CN202353874U - Light emitting diode (LED) linear constant-current control circuit and LED linear circuit - Google Patents
Light emitting diode (LED) linear constant-current control circuit and LED linear circuit Download PDFInfo
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- CN202353874U CN202353874U CN2011204585711U CN201120458571U CN202353874U CN 202353874 U CN202353874 U CN 202353874U CN 2011204585711 U CN2011204585711 U CN 2011204585711U CN 201120458571 U CN201120458571 U CN 201120458571U CN 202353874 U CN202353874 U CN 202353874U
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- led
- control circuit
- current control
- linear constant
- input voltage
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Abstract
The utility model discloses a light emitting diode (LED) linear constant-current control circuit which comprises an input voltage sampling network for sampling input voltage, a comparison and logic control circuit for comparing voltage sampled by the input voltage sampling network with threshold voltage and outputting a comparison result, a multichannel selective switch for controlling part or all of LEDs to be switched on according to the comparison result, and a current control loop for controlling current flowing through the LEDs. The utility model also discloses an LED linear circuit.
Description
Technical field
The utility model relates to the linear constant-current control circuit of a kind of LED, relates in particular to a kind of linear constant-current control circuit that can regulate LED brightness through change input controllable silicon dimmer cut angular dimension.
Background technology
Fig. 1 is traditional linear constant-current control circuit of LED.The LED lamp is series-connected to the anode of input rectifying bridge 100 among the figure, through one be connected to input rectifying bridge 100 ground ends linear constant-current source 102 set the electric current that flows through LED.The position of LED200 and linear constant-current source 102 can exchange each other.
Because LED lamp string is in series by a lot of LED200, so forward conduction voltage is very high.According to the principle of LED conducting, only when input voltage was higher than LED200 forward conduction voltage, LED lamp string just can be lighted.In the system of mains-supplied, LED lamp string only just can be lighted near input voltage reaches peak value, so the utilance of LED is very low, power factor is not high yet.If reduce the LED lamp quantity of series connection, though can increase the utilance of LED, the power consumption of constant-current control circuit is increased greatly, thereby reduce the efficient of whole drive circuit, increase the temperature rise of drive circuit.If the electric current when increase LED lamp is lighted though can improve the brightness of LED, then need adopt more high-power LED, thereby increase the cost of system, system power dissipation also can increase along with the increase of LED drive current.
The utility model content
In order to overcome the defective that exists in the prior art, the utility model provides a kind of LED linear constant-current control circuit, can light all or part of LED according to the size of input voltage, thereby improves the utilance of LED.
In order to realize above-mentioned utility model purpose, the utility model provides a kind of LED linear constant-current control circuit, and comprising: an input voltage sampling network is used to the input voltage of sampling; One comparison and logic control circuit are exported a comparative result according to the sampled voltage and a threshold voltage of this input voltage sampling network; One multidiameter option switch is used for according to this comparative result control section or all LED conductings.The linear constant-current control circuit of this LED also comprises a current controlled circuit, is used for the electric current of control flows through this LED.When input voltage hangs down, partial L ED conducting; When input voltage is high, all LED conductings.
Further, this input voltage sampling network comprises at least one divider resistance.This input voltage sampling network comprises first, second and the 3rd divider resistance, this first, second, third divider resistance series connection.
Further, the input of this multidiameter option switch all is connected with this current controlled circuit with output.This current controlled circuit comprises: a sampling resistor is used for the magnitude of voltage of acquisition stream through this LED; One operational amplifier is used for comparing with a reference voltage from the magnitude of voltage of this sampling resistor and the fault in enlargement signal; At least one metal-oxide-semiconductor is according to the comparative result conducting of this comparison and logic control circuit.
Further, the input anode of this operational amplifier is connected with this reference voltage, and input cathode is connected with this sampling resistor, and output is connected with this multidiameter option switch.The grid of this metal-oxide-semiconductor is connected with this multidiameter option switch, and source class is connected with this sampling resistor, and drain electrode is connected with the negative electrode of this LED.
The utility model discloses a kind of LED linear circuit simultaneously, comprising: rectifier bridge, the linear constant-current control circuit of LED and LED lamp string, the linear constant-current control circuit of this LED adopts the linear constant-current control circuit of LED as indicated above.
Compared with prior art, the utility model adopts the block switch technology, when input voltage is low, just can light partial L ED.Therefore can not reduce LED quantity or not increase under the prerequisite of LED electric current, in the whole cycle, increase the time that LED is lighted, thereby improve the utilance and total output lumen number of LED.So the utility model has improved the efficient of drive circuit, increased the power factor of input power supply, reduced the cost of system.And, regulate LED brightness through changing input controllable silicon dimmer cut angular dimension.
