CN201830498U - Multi-path parallel constant-current control circuit of light emitting diode (LED) power supply - Google Patents
Multi-path parallel constant-current control circuit of light emitting diode (LED) power supply Download PDFInfo
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- CN201830498U CN201830498U CN2010202333571U CN201020233357U CN201830498U CN 201830498 U CN201830498 U CN 201830498U CN 2010202333571 U CN2010202333571 U CN 2010202333571U CN 201020233357 U CN201020233357 U CN 201020233357U CN 201830498 U CN201830498 U CN 201830498U
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- 239000004065 semiconductor Substances 0.000 claims abstract description 29
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- 230000003287 optical effect Effects 0.000 abstract 2
- 229910044991 metal oxide Inorganic materials 0.000 abstract 1
- 150000004706 metal oxides Chemical class 0.000 abstract 1
- 238000000034 method Methods 0.000 description 10
- 238000010586 diagram Methods 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
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- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
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- 230000001351 cycling effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000005669 field effect Effects 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
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Abstract
The utility model discloses a multi-path parallel constant-current control circuit of a light emitting diode (LED) power supply, which comprises an alternating-current-direct-current (AC-DC) module and LED lamp banks. The multi-path parallel constant-current control circuit of the LED power supply also comprises metal oxide semiconductor (MOS) tubes connected with each LED lamp bank in a one-to-one correspondence way, a current collection module carrying out collection and digitized processing on the current of each LED lamp bank, a control module carrying out constant-current control on the entire LED lamp bank and an optical coupling feedback control circuit enabling the AC-DC module to regulate output voltage by receiving a signal of the control module, wherein one ends of the MOS tubes are connected with the LED lamp banks, the other ends of the MOS tubes are connected with the current collection module, the other end of the current collection module is connected to the control module, and the optical coupling feedback control circuit is connected between the control module and the AC-DC module. By adopting the utility model, the problems of light equation and light attenuation can be effectively solved, and the efficiency of the circuit is greatly enhanced.
Description
Technical field
The utility model relates to the constant current control technology of a kind of LED power supply duplex parallel connection, in particular a kind of LED power supply duplex constant-current control circuit in parallel.
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; The light decay problem of LED lamp is very serious in addition, directly influences the useful life of LED lamp.
Existing another kind of circuit design scheme as shown in Figure 2, this programme is to set up a BUCK control circuit (being DC-DC) 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.
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 constant current control method in parallel and circuit, be intended to solve the equation of light and the light decay problem that produce because of the current unevenness weighing apparatus between the LED lamp group of existing LED power supply duplex parallel connection, and the efficiency of raising circuit.
The technical solution of the utility model is as follows:
A kind of LED power supply duplex constant-current control circuit in parallel comprises AC-DC module and LED lamp group, wherein, also comprises:
The metal-oxide-semiconductor that connects one to one with each LED lamp group;
The electric current of each LED lamp group is gathered current acquisition module with digitized processing;
Whole LED lamp group is carried out the control module of constant current control;
Make the AC-DC module adjust the optocoupler feedback control circuit of output voltage by the signal that receives control module,
Wherein, described metal-oxide-semiconductor one end connects LED lamp group, and the other end connects described current acquisition module, and the described current acquisition module other end is connected to described control module, and described optocoupler feedback control circuit is connected between control module and the AC-DC module.
Described LED power supply duplex constant-current control circuit in parallel wherein, also comprises:
The voltage limit circuit of the pressure drop of control metal-oxide-semiconductor, wherein, described voltage limit circuit one end connects LED lamp group, and the other end is connected to control module.
Described LED power supply duplex constant-current control circuit in parallel 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.
The beneficial effects of the utility model: the utility model is by setting up a circuit control module on existing LED lighting apparatus, be used for effectively controlling electric current and pressure drop on each LED lamp group, thereby effectively control difference between current between each LED lamp group in a very little scope, can effectively solve the existing equation of light and light decay phenomenon, and by the voltage drop value in the control circuit in a small range, thereby improve the efficient of circuit greatly.
Description of drawings
Fig. 1 is the circuit theory schematic diagram of existing a kind of LED power supply duplex parallel connection;
Fig. 2 is the circuit theory schematic diagram of existing another kind of LED power supply duplex parallel connection;
Fig. 3 is the principle schematic of the LED power supply duplex that provides of the utility model constant-current control circuit in parallel;
Fig. 4 is the flow chart of the LED power supply duplex that provides of the utility model constant current control method in parallel.
