CN203219579U - Alternating current directly driving LED integrated circuit for low voltage bypass power taking - Google Patents
Alternating current directly driving LED integrated circuit for low voltage bypass power taking Download PDFInfo
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- CN203219579U CN203219579U CN 201320215188 CN201320215188U CN203219579U CN 203219579 U CN203219579 U CN 203219579U CN 201320215188 CN201320215188 CN 201320215188 CN 201320215188 U CN201320215188 U CN 201320215188U CN 203219579 U CN203219579 U CN 203219579U
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Abstract
An existing alternating current directly driving LED integrated circuit has the disadvantages of high power consumption, poor low reliability and high cost. The utility model provides an alternating current directly driving LED integrated circuit suitable for low voltage bypass power taking. The integrated circuit is formed by a voltage stabilizing circuit, a low-voltage electronic switch circuit, an undervoltage control circuit, a comparison and amplification circuit. The integrated circuit comprises three pins which are a positive power supply terminal, a zero potential reference end and a current sampling and low voltage electronic switch common terminal. The alternating current directly driving LED integrated circuit for low voltage bypass power taking has the outstanding technical effect that the product has the advantages of low power consumption, high efficiency, high reliability, low cost, few pins, few external components and convenient use.
Description
Technical field
The utility model belongs to electronic applications, is specifically related to the integrated circuit of the direct driving LED of interchange of low voltage bypass power taking.
Background technology
Exchange direct driving LED and have characteristics such as simple in structure, that cost is low, the life-span is long and be subjected to extensive attention, exchanging direct driving LED integrated circuit is the key problem in technology that exchanges direct driving LED.But in the direct driving LED integrated circuit technique of existing interchange, the method of supplying power to of its integrated circuit all is to adopt the direct way to take power of ac high-voltage, mainly comprise the power resistor step-down, method such as high pressure is nonpolarity large bulk capacitance step-down, transformer transformation and Switching Power Supply, 220 volts or 110 volts of civil power ac high-voltages are transformed into dc low-voltage to provide low-voltage dc power supply to integrated circuit.The distinct disadvantage of existing resistance step-down technology is that the useless power that is dissipated on the step-down power resistor is big especially, the shortcoming of capacitance decompression technology is that anti-lightning surge characteristic is poor, reliability is low, transformer transformation technical efficiency is low, volume is big, switch power technology circuit complexity, cost height.It is in actual applications that the technology of this ac high-voltage power taking also has a particular importance technical disadvantages, not only many but also long ac high-voltage link to each other the difficult wiring that tends to cause LED load and integrated circuit circuit board, cause that the wiring board area increases, reliability reduces.Particularly importantly for extensive use at present and chip substrate (COB) technology of continuous develop rapidly, be about to led chip and exchange the technology of direct driving LED integrated circuit (IC) chip pressure welding on pottery or aluminium base, the technology of the ac high-voltage power taking of the direct driving LED integrated circuit of existing ac high-voltage power supply, often need not only many but also and long and voltage up to the high pressure line of hundreds of volts and high-pressure electronic components and parts, obviously increase LED and ic core plate base area, reduce reliability of products and increase manufacturing cost.
