Electronic control gears for LED light engine and application thereof
First Claim
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1. An electronic control gear for LED light engine comprising:
- a rectifier for connecting to an external AC voltage source;
a current regulator connecting to the rectifier; and
a switch regulator chain having a plurality of switch regulators, the switch regulator chain connected in series with the current regulator and connected in parallel with an external LED array chain, the external LED array chain having a plurality of LED array segments, each of the switch regulators connected in parallel with a corresponding LED array segment except for a last segment in the external LED array chain, each of the switch regulators comprising a bypass switch and a detector, each of the detectors having a first terminal, a second terminal, and a third terminal, any two of the first terminals, the second terminals, and the third terminals connected to different nodes, a present detector receiving a voltage sense signal or a current sense signal, and a present bypass switch regulates LED current flowing through a downstream LED array segment at a preset constant current level, wherein each of the bypass switches is a normally closed electronic switch, a channel of each bypass switch is normally closed when the control voltage is absent or zero, channels of any adjacent two among the bypass switches are directly connected to each other, whereinwhen an input voltage is insufficient to forward-bias the downstream LED array segment, the present bypass switch remains in on state so that a channel of the present bypass switch shorts out the present LED array segment;
when the input voltage is high enough to forward-bias the downstream LED array segment but fails to forward-bias the present LED array segment, the present bypass switch regulates LED current flowing through the downstream LED array segment at a preset constant current level; and
when the input voltage is high enough to forward-bias the present LED array segment, the present bypass switch is shut off to free up the present LED array segment.
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Abstract
Disclosed are electronic control gears for LED light engines able to improve power factor by way of gearing up or down the LED current and the AC input current in response to and in synchronization with the AC input voltage. Moreover, the disclosed electronic control gears could further reduce flicker phenomenon and total harmonic distortion when used in collocation with disclosed valley fillers, filling the LED current valleys only during the dead time, and in conjunction with disclosed dummy loads, ramping up or down the AC input current only during the dead time.
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Citations
18 Claims
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1. An electronic control gear for LED light engine comprising:
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a rectifier for connecting to an external AC voltage source; a current regulator connecting to the rectifier; and a switch regulator chain having a plurality of switch regulators, the switch regulator chain connected in series with the current regulator and connected in parallel with an external LED array chain, the external LED array chain having a plurality of LED array segments, each of the switch regulators connected in parallel with a corresponding LED array segment except for a last segment in the external LED array chain, each of the switch regulators comprising a bypass switch and a detector, each of the detectors having a first terminal, a second terminal, and a third terminal, any two of the first terminals, the second terminals, and the third terminals connected to different nodes, a present detector receiving a voltage sense signal or a current sense signal, and a present bypass switch regulates LED current flowing through a downstream LED array segment at a preset constant current level, wherein each of the bypass switches is a normally closed electronic switch, a channel of each bypass switch is normally closed when the control voltage is absent or zero, channels of any adjacent two among the bypass switches are directly connected to each other, wherein when an input voltage is insufficient to forward-bias the downstream LED array segment, the present bypass switch remains in on state so that a channel of the present bypass switch shorts out the present LED array segment; when the input voltage is high enough to forward-bias the downstream LED array segment but fails to forward-bias the present LED array segment, the present bypass switch regulates LED current flowing through the downstream LED array segment at a preset constant current level; and when the input voltage is high enough to forward-bias the present LED array segment, the present bypass switch is shut off to free up the present LED array segment. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. An integrated circuit of an electronic control gear for LED light engine, comprising:
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a rectifier used for connecting an external AC power source; a current regulator connecting to the rectifier; and a switch regulator chain having a plurality of switch regulators connected in series, the switch regulator chain connected in series with the current regulator and in parallel with an external LED array chain, the external LED array chain having a plurality of LED array segments connected in series, each of the switch regulators is connected in parallel with a corresponding one of the LED array segments except for a last segment in the external LED array chain, each of the switch regulators having a bypass switch and a detector, each of the detectors having a first terminal, a second terminal, and a third terminal, any two of the first terminals, the second terminals, and the third terminals connected to different nodes, the detector detecting a downstream LED array segment to switch a present bypass switch, and the bypass switches being normally closed electronic switches, the bypass switches being normally closed when the control voltage being absent or zero, channels of any adjacent two among the bypass switches are directly connected to each other, wherein when an input voltage is insufficient to forward-bias the downstream LED array segment, the present bypass switch remains in on state so that a channel of the present bypass switch shorts out the present LED array segment; when the input voltage is high enough to forward-bias the downstream LED array segment but fails to forward-bias the present LED array segment, the present bypass switch regulates LED current flowing through the downstream LED array segment at a preset constant current level; and when the input voltage is high enough to forward-bias the present LED array segment, the present bypass switch is shut off to free up the present LED array segment. - View Dependent Claims (16, 17, 18)
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Specification