CN103889111B - The linear constant current drive circuit of a kind of twin voltage operation and driving method thereof - Google Patents

The linear constant current drive circuit of a kind of twin voltage operation and driving method thereof Download PDF

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CN103889111B
CN103889111B CN201410072373.XA CN201410072373A CN103889111B CN 103889111 B CN103889111 B CN 103889111B CN 201410072373 A CN201410072373 A CN 201410072373A CN 103889111 B CN103889111 B CN 103889111B
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led
terminal
current source
power supply
diode
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CN103889111A (en
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邵蕴奇
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SHANGHAI LUAO ELECTRONIC TECHNOLOGY CO., LTD.
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SHANGHAI LUQIAN ELECTRONIC TECHNOLOGY Co Ltd
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Abstract

The invention discloses linear constant current drive circuit and driving method thereof that a kind of twin voltage runs, including a LED, the 2nd LED, diode, current source and serial and parallel switching circuit;The anode of a described LED is connected with the positive pole of power supply, the negative electrode of the oneth LED is connected with the anode of described diode, the negative electrode of described diode is connected to the anode of the 2nd LED, and the negative electrode of the 2nd LED is connected with one end of current source, and the other end of current source is connected to the negative pole of power supply;Described serial and parallel switching circuit has four terminals, is respectively used to connect the two ends of power supply and diode.When supply voltage is higher, it is series connection that serial and parallel switching circuit controls the electric connecting relation of LED and the two LED, and when supply voltage is relatively low, it is in parallel that serial and parallel switching circuit controls the electric connecting relation of LED and the two LED.

Description

The linear constant current drive circuit of a kind of twin voltage operation and driving method thereof
Technical field
The present invention relates to power supply circuits field, specifically, be related specifically to linear constant current drive circuit and driving method thereof that a kind of twin voltage runs.
Background technology
At present, LED is luminous energy-conservation with it, environmental protection and long-life and be beneficial to the development that the advantage of control is quickly swift and violent, and LED decorates, and LED illumination has entered into every field widely.The power supply of LED light emission device is mainly based on electric main and direct-flow storage battery, the design of LED drive circuit has both of which: a kind of constant current output power supply being to design high frequency switch-mode, when reasonable in design, the constant-current driving of high frequency switch-mode can take into account whole world 110/220Vac two class electrical network supply voltage, or take into account the supply voltage after the series connection of varying number accumulator, shortcoming is that circuit is complicated, and cost is high;Another kind is that the voltage series voltage of LED being configured to after connecting with the DC voltage behind commercial power rectification or accumulator is close, utilize Linear CCS that LED current limliting is driven to realize linear constant current, linear constant current drives has very simple circuit structure, there is competitiveness in cost and volume all very much, shortcoming is that input voltage range is narrower, only can be used in the line voltage condition of single 220Vac or 110Vac, or fixing battery tension must be used, such as 12V or 24V.
In illuminating industry, there is a lot of LED light device in the fabrication process, or this device final utilization which country area in the whole world can not be determined, not can determine that power supply grid is 110Vac or 220Vac, it is thus possible to meet the linear constant current drive scheme that two kinds of electrical networks of 110vac and 220vac power simultaneously and just seem necessary.
On the other hand, field of solar thermal power generation, numerous occasions use 12V battery tension or 24V battery tension, traditional linear constant current driving also cannot meet uncertain battery tension and power, it is possible to the linear constant current drive scheme simultaneously meeting two kinds of supply voltages of 12V or 24V seems necessary.
In Fig. 1, accumulator 101, LED 102 and current source 103 are in the current loop of a Guan Bi, and the voltage of accumulator 101 is more than the pressure drop of LED 102, and current source 103 limits the electric current flowing through LED 102.The shortcoming of this circuit is: if the voltage of LED is according to 12V battery designs, such as 10V, then just suitable for application in the battery-driven occasion of 24V, because efficiency is by non-normally low.Whereas if design according to 24V storage battery power supply during the voltage of LED, such as 20V, then the storage battery power supply of 12V cannot be used, because the brightness of LED can not be guaranteed.