The utility model content
At the above-mentioned deficiency of the integrated circuit of the direct driving LED of existing interchange, the utility model provides a kind of integrated circuit of the direct driving LED of interchange of low voltage bypass power taking, and its concrete structure is:
This integrated circuit is a kind of integrated circuit that is suitable for the direct driving LED of interchange of low voltage bypass power taking, this integrated circuit is made up of voltage stabilizing circuit 1, Low-voltage Electronic switching circuit 2, under-voltage control circuit 3, comparison amplifying circuit 4, and be provided with three pins, be respectively positive power source terminal, current sample and the public end of Low-voltage Electronic switch, zero potential reference edge; Wherein, positive power source terminal is connected with voltage stabilizing circuit 1, Low-voltage Electronic switching circuit 2 and under-voltage control circuit 3 respectively; One tunnel output of voltage stabilizing circuit 1 is connected with the input of under-voltage control circuit 3; The output of under-voltage control circuit 3 is connected with Low-voltage Electronic switching circuit 2 inputs; Another road output of voltage stabilizing circuit 1 is connected with the input that compares amplifying circuit 4; Relatively amplifying circuit 4 outputs are connected with Low-voltage Electronic switching circuit 2 inputs; Current sample is connected with comparison amplifying circuit 4 with Low-voltage Electronic switching circuit 2 respectively with the public end of Low-voltage Electronic switch; Mode by series current sampling resistor Rs is connected with current sample the zero potential reference edge with the public end of Low-voltage Electronic switch; Voltage stabilizing circuit 1 provides stabilized voltage power supply for comparing amplifying circuit 4; Low-voltage Electronic switching circuit 2 has access and the short circuit of two kinds of operating states, corresponding LED load respectively; Under-voltage control circuit 3 has fixing threshold voltage, and when the low voltage bypass power taking transient voltage of integrated circuit was lower than the threshold voltage of under-voltage control circuit 3, under-voltage control circuit 3 kept open circuit with Low-voltage Electronic switching circuit 2 and the LED load unit of correspondence is inserted; Relatively amplifying circuit 4 voltage contrasting amplified circuits have two difference output ends, its in the same way output link to each other with the input of under-voltage control circuit 3, its inverse output terminal links to each other with the input control end of Low-voltage Electronic switching circuit 2; Relatively be provided with reference voltage in the amplifying circuit 4, relatively amplifying circuit 4 relatively amplifies back output control level with the voltage swing on the current sampling resistor and reference voltage and Low-voltage Electronic switching circuit 2 is carried out switch controls, when the voltage of current sampling resistor during greater than reference voltage, Low-voltage Electronic switching circuit 2 inserts the LED load unit, when the voltage of current sampling resistor during less than reference voltage, Low-voltage Electronic switching circuit 2 is with LED load unit short circuit;
Low-voltage Electronic switching circuit 2 is made up of triode Q23, triode Q25, triode Q26 and triode Q27; Wherein the emitter of triode Q23 links to each other with the zero potential reference edge, and the collector electrode of triode Q23 links to each other with the collector electrode of triode Q25 and the base stage of triode Q26 respectively; The collector electrode of the collector electrode of the emitter of triode Q25, triode Q26 and triode Q27 links to each other with positive power source terminal jointly; The emitter of triode Q26 links to each other with the base stage of triode Q27, and the emitter of triode Q27 links to each other with the public end of Low-voltage Electronic switch with current sample; Wherein, triode Q25 is the triode of positive-negative-positive, and triode Q23, triode Q26 and triode Q27 are the triode of NPN type;
Under-voltage control circuit 3 is made of triode Q24 and triode Q22; Wherein the emitter of triode Q24 links to each other with positive supply, and the collector electrode of the base stage of triode Q24, triode Q24 and the collector electrode of triode Q22 interconnect, and the emitter of triode Q22 links to each other with the zero potential reference edge; Wherein, triode Q24 is the positive-negative-positive triode, and triode Q22 is NPN type triode;
Relatively amplifying circuit 4 is made of triode Q1, triode Q2, triode Q3, triode Q4, triode Q10, triode Q11, triode Q5, triode Q6, triode Q7, triode Q8, triode Q9, triode Q12, triode Q13, resistance R 1, resistance R 2, resistance R 3 and resistance R 5; Wherein, an end of the collector electrode of the base stage triode Q10 of the base stage of the base stage of the base stage of triode Q1, triode Q2, triode Q11, triode Q10 and resistance R 3 links to each other; The other end of resistance R 3 links to each other with the collector electrode of triode Q9, the base stage of triode Q9 respectively; The emitter of the emitter of the collector electrode of the collector electrode of triode Q1, triode Q2, triode Q3 and triode Q4 interconnects; One end of the collector electrode of the base stage of triode Q3, triode Q5 and resistance R 1 links to each other; The collector electrode of triode Q3 links to each