DRIVING CIRCUIT FOR A LIGHT EMITTING COMPONENT AND CONTROL CIRCUIT THEREOF
First Claim
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1. A driving circuit for driving light emission of a light emitting component, comprising:
- a control circuit disposed to receive a sense voltage associated with a direct-current (DC) source voltage, and configured to generate a control signal having a duty cycle that varies with the sense voltage in a monotonically increasing manner; and
a boost converter circuit disposed to receive the DC source voltage and the control signal, and configured to provide a driving current for driving light emission of the light emitting component, the driving current having a magnitude positively correlated to the duty cycle of the control signal.
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Abstract
A driving circuit includes a control circuit and a boost converter circuit. The control circuit receives a sense voltage associated with a direct-current (DC) source voltage, and generates a control signal with a duty cycle that varies with the sense voltage in a monotonically increasing manner. The boost converter circuit receives the DC source voltage and the control signal, thereby providing a driving current for driving light emission of a light emitting component. The driving current has a magnitude positively correlated to the duty cycle of the control signal.
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Citations
9 Claims
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1. A driving circuit for driving light emission of a light emitting component, comprising:
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a control circuit disposed to receive a sense voltage associated with a direct-current (DC) source voltage, and configured to generate a control signal having a duty cycle that varies with the sense voltage in a monotonically increasing manner; and a boost converter circuit disposed to receive the DC source voltage and the control signal, and configured to provide a driving current for driving light emission of the light emitting component, the driving current having a magnitude positively correlated to the duty cycle of the control signal. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A control circuit for generating a control signal to a boost converter circuit to control light emission of a light emitting component, the boost converter circuit being configured to provide to the light emitting component a driving current with a magnitude associated with a duty cycle of the control signal, said control circuit comprising:
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a reference circuit disposed to receive a sense voltage, and configured to generate a reference voltage having a first preset voltage magnitude when the sense voltage is lower than the first preset voltage magnitude, and having a second preset voltage magnitude higher than the first preset voltage magnitude when the sense voltage is higher than the second preset voltage magnitude; an oscillator circuit configured to generate an oscillating signal having a predetermined frequency and a triangular waveform; and a pulse width modulation circuit configured to receive the reference voltage from said reference circuit and the oscillating signal from said oscillator circuit, to thereby generate the control signal by pulse width modulation, the control signal having a frequency associated with the oscillating signal, the duty cycle of the control signal being associated with the oscillating signal and the reference voltage, and varying with the sense voltage in a monotonically increasing manner. - View Dependent Claims (9)
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Specification