Driving circuit of IGBT (Insulated Gate Bipolar Translator)

Abstract

The invention discloses a driving circuit of an IGBT (Insulated Gate Bipolar Translator). The driving circuit comprises a driving power circuit, an optical fiber signal receiving-transmitting module, a high-speed comparator, a driving chip and a current amplification circuit. An external control signal is converted into an optical signal to be transmitted to the driving circuit, the optical fiber signal receiving-transmitting module converts the optical signal into an electrical signal, a fast signal is formed through the high-speed comparator to be provided for the rear-end driving chip, and a driving signal output by the driving chip is amplified through the current amplification circuit to be output to an external IGBT. The insulating strength of the driving circuit is large, and the driving circuit can drive the 1700V, 1600A high-voltage of IGBT to work. The components of the driving circuit adopt high-speed components, the delay between driving signal output and signal input is smaller, the delay jitter is smaller, and the driving circuit is particularly suitable for occasions with higher requirements on a timing sequence. The components adopted by the driving circuit are mature products on the market, the cost is lower, and the reliability is higher.

Description

technical field [0001] The invention relates to a high-voltage IGBT driving circuit. Background technique [0002] IGBT combines the advantages of MOSFET and GTR. It has the characteristics of high input impedance, fast switching speed, good thermal stability, low on-state voltage, high withstand voltage, and large current. It has been widely used in various fields in recent years. IGBT is a voltage-controlled device. A DC voltage of more than ten volts is applied between its gate-emitter, and only microampere-level current flows, basically consuming no power. However, there is a large parasitic capacitance between the gate-emitter of the IGBT. When the IGBT is turned on and off, the driving circuit needs to provide a charging and discharging current of several amperes to meet the rising and falling edges of the driving pulse. The driving circuit is very important for the normal operation of the IGBT. Generally speaking, the IGBT drive circuit should have the following...

AI Technical Summary

Problems solved by technology

However, there is a large parasitic capacitance between the gate-emitter of the IGBT. When the IGBT is turned on and off, the drive circuit needs to provide a charging and discharging current of several amperes to meet the rising and falling edges of the driving pulse.

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