CN103826366A - High-voltage LED driving circuit capable of working under full voltages - Google Patents
High-voltage LED driving circuit capable of working under full voltages Download PDFInfo
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- CN103826366A CN103826366A CN201410062803.XA CN201410062803A CN103826366A CN 103826366 A CN103826366 A CN 103826366A CN 201410062803 A CN201410062803 A CN 201410062803A CN 103826366 A CN103826366 A CN 103826366A
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Abstract
The invention provides a high-voltage LED driving circuit capable of working under full voltages. The circuit comprises at least two groups of LED units, a line voltage detecting unit, a series-parallel switching control unit, a rectification output unit and a driving unit. Each group of LED units comprise a plurality of high-voltage LEDs and a plurality of switch tubes. The line voltage detecting unit is used for outputting series-parallel control signals based on power supply voltages. The series-parallel switching control unit is used for controlling series-paralleling connecting of the groups of LED units based on the series-parallel control signals. The rectification output unit is used for converting an accessed power supply into voltages needed by the LED units. The driving unit is used for controlling turning on and off of the switch tubes and currents of the high-voltage LEDs in the groups of LED units based on the output voltages of a rectification output circuit. Accordingly, the high-voltage LEDs can be driven at the low voltages of 110 V and the high voltages of 220 V.
Description
Technical field
The present invention relates to the drive circuit of high-voltage LED, particularly relate to a kind of high-voltage LED driving circuit that can be operated under full voltage.
Background technology
High-voltage LED is a kind of high-capacity LED, is formed by multiple low-power LED series connection, and the basic demand of its luminous efficiency reaches 100lm/W.Along with the development of high-voltage LED technology, more and more illuminating devices start to adopt high-voltage LED.
Existing high-voltage LED driving circuit is a kind of drive scheme of linearity, for example, drive the drive scheme (being ACHVLED drive scheme) of high-voltage LED etc. based on AC power, the electric circuit characteristic of this kind of scheme is that circuit is simple, High Power Factor, low harmonic wave, and higher in narrow input voltage range internal efficiency, and drive circuit and LED light source module are easily realized integrated production, but this kind of scheme can only be operated in narrow input voltage range, be generally in the scope of +/-15% of rated operational voltage, so the product of ACHV can only be divided into the version that high low-voltage is different at present.
For example, in the Chinese patent application document that is 201210543926.6 at application number, the constant current that discloses a kind of 110V tunable optical drives high-voltage LED circuit.This constant current drives high-voltage LED circuit to comprise: rectifier circuit, constant-current circuit and LED load circuit, wherein, rectifier circuit is sent into constant-current circuit after access 110V AC rectification is converted to direct current, then provides constant current with the each LED load in driving LED load circuit by constant-current circuit to LED load circuit.This LED circuit drive circuit can only be operated under 110V alternating voltage.
Again for example, in the Chinese patent application document that is 201210545511.2 at application number, the constant current that discloses a kind of 220V tunable optical drives high-voltage LED circuit.This constant current drives high-voltage LED circuit to comprise: rectifier circuit, constant-current circuit and LED load circuit, wherein, rectifier circuit is sent into constant-current circuit after access 220V AC rectification is converted to direct current, then provides constant current with the each LED load in driving LED load circuit by constant-current circuit to LED load circuit.This LED circuit drive circuit can only be operated under 220V alternating voltage.
Because existing high-voltage LED driving circuit can not move under full voltage, bring very big inconvenience to user thus, therefore, urgent need will be improved existing high-voltage LED driving circuit.
Summary of the invention
The shortcoming of prior art in view of the above, the object of the present invention is to provide a kind of high-voltage LED driving circuit that can be operated under full voltage, can under 110V low-voltage, work to realize a kind of high-voltage LED driving circuit, also can under 220V high voltage, work.
For achieving the above object and other relevant objects, the invention provides a kind of high-voltage LED driving circuit that can be operated under full voltage, it at least comprises:
At least two group LED unit, each group comprises multiple high-voltage LEDs and multiple switching tube;
Line voltage detection unit, for coming output string control signal based on supply voltage;
String switch control unit, for controlling string the connection of each group of LED unit based on described string control signal;
The rectification output unit that comprises input protection circuit, for being converted to the power supply of access LED unit required voltage;
Driver element, for the output voltage based on rectifying output circuit control each group LED unit the switching of each switching tube and the electric current of each high-voltage LED.
Preferably, described rectification output unit comprises current rectifying and wave filtering circuit, to the AC power of access is carried out to rectifying and wave-filtering.
