Temperature detection circuit
AssigneeMitsubishi Electric Corporation
InventorToshiyuki Kumagai
Life of this patent
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Abstract
A PWM signal generation circuit in an IPM includes an amplification circuit amplifying a voltage across terminals of a temperature sensor, a comparison circuit generating a PWM signal based on a triangular wave signal and an output signal of the amplification circuit, and a correction circuit setting an amplification ratio of the amplification circuit such that a pulse width of the PWM signal is set to a reference pulse width in an adjustment mode in which a switching element is caused to have a reference temperature. Consequently, characteristic variations in the temperature sensor, the amplification circuit, and the like can be corrected, and the temperature of the switching element can be detected with high accuracy.
Claims8
A temperature detection circuit connected to a temperature sensor having a resistance varying in accordance with a temperature of a switching element, comprising:
- a pulse-width modulation (PWM) signal generation circuit which outputs a PWM signal indicating the temperature of said switching element based on the resistance of said temperature sensor and a correction value;
- and
- a correction circuit which sets said correction value such that, in an adjustment mode in which said switching element is caused to have a predetermined reference temperature, the PWM signal output from said PWM signal generation circuit indicates said reference temperature.
Dependencies are inferred from the claim text.