other with the zero potential reference edge; One end of the collector electrode of the base stage of triode Q4, triode Q6 and resistance R 2 interconnects and connects; The collector electrode of the collector electrode of the emitter of the emitter of triode Q5, triode Q6, triode Q7 and triode Q8 interconnects; The base stage of the collector electrode of the collector electrode of the base stage of triode Q5, triode Q11, triode Q12 and triode Q12 interconnects; The base stage of the collector electrode of the emitter of triode Q12, triode Q13 and triode Q13 interconnects; The base stage of triode Q6 links to each other with an end of resistance R 5, the other end of resistance R 5 links to each other with the public end of Low-voltage Electronic switch with current sample; The base stage of the base stage of the base stage of triode Q7, triode Q8, triode Q9 interconnects; The emitter of the emitter of the emitter of the emitter of triode Q13, triode Q7, triode Q8, triode Q9 links to each other with the zero potential reference edge; Wherein, triode Q1, triode Q2, triode Q3, triode Q4, triode Q10 and triode Q11 are the triode of positive-negative-positive, and triode Q5, triode Q6, triode Q7, triode Q8, triode Q9, triode Q12, triode Q13 are the triode of NPN type;
Connected mode is between above-mentioned four functional circuits: the emitter that plays the triode Q14 of voltage stabilizing output action in the voltage stabilizing circuit 1 is voltage stabilizing output, the emitter of the emitter of the triode Q1 in the emitter of triode Q14 and the amplifying circuit 4 relatively, the emitter of triode Q2, triode Q10 and, the emitter of triode Q11, the other end of resistance R 1, the other end of resistance R 2 interconnect; The base stage of triode Q22 in the base stage of triode Q21 in the voltage stabilizing circuit 1 and the node of collector electrode short circuit and the under-voltage control circuit 3 links to each other; Relatively the base stage of the triode Q23 in the collector electrode of the triode Q4 in the amplifying circuit 4 and the low tension switch control circuit 2 links to each other; Relatively the other end of the resistance R 5 of amplifying circuit 4 links to each other with the public end of Low-voltage Electronic switch with the emitter of the triode Q27 of low voltage switching circuit 2 and with current sample, be connected with emitter back and link to each other with the base stage of the interior triode Q25 of Low-voltage Electronic switching circuit 2 of the base stage of the triode Q24 in the under-voltage control circuit 3.
Good effect of the present utility model is:
The utility model provide the integrated circuit of the direct driving LED of interchange of low voltage bypass power taking have low in energy consumption, efficient is high, reliability is high, cost is low, pin is few, outward element is few and advantage such as easy to use.
Description of drawings
Fig. 1 is circuit theory diagrams of the present utility model.
Fig. 2 is circuit structure block diagram of the present utility model.
Fig. 3 is that schematic diagram is used in expansion of the present utility model.
Embodiment
Below in conjunction with accompanying drawing, the utility model is described in further detail.
As shown in Figure 1, this integrated circuit is a kind of integrated circuit that is suitable for the direct driving LED of interchange of low voltage bypass power taking, this integrated circuit is made up of voltage stabilizing circuit 1, Low-voltage Electronic switching circuit 2, under-voltage control circuit 3, comparison amplifying circuit 4, and be provided with three pins, be respectively positive power source terminal, current sample and the public end of Low-voltage Electronic switch, zero potential reference edge; Wherein, positive power source terminal is connected with voltage stabilizing circuit 1, Low-voltage Electronic switching circuit 2 and under-voltage control circuit 3 respectively; One tunnel output of voltage stabilizing circuit 1 is connected with the input of under-voltage control circuit 3; The output of under-voltage control circuit 3 is connected with Low-voltage Electronic switching circuit 2 inputs; Another road output of voltage stabilizing circuit 1 is connected with the input that compares amplifying circuit 4; Relatively amplifying circuit 4 outputs are connected with Low-voltage Electronic switching circuit 2 inputs; Current sample is connected with comparison amplifying circuit 4 with Low-voltage Electronic switching circuit 2 respectively with the public end of Low-voltage Electronic switch; Mode by series current sampling resistor Rs is connected with current sample the zero potential reference edge with the public end of Low-voltage Electronic switch; Voltage stabilizing circuit 1 provides stabilized voltage power supply for comparing amplifying circuit 4; Low-voltage Electronic switching circuit 2 has access and the short circuit of two kinds of operating states, corresponding LED load respectively; Under-voltage control circuit 3 has fixing threshold voltage, and when the low voltage bypass power taking transient voltage of integrated circuit was lower than the threshold voltage of under-voltage control circuit 3, under-voltage control circuit 3 kept open circuit with Low-voltage Electronic switching circuit 2 and the LED load unit of correspondence is inserted; Relatively amplifying circuit 4 voltage contrasting amplified circuits have two difference output ends, its in the same way output link to each other with the input of under-voltage control circuit 3, its inverse output terminal links to each other with the input control end of Low-voltage Electronic switching circuit 2; Relatively be provided with reference voltage in the amplifying circuit 4, relatively amplifying circuit 4 relatively amplifies back output control level with the voltage swing on the current sampling resistor and reference voltage and Low-voltage Electronic switching circuit 2 is carried out switch controls, when the voltage of current sampling resistor during greater than reference voltage, Low-voltage Electronic switching circuit 2 inserts the LED load unit, when the voltage of current sampling resistor during less than reference voltage, Low-voltage Electronic switching circuit 2 is with LED load unit short circuit;
