Temperature detecting circuit

A temperature detection circuit, temperature value technology, applied in thermometers, thermometers with analog-to-digital converters, and heat measurement, etc., can solve problems such as difficulties, achieve the effect of suppressing cost increase, satisfying insulation and high responsiveness
CN101983322AInactive Publication Date: 2011-03-02KK TOSHIBA
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
KK TOSHIBA
Publication Date
2011-03-02
Estimated Expiration
Not applicable · inactive patent

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Abstract

Provided is a temperature detecting circuit which suppresses cost increase at minimum by adding a small number of components and meets requirements of insulation and high response. The temperature detecting circuit (15) outputs a first PWM signal, which corresponds to the temperature of a first temperature sensor (TDX), as a signal insulated from the first temperature sensor (TDX) from a photo interrupter (32). A temperature detecting circuit section (34) outputs a second PWM signal, which corresponds to the temperature of a second temperature sensor (TDU), as a signal insulated from the second temperature sensor (TDU) from a photo interrupter (56). A processing device (10) calculates a higher temperature of the temperatures detected by the first and the second temperature sensors (TDU, TDX), based on the PWM signal outputted from the photo interrupters (32, 56).
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Description

technical field

[0001] The present invention relates to a temperature detection circuit, and in particular to temperature detection of switching elements constituting an inverter device. Background technique

[0002] An electric motor is used as a power source of a hybrid vehicle or an electric vehicle combined with an engine. When driving a motor, an inverter is used to obtain a predetermined torque and frequency. Inverters are installed in automobiles, and miniaturization and high power are required to ensure passenger space.

[0003] The operating temperature of the inverter greatly fluctuates depending on the driving environment of the vehicle. In particular, in a hybrid vehicle in which the inverter is mounted in the engine compartment, the inverter becomes high in temperature due to the influence of heat generated by the engine. The temperature of the switching element (hereinafter referred to as SW element) in the inverter is increased due to the constant loss cause...

Claims

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