CN102014561A - Current sharing control method, chip and circuit of LED lighting circuit - Google Patents
Current sharing control method, chip and circuit of LED lighting circuit Download PDFInfo
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- CN102014561A CN102014561A CN2010105661407A CN201010566140A CN102014561A CN 102014561 A CN102014561 A CN 102014561A CN 2010105661407 A CN2010105661407 A CN 2010105661407A CN 201010566140 A CN201010566140 A CN 201010566140A CN 102014561 A CN102014561 A CN 102014561A
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- lamp group
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
Abstract
The invention discloses a current sharing control method, chip and circuit of an LED lighting circuit. The circuit comprises an AC/DC module, a current sharing control chip, LED lamp banks, switching modules, sampling modules and smoothing modules, wherein the input end of the AC/DC module is connected with alternating current and the output end of the AC/DC module thereof is connected with the LED lamp banks; each LED lamp bank corresponds to a switching module, a sampling module and a smoothing module and is connected with the switching module and the sampling module in series in sequence; the control ends of the switching modules are connected to the current sharing control chip; the sampling ends of the sampling modules are connected to the smoothing modules; the output ends of the smoothing modules are connected to the current sharing control chip; and the current sharing control chip is connected with the AC/DC module. The invention can effectively lower the cost of the product and improve the efficiency of the product.
Description
Technical field
The present invention relates to a kind of LED lighting field, in particular a kind of LED lighting circuit current-sharing control method and use the chip of this method and utilize the LED lighting circuit of this chip.
Background technology
Referring to Fig. 1 is the circuit theory diagrams of existing LED lighting circuit, and described circuit comprises that the ac-dc conversion module is the AC/DC module, is used for that alternating current is converted to galvanic current and presses; Being parallel with a plurality of direct current buck modules after the described ac-dc conversion module is the DC/DC module, is connected with a string LED lamp on each DC/DC module.Described each DC/DC module is carried out buck operation according to the requirement of the LED lamp group of its drive, with the requirement of the input current that satisfies each LED lamp group.
There are two point defects in above-mentioned prior art: 1, the price of the DC/DC module on the existing market general more expensive for the circuit that a plurality of LED lamp groups are arranged production cost must be enhanced; 2, the AC voltage of input has been carried out Two Stages is the conversion of first order AC/DC and the conversion of second level DC/DC to prior art, and the efficient of general first order conversion is 90%, and the efficient of second level conversion is 94%, and the efficient that causes entire circuit like this is less than 85%.Big with regard to the produce power loss like this, efficient is low, the problem that complete machine temperature raises.
Therefore, at the problems referred to above, 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 lighting circuit current-sharing control method, chip and circuit, be intended to solve the high problem of cost that existing LED lamp adopts the DC/DC module to cause, and the energy consumption that adopts the Two Stages circuit to cause is big, the problem at the bottom of the efficient.
Technical scheme of the present invention is as follows:
A kind of LED lighting circuit current-sharing control method wherein, may further comprise the steps:
S100: gather the current value on each LED lamp group;
S200: judging whether to exist the LED lamp group of current value less than predetermined current value, is execution in step S300 then, otherwise execution in step S400;
S300: then output promotes the control signal of the input voltage of LED lamp group, makes current value on each LED lamp group all greater than predetermined current value;
S400:, make that the average current on the LED lamp group equals predetermined current value in the total time that turn-on and turn-off form by giving each control signal that the output of LED lamp group can independently be turn-offed its circuit.
Described LED lighting circuit current-sharing control method, wherein, described method is by gathering the electric current on the LED lamp group continuously, adjusting the time of turn-offing dynamically.
A kind of LED lighting circuit sharing control chip, wherein, described sharing control chip is realized the function of sharing control by adopting above-mentioned method.
