Back to results
US 7,924,584 B1Granted
Power supply switching circuit for a halogen lamp
AssigneeMarvell International Ltd.
InventorsHubertus Notohamiprodjo, Liang Chen
Life of this patent
Estimating the term…
Abstract
A power supply and methods are provided. The power supply includes a bi-forward converter and a feed forward circuit. The bi-forward converter is operable to convert an input voltage into an output voltage. The feed forward circuit is operable to detect a peak voltage associated with the input voltage, and the bi-forward converter is further operable to adjust the output voltage responsive to the peak voltage detected by the feed forward circuit.
Claims41
A power supply comprising:
- a bi-forward converter operable to convert an alternating current (AC) input voltage into an AC output voltage;
- a controller directly coupled with the bi-forward converter and operable to control a voltage level of the AC output voltage;
- a feed forward circuit operable to detect a peak AC voltage associated with the AC input voltage, the feed forward circuit including:
- a voltage divider operable to divide the AC input voltage, and
- a peak detector operable to detect a peak AC voltage associated with the divided AC input voltage and send the detected peak AC voltage to the controller;
- and
- a dimmer and feedback circuit operable to provide a feedback dimming control voltage to the controller,
- wherein the controller is further operable to adjust the AC output voltage of the bi-forward converter responsive to the peak AC voltage detected by the feed forward circuit and the feedback dimming control voltage provided by the dimmer and feedback circuit such that the AC output voltage remains substantially constant over a range of detected peak voltages including the detected peak AC voltage.
5 more elements
A power supply comprising:
- a bi-forward converter operable to convert an alternating current (AC) input voltage into an AC output voltage;
- a feed forward circuit operable to detect a peak AC voltage associated with the AC input voltage;
- and
- a controller directly coupled to the bi-forward converter and operable to generate a control voltage based on the detected peak AC voltage to control the bi-forward converter such that the AC output voltage remains substantially constant over a range of detected peak voltages including the detected peak AC voltage,
- wherein the bi-forward converter is further operable to adjust the AC output voltage responsive to the control voltage;
- and
- wherein the feed forward circuit includes:
- a voltage divider operable to divide the AC input voltage, and
- a peak detector operable to detect the peak AC voltage associated with the divided AC input voltage and send the detected peak AC voltage to the controller.
6 more elements
A method comprising:
- converting, by a bi-forward converter, an alternating current (AC) input voltage into an AC output voltage;
- detecting, by a feed forward circuit, a peak AC voltage associated with the AC input voltage including:
- dividing, by a voltage divider, the AC input voltage, and
- detecting, by a peak detector, the peak AC voltage associated with the divided AC input voltage, and
- sending, by the peak detector, the detected peak AC voltage to a controller;
- generating, by the controller, a first control voltage responsive to the detected peak voltage that adjusts the AC output voltage such that the AC output voltage remains substantially constant over a range of detected voltage peak values;
- and
- adjusting, by the bi-forward converter, the AC output voltage responsive to the first control voltage.
5 more elements
A power supply comprising:
- means for converting an alternating current (AC) input voltage into an AC output voltage;
- means for controlling directly coupled to the means for converting and operable to control a voltage level of the AC output voltage;
- means for detecting a peak AC voltage associated with the AC input voltage;
- and
- means for providing a feedback dimming control voltage to the means for controlling, the means for providing including:
- means for filtering a feedback signal associated with the AC output voltage of the means for converting, and providing a filtered feedback signal,
- means for detecting a peak AC voltage associated with the filtered feedback signal, and
- means for generating the feedback dimming control voltage using the detected peak AC voltage associated with the filtered feedback signal including means for comparing the detected peak AC voltage associated with the filtered feedback signal with an adjustable voltage reference that corresponds with the AC output voltage of the means for converting,
- wherein the means for controlling includes means for adjusting the AC output voltage of the means for converting responsive to the peak AC voltage and the feedback dimming control voltage such that the AC output voltage remains substantially constant over a range of detected peak voltages including the detected peak AC voltage.
6 more elements
A power supply comprising:
- means for converting an alternating current (AC) input voltage into an AC output voltage;
- means for detecting a peak AC voltage associated with the AC input voltage;
- and
- means for generating a control voltage that adjusts the AC output voltage based on the peak AC voltage such that the AC output voltage remains substantially constant over a range of detected peak voltages including the detected peak AC voltage,
- wherein the means for converting further includes means for adjusting the AC output voltage responsive to the peak AC voltage detected by the means for detecting a peak AC voltage,
- wherein the means for detecting a peak AC voltage further includes:
- means for dividing the AC input voltage, and
- means for detecting the peak AC voltage associated with the divided AC input voltage and sending the detected peak AC voltage to the means for generating the control voltage.
5 more elements
Dependencies are inferred from the claim text.