CN211457460U - Linear constant current drive circuit of LED illumination - Google Patents
Linear constant current drive circuit of LED illumination Download PDFInfo
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- CN211457460U CN211457460U CN201922438651.XU CN201922438651U CN211457460U CN 211457460 U CN211457460 U CN 211457460U CN 201922438651 U CN201922438651 U CN 201922438651U CN 211457460 U CN211457460 U CN 211457460U
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Abstract
The utility model provides a LED lighting linear constant current driving circuit, the anode of an LED unit is connected with the positive output end of a rectifier DB 1; the negative pole is connected with the current input end of the linear current source U1; the positive electrode of the energy storage unit C1 is connected with the positive output end of the rectifier DB 1; the negative electrode is in one-way conduction connection with one end of the current-limiting resistor R2 and is also in one-way conduction connection with the ground end GND; the other end of the current limiting resistor R2 is connected with the current output end of the linear current source U1; the discharge current-limiting circuit comprises a current-limiting resistor R1; one end of the current limiting resistor R1 is connected with the current setting end of the linear current source U1, and the end of the current limiting resistor R1 is also in one-way conduction with the cathode of the energy storage unit C1; the current limiting resistor R1 is connected to one end of the current limiting resistor R2. The LED drive circuit has the advantages that the energy storage device with smaller volume can be used, the current flowing through the LED unit in a wide input voltage range is always stable, and therefore stroboflash is reduced; meanwhile, the space and the cost required by the driving board are saved, and the LED driving board is better applied to some special lamp designs.
Description
Technical Field
The utility model belongs to a LED (light emitting diode) illumination field, in particular to linear constant current drive circuit of LED illumination.
Background
In LED lighting products, linear constant current driving schemes are widely adopted. Generally, on a linear constant-current-driven LED lighting device, in order to meet the related stroboscopic requirement, a conventional circuit needs an energy storage element with a large volume and a board distribution space, and can only work within a narrow input voltage range to achieve the stroboscopic requirement.
SUMMERY OF THE UTILITY MODEL
The to-be-solved problem of the utility model is to provide a linear constant current drive circuit of LED illumination, resistance when discharging through the increase to reduce discharge current, extension discharge time, finally reach and reduce the energy storage component volume, the installation of being convenient for. The low flash requirement can be maintained over a wide input voltage range. To overcome the disadvantages of the prior art.
The utility model provides a linear constant current drive circuit of LED illumination, include: the LED lamp comprises a rectifier BD1, an LED unit, an energy storage unit C1, a linear current source U1, a current limiting resistor R2 and a discharge current limiting circuit; wherein, the input end of the rectifier is connected with alternating current; the anode of the LED unit is connected with the positive output end of the rectifier DB 1; the cathode of the LED unit is connected with the current input end of a linear current source U1; the positive electrode of the energy storage unit C1 is connected with the positive output end of the rectifier DB 1; the negative electrode of the energy storage unit C1 is in one-way conduction connection with one end of the current limiting resistor R2, and the negative electrode of the energy storage unit C1 is also in one-way conduction connection with the ground end GND; the other end of the current limiting resistor R2 is connected with the current output end of the linear current source U1; the discharge current-limiting circuit comprises a current-limiting resistor R1; one end of the current limiting resistor R1 is connected with the current setting end of the linear current source U1, and the end of the current limiting resistor R1 is also in one-way conduction with the cathode of the energy storage unit C1; the current limiting resistor R1 is connected to one end of the current limiting resistor R2.
Further, the utility model provides a linear constant current drive circuit of LED illumination can also have such characteristic: also included is diode D3; the anode of the diode D3 is connected with the diode of the energy storage unit C1; the cathode of the diode D3 is connected to one end of the current limiting resistor R2 and the ground GND, respectively, to realize unidirectional conduction.
Further, the utility model provides a linear constant current drive circuit of LED illumination can also have such characteristic: the discharge current limiting circuit further includes a diode D2; the anode of the diode D2 is connected to one end of the current limiting resistor R1 and the current setting end of the linear current source U1, respectively; the cathode of the diode D2 is connected to the cathode of the energy storage unit C1 and the anode of the diode D3, respectively.
Further, the utility model provides a linear constant current drive circuit of LED illumination can also have such characteristic: when the voltage output by the rectifier is greater than the rated voltage of the LED unit; one path of output current of the rectifier BD1 passes through a current input end of the LED unit-linear current source U1-a current output end of the linear current source U1-a diode D2-a diode D3-a ground end GND; the control current at the current setting terminal of the linear current source U1 passes through the current limiting resistor R2 to the ground terminal GND.
