Isolated power control device, power conversion device and isolated power control method used in power conversion device

A power conversion device comprising:

• an isolated power control device comprising:
• an auxiliary isolated power circuit generating a target voltage signal according to a primary side remote on/off control signal, the target voltage signal having a plurality of voltage levels;
• and
• a voltage level identification unit configured for receiving the target voltage signal to output a secondary side remote on/off control signal;
• and
• a main isolated power device comprising:
• a main isolated power circuit comprising a primary circuit and a secondary circuit;
• and
• a main control circuit disposed on the side of the secondary circuit configured for receiving the secondary side remote on/off control signal;
• wherein the main control circuit controls the switches of the main isolated power circuit to perform at high frequency when the secondary side remote on/off control signal is at a first voltage level, the main control circuit controls the switches of the main isolated power circuit to stop operating when the secondary side remote on/off control signal is at a second voltage level different from the first voltage level.

An isolated power control method applied to a power conversion device, the power conversion device comprising an auxiliary isolated power circuit, the auxiliary isolated power circuit comprising a primary side and a secondary side isolated from each other, the isolated power control method comprising the following steps:

• providing a primary side remote on/off control signal to a control module of the auxiliary isolated power circuit to allow the control module to generate a switch control signal correspondingly;
• providing the switch control signal to a switch module of the auxiliary isolated power circuit;
• opening or closing the switches of the switch module according to the switch control signal to generate a target voltage signal, the target voltage signal having a plurality of voltage levels;
• and
• receiving the target voltage signal by a voltage level identification unit of the auxiliary isolated power circuit to output a secondary side remote on/off control signal so as to control a main isolated power device.