CN203120227U - LED (light emitting diode) AC direct driving circuit controlled by multi-channel low voltage switching circuit - Google Patents
LED (light emitting diode) AC direct driving circuit controlled by multi-channel low voltage switching circuit Download PDFInfo
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- CN203120227U CN203120227U CN 201320000768 CN201320000768U CN203120227U CN 203120227 U CN203120227 U CN 203120227U CN 201320000768 CN201320000768 CN 201320000768 CN 201320000768 U CN201320000768 U CN 201320000768U CN 203120227 U CN203120227 U CN 203120227U
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Abstract
The utility model provides an LED (light emitting diode) AC direct driving circuit controlled by a multi-channel low voltage switching circuit. The key technology is that a multi-channel common ground high voltage switching circuit is replaced by the low voltage switching circuit with a multi-channel non-common ground series structure, thereby realizing the LED AC direct driving circuit controlled by the multi-channel low voltage switching circuit. Different from the prior art, the LED AC direct driving circuit does not need to use a plurality of high-voltage and high-power MOSs (metal oxide semiconductors) or bipolar transistors to act as switching transistors, and the high-voltage and high-power MOSs or the bipolar transistors are all replaced by low voltage switching transistors. The multi-channel low voltage switching circuit provided by the utility model is low in operating voltage, does not need to use the high-voltage and high-power switching transistors, and has the characteristics of high reliability, good performance, simple circuit, low cost, convenience for integration and the like.
Description
Technical field
The utility model belongs to electronic circuit field, is that a kind of LED of novel multichannel low voltage switching circuit control exchanges direct drive circuit.
Background technology
Light-emitting diode (LED) is the new generation of semiconductor luminescent device, and it has characteristics such as light efficiency height, life-span length and environmental protection and energy saving, uses very extensive.The LED driving power is the important component part of LED illumination, and LED exchanges extremely people's attention of direct driving technologies.The technical problem underlying that LED interchange at present directly drives is its poor performance, cost height.Its basic reason is that prior art all is the multichannel high-power electronic switching circuit altogether that adopts, and the cost high reliability is poor.
The LED that the utility model provides a kind of novel multichannel low voltage switching circuit to control exchanges direct drive circuit, its key technology is to utilize multichannel that the low voltage switching circuit of the non-cascaded structure altogether of multichannel substitutes prior art high voltage switch circuit altogether, the ac high-voltage of realizing the control of multichannel low voltage switching circuit directly drives LED, different with prior art is, the utility model does not need to use a plurality of high-power MOS or bipolar transistor as switching tube, and all replaced by the low tension switch transistor, multi-way switch circuit operating voltage of the present utility model is low, need not to use the high voltage switch transistor, have the reliability height, performance is good, cost is low and be convenient to characteristics such as integrated.
The utility model content
The LED that the utility model provides a kind of novel multichannel low voltage switching circuit to control exchanges direct drive circuit, its key technology is to utilize multichannel that the low voltage switching circuit of the non-cascaded structure altogether of multichannel substitutes prior art high voltage switch circuit altogether, the LED that realizes the control of multichannel low voltage switching circuit exchanges direct drive circuit, different with prior art is, the utility model does not need to use a plurality of high-power MOS or bipolar transistor as switching tube, and all replaced by the low tension switch transistor, multi-way switch circuit operating voltage of the present utility model is low, need not to use the high voltage switch transistor, have the reliability height, performance is good, cost is low and be convenient to characteristics such as integrated.
The technical solution of the utility model is as follows:
The LED of multichannel low voltage switching circuit control exchanges direct drive circuit; Comprise full-wave rectifying circuit, ballasting circuit, high pressure buffer circuit, multichannel low voltage switching circuit, more piece LED series unit etc., full-wave rectifying circuit carries out the ac high-voltage of input to obtain forward interchange pulsation transient voltage after the full-wave rectification, the positive output end of full-wave rectifying circuit links to each other with an end of ballasting circuit, also links to each other with the high pressure buffer circuit; With the LED series aiding connection of some, its head end positive pole links to each other with the other end of ballasting circuit, and its tail end negative pole links to each other with the negative output terminal of full-wave rectifying circuit.Each road low voltage switching circuit comprises voltage sample input, current sample input, positive output control end and negative output control end.The LED of the series aiding connection of above-mentioned some is divided into more piece LED series unit, the head end positive pole of each joint LED series unit links to each other with the positive output control end of a road corresponding low voltage switching circuit, and the tail end negative pole of each joint LED series unit links to each other with the negative output control end of a road corresponding low voltage switching circuit.The voltage sample input of each road low voltage switching circuit links to each other with the high pressure buffer circuit, and the current sample input of each road low voltage switching circuit links to each other with the tail end negative pole of a corresponding joint LED series unit.
