Patent ID: 9077247
Filing Date: 2015-07-07
Classification: H02M

Abstract:
1. A control circuit for controlling a power supply, for generating a switching signal to switch the power supply, the control circuit having a detection terminal for detecting the status of the power supply, the control circuit comprising: a first protection circuit, coupled to the detection terminal, receiving a first detection signal via the detection terminal, the first protection circuit generating a limit signal in response to the first detection signal to limit output of the power supply; a second protection circuit, coupled to the detection terminal, receiving a second detection signal via the detection terminal, the second protection circuit generating a protection signal in response to the second detection signal to cut off the output of the power supply; a phase dividing circuit, coupled to the detection terminal, the first protection circuit and the second protection circuit, the phase dividing circuit generating the first detection signal and the second detection signal in response to the level of the switching signal; a logic unit, coupled to the first protection circuit and the second protection circuit, generating a reset signal in response to the limit signal and the protection signal; a flip-flop, coupled to the logic unit, generating the switching signal for switching the power supply in response to the reset signal; and a counting unit, coupled to the second protection circuit, generating a counting signal in response to the second protection signal and transferring the counting signal to the logic unit.