CN213938386U - Driving circuit with light emitting diode - Google Patents
Driving circuit with light emitting diode Download PDFInfo
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- CN213938386U CN213938386U CN202023323014.7U CN202023323014U CN213938386U CN 213938386 U CN213938386 U CN 213938386U CN 202023323014 U CN202023323014 U CN 202023323014U CN 213938386 U CN213938386 U CN 213938386U
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- transformer
- pwm controller
- resistor
- led
- driving circuit
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- 238000004804 winding Methods 0.000 claims abstract description 28
- 239000003990 capacitor Substances 0.000 claims description 13
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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Abstract
The utility model relates to a emitting diode drive technical field discloses a stable emitting diode drive circuit that has of output signal, possesses: a rectifier configured at the front end of the driving circuit, for receiving an externally input voltage signal and rectifying the input voltage signal; the power input end of the PWM controller is connected with the output end of the rectifier; the base electrode of the triode is connected with the signal output end of the PWM controller and is used for receiving the PWM pulse signal output by the PWM controller; one end of a primary winding of the transformer is connected with the output end of the rectifier, and the other end of the primary winding of the transformer is connected with a collector of the triode; and the anode of the LED circuit is connected with one end of the secondary winding of the transformer, and the cathode of the LED circuit is connected with the other end of the secondary winding of the transformer.
Description
Technical Field
The utility model relates to a emitting diode drives technical field, and more specifically says, relates to a have emitting diode drive circuit.
Background
An LED (light emitting diode) driving circuit is divided into two types, a constant-voltage driving and a constant-current driving, according to the type of power supplied to an LED; the constant current switch type LED driving circuit samples current flowing through the LED lamp through the control circuit and outputs a control signal to control the on and off of the switch power tube so as to adjust the output current to be a set value. Because the stability of the control signal output by the LED driving circuit is poor, the service life of the LED is reduced when the LED driving circuit is used for a long time.
Therefore, how to improve the stability of the output control signal of the LED driving circuit becomes a technical problem that needs to be solved by those skilled in the art.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model lies in, to the above-mentioned of prior art because LED drive circuit output control signal's stability is relatively poor, when using for a long time, leads to LED's life to reduce the defect, provides a stable emitting diode drive circuit that has of output signal.
The utility model provides a technical scheme that its technical problem adopted is: a light emitting diode driving circuit is provided with:
a rectifier configured at the front end of the driving circuit, for receiving an externally input voltage signal and rectifying the input voltage signal;
the power input end of the PWM controller is connected with the output end of the rectifier;
the base electrode of the triode is connected with the signal output end of the PWM controller and is used for receiving the PWM pulse signal output by the PWM controller;
one end of a primary winding of the transformer is connected with the output end of the rectifier, and the other end of the primary winding of the transformer is connected with a collector of the triode;
and the anode of the LED circuit is connected with one end of the secondary winding of the transformer, and the cathode of the LED circuit is connected with the other end of the secondary winding of the transformer.
In some embodiments, the transistor is an NPN transistor.
In some embodiments, the PWM controller further comprises a first resistor, one end of the first resistor is connected to the output terminal of the rectifier, and the other end of the first resistor is connected to the power input terminal of the PWM controller.
In some embodiments, the device further comprises a second resistor and a third capacitor connected in parallel,
one end of the second resistor and one end of the third capacitor are connected with one end of the primary winding of the transformer,
and the other ends of the second resistor and the third capacitor are connected with the other end of the primary winding of the transformer through a sixth diode.
In some embodiments, further comprising a seventh diode, an anode of the seventh diode being connected to one end of the secondary winding of the transformer,
and the cathode of the seventh diode is connected with the anode of the LED circuit.
The driving circuit with the light emitting diode of the present invention comprises a rectifier, a PWM controller, a transistor and an LED circuit, wherein the PWM controller is used for outputting a PWM pulse signal, and the transistor is used for receiving the PWM pulse signal output by the PWM controller; the anode of the LED circuit is connected with one end of the secondary winding of the transformer, and the cathode of the LED circuit is connected with the other end of the secondary winding of the transformer. Compared with the prior art, the LED drive circuit has the advantages that the PWM controller outputs the PWM pulse signal to control the conduction and the brightness adjustment of the LED circuit, and the problems that the stability of the output control signal of the existing LED drive circuit is poor, and the service life of an LED is shortened when the LED drive circuit is used for a long time can be effectively solved.
Drawings
The invention will be further explained with reference to the drawings and examples, wherein:
fig. 1 is a circuit diagram of an embodiment of a driving circuit with light emitting diodes according to the present invention.
Detailed Description
In order to clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
As shown in fig. 1, in the first embodiment of the present invention, the LED driving circuit 100 includes a rectifier (corresponding to D101-D104), a PWM controller U101, a transistor VT101, a transformer TR1, and an LED circuit (corresponding to LED 1-LEDn).
The rectifier (corresponding to D101-D104) is disposed at the front end of the driving circuit, and is configured to receive an externally input voltage signal, perform rectification processing and filtering processing on the input voltage signal by the first capacitor C101, and then output the rectified voltage signal to the PWM controller U101 and the transformer TR 1.
The PWM controller U101 has current sensing, output voltage feedback, and outputs PWM pulse signals to control the LED circuits (corresponding to the LEDs 1-LEDn) to turn on/off.
