A power module for an electronic device, the power module comprising a converter circuit, the converter circuit comprising a capacitor module and a balance module, wherein the capacitor module comprises at least a first capacitor and a second capacitor, and the balance module comprises at least a first resonant circuit; the first resonant circuit comprises at least two switch groups and a first resonant tank configured to form a bridge between the at least two switch groups, one of the at least two switch groups (Q1-1, Q1-3) being connected to one end of the second capacitor and one end of the first capacitor, and another of the at least two switch groups (Q1-2, Q1-4) being connected to an other end of the second capacitor and an other end of the first capacitor, wherein the one end of the second capacitor is configured to receive an input voltage (V in) of the power module and the one end of the first capacitor is connected to a point of load of the power module; wherein the first resonant tank comprises a first resonant capacitor and a first resonant inductor; the first capacitor and the second capacitor are connected in series; and the balance module is configured to control each switch in the first resonant circuit, so that each switch is configured to work with the first resonant tank to affect a current, to balance a voltage between the two ends of the first capacitor and a voltage between the two ends of the second capacitor; wherein the one of the at least two switch groups in the first resonant circuit comprises at least a first switch and a third switch, the other of the at least two switch groups in the first resonant circuit comprises at least a second switch and a fourth switch; the first switch and the third switch are connected in series, the second switch and the fourth switch are connected in series, the one end of the second capacitor is connected to a first end of the first switch, the other end of the second capacitor is separately connected to a first end of the second switch, a second end of the third switch, and the one end of the first capacitor, and the other end of the first capacitor is connected to a second end of the fourth switch; one end of the first resonant tank is separately connected to a second end of the first switch and a first end of the third switch, and an other end of the first resonant tank is separately connected to a second end of the second switch and a first end of the fourth switch; and the first switch and the third switch are configured to not simultaneously turn on, and the second switch and the fourth switch are configured to not simultaneously turn on. the first resonant circuit comprises at least two switch groups and a first resonant tank configured to form a bridge between the at least two switch groups, one of the at least two switch groups (Q1-1, Q1-3) being connected to one end of the second capacitor and one end of the first capacitor, and another of the at least two switch groups (Q1-2, Q1-4) being connected to an other end of the second capacitor and an other end of the first capacitor, wherein the one end of the second capacitor is configured to receive an input voltage (V in) of the power module and the one end of the first capacitor is connected to a point of load of the power module; wherein the first resonant tank comprises a first resonant capacitor and a first resonant inductor; the first capacitor and the second capacitor are connected in series; and the balance module is configured to control each switch in the first resonant circuit, so that each switch is configured to work with the first resonant tank to affect a current, to balance a voltage between the two ends of the first capacitor and a voltage between the two ends of the second capacitor; wherein the one of the at least two switch groups in the first resonant circuit comprises at least a first switch and a third switch, the other of the at least two switch groups in the first resonant circuit comprises at least a second switch and a fourth switch; the first switch and the third switch are connected in series, the second switch and the fourth switch are connected in series, the one end of the second capacitor is connected to a first end of the first switch, the other end of the second capacitor is separately connected to a first end of the second switch, a second end of the third switch, and the one end of the first capacitor, and the other end of the first capacitor is connected to a second end of the fourth switch; one end of the first resonant tank is separately connected to a second end of the first switch and a first end of the third switch, and an other end of the first resonant tank is separately connected to a second end of the second switch and a first end of the fourth switch; and the first switch and the third switch are configured to not simultaneously turn on, and the second switch and the fourth switch are configured to not simultaneously turn on.