A kind of LED lighting circuit equalizing control circuit wherein, comprises AC/DC module, sharing control chip, LED lamp group, switch module, sampling module peace sliding formwork piece, and the input of described AC/DC module connects alternating current, and output connects LED lamp group; The corresponding switch module of each LED lamp group, a sampling module and a level and smooth module, described switch module and described sampling module successively are connected in series on each LED lamp group; The control end of described switch module is connected to the sharing control chip, and the sampling end of described sampling module is connected to described level and smooth module, and the output of described level and smooth module is connected to the sharing control chip; Described sharing control chip also connects described AC/DC module.
Described LED lighting circuit equalizing control circuit, wherein, described LED lamp group is a plurality of, a plurality of LED lamp groups are connected in parallel on the output of described AC/DC module.
Described LED lighting circuit equalizing control circuit, wherein, described switch module is a field effect transistor.
Described LED lighting circuit equalizing control circuit, wherein, described sampling module is a resistance.
Described LED lighting circuit equalizing control circuit, wherein, described level and smooth module is a resistance-capacitance circuit.
Described LED lighting circuit equalizing control circuit, wherein, described sharing control chip is a MCU chip.
Beneficial effect of the present invention: the present invention controls separately each LED lamp group by adopting a kind of special current-sharing control method.By gathering the current value on the LED lamp group, adjust average electric current on each lamp group by the shutoff phase of controlling each LED lamp group then, thereby make each LED lamp group brightness even.
Description of drawings
Fig. 1 is the circuit theory diagrams of existing LED lighting circuit.
Fig. 2 is the circuit theory diagrams of the LED lighting circuit that provides of the embodiment of the invention.
Fig. 3 is the flow chart of the current-sharing control method that provides of the embodiment of the invention.
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.
As shown in Figure 2, the circuit of the LED lighting circuit that provides of the embodiment of the invention comprises AC/DC module, sharing control chip, LED lamp group, switch module, sampling module peace sliding formwork piece.Described AC/DC module is used for that alternating current is converted to galvanic current presses, and described AC/DC module can be adjusted output voltage according to the control of sharing control chip.Described sharing control chip is for the function of MCU chip by implantation control corresponding method (seeing current-sharing control method hereinafter described for details) realization sharing control, because the cost of MCU is very low, so help reducing the cost of this product.Described LED lamp group has on a plurality of output ports that all are connected in the AC/DC module in parallel, is connected with a plurality of LED lamp pearls on each LED lamp group.But described switch module is a controlled device, and its break-make is the control that is subjected to the sharing control chip, and the switch module that the embodiment of the invention provides is field effect transistor MOSFET, does not get rid of as those of ordinary skills certainly and uses other similar switch elements to replace.Described sampling module is used for the sharing control chip and gathers magnitude of voltage on the LED lamp group, and sampling module described in the present embodiment is a resistance, for the resistance of the described resistance that cuts down the consumption of energy can be as far as possible little, for example is 0.01 ohm.Certainly not getting rid of as those of ordinary skills uses other similar sampling elements to replace.Described level and smooth module is used for the level and smooth signal of gathering, and imports current sharing control module then.Described level and smooth module is a resistance-capacitance circuit.
Described AC/DC module input connects alternating current, and output connects LED lamp group.The number of described LED lamp group is one or more, and a plurality of LED lamp groups are connected in parallel on the output of described AC/DC module.The corresponding switch module of each LED lamp group, a sampling module and a level and smooth module, described switch module and described sampling module successively are connected in series on each LED lamp group.The control end of described switch module is connected to the sharing control chip, and the sampling end of described sampling module is connected to described level and smooth module, and the output of described level and smooth module is connected to the sharing control chip.Described sharing control chip also connects described AC/DC module.
As shown in Figure 3, the flow process of the current-sharing control method that provides of the embodiment of the invention may further comprise the steps:
Step S100: gather the current value on each LED lamp group.
Step S200: judging whether to exist the LED lamp group of current value less than predetermined current value, is execution in step S300 then, otherwise execution in step S400.
