Illumination device and LED dimming circuit thereof
First Claim
1. A light-emitting diode (LED) dimming circuit, comprising:
- a power converting module for receiving a mains supply and generating a driving voltage to drive a LED;
a sensing unit for converting a driving current flowing through the LED to a sensing voltage signal; and
a dimming module, comprising;
an amplifier for amplifying the sensing voltage signal to output an amplified sensing voltage signal;
an input interface for receiving a dimming control signal inputted from external;
a filter for converting the dimming control signal into a DC reference voltage signal;
a dimming signal generator for outputting a first feedback signal based on the amplified sensing voltage signal and the DC reference voltage signal, wherein the dimming signal generator is a comparator;
when an electric potential of the DC reference voltage signal is higher than an electric potential of the amplified sensing voltage signal, an electric potential of the first feedback signal outputted by the comparator is increased;
when an electric potential of the DC reference voltage signal is lower than an electric potential of the amplified sensing voltage signal, the electric potential of the first feedback signal outputted by the comparator is reduced; and
an isolating unit electrically connected between the dimming signal generator and the power converting module, and configured for receiving the first feedback signal and outputting a second feedback signal to the power converting module, thereby feedback-controlling the driving current,wherein the comparator has a first input directly connected to the filter and configured to receive the DC reference voltage signal from the filter, a second input directly connected to the amplifier and configured to receive the amplified sensing voltage signal, and an output directly connected to the isolating unit and configured to output the first feedback signal to the isolating unit.
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Accused Products
Abstract
An illumination device includes a light-emitting diode (LED) lamp and a LED dimming circuit. The LED dimming circuit includes a power converting module, a sensing unit and a dimming module. The power converting module is used to generate a driving voltage to drive the LED lamp. The sensing unit is used to generate a sensing voltage signal. The dimming module includes an input interface, a dimming signal generator and an isolating unit. The input interface is used to receive a dimming control signal. The dimming signal generator is used to output a first feedback signal based on the sensing voltage signal and the dimming control signal. The isolating unit is used to receive the first feedback signal and output a second feedback signal to the power converting module so as to control a driving current.
20 Citations
21 Claims
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1. A light-emitting diode (LED) dimming circuit, comprising:
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a power converting module for receiving a mains supply and generating a driving voltage to drive a LED; a sensing unit for converting a driving current flowing through the LED to a sensing voltage signal; and a dimming module, comprising; an amplifier for amplifying the sensing voltage signal to output an amplified sensing voltage signal; an input interface for receiving a dimming control signal inputted from external; a filter for converting the dimming control signal into a DC reference voltage signal; a dimming signal generator for outputting a first feedback signal based on the amplified sensing voltage signal and the DC reference voltage signal, wherein the dimming signal generator is a comparator;
when an electric potential of the DC reference voltage signal is higher than an electric potential of the amplified sensing voltage signal, an electric potential of the first feedback signal outputted by the comparator is increased;
when an electric potential of the DC reference voltage signal is lower than an electric potential of the amplified sensing voltage signal, the electric potential of the first feedback signal outputted by the comparator is reduced; andan isolating unit electrically connected between the dimming signal generator and the power converting module, and configured for receiving the first feedback signal and outputting a second feedback signal to the power converting module, thereby feedback-controlling the driving current, wherein the comparator has a first input directly connected to the filter and configured to receive the DC reference voltage signal from the filter, a second input directly connected to the amplifier and configured to receive the amplified sensing voltage signal, and an output directly connected to the isolating unit and configured to output the first feedback signal to the isolating unit. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An illumination device, comprising:
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a LED dimming circuit, comprising; a power converting module for receiving a mains supply and generating a driving voltage to drive a LED; a sensing unit for converting a driving current flowing through the LED to a sensing voltage signal; a dimming module, comprising; an amplifier for amplifying the sensing voltage signal to output an amplified sensing voltage signal; an input interface for receiving a dimming control signal inputted from external; a filter for converting the dimming control signal into a DC reference voltage signal, a dimming signal generator for outputting a first feedback signal based on the amplified sensing voltage signal and the DC reference voltage signal, wherein the dimming signal generator is a comparator;
when an electric potential of the DC reference voltage signal is higher than an electric potential of the amplified sensing voltage signal, an electric potential of the first feedback signal outputted by the comparator is increased;
