CN101883462B - Constant current control method and circuit of multipath paralleled LED power supply - Google Patents
Constant current control method and circuit of multipath paralleled LED power supply Download PDFInfo
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- CN101883462B CN101883462B CN 201010206948 CN201010206948A CN101883462B CN 101883462 B CN101883462 B CN 101883462B CN 201010206948 CN201010206948 CN 201010206948 CN 201010206948 A CN201010206948 A CN 201010206948A CN 101883462 B CN101883462 B CN 101883462B
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Abstract
The invention discloses a constant current control method and a circuit of a multipath paralleled LED power supply. The method comprises the following steps: S100: presetting a current threshold and an MOS (Metal Oxide Semiconductor) voltage drop threshold; S110: opening an MOS tube; S200: detecting the current of each LED lamp bank, judging whether a current value is less than the threshold exists or not, if so, executing S300; and otherwise, executing S400; S300: controlling an AC-DC module to boost the LED lamp banks by using an optical coupling feedback control circuit to ensure that current values of all LED lamp banks are greater than the set current threshold; S400: carrying out current drop processing on the LED lamp banks the current values of which are greater than the set threshold by using a control module to ensure that the current value of each LED lamp bank is equal to the preset current threshold; and S500: carrying out voltage drop detection on the MOS tube of each LED lamp bank by using the control module, controlling the AC-DC module to reduce the direct current output voltage of the MOS tube the voltage drop of which is greater than the threshold and then executing the S200. By adopting the invention, the problems of the light equation and the light decay can be effectively solved and the efficiency of the circuit can be greatly improved.
Description
Technical field
The present invention 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 method in parallel and circuit.
Background technology
Existing LED power supply is when multi-channel parallel, at first be that civil power is converted to direct current output as the power supply of LED lamp by AC/DC power module (AC-DC power supply), at present wherein a kind of 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 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.
Summary of the invention
The object of the present invention 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.
Technical scheme of the present invention is as follows:
A kind of LED power supply duplex constant current control method in parallel comprises:
S100: preestablish a current threshold and a MOS pressure drop threshold value;
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, make the current value of all LED lamp groups 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.
Described LED power supply duplex constant current control method in parallel wherein, also comprises behind the described S100:
S110: open metal-oxide-semiconductor.
Described LED power supply duplex constant current control method in parallel wherein, also comprises:
S500: by control module the metal-oxide-semiconductor on each LED lamp group is carried out voltage drop detection, to the situation of pressure drop greater than setting threshold, by optocoupler feedback control circuit control AC-DC module VD is reduced, carry out S200 then.
Described LED power supply duplex constant current control method in parallel, wherein, described S400 further comprises:
Described control module reduces the electric current of metal-oxide-semiconductor place LED lamp group, the current threshold that makes the electric current on the LED lamp group of place equal to set by improving current value greater than the pressure drop of the metal-oxide-semiconductor on the LED lamp group of setting current threshold.
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.
Beneficial effect of the present invention: the present invention is by setting up a circuit control module at 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 LED power supply duplex provided by the invention constant-current control circuit in parallel;
Fig. 4 is the flow chart of LED power supply duplex provided by the invention constant current control method in parallel.
Embodiment
For making purpose of the present invention, technical scheme and advantage clearer, clear and definite, below develop simultaneously with reference to accompanying drawing that the present invention is described in more detail for embodiment.
Referring to Fig. 3, be the theory diagram of LED power supply duplex of the present invention 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 into direct current as the driving power of LED lamp group.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 for the pressure drop of control 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 as the nucleus module of described constant-current control circuit, is used for by the current acquisition circuit, and smooth line and metal-oxide-semiconductor form a closed 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 corresponding control according to the comparative result of input.If comparative result shows overtension, then described control module can its magnitude of voltage of corresponding reduction.
Be the flow chart of LED power supply duplex provided by the invention constant current control method in parallel referring to Fig. 4, 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, make the current value of all LED lamp groups 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, to the situation of pressure drop greater than setting threshold, by optocoupler feedback control circuit control AC-DC module VD is reduced, carry out S200 then.