Step S300: then output promotes the control signal of the input voltage of LED lamp group, makes current value on each LED lamp group all greater than predetermined current value.
Step S400:, make that the average current on the LED lamp group equals predetermined current value in the total time that turn-on and turn-off form by giving each control signal that the output of LED lamp group can independently be turn-offed its circuit.
Now for example this method is specifically described, 6 the LED lamp groups that for example are connected in parallel on the output of AC/DC module in the present embodiment, the predetermined current value of establishing on each LED lamp group is 350mA.Just begun switch module and be in conducting state, after LED lamp group powered on, described current sharing control module began to gather 6 virtual voltages on the LED lamp group, and was undertaken smoothly by the voltage waveform of the level and smooth module on each LED lamp group to sampling.Described current sharing control module can get current value on the LED lamp group according to the magnitude of voltage analysis of sampling, if in the current value of 6 LED lamp groups again less than predetermined current value, for example 6 current values are respectively 360mA, 370mA, 340mA, 330mA, 370mA, 380mA, then the sharing control chip can send control signal and give described AC/DC module, making it promote output voltage makes current value have only the current value of the LED lamp group of 330mA to promote 350mA at least, the step S400 that adopts this method to provide then.If the current value of 6 LED lamp groups is all greater than predetermined current value, the step S400 that then adopts this method to provide.For the efficient that makes complete machine further improves, earlier control AC/DC module reduces output voltage before execution in step S400, makes the current value of one of them LED lamp group reach after the predetermined current value execution in step S400 again.
The concrete operations of method step S400 are, are that the LED lamp group of 380mA is an example with the current value, and after energising a period of time, the control switch module disconnects a period of time to the sharing control chip in this LED lamp group.The length of concrete time is relevant with the precision of sharing control chip, and the purpose of this step is to make in the one-period of turn-on and turn-off formation, and the average of electric current is 350mA on the LED lamp group.The process of this adjustment is a dynamic process.The time that sharing control chip controls switch module turn-offs not is what settle at one go, constantly adjusts the turn-off time but constantly gather current value.
Adopt the present invention to omit the cost that DC/DC module in the existing LED lighting circuit has effectively reduced product.Well solved the high problem of available circuit energy consumption by the pattern that only adopts the current value on one-level conversion and the dynamic LED of the adjustment lamp group simultaneously.
Should be understood that application of the present invention is not limited to above-mentioned giving an example, for those of ordinary skills, can be improved according to the above description or conversion that all these improvement and conversion all should belong to the protection range of claims of the present invention.
Claims (9)
1. a LED lighting circuit current-sharing control method is characterized in that, may further comprise the steps:
S100: gather the current value on each LED lamp group;
S200: judging whether to exist the LED lamp group of current value less than predetermined current value, is execution in step S300 then, otherwise execution in step S400;
S300: then output promotes the control signal of the input voltage of LED lamp group, makes current value on each LED lamp group all more than or equal to predetermined current value;
S400:, make that the average current on the LED lamp group equals predetermined current value in the total time that turn-on and turn-off form by giving each control signal that the output of LED lamp group can independently be turn-offed its circuit.
2. LED lighting circuit current-sharing control method according to claim 1, it is characterized in that, if the current value of all LED lamp groups is all greater than predetermined current value, then before execution in step S400 earlier control AC/DC module reduce output voltage, make the current value of one of them LED lamp group reach after the predetermined current value execution in step S400 again.
3. a LED lighting circuit sharing control chip is characterized in that, described sharing control chip is by adopting as the function of the method realization sharing control of claim 1 or 2 described in any one.
4. a LED lighting circuit equalizing control circuit is characterized in that, comprises AC/DC module, sharing control chip, LED lamp group, switch module, sampling module peace sliding formwork piece, and the input of described AC/DC module connects alternating current, and output connects LED lamp group; The corresponding switch module of each LED lamp group, a sampling module and a level and smooth module, described switch module and described sampling module successively are connected in series on each LED lamp group; The control end of described switch module is connected to the sharing control chip, and the sampling end of described sampling module is connected to described level and smooth module, and the output of described level and smooth module is connected to the sharing control chip; Described sharing control chip also connects described AC/DC module.