In Fig. 2, alternating current 201 charges to storage capacitor 203 at sinusoidal wave positive-negative half-cycle peak value via commutator 202, storage capacitor 203 two ends keep a DC voltage, this DC voltage is consistently greater than the voltage at LED 205 two ends, and current source 204 undertakes the voltage exceeding LED 205 on storage capacitor 203 to maintain the current constant of LED 205.The shortcoming of this drive circuit is: if the voltage of LED is according to 110vac electrical reticulation design, such as 130V, then the occasion just powered suitable for application in 220vac electrical network, because efficiency is by non-normally low.Whereas if according to 220vac electrical network power-supply service, such as 260V during the voltage of LED, then cannot power with the line voltage of 110vac, because the brightness of LED can not be guaranteed.
Summary of the invention
It is an object of the invention to provide linear constant current drive circuit and driving method thereof that a kind of twin voltage runs, by existing power supply circuits are improved, to realize the purpose of the present invention.
Technical problem solved by the invention can realize by the following technical solutions:
The linear constant current drive circuit that a kind of twin voltage runs, including a LED, the 2nd LED, diode, current source and serial and parallel switching circuit;The anode of a described LED is connected with the positive pole of power supply, the negative electrode of the oneth LED is connected with the anode of described diode, the negative electrode of described diode is connected to the anode of the 2nd LED, and the negative electrode of the 2nd LED is connected with one end of current source, and the other end of current source is connected to the negative pole of power supply;Described serial and parallel switching circuit has the first terminal, the second terminal, the 3rd terminal and the 4th terminal, the first terminal is connected with the positive pole of power supply, second terminal is connected with the negative pole of power supply, and the 3rd terminal is connected with the anode of diode, and the 4th terminal is connected with the negative electrode of diode.
In one embodiment of the invention, described serial and parallel switching circuit includes control circuit, gate-controlled switch and switched current source;Described gate-controlled switch and switched current source all include two power end and and control end, two power end of gate-controlled switch are connected respectively to the first terminal and the 4th terminal, two power end of switched current source are connected respectively to the end that controls of the 3rd terminal and the second terminal, gate-controlled switch and switched current source and are all connected to the output of control circuit.
Described in this embodiment, the driving method of circuit is as follows:
When the voltage of power supply is less than setting voltage, control circuit controls gate-controlled switch and switched current source simultaneously turns on, oneth LED and the two LED is in parallel connection, the electric current of main circuit is divided into two passages, and a part is: power supply positive pole → one LED → switched current source → power supply negative pole;Another part is: power supply positive pole → gate-controlled switch → two LED → current source → power supply negative pole;
When the voltage of power supply is more than setting voltage, control circuit controls gate-controlled switch and switched current source simultaneously turns off, oneth LED or the 2nd LED is in series connection, and the current channel of main circuit is: power supply positive pole → one LED → diode → two LED → current source → power supply negative pole.
In another embodiment of the present invention, described serial and parallel switching circuit includes control circuit, PNP triode, switched current source, sub-diode and resistance;The emitter stage of described PNP triode is connected to the first terminal, colelctor electrode is connected to the 4th terminal, the negative pole of switched current source is connected to the second terminal, positive pole is connected with the negative electrode of sub-diode, the anode of sub-diode is connected to the 3rd terminal, and the base stage of PNP triode is connected to the negative electrode of sub-diode via resistance.
Described in this embodiment, the driving method of circuit is as follows:
When the voltage of power supply is less than setting voltage, control circuit controls PNP triode and switched current source simultaneously turns on, oneth LED and the two LED is in parallel connection, the electric current of main circuit is divided into two passages, and a part is: power supply positive pole → LED → sub-diode → switched current source → power supply negative pole;Another part is: power supply positive pole → PNP triode → two LED → current source → power supply negative pole;
When the voltage of power supply is more than setting voltage, control circuit controls PNP triode and switched current source simultaneously turns off, oneth LED and the two LED is in series connection, and the current channel of main circuit is: power supply positive pole → one LED → diode → two LED → current source → power supply negative pole.
Compared with prior art, beneficial effects of the present invention is as follows:
Achieve the linear constant current drive circuit that can adapt to two kinds of different power voltage, circuit is simple, and cost is low, it is easy to extensive use.
Accompanying drawing explanation
Fig. 1 is the battery-driven linear constant current drive circuit of prior art.
Fig. 2 is the linear constant current drive circuit of the AC-powered of prior art.