Low-voltage Electronic switching circuit 2 is made up of triode Q23, triode Q25, triode Q26 and triode Q27; Wherein the emitter of triode Q23 links to each other with the zero potential reference edge, and the collector electrode of triode Q23 links to each other with the collector electrode of triode Q25 and the base stage of triode Q26 respectively; The collector electrode of the collector electrode of the emitter of triode Q25, triode Q26 and triode Q27 links to each other with positive power source terminal jointly; The emitter of triode Q26 links to each other with the base stage of triode Q27, and the emitter of triode Q27 links to each other with the public end of Low-voltage Electronic switch with current sample; Wherein, triode Q25 is the triode of positive-negative-positive, and triode Q23, triode Q26 and triode Q27 are the triode of NPN type;
Under-voltage control circuit 3 is made of triode Q24 and triode Q22; Wherein the emitter of triode Q24 links to each other with positive supply, and the collector electrode of the base stage of triode Q24, triode Q24 and the collector electrode of triode Q22 interconnect, and the emitter of triode Q22 links to each other with the zero potential reference edge; Wherein, triode Q24 is the positive-negative-positive triode, and triode Q22 is NPN type triode;
Relatively amplifying circuit 4 is made of triode Q1, triode Q2, triode Q3, triode Q4, triode Q10, triode Q11, triode Q5, triode Q6, triode Q7, triode Q8, triode Q9, triode Q12, triode Q13, resistance R 1, resistance R 2, resistance R 3 and resistance R 5; Wherein, an end of the collector electrode of the base stage triode Q10 of the base stage of the base stage of the base stage of triode Q1, triode Q2, triode Q11, triode Q10 and resistance R 3 links to each other; The other end of resistance R 3 links to each other with the collector electrode of triode Q9, the base stage of triode Q9 respectively; The emitter of the emitter of the collector electrode of the collector electrode of triode Q1, triode Q2, triode Q3 and triode Q4 interconnects; One end of the collector electrode of the base stage of triode Q3, triode Q5 and resistance R 1 links to each other; The collector electrode of triode Q3 links to each other with the zero potential reference edge; One end of the collector electrode of the base stage of triode Q4, triode Q6 and resistance R 2 interconnects and connects; The collector electrode of the collector electrode of the emitter of the emitter of triode Q5, triode Q6, triode Q7 and triode Q8 interconnects; The base stage of the collector electrode of the collector electrode of the base stage of triode Q5, triode Q11, triode Q12 and triode Q12 interconnects; The base stage of the collector electrode of the emitter of triode Q12, triode Q13 and triode Q13 interconnects; The base stage of triode Q6 links to each other with an end of resistance R 5, the other end of resistance R 5 links to each other with the public end of Low-voltage Electronic switch with current sample; The base stage of the base stage of the base stage of triode Q7, triode Q8, triode Q9 interconnects; The emitter of the emitter of the emitter of the emitter of triode Q13, triode Q7, triode Q8, triode Q9 links to each other with the zero potential reference edge; Wherein, triode Q1, triode Q2, triode Q3, triode Q4, triode Q10 and triode Q11 are the triode of positive-negative-positive, and triode Q5, triode Q6, triode Q7, triode Q8, triode Q9, triode Q12, triode Q13 are the triode of NPN type;
Connected mode is between above-mentioned four functional circuits: the emitter that plays the triode Q14 of voltage stabilizing output action in the voltage stabilizing circuit 1 is voltage stabilizing output, the emitter of the emitter of the triode Q1 in the emitter of triode Q14 and the amplifying circuit 4 relatively, the emitter of triode Q2, triode Q10 and, the emitter of triode Q11, the other end of resistance R 1, the other end of resistance R 2 interconnect; The base stage of triode Q22 in the base stage of triode Q21 in the voltage stabilizing circuit 1 and the node of collector electrode short circuit and the under-voltage control circuit 3 links to each other; Relatively the base stage of the triode Q23 in the collector electrode of the triode Q4 in the amplifying circuit 4 and the low tension switch control circuit 2 links to each other; Relatively the other end of the resistance R 5 of amplifying circuit 4 links to each other with the public end of Low-voltage Electronic switch with the emitter of the triode Q27 of low voltage switching circuit 2 and with current sample, be connected with emitter back and link to each other with the base stage of the interior triode Q25 of Low-voltage Electronic switching circuit 2 of the base stage of the triode Q24 in the under-voltage control circuit 3.
