Abstract: In one embodiment, a quasi-resonant power supply controller is configured to select particular valley values of a switch voltage to determine a time to enable a power switch. The valleys values are selected responsively to a range of values of a feedback signal.

Abstract: In one embodiment, a quasi-resonant power supply controller is configured to select particular valley values of a switch voltage to determine a time to enable a power switch. The valleys values are selected responsively to a range of values of a feedback signal.

Abstract: A system (10) regulates current and voltage in a power system by using a correction signal that is modified to compensate for errors associated with manufacturing variations. The correction signal controls a power switch (49) that selectively sources/shunts current to/from the output load (26) and power source. The compensation technique applies to systems conducting either an A.C. or a D.C. voltage. A current controller (44) is placed in a control loop. The current controller contains circuitry having an offset voltage and loop gain errors as a result of manufacturing variations. At least one of the offset voltage and loop gain are dynamically calculated by a loop controller (38) and the result is used to modify the correction signal to provide an accurate output load voltage and power line current.

Abstract: A system (10) regulates current and voltage in a power system by using a correction signal that is modified to compensate for errors associated with manufacturing variations. The correction signal controls a power switch (49) that selectively sources/shunts current to/from the output load (26) and power source. The compensation technique applies to systems conducting either an A.C. or a D.C. voltage. A current controller (44) is placed in a control loop. The current controller contains circuitry having an offset voltage and loop gain errors as a result of manufacturing variations. At least one of the offset voltage and loop gain are dynamically calculated by a loop controller (38) and the result is used to modify the correction signal to provide an accurate output load voltage and power line current.

Abstract: An AC-to-DC-converter (100) for driving a dynamic load (160), such as a motor, has a rectifier bridge (110), a coil (120), and a switch (130) to boost an output capacitor (150) by a coil current I(t). The current (I(t)) has periodical minimum values. The converter (100) is controlled by a monitor (170) and a modulator (180). The monitor (170) monitors the converter output (signal 102) during a predetermined monitoring interval (t.sub.M1, t.sub.M2) which is inside a minimum-to-minimum interval of the current (I(t)) and classifies changes (voltage .DELTA.V.sub.OUT) and/or current .DELTA.I.sub.OUT) into a first case (A) where the change exceeds a predetermined threshold (.DELTA.V.sub.TH) and a second case (B) where the change does not exceed the threshold. In order to shape the current (I(t)), in the first case (A), the modulator (180) immediately alters the current (I(t)), and in the second case (B), the modulator (180) alters the current (I(t)) when the current has its next minimum.