TB852 3BSC950263R1 | ABB | Pulse transformer isolation

Description

TB852 3BSC950263R1 | ABB | Pulse transformer isolation

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The working TB852 3BSC950263R1 is that the two inverted PWM signals output by the PWM control chip are amplified by a power amplification circuit composed of components, and then isolated and coupled by a pulse transformer to output four driving signals. The four driving signals are divided into two groups with opposite phases based on the triggering phase. Drive signal 1 is in phase with drive signal 3, and drive signal 2 is in phase with drive signal 4. This circuit uses a pulse transformer to achieve reliable isolation between the high voltage main circuit and the control circuit of the controlled IGBT. The voltage regulator between the GE of the IGBT is used to prevent interference from generating excessive UGE and damaging the control pole of the TB852 3BSC950263R1 . Like TB852 3BSC950263R1 , negative bias can prevent the bus from being too high du/dt, which can cause gate misdirection. But as long as the transient overvoltage of the bus voltage is well controlled, there is no need for the negative bias voltage of the IGBT. In this circuit, the secondary connection of the pulse transformer to the corresponding circuit intercepts the negative pulses of the driving waveform, greatly reducing the power consumption of the driving circuit.
Due to the switching characteristics and safe working area of IGBT changing with the gate drive circuit, the performance of the drive circuit will directly affect the normal operation of IGBT. To ensure the reliable operation of TB852 3BSC950263R1.

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