The voltage stabilizing output voltage of voltage stabilizing circuit 1 is about 2.4 volts; Low-voltage Electronic switching circuit 2 has two kinds of operating states, access and the short circuit of the corresponding LED load unit of difference, the threshold value of under-voltage control circuit 3 is about 3.0 volts, when the low voltage bypass power taking transient voltage of integrated circuit was lower than the threshold voltage of under-voltage control circuit 3, under-voltage control circuit 3 kept open circuit with Low-voltage Electronic switching circuit 2 and corresponding LED load unit is inserted; Relatively the reference voltage value of amplifying circuit 4 is about 1.2 volts, relatively amplifying circuit 4 relatively amplifies back output control level with the voltage swing on the current sampling resistor and reference voltage and Low-voltage Electronic switching circuit 2 is carried out switch controls, when the voltage of current sampling resistor during greater than reference voltage, Low-voltage Electronic switching circuit 2 inserts the LED load unit, when the voltage of current sampling resistor during less than reference voltage, Low-voltage Electronic switching circuit 2 is with LED load unit short circuit.
Fig. 2 is the circuit structure block diagram of this integrated circuit.This integrated circuit is made up of voltage stabilizing circuit 1, Low-voltage Electronic switching circuit 2, under-voltage control circuit 3 and comparison amplifying circuit 4.It is the public end Vs of positive power source terminal V+, current sample and Low-voltage Electronic switch, zero potential reference edge V-that this integrated circuit has three pins.LED1 ~ the LEDN of series aiding connection is external loading, and Rs is the external current sampling resistor of integrated circuit.The input voltage of voltage stabilizing circuit 1 is integrated circuit V+, the output voltage of voltage stabilizing circuit 1 is about 2.4 volts, giving relatively, amplifying circuit 4 provides power supply, this voltage stabilizing circuit has the under-voltage low level output of input voltage, and link to each other with the input of under-voltage control circuit 3, the output of under-voltage control circuit links to each other with the input of Low-voltage Electronic switching circuit 2, when V+ is lower than 3.0 volts, the Low-voltage Electronic switching circuit keeps open-circuit condition, makes the external LED load unit be in access state.Relatively the input of amplifying circuit 4 links to each other with the switch control end of Low-voltage Electronic switching circuit 2, as current sample and the public end Vs of Low-voltage Electronic switch of integrated circuit.Relatively the output of amplifying circuit 4 links to each other with another input of Low-voltage Electronic switch 2.Relatively amplifying circuit 4 is exported high-low level respectively according to the voltage swing from current sampling resistor, and the Low-voltage Electronic switching circuit inserts respectively with the switch of short circuit the external LED load unit and controls.
