Patent ID: 9614451
Date: 2017-04-04
CPC Classifications: H02M

Claim:
1. A power apparatus for an external load, comprising: a transformer for transforming an input voltage into an output voltage and an auxiliary voltage in response to an operating signal, wherein the transformer comprises a first coil, a second coil and an auxiliary coil electromagnetically coupled to one another, the first coil is configured to receive the input voltage, the second coil is configured to provide the output voltage for the external load, and the auxiliary coil is configured to provide the auxiliary voltage; a power coordinating unit comprising: a control unit coupled between the first node and the first coil and configured to selectively generate the operating signal; and an internal load coupled to the second node, wherein when the control unit operates in a protective mode, the control unit is configured not to generate the operating signal, the power coordinating unit is configured to generate a coordinating current supplied to the internal load by using a starting voltage of the first node.