Light emitting diode driving circuit and controller thereof
First Claim
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1. A Light Emitting Diode (LED) driving circuit, comprising:
- a conversion circuit, coupled to an input power source, for converting an input from the input power source into a direct current (DC) output signal to drive an LED module;
at least one current control unit, each of the current control units having a control pin, a first input/output (I/O) pin, and a second I/O pin, and the first I/O pin being coupled to the LED module;
at least one current detection unit, each of the current detection units being coupled to the second I/O pin of the respective current control unit to generate at least one detection signal; and
a driving control unit, coupled to the control pin and the first I/O pin of the current control unit as well as the current detection unit, adjusting voltage level of the control pin of the current control unit based on the detection signal from the current detection unit to stabilize current flowing through the LED module around a preset current value;
wherein, in case voltage level of one of the first I/O pins being higher than a first preset level, the driving control unit cuts off the respective current control unit.
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Abstract
A light emitting diode driving circuit comprising: a current control unit, a current detection unit, and a driving control unit. The current control unit connects to the current detection unit and comprises a control end, a first input/output end, and a second input/output end to individually produce an electric potential detection signal. The light emitting diode driving circuit determines whether driving the light emitting diode is unusual or not according to the electric potential detection signals to decide to start a protect mechanism. Furthermore, the present invention can receive any types of dimming signals to adjust the light of the light emitting diode.
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Citations
29 Claims
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1. A Light Emitting Diode (LED) driving circuit, comprising:
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a conversion circuit, coupled to an input power source, for converting an input from the input power source into a direct current (DC) output signal to drive an LED module; at least one current control unit, each of the current control units having a control pin, a first input/output (I/O) pin, and a second I/O pin, and the first I/O pin being coupled to the LED module; at least one current detection unit, each of the current detection units being coupled to the second I/O pin of the respective current control unit to generate at least one detection signal; and a driving control unit, coupled to the control pin and the first I/O pin of the current control unit as well as the current detection unit, adjusting voltage level of the control pin of the current control unit based on the detection signal from the current detection unit to stabilize current flowing through the LED module around a preset current value; wherein, in case voltage level of one of the first I/O pins being higher than a first preset level, the driving control unit cuts off the respective current control unit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A LED driving circuit, comprising:
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a conversion circuit, coupled to an input power source, for converting an input from the input power source into a DC output signal to drive an LED module; at least one current control unit, each of the current control units having a control pin, a first I/O pin, and a second I/O pin, and the first I/O pin being coupled to the LED module; at least one current detection unit, each of the current detection units being coupled to the second I/O pin of the respective current control unit to generate at least one detection signal; and a driving control unit, which is coupled to the control pin and the first I/O pin of the current control unit as well as to the current detection unit, adjusting voltage level of the control pin of the current control unit based on the at least one detection signal from the at least one current detection unit to stabilize current flowing through the LED module around a preset current value, wherein the driving control unit generates a fault signal as voltage level of one of the first I/O pins higher than a first preset level. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. A LED driving circuit controller, utilized to control an LED driving circuit for driving at least a first LED module, comprising:
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a first current adjusting unit, generating a first current adjusting signal according to a first current detection signal indicating magnitude of current flowing through a first LED module to control a first power switch connected in series to the first LED module so as to have voltage level of the first current detection signal stabilized around a first preset voltage value; and a signal processing unit, detecting a voltage signal from a first coupling point between the first power switch and the first LED module, receiving the first current detection signal, and generating a fault signal as either voltage level of the first current detection signal lower than a first preset level over a preset period of time or voltage level of the voltage signal from the first coupling point higher than a second preset level. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29)
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Specification