Further, the utility model provides a linear constant current drive circuit of LED illumination can also have such characteristic: when the voltage output by the rectifier is smaller than the rated voltage of the LED unit, the energy storage unit C1 discharges, and the current flows from the current input end of the energy storage unit C1-LED unit-linear current source U1-the current output end of the linear current source U1-the diode D2-the energy storage unit C1; the control current of the current setting end of the linear current source U1 passes through the current limiting resistor R2, the current limiting resistor R1, the diode D2 and the energy storage unit C1.
Further, the utility model provides a linear constant current drive circuit of LED illumination can also have such characteristic: the current input end of the linear current source U1 is an OUT pin, the current output end is a GND pin, and the current setting end is a CS pin.
Further, the utility model provides a linear constant current drive circuit of LED illumination can also have such characteristic: the energy storage unit C1 is a capacitor.
The utility model provides a LED lighting linear constant current drive circuit, which can use an energy storage device with smaller volume to satisfy the requirement that the current flowing through the LED unit is stable all the time in a wide input voltage range, thereby reducing the stroboscopic; meanwhile, the space and the cost required by the driving board are saved, and the LED driving board is better applied to some special lamp designs.
Drawings
Fig. 1 is a circuit diagram of a linear constant current driving circuit for LED lighting.
Fig. 2 is a working state diagram of the LED lighting linear constant current driving circuit when the commercial power works.
Fig. 3 is a working state diagram of the LED lighting linear constant current driving circuit when the energy storage unit is discharged.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and specific embodiments.
Fig. 1 is a circuit diagram of a linear constant current driving circuit for LED lighting according to a first embodiment.
As shown in fig. 1, the LED lighting linear constant current driving circuit includes: the LED driving circuit comprises a rectifier BD1, an LED unit, an energy storage unit C1, a linear current source U1, a current limiting resistor R2 and a discharge current limiting circuit.
The input end of the rectifier is connected with alternating current. The anode of the LED unit is connected to the positive output terminal of the rectifier DB 1. The cathode of the LED unit is connected to the current input of a linear current source U1. The positive pole of the energy storage unit C1 is connected to the positive output of the rectifier DB 1. The negative electrode of the energy storage unit C1 is connected with one end of the current limiting resistor R2 in a one-way conduction mode, and the negative electrode of the energy storage unit C1 is also connected with the ground end GND in a one-way conduction mode. The other end of the current limiting resistor R2 is connected with the current output end of the linear current source U1. The discharge current limiting circuit includes a current limiting resistor R1. One end of the current limiting resistor R1 is connected with the current setting end of the linear current source U1, and the end of the current limiting resistor R1 is also in one-way conduction with the cathode of the energy storage unit C1. The current limiting resistor R1 is connected to one end of the current limiting resistor R2. The negative output terminal of the rectifier BD1 is grounded to the ground GND. The energy storage unit C1 is a capacitor.
In this embodiment, the LED lighting linear constant current driving circuit further includes a diode D3. The anode of the diode D3 is connected with the diode of the energy storage unit C1; the cathode of the diode D3 is connected to one end of the current limiting resistor R2 and the ground GND, respectively, to realize unidirectional conduction.
In this embodiment, the discharge current limiting circuit further includes a diode D2. The anode of the diode D2 is connected to one end of the current limiting resistor R1 and the current setting end of the linear current source U1, respectively; the cathode of the diode D2 is connected to the cathode of the energy storage unit C1 and the anode of the diode D3, respectively.
In this embodiment, the current input terminal of the linear current source U1 is the OUT pin, the current output terminal is the GND pin, and the current setting terminal is the CS pin. The current through the LED unit is controlled by a linear current source U1, which can be set by peripheral parameters. The linear current source U1 may be model L1013 or any other product with the same function.
When the voltage V + output by the rectifier is greater than the rated voltage Vled of the LED unit; the output current of the rectifier BD1 passes through the OUT terminal of the LED unit-linear current source U1-the GND terminal of the linear current source U1-the diode D2-the diode D3-the ground GND all the way; the control current at the CS terminal of the linear current source U1 passes through the current limiting resistor R2 to the ground terminal GND. At this time, the other path of the output current of the rectifier BD1 charges the energy storage unit C1.
