Patent ID: 8824176
Filing Date: 2014-09-02
Classification: H02M,Y02B,Y02P

Abstract:
1. A resonant converting circuit comprising: a resonant circuit, adapted to execute a power conversion for converting an input voltage into an output voltage; a current detecting circuit, coupled to a primary side of the resonant circuit to detect a resonant current flowing through the primary side of the resonant circuit and generating a current detecting signal; and a resonant controller, controlling the power conversion of the resonant circuit, wherein the resonant controller comprises an over current judgment unit and an over current protection unit, the over current judgment unit determines whether the resonant current is higher than an over current value according to the current detecting signal, the over current protection unit generates a protection signal in response to a determined result of the over current judgment unit and an indication signal indicative of an operating state of the resonant controller; wherein, the resonant controller executes a corresponding protection process in response to the protection signal, and the operating states of the resonant controller include a starting state and a normal operating state, wherein when the indication signal indicates that the resonant controller operates under the starting state and one of the current detecting signal is higher than a first predetermined level for a predetermined time period and the current detecting signal is higher than a second predetermined level occurs, the resonant controller enters a latch process to stop the power conversion of the resonant circuit, wherein the first predetermined level is lower than the second predetermined level.