The multichannel low voltage switching circuit all is the Low-voltage Electronic circuit, its actual operating voltage is not higher than tens volts, the multichannel low voltage switching circuit all is the non-mode that is connected in series altogether, and the joint LED series unit that each road low voltage switching circuit control is corresponding is with its access or short circuit.
The structure of multichannel low voltage switching circuit is made up of input voltage sample circuit, output LED drive current sample circuit, comparison amplifying circuit, reference voltage circuit, stabilized voltage power supply and electronic switch.
The multichannel low voltage switching circuit can constitute with discrete component, also can constitute with universal integrated circuit, also can make application-specific integrated circuit (ASIC).
Use the series system of multichannel low voltage switching circuit, realize ac high-voltage to the direct driving of LED, and in whole drive circuit, do not need to use high-power MOS or bipolar transistor more than the hectovolt.
Description of drawings
Fig. 1 exchanges the structural representation of direct drive circuit for the LED of multichannel low voltage switching circuit control of the present utility model.
Fig. 2 exchanges direct drive circuit figure for the LED of 12 road low voltage switching circuits control of a kind of input voltage sampled form of the present utility model.
Fig. 3 exchanges direct drive circuit figure for the LED of 12 road low voltage switching circuits control of a kind of LED of output drive current sampled form 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, exchange the structural representation of direct drive circuit for the LED of multichannel low voltage switching circuit control of the present utility model.
The LED of multichannel low voltage switching circuit control exchanges direct drive circuit; Comprise full-wave rectifying circuit, ballasting circuit, high pressure buffer circuit, N road low voltage switching circuit, N joint LED series unit etc., full-wave rectifying circuit carries out the ac high-voltage of input to obtain forward interchange pulsation transient voltage after the full-wave rectification, the positive output end of full-wave rectifying circuit links to each other with an end of ballasting circuit, also links to each other with the high pressure buffer circuit; With M LED series aiding connection, its head end positive pole links to each other with the other end of ballasting circuit, and its tail end negative pole links to each other with the negative output terminal of full-wave rectifying circuit.Each road low voltage switching circuit comprises voltage sample input, current sample input, positive output control end and negative output control end.The LED of M series aiding connection is divided into N joint LED series unit, the head end positive pole of each joint LED series unit links to each other with the positive output control end of a road corresponding low voltage switching circuit, and the tail end negative pole of each joint LED series unit links to each other with the negative output control end of a road corresponding low voltage switching circuit.The voltage sample input of each road low voltage switching circuit links to each other with the high pressure buffer circuit, and the current sample input of each road low voltage switching circuit links to each other with the tail end negative pole of a corresponding joint LED series unit.M LED series aiding connection, the value of M is about the integer value of Vpm/Vd, and wherein Vpm is the peak value of high input ac voltage, for example for 185 ~ 265 volts AC-input voltage, Vpm=265 *
360 volts of ≈, Vd are the forward conduction voltage of LED, are about 3.0 volts, general M ≈ 120.N joint LED series unit, the value of N gets 4 ~ 40 usually.
What ballasting circuit used is powerful steady resistance, also can use the normal conducting LED of some.What the high pressure buffer circuit used is the power resistor of big resistance.The multichannel low voltage switching circuit all is the Low-voltage Electronic circuit, its actual operating voltage V
DDBe not higher than tens volts, V
DD=Vpm/N for example for 265 volts the highest AC-input voltage, gets N=4, then V
DD=90 volts; Get N=12, then V
DD=30 volts, get N=40, then V
DD=9 volts.
Embodiment 2
The LED that is illustrated in figure 2 as 12 road low voltage switching circuits control of a kind of input ac voltage sampled form of the present utility model exchanges direct drive circuit figure.Wherein rectifier diode d1 ~ d4 form small-power control transistor, r1 ~ r12 that low tension switch transistor, Q1 ~ Q12 that full-wave rectifying circuit, power resistor Z1 be respectively 12 road low voltage switching circuits as ballasting circuit, T1 ~ T12 be respectively 12 road low voltage switching circuits be respectively the transistorized biasing resistor of low tension switch, R1 ~ R12 be current-limiting resistance, D1 ~ D12 be voltage stabilizing didoe, Z2 for biasing pressure limiting resistance, d5 are that crest voltage sampling diode, C1 are that integration storage capacitor, Z3 are the high pressure isolation resistance of voltage sample, form the high pressure buffer circuit.
