Isolation circuit and withstand voltage testing method therefor

A withstand voltage testing method for an isolation circuit, comprising:

• providing an isolation circuit, wherein the isolation circuit comprises a power factor correction circuit and a resonant conversion circuit sequentially connected in series, wherein the resonant conversion circuit comprises a primary circuit, a resonant circuit and a secondary circuit sequentially connected in series;
• the primary circuit is electrically connected to the power factor correction circuit, the resonant circuit includes a resonant inductor, a resonant capacitor and a transformer, wherein the transformer includes a primary winding and a secondary winding, and the resonant inductor, the resonant capacitor and the primary winding are connected in series;
• and the secondary circuit is electrically connected to the secondary winding;
• wherein at least one of the primary winding and the secondary winding comprises a winding wire comprising a wire and an insulating layer wrapping around the wire, and along a direction parallel to an X-axis, the insulating layer is disposed through an edge of the insulating layer on the wire, wherein the edge of the insulating layer is arranged in a direction parallel to the X-axis, and then wraps around the wire in a Y-axis direction perpendicular to the X-axis direction until a number of insulating layers of the winding wire is at least three;
• and
• short-circuiting an input terminal and an output terminal of the isolation circuit for performing a high voltage test and obtaining a withstand voltage value between the input terminal and the output terminal of the isolation circuit, wherein the withstand voltage value is ranged between 4000 VAC and 5000 VAC.