Invention Grant
US08390972B2 Secondary protection approach for power switching applications 有权
电源开关应用的二次保护方法

Secondary protection approach for power switching applications
Abstract:
An apparatus and method for providing a primary and a secondary protection to a load in a power switching application uses an electronic circuit breaker to selectively permit a flow of current from an input to a load. The circuit breaker comprises a plurality of first switches coupled in parallel, and a plurality of fuses coupled to the plurality of first switches. In a disclosed embodiment, each first switch is coupled to a first fuse and to a second fuse. A controller opens and closes the plurality of first switches by commanding a driver current ON and OFF. The controller is operable to detect a fault condition and to open the plurality of first switches in response to the fault condition by commanding the driver current OFF. If the controller fails to open one of the first switches, one of the fuses coupled to the switch is operable to blow. In addition, the circuit breaker also comprises a charge pump that provides an electric current to a second plurality of switches to prevent the second plurality of switches form shorting the driver current.
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