Resonant control device and resonant control method thereof

A resonant control device comprising:

• a feedback controller connected with an output terminal of a resonant converter, and said output terminal is connected with a load, and an output voltage is applied across said load, and said feedback controller receives a setting voltage and said output voltage and uses said setting voltage to perform voltage compensation on said output voltage to generate a control value;
• and
• a processor connected with said feedback controller and said resonant converter, presetting a switch value, receiving said control value, generating pulse modulation signals according to said control value and said switch value, and using said pulse modulation signals to drive said resonant converter to regulate said output voltage, and said resonant converter determines a maximum frequency and a minimum frequency, and said switch value equals said minimum frequency divided by said maximum frequency, and when said control value is larger than or equal to said switch value, said pulse modulation signals are pulse frequency modulation signals, and when said control value is less than said switch value, said pulse modulation signals are pulse width modulation signals whose frequency is a first fixed value less than said maximum frequency, and said first fixed value is larger than or equal to said minimum frequency.