Description of drawings
Can detail and appendedly graphicly further understood through following utility model about the advantage of the utility model and spirit.
Fig. 1 is traditional linear constant-current control circuit sketch map of LED;
Fig. 2 is the circuit diagram according to the linear constant-current control circuit of the shown LED of the utility model.
Embodiment
Specify the specific embodiment of the utility model below in conjunction with accompanying drawing.
The linear constant-current control circuit of traditional LED, LED lamp string only just can be lighted near input voltage reaches peak value.
The utility model provides a kind of LED linear constant-current control circuit, when input voltage is low, just can light partial L ED, thereby improves the utilance of LED.In order to realize this utility model purpose, the linear constant-current control circuit of a kind of LED is characterized in that comprise: the input voltage sampling network is used to the input voltage of sampling; Comparison and logic control circuit are exported a comparative result according to the sampled voltage and a threshold voltage of said input voltage sampling network; Multidiameter option switch is used for according to all or part of conducting LED of said comparative result.According to different input voltages, said comparison and logic control circuit are lighted the LED of varying number.When input voltage is low, has partial L ED and light; When input voltage is higher, thereby most of or whole LED lights the time that LED is lighted that increases, and improves the utilance and total lumen number of exporting of LED.
Below will combine Fig. 2 to specify the utility model.Fig. 2 is the enforcement circuit of the linear constant-current control circuit of the shown LED of the utility model, comprises input voltage sampling network 300, comparison and logic control circuit 500, operational amplifier OP1, current sampling resistor Rs, reference voltage V REF, a multidiameter option switch 400, a plurality of high-voltage power metal-oxide-semiconductor S1 ~ Sn and LED lamp string LED1 ~ LEDn.Wherein this input voltage sampling network 300 comprises at least one sampling resistor.In this execution mode, this voltage sample network 300 comprises the sampling resistor R1 ~ Rn of three series connection.This input voltage sampling network R1 ~ Rn is connected between the anode and ground end of rectifier bridge 100, is used to the input voltage of sampling.Its output EN_G1 ~ EN_Gn is connected to comparison and logic control circuit 500.Comparison and logic control circuit 500 will be compared with a threshold voltage from the sampled voltage of input voltage sampling network 300, the result of relatively back acquisition got into the control end of multidiameter option switch 400 as input.
The linear constant-current control circuit of the LED that the utility model provided can be lighted the LED of varying number according to different input voltages.When input voltage was very low, comparison and logic control circuit 500 output EN_G1 were effective, and other output EN_G2 ~ EN_Gn is invalid, so high-voltage power metal-oxide-semiconductor S1 is open-minded, S2 ~ Sn turn-offs.The electric current I that the electric current that LED1 flows through equals to set _ LED=VREF/Rs, LED2 ~ LEDn does not then have electric current to flow through.Otherwise when input voltage was very high, comparison and logic control circuit LC1 output EN_Gn were effective, and other output EN_G1 ~ EN_Gn-1 is invalid, so high-voltage power metal-oxide-semiconductor Sn is open-minded, S1 ~ Sn-1 turn-offs.LED1 ~ LEDn flows through identical electric current, the electric current I that equals to set _ LED=VREF/Rs.
In the system by mains-supplied, busbar voltage is an AC sine wave.The utility model can just be lighted partial L ED when input voltage is very low; When input voltage is high, then light whole LED.Should be understood that and adopt the block switch technology, the utility model can increase the time that LED is lighted in the whole cycle, thereby improves the utilance and total output lumen number of LED.
The preferred embodiment of the just the utility model described in this specification, above embodiment is only in order to the technical scheme of explanation the utility model but not to the restriction of the utility model.All those skilled in the art according to the design of the utility model through the available technical scheme of logical analysis, reasoning, or a limited experiment, all should be within the scope of the utility model.
Claims (10)
1. the linear constant-current control circuit of LED is characterized in that, comprising:
One input voltage sampling network is used to the input voltage of sampling;
One comparison and logic control circuit are exported a comparative result according to the sampled voltage and a threshold voltage of said input voltage sampling network;
One multidiameter option switch is used for according to said comparative result control section or all LED conductings.
2. the linear constant-current control circuit of LED as claimed in claim 1 is characterized in that, the linear constant-current control circuit of said LED also comprises a current controlled circuit, is used for the electric current of control flows through said LED.
3. the linear constant-current control circuit of LED as claimed in claim 1 is characterized in that said input voltage sampling network comprises at least one divider resistance.
4. the linear constant-current control circuit of LED as claimed in claim 1 is characterized in that, when input voltage hangs down, and partial L ED conducting; When input voltage is high, all LED conductings.
