CN204069457U - A kind of LED constant-current circuit - Google Patents
A kind of LED constant-current circuit Download PDFInfo
- Publication number
- CN204069457U CN204069457U CN201420617448.3U CN201420617448U CN204069457U CN 204069457 U CN204069457 U CN 204069457U CN 201420617448 U CN201420617448 U CN 201420617448U CN 204069457 U CN204069457 U CN 204069457U
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- resistance
- electric capacity
- amplifier
- current
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Abstract
The utility model discloses a kind of LED constant-current circuit, and it comprises the first resistance, the second resistance, the 3rd resistance, the 4th resistance, the 5th resistance, the 6th resistance, the 7th resistance, the 8th resistance, the 9th resistance, the tenth resistance, the 11 resistance, the first electric capacity, the second electric capacity, the 3rd electric capacity, the 4th electric capacity, the 5th electric capacity, the 6th electric capacity, the first amplifier, the second amplifier, optocoupler light-emitting diode and AP4310 chip.The utility model LED constant-current circuit adopts the dual output pressure limiting of voltage and current, and after voltage reaches voltage limiting value, voltage control effect, Current Control is inoperative, and after electric current reaches electric current voltage limiting value, Current Control effect, circuit working is in constant current state.Adopt the utility model circuit, LED constant current is controlled more stable.
Description
Technical field
The utility model relates to LED technical field, particularly relates to a kind of LED constant-current circuit.
Background technology
When LED drives at less forward voltage, LED is operated in dead zone voltage, produces forward current hardly, and now LED can not be luminous.Along with forward voltage increases, LED volt-ampere Tequ line enters flex point, and forward current increases, and LED is luminous.
But increase further along with forward voltage, the LED forward current entering flex point district exponentially can increase along with the supercharging of voltage.In LED luminescence process, itself temperature also rises, and temperature rises and the forward voltage of PN junction is declined, and electric current is increased further, and electric current makes again temperature raise further after increasing, and causes vicious circle, LED is burnt.
Utility model content
Technical problem to be solved in the utility model is, for the above-mentioned deficiency of prior art, proposes the LED constant-current circuit that a kind of electric current making to export to LED is constant current.
The technical scheme that the utility model solves the employing of its technical problem is, propose a kind of LED constant-current circuit, it comprises the first resistance, the second resistance, the 3rd resistance, the 4th resistance, the 5th resistance, the 6th resistance, the 7th resistance, the 8th resistance, the 9th resistance, the tenth resistance, the 11 resistance, the first electric capacity, the second electric capacity, the 3rd electric capacity, the 4th electric capacity, the 5th electric capacity, the 6th electric capacity, the first amplifier, the second amplifier, optocoupler light-emitting diode and AP4310 chip; Access the former limit of LED output and transformation side after described first electric capacity and the second Capacitance parallel connection, described first resistance one end is connected with the first electric capacity negative pole, and the other end is connected with the second electric capacity negative pole; The second capacitance cathode is accessed in described second resistance one end, and the other end accesses the first amplifier negative pole; The first amplifier negative pole is accessed in described 3rd resistance one end, other end access AP4310 chip; With the 3rd Capacitance parallel connection after described 4th resistance and the 4th capacitances in series, described 3rd electric capacity one end is accessed the first amplifier output other end and is accessed the first amplifier negative pole; Described first amplifier positive pole access AP4310 chip; Described 5th resistance one end access AP4310 chip other end access power supply; Described 7th resistance one end access power supply, other end access optocoupler light-emitting diode; Described 6th resistance is in parallel with optocoupler light-emitting diode; The described optocoupler light-emitting diode other end is connected with the first amplifier output; Described second amplifier output is connected with the first amplifier output; With the 5th Capacitance parallel connection after described 11 resistance and the 6th capacitances in series; The second amplifier output is accessed in described 5th electric capacity one end, and the other end accesses the second amplifier negative pole; The first electric capacity negative pole is accessed in described 8th resistance one end, and another accesses the second amplifier positive pole; The second amplifier positive pole is accessed in described tenth resistance one end, accesses AP4310 chip after other end series connection the 9th resistance.
The utility model LED constant-current circuit adopts the dual output pressure limiting of voltage and current, and after voltage reaches voltage limiting value, voltage control effect, Current Control is inoperative, and after electric current reaches electric current voltage limiting value, Current Control effect, circuit working is in constant current state.Adopt the utility model circuit, LED constant current is controlled more stable.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of the utility model LED constant-current circuit.
Embodiment
Be below specific embodiment of the utility model and by reference to the accompanying drawings, the technical solution of the utility model is further described, but the utility model be not limited to these embodiments.
Please refer to Fig. 1, the utility model LED constant-current circuit, it comprises the first resistance R1, the second resistance R2, the 3rd resistance R3, the 4th resistance R4, the 5th resistance R5, the 6th resistance R6, the 7th resistance R7, the 8th resistance R8, the 9th resistance R9, the tenth resistance R10, the 11 resistance R11, the first electric capacity C1, the second electric capacity C2, the 3rd electric capacity C3, the 4th electric capacity C4, the 5th electric capacity C5, the 6th electric capacity C6, the first amplifier U1A, the second amplifier U1B, optocoupler light-emitting diode U3 and AP4310 chip U2.
Access the former limit of LED output and transformation side after described first electric capacity C1 and the second electric capacity C2 parallel connection, described first resistance R1 one end is connected with the first electric capacity C1 negative pole, and the other end is connected with the second electric capacity C2 negative pole; The second electric capacity C2 positive pole is accessed in described second resistance R2 one end, and the other end accesses the first amplifier U1A negative pole; The first amplifier U1A negative pole is accessed in described 3rd resistance R3 one end, other end access AP4310 chip U2; In parallel with the 3rd electric capacity C3 after described 4th resistance R4 connects with the 4th electric capacity C4, described 3rd electric capacity C3 one end is accessed the first amplifier U1A output other end and is accessed the first amplifier U1A negative pole; Described first amplifier U1A positive pole access AP4310 chip.
