LED light string circuit having a plurality of short strings connected as long string
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A light string and current technology, applied in the direction of electric light circuit layout, electric light source, lighting device, etc., can solve the problem that the light output of LED light string cannot be adjusted, and achieve the effect of avoiding flickering, prolonging the average lifespan and reducing EMI.
Inactive Publication Date: 2011-09-21
ACTIVE SEMI SHANGHAI +1
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Moreover, the light output of the LED light string ca
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[0036] image 3 It is a schematic circuit diagram of the AC LED light string circuit 50 of the first embodiment. The AC LED lamp string circuit 50 includes a full-wave rectifier 51 , an integrated circuit (also called an integrated control circuit) 52 for automatically adjusting the voltage of the LED lamp circuit, and an LED lamp string composed of serially connected LEDs. A full wave rectifier 51 is connected to power input terminals 53 and 54 as shown. The power input terminals 53 and 54 can be connected with AC or DC voltage.
[0037] The long string of LEDs has a first end point 55 and a second end point 56, and there are seven LED lamp parts 57-62 in sequence between the two ends, and each LED light part described here is a short LED string. The nodes between the two LED short strings in the figure are technically interconnected nodes. image 3 As shown, the second terminal 56 of the LED long string is connected to the CSP pin 64 of the integrated control circuit 52 v...
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Abstract
The invention discloses a device, which comprises a first input end for connecting an alternating power source; a second input end for connecting an alternating power source, wherein the first input end and the second input end have an input pressure difference; a rectifier connected with the first input end and the second input end; a first light string with at least one light emitting diode (LEDs); and a second light string with at least one LEDs, wherein a first current flows via the first light string but does not flow via the second light string within a first time interval; a second current flows via the first and second light strings within a second time interval, and the input pressure difference between the first input end and the second input end is higher in the second time interval than in the first time interval.
Description
technical field [0001] The invention relates to a light-emitting diode (LED) light source, a control and protection circuit; in particular, it relates to an LED light source driven by alternating current, and a control and protection current. Background technique [0002] Strings of light-emitting diodes (ie, LEDs) have become a common source of light, such as short strings of AC-powered so-called white LEDs, to name one example. AC LEDs are sometimes specific to certain circuits. For example, the AC LED circuits involved in the US Patent Nos. 5,495,147, 6,830,358, 7,045,965, 7,138,770, 7,264,381 and 7,344,275, these AC LED circuits include parallel reverse-series LED light strings. Another example is in the U.S. patent literature with patent numbers 5,463,280 and 7,276,85, which involves a bridge rectifier LED lamp string, and in the U.S. patent literature with application number 2007 / 0008721, a parallel connection of each AC LED lamp is disclosed. The light string networ...
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