Patent ID: 9419537
Filing Date: 2016-08-16
CPC Classification: H02M,H05B,Y02B

Claim Text:
1. A driver circuit for powering a load, comprising: an input for connection to a ballast; a rectifier for converting AC power received from the input into DC power, the rectifier including a rectifier input; a switch electrically connected to the rectifier input, wherein the switch is activated to create a short circuit at the rectifier inputs in response to receiving an activation signal; a fault circuit electrically connected to the switch, wherein the fault circuit generates the activation signal in response to detecting at least one of an over voltage, an over temperature, and an over current condition of the driver circuit; and a charge pump circuit for providing substantially constant DC current to the fault circuit, the charge pump circuit including a first capacitor and a zener diode, wherein the first capacitor limits current to the zener diode and the zener diode limits a voltage provided to the fault circuit.