Temperature control circuit



(57)【要約】 【課題】 被温度制御部材の長寿命化を図った温度制御 回路を提供する。 【解決手段】 温度制御信号をPWM(パルス幅変調) 信号として出力するCPUと、このPWM信号と温度セ ンサからの出力信号を比較する比較器と、この比較器の 出力に基づいて温度制御素子を駆動するドライバからな る温度制御回路において、リセット状態や異状等CPU より正常な温度制御信号が出力しなくなった場合、正常 な温度制御信号が出力されるまでの間、前記温度制御素 子に設定温度の近傍若しくは破壊しない範囲の仮制御信 号を与える仮温度設定手段を設けた。
PROBLEM TO BE SOLVED: To provide a temperature control circuit for lengthening the life of a member whose temperature is to be controlled. SOLUTION: This temperature control circuit is constituted of a CPU 1 for outputting a temperature control signal as a PWM(pulse width modulation) signal, a comparator for comparing this PWM signal with an output signal from a temperature sensor, and a driver for driving a temperature control element based on the output of this comparator. This temperature control circuit is also provided with a temporary temperature setting means for applying a temporary control signal in the neighborhood of a set temperature or in a non-destructive range to a temperature control element until a normal temperature control signal is outputted from the CPU 1 when any normal temperature control signal is not outputted from the CPU 1 due to a reset state or abnormality or the like. COPYRIGHT: (C)2000,JPO




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    US-7082272-B2July 25, 2006Kabushiki Kaisha Toshiba, Toshiba Tec Kabushiki KaishaImage forming apparatus