CN201830497U - Multi-path current-distribution control circuit of light emitting diode (LED) power supply - Google Patents
Multi-path current-distribution control circuit of light emitting diode (LED) power supply Download PDFInfo
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- CN201830497U CN201830497U CN2010202333374U CN201020233337U CN201830497U CN 201830497 U CN201830497 U CN 201830497U CN 2010202333374 U CN2010202333374 U CN 2010202333374U CN 201020233337 U CN201020233337 U CN 201020233337U CN 201830497 U CN201830497 U CN 201830497U
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Abstract
The utility model discloses a multi-path current-distribution control circuit of a light emitting diode (LED) power supply, which comprises an alternating-current-direct-current (AC-DC) module, an LED lamp circuit, a control module and an optical coupling feedback control circuit, wherein the AC-DC module is used for converting alternating current into direct current as a driving power supply of LED lamp banks. The optical coupling feedback control circuit is used for directly feeding back the control module to the AC-DC module by the circuit, thereby regulating output voltage. The control module is used as a core module of the constant-current control circuit and is used for controlling the current of each string of LEDs. By adopting the utility model, the stability of the circuit can be enhanced. Moreover, the problems of light equation and light attenuation are effectively solved, and the efficiency of the circuit is greatly enhanced.
Description
Technical field
The utility model relates to a kind of LED power supply duplex electric current and distributes accurate control technique, and in particular a kind of LED power supply duplex electric current distributes control circuit.
Background technology
Existing LED power supply is when multi-channel parallel, at first be that civil power is converted to the power supply of direct current output as the LED lamp by AC/DC power module (AC-DC power supply), wherein a kind of at present circuit design scheme as shown in Figure 1, this programme is the output terminal direct paralleled many group LED lamp groups at the AC/DC power module.This method can will cause the equation of light phenomenon between the LED lamp group because the difference between the LED individuality cause the electric current respectively organized on the LED lamp group inconsistent, directly influences the effect of LED lamp; Very serious useful life that directly influences the LED lamp of light decay problem that also can the LED lamp in addition.
Existing another kind of circuit design scheme as shown in Figure 2, this programme is to set up a BUCK control circuit (being the DC-DC circuit) at the power input of each group LED lamp group, the electric current that is used for controlling every group of LED lamp group is consistent as far as possible, can solve the problem of the equation of light relatively.But the sort circuit design does not effectively solve the efficiency (because of there is bigger loss in the DC/DC circuit) of circuit, and cost is also higher simultaneously.
Prior art exists following definite:
1, when LED lamp group quantity in parallel is many,, causes having the equation of light between the LED lamp group because line impedance causes between each LED lamp group electric current inconsistent;
2, the inconsistency between each LED lamp group causes the efficient of circuit lower;
3, each LED lamp group is connected on the same DC power supply, particularly under the high-pressure work situation, if DC power supply all LED lamp groups of fault occur with regard to cisco unity malfunction, even damages circuit, and the stability of circuit is reduced;
4, the dissipation power of existing scheme causes the internal temperature of LED lamp group higher more greatly, thereby directly causes the light decay phenomenon serious, influences the life-span of LED lamp group.
Therefore, prior art has yet to be improved and developed.
The utility model content
The purpose of this utility model is to provide a kind of LED power supply duplex electric current to divide distribution controlling method and circuit, is intended to solve the circuit stability problem that existing LED power supply duplex electric current divides the timing inconsistency to cause problem at the bottom of the equation of light, light decay, circuit efficiency between LED lamp group and existing connected mode to cause.
