Output rising slope control technique for power converter
AssigneesDelta Electronics, Inc., Delta Electronics (Thailand) Public Co., Ltd.
InventorsSakda Sae-Ueng, Mingchun Xu
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Abstract
An output voltage rising slope control technique for a power converter is addressed. The output voltage rising slope control technique according to the present invention basically uses a reference voltage generator to precipitate the rising slopes of multiple output voltages of a power converter to approach a unanimity with each other during a start-up period, and thereby avoiding the occurrence of system faults in the power converter due to the instantaneously rapid increase of output voltage thereof during the start-up period.
Claims12
A power converter for providing multiple output voltages of predetermined levels, comprising:
- at least two magnetic amplifiers, each of which is magnetically coupled with an AC voltage induced at a winding of a transformer for amplifying the AC voltage;
- at least two switch circuits, each of which is coupled to a corresponding one of the magnetic amplifiers for converting an amplified AC voltage from a corresponding one of the magnetic amplifiers into a DC voltage in response to an on/off operation thereof;
- at least two output filters, each of which is coupled to a corresponding one of the switch circuits for providing a predetermined level of output voltage for a load;
- at least two switch control circuits, each of which compares an output voltage with a reference voltage and in response thereto generate a control signal to control an on/off operation of a corresponding one of the switch circuits;
- and
- a reference voltage generator coupled to each of the switch control circuit for providing each of the switch control circuit with a reference voltage, wherein the reference voltages provided by the reference voltage generator are sufficient to have the rising slopes of each output voltage of the power converter approach a unanimity with each other during a start-up period of the power converter;
- wherein the reference voltage generator includes a linear voltage generating circuit for generating a linear voltage with a rising slope, a diode having an anode for receiving a remote ON/OFF signal and a cathode for receiving the linear voltage with a resing slope, a first reference voltage generating block for limiting the linear voltage with a rising slope based on a predetermined voltage level and thereby generating a first reference voltage, and a second reference voltage generating block for imposing a time delay on the linear voltage with a rising slope and tuning a rising slope of the linear voltage with a rising slope, and thereby generating a second reference voltage.
A reference voltage generator for a power converter, comprising:
- a linear voltage generating circuit for generating a linear voltage with a rising slope;
- a first reference voltage generating block for limiting the linear voltage with a rising slope based on a predetermined voltage level and thereby generating a first reference voltage;
- and
- a second reference voltage generating block for imposing a time delay on the linear voltage with a rising slope and tuning a rising slope of the linear voltage with a rising slop;
- and thereby generating a second reference voltage.
Dependencies are inferred from the claim text.