5. the linear constant-current control circuit of LED as claimed in claim 3 is characterized in that said input voltage sampling network comprises first, second and the 3rd divider resistance, said first, second, third divider resistance series connection.
6. the linear constant-current control circuit of LED as claimed in claim 2 is characterized in that the input of said multidiameter option switch all is connected with said current controlled circuit with output.
7. the linear constant-current control circuit of LED as claimed in claim 2 is characterized in that said current controlled circuit comprises:
One sampling resistor is used for the magnitude of voltage of acquisition stream through said LED;
One operational amplifier is used for comparing with a reference voltage from the magnitude of voltage of said sampling resistor and the fault in enlargement signal;
At least one metal-oxide-semiconductor is according to the comparative result conducting of said comparison and logic control circuit.
8. the linear constant-current control circuit of LED as claimed in claim 7 is characterized in that the input anode of said operational amplifier is connected with said reference voltage, and input cathode is connected with said sampling resistor, and output is connected with said multidiameter option switch.
9. the linear constant-current control circuit of LED as claimed in claim 7 is characterized in that the grid of said metal-oxide-semiconductor is connected with said multidiameter option switch, and source class is connected with said sampling resistor, and drain electrode is connected with the negative electrode of said LED.
10. LED linear circuit comprises: rectifier bridge, the linear constant-current control circuit of LED and LED lamp string is characterized in that the linear constant-current control circuit of said LED adopts as each described LED linearity constant-current control circuit of claim 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204585711U CN202353874U (en) | 2011-11-18 | 2011-11-18 | Light emitting diode (LED) linear constant-current control circuit and LED linear circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204585711U CN202353874U (en) | 2011-11-18 | 2011-11-18 | Light emitting diode (LED) linear constant-current control circuit and LED linear circuit |
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| Publication Number | Publication Date |
|---|---|
| CN202353874U true CN202353874U (en) | 2012-07-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011204585711U Expired - Lifetime CN202353874U (en) | 2011-11-18 | 2011-11-18 | Light emitting diode (LED) linear constant-current control circuit and LED linear circuit |
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| CN (1) | CN202353874U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103687164A (en) * | 2012-09-18 | 2014-03-26 | 瑞鼎科技股份有限公司 | LED driving device and operating method thereof |
| CN103874260A (en) * | 2012-12-07 | 2014-06-18 | 普诚科技股份有限公司 | Lighting system and control method thereof |
| CN103906314A (en) * | 2014-03-04 | 2014-07-02 | 华南理工大学 | LED drive circuit and method based on voltage memory and segmented current limiting |
| CN104023435A (en) * | 2014-05-14 | 2014-09-03 | 华南理工大学 | Novel LED circuit |
| CN107949105A (en) * | 2017-11-21 | 2018-04-20 | 深圳市明微电子股份有限公司 | Constant current driver circuit for LED and lamps and lanterns |
-
2011
- 2011-11-18 CN CN2011204585711U patent/CN202353874U/en not_active Expired - Lifetime
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103687164A (en) * | 2012-09-18 | 2014-03-26 | 瑞鼎科技股份有限公司 | LED driving device and operating method thereof |
| TWI495394B (en) * | 2012-09-18 | 2015-08-01 | Raydium Semiconductor Corp | Led driving apparatus and operating method thereof |
| CN103874260A (en) * | 2012-12-07 | 2014-06-18 | 普诚科技股份有限公司 | Lighting system and control method thereof |
| CN103906314A (en) * | 2014-03-04 | 2014-07-02 | 华南理工大学 | LED drive circuit and method based on voltage memory and segmented current limiting |
| CN103906314B (en) * | 2014-03-04 | 2016-05-04 | 华南理工大学 | LED drive circuit and method based on voltage memory with segmentation current limliting |
| CN104023435A (en) * | 2014-05-14 | 2014-09-03 | 华南理工大学 | Novel LED circuit |
| CN107949105A (en) * | 2017-11-21 | 2018-04-20 | 深圳市明微电子股份有限公司 | Constant current driver circuit for LED and lamps and lanterns |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP03 | Change of name, title or address | ||
| CP03 | Change of name, title or address |
Address after: 5 room 504-511, room 2, Lane 666, Zhang Heng Road, Pudong New Area, China (Shanghai) free trade zone, Shanghai, China () Patentee after: Shanghai semiconducto Limited by Share Ltd Address before: 201204 Shanghai city Pudong New Area in 299 Lane Road, Room 502 No. 6 Patentee before: Shanghai Bright Power Semiconductor Co.,Ltd. |
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| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20120725 |