When the voltage V + output by the rectifier is smaller than the rated voltage of the LED unit, the energy storage unit C1 discharges, and the current flows from the energy storage unit C1, the OUT end of the LED unit-linear current source U1, the GND end of the linear current source U1, the diode D2 and the energy storage unit C1. The control current of the CS end of the linear current source U1 passes through a current limiting resistor R2, a current limiting resistor R1, a diode D2 and an energy storage unit C1.
While the present invention has been described in detail with reference to the preferred embodiments thereof, it should be understood that the above description should not be taken as limiting the present invention.
Claims (7)
1. The linear constant current driving circuit for LED illumination is characterized in that: the LED drive circuit comprises a rectifier BD1, an LED unit, an energy storage unit C1, a linear current source U1, a current limiting resistor R2 and a discharge current limiting circuit;
wherein, the input end of the rectifier is connected with alternating current;
the anode of the LED unit is connected to the positive output terminal of the rectifier DB 1; the cathode of the LED unit is connected with the current input end of the linear current source U1;
the positive electrode of the energy storage unit C1 is connected with the positive output end of the rectifier DB 1; the negative electrode of the energy storage unit C1 is in one-way conduction connection with one end of the current limiting resistor R2, and the negative electrode of the energy storage unit C1 is also in one-way conduction connection with the ground end GND;
the other end of the current limiting resistor R2 is connected with the current output end of the linear current source U1;
the discharge current-limiting circuit comprises a current-limiting resistor R1; one end of the current limiting resistor R1 is connected with the current setting end of the linear current source U1, and the end of the current limiting resistor R1 is also in one-way conduction with the negative electrode of the energy storage unit C1; the current limiting resistor R1 is connected with one end of the current limiting resistor R2.
2. The LED lighting linear constant current drive circuit of claim 1, wherein: also included is diode D3;
the anode of the diode D3 is connected with the diode of the energy storage unit C1; the cathode of the diode D3 is respectively connected with one end of the current-limiting resistor R2 and the ground end GND, so that unidirectional conduction is realized.
3. The LED lighting linear constant current drive circuit of claim 2, wherein: wherein the discharge current limiting circuit further comprises a diode D2;
the anode of the diode D2 is connected to one end of the current limiting resistor R1 and the current setting end of the linear current source U1, respectively; the cathode of the diode D2 is connected to the cathode of the energy storage unit C1 and the anode of the diode D3, respectively.
4. The LED lighting linear constant current drive circuit of claim 1, wherein:
when the voltage output by the rectifier is greater than the rated voltage of the LED unit;
the output current of the rectifier BD1 passes all the way through the LED unit-the current input terminal of the linear current source U1-the current output terminal of the linear current source U1-diode D2-diode D3-ground GND;
the control current of the current setting end of the linear current source U1 passes through the current limiting resistor R2 to the ground end GND.
5. The LED lighting linear constant current drive circuit of claim 1, wherein:
when the voltage output by the rectifier is smaller than the rated voltage of the LED unit, the energy storage unit C1 discharges, and the current flows from the energy storage unit C1-the LED unit-the current input end of the linear current source U1-the current output end of the linear current source U1-the diode D2-the energy storage unit C1;
the control current of the current setting end of the linear current source U1 passes through a current limiting resistor R2, a current limiting resistor R1, a diode D2 and an energy storage unit C1.
6. The LED lighting linear constant current drive circuit of claim 1, wherein:
the current input end of the linear current source U1 is an OUT pin, the current output end is a GND pin, and the current setting end is a CS pin.
7. The LED lighting linear constant current drive circuit of claim 1, wherein: the energy storage unit C1 is a capacitor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922438651.XU CN211457460U (en) | 2019-12-30 | 2019-12-30 | Linear constant current drive circuit of LED illumination |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922438651.XU CN211457460U (en) | 2019-12-30 | 2019-12-30 | Linear constant current drive circuit of LED illumination |
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| Publication Number | Publication Date |
|---|---|
| CN211457460U true CN211457460U (en) | 2020-09-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922438651.XU Active CN211457460U (en) | 2019-12-30 | 2019-12-30 | Linear constant current drive circuit of LED illumination |
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| Country | Link |
|---|---|
| CN (1) | CN211457460U (en) |
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2019
- 2019-12-30 CN CN201922438651.XU patent/CN211457460U/en active Active
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