Abstract:
The invention refers to a soft-start and output voltage control technique for resonant converters. A first aspect of the invention refers to a resonant converter comprising: an input stage as a switch network including semiconductor switching devices, a resonant circuit, and a controller for controlling the switch network, wherein the controller is adapted to operate the resonant converter during a start up process, wherein the switching frequency and the duty-cycle are kept constant during a first time interval (t1). The invention also refers to a method for controlling a resonant converter, wherein the converter is started up by maintaining switching frequency and duty-cycle constant during a first time interval (t1). The converter is operated in a burst mode during the starting up process. The invention provides a fast and precise soft-start and output voltage control method for resonant converters, especially for light load conditions.
Abstract:
A method applied in a driving circuit is disclosed. The driving circuit is coupled between a voltage source (11) and a load (13) and configured to drive the load. The method includes: forming, by the driving circuit, a first current (I ch ) from the voltage source to the load; and forming, by the driving circuit, a second current (I dis ) from the load back to the voltage source.
Abstract:
A power supply electronic circuit is provided. The power supply electronic circuit comprises: an intermediate bus converter (IBC), arranged to convert a voltage inputted to the IBC to an intermediate bus voltage on an intermediate bus; at least one direct current to direct current (DC-DC) or point of load (POL) converter, connected to the intermediate bus and arranged to convert the intermediate bus voltage to a voltage for feeding a load; and a capacitor tank connected to the intermediate bus and arranged as hold up capacitor tank to preserve power supply to the load. The IBC comprises a current ripple control circuit for suppressing current ripple in an input of the power supply electronic circuit.
Abstract:
A super-efficient single-stage switching power amplifier is realized by not incorporating a rectification process in its power conversion loop while incorporating a bidirectional active clamping circuit to not only remove or maximally reduce otherwise occurring disruptive ringing and spikes but also convert the energy otherwise associated with the ringing and spikes to return energy that goes back to the DC power supply.