IGBT (Insulated Gate Bipolar Translator) short circuit protection detection circuit based on driving chip

Abstract

The invention discloses an IGBT (Insulated Gate Bipolar Translator) short circuit protection detection circuit based on a driving chip. The detection circuit comprises an isolated driving circuit, wherein the isolated driving circuit comprises an isolated driving chip and a second resistor; the output pin of the isolated driving chip is connected with one end of the second resistor; the other endof the second resistor is connected with the base of an IGBT to be detected; the isolated driving chip further comprises an input pin and an overcurrent detection pin DESAT; the input pin is connected with a PWM (Pulse-Width Modulation) driving signal of a host; the overcurrent detection circuit comprises a first resistor, a first voltage regulator tube and a first diode; the overcurrent detection pin DESAT is connected with one end of the first resistor and the cathode of the first voltage regulator tube respectively; the other end of the first resistor is connected with a positive power supply; the anode of the first voltage regulator tube is connected with the cathode of the first diode; and the anode of the first diode is connected with the collector of an IGBT to be detected. The detection circuit has high IGBT short circuit protection reliability, a simple structure and high portability.

Description

technical field [0001] The invention relates to an IGBT short-circuit protection circuit. Background technique [0002] At present, high-power IGBTs are widely used in high-power frequency conversion devices, but it has been difficult to find a reliable method for IGBT short-circuit protection. For IGBT short-circuit protection detection, the main method is to detect the IGBT on-state collector-emitter voltage Vce, and judge Whether its voltage is greater than the voltage value corresponding to the voltage short-circuit current. At present, in the aspect of short-circuit protection detection, driver chips with short-circuit protection are mainly used, such as HCPL-316J, PC929, FOD8316 and other isolated driver chips with short-circuit protection. Provide 250uA detection current, and through its Vce detection circuit (see figure 1 ) mainly consists of series resistors, forward ultrafast recovery diodes or several series connected ultrafast recovery diodes. [0003] The cir...

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Problems solved by technology

[0008] In order to overcome the problems of complex circuit, low reliability, poor portability and difficult circuit adjustment of the existing IGBT drive chip short circuit protection circuit, the present invention provides a simple circuit, high reliability, good portability and high stability IGBT short-circuit protection detection circuit based on driver chip

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