Driving circuit with short-circuit protection function suitable for high-voltage solid-state power controller

Abstract

The invention discloses a driving circuit with a short-circuit protection function suitable for a high-voltage solid-state power controller, the driving circuit comprises an after-connection short-circuit protection module and an after-short-circuit connection protection module, the after-connection short-circuit protection module comprises a driving chip W2, a capacitor C16, a capacitor C24 and a resistor GR1; the after-short-circuit connection module comprises a driving chip W1 and a resistor GR2. According to the invention, the logic signal of the input end of the driving chip is controlled, the voltage change of the output end of the driving chip is controlled, and a capacitor, resistor and diode combined circuit connected with the driving chip is matched, so that the control of the SiC MOSFET grid charge discharging process is realized, and the short-circuit protection functions of short circuit after connection and connection after short circuit are realized. According to the invention, the short-circuit protection function design of the high-voltage solid-state power controller is realized at low cost, and the method has great significance for the production of high-reliability and high-integration solid-state power controller products.

Description

technical field [0001] The invention belongs to the technical field of integrated circuits and relates to a drive circuit suitable for a 270V high-voltage solid-state power controller with a short-circuit protection function. Background technique [0002] One of the most important features of solid-state power controllers is short-circuit protection, and the short-circuit of 270V high-voltage solid-state power controllers is the focus and difficulty of research. The general literature only gives general or theoretical solutions, but none of them is definite. effective solution. Compared with low-voltage and AC, the difficulty of high-voltage short-circuit protection is that there is a short response time and large overshoot voltage during high-voltage short-circuit. Because the voltage is high, the relative di / dt during short-circuit is very large. At 270V, it is basically It has reached more than 30A / us, or even greater. If the design of the short-circuit protection circu...

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Problems solved by technology

If the design of the short-circuit protection circuit is unreasonable, a large peak voltage or excessive transient current will be generated, which will eventually cause damage to the output power device SiC MOSFET

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