Illustrate that below by two specific embodiments described control method is to the specific implementation process of the control of circuit:
LED specification according to LED lamp group determines a current threshold; Be stored in this current threshold in the control module that is constituted 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 lossless (and traditional DC/DC constant current exists than lossy, efficient is lower) almost, 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 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 invention 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 claims of the present invention.
Claims (4)
1. LED power supply duplex constant current control method in parallel comprises:
S100: preestablish a current threshold and a MOS pressure drop threshold value;
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, make the current value of all LED lamp groups 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;
Described S400 further comprises:
Described control module reduces the electric current of metal-oxide-semiconductor place LED lamp group, the current threshold that makes the electric current on the LED lamp group of place equal to set by improving current value greater than the pressure drop of the metal-oxide-semiconductor on the LED lamp group of setting current threshold;
After the electric current on all LED lamp groups all equals setting threshold, described control module is carried out voltage drop detection to the metal-oxide-semiconductor on each LED lamp group, 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, reduces VD by the optocoupler feedback simultaneously.
2. LED power supply duplex according to claim 1 constant current control method in parallel is characterized in that, also comprises behind the described S100:
S110: open metal-oxide-semiconductor.
3. LED power supply duplex according to claim 1 constant current control method in parallel is characterized in that, also comprises:
S500: by control module the metal-oxide-semiconductor on each LED lamp group is carried out voltage drop detection, to the situation of pressure drop greater than setting threshold, by optocoupler feedback control circuit control AC-DC module VD is reduced, carry out S200 then.
4. 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;
Also comprise:
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 control module improves current value greater than the pressure drop of the metal-oxide-semiconductor on the LED lamp group of setting current threshold by smooth line, reduces the electric current of metal-oxide-semiconductor place LED lamp group, the current threshold that makes the electric current on the LED lamp group of place equal to set;
Also comprise:
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 control module, after the electric current on all LED lamp groups all equals setting threshold, by voltage limit circuit the metal-oxide-semiconductor on each LED lamp group is carried out voltage drop detection, 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, reduces VD by the optocoupler feedback control circuit simultaneously.
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| CN103675419B (en) * | 2012-09-19 | 2018-02-06 | 深圳市海洋王照明工程有限公司 | Constant current comparison circuit and LED light group current monitoring device |
| CN105187749B (en) * | 2015-09-25 | 2018-08-31 | 深圳创维－Rgb电子有限公司 | A kind of television backlight Drive And Its Driving Method |
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| CN101226412A (en) * | 2007-01-18 | 2008-07-23 | 株式会社理光 | Constant-current circuit and light-emitting diode drive device therewith |
| CN201197211Y (en) * | 2008-01-28 | 2009-02-18 | 杭州士兰微电子股份有限公司 | Output current compensation circuit of LED driving circuit |
| CN101489342A (en) * | 2009-02-27 | 2009-07-22 | 杭州士兰微电子股份有限公司 | LED driver circuit and driving method thereof |
| CN101500358A (en) * | 2008-01-28 | 2009-08-05 | 杭州士兰微电子股份有限公司 | Output current compensation circuit of LED driving circuit |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101226412A (en) * | 2007-01-18 | 2008-07-23 | 株式会社理光 | Constant-current circuit and light-emitting diode drive device therewith |
| CN201197211Y (en) * | 2008-01-28 | 2009-02-18 | 杭州士兰微电子股份有限公司 | Output current compensation circuit of LED driving circuit |
| CN101500358A (en) * | 2008-01-28 | 2009-08-05 | 杭州士兰微电子股份有限公司 | Output current compensation circuit of LED driving circuit |
| CN101489342A (en) * | 2009-02-27 | 2009-07-22 | 杭州士兰微电子股份有限公司 | LED driver circuit and driving method thereof |
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Address after: 518000 Guangdong province Shenzhen City Guanlan town library pit Jingquan Industrial Park Applicant after: Shenzhen JingQuanHua Electronics Co., Ltd. Address before: 518000 Guangdong province Shenzhen City Guanlan town library pit Jingquan Industrial Park Applicant before: Shenzhen Jingquanhua Electronics Co., Ltd. |
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