Fig. 3 is the linear constant current drive circuit block diagram of a kind of twin voltage operation of the present invention.
Fig. 4 is the serial and parallel switching circuit one schematic diagram of the present invention.
Fig. 5 is another schematic diagram of serial and parallel switching circuit of the present invention.
Fig. 6 is the linear constant current drive circuit one preferred embodiment of a kind of twin voltage operation of the present invention.
Fig. 7 is another preferred embodiment of linear constant current drive circuit of a kind of twin voltage operation of the present invention.
Detailed description of the invention
For the technological means making the present invention realize, creation characteristic, reach purpose and effect and be easy to understand, below in conjunction with detailed description of the invention, the present invention is expanded on further.
Fig. 3 is circuit block diagram of the present invention, and Fig. 3 includes a LED302, the 2nd LED303, diode 304, current source 305 and serial and parallel switching circuit 301;The anode of the oneth LED302 is connected with power supply Vin positive pole, negative electrode is connected with the anode of diode 304, the negative electrode of diode 304 is connected to the anode of the 2nd LED303, the negative electrode of the 2nd LED303 is connected with one end of current source 305, the other end of current source 305 is connected to the negative pole of power supply Vin, serial and parallel switching circuit 301 has four terminals, and wherein the first terminal and the second terminal are connected with the two ends of power supply Vin, and the 3rd terminal and the 4th terminal are connected with the two ends of diode 304.
Fig. 4 is the schematic diagram of the serial and parallel switching circuit of the present invention, and figure includes control circuit 403, gate-controlled switch 401 and switched current source 402.Wherein two power end of gate-controlled switch 401 are connected respectively to the first terminal and the 4th terminal, two power end of switched current source 402 are connected respectively to the respective control end of the 3rd terminal and the second terminal, gate-controlled switch 401 and switched current source 402 and are all connected to the output of control circuit 403.Difference according to input voltage, control circuit 403 controls gate-controlled switch 401 and switched current source 402 simultaneously turns on or simultaneously closes off, thus the electric connecting relation configuring LED302 and LED303 is in series or in parallel, to adapt to supply voltage two kinds different respectively.Below in conjunction with Fig. 3 and Fig. 4, sketch circuit theory:
When supply voltage Vin is less than setting voltage, control circuit 403 controls gate-controlled switch 401 and switched current source 402 simultaneously turns on, LED302 and LED303 is in the relation of parallel connection, the electric current of main circuit is divided into two passages, and a part is: Vin positive pole → LED302 → switched current source 402 → Vin negative pole;Another part is: Vin positive pole → gate-controlled switch 401 → LED303 → current source 305 → Vin negative pole.
When supply voltage Vin is more than setting voltage, control circuit 403 controls gate-controlled switch 401 and switched current source 402 simultaneously turns off, LED302 and LED303 is in the relation of series connection, and the current channel of main circuit is: Vin positive pole → LED302 → diode 304 → LED303 → current source 305 → Vin negative pole.
Fig. 5 is the another schematic diagram of the serial and parallel switching circuit of the present invention, and figure includes control circuit 501, PNP triode 502, switched current source 503, diode 504 and resistance 505.Wherein the emitter stage of PNP triode 502 is connected to the first terminal, colelctor electrode is connected to the 4th terminal, the negative pole of switched current source 503 is connected to the second terminal, positive pole is connected with the negative electrode of diode 504, the anode of diode 504 is connected to the 3rd terminal, and the base stage of PNP triode 502 is connected to the negative electrode of diode 504 via resistance 505.Difference according to input voltage, control circuit 501 controls switched current source 503 on and off, and when switching tube 503 turns on, its positive pole controls PNP triode 502 via resistance 505 and turns on, when switching tube 503 is closed, its positive pole controls PNP triode 502 via resistance 505 and closes.PNP triode 502 and switched current source 503 simultaneously turn on or simultaneously turn off, and the electric connecting relation being configured with LED302 and LED303 is in series or in parallel, to adapt to supply voltage two kinds different respectively.Below in conjunction with Fig. 3 and Fig. 5, sketch circuit theory:
When supply voltage Vin is less than setting voltage, control circuit 501 controls PNP triode 502 and switched current source 503 simultaneously turns on, LED302 and LED303 is in the relation of parallel connection, the electric current of main circuit is divided into two passages, and a part is: Vin positive pole → LED302 → diode 504 → switched current source, 503 → Vin negative pole;Another part is: Vin positive pole → PNP triode 502 → LED303 → current source 305 → Vin negative pole.
