| 摘要 |
PROBLEM TO BE SOLVED: To provide a heater control apparatus which can realize equal temperature control characteristic without adjustment for dual system input voltages which are different by a factor of about two. SOLUTION: A a heater control apparatus is constituted by a energization control circuit 9 having a bridge diode 10, a current controlling resistor 11, a Zener diode 12, photocoupler 13 and a energizing signal generating circuit 14. The control circuit 9 discriminates line of input voltage. When the line of input voltage is low, the control circuit 9 makes full-wave energization to a heater 3. On the other hand, when the line of input voltage is high, the control circuit 9 makes a quarter wave energization to the full-wave energization to the heater 3. Thus the control circuit 9 generates an energizing signal g2 so that temperature control characteristics in the two lines are equal.
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