| 摘要 |
A valve driving circuit of a temperature controller is provided to reduce the number of wirings to two by operating a relay switch with a PTC element. A valve driving circuit of a temperature controller comprises: a PTC(Positive Temperature Coefficient) element in which electric resistance is increased and voltage of input alternating current power source is decreased; first and second switches(SW1,SW2) parallely connected between a signal line and a motor; a relay switch(4) having a first switch terminal(1), a second switch terminal(2) and a third switch terminal(3); and a relay driving part(5) controlling a switching direction of the relay switch by using the voltage of both ends of the PTC element. The switching direction of the relay switch is controlled with the relay driving part. |