As shown in Figure 3, D1 is rectifier bridge among the figure, U1～U8 is integrated circuit of the present utility model, LED1～LED40 is the LED load unit of the uncontrolled forward series connection that inserts all the time, and LED41～LED50 is that the LED load unit of first group of controlled forward series connection, external current sampling resistor, the LED111～LED120 that Rs1 is integrated circuit U1 are the LED load unit of the 8th group of controlled forward series connection, the external current sampling resistor that Rs8 is integrated circuit U8.Frequency is the electric main of 185 volts～265 volts of 50Hz voltage effective values, obtaining frequency after rectifier bridge D1 full-wave rectification is the unidirectional pulsating voltage of 100Hz, the crest voltage of this unidirectional pulsating voltage is about 1.414 times of AC-input voltage effective value, namely is about 261 volts～375 volts.The resistance of external sampling resistor Rs1～Rs8 is that ladder distributes, and its resistance is respectively 10 Ω, 11 Ω, 12 Ω, 13 Ω, 15 Ω, 16 Ω, 18 Ω, 20 Ω.The rated operational current of LED1～LED120 is 100mA, the forward conduction voltage of LED is 3.5 volts under this electric current.Integrated circuit U1～U8 of the present utility model has three pins, is positive power source terminal V+, zero potential reference edge V-, current sample and the public end Vs of Low-voltage Electronic switch respectively.
As seen from Figure 3, low voltage bypass electricity-fetching method of the present utility model is: the positive power source terminal V+ of integrated circuit U1 links to each other with the positive pole of LED41, LED41～LED50 forward series connection, the negative pole of LED50 links to each other with the end of current sampling resistor Rs1 and links to each other with the public end Vs of Low-voltage Electronic switch with the current sample of integrated circuit U1, and the other end of Rs1 links to each other with the zero potential reference edge V-of integrated circuit U1.The supply voltage of integrated circuit U1 also is that frequency is the unidirectional pulsating voltage of 100Hz, its peak value equals the transient voltage on first group of controlled LED load unit (LED41～LED50 forward series connection) and the sampling resistor R1, when the Low-voltage Electronic switch of integrated circuit U1 is in open-circuit condition, the corresponding access state of first group of controlled LED load unit (LED41～LED50 forward series connection), its conducting voltage is about 35 volts, the voltage drop of sampling resistor Rs1 is about 1.0 volts, the frequency of the low voltage bypass power taking voltage of integrated circuit U1 is 100Hz at this moment, and crest voltage is 36 volts.When the Low-voltage Electronic switch of integrated circuit U1 is in short-circuit condition, the corresponding short circuit state of one group of controlled LED load unit (LED41～LED50 forward series connection), its short circuit voltage drop is about 2.0 volts, the voltage drop of sampling resistor Rs1 is about 1.0 volts, and at this moment the low voltage bypass power taking voltage of integrated circuit U1 is less than or equal to 3.0 volts.
As shown in Figure 3 be the direct driving LED circuit of interchange of using a kind of 8 grades of switches control of the present utility model, wherein U1～U8 is 8 integrated circuits of the present utility model, obtain power supply by the low voltage bypass power taking respectively, respectively the LED of 8 groups of series aiding connections is inserted switch control with short circuit.Particularly importantly the resistance of external 8 current sampling resistor Rs1～Rs8 of 8 integrated circuits is different, and their resistance is that ladder distributes, and for example their resistance is respectively 10 Ω, 11 Ω, 12 Ω, 13 Ω, 15 Ω, 16 Ω, 18 Ω, 20 Ω.
The key technical indexes by the direct driving LED circuit of interchange of application shown in Figure 3 a kind of 8 grades of switches control of the present utility model is: 185～265 volts of AC-input voltage scopes, drive circuit efficient when interchange is imported 220 volts is greater than 94%, power factor is greater than 0.96, and total harmonic distortion is less than 25%.