The technical solution of the utility model is as follows:
A kind of LED power supply duplex electric current distributes control circuit, wherein, comprise AC-DC module, LED circuit for lamp, control module and optocoupler feedback control circuit, described LED circuit for lamp also comprises: transformer, first rectification module, second rectification module, a LED lamp group, the 2nd LED lamp group, metal-oxide-semiconductor, current acquisition module
Wherein, the positive pole of described transformer connects metal-oxide-semiconductor; Described metal-oxide-semiconductor one end connects first rectification module and second rectification module, and described second rectification module connects the positive pole of a LED lamp group, and described first rectification module connects the positive pole of the 2nd LED lamp group; The negative pole of a described LED lamp group links to each other with the negative pole of the 2nd LED lamp group, and the negative pole of a described LED lamp group (negative pole of the 2nd LED lamp group) connects electric current and adopts module and control module, and the other end of described current sample module is connected the negative pole of transformer; Described optocoupler feedback control circuit is connected between control module and the AC-DC module.
Described LED power supply duplex electric current distributes control circuit, wherein, also comprises:
The voltage limit circuit of the pressure drop of control metal-oxide-semiconductor, wherein, described voltage limit circuit one end connects the positive pole of transformer, and the other end is connected control module.
Described LED power supply duplex electric current distributes control method circuit, wherein, also comprises:
To the control signal of control module carry out smoothly, the smooth line of shaping, described smooth line one end connects metal-oxide-semiconductor, other end link control module.
Described LED power supply duplex electric current distributes control method circuit, and wherein, described LED circuit for lamp is at least one.
The beneficial effects of the utility model: the utility model is provided with a plurality of transformers by the input at circuit, and each transformer is linked with two groups of LED lamp groups, thereby effectively solves the unsteadiness of available circuit; In circuit, set up a circuit control module and supporting control circuit in addition, come the pressure drop of control circuit and the voltage of DC power supply to realize the precision control that the multichannel electric current distributes.The brightness that makes LED lamp group evenly, the consume of circuit reduces, efficient improves.
Description of drawings
Fig. 1 is that existing a kind of LED power supply duplex electric current distributes the control circuit principle schematic;
Fig. 2 is that existing another kind of LED power supply duplex electric current distributes the control circuit principle schematic;
Fig. 3 is the principle schematic that the LED power supply duplex electric current that provides of the utility model embodiment one distributes control circuit
Fig. 4 is the principle schematic that the LED power supply duplex electric current that provides of the utility model embodiment two distributes control circuit;
Fig. 5 is the flow chart that LED power supply duplex electric current that the utility model provides divides distribution controlling method.
Embodiment
For making the purpose of this utility model, technical scheme and advantage clearer, clear and definite, below the utility model is further described with reference to the accompanying drawing embodiment that develops simultaneously.
The principle schematic that the LED power supply duplex electric current that provides for the embodiment of the invention one referring to Fig. 3 distributes control circuit, described LED power supply duplex electric current distributes control circuit, comprise AC-DC module 10, LED circuit for lamp 40, control module 20 and optocoupler feedback control circuit 30, described LED circuit for lamp 40 also comprises: transformer, first rectification module, second rectification module, a LED lamp group, the 2nd LED lamp group, metal-oxide-semiconductor, current acquisition module, wherein, the positive pole of described transformer connects metal-oxide-semiconductor; Described metal-oxide-semiconductor one end connects first rectification module and second rectification module, and described second rectification module connects the positive pole of a LED lamp group, and described first rectification module connects the positive pole of the 2nd LED lamp group; The negative pole of a described LED lamp group links to each other with the negative pole of the 2nd LED lamp group, and the negative pole of a described LED lamp group (negative pole of the 2nd LED lamp group) connects current acquisition module and control module 20, and the other end of described current acquisition module is connected the negative pole of transformer; Described smooth line one end connects metal-oxide-semiconductor, and the other end is connected control module 20; Described voltage limit circuit one end connects the positive pole of transformer, and the other end is connected control module 20; Described optocoupler feedback control circuit 30 is connected between control module 20 and the AC-DC module 10.The LED circuit for lamp only is one in the present embodiment, and the present invention also provides embodiment two, and the number of LED circuit for lamp is n (vide infra) in the circuit of embodiment two.(wherein, n is the natural number greater than 1)