As shown in Figure 2, low tension switch transistor T 1, small-power control transistor Q1, biasing resistor r1, current-limiting resistance R1, voltage stabilizing didoe D1 etc. constitute first via low voltage switching circuit, finish first segment LED series unit is inserted or the control of the switch of short circuit, have 12 road low voltage switching circuits among the figure, respectively 12 joint LED series units are inserted or short circuit control.
Among the embodiment, concrete parameter is as follows:
AC-input voltage is 50 hertz 185 ~ 265 volts AC-input voltage, obtain 100 hertz pulsation transient voltage through behind the full-wave rectifying circuit, its peak value Vpm is about 360 volts, 120 LED series aiding connections, be divided into 12 joint LED series units, every joint unit comprises the LED of 10 series connection.Rectifier diode d1 ~ d4 model is 1N4007, steady resistance Z1 resistance is 10 ohm of 2W, it is NID5003NT4G that withstand voltage 42 couchers of low tension switch transistor T 1 ~ T12 are made 20 amperes of models of electric current, Q1 ~ the Q12 model is 9018 to small-power control transistor, biasing resistor r1 ~ r12 resistance is 0.5 watt of 1M ohm power, current-limiting resistance R1 ~ R12 model is 0.5 watt of 1M ohm power, voltage stabilizing didoe D1 ~ 30 volts of models of D12 conducting voltage are 1N4751, the resistance of biasing pressure limiting resistance Z2 is 1 watt of 1M ohm power, crest voltage sampling diode d5 model is FR107, integration storage capacitor C1 model is the X electric capacity of 0.1uF, high pressure isolation resistance Z3 resistance is 1 watt of 1M ohm power, and the LED specification is the 1W white light LEDs of operating current 350mA.The maximum operating voltage V of each road low voltage switching circuit
DDBe V
DD=Vpm/N=360/12=30 volt.
Embodiment 3
As shown in Figure 3, the LED that controls for 12 road low voltage switching circuits of a kind of LED of output drive current sampled form of the present utility model exchanges direct drive circuit figure.Wherein rectifier diode d1 ~ d4 forms full-wave rectifying circuit, power resistor Z1 is as ballasting circuit, T1 ~ T12 is respectively the low tension switch transistor of 12 road low voltage switching circuits, r1 ~ r12 is respectively the transistorized biasing resistor of low tension switch, R1 ~ R12 is output LED drive current sampling resistor, A1 ~ A12 is respectively the comparison amplifying circuit of 12 road low voltage switching circuits, Vref1 ~ Vref12 is reference voltage circuit, Q1 ~ Q12 is respectively switch control low-power transistor, resistance Y1 ~ Y12 is respectively current-limiting resistance, d5 is crest voltage sampling diode, C1 is the integration storage capacitor, Z2 is biasing pressure limiting resistance.
Wherein d1 ~ d4 forms full-wave rectifying circuit, power resistor Z1 is that steady resistance, T1 ~ T12 are respectively that the low tension switch transistor of 12 road low voltage switching circuits, the transistorized biasing resistor of low tension switch, the R1 ~ R12 that resistance r1 ~ r12 is 12 road low voltage switching circuits respectively are that crest voltage sampling resistor, C1 are that integration storage capacitor, Z2 are biasing pressure limiting resistance for output LED drive current sampling resistor, d5.
As shown in Figure 3, low tension switch transistor T 1, relatively amplifying circuit A1, voltage reference circuit Vref1, small-power control transistor Q1, output LED drive current sampling resistor R1, biasing resistor r1, current-limiting resistance Y1 etc. constitute first via low voltage switching circuits, finish first segment LED series unit is inserted or the switch control of short circuit.Have 12 road low voltage switching circuits among the figure, respectively 12 joint LED series units are inserted or short circuit control.
Among the embodiment, concrete parameter is as follows:
AC-input voltage is 50 hertz 185 ~ 265 volts AC-input voltage, obtain 100 hertz pulsation transient voltage through behind the full-wave rectifying circuit, its peak value Vpm is about 360 volts, 120 LED series aiding connections, be divided into 12 joint LED series units, every joint unit comprises the LED of 10 series connection.Rectifier diode d1 ~ d4 model is 1N4007, steady resistance Z1 resistance is 10 ohm of 2W, it is NID5003NT4G that withstand voltage 42 couchers of low tension switch transistor T 1 ~ T12 are made 20 amperes of models of electric current, Q1 ~ the Q12 model is 9018 to small-power control transistor, biasing resistor r1 ~ r12 resistance is 0.5 watt of 1M ohm power, R1 ~ the R12 model is that 0.5 watt of resistance of power is respectively 12 to output LED drive current sampling resistor, 11,10,9,8,7,6,5,4,3,2,1 ohm, relatively A1 ~ the A12 model is application-specific integrated circuit (ASIC) KD1202 to amplifying circuit, reference voltage circuit Vref1 ~ Vref12 is for providing the application-specific integrated circuit (ASIC) of reference voltage 0.35V, current-limiting resistance Y1 ~ Y12 resistance is 100K ohm 0.5W, crest voltage sampling diode d5 model is FR107, integration storage capacitor C1 model is the X electric capacity of 0.1uF, biasing pressure limiting resistance Z2 resistance is 1 watt of 1M ohm power, and the LED specification is the 1W white light LEDs of operating current 350mA.The maximum operating voltage V of each road low voltage switching circuit
DDBe V
DD=Vpm/N=360/12=30 volt.