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.
Referring to Fig. 3, be the theory diagram of LED power supply duplex of the present utility model constant-current control circuit in parallel, it comprises AC-DC module 10, control module 30, is connected optocoupler feedback control circuit 20 and LED lamp group between AC-DC module 10 and the control module 30.Described LED lamp group is provided with at least one group, is respectively from LED lamp group 1 to LED lamp group n.All dispose a metal-oxide-semiconductor, a current acquisition module, a smooth line and a voltage limit circuit at each LED lamp group, for example: LED lamp group 1 one ends connect AC-DC module 10, and the other end connects metal-oxide-semiconductor 1; Described current acquisition module 1 one ends connect metal-oxide-semiconductor 1, and the other end is connected to control module 30; Described smooth line 1 one ends connect metal-oxide-semiconductor 1, and the other end is connected to control module 30; Described voltage limit circuit 1 one ends are connected on the common port of LED lamp group 1 and metal-oxide-semiconductor 1, and the other end is connected to control module 30.Circuit connecting mode for metal-oxide-semiconductor n, current acquisition module n, smooth line n and the voltage limit circuit n of LED lamp group n correspondence is consistent with LED lamp group 1.(n is the natural number more than or equal to 1)
Wherein, described AC-DC module 10 is used for changing alternating current the driving power of direct current as LED lamp group into.Smooth line is used for the control signal of control module 30 being carried out smoothly shaping.The current acquisition module is used for the electric current of LED lamp group is gathered, and carries out digitized processing, and input control module 30 then.Optocoupler feedback control circuit 20 is used for described control module 30 and directly feeds back to the AC end 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.The effect of described metal-oxide-semiconductor is switch and electric current corrective action.Described control module 30 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 30 the most at last, and control module 30 is sent control corresponding according to the comparative result of input.If the comparative result display voltage is too high, then described control module can its magnitude of voltage of corresponding reduction.
The flow chart of the LED power supply duplex constant current control method in parallel that provides for the utility model referring to Fig. 4, described LED power supply duplex constant current control method in parallel may further comprise the steps:
Referring to Fig. 4 is the flow chart of LED power supply duplex provided by the invention constant current control method in parallel, and described LED power supply duplex constant current control method in parallel 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 (3)
1. a LED power supply duplex constant-current control circuit in parallel comprises AC-DC module and LED lamp group, it is characterized in that, also comprises:
The metal-oxide-semiconductor that connects one to one with each LED lamp group;
The electric current of each LED lamp group is gathered current acquisition module with digitized processing;
Whole LED lamp group is carried out the control module of constant current control;
Make the AC-DC module adjust the optocoupler feedback control circuit of output voltage by the signal that receives control module,
Wherein, described metal-oxide-semiconductor one end connects LED lamp group, and the other end connects described current acquisition module, and the described current acquisition module other end is connected to described control module, and described optocoupler feedback control circuit is connected between control module and the AC-DC module.
2. LED power supply duplex according to claim 1 constant-current control circuit in parallel 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 LED lamp group, and the other end is connected to control module.
3. LED power supply duplex according to claim 1 constant-current control circuit in parallel 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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202333571U CN201830498U (en) | 2010-06-14 | 2010-06-14 | Multi-path parallel constant-current control circuit of light emitting diode (LED) power supply |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202333571U CN201830498U (en) | 2010-06-14 | 2010-06-14 | Multi-path parallel constant-current control circuit of light emitting diode (LED) power supply |
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| CN201830498U true CN201830498U (en) | 2011-05-11 |
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| CN2010202333571U Expired - Fee Related CN201830498U (en) | 2010-06-14 | 2010-06-14 | Multi-path parallel constant-current control circuit of light emitting diode (LED) power supply |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103915882A (en) * | 2014-04-01 | 2014-07-09 | 深圳市理邦精密仪器股份有限公司 | Input circuit with multiple power sources connected in parallel |
-
2010
- 2010-06-14 CN CN2010202333571U patent/CN201830498U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103915882A (en) * | 2014-04-01 | 2014-07-09 | 深圳市理邦精密仪器股份有限公司 | Input circuit with multiple power sources connected in parallel |
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| C14 | Grant of patent or utility model | ||
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| 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 |
Granted publication date: 20110511 Termination date: 20180614 |
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| CF01 | Termination of patent right due to non-payment of annual fee |