Resonant converter

A resonant converter, comprising:

• a primary circuit, configured to receive an input voltage, and comprising a resonant inductor;
• a transformer, having a primary side electrically connected to the primary circuit;
• a secondary circuit, electrically connected to a secondary side of the transformer, and configured to provide an output voltage;
• a current sensor, electrically connected to the primary circuit, wherein when a current flowing through the resonant inductor passes through the current sensor, the current sensor generates a current differential signal correspondingly;
• and
• a controller, configured to perform double integration on the current differential signal to acquire an electric charge signal, and configured to control operation of the resonant converter according to the electric charge signal, the input voltage and the output voltage,
• wherein the current sensor comprises a coreless ring coil.

A resonant converter, comprising:

• a switch circuit, comprising a plurality of switches, and receiving an input voltage;
• a resonant circuit, electrically connected to the switch circuit;
• a transformer, comprising a primary winding and a secondary winding, wherein the primary winding is electrically connected to the resonant circuit;
• a rectifier circuit, electrically connected to the secondary winding of the transformer, and providing an output voltage;
• a current sensor, electrically connected to the resonant circuit, wherein when a current of the resonant circuit passes through the current sensor, the current sensor generates a current differential signal correspondingly;
• and
• a controller, configured to perform double integration on the current differential signal to acquire an electric charge signal, and configured to control operation of the plurality of switches of the switch circuit according to the electric charge signal, the input voltage and the output voltage,
• wherein the current sensor comprises a coreless ring coil.