5. LED lighting circuit equalizing control circuit according to claim 4 is characterized in that, described LED lamp group is a plurality of, and a plurality of LED lamp groups are connected in parallel on the output of described AC/DC module.
6. LED lighting circuit equalizing control circuit according to claim 4 is characterized in that described switch module is a field effect transistor.
7. LED lighting circuit equalizing control circuit according to claim 4 is characterized in that described sampling module is a resistance.
8. LED lighting circuit equalizing control circuit according to claim 4 is characterized in that described level and smooth module is a resistance-capacitance circuit.
9. LED lighting circuit equalizing control circuit according to claim 4 is characterized in that, described sharing control chip is a MCU chip.
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| CN2010105661407A CN102014561B (en) | 2010-11-30 | 2010-11-30 | Current sharing control method, chip and circuit of LED lighting circuit |
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| CN2010105661407A CN102014561B (en) | 2010-11-30 | 2010-11-30 | Current sharing control method, chip and circuit of LED lighting circuit |
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| CN102014561A true CN102014561A (en) | 2011-04-13 |
| CN102014561B CN102014561B (en) | 2013-08-14 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103415103A (en) * | 2013-05-31 | 2013-11-27 | 东南大学 | High-lighting-effect LED current-sharing circuit capable of independent dimming |
| CN103458572A (en) * | 2013-08-21 | 2013-12-18 | 青岛海信电器股份有限公司 | LED drive method, LED drive system and display device |
| CN103458578A (en) * | 2013-08-27 | 2013-12-18 | 青岛海信电器股份有限公司 | Light-emitting diode (LED) driving system and method and LED display device |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101569025A (en) * | 2007-03-15 | 2009-10-28 | 罗姆股份有限公司 | Light Emitting diode driving apparatus |
| CN101742768A (en) * | 2008-11-18 | 2010-06-16 | 赛普拉斯半导体公司 | Compensation method and circuit for line rejection enhancement |
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2010
- 2010-11-30 CN CN2010105661407A patent/CN102014561B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101569025A (en) * | 2007-03-15 | 2009-10-28 | 罗姆股份有限公司 | Light Emitting diode driving apparatus |
| CN101742768A (en) * | 2008-11-18 | 2010-06-16 | 赛普拉斯半导体公司 | Compensation method and circuit for line rejection enhancement |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103415103A (en) * | 2013-05-31 | 2013-11-27 | 东南大学 | High-lighting-effect LED current-sharing circuit capable of independent dimming |
| CN103415103B (en) * | 2013-05-31 | 2015-10-07 | 东南大学 | A kind of specular removal can the LED flow equalizing circuit of independent dimming |
| CN103458572A (en) * | 2013-08-21 | 2013-12-18 | 青岛海信电器股份有限公司 | LED drive method, LED drive system and display device |
| CN103458578A (en) * | 2013-08-27 | 2013-12-18 | 青岛海信电器股份有限公司 | Light-emitting diode (LED) driving system and method and LED display device |
| CN103458578B (en) * | 2013-08-27 | 2015-05-13 | 青岛海信电器股份有限公司 | Light-emitting diode (LED) driving system and method and LED display device |
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| CN102014561B (en) | 2013-08-14 |
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Address after: 518110 Guangdong city of Shenzhen province Baoan District Guanlan Street Library pit Jingquan Industrial Park Applicant after: Shenzhen JingQuanHua Electronics Co., Ltd. Address before: 518110 Guangdong city of Shenzhen province Baoan District Guanlan Street Library pit Jingquan Industrial Park Applicant before: Shenzhen Jingquanhua Electronics Co., Ltd. |
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