PROTECTION CIRCUIT FOR SWITCHING ELEMENT

PROBLEM TO BE SOLVED: To provide a protection circuit for a switching element that allows a nitride FET to perform a high-speed switching operation and allows protecting the nitride FET from a surge voltage.SOLUTION: A protection circuit for a switching element includes: a high-side element M1 and a...

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1. Verfasser:	TASAKA YASUSHI
Format:	Patent
Sprache:	eng
Schlagworte:	APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC,OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWERSUPPLY SYSTEMS BASIC ELECTRIC ELEMENTS BASIC ELECTRONIC CIRCUITRY CONTROL OR REGULATION THEREOF CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUTPOWER CONVERSION OR DISTRIBUTION OF ELECTRIC POWER ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR ELECTRICITY GENERATION PULSE TECHNIQUE SEMICONDUCTOR DEVICES
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To provide a protection circuit for a switching element that allows a nitride FET to perform a high-speed switching operation and allows protecting the nitride FET from a surge voltage.SOLUTION: A protection circuit for a switching element includes: a high-side element M1 and a low-side element M2 that are connected in series to each other; a high-side pre-driver 11 that outputs a signal turning on/off the high-side element; a low-side pre-driver 12 that outputs a signal turning on/off the low-side element so as to become the opposite on/off state to the high-side element; a switching element Tr1 that has a control terminal connected to the connection point between the high-side element and the low-side element; a diode D1 that has a cathode connected to one terminal of the switching element; and a controller 21 that has an input terminal connected to an anode of the diode, supplies a current to the control terminal of the switching element at the time of breaking of the diode, and supplies a signal directing off of the low-side element to the low-side pre-driver.