Drive circuit
AssigneeMitsubishi Electric Corporation
InventorsYu Seikoba, Shohei Sano, Yo Habu
Life of this patent
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Abstract
A gate driver IC includes a plurality of switching elements that drives an IGBT; a comparator that outputs an alarm signal in a case where a potential of a shunt resistor connected between an emitter terminal of the IGBT and a ground is equal to or higher than a Vth1; a delay circuit that outputs a trigger signal after the comparator starts outputting the alarm signal; and a controller that controls on and off of the plurality of switching elements. The switching elements of an upper arm include PMOSs connected to a same voltage source. The switching elements of a lower arm include NMOSs. The controller turns off the PMOS when the alarm signal is output, and turns on the NMOS when the trigger signal is output.
Claims10
A drive circuit comprising:
- a plurality of switching elements that is configured to drive a power semiconductor element;
- an overcurrent detector that is configured to output an alarm signal in a case where a potential of a shunt resistor connected between a main terminal of the power semiconductor element and a ground is equal to or higher than a predetermined first threshold;
- a trigger signal generation circuit that is configured to output a trigger signal after the overcurrent detector starts outputting the alarm signal;
- and
- a controller that is configured to control on and off of the plurality of switching elements, wherein
- the plurality of switching elements includes switching elements of an upper arm, and switching elements of a lower arm,
- the switching elements of the upper arm include a first upper switching element and a second upper switching element that are connected to a same power supply,
- the switching elements of the lower arm include a first lower switching element and a second lower switching element, and
- the controller is further configured to receive the alarm signal and turn off the second upper switching element when the alarm signal is output to the controller, and is further configured to receive the trigger signal and turn on the second lower switching element when the trigger signal is output to the controller.
Dependencies are inferred from the claim text.