| 摘要 |
<p>A controller for use in a power converter providing sensing of an isolated output is disclosed. An example controller includes a current controller to be coupled to an energy transfer element and an input of the power converter. A control circuit is included that generates a mode select signal coupled to be received by the current controller. A first, second or third current is enabled in the current controller in response to a selection of a first, second or third mode of operation, respectively, of the current controller by the control circuit. The first current is substantially zero, the second current is greater than the third current and the third current is greater than the first current. A first feedback circuit is coupled to the control circuit and is coupled to generate a first feedback signal representative of an output of the power converter during the first mode of operation after a period of operation of the second mode of operation of the current controller. A second feedback circuit is coupled to the control circuit and is coupled to generate a second feedback signal representative of the output of the power converter during the first mode of operation after a period of operation of the third mode of operation of the current controller. The control circuit is coupled to control selections of the first, second or third modes of operation in response to the first and second feedback signals to control a transfer of energy from the input of the power converter to the output of the power converter.</p> |
