CN202565534U - Simple multiplexed output LED control circuit - Google Patents
Simple multiplexed output LED control circuit Download PDFInfo
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- CN202565534U CN202565534U CN2012201955730U CN201220195573U CN202565534U CN 202565534 U CN202565534 U CN 202565534U CN 2012201955730 U CN2012201955730 U CN 2012201955730U CN 201220195573 U CN201220195573 U CN 201220195573U CN 202565534 U CN202565534 U CN 202565534U
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Abstract
The utility model provides a simple multiplexed output LED control circuit. The control circuit comprises a single-output constant current source and multiplexed parallel output circuits, wherein each output circuit comprises a current equalizing circuit, a current equalizing control circuit, and a load composed of multiple LED lamps in series connection, one end of the load is connected with a positive output end of the constant current source, the other end of the load is connected with an input end of the current equalizing circuit, and the negative output end of the constant current source is connected to the ground. A first level of each linear adjusting tube is connected with an output end of the load, a second level of the linear adjusting tube is connected with one end of a sampling resistor, a control level of the linear adjusting tube is connected with a control signal output end of the current equalizing control circuit, and the other end of the sampling resistor is connected to the ground. According to the simple multiplexed output LED control circuit, structures of the main circuit and the control circuits are simple, and the cost is low; the multiplexed constant current control circuit is independent of the single-output constant current source, which can be used as an independent module with wide application and good effects.
Description
Technical field
The utility model relates to a kind of LED control circuit, and especially a kind of constant current protective circuit that is used for the multi-path parallel LEDs circuit belongs to the LED technical field.
Background technology
Ripe gradually along with LED technology, LED be because its advantages of energy saving and environmental protection replaces traditional light source gradually, in daily life, production, and is widely used in the industry, commercial application.The multiple constant current led circuit is great power LED equipment a kind of circuit commonly used, and the application in real life is the most extensive.For the method for LED multiple constant current control, common persevering pressing mold piece adds multichannel non-isolation DC/DC constant-current circuit; And the adjustable Voltage stabilizing module of voltage adds multi-route property adjustment constant-current circuit.
For first method, the output of constant voltage module is as the input of multiple constant current circuit, and every road constant-current circuit is done constant current control separately; Be easy to guarantee the current-sharing of multichannel output current; But since every road constant-current source need an independent control the DC/DC converter, so complicated circuit, cost is high.For second method; Do linear adjustment with metal-oxide-semiconductor or triode and realize multiple constant current control, the output voltage of prime Voltage stabilizing module is followed the linear adjustment of back level constant current circuit, and the output voltage of Voltage stabilizing module is all the time than the highest Lu Lvegao of output voltage in the multi-channel linear adjustment constant-current circuit; Make linear adjustment circuit can realize that in the output of every road the power consumption on the basis of accurate constant current control is approaching all the time minimum; Though this method circuit cost is low, the current sharing on every road is good, and it is selective that the adjustable prime Voltage stabilizing module of voltage that can realize the control of above-mentioned voltage follow does not generally have ready-made reference power supply; Need customized development, design cost is high.
The utility model content
The utility model promptly is to the existing the problems referred to above of present multi-path parallel LEDs constant-current circuit, provides a kind of usefulness simple constant current protective circuit, realizes the well behaved multichannel output of current-sharing LED constant current control.
Specifically; The described simple multichannel output LED control circuit of the utility model; The output circuit that comprises a single output constant-current source and multi-channel parallel, the load that described each output circuit includes a flow equalizing circuit, an equalizing control circuit and is composed in series by a plurality of LED lamps, the output plus terminal of described load one termination constant-current source; The input of another termination flow equalizing circuit, the output negativing ending grounding of said constant-current source.
Further, described flow equalizing circuit comprises a sample resistance and a linear adjustment pipe, the input of the said equalizing control circuit of output termination of linear adjustment pipe.
Further, described linear adjustment pipe is MOSFET or triode.
Metal-oxide layer-semiconductor-field-effect transistor abbreviates metal-oxide half field effect transistor as, and (Mctal-Oxide-Semiconductor Field-Effect Transistor MOSFET) is a kind of field-effect transistor (field-effect transistor) that can be widely used in analog circuit and digital circuit.MOSFET is different according to the polarity of its " passage ", can be divided into the MOSFET of n-type and p-type, is called NMOSFET and PMOSFET usually again, and other are called for short and still comprise NMOS FET, PMOS FET, nMOSFET, pMOSFET etc.
Further, the first order of described linear adjustment pipe connects the output of load, and the second level accesses an end of kind resistance, and controlled stage connects the control signal output ends of equalizing control circuit, the other end ground connection of sample resistance.
The input of described every way equalizing control circuit is from the sampled signal of this road sample resistance to output current; Through becoming public connecting line after the conversion of this road flow equalizing circuit and other each road links together, become the current-sharing bus; Every road current sampling signal and current-sharing bus voltage are after equalizing control circuit inside compares adjusting; The linearity of the flow equalizing circuit that the output signal may command of equalizing control circuit is corresponding is adjusted the impedance magnitude of pipe, thereby controls the size of every road electric current, realizes current-sharing.
