Light emitting device power supply circuit, and light emitting device driver circuit and control method thereof
First Claim
1. A light emitting device driver circuit for driving a light emitting device circuit according to a rectified dimming signal, wherein the rectified dimming signal is generated from an AC input signal which passes through a tri-electrode AC switch (TRIAC) dimming circuit and a rectifier circuit, the light emitting device driver circuit comprising:
- a power stage circuit coupled between the rectifier circuit and the light emitting device circuit, the power stage circuit operating at least one power switch therein according to a switch control signal to generate a latching current for firing the TRIAC dimming circuit, wherein the latching current flows through the light emitting device circuit; and
a light emitting device control circuit coupled to the power stage circuit, the light emitting device control circuit generating the switch control signal according to a detection signal;
wherein the detection signal is generated according to the rectified dimming signal or a signal related to the rectified dimming signal, and the detection signal is generated when the rectified dimming signal changes from a neutral level to a predetermined level, and wherein the switch control signal turns ON the power switch continuously for a predetermined period.
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Accused Products
Abstract
The present invention discloses a light emitting device power supply circuit, a light emitting device driver circuit and a control method thereof. The light emitting device driver circuit is coupled to a tri-electrode AC switch (TRIAC) dimmer circuit, and it controls the brightness of a light emitting device circuit according a rectified dimming signal. The light emitting device driver circuit includes a power stage circuit and a light emitting device control circuit. The light emitting device control circuit generates a switch control signal. The power stage circuit operates at least one power switch thereof according to the switch control signal to generate a latching current for firing the TRIAC dimmer circuit, and the latching current is inputted to the light emitting device circuit.
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Citations
16 Claims
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1. A light emitting device driver circuit for driving a light emitting device circuit according to a rectified dimming signal, wherein the rectified dimming signal is generated from an AC input signal which passes through a tri-electrode AC switch (TRIAC) dimming circuit and a rectifier circuit, the light emitting device driver circuit comprising:
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a power stage circuit coupled between the rectifier circuit and the light emitting device circuit, the power stage circuit operating at least one power switch therein according to a switch control signal to generate a latching current for firing the TRIAC dimming circuit, wherein the latching current flows through the light emitting device circuit; and a light emitting device control circuit coupled to the power stage circuit, the light emitting device control circuit generating the switch control signal according to a detection signal; wherein the detection signal is generated according to the rectified dimming signal or a signal related to the rectified dimming signal, and the detection signal is generated when the rectified dimming signal changes from a neutral level to a predetermined level, and wherein the switch control signal turns ON the power switch continuously for a predetermined period.
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2. A light emitting device driver circuit for driving a light emitting device circuit according to a rectified dimming signal, wherein the rectified dimming signal is generated from an AC input signal which passes through a tri-electrode AC switch (TRIAC) dimming circuit and a rectifier circuit, the light emitting device driver circuit comprising:
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a power stage circuit coupled between the rectifier circuit and the light emitting device circuit, the power stage circuit operating at least one power switch therein according to a switch control signal to generate a latching current for firing the TRIAC dimming circuit, wherein the latching current flows through the light emitting device circuit; and a light emitting device control circuit coupled to the power stage circuit, the light emitting device control circuit generating the switch control signal according to a detection signal; wherein the detection signal is generated according to at least one method below; (1) by detecting the rectified dimming signal or a signal related to the rectified dimming signal, and the detection signal is generated when the rectified dimming signal is at a neutral level or below a predetermined level; (2) by detecting an input or an output current flowing through the power stage circuit or a signal related to the input or the output current, and the detection signal is generated when the input or the output current is zero; and (3) by generating the detection signal with a frequency corresponding to a frequency of the AC input signal or the rectified dimming signal. - View Dependent Claims (3, 4, 5, 6)
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7. A light emitting device control method, comprising:
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receiving a rectified dimming signal, which is generated from an AC input signal which passes through a tri-electrode AC switch (TRIAC) dimming circuit and a rectifier circuit; generating a switch control signal according to a detection signal; controlling at least one power switch of a power stage circuit according to the switch control signal to generate a latching current for firing the TRIAC dimming circuit; and inputting the latching current to the light emitting device; wherein the detection signal is generated according to the rectified dimming signal or a signal related to the rectified dimming signal, and the detection signal is generated when the rectified dimming signal changes from a neutral level to a predetermined level; and
the step of generating the latching current includes;
turning ON the power switch continuously for a predetermined period by the switch control signal according to the detection signal.
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8. A light emitting device control method, comprising:
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receiving a rectified dimming signal, which is generated from an AC input signal which passes through a tri-electrode AC switch (TRIAC) dimming circuit and a rectifier circuit; generating a switch control signal according to a detection signal; controlling at least one power switch of a power stage circuit according to the switch control signal to generate a latching current for firing the TRIAC dimming circuit; and inputting the latching current to the light emitting device; wherein the detection signal is generated according to at least one method below; (1) by detecting the rectified dimming signal or a signal related to the rectified dimming signal, and the detection signal is generated when the rectified dimming signal is at a neutral level or below a predetermined level; (2) by detecting an input or an output current flowing through the power stage circuit or a signal related to the input or the output current, and the detection signal is generated when the input or the output current is zero; and (3) by generating the detection signal with a frequency corresponding to a frequency of the AC input signal or the rectified dimming signal. - View Dependent Claims (9, 10)
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11. A light emitting device power supply circuit, comprising:
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a tri-electrode AC switch (TRIAC) dimming circuit for generating an AC dimming signal according to an AC input signal; a rectifier circuit for generating a rectified dimming signal according to the AC dimming signal; and a light emitting device driver circuit for driving a light emitting device circuit according to the rectified dimming signal, the light emitting device driver circuit including; a power stage circuit coupled between the rectifier circuit and the light emitting device circuit, the power stage circuit operating at least one power switch therein according to a switch control signal to generate a latching current for firing the TRIAC dimming circuit, wherein the latching current flows through the light emitting device circuit; and a light emitting device control circuit coupled to the power stage circuit, the light emitting device control circuit generating the switch control signal according to a detection signal; wherein the detection signal is generated according to the rectified dimming signal or a signal related to the rectified dimming signal, and the detection signal is generated when the rectified dimming signal changes from a neutral level to a predetermined level, and wherein the switch control signal turns ON the power switch continuously for a predetermined period.
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12. A light emitting device power supply circuit, comprising:
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a tri-electrode AC switch (TRIAC) dimming circuit for generating an AC dimming signal according to an AC input signal; a rectifier circuit for generating a rectified dimming signal according to the AC dimming signal; and a light emitting device driver circuit for driving a light emitting device circuit according to the rectified dimming signal, the light emitting device driver circuit including; a power stage circuit coupled between the rectifier circuit and the light emitting device circuit, the power stage circuit operating at least one power switch therein according to a switch control signal to generate a latching current for firing the TRIAC dimming circuit, wherein the latching current flows through the light emitting device circuit; and a light emitting device control circuit coupled to the power stage circuit, the light emitting device control circuit generating the switch control signal according to a detection signal; wherein the detection signal is generated according to at least one method listed below; (1) by detecting the rectified dimming signal or a signal related to the rectified dimming signal, and the detection signal is generated when the rectified dimming signal is at a neutral level or below a predetermined level; (2) by detecting an input or an output current flowing through the power stage circuit or a signal related to the input or the output current, and the detection signal is generated when the input or the output current is zero; and (3) by generating the detection signal with a frequency corresponding to a frequency of the AC input signal or the rectified dimming signal. - View Dependent Claims (13, 14, 15, 16)
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Specification