POWER OPTIMIZATION FOR LINEAR REGULATOR
First Claim
1. A power supply, comprising:
- a power converter configured to convert an input voltage to a target output DC voltage in response to a feedback signal, the feedback signal having a value;
a regulator coupled to the power converter and configured to generate an output power status signal, which maybe in one of two states depending whether an output current from the regulator is above or below a target current over a preset time duration; and
a control circuit coupled to the power converter and to the regulator and configured to increment or decrement the value of the feedback signal depending on the state of the power status signal.
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Accused Products
Abstract
A power supply includes a power converter configured to convert an input voltage to a target output DC voltage in response to a feedback signal, the feedback signal having a value. The power supply also includes a regulator coupled to the power converter and configured to generate an output power status signal, which maybe in one of two states depending whether an output current from the regulator is above or below a target current over a preset time duration. Further, a control circuit is coupled to the power converter and to the regulator and configured to increment or decrement the value of the feedback signal depending on the state of the power status signal.
18 Citations
21 Claims
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1. A power supply, comprising:
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a power converter configured to convert an input voltage to a target output DC voltage in response to a feedback signal, the feedback signal having a value; a regulator coupled to the power converter and configured to generate an output power status signal, which maybe in one of two states depending whether an output current from the regulator is above or below a target current over a preset time duration; and a control circuit coupled to the power converter and to the regulator and configured to increment or decrement the value of the feedback signal depending on the state of the power status signal. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A power supply for driving a plurality of LED (light-emitting diode) strings, the power supply comprising:
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a power converter, including; a power input node coupled to an input voltage; an output node coupled to a first end of each of the plurality of LED strings; and a feedback node for receiving a feedback signal from the output node; wherein the power converter is configured to convert the input voltage to a target output DC voltage in response to the feedback signal; a multi-channel regulator circuit coupled to the power converter and the plurality of LED strings, the regulator circuit including a plurality of channels; wherein each channel is coupled to a second end of a respective one of the LED strings for regulating a current in the LED string in response to a PWM (pulse mode modulation) control signal, the PWM control signal including an on-duration and an off-duration in each PWM switching cycle; wherein the regulator circuit is configured to provide an output power status signal that is either in a first state or a second state; wherein, the output power status signal is set in the first state if the current in any one of the LED strings is above a target current value for that LED string during the PWM on-duration in the PWM switching cycle, and the output power status signal is set in the second state if the current in that LED string is below the target current value for that LED string; and a microcontroller coupled to the power converter and the regulator, the microcontroller including a processor and is configured to monitor the output power status signal for a selected period of time, and to increment or decrement the feedback signal in response to the output power status signal, thereby to enable the power converter to reduce or increase the output DC voltage. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15)
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16. An integrated linear regulator for regulating current flow in an LED (light emitting diode) load having one or more LED strings, the integrated linear regulator comprising:
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a power terminal for receiving a DC power supply, the DC power supply also coupled to a first end of the one or more LED strings to provide power for the LED strings; one or more channels for regulating a current in each of the one or more LED strings; an input terminal for each channel for receiving an input signal; an output terminal for each channel for coupling to a second end of an LED string; a status terminal for providing an output power status signal; wherein each channel includes; a control circuit coupled to the input terminal and configured to receive the input signal and to provide a PWM (pulse mode modulation) control signal; a constant-current regulator coupled to the control circuit and the output terminal for regulating a current in the LED string in response to a PWM control signal, the PWM control signal including an on-duration and an off-duration in each PWM switching cycle; wherein the integrated linear regulator is configured to provide the output power status signal that is either in a first state or a second state; wherein, during the PWM on-duration in each PWM switching cycle, the output power status signal is in the first state if the current in any one of the LED strings is above a target current in that LED string, and the output power status signal is in the second state if the current in that LED string is below the target current in that LED string. - View Dependent Claims (17, 18, 19, 20, 21)
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Specification