when an electric potential of the DC reference voltage signal is lower than an electric potential of the amplified sensing voltage signal, the electric potential of the first feedback signal outputted by the comparator is reduced; andan isolating unit electrically connected between the dimming signal generator and the power converting module, and configured for receiving the first feedback signal and outputting a second feedback signal to the power converting module, thereby feedback-controlling the driving current, wherein the comparator has a first input directly connected to the filter and configured to receive the DC reference voltage signal from the filter, a second input directly connected to the amplifier and configured to receive the amplified sensing voltage signal, and an output directly connected to the isolating unit and configured to output the first feedback signal to the isolating unit; a LED lamp electrically connected to the power converting module of the LED dimming circuit. - View Dependent Claims (8, 9, 10, 11)
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12. A LED dimming circuit, comprising:
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a power converting module electrically connected to a LED, and the power converting module for receiving a mains supply and generating a driving voltage to drive the LED; a sensing unit electrically connected to the LED, and the sensing unit for converting a driving current flowing through the LED to a sensing voltage signal; an amplifier with an input end and an output end, the input end of the amplifier electrically connected to the sensing unit, the amplifier for amplifying the sensing voltage signal to output an amplified sensing voltage signal; an input interface; a filter with an input end and an output end, the input end of the filter electrically connected to the input interface, the filter for converting the dimming control signal into a DC reference voltage signal; a dimming signal generator with two input ends and an output end, and one of the two input ends of the dimming signal generator directly electrically connected to the output end of the amplifier, and the other of the two input ends of the dimming signal generator electrically connected to the output end of the filter, wherein the dimming signal generator is a comparator;
when an electric potential of the DC reference voltage signal is higher than an electric potential of the amplified sensing voltage signal, an electric potential of an first feedback signal outputted by the comparator is increased;
when an electric potential of the DC reference voltage signal is lower than an electric potential of the amplified sensing voltage signal, the electric potential of the first feedback signal outputted by the comparator is reduced; andan isolating unit with an input end and an output end, and the input end of the isolating unit electrically connected to the output end of the dimming signal generator, and the output end of the isolating unit electrically connected to the power converting module, wherein the isolating unit is electrically connected between the dimming signal generator and the power converting module, wherein the comparator has a first input directly connected to the filter and configured to receive the DC reference voltage signal from the filter, a second input directly connected to the amplifier and configured to receive the amplified sensing voltage signal, and an output directly connected to the isolating unit and configured to output the first feedback signal to the isolating unit. - View Dependent Claims (13, 14, 15, 16)
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17. An illumination device, comprising:
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a LED dimming circuit, comprising; a power converting module electrically connected to a LED, and the power converting module for receiving a mains supply and generating a driving voltage to drive the LED; a sensing unit electrically connected to the LED, and the sensing unit for converting a driving current flowing through the LED to a sensing voltage signal; an amplifier with an input end and an output end, the input end of the amplifier electrically connected to the sensing unit, the amplifier for amplifying the sensing voltage signal to output an amplified sensing voltage signal; an input interface; a filter with an input end and an output end, the input end of the filter electrically connected to the input interface, the filter for converting the dimming control signal into a DC reference voltage signal; a dimming signal generator with two input ends and an output end, and one of the two input ends of the dimming signal generator directly electrically connected to the output end of the amplifier, and the other of the two input ends of the dimming signal generator electrically connected to the output end of the filter, wherein the dimming signal generator is a comparator;
when an electric potential of the DC reference voltage signal is higher than an electric potential of the amplified sensing voltage signal, an electric potential of an first feedback signal outputted by the comparator is increased;
when an electric potential of the DC reference voltage signal is lower than an electric potential of the amplified sensing voltage signal, the electric potential of the first feedback signal outputted by the comparator is reduced; andan isolating unit with an input end and an output end, and the input end of the isolating unit electrically connected to the output end of the dimming signal generator, and the output end of the isolating unit electrically connected to the power converting module, wherein the isolating unit is electrically connected between the dimming signal generator and the power converting module, wherein the comparator has a first input directly connected to the filter and configured to receive the DC reference voltage signal from the filter, a second input directly connected to the amplifier and configured to receive the amplified sensing voltage signal, and an output directly connected to the isolating unit and configured to output the first feedback signal to the isolating unit; and a LED lamp electrically connected to the power converting module of the LED dimming circuit. - View Dependent Claims (18, 19, 20, 21)
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Specification