Patent ID: 7279954
Filing Date: 2007-10-09
Classification: G01K

Abstract:
1. An on-chip temperature detection device, comprising: a bipolar type power transistor that is driven by a first drive signal; a mirror transistor a base of which is connected together with a base of said bipolar type power transistor, an emitter potential of which is different from an emitter potential of said bipolar type power transistor, and in which a collector current, which is proportional to a collector current of said power transistor, flows, when said power transistor is being driven by said first drive signal; a second drive signal generation circuit that generates a second drive signal which drives said power transistor to be OFF; a voltage detection section that detects the voltage between the base and the emitter of said mirror transistor; and a calculation section that calculates a chip temperature of said power transistor, when said mirror transistor and said power transistor are being driven by said second drive signal, based upon at least the voltage between the base and the emitter of said mirror transistor detected by said voltage detection section.