Is a
Patent attributes
Patent Jurisdiction
Patent Number
Patent Inventor Names
Koji Nakamuta0
Minoru Hirahara0
Yoshito Koyama0
Date of Patent
May 22, 2012
Patent Application Number
12549658
Date Filed
August 28, 2009
Patent Citations Received
Patent Primary Examiner
Patent abstract
A thermostatic-chamber temperature control device includes: a heating element for heating a thermostatic chamber; a bridge circuit having a temperature sensitive element whose resistance value varies in accordance with the temperature of the heating element; a detection circuit for detecting an unbalanced voltage of the bridge circuit; a PWM signal generating circuit for generating a PWM signal corresponding to the unbalanced voltage detected by the detection circuit; and a switching element that has a current output terminal connected to the heating element and a current input terminal connected to a power supply circuit and is driven on the basis of the PWM signal generated by the PWM signal generating circuit.
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