Claims (1)
1. the integrated circuit of the direct driving LED of interchange of low voltage bypass power taking is characterized in that,
This integrated circuit is a kind of integrated circuit that is suitable for the direct driving LED of interchange of low voltage bypass power taking, this integrated circuit is made up of voltage stabilizing circuit (1), Low-voltage Electronic switching circuit (2), under-voltage control circuit (3), comparison amplifying circuit (4), and be provided with three pins, be respectively positive power source terminal, current sample and the public end of Low-voltage Electronic switch, zero potential reference edge; Wherein, the voltage got of positive power source terminal is 10～60 volts unidirectional pulsating voltage; Positive power source terminal is connected with voltage stabilizing circuit (1), Low-voltage Electronic switching circuit (2) and under-voltage control circuit (3) respectively; One tunnel output of voltage stabilizing circuit (1) is connected with the input of under-voltage control circuit (3); The output of under-voltage control circuit (3) is connected with Low-voltage Electronic switching circuit (2) input; Another road output of voltage stabilizing circuit (1) is connected with the input that compares amplifying circuit (4); Relatively amplifying circuit (4) output is connected with Low-voltage Electronic switching circuit (2) input; Current sample is connected with comparison amplifying circuit (4) with Low-voltage Electronic switching circuit (2) respectively with the public end of Low-voltage Electronic switch; Mode by series current sampling resistor Rs is connected with current sample the zero potential reference edge with the public end of Low-voltage Electronic switch; Voltage stabilizing circuit (1) provides stabilized voltage power supply for comparing amplifying circuit (4); Low-voltage Electronic switching circuit (2) has access and the short circuit of two kinds of operating states, corresponding LED load respectively; Under-voltage control circuit (3) has fixing threshold voltage, when the low voltage bypass power taking transient voltage of integrated circuit was lower than the threshold voltage of under-voltage control circuit (3), under-voltage control circuit (3) kept open circuit with Low-voltage Electronic switching circuit (2) and the LED load unit of correspondence is inserted; Relatively amplifying circuit (4) voltage contrasting amplified circuit has two difference output ends, its in the same way output link to each other with the input of under-voltage control circuit (3), its inverse output terminal links to each other with the input control end of Low-voltage Electronic switching circuit (2); Relatively be provided with reference voltage in the amplifying circuit (4), relatively amplifying circuit (4) relatively amplifies back output control level with the voltage swing on the current sampling resistor and reference voltage and Low-voltage Electronic switching circuit (2) is carried out switch controls, when the voltage of current sampling resistor during greater than reference voltage, Low-voltage Electronic switching circuit (2) inserts the LED load unit, when the voltage of current sampling resistor during less than reference voltage, Low-voltage Electronic switching circuit (2) is with LED load unit short circuit;
Voltage stabilizing circuit (1) is by triode Q15, triode Q16, and triode Q14, triode Q17, triode Q18, triode Q19, triode Q20, triode Q21 and resistance R 4 are formed; Wherein the emitter of triode Q15 all links to each other with the positive power source terminal of integrated circuit with the emitter of triode Q16 and with the collector electrode of triode Q14; The collector electrode of the base stage of the base stage of triode Q15, triode Q16 and triode Q16 links to each other with an end of resistance R 4, and the other end of resistance R 4 links to each other with the zero potential reference edge of integrated circuit; The collector electrode of triode Q15 is connected with triode Q17 collector electrode with the base stage of triode Q14, the base stage of triode Q17; The base stage of the emitter of triode Q17, triode Q18 and triode Q18 collector electrode are connected; The emitter of triode Q18 links to each other with triode Q19 collector electrode with the base stage of triode Q19 respectively; The emitter of triode Q19 links to each other with triode Q20 collector electrode with the base stage of triode Q20 respectively; The emitter of triode Q20 is connected with triode Q21 collector electrode with the base stage of triode Q21 respectively; The emitter of triode Q21 is connected with the zero potential reference edge; Wherein, triode Q15 and triode Q16 are the positive-negative-positive triode, and triode Q14, triode Q17, triode Q18, triode Q19, triode Q20 and triode Q21 are NPN type triode;
Low-voltage Electronic switching circuit (2) is made up of triode Q23, triode Q25, triode Q26 and triode Q27; Wherein the emitter of triode Q23 links to each other with the zero potential reference edge, and the collector electrode of triode Q23 links to each other with the collector electrode of triode Q25 and the base stage of triode Q26 respectively; The collector electrode of the collector electrode of the emitter of triode Q25, triode Q26 and triode Q27 links to each other with positive power source terminal jointly; The emitter of triode Q26 links to each other with the base stage of triode Q27, and the emitter of triode Q27 links to each other with the public end of Low-voltage Electronic switch with current sample; Wherein, triode Q25 is the triode of positive-negative-positive, and triode Q23, triode Q26 and triode Q27 are the triode of NPN type;