When supply voltage Vin is more than setting voltage, control circuit 501 controls PNP triode 502 and switched current source 503 simultaneously turns off, LED302 and LED303 is in the relation of series connection, and the current channel of main circuit is: Vin positive pole → LED302 → diode 304 → LED303 → current source 305 → Vin negative pole.
Fig. 6 is a preferred embodiment of the present invention, and figure includes accumulator 601, LED602 and 603, diode 604, current source 605 and serial and parallel switching circuit 600.Wherein, the positive pole of accumulator 601 is connected with the anode of LED602, and the negative electrode of LED602 is connected with the anode of diode 604, and the negative electrode of diode 604 is connected with the anode of LED603, the negative electrode of LED603 is connected with the positive pole of current source 605, and the negative pole of current source 605 is connected with the negative pole of accumulator 601;Serial and parallel switching circuit 600 has four terminals, and its first terminal is connected with the positive pole of accumulator 601, and the second terminal is connected with the negative pole of accumulator 601, and the 3rd terminal is connected with the anode of diode 604, and the 4th terminal is connected with the negative electrode of diode 604;Serial and parallel switching circuit 600 comprises control circuit 613, P type field effect transistor 606, switched current source 607.
Wherein, the source electrode of P type field effect transistor 606 is connected with the first terminal of serial and parallel switching circuit 600, and drain electrode is connected with the 4th terminal of serial and parallel switching circuit 600;The positive end of switched current source 607 is connected to the 3rd terminal of serial and parallel switching circuit 600, and negative power end is connected to the second terminal of serial and parallel switching circuit 600;Control circuit 613 comprises field N-type effect pipe 608, comparator 609, voltage reference 610.Wherein, the inverting input of comparator 609 is connected with the first terminal of serial and parallel switching circuit 600, and in-phase input end is connected with voltage reference 610, and outfan controls switched current source 607;The negative pole of voltage reference 610 is connected with the second terminal of serial and parallel switching circuit 600 with the source electrode of N-type field effect transistor 608.The drain electrode of N-type field effect transistor 608 is connected with the source electrode of P type field effect transistor 606, and gate pole is connected to the output of comparator 609.
Its operation principle is summarized as follows:
When the voltage of accumulator 601 is less than voltage reference 610, comparator 609 is output as height, and switched current source 607 turns on, and N-type field effect transistor 608 and P type field effect transistor 606 are also switched on;Otherwise, when the voltage of accumulator 601 is more than voltage reference 610, comparator 609 is output as low, and switched current source 607 turns off, and N-type field effect transistor 608 and P type field effect transistor 606 are also switched off;
When P type field effect transistor 606 and switched current source 607 are both turned on time, accumulator 601, LED602 and switched current source 607 constitute the first current loop, accumulator 601, P type field effect transistor 606, LED603 and current source 605 constitute the second current loop, the relation of LED602 and LED603 is in parallel, and diode 604 reversely ends.
When P type field effect transistor 606 and switched current source 607 are turned off time, accumulator 601, LED602, diode 604, LED603 and current source 605 constitute current loop, and the relation of LED602 and LED603 is series connection.
Two groups of LED strip, when supply voltage is more than setting value, are joined by the present embodiment, when supply voltage is less than setting value, two groups of LED are in parallel, it is achieved that a kind of LED and drive circuitry parameter can operations under supply voltage two kinds different.
Fig. 7 is a preferred embodiment of the present invention, and figure includes alternating current 713, rectifier bridge 712, storage capacitor 701, LED702 and 703, diode 704, current source 705 and serial and parallel switching circuit 700.Wherein, alternating current 713 is connected with the input of rectifier bridge 712, and the outfan of rectifier bridge 712 is connected with the two ends of storage capacitor 701, and rectifier bridge 712 constitutes with storage capacitor 701 and exchanges the current rectifying and wave filtering circuit turning direct current.