As mentioned above, the high-voltage LED driving circuit that can be operated under full voltage of the present invention, has following beneficial effect: can under 110V low-voltage, work, also can under 220V high voltage, work.
Accompanying drawing explanation
Fig. 1 is shown as the high-voltage LED driving circuit schematic diagram that can be operated under full voltage of the present invention.
Fig. 2 a is shown as two groups of LED unit that can be operated in the high-voltage LED driving circuit under full voltage of the present invention schematic diagram that is connected in parallel.
Fig. 2 b is shown as two groups of LED units in series connection diagrams that can be operated in the high-voltage LED driving circuit under full voltage of the present invention.
Element numbers explanation
1 high-voltage LED driving circuit
11 LED unit
12 line voltage detection units
13 string switch control units
14 rectification output units
15 driver elements
151,152 application-specific integrated circuit (ASIC)s
Embodiment
By particular specific embodiment explanation embodiments of the present invention, person skilled in the art scholar can understand other advantages of the present invention and effect easily by the disclosed content of this specification below.
Refer to Fig. 1 to Fig. 2 b.Notice, appended graphic the illustrated structure of this specification, ratio, size etc., all contents in order to coordinate specification to disclose only, understand and read for person skilled in the art scholar, not in order to limit the enforceable qualifications of the present invention, therefore the not technical essential meaning of tool, the adjustment of the modification of any structure, the change of proportionate relationship or size, not affecting under effect that the present invention can produce and the object that can reach, all should still drop on disclosed technology contents and obtain in the scope that can contain.Simultaneously, in this specification, quote as " on ", the term of D score, " left side ", " right side ", " centre " and " " etc., also only for ease of understanding of narrating, but not in order to limit the enforceable scope of the present invention, the change of its relativeness or adjustment, changing under technology contents, when being also considered as the enforceable category of the present invention without essence.
As shown in the figure, the invention provides a kind of high-voltage LED driving circuit that can be operated under full voltage.Described high-voltage LED driving circuit 1 at least comprises: at least two group LED unit 11, line voltage detection unit 12, string switch control unit 13, rectification output unit 14 and driver element 15.
Each group in described at least two group LED unit 11 all comprises multiple high-voltage LEDs and multiple switching tube.
For example, as shown in Figure 1, this high-voltage LED driving circuit 1 comprises 2 groups of LED unit 11, and wherein, Yi ZuLED unit, the left side comprises 4 high-voltage LEDs and 4 switching tubes, i.e. LED1, LED2, LED3 and LED4, switching tube Q1, Q2, Q3 and Q4; One group of LED unit, the right also comprises 4 high-voltage LEDs and 4 switching tubes, i.e. LED5, LED6, LED7 and LED8, switching tube Q5, Q6, Q7 and Q8.
It should be noted that, above-mentioned each high-voltage LED can be a single LED particle, can be also the combination LED particle being formed by the connection in series-parallel of multiple LED particle.
Described line voltage detection unit 12 comes output string control signal based on supply voltage.
Particularly, in the time that the supply voltage of access is 110V interchange or DC power supply, described line voltage detection unit 12 output-parallel control signals; In the time that the supply voltage of access is 220V interchange or DC power supply, described line voltage detection unit 12 output strings connection control signals.
Preferably, described line voltage detection unit 12 can build based on resistance capacitance.
For example, as shown in Figure 1, this line voltage detection unit 12 comprises the filter circuit that resistance R 9, R10, R11 and the capacitor C 1 of series connection form.
It should be noted that, this line voltage detection unit also can directly connect supply voltage incoming end.
Described string switch control unit 13 are controlled string the connection of each group of LED unit based on described string control signal.
Preferably, described string switch control unit 13 can build based on resistance, triode, voltage-stabiliser tube, diode and switching tube.
For example, as shown in Figure 1, this string switch control unit 13 comprise: resistance R 12, R13,, R15, R16, R18, R19, triode Q9, voltage-stabiliser tube ZD1, ZD2, diode D1, D2, D3, D4, switching tube Q10, Q11, the connected mode of each element as shown in Figure 1, is not described in detail in this.
The course of work of above-mentioned string switch control unit 13 is as follows:
In the time that the power supply of access is low-voltage input (being 110V), line voltage detection unit 12 output-parallel control signals, make not conducting of triode Q9, switching tube Q10 and Q11 conducting, the current potential that now B is ordered is no matter always how input voltage changes the current potential of ordering higher than C, so diode D1 cut-off; Since the conducting of switching tube Q10, and move D point to ground, the current potential that therefore D is ordered is 0V, and E point position is greater than D point current potential, so diode D2 cut-off, now two groups of LED unit are connected in parallel, equivalent electric circuit is as shown in Figure 2 a.
