DC to DC conversion circuit with variable output voltage
AssigneeAu Optronics Corporation
InventorsYa-yun Yu, Yueh-bao Lee, Jian-Shen Li
Life of this patent
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Abstract
The present invention provides a DC to DC conversion circuit, comprising a DC power supply, a DC to DC converter, a power management IC and a load, wherein the load may be a backlight source of a liquid crystal display. The power management IC controls the DC to DC converter to convert a DC voltage supplied by the DC power supply to an output voltage of the DC to DC converter, which is supplied to the load. The power management IC is capable of controlling the DC to DC converter to adjust the output voltage to a minimum voltage actually needed by the load according to the variation of the minimum voltage which is actually needed by the load.
Claims19
A DC to DC conversion circuit comprising:
- a load;
- a DC to DC converter for converting a DC voltage supplied by a DC power supply to an output voltage supplied to the load;
- a variable resistance circuit for outputting a feedback voltage in response to the equivalent resistance of the variable resistance circuit;
- a controller for adjusting the equivalent resistance of the variable resistance circuit in response to a variation of a remnant voltage of the load so as to adjust the feedback voltage of the variable resistance circuit in response to the equivalent resistance of the variable resistance circuit;
- and
- a power management IC for controlling the DC to DC converter to supply the output voltage in response to the feedback voltage of the variable resistance circuit.
A DC to DC conversion circuit comprising:
- a load;
- a resistive device;
- a DC to DC converter for converting a DC voltage supplied by a DC power supply to an output voltage supplied to the load;
- a voltage controlling circuit for adjusting a feedback voltage of the resistive device in response to a remnant voltage of the load;
- and
- a power management IC for controlling the DC to DC converter to supply the output voltage in response to the feedback voltage of the resistive device.
Dependencies are inferred from the claim text.