Stable form heating furnace control by temperature change circuit

The utility model discloses a stable form heating furnace control by temperature change circuit, including button K, relay J, transformer W and fuse FU, 220V alternating current and relay J's contact J -1 is connected to button K's one end, and relay J's contact J -1's the other end, heating pipe A and transformer W's winding N1 is connected to button K's the other end, and fuse FU and bidirectional thyristor Q1's a central electrode is connected to transformer W's winding N1's the other end. The utility model discloses the spike voltage that stable form heating furnace control by temperature change circuit used transient voltage to restrain the undulant production of diode pair commercial power restraines to set up power failure auto -lock module, utilized negative temperature coefficient thermistor to carry out heating control simultaneously, had consequently that stability is strong, simple structure and a manifold advantage of function.