A resonant power conversion apparatus comprising: a power source configured to supply power; a capacitor connected in parallel to the power source, the capacitor is configured to be charged with the power from the power source; a discharge circuit connected in parallel to the capacitor, and including a resistor and a switch connected in series, the discharge circuit is configured to discharge the capacitor before the power is supplied from the power source to a load; a microcontroller unit, MCU,; and a switch control circuit configured to provide a switch control signal to the switch to control a discharge time point and a discharge period of the discharge circuit, characterised in that the switch control circuit is configured to: acquire a zero-voltage cross signal and a voltage comparator signal, and determine the discharge time point and/or the discharge period based on the zero-voltage cross signal and the voltage comparator signal, wherein the zero-voltage cross signal is a signal in which a High signal and a Low signal cross each other when an input voltage from the power source is zero, and wherein the voltage comparator signal is a High signal when the input voltage from the power source is less than or equal to a predetermined magnitude, and the voltage comparator signal is a Low signal when the input voltage from the power source is greater than the predetermined magnitude, and wherein the switch control circuit is further configured to receive a discharge initiation signal from the MCU, and to output the switch control signal to the switch based on the discharge initiation signal, the zero-voltage cross signal, and the voltage comparator signal. a power source configured to supply power; a capacitor connected in parallel to the power source, the capacitor is configured to be charged with the power from the power source; a discharge circuit connected in parallel to the capacitor, and including a resistor and a switch connected in series, the discharge circuit is configured to discharge the capacitor before the power is supplied from the power source to a load; a microcontroller unit, MCU,; and a switch control circuit configured to provide a switch control signal to the switch to control a discharge time point and a discharge period of the discharge circuit, characterised in that the switch control circuit is configured to: acquire a zero-voltage cross signal and a voltage comparator signal, and determine the discharge time point and/or the discharge period based on the zero-voltage cross signal and the voltage comparator signal, wherein the zero-voltage cross signal is a signal in which a High signal and a Low signal cross each other when an input voltage from the power source is zero, and wherein the voltage comparator signal is a High signal when the input voltage from the power source is less than or equal to a predetermined magnitude, and the voltage comparator signal is a Low signal when the input voltage from the power source is greater than the predetermined magnitude, and acquire a zero-voltage cross signal and a voltage comparator signal, and determine the discharge time point and/or the discharge period based on the zero-voltage cross signal and the voltage comparator signal, wherein the zero-voltage cross signal is a signal in which a High signal and a Low signal cross each other when an input voltage from the power source is zero, and wherein the voltage comparator signal is a High signal when the input voltage from the power source is less than or equal to a predetermined magnitude, and the voltage comparator signal is a Low signal when the input voltage from the power source is greater than the predetermined magnitude, and wherein the switch control circuit is further configured to receive a discharge initiation signal from the MCU, and to output the switch control signal to the switch based on the discharge initiation signal, the zero-voltage cross signal, and the voltage comparator signal.