In the time that the power supply of access is high voltage input (being 220V), line voltage detection unit 12 output string connection control signals, make triode Q9 conducting, thereby being dragged down, switching tube Q10 and Q11 grid level end, due to switching tube Q11 cut-off, electric current will flow into one group of LED unit, the right from Yi ZuLED unit, the left side by diode D1 automatically; Due to switching tube Q10 cut-off, the electric current returning will flow into Yi ZuLED unit, the left side by diode D2 automatically, and now one group, the right LED cell operation is at the state on floating ground, and now two groups of LED units in series connect, and equivalent electric circuit as shown in Figure 2 b.
Described rectification output unit 14 comprises input protection circuit, and its power supply by access is converted to LED unit required voltage.Wherein, access point power supply can be DC power supply, can be also AC power, for example, and 110V AC power or 220V AC power etc.
Wherein, input protection circuit is for effectively protecting the late-class circuit of access, and it comprises over-voltage over-current protection etc.
Described rectification output unit 14 comprises current rectifying and wave filtering circuit, during as AC power, by current rectifying and wave filtering circuit, this AC power is converted to LED unit required voltage take the power supply of box lunch access.
Based on foregoing description, those skilled in the art should know the internal structure of described rectification output unit 14, therefore be not described in detail in this.
The output voltage of described driver element 15 based on rectification output unit 14 controlled the switching of each switching tube and the electric current of each high-voltage LED in each group LED unit.
Preferably, described driver element 15 comprises application-specific integrated circuit (ASIC) and current sense resistor.Wherein, the output voltage of described application-specific integrated circuit (ASIC) based on rectifying output circuit 14 carrys out output switch pipe control signal.
For example, as shown in Figure 1, described driver element 15 comprises that application-specific integrated circuit (ASIC) 151,152(are U1, U2) and current sense resistor R1 to R8, its engineering process is as follows:
In the time that two groups of LED unit are connected in parallel, if the all-wave voltage of the current rectifying and wave filtering circuit of rectification output unit 14 output is while rising to the forward conduction voltage drop (VF1) of high-voltage LED 1 from 0V, application-specific integrated circuit (ASIC) 151 control switch pipe Q1 conductings it flows through the electric current of LED1 by current sense resistor control; In the time that all-wave voltage continues to rise to VF1+VF2, application-specific integrated circuit (ASIC) 151 control switch pipe Q2 conductings, switching tube Q1 turn-off; In the time that all-wave voltage continues to rise to VF1+VF2+VF3, application-specific integrated circuit (ASIC) 151 control switch pipe Q3 conductings, switching tube Q2, Q1 turn-off; In the time that all-wave voltage continues to rise to VF1+VF2+VF3+VF4, application-specific integrated circuit (ASIC) 151 control switch pipe Q4 conductings, switching tube Q3, Q2, Q1 turn-off; The process that all-wave voltage drops to 0V from peak value is the reverse process of above process, is not described in detail in this.
