Patent ID: 9392671
Filing Date: 2016-07-12
CPC Classification: H05B

Claim Text:
1. A lamp controller with extended life wherein: a lamp is disposed with a light source and two same drive circuits; a first one of the drive circuits is a work drive circuit, and a second one of the drive circuits is a backup drive circuit; outputs of the two drive circuits are parallel to each other and connected to the light source; a controller includes an AC/DC conversion circuit, microcontroller, switch circuit and drive state detection circuit; the AC/DC conversion circuit converts the mains supply to a low-voltage direct current and supplies power to the microcontroller and the switch circuit; the drive state detection circuit gets work state information of the work drive circuit and submits the work state information to the microcontroller; the microcontroller controls the switch circuit to alternatively connect the input of the work drive circuit or the backup drive circuit to the mains supply according to the work state information of the work drive circuit; the drive state detection circuit is disposed with two same lines; each line is disposed with an independent AC input, AC output and signal detect output; the switch circuit is disposed with an AC input, a first AC output, a second AC output and signal control input; the AC input of the switch circuit is connected to the mains supply; the first AC output of the switch circuit is connected to the AC input of the first line of the drive state detection circuit; the second AC output of the switch circuit is connected to the AC input of the second line of the drive state detection circuit; the signal control input of the switch circuit is connected to the signal control output of the microcontroller; the AC output of the first line of the drive state detection circuit is connected to the input of the work drive circuit; the AC output of the second line of the drive state detection circuit is connected to the input of the backup drive circuit; the signal detect outputs of the first line and second line of the drive state detection circuit are separately connected to the corresponding signal detect input of the two signal detect inputs of the microcontroller; the switch circuit is consisting of an electromagnet relay and a signal control amplifier; the earth line of the AC input of the switch circuit is connected to that of the first AC output and the second AC output; the AC/DC conversion circuit supplies power to the signal control amplifier; the input terminal of the alternative switch of the electromagnet relay is the live line of the AC input of the switch circuit, two output terminals of the alternative switch of the electromagnet relay are separately the live line of the first and the second AC output of the switch circuit; the signal control amplifier amplifies the control signal of the microcontroller and motivates the coil of the electromagnet relay, making the alternative switch of the electromagnet relay alternatively connected the input terminal to one of the two output terminals.