HIGH-FREQUENCY SWITCH POWER SUPPLY AND METHOD FOR DETECTING HIGH-FREQUENCY CURRENT

摘要

The present invention provides a high-frequency switch mode power supply and a method for detecting a high-frequency current. The system includes a power input circuit, a power output circuit, a power transformer, and a current detecting circuit. The current detecting circuit includes: a current transformer, which includes a primary winding and at least one secondary winding, where the primary winding is connected in series to an impedor to serve as a first impedance branch connected in series in the loop formed of the power input circuit and the power transformer; at least one second impedance branch, connected in parallel to the first impedance branch and then connected in series in the loop; and a detecting unit, connected to the secondary winding and configured to detect the current output by the secondary winding. The present invention can reduce the size of a current detecting circuit.