Two stage architecture for a monitor power supply
AssigneesSarnoff Corporation, Daewoo Electronics Co., Ltd.
InventorsRobert Amantea, Timothy Allen Pletcher, Jae-Hong Joo, Min-Sung Yang
Life of this patent
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Abstract
A power supply according to the principles of the inventions comprises two stages. The first stage is a power factor corrector stage. This stage provides the required line regulation, including greater than 95% power factor correction, and provides a range of outputs from approximately 5 volts to 200 volts with good load regulation at low voltages. The second stage is a soft switching power supply having good load regulation from approximately 40 to approximately 175 volts. An intermediate high voltage of the first stage supplies the input to the second stage, thereby achieving extremely good line regulation and low regulation.
Claims17
A power supply for a multi-mode device comprising:
- a power factor corrector stage for providing a plurality of first stage voltages including a load regulator stage input voltage, the power factor corrector stage including a first feedback controller for regulating ones of the first stage voltages;
- and
- a load regulator stage powered by the load regulator stage input voltage and operable to provide a plurality of second stage voltages, the load regulator stage including a second feedback controller for regulating ones of the second stage voltages,
- wherein at least one of the first stage voltages supplies a voltage corresponding to a selected device mode and at least one of the second stage voltages supplies a voltage corresponding to another selected device mode.
A multi-mode monitor comprising a power supply,
- the power supply including:
- a power factor corrector stage for providing a plurality of first stage voltages including a load regulator stage input voltage wherein at least one of the first stage voltages supply voltage requirements lower than the load regulator stage input voltage for the monitor, the voltage requirements including a suspend mode voltage;
- a load regulator stage responsive to the load regulator stage input voltage and operable to provide a plurality of second stage voltages including a run mode voltage for the monitor;
- and
- a mode detector for selecting a monitor mode.
A method for powering a multi-mode monitor comprising the steps of:
- providing a power supply having a first stage and a second stage;
- in the first stage, supplying a plurality of power factor corrected output voltages, including a second stage input voltage and at least one monitor supply voltage corresponding to a mode of monitor operation;
- in the second stage, powering the second stage with the second stage input voltage and supplying at least another monitor supply voltage corresponding to another mode of monitor operation, wherein the at least another monitor supply voltage is turned off when the monitor is not in the corresponding mode;
- and
- selecting one of the corresponding monitor modes of operation.
Dependencies are inferred from the claim text.