Patent ID: 9609716
Date: 2017-03-28
CPC Classifications: H02H,H05B,Y02B

Claim:
1. An undervoltage protection circuit for an LED lamp comprising: a DC/DC converter connected to a power module, the DC/DC converter having an enable EN pin; a controlling circuit module electrically connected to the DC/DC converter, the controlling circuit module comprising: a signal collecting unit configured for collecting an input signal from the power module; a signal comparing unit electrically connected to the signal collecting unit, the signal comparing unit generates a first output voltage based on comparison of the input signal with a threshold voltage; an inverting circuit having an output connecting to the enable EN pin of the DC/DC converter; and a signal processing unit electrically connected to the signal comparing unit, the signal processing unit generating a second output signal, the second output signal connecting, through the inverting circuit, to the enable EN pin of the DC/DC converter, the second output signal turns on or turns off the DC/DC converter based on to the first output voltage from the signal comparing unit, wherein the controlling circuit module comprises two resistors R