Apparatus and method of operation of a low-current LED lighting circuit
First Claim
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1. An LED lighting circuit comprising:
- a rectification circuit for converting an AC input power signal to a rectified DC power signal;
a peak current limiting circuit electrically coupled to the rectification circuit for providing a peak current limiting means from the voltage ripple of said rectified DC power signal, wherein said voltage ripple is intentionally unreduced, whose output creates a current source; and
an LED mesh circuit electrically coupled to the output of the peak current limiting circuit and receives said current source as an input;
wherein the AC input power range is between 50 VRMS, inclusive, and 350 VRMS, inclusive, with a maximum of 20% of the AC input power allocated to the peak current limiting circuit, with said current source equal to or less than 20 mA per LED.
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Abstract
An apparatus and method of operation of a low-current LED lighting circuit are disclosed. The invention utilizes high AC voltage input and unreduced voltage ripple component of the rectified DC power signal, which provides the ability to drive an LED load at high power factor at low current. The invention discloses both active and passive circuits to limit the peak current flowing to the LED and create a current source for the LED load. The proposed circuit increases reliability by optionally eliminating capacitor, inductor, and heatsink components while minimizing luminous flux fluctuations.
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Citations
18 Claims
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1. An LED lighting circuit comprising:
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a rectification circuit for converting an AC input power signal to a rectified DC power signal; a peak current limiting circuit electrically coupled to the rectification circuit for providing a peak current limiting means from the voltage ripple of said rectified DC power signal, wherein said voltage ripple is intentionally unreduced, whose output creates a current source; and an LED mesh circuit electrically coupled to the output of the peak current limiting circuit and receives said current source as an input; wherein the AC input power range is between 50 VRMS, inclusive, and 350 VRMS, inclusive, with a maximum of 20% of the AC input power allocated to the peak current limiting circuit, with said current source equal to or less than 20 mA per LED. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An LED lighting circuit comprising:
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a rectification circuit for converting an AC input power signal to a rectified DC power signal; a peak current limiting circuit electrically coupled to the rectification circuit for providing a peak current limiting means from the voltage ripple of said rectified DC power signal, wherein said voltage ripple is intentionally unreduced, whose output creates a current source; and an LED mesh circuit electrically coupled to the output of the peak current limiting circuit and receives said current source as an input; wherein said unreduced voltage ripple input to said peak current limiting circuit is allowed to vary, and at least one electrical characteristic of at least one of the LEDs in said LED mesh circuit is chosen such that variations in the luminous flux intensity are rendered unobservable to the human eye. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. A method of operating an LED lighting circuit, comprising the steps of:
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rectifying an AC power input signal to a rectified DC power signal; producing an intentionally unreduced voltage ripple from said rectified DC power signal; electrically coupling a peak current limiting circuit to the rectification circuit for providing a peak current limiting means from the voltage ripple of said rectified DC power signal, wherein said voltage ripple is intentionally unreduced, so that said unreduced voltage ripple input to said peak current limiting circuit is allowed to vary, and at least one electrical characteristic of at least one of the LEDs in said LED mesh circuit is chosen such that variations in the luminous flux intensity are rendered unobservable to the human eye, whose output creates a current source; and electrically coupling an LED mesh circuit to the output of the peak current limiting circuit and receiving said current source as an input. - View Dependent Claims (18)
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Specification