Under-voltage control circuit (3) is made of triode Q24 and triode Q22; Wherein the emitter of triode Q24 links to each other with positive supply, and the collector electrode of the base stage of triode Q24, triode Q24 and the collector electrode of triode Q22 interconnect, and the emitter of triode Q22 links to each other with the zero potential reference edge; Wherein, triode Q24 is the positive-negative-positive triode, and triode Q22 is NPN type triode;
Relatively amplifying circuit (4) is made of triode Q1, triode Q2, triode Q3, triode Q4, triode Q10, triode Q11, triode Q5, triode Q6, triode Q7, triode Q8, triode Q9, triode Q12, triode Q13, resistance R 1, resistance R 2, resistance R 3 and resistance R 5; Wherein, an end of the collector electrode of the base stage triode Q10 of the base stage of the base stage of the base stage of triode Q1, triode Q2, triode Q11, triode Q10 and resistance R 3 links to each other; The other end of resistance R 3 links to each other with the collector electrode of triode Q9, the base stage of triode Q9 respectively; The emitter of the emitter of the collector electrode of the collector electrode of triode Q1, triode Q2, triode Q3 and triode Q4 interconnects; One end of the collector electrode of the base stage of triode Q3, triode Q5 and resistance R 1 links to each other; The collector electrode of triode Q3 links to each other with the zero potential reference edge; One end of the collector electrode of the base stage of triode Q4, triode Q6 and resistance R 2 interconnects and connects; The collector electrode of the collector electrode of the emitter of the emitter of triode Q5, triode Q6, triode Q7 and triode Q8 interconnects; The base stage of the collector electrode of the collector electrode of the base stage of triode Q5, triode Q11, triode Q12 and triode Q12 interconnects; The base stage of the collector electrode of the emitter of triode Q12, triode Q13 and triode Q13 interconnects; The base stage of triode Q6 links to each other with an end of resistance R 5, the other end of resistance R 5 links to each other with the public end of Low-voltage Electronic switch with current sample; The base stage of the base stage of the base stage of triode Q7, triode Q8, triode Q9 interconnects; The emitter of the emitter of the emitter of the emitter of triode Q13, triode Q7, triode Q8, triode Q9 links to each other with the zero potential reference edge; Wherein, triode Q1, triode Q2, triode Q3, triode Q4, triode Q10 and triode Q11 are the triode of positive-negative-positive, and triode Q5, triode Q6, triode Q7, triode Q8, triode Q9, triode Q12, triode Q13 are the triode of NPN type;
Connected mode is between above-mentioned four functional circuits: the emitter that plays the triode Q14 of voltage stabilizing output action in the voltage stabilizing circuit (1) is voltage stabilizing output, the emitter of the emitter of the triode Q1 in the emitter of triode Q14 and the amplifying circuit (4) relatively, the emitter of triode Q2, triode Q10 and, the emitter of triode Q11, the other end of resistance R 1, the other end of resistance R 2 interconnect; The base stage of the triode Q22 that the base stage of triode Q21 in the voltage stabilizing circuit (1) and the node of collector electrode short circuit and under-voltage control circuit (3) are interior links to each other; Relatively the base stage of the interior triode Q23 of the collector electrode of the triode Q4 in the amplifying circuit (4) and low tension switch control circuit (2) links to each other; Relatively the other end of the resistance R 5 of amplifying circuit (4) links to each other with the public end of Low-voltage Electronic switch with the emitter of the triode Q27 of low voltage switching circuit (2) and with current sample, and the base stage of the triode Q24 in the under-voltage control circuit (3) is connected with emitter afterwards and links to each other with the base stage of the interior triode Q25 of Low-voltage Electronic switching circuit (2).
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| CN 201320215188 CN203219579U (en) | 2013-04-25 | 2013-04-25 | Alternating current directly driving LED integrated circuit for low voltage bypass power taking |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014173200A1 (en) * | 2013-04-25 | 2014-10-30 | 合肥云杉光电科技有限公司 | Integrated circuit, and method of taking electric power from low voltage bypass for alternating current directly driven led |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014173200A1 (en) * | 2013-04-25 | 2014-10-30 | 合肥云杉光电科技有限公司 | Integrated circuit, and method of taking electric power from low voltage bypass for alternating current directly driven led |
| US9301355B2 (en) | 2013-04-25 | 2016-03-29 | Hefei Spruce Optoelectronic Technology Co., Ltd. | Method of taking power with low-voltage bypass by integrated circuit for AC direct driving LEDs and the integrated circuit |
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