Temperature sensitive alarm circuit
AssigneesHon Hai Precision Industry Co., Ltd., HONG FU JIN PRECISION INDUSTRY (ShenZhen) CO., LTD.
InventorYONG-ZHAO HUANG
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Abstract
A temperature controlling alarm circuit includes a power source including a high level terminal and a low level terminal, the low level terminal being grounded; a thermal diode including an anode and a cathode, the anode connected to the high level terminal; a resistor connected to the thermal diode in series; another resistor parallelly connected in parallel to the thermal diode and the said resistor which connected in series; a pnp-type transistor including a base, an emitter and a collector, the base and the emitter being respectively connected to two terminals of the another resistor; and an alarm connected between the collector of the PNP-type transistor and the low level terminal of the power source.
Claims5
A temperature controlling alarm circuit comprising:
- a power source comprising a high level terminal and a low level terminal, the low level terminal being grounded;
- a thermal diode comprising an anode and a cathode, the anode connected to the high level terminal of the power source;
- a resistor connected to the thermal diode in series;
- another resistor connected in parallel to the thermal diode and the said resistor which connected in series;
- a pnp-type transistor comprising a base, an emitter and a collector, the base and the emitter respectively connected to two terminals of said another resistor;
- an alarm connected between the collector of the transistor and the low level terminal of the power source.
Dependencies are inferred from the claim text.