Capacitor charger system, power modulator and resonant power converter

A capacitor charger system for a capacitor to be charged and discharged in cycles, wherein the capacitor charger system comprises a resonant power converter for connection to said capacitor via an output rectifier,

• said resonant power converter comprises a switch-based bridge network, an internal transformer, a resonant circuit, and an amplitude stabilization circuit,
• said switch-based bridge network comprises at least one pair of controlled switches,
• said resonant circuit includes a series-resonant branch comprising at least one capacitive component and at least one inductive component, and said resonant circuit is connected in the circuit path to a midpoint between a pair of controlled switches of the switch-based bridge network, and the capacitive part of said resonant circuit is connected in a series path with a primary winding of said internal transformer,
• said amplitude stabilization circuit is configured to provide stabilization of the resonant amplitude of the resonant circuit, and said amplitude stabilization circuit includes one-way conducting circuitry connected between:
• i) an unrestricted node defined by a junction anywhere in the circuit path from a capacitive component to an inductive component of the series-resonant branch, and
• ii) at least one connection point of said resonant power converter having a predefined voltage level at operation,
• to thereby stabilize the resonant amplitude to vary within predefined limits;
• and
• said resonant power converter is configured for connection to said output rectifier via the secondary winding of said internal transformer.