Power supply switching circuit for a halogen lamp
AssigneeMarvell International Ltd.
InventorsHubertus Notohamiprodjo, Liang Chen
Life of this patent
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Abstract
A power supply and methods are provided. In one implementation, the power supply includes a switching circuit and a converter. The switching circuit includes a first transistor and a second transistor, and the converter includes a capacitor and an inductor. The switching circuit alternately switches an input voltage to the converter. The power supply further includes a controller operable to adjust a switching frequency of the first transistor and the second transistor to substantially match a resonant frequency of the capacitor and the inductor.
Claims20
A device comprising:
- a controller to control a DC-DC (direct current) converter, the controller including:
- a detector to receive a voltage feedback signal, and to detect a peak voltage associated with the voltage feedback signal;
- a dimming voltage reference to receive a dimming control voltage, and to generate a reference voltage;
- an operational amplifier to compare the peak voltage with the reference voltage;
- and
- a frequency control circuit to generate a control signal based on the comparison to control the DC-DC converter.
A system comprising:
- a switching circuit to couple a DC input voltage to a converter;
- and
- a controller to control the switching circuit such that the converter converts the DC input voltage into a DC output voltage, the controller including:
- a detector to receive a voltage feedback signal, and to detect a peak voltage associated with the voltage feedback signal;
- a dimming voltage reference to receive a dimming control voltage, and to generate a reference voltage;
- an operational amplifier to compare the peak voltage with the reference voltage;
- and
- a frequency control circuit to generate a first signal and a second signal based on the comparison to control the DC output voltage.
A method comprising:
- receiving a voltage feedback signal;
- identifying a peak voltage associated with the voltage feedback signal;
- receiving a dimming control voltage;
- generating a reference voltage based on the dimming control voltage;
- comparing the peak voltage with the reference voltage;
- and
- generating a control signal to control a DC output voltage of a DC-DC converter.
Dependencies are inferred from the claim text.