CN110944434A - Linear constant current drive circuit of LED illumination - Google Patents
Linear constant current drive circuit of LED illumination Download PDFInfo
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- CN110944434A CN110944434A CN201911396397.XA CN201911396397A CN110944434A CN 110944434 A CN110944434 A CN 110944434A CN 201911396397 A CN201911396397 A CN 201911396397A CN 110944434 A CN110944434 A CN 110944434A
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Abstract
The invention provides a linear constant current driving circuit for LED illumination, wherein 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 invention belongs to the field of LED (light emitting diode) illumination, and particularly relates to an LED illumination linear constant current driving circuit.
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.
Disclosure of Invention
The invention aims to solve the problem of providing an LED lighting linear constant current driving circuit, which reduces the discharge current and prolongs the discharge time by increasing the resistance during discharge, and finally achieves the purposes of reducing the volume of an energy storage element and facilitating installation. The low flash requirement can be maintained over a wide input voltage range. To overcome the disadvantages of the prior art.
The invention provides a linear constant current driving circuit for LED illumination, which comprises: 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 present invention provides a linear constant current driving circuit for LED lighting, which may further have the following features: 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 present invention provides a linear constant current driving circuit for LED lighting, which may further have the following features: 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 present invention provides a linear constant current driving circuit for LED lighting, which may further have the following features: 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 present invention provides a linear constant current driving circuit for LED lighting, which may further have the following features: 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 present invention provides a linear constant current driving circuit for LED lighting, which may further have the following features: 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 present invention provides a linear constant current driving circuit for LED lighting, which may further have the following features: the energy storage unit C1 is a capacitor.
According to the LED lighting linear constant current driving circuit, the energy storage device with smaller volume can be used, and the current flowing through the LED unit in a wide input voltage range is always stable, so that 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.
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 invention is further described below with reference to the following figures and specific examples.
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, it should be understood that the above description should not be taken as limiting the 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 |
|---|---|---|---|
| CN201911396397.XA CN110944434A (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 |
|---|---|---|---|
| CN201911396397.XA CN110944434A (en) | 2019-12-30 | 2019-12-30 | Linear constant current drive circuit of LED illumination |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110944434A true CN110944434A (en) | 2020-03-31 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911396397.XA Withdrawn CN110944434A (en) | 2019-12-30 | 2019-12-30 | Linear constant current drive circuit of LED illumination |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110944434A (en) |
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2019
- 2019-12-30 CN CN201911396397.XA patent/CN110944434A/en not_active Withdrawn
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Application publication date: 20200331 |
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