The positive pole of storage capacitor 701 is connected with the anode of LED702, the negative electrode of LED702 is connected with the anode of diode 704, the negative electrode of diode 704 is connected with the anode of LED703, and the negative electrode of LED703 is connected with the positive pole of current source 705, and the negative pole of current source 705 is connected with the negative pole of storage capacitor 701;Serial and parallel switching circuit 700 has four terminals, and its first terminal is connected with the positive pole of storage capacitor 701, and the second terminal is connected with the negative pole of storage capacitor 701, and the 3rd terminal is connected with the anode of diode 704, and the 4th terminal is connected with the negative electrode of diode 704;Serial and parallel switching circuit 700 comprises control circuit 713, PNP triode 706, switched current source 707, diode 711 and resistance 708.Wherein, PNP triode 706 emitter stage is connected with the first terminal of serial and parallel switching circuit 700, and colelctor electrode is connected with the 4th terminal of serial and parallel switching circuit 700, and base stage is connected via the negative electrode of resistance 708 with diode 711;The positive end of switched current source 707 is connected to the negative electrode of diode 711, and the anode of diode 711 is connected to the 3rd terminal of serial and parallel switching circuit 700, and the negative power end of switched current source 707 is connected to the second terminal of serial and parallel switching circuit 700;Control circuit 713 comprises comparator 709, voltage reference 710.
Wherein, the inverting input of comparator 709 is connected with the first terminal of serial and parallel switching circuit 700, and in-phase input end is connected with voltage reference 710, and outfan controls switched current source 707;The negative pole of voltage reference 710 is connected with the second terminal of serial and parallel switching circuit 600.
Its operation principle is summarized as follows:
When alternating current 713 is applied to the voltage at storage capacitor 701 two ends less than voltage reference 710, comparator 709 is output as height, and switched current source 707 turns on, and PNP triode 706 is also switched on;Otherwise, when alternating current 713 is applied to the voltage at storage capacitor 701 two ends more than voltage reference 710, comparator 709 is output as low, and switched current source 707 turns off, and PNP triode 706 is also switched off;
When PNP triode 706 and switched current source 707 are both turned on time, storage capacitor 701, LED702, diode 711 and switched current source 707 constitute the first current loop, storage capacitor 701, PNP triode 706, LED703 and current source 705 constitute the second current loop, the relation of LED702 and LED703 is in parallel, and diode 704 reversely ends.
When PNP triode 706 and switched current source 707 are turned off time, storage capacitor 701, LED702, diode 704, LED703 and current source 705 constitute current loop, and the relation of LED702 and LED703 is series connection.
Two groups of LED strip connection, when alternating voltage is more than setting value, is connected, when supply voltage is less than setting value, is connected in parallel by two groups of LED by the present embodiment, it is achieved that a kind of LED and drive circuitry parameter can operations under alternating supply voltage two kinds different.
Described switch includes various equivalent switch electronic device, is not limited to diode or audion.
Word " equal ", " identical " " simultaneously " or other similar terms, what be not limited in mathematical term is definitely equal or identical, when implementing right described in this patent, it is possible to be close on engineering significance or in acceptable range of error.
Described " being connected " or " connection ", not only include being joined directly together two entities, also includes being indirectly connected to by having useful other entities improving effect.
The ultimate principle of the present invention and principal character and advantages of the present invention have more than been shown and described.Skilled person will appreciate that of the industry; the present invention is not restricted to the described embodiments; described in above-described embodiment and description is that principles of the invention is described; without departing from the spirit and scope of the present invention; the present invention also has various changes and modifications, and these changes and improvements both fall within the claimed scope of the invention.Claimed scope is defined by appending claims and equivalent thereof.

Claims (5)

1. the linear constant current drive circuit that a twin voltage runs, it is characterised in that: include a LED, the 2nd LED, diode, current source and serial and parallel switching circuit;The anode of a described LED is connected with the positive pole of power supply, the negative electrode of the oneth LED is connected with the anode of described diode, the negative electrode of described diode is connected to the anode of the 2nd LED, and the negative electrode of the 2nd LED is connected with one end of current source, and the other end of current source is connected to the negative pole of power supply;Described serial and parallel switching circuit has the first terminal, the second terminal, the 3rd terminal and the 4th terminal, the first terminal is connected with the positive pole of power supply, second terminal is connected with the negative pole of power supply, and the 3rd terminal is connected with the anode of diode, and the 4th terminal is connected with the negative electrode of diode;
Described serial and parallel switching circuit includes control circuit, gate-controlled switch and switched current source;Described gate-controlled switch and switched current source all include two power end and and control end, two power end of gate-controlled switch are connected respectively to the first terminal and the 4th terminal, two power end of switched current source are connected respectively to the end that controls of the 3rd terminal and the second terminal, gate-controlled switch and switched current source and are all connected to the output of control circuit;
Described control circuit comprises comparator and voltage reference;The inverting input of comparator is connected with the first terminal of serial and parallel switching circuit, and in-phase input end is connected with voltage reference, and outfan controls switched current source;The negative pole of voltage reference is connected with the second terminal of serial and parallel switching circuit.
