Hybrid mode control method

A hybrid mode control method, configured for a charging control or a discharging control of a battery of an LLC resonant converter, the method comprising steps of:

• controlling the LLC resonant converter to operate in a burst mode when determining that an output of the LLC resonant converter is in a light load,
• controlling the LLC resonant converter to operate in a PWM mode as a load of the LLC resonant converter increases or an output voltage of the LLC resonant converter increases in the charging control of the battery, and further controlling the LLC resonant converter to operate in a PFM mode as the load of the LLC resonant converter further increases or the output voltage of the LLC resonant converter further increases in the discharging control of the battery;
• controlling the LLC resonant converter to operate in the PFM mode from the burst mode as the load of the LLC resonant converter further increases or the output voltage of the LLC resonant converter further decreases in the discharging control of the battery, and further controlling the LLC resonant converter to operate in a PSM mode as the load of the LLC resonant converter further increases or the input voltage of the LLC resonant converter further decreases in the discharging control of the battery;
• and
• controlling the LLC resonant converter to operate in the PSM mode from the PFM mode as the load of the LLC resonant converter further increases or the output voltage of the LLC resonant converter further increases in the charging control of the battery;
• wherein the LLC resonant converter is controlled to operate in the PSM mode with a fixed duty cycle, a fixed frequency, and a variable phase shift in the charging control of the battery;
• wherein the frequency when operating in the PSM mode is less than the frequency when operating in the PFM mode.