverse serially connected diode D1, and an output side rectifier diode D2. The pulse transformer has three windings; the dotted terminal of a primary winding of the pulse transformer T1 is connected to a 5V power supply, while the other end is connected in series with the triode Q1; an emitter of the triode Q1 is connected to the ground (the same as that of the 5V power supply) of an input signal; the dotted terminal of a bucking winding of the pulse transformer T1 is connected in series with the reverse diode D1, while the other end is connected with the dotted terminal of the primary winding; the dotted terminal of an output winding of the pulse transformer T1 is connected in series with the rectifier diode D2, while the other end of the output winding is a negative end of an output signal; and the other end of the diode D2 is a positive end of the output signal.

Description

technical field [0001] The invention relates to an interface circuit for driving pulses in an IGBT intelligent power module (IPM), belonging to the field of power electronics. Background technique [0002] With the development of power electronics technology, the application of IGBT Intelligent Power Module (IPM) is becoming more and more extensive. It affects the power supply of the system, thereby causing interference to the control signal. The existing pulse interface circuits used in the IPM interface circuit are all based on optical coupling. The output signal of the optocoupler is due to the voltage drop of the internal transistor of the optocoupler. Make the low level of the output PWM signal non-zero. In the application of IPM, because the IPM input high level is 2V, and the low level is 1.5, it is easy to receive interference, causing IGBT to be turned off and turned on by mistake. In practical applications, it will cause distortion of the output waveform of the po...

AI Technical Summary

Problems solved by technology

[0002] With the development of power electronics technology, the application of IGBT Intelligent Power Module (IPM) is becoming more and more extensive. It affects the power supply of the system, thereby causing interference to the control signal. The existing pulse interface circuits used in the IPM interface circuit are all based on optical coupling. The output signal of the optocoupler is due to the voltage drop of the internal transistor of the optocoupler. Make the low level of the output PWM signal non-zero. In the application of IPM, because the IPM input high level is 2V, and the low level is 1.5, it is easy to receive interference, causing IGBT to be turned off and turned on by mistake. In practical applications, it will cause distortion of the output waveform of the power electronic device, and in severe cases, it will cause damage to the IGBT, and even cause the system to collapse.

In addition, the pulse interface circuit using the optocoupler isolation scheme will cause a large transmission delay of the PWM signal, reducing the control accuracy of the system

Images