The LED power supply duplex electric current that provides for the embodiment of the invention two referring to Fig. 4 distributes the theory diagram of control circuit, comprise a plurality of LED circuit for lamp in the present embodiment, described circuit comprises AC-DC module 10, transformer 1, transformer n, metal-oxide-semiconductor 1, metal-oxide-semiconductor n, LED lamp group 1, LED lamp group 2, LED lamp group 2n-1, LED lamp group 2n, smooth line 1, smooth line n, rectification module 1, rectification module 2, rectification module 2n-1, LED lamp group 2n, voltage limit circuit 1, voltage limit circuit n, current acquisition circuit 1, current acquisition circuit n, control module 20, optocoupler feedback circuit 30.(wherein, n is the natural number greater than 1)
Wherein, a plurality of transformers that are connected in parallel after the AC-DC module 10, each transformer drive two groups of LED lamp groups, for example transformer 1 and transformer n, transformer 1 driving LED lamp group 1 and LED lamp group 2, transformer n driving LED lamp group 2n-1 and LED lamp group 2n.The follow-up circuit connecting mode of each transformer is consistent.
With transformer n is example, and the positive pole of described transformer n connects metal-oxide-semiconductor n; Described metal-oxide-semiconductor n one end connects rectification module 2n-1 and rectification module 2n, and described rectification module 2n connects the positive pole of LED lamp group 2n-1, and described rectification module 2n-1 connects the positive pole of LED lamp group 2n; The negative pole of described LED lamp group 2n-1 links to each other with the negative pole of LED lamp group 2n, and the negative pole of described LED lamp group 2n-1 (negative pole of LED lamp group 2n) connects electric current and adopts module n and control module 20, and the other end of described current sample module n is connected the negative pole of transformer n; Described smooth line n one end connects metal-oxide-semiconductor n, and the other end is connected control module 20; Described voltage limit circuit n one end connects the positive pole of transformer n, and the other end is connected to control module 20; Described optocoupler feedback control circuit 30 is connected between control module 20 and the AC-DC module 10.Described smooth line n one end connects metal-oxide-semiconductor n, and the other end is connected to control module 20; Described voltage limit circuit n one end is connected metal-oxide-semiconductor n (or transformer n), and the other end is connected to control module 20; One optocoupler feedback control circuit 30 is set between described AC-DC module 10 and control module 20.
Described AC-DC module 10 is used for changing alternating current the driving power of direct current as LED lamp group into.Described transformer is used for LED lamp group is isolated between any two, guarantees the stability of integrated circuit.The effect of described metal-oxide-semiconductor is switch and electric current corrective action.Being used for of rectification module carried out rectifying and wave-filtering to the electric current of input LED lamp group.Smooth line is used for the control signal of control module 20 being carried out smoothly shaping.The current acquisition circuit is used for the electric current of LED lamp group is gathered, and carries out digitized processing, and input control module 20 then.Optocoupler feedback control circuit 30 is used for described control module 20 and directly feeds back to AC-DC module 10 by this circuit, thereby adjusts output voltage.Voltage limit circuit is used to control the pressure drop of metal-oxide-semiconductor, to guarantee the efficient of entire circuit.Described control module 20 is used for by the current acquisition circuit as the nucleus module of described constant-current control circuit, and smooth line and metal-oxide-semiconductor form a close-loop feedback control, and the electric current of LED is respectively gone here and there in control.
Described voltage limit circuit also comprises a voltage collection circuit and voltage comparator circuit, and voltage ratio result is input to control module 20 the most at last, and control module 20 is sent control corresponding according to the comparative result of input.If the too high described control module of comparative result display voltage then can its magnitude of voltage of corresponding reduction.