The described simple multichannel output LED control circuit of the utility model has following advantage:
1, main circuit and control circuit are simple in structure, and cost is low;
2, multichannel constant-current control circuit is independent of single output constant-current source; Can be used as module independently uses; Be applicable to level multiple constant current control behind the single channel constant-current supply of standard; When prime single channel constant-current source need change the current stabilization value because of light modulation, multichannel output constant-current control circuit still can keep every road electric current to divide equally automatically.
Description of drawings
Fig. 1 is the circuit theory diagrams of the utility model.
Embodiment
Below in conjunction with accompanying drawing, the described simple multichannel output LED control circuit of the utility model is described, purpose is better understood described technology contents for the public, but not it is carried out any type of restriction.All with identical or approximate principle, to the improvement that said protective circuit is carried out, be purpose, then all within the utility model technical scheme required for protection to realize constructed effect.
Like Fig. 1; The described simple multichannel output LED control circuit of the utility model; The output circuit that comprises a single output constant-current source and multi-channel parallel, the load that described each output circuit includes a flow equalizing circuit, an equalizing control circuit and is composed in series by a plurality of LED lamps, the output plus terminal of described load one termination constant-current source; The input of another termination flow equalizing circuit, the output negativing ending grounding of said constant-current source; Further, described flow equalizing circuit comprises a sample resistance and a linear adjustment pipe, the input of the said equalizing control circuit of output termination of linear adjustment pipe; The first order of described linear adjustment pipe connects the output of load; The second level accesses an end of kind resistance, and controlled stage connects the control signal output ends of equalizing control circuit, the other end ground connection of sample resistance; The input of described every way equalizing control circuit is from the sampled signal of this road sample resistance to output current; Through becoming public connecting line after the conversion of this road flow equalizing circuit and other each road links together, become the current-sharing bus; Every road current sampling signal and current-sharing bus voltage are after equalizing control circuit inside compares adjusting; The linearity of the flow equalizing circuit that the output signal may command of equalizing control circuit is corresponding is adjusted the impedance magnitude of pipe, thereby controls the size of every road electric current, realizes current-sharing.
The described simple multichannel output LED control circuit of the utility model, main circuit and control circuit are simple in structure, and cost is low; Multichannel constant-current control circuit is independent of single output constant-current source; Can be used as module independently uses; Be applicable to level multiple constant current control behind the single channel constant-current supply of standard, when prime single channel constant-current source need change the current stabilization value because of light modulation, multichannel output constant-current control circuit still can keep every road electric current to divide equally automatically; Be widely used, effective.
Claims (4)
1. a simple multichannel is exported the LED control circuit; It is characterized in that: the output circuit that comprises a single output constant-current source and multi-channel parallel; The load that described each output circuit includes a flow equalizing circuit, an equalizing control circuit and is composed in series by a plurality of LED lamps; The output plus terminal of described load one termination constant-current source, the input of another termination flow equalizing circuit, the output negativing ending grounding of said constant-current source.
2. simple multichannel output LED control circuit according to claim 1 is characterized in that: described flow equalizing circuit comprises a sample resistance and a linear adjustment pipe, the input of the said equalizing control circuit of output termination of linear adjustment pipe.
3. simple multichannel output LED control circuit according to claim 1 and 2, it is characterized in that: described linear adjustment pipe is MOSFET or triode.
4. simple multichannel output LED control circuit according to claim 1 and 2; It is characterized in that: the first order of described linear adjustment pipe connects the output of load; The second level accesses an end of kind resistance; Controlled stage connects the control signal output ends of equalizing control circuit, the other end ground connection of sample resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012201955730U CN202565534U (en) | 2012-05-02 | 2012-05-02 | Simple multiplexed output LED control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012201955730U CN202565534U (en) | 2012-05-02 | 2012-05-02 | Simple multiplexed output LED control circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202565534U true CN202565534U (en) | 2012-11-28 |
Family
ID=47215128
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012201955730U Expired - Fee Related CN202565534U (en) | 2012-05-02 | 2012-05-02 | Simple multiplexed output LED control circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202565534U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105934029A (en) * | 2016-05-30 | 2016-09-07 | 西安电子科技大学 | Multi-path LED constant current drive circuit |
| CN110099474A (en) * | 2018-01-30 | 2019-08-06 | 帝奥微电子有限公司 | LED multi-channel parallel driving circuit |
-
2012
- 2012-05-02 CN CN2012201955730U patent/CN202565534U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105934029A (en) * | 2016-05-30 | 2016-09-07 | 西安电子科技大学 | Multi-path LED constant current drive circuit |
| CN105934029B (en) * | 2016-05-30 | 2017-11-17 | 西安电子科技大学 | A kind of multipath LED constant current drive circuit |
| CN110099474A (en) * | 2018-01-30 | 2019-08-06 | 帝奥微电子有限公司 | LED multi-channel parallel driving circuit |
| CN110099474B (en) * | 2018-01-30 | 2021-09-07 | 江苏帝奥微电子股份有限公司 | LED multi-path parallel driving circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| 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: 20121128 Termination date: 20190502 |