High-performance anti-interference drive circuit suitable for IGBT and MOS

Abstract

The invention discloses a high-performance anti-interference drive circuit suitable for an IGBT and an MOS. The high-performance anti-interference drive circuit suitable for the IGBT and the MOS comprises an optocoupler (OC) and a not-gate circuit (NOT1), wherein the input end of the not-gate circuit (NOT1) is connected to an IO port or a PWM port of a DSP. An anode of an LED inside the optocoupler (OC) is connected to a first power source (VCC1), a cathode of the LED inside the optocoupler (OC) is connected to the output end of the not-gate circuit (NOT1) through a first current-limiting resistor (R3), the output end of the not-gate circuit (NOT1) is further provided with a pull-up resistor (R2), the pull-up resistor (R2) is connected with a second power source (VCC2), and the signal output end of the optocoupler (OC) is connected to the controlled IGBT or the controlled MOS. The high-performance anti-interference drive circuit suitable for the IGBT and the MOS can play a role of efficient EMI resistance, so that the purpose of preventing the MOS or the IGBT from being switched on and switched off accidentally can be achieved, in addition, the circuit structure is simple, the cost is low, and the needed size is small.

Description

technical field [0001] The invention relates to an anti-jamming circuit, in particular to a high-performance anti-jamming driving circuit suitable for IGBT and MOS used in photovoltaic inverters. Background technique [0002] A photovoltaic inverter usually includes a drive circuit for controlling the turn-on and turn-off of MOS or IGBT. However, during the working process of the general drive circuit, it is required to accurately control the on and off of the MOS or IGBT according to the PWM signal sent by the DSP, so as to realize the functions required by the photovoltaic inverter; but due to the high and low frequency signals inside the inverter In the case of overlapping or unreasonable layout, some other signals will interfere with the PWM signal sent by the DSP, resulting in the inability to correctly control the turn-on and turn-off of the MOS or IGBT, resulting in damage to the MOS or IGBT. However, although some existing anti-jamming driving circuits can achieve t...

AI Technical Summary

Problems solved by technology

However, during the working process of the general drive circuit, it is required to accurately control the on and off of the MOS or IGBT according to the PWM signal sent by the DSP, so as to realize the functions required by the photovoltaic inverter; but due to the high and low frequency signals inside the inverter In the case of overlapping or unreasonable layout, some other signals will interfere with the PWM signal sent by the DSP, resulting in the inability to correctly control the turn-on and turn-off of the MOS or IGBT, resulting in damage to the MOS or IGBT

However, although some existing anti-interference drive circuits can achieve anti-interference effect, the circuit structure is complex, the cost of components used is high, and the required PCB volume is relatively large.

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