In addition, all-wave voltage rises to the stage of peak value and is dropped to for 0 stage by peak value from 0V, application-specific integrated circuit (ASIC) 152 is similar to the control mode of application-specific integrated circuit (ASIC) 151 control switch pipe Q1 to Q4 to the control mode of switching tube Q5 to Q8, that is: in the time that all-wave voltage rises to the forward conduction voltage drop (VF5) of high-voltage LED 5 from 0V, application-specific integrated circuit (ASIC) 152 control switch pipe Q5 conductings; In the time that all-wave voltage continues to rise to VF5+VF6, application-specific integrated circuit (ASIC) 152 control switch pipe Q6 conductings, switching tube Q5 turn-off; In the time that all-wave voltage continues to rise to VF5+VF6+VF7, application-specific integrated circuit (ASIC) 152 control switch pipe switching tube Q7 conductings, switching tube Q6, Q5 turn-off; In the time that all-wave voltage continues to rise to VF5+VF6+VF7+VF8, application-specific integrated circuit (ASIC) 152 control switch pipe Q8 conductings, switching tube Q5, Q6, Q7 turn-off.In the time that two groups of LED units in series connect, if the all-wave voltage of the current rectifying and wave filtering circuit of rectification output unit 14 output is while rising to the forward conduction voltage drop (VF1) of high-voltage LED 1 from 0V, application-specific integrated circuit (ASIC) 151 control switch pipe Q1 conductings it flows through the electric current of LED1 by current sense resistor control; In the time that all-wave voltage continues to rise to VF1+VF2, application-specific integrated circuit (ASIC) 151 control switch pipe Q2 conductings, switching tube Q1 turn-off; In the time that all-wave voltage continues to rise to VF1+VF2+VF3, application-specific integrated circuit (ASIC) 151 control switch pipe Q3 conductings, switching tube Q2, Q1 turn-off; In the time that all-wave voltage continues to rise to VF1+VF2+VF3+VF4, application-specific integrated circuit (ASIC) 151 control switch pipe Q4 conductings, switching tube Q3, Q2, Q1 turn-off; In the time that all-wave voltage rises to VF1+VF2+VF3+VF4+VD1+VF5, application-specific integrated circuit (ASIC) 152 control switch pipe Q5 conductings, application-specific integrated circuit (ASIC) 151 control switch pipe Q1, Q2, Q3, Q4 turn-off; In the time that all-wave voltage continues to rise to VF1+VF2+VF3+VF4+VD1+VF5+VF6, application-specific integrated circuit (ASIC) 152 control switch pipe Q6 conductings, switching tube Q5 turn-off, and application-specific integrated circuit (ASIC) 151 control switch pipe Q1, Q2, Q3, Q4 turn-off; In the time that all-wave voltage continues to rise to VF1+VF2+VF3+VF4+VD1+VF5+VF6+VF7, application-specific integrated circuit (ASIC) 152 control switch pipe Q7 conductings, switching tube Q5, Q6 turn-off, and application-specific integrated circuit (ASIC) 151 control switch pipe Q1, Q2, Q3, Q4 turn-off; In the time that all-wave voltage continues to rise to VF1+VF2+VF3+VF4+VD1+VF5+VF6+VF7+VF8, application-specific integrated circuit (ASIC) 152 control switch pipe Q8 conductings, switching tube Q5, Q6, Q7 turn-off, application-specific integrated circuit (ASIC) 151 control switch pipe Q1, Q2, Q3, Q4 turn-off, when all-wave voltage drops to the process of 0V from peak value, the whole course of work is the reverse process of said process, is not described in detail in this.
Wherein, in the time of switching tube conducting, application-specific integrated circuit (ASIC) 151,152 controls by corresponding current sense resistor the electric current that flows through corresponding high-voltage LED.
Based on the above, those skilled in the art should know the internal structure of application-specific integrated circuit (ASIC) 151 and 152, therefore be not described in detail in this.
In addition,, in the time that reality is used, preferably need to meet VF1=VF5, VF2=VF6, VF3=VF7, VF4=VF8.
By testing in the test board automatically switching at high-low pressure, high-voltage LED driving circuit shown in above-mentioned Fig. 1, its power factor, efficiency and harmonic wave are basic identical with power factor, the efficiency of high-voltage LED driving circuit that is only operated in high or low voltage respectively, but harmonic component when high pressure decreases a little.
In sum, the high-voltage LED driving circuit that can be operated under full voltage of the present invention passes through string the control of switch control unit to two groups of LED unit connected modes, can make circuit can be operated under high low-voltage; In addition, the control by driver element to each switching tube, can realize the light modulation of circuit.So the present invention has effectively overcome various shortcoming of the prior art and tool high industrial utilization.
Above-described embodiment is illustrative principle of the present invention and effect thereof only, but not for limiting the present invention.Any person skilled in the art scholar all can, under spirit of the present invention and category, modify or change above-described embodiment.Therefore, such as in affiliated technical field, have and conventionally know that the knowledgeable, not departing from all equivalence modifications that complete under disclosed spirit and technological thought or changing, must be contained by claim of the present invention.
Claims (8)
1. can be operated in the high-voltage LED driving circuit under full voltage, it is characterized in that, the described high-voltage LED driving circuit that can be operated under full voltage at least comprises:
At least two group LED unit, each group comprises multiple high-voltage LEDs and multiple switching tube;
Line voltage detection unit, for coming output string control signal based on supply voltage;
String switch control unit, for controlling string the connection of each group of LED unit based on described string control signal;
The rectification output unit that comprises input protection circuit, for being converted to the power supply of access LED unit required voltage;
Driver element, for the output voltage based on rectifying output circuit control each group LED unit the switching of each switching tube and the electric current of each high-voltage LED.
