ENERGIZING CONTROLLER OF HEATER FOR CARBURETOR

PROBLEM TO BE SOLVED: To prevent the switch and the comparator being destroyed by chattering phenomenon of switch and impression of reverse voltage in an energizing controller of the heater for carburetor which changes the switch in the on/off by changing an output voltage of the comparator by the change in input voltage into the comparator that changes according to the change in the resistance of thermistor. SOLUTION: In this energizing controller, hysteresis characteristic is given by the action of the return resistance connected with a comparator 4 to output voltage of the comparator 4 which controls on/off of a switch 6 to prevent the chattering phenomenon of the switch 6. Reverse voltage is prevented from being impressed to the comparator 4 when the plus and the minus of direct current power supply 1 are connected by mistake with a use of a field-effect transistor FET 1 as switch 6 and with an action of the diode.