Temperature sensor circuit
AssigneeFuji Electric Device Technology Co., Ltd.
InventorsTakatoshi OOE, Ryuu SAITOU, Morio IWAMIZU
Life of this patent
Estimating the term…
Abstract
A temperature sensor circuit is provided that facilitates preventing a too-high overshooting voltage from occurring at an output terminal when a power supply is connected to the temperature sensor circuit. The temperature sensor circuit includes a short-circuiting device, disposed in parallel to depletion mode NMOS, that short-circuits the drain and source of depletion mode NMOS when a power supply is connected; and delay device that transmits a signal for short-circuiting the drain and source of depletion mode NMOS for a certain period from the time point of power supply connection to short-circuiting device for preventing the voltage at output terminal of temperature sensor circuit from overshooting.
Claims8
A temperature sensor circuit comprising:
- a first switching device comprising a collector connected to a power supply, a gate, and an emitter;
- a diode comprising an anode connected to the gate of the first switching device and a cathode connected to the collector of the first switching device;
- a depletion mode n-channel MOSFET comprising a drain connected to the emitter of the first switching device, a source connected to a ground, and a gate fixed at a ground potential;
- an output terminal connected to the drain of the depletion mode n-channel MOSFET;
- a short-circuiting device connecting the output terminal to the ground;
- and
- a delay device outputting a signal that makes the short-circuiting device work for a predetermined period of time from a time point, at which the power supply is connected to the temperature sensor circuit.
Dependencies are inferred from the claim text.