Referring to Fig. 4 is the flow chart that LED power supply duplex electric current provided by the invention divides distribution controlling method, and described LED power supply duplex electric current divides distribution controlling method, may further comprise the steps:
S100: preestablish a current threshold and a MOS pressure drop threshold value;
S110: open metal-oxide-semiconductor;
S200: detecting the electric current on each LED lamp group, judge whether the current value less than threshold value, is then to carry out S300, otherwise carries out S400;
S300: by optocoupler feedback control circuit control AC-DC module LED lamp group is boosted, the current value that makes all LED lamp groups is all more than or equal to the current threshold that sets;
S400: by control module current value is fallen current processing greater than the LED lamp group of setting threshold, make the current value on each LED lamp group be equal to predefined current threshold.
S500: by control module the metal-oxide-semiconductor on each LED lamp group is carried out voltage drop detection,, VD is reduced, carry out S200 then by optocoupler feedback control circuit control AC-DC module to the situation of pressure drop greater than setting threshold.
Below by two specific embodiments the specific implementation process of described control method to the control of circuit is described:
LED specification according to LED lamp group determines a current threshold; Be stored in this current threshold in the control module that constitutes by single-chip microcomputer (process chip is not limited to single-chip microcomputer) by software program; Circuit design is finished, and after powering on, is connected the electric current that the current acquisition module on the metal-oxide-semiconductor obtains on the LED lamp group of place and passes to control module then, and control module compares current value and the predefined current threshold that receives.Described control module can be handled a plurality of LED lamp groups simultaneously, if the current value of any one is less than setting threshold in a plurality of LED lamp groups, described control module raises the input voltage of LED lamp group by the optocoupler feedback control circuit, and the electric current on all LED lamp groups is all more than or equal to the current threshold of setting.
For example predefined current threshold is 350mA, the current value of the LED lamp group 1 that obtains be the current value of 330mA, LED lamp group 2 be the current value of 360mA, LED lamp group 3 be 350mA ..., control module will raise the VD of AC-DC module by the optocoupler feedback control circuit, and the voltage rising after-current on the LED lamp group also can raise together.After reaching 350mA, current value in being checked through LED lamp group 1 then stops to boost.The current value of the LED lamp group that this moment is all is all more than 350mA.
Also have a kind of situation be exactly the electric current of circuit all LED lamp groups after powering on all more than setting threshold, this moment, control module then need not to control optocoupler feedback control circuit go the to raise DC input voitage of LED lamp group.
Next step operation that single-chip microcomputer will be carried out is:
Control module at current value greater than the LED lamp group of setting current threshold, the pressure drop that improves metal-oxide-semiconductor by smooth line, thus reduce electric current on the LED lamp group of metal-oxide-semiconductor place, till the electric current on this LED lamp group equals setting threshold.
In Single Chip Microcomputer (SCM) program, also be provided with a metal-oxide-semiconductor pressure drop threshold value in advance, after the electric current on all LED lamp groups all equals setting threshold, control module is by the pressure drop on the voltage limit circuit inspection metal-oxide-semiconductor, after the pressure drop on the metal-oxide-semiconductor is greater than the metal-oxide-semiconductor pressure drop threshold value of setting, control module is reduced to below the setting threshold voltage drop value of metal-oxide-semiconductor by smooth line, reduce VD by optocoupler feedback simultaneously, thereby not only reduced the temperature of circuit but also guaranteed the efficient of LED lamp group circuit.Continue to carry out the galvanoscopy on the LED lamp group then, the repetitive cycling operation.
Present embodiment adopts unique hardware circuit and software algorithm, and each LED lamp group is accurately controlled, and accurately controls to the electric current of each LED lamp group, and superior performance has been taken into account efficient and performance.At the electric current of accurately controlling each LED lamp group simultaneously, guaranteed the efficient of LED driving power, described control module is almost lossless (and traditional DC/DC constant current exists than lossy, efficient is lower), the system effectiveness of present embodiment can reach 92% through experiment, and dissipation power is little.Light fixture internal heat generation amount is few, has reduced the temperature and the light decay of light fixture, thereby has effectively prolonged the life-span of LED lamp group.
