Light adjustment circuit for alternating-current light emitting diodes (AC-LED's)
First Claim
1. A light adjustment circuit for alternating-current light emitting diodes (AC-LED'"'"'s), the light adjustment circuit being connected to an AC power supply and a plurality of AC-LED'"'"'s, the light adjustment circuit comprising:
- a light adjustment unit, modulating AC power from the AC power supply while providing the plurality of AC-LED'"'"'s with the modulated AC power; and
a pulse width modulation (PWM) control circuit, modulating an external voltage signal in correspondence to variation in input AC power to enable each of the AC-LED'"'"'s to achieve a predetermined brightness;
wherein the AC-LED'"'"'s are turned off by modulating the external voltage signal to prevent the AC-LED'"'"'s from being burnt out when the input AC power is too high.
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Accused Products
Abstract
A light adjustment circuit for alternating-current light emitting diodes (AC-LED'"'"'s) connected to an AC power supply and a plurality of AC-LED'"'"'s comprises: a light adjustment unit, being capable of modulating AC power from the AC power supply while providing the plurality of AC-LED'"'"'s with the modulated AC power; and a pulse width modulation (PWM) control circuit, being capable of modulating an external voltage signal in correspondence to variation in input AC power to enable each of the AC-LED'"'"'s to achieve a predetermined brightness; wherein the AC-LED'"'"'s are turned off by modulating the external voltage signal to prevent the AC-LED'"'"'s from being burnt out when the input AC power is too high.
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Citations
10 Claims
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1. A light adjustment circuit for alternating-current light emitting diodes (AC-LED'"'"'s), the light adjustment circuit being connected to an AC power supply and a plurality of AC-LED'"'"'s, the light adjustment circuit comprising:
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a light adjustment unit, modulating AC power from the AC power supply while providing the plurality of AC-LED'"'"'s with the modulated AC power; and a pulse width modulation (PWM) control circuit, modulating an external voltage signal in correspondence to variation in input AC power to enable each of the AC-LED'"'"'s to achieve a predetermined brightness; wherein the AC-LED'"'"'s are turned off by modulating the external voltage signal to prevent the AC-LED'"'"'s from being burnt out when the input AC power is too high. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification