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US 2015/0309090 A1Published application
Overcurrent detection circuit
AssigneeFuji Electric Co., Ltd.
InventorMasashi AKAHANE
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AssigneeFuji Electric Co., Ltd.
InventorMasashi AKAHANE
Estimating the term…
An overcurrent detection circuit includes a current detection resistor that generates a voltage in proportion to current flowing through a switching element and a comparator that compares the voltage detected via the current detection resistor and a reference voltage generated by a reference voltage generation circuit to thereby detect overcurrent flowing through the switching element. In particular, the reference voltage generation circuit includes: a first resistance voltage dividing circuit that resistance-divides a standard voltage by connecting, in series, two types of resistors having different temperature characteristics; a second resistance voltage dividing circuit that resistance-divides the standard voltage by connecting, in series, resistors having the same temperature characteristics; and an instrumentation amplifier that generates the reference voltage according to the difference between the divided output voltages of the first and second resistance voltage dividing circuits.
An overcurrent detection circuit for use in a driver circuit that turns a switching element ON/OFF to switch input power and that controls operation of the driver circuit by detecting current flowing through the switching element, the switching element having a current detection element incorporated therein, said overcurrent detection circuit comprising:
An overcurrent detection circuit for use in a driver circuit that turns a switching element on/off to switch input power and that controls operation of the driver circuit by detecting current flowing through the switching element, said overcurrent detection circuit comprising:
Dependencies are inferred from the claim text.