Described 5th resistance R5 one end access AP4310 chip U2 other end access power supply VCC; Described 7th resistance R7 one end access power supply VCC, other end access optocoupler light-emitting diode U2; Described 6th resistance R6 is in parallel with optocoupler light-emitting diode U2; The described optocoupler light-emitting diode U2 other end is connected with the first amplifier U1A output.
Described second amplifier U1B output is connected with the first amplifier U1A output; It is in parallel with the 5th electric capacity C5 after described 11 resistance R11 connects with the 6th electric capacity C6; The second amplifier U1B output is accessed in described 5th electric capacity C5 one end, and the other end accesses the second amplifier U1B negative pole; The first electric capacity C1 negative pole is accessed in described 8th resistance R8 one end, and another accesses the second amplifier U1B positive pole; The second amplifier U1B positive pole is accessed in described tenth resistance R10 one end, accesses AP4310 chip after other end series connection the 9th resistance R9.
In this circuit, the first amplifier U1A completes voltage control, and the second amplifier U1B completes current constant control.Relatively rear signal is amplified output by the first amplifier U1A, and the electric current controlled on optocoupler diode U3 changes feedback quantity and ensures output voltage stabilization.Wherein the voltage that compares of the first amplifier U1A is provided to reference voltage needed for the first amplifier U1A for AP4310 chip, and the second resistance R2 and the 3rd resistance R3 is to the sampled voltage of reference voltage pressure limiting and sampling resistor R1.
Signal after is relatively amplified the electric current controlled on optocoupler diode U3 and changes feedback quantity and ensure outputting current steadily by the second amplifier U1B equally.The voltage that wherein the second amplifier compares is the reference voltage value that AP4310 chip is supplied to the second amplifier U1B, and this reference voltage value is through the sampled voltage of the 8th resistance R8, the 9th resistance R9, the tenth resistance R10 step-down and sampling resistor R1.
5th resistance R5, the 7th resistance R7 are for limiting lowest high-current value, and the 6th resistance R6 is for ensureing that optocoupler light-emitting diode U3 has minimum current value.3rd electric capacity C3, the 4th electric capacity C4, the 4th resistance R4 and the 5th electric capacity C5, the 6th electric capacity C6, the 11 resistance R11 all form compensating network, compensate for system transter.
Specific embodiment described herein is only to the explanation for example of the utility model spirit.The utility model person of ordinary skill in the field can make various amendment or supplements or adopt similar mode to substitute to described specific embodiment, but can't depart from spirit of the present utility model or surmount the scope that appended claims defines.
Claims (1)
1. a LED constant-current circuit, is characterized in that: comprise the first resistance, the second resistance, the 3rd resistance, the 4th resistance, the 5th resistance, the 6th resistance, the 7th resistance, the 8th resistance, the 9th resistance, the tenth resistance, the 11 resistance, the first electric capacity, the second electric capacity, the 3rd electric capacity, the 4th electric capacity, the 5th electric capacity, the 6th electric capacity, the first amplifier, the second amplifier, optocoupler light-emitting diode and AP4310 chip; Access the former limit of LED output and transformation side after described first electric capacity and the second Capacitance parallel connection, described first resistance one end is connected with the first electric capacity negative pole, and the other end is connected with the second electric capacity negative pole; The second capacitance cathode is accessed in described second resistance one end, and the other end accesses the first amplifier negative pole; The first amplifier negative pole is accessed in described 3rd resistance one end, other end access AP4310 chip; With the 3rd Capacitance parallel connection after described 4th resistance and the 4th capacitances in series, described 3rd electric capacity one end is accessed the first amplifier output other end and is accessed the first amplifier negative pole; Described first amplifier positive pole access AP4310 chip; Described 5th resistance one end access AP4310 chip other end access power supply; Described 7th resistance one end access power supply, other end access optocoupler light-emitting diode; Described 6th resistance is in parallel with optocoupler light-emitting diode; The described optocoupler light-emitting diode other end is connected with the first amplifier output; Described second amplifier output is connected with the first amplifier output; With the 5th Capacitance parallel connection after described 11 resistance and the 6th capacitances in series; The second amplifier output is accessed in described 5th electric capacity one end, and the other end accesses the second amplifier negative pole; The first electric capacity negative pole is accessed in described 8th resistance one end, and another accesses the second amplifier positive pole; The second amplifier positive pole is accessed in described tenth resistance one end, accesses AP4310 chip after other end series connection the 9th resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420617448.3U CN204069457U (en) | 2014-10-23 | 2014-10-23 | A kind of LED constant-current circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420617448.3U CN204069457U (en) | 2014-10-23 | 2014-10-23 | A kind of LED constant-current circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204069457U true CN204069457U (en) | 2014-12-31 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420617448.3U Expired - Fee Related CN204069457U (en) | 2014-10-23 | 2014-10-23 | A kind of LED constant-current circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204069457U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106851909A (en) * | 2017-02-09 | 2017-06-13 | 中山自信照明科技有限公司 | LED illumination lamp constant-current circuit |
-
2014
- 2014-10-23 CN CN201420617448.3U patent/CN204069457U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106851909A (en) * | 2017-02-09 | 2017-06-13 | 中山自信照明科技有限公司 | LED illumination lamp constant-current 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 |
Granted publication date: 20141231 Termination date: 20171023 |
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| CF01 | Termination of patent right due to non-payment of annual fee |