2. the linear constant current drive circuit that a kind of twin voltage according to claim 1 runs, it is characterised in that: described serial and parallel switching circuit also includes resistance and serial and parallel switching circuit diode;
The anode of described serial and parallel switching circuit diode is connected to the 3rd terminal of serial and parallel switching circuit, and negative pole is connected with the positive end of switched current source;
Described resistance one end is connected with the negative pole of described serial and parallel switching circuit diode;The other end is connected with the control end of described gate-controlled switch.
3. the driving method of the linear constant current drive circuit that the twin voltage that a kind is applied to described in claim 1 runs, it is characterised in that:
When the voltage of power supply is less than setting voltage, control circuit controls gate-controlled switch and switched current source simultaneously turns on, oneth LED and the two LED is in parallel connection, the electric current of main circuit is divided into two passages, and a part is: power supply positive pole → one LED → switched current source → power supply negative pole;Another part is: power supply positive pole → gate-controlled switch → two LED → current source → power supply negative pole;
When the voltage of power supply is more than setting voltage, control circuit controls gate-controlled switch and switched current source simultaneously turns off, oneth LED and the two LED is in series connection, and the current channel of main circuit is: power supply positive pole → one LED → diode → two LED → current source → power supply negative pole.
4. the linear constant current drive circuit that a twin voltage runs, it is characterised in that: include a LED, the 2nd LED, diode, current source and serial and parallel switching circuit;The anode of a described LED is connected with the positive pole of power supply, the negative electrode of the oneth LED is connected with the anode of described diode, the negative electrode of described diode is connected to the anode of the 2nd LED, and the negative electrode of the 2nd LED is connected with one end of current source, and the other end of current source is connected to the negative pole of power supply;Described serial and parallel switching circuit has the first terminal, the second terminal, the 3rd terminal and the 4th terminal, the first terminal is connected with the positive pole of power supply, second terminal is connected with the negative pole of power supply, and the 3rd terminal is connected with the anode of diode, and the 4th terminal is connected with the negative electrode of diode;
Described serial and parallel switching circuit includes control circuit, PNP triode, switched current source, serial and parallel switching circuit diode and resistance;The emitter stage of described PNP triode is connected to the first terminal, colelctor electrode is connected to the 4th terminal, the negative power end of switched current source is connected to the second terminal, positive end is connected with the negative electrode of serial and parallel switching circuit diode, the anode of serial and parallel switching circuit diode is connected to the 3rd terminal, and the base stage of PNP triode is connected to the negative electrode of serial and parallel switching circuit diode via resistance;
Described control circuit comprises comparator and voltage reference;The inverting input of comparator is connected with the first terminal of serial and parallel switching circuit, and in-phase input end is connected with voltage reference, and outfan controls switched current source;The negative pole of voltage reference is connected with the second terminal of serial and parallel switching circuit.
5. the driving method of the linear constant current drive circuit that the twin voltage that a kind is applied to described in claim 4 runs, it is characterised in that:
When the voltage of power supply is less than setting voltage, control circuit controls PNP triode and switched current source simultaneously turns on, oneth LED and the two LED is in parallel connection, the electric current of main circuit is divided into two passages, and a part is: power supply positive pole → one LED → serial and parallel switching circuit diode → switched current source → power supply negative pole;Another part is: power supply positive pole → PNP triode → two LED → current source → power supply negative pole;When the voltage of power supply is more than setting voltage, control circuit controls PNP triode and switched current source simultaneously turns off, oneth LED and the two LED is in series connection, and the current channel of main circuit is: power supply positive pole → one LED → diode → two LED → current source → power supply negative pole.
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