The technical parameter of embodiment 3 is: 185 ~ 265 volts of input ac voltage scopes, driving power efficient greater than 90%, power factor is greater than 0.9.
Claims (4)
1. the LED of multichannel low voltage switching circuit control exchanges direct drive circuit; Comprise full-wave rectifying circuit, ballasting circuit, high pressure buffer circuit, multichannel low voltage switching circuit, more piece LED series unit etc., it is characterized in that: full-wave rectifying circuit carries out the ac high-voltage of input to obtain forward interchange pulsation transient voltage after the full-wave rectification, the positive output end of full-wave rectifying circuit links to each other with an end of ballasting circuit, also links to each other with the high pressure buffer circuit; With the LED series aiding connection of some, its head end positive pole links to each other with the other end of ballasting circuit, and its tail end negative pole links to each other with the negative output terminal of full-wave rectifying circuit;
Each road low voltage switching circuit comprises voltage sample input, current sample input, positive output control end and negative output control end;
The LED of the series aiding connection of above-mentioned some is divided into more piece LED series unit, the head end positive pole of each joint LED series unit links to each other with the positive output control end of a road corresponding low voltage switching circuit, and the tail end negative pole of each joint LED series unit links to each other with the negative output control end of a road corresponding low voltage switching circuit;
The voltage sample input of each road low voltage switching circuit links to each other with the high pressure buffer circuit, and the current sample input of each road low voltage switching circuit links to each other with the tail end negative pole of a corresponding joint LED series unit.
2. the LED of multichannel low voltage switching circuit control according to claim 1 exchanges direct drive circuit; Be further characterized in that: the multichannel low voltage switching circuit all is the Low-voltage Electronic circuit, its actual operating voltage is not higher than tens volts, the multichannel low voltage switching circuit all is the non-mode that is connected in series altogether, and the joint LED series unit that each road low voltage switching circuit control is corresponding is with its access or short circuit.
3. the LED of multichannel low voltage switching circuit control according to claim 1 exchanges direct drive circuit, is further characterized in that: the structure of multichannel low voltage switching circuit is made up of input voltage sample circuit, output LED drive current sample circuit, comparison amplifying circuit, reference voltage circuit, stabilized voltage power supply and electronic switch.
4. the LED of multichannel low voltage switching circuit control according to claim 1 exchanges direct drive circuit, be further characterized in that: the multichannel low voltage switching circuit can constitute with discrete component, also can constitute with universal integrated circuit, also can make application-specific integrated circuit (ASIC).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320000768 CN203120227U (en) | 2013-01-05 | 2013-01-05 | LED (light emitting diode) AC direct driving circuit controlled by multi-channel low voltage switching circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320000768 CN203120227U (en) | 2013-01-05 | 2013-01-05 | LED (light emitting diode) AC direct driving circuit controlled by multi-channel low voltage switching circuit |
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| Publication Number | Publication Date |
|---|---|
| CN203120227U true CN203120227U (en) | 2013-08-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320000768 Expired - Lifetime CN203120227U (en) | 2013-01-05 | 2013-01-05 | LED (light emitting diode) AC direct driving circuit controlled by multi-channel low voltage switching circuit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103716968A (en) * | 2014-01-09 | 2014-04-09 | 合肥云杉光电科技有限公司 | Road illumination method with direct-current high-voltage direct-driven LEDs converted through three-phase alternating current electric supply |
| 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 |
-
2013
- 2013-01-05 CN CN 201320000768 patent/CN203120227U/en not_active Expired - Lifetime
Cited By (3)
| 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 |
| CN103716968A (en) * | 2014-01-09 | 2014-04-09 | 合肥云杉光电科技有限公司 | Road illumination method with direct-current high-voltage direct-driven LEDs converted through three-phase alternating current electric supply |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130807 |