2. the high-voltage LED driving circuit that can be operated under full voltage according to claim 1, is characterized in that: in the time that described power supply is AC power, described rectification output unit comprises current rectifying and wave filtering circuit.
3. the high-voltage LED driving circuit that can be operated under full voltage according to claim 1, is characterized in that: described driver element comprises the application-specific integrated circuit (ASIC) that carrys out output switch pipe control signal for the output voltage based on rectifying output circuit.
4. the high-voltage LED driving circuit that can be operated under full voltage according to claim 3, is characterized in that: described driver element comprises the current sense resistor being connected with described application-specific integrated circuit (ASIC).
5. the high-voltage LED driving circuit that can be operated under full voltage according to claim 1, is characterized in that: described line voltage detection unit builds based on resistance capacitance.
6. the high-voltage LED driving circuit that can be operated under full voltage according to claim 1, is characterized in that: described string switch control unit build based on resistance, triode, voltage-stabiliser tube, diode and switching tube.
7. the high-voltage LED driving circuit that can be operated under full voltage according to claim 1, is characterized in that: described power supply comprises 110V AC power.
8. the high-voltage LED driving circuit that can be operated under full voltage according to claim 1, is characterized in that: described power supply comprises 220V AC power.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104507207A (en) * | 2014-11-21 | 2015-04-08 | 南京大学 | High-performance current-type multi-switching LED controller |
| CN105792474A (en) * | 2015-11-23 | 2016-07-20 | 厦门兴恒隆股份有限公司 | Wide-voltage AC drive circuit for LED power supply |
| WO2017067143A1 (en) * | 2015-10-20 | 2017-04-27 | 晨辉光宝科技有限公司 | Automatic mode-switching full voltage segmented linear constant current led drive circuit |
| TWI584676B (en) * | 2014-12-17 | 2017-05-21 | 隆達電子股份有限公司 | Universal-voltage light emitting diode device and control method for providing universal-voltage input to light emitting diode device |
| US10201048B2 (en) | 2015-08-13 | 2019-02-05 | Silicon Works Co., Ltd. | Lighting apparatus |
| CN109392214A (en) * | 2017-08-09 | 2019-02-26 | 上海酷蓝电子科技有限公司 | A kind of linearity constant current control circuit adapting to full voltage input |
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| EP2288234A1 (en) * | 2009-07-30 | 2011-02-23 | Advanced Connectek Inc. | Light emitting diode (LED) driver and associated LED driving method |
| CN102083248A (en) * | 2009-11-30 | 2011-06-01 | 光明电子有限公司 | Electronic device |
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| EP2288234A1 (en) * | 2009-07-30 | 2011-02-23 | Advanced Connectek Inc. | Light emitting diode (LED) driver and associated LED driving method |
| CN102083248A (en) * | 2009-11-30 | 2011-06-01 | 光明电子有限公司 | Electronic device |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104507207A (en) * | 2014-11-21 | 2015-04-08 | 南京大学 | High-performance current-type multi-switching LED controller |
| CN104507207B (en) * | 2014-11-21 | 2019-03-15 | 南京大学 | High-performance electric streaming cuts LED controller more |
| TWI584676B (en) * | 2014-12-17 | 2017-05-21 | 隆達電子股份有限公司 | Universal-voltage light emitting diode device and control method for providing universal-voltage input to light emitting diode device |
| US10201048B2 (en) | 2015-08-13 | 2019-02-05 | Silicon Works Co., Ltd. | Lighting apparatus |
| WO2017067143A1 (en) * | 2015-10-20 | 2017-04-27 | 晨辉光宝科技有限公司 | Automatic mode-switching full voltage segmented linear constant current led drive circuit |
| US10034338B2 (en) | 2015-10-20 | 2018-07-24 | Ch Lighting Technology Co., Ltd. | Full voltage segmented linear constant-current LED drive circuit in auto switchover mode |
| CN105792474A (en) * | 2015-11-23 | 2016-07-20 | 厦门兴恒隆股份有限公司 | Wide-voltage AC drive circuit for LED power supply |
| CN105792474B (en) * | 2015-11-23 | 2018-06-15 | 厦门兴恒隆股份有限公司 | A kind of Width funtion AC driving circuit for LED power |
| CN109392214A (en) * | 2017-08-09 | 2019-02-26 | 上海酷蓝电子科技有限公司 | A kind of linearity constant current control circuit adapting to full voltage input |
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