Should be understood that application of the present utility model is not limited to above-mentioned for those of ordinary skills, can be improved according to the above description or conversion for example, for example, metal-oxide-semiconductor can be with other field effect transistor replacements etc.All these improvement and conversion all should belong to the protection range of the utility model claims.
Claims (4)
1. a LED power supply duplex electric current distributes control circuit, it is characterized in that, comprise AC-DC module, LED circuit for lamp, control module and optocoupler feedback control circuit, described LED circuit for lamp also comprises: transformer, first rectification module, second rectification module, a LED lamp group, the 2nd LED lamp group, metal-oxide-semiconductor, current acquisition module
Wherein, the positive pole of described transformer connects metal-oxide-semiconductor; Described metal-oxide-semiconductor one end connects first rectification module and second rectification module, and described second rectification module connects the positive pole of a LED lamp group, and described first rectification module connects the positive pole of the 2nd LED lamp group; The negative pole of a described LED lamp group links to each other with the negative pole of the 2nd LED lamp group, and the negative pole of a described LED lamp group connects current acquisition module and control module, and the other end of described current acquisition module is connected the negative pole of transformer; Described optocoupler feedback control circuit is connected between control module and the AC-DC module.
2. LED power supply duplex electric current according to claim 1 distributes control circuit, it is characterized in that, also comprises:
The voltage limit circuit of the pressure drop of control metal-oxide-semiconductor, wherein, described voltage limit circuit one end connects the positive pole of transformer, and the other end is connected control module.
3. LED power supply duplex electric current according to claim 1 distributes control method circuit, it is characterized in that, also comprises:
To the control signal of control module carry out smoothly, the smooth line of shaping, described smooth line one end connects metal-oxide-semiconductor, other end link control module.
4. LED power supply duplex electric current according to claim 1 distributes control method circuit, it is characterized in that described LED circuit for lamp is at least one.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202333374U CN201830497U (en) | 2010-06-14 | 2010-06-14 | Multi-path current-distribution control circuit of light emitting diode (LED) power supply |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202333374U CN201830497U (en) | 2010-06-14 | 2010-06-14 | Multi-path current-distribution control circuit of light emitting diode (LED) power supply |
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| CN201830497U true CN201830497U (en) | 2011-05-11 |
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| CN2010202333374U Expired - Fee Related CN201830497U (en) | 2010-06-14 | 2010-06-14 | Multi-path current-distribution control circuit of light emitting diode (LED) power supply |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110831287A (en) * | 2019-12-13 | 2020-02-21 | 上海顿格电子贸易有限公司 | Driving circuit for LED lamp current distribution |
| CN113556848A (en) * | 2020-04-24 | 2021-10-26 | 中强光电股份有限公司 | Light emitting device and light generating method |
-
2010
- 2010-06-14 CN CN2010202333374U patent/CN201830497U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110831287A (en) * | 2019-12-13 | 2020-02-21 | 上海顿格电子贸易有限公司 | Driving circuit for LED lamp current distribution |
| CN113556848A (en) * | 2020-04-24 | 2021-10-26 | 中强光电股份有限公司 | Light emitting device and light generating method |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: SHENZHEN JINGQUANHUA TECHNOLOGY CO., LTD. Free format text: FORMER NAME: SHENZHEN JINGQUANHUA ELECTRONICS CO., LTD. |
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| CP01 | Change in the name or title of a patent holder |
Address after: 518000 Guangdong province Shenzhen City Guanlan town library pit Jingquan Industrial Park Patentee after: Shenzhen JingQuanHua Electronics Co., Ltd. Address before: 518000 Guangdong province Shenzhen City Guanlan town library pit Jingquan Industrial Park Patentee before: Shenzhen Jingquanhua Electronics Co., Ltd. |
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110511 Termination date: 20180614 |