Abstract: An apparatus comprises a switch-capacitor network, a power-switch network and a controller. The switch-capacitor network has a plurality of control switches and a plurality of flying capacitors, where the control switches are configured to connect two of the flying capacitors in series in a first configuration and in parallel in a second configuration. The power-switch network has a plurality of power switches and is coupled between an input port having an input voltage and an output port having an output voltage, where the power switches are configured to couple the switch-capacitor network to the input port and the output port in different ways during a charging phase and a discharging phase. The controller is configured to operate the control switches to configure the switch-capacitor network into different configurations during the charging phase or the discharging phase such that a ratio of the output voltage over the input voltage is changed in an operation mode.

Abstract: A system includes a first device, a second device, and a power control block. The first device has a first power converter and a first resonator which has a first resonant capacitor and a first coil. The second device has a second power converter and a second resonator which has a second resonant capacitor and a second coil. The second power converter is coupled to a ratio-controllable power converter, and the first coil and the second coil are magnetically coupled. The power control block is configured to adjust the system frequency, the second power converter output voltage and the current in the first coil in coordination.

Abstract: A system includes a first device, a second device, and a power control block. The first device has a first power converter and a first resonator which has a first resonant capacitor and a first coil. The second device has a second power converter and a second resonator which has a second resonant capacitor and a second coil. The second power converter is coupled to a ratio-controllable power converter, and the first coil and the second coil are magnetically coupled. The power control block is configured to adjust the system frequency, the second power converter output voltage and the current in the first coil in coordination.