Constant current controller with selectable gain
First Claim
1. A method comprising:
- receiving a sense signal at an input node of a switching power converter;
using a selectable gain value to generate a duty cycle modulated control signal to control current supplied to a load, wherein the gain value is proportional to the sense signal and the current supplied to the load; and
controlling the current supplied to the load using the duty cycle modulated control signal.
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Accused Products
Abstract
A power distribution system includes a selectable gain value to generate a duty cycle modulated control signal to control current supplied to a load. In at least one embodiment, the power distribution system includes a controller and a switch, and the controller generates the duty cycle modulated control signal to control conductivity of the switch. The duty cycle modulated control signal has a period and a pulse width. In at least one embodiment, the controller determines the period of the control signal as a function of a peak allowable link current value (also referred to as a peak allowable output current value) of a switching power converter, an inductor flyback time of the switching power converter, and the gain value. The link current provides current to a load, such as a lighting system that includes light emitting diodes.
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Citations
23 Claims
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1. A method comprising:
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receiving a sense signal at an input node of a switching power converter; using a selectable gain value to generate a duty cycle modulated control signal to control current supplied to a load, wherein the gain value is proportional to the sense signal and the current supplied to the load; and controlling the current supplied to the load using the duty cycle modulated control signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A system comprising:
a controller to generate a control signal to control current supplied to a load, wherein the controller includes an input node to receive a sense signal at an input node of a switching power converter, and the controller is configured to; use a selectable gain value to generate a duty cycle modulated control signal to control current supplied to the load, wherein the gain value is proportional to the sense signal of switching power converter controller and the current supplied to the load; and control the current supplied to the load using the duty cycle modulated control signal. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. An apparatus comprising:
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a switching power converter; a load, coupled to the switching power converter, wherein the load includes one or more light emitting diodes; and a controller, coupled to the switching power converter, to generate a control signal to control the switching power converter and control current supplied to the load, wherein the controller includes an input node to receive a sense signal at an input node of a switching power converter, and the controller is configured to; use a selectable gain value to generate a duty cycle modulated control signal to control current supplied to the load, wherein the gain value is proportional to the sense signal of switching power converter controller and the current supplied to the load; and control the current to supplied to the load using the duty cycle modulated control signal.
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23. A system comprising:
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means for receiving a sense signal at an input node of a switching power converter; means for using a selectable gain value to generate a duty cycle modulated control signal to control current supplied to a load, wherein the gain value is proportional to the sense signal and the current supplied to the load; and means for controlling the current supplied to the load using the duty cycle modulated control signal.
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Specification