The power supply input end (corresponding to the 5 pins) of the PWM controller U101 is connected with the output end of the rectifier (corresponding to the D101-D104) through the first resistor R101, and the voltage signal input by the rectifier (corresponding to the D101-D104) triggers the PWM controller U101 to work and outputs a PWM pulse signal.
The transistor VT101 has a switching function, and is an NPN transistor.
Specifically, the base of the transistor VT101 is connected to a signal output terminal (corresponding to 4 pins) of the PWM controller U101, and is configured to receive the PWM pulse signal output by the PWM controller U101, so as to control the operating state (i.e., on or off) of the transistor VT 101. The emitter of the transistor VT101 is connected to the common terminal through a fifth resistor R105.
The transformer TR1 has a voltage reduction function.
One end of the primary winding (corresponding to N1) of the transformer TR1 is connected to the output end of the rectifier (corresponding to D101-D104), and the other end of the primary winding (corresponding to N1) of the transformer TR1 is connected to the collector of the transistor VT 101.
The positive pole of the LED circuit (corresponding to LEDs 1-LEDn) is connected to one end of the secondary winding (corresponding to N2) of transformer TR1, and the negative pole of the LED circuit (corresponding to LEDs 1-LEDn) is connected to the other end of the secondary winding (corresponding to N2) of transformer TR 1.
By using the technical scheme, the PWM controller U101 outputs the PWM pulse signal to control the conduction and brightness adjustment of the LED circuit (corresponding to the LEDs 1-LEDn), so that the problems that the stability of the output control signal of the existing LED driving circuit is poor and the service life of the LED is reduced when the LED driving circuit is used for a long time can be effectively solved.
In some embodiments, in order to improve the stability of the PWM controller U101, a first resistor R101 may be disposed in the driving circuit, wherein the resistance of the first resistor R101 is selected to be 2.2M.
Specifically, one end of the first resistor R101 is connected to the output end of the rectifier (corresponding to D101-D104), and the other end of the first resistor R101 is connected to the power input end (corresponding to pin 5) of the PWM controller U101.
In some embodiments, in order to improve the safety of the operation of the transistor VT101, a second resistor R102, a third capacitor C103, and a sixth diode D106 may be disposed in the driving circuit. The resistance of the second resistor R102 is selected to be 100K, and the capacitance of the third capacitor C103 is selected to be 100 PF.
Specifically, the second resistor R102 is connected in parallel with the third capacitor C103.
One ends of the second resistor R102 and the third capacitor C103 are connected to one end of the primary winding (corresponding to N1) of the transformer TR1, and the other ends of the second resistor R102 and the third capacitor C103 are connected to the other end of the primary winding (corresponding to N1) of the transformer TR1 through the sixth diode D106.
Specifically, one end of the second resistor R102 and one end of the third capacitor C103 are connected to the cathode of the sixth diode D106, and the anode of the sixth diode D106 is connected to the other end of the primary winding (corresponding to N1) of the transformer TR 1.
In some embodiments, in order to improve the safety of the operation of the LED circuits (corresponding to the LEDs 1-LEDn), a seventh diode D107 may be provided in the driving circuit, wherein an anode of the seventh diode D107 is connected to one end of the secondary winding (corresponding to N2) of the transformer TR1, and a cathode of the seventh diode D107 is connected to an anode of the LED circuits (corresponding to the LEDs 1-LEDn).
While the embodiments of the present invention have been described with reference to the accompanying drawings, the present invention is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and many modifications may be made by one skilled in the art without departing from the spirit and scope of the present invention as defined in the appended claims.
Claims (5)
1. A light emitting diode driving circuit includes:
a rectifier configured at the front end of the driving circuit, for receiving an externally input voltage signal and rectifying the input voltage signal;
the power input end of the PWM controller is connected with the output end of the rectifier;
the base electrode of the triode is connected with the signal output end of the PWM controller and is used for receiving the PWM pulse signal output by the PWM controller;
one end of a primary winding of the transformer is connected with the output end of the rectifier, and the other end of the primary winding of the transformer is connected with a collector of the triode;
and the anode of the LED circuit is connected with one end of the secondary winding of the transformer, and the cathode of the LED circuit is connected with the other end of the secondary winding of the transformer.
2. The driving circuit with light emitting diodes according to claim 1,
the triode is an NPN type triode.
3. The driving circuit with light emitting diodes according to claim 1,
the PWM controller further comprises a first resistor, one end of the first resistor is connected with the output end of the rectifier, and the other end of the first resistor is connected with the power input end of the PWM controller.
4. The LED driver circuit of claim 3,
also comprises a second resistor and a third capacitor which are connected in parallel,
one end of the second resistor and one end of the third capacitor are connected with one end of the primary winding of the transformer,
and the other ends of the second resistor and the third capacitor are connected with the other end of the primary winding of the transformer through a sixth diode.
5. The LED driver circuit of claim 3,
further comprising a seventh diode, an anode of the seventh diode being connected to one end of the secondary winding of the transformer,
and the cathode of the seventh diode is connected with the anode of the LED circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023323014.7U CN213938386U (en) | 2020-12-31 | 2020-12-31 | Driving circuit with light emitting diode |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023323014.7U CN213938386U (en) | 2020-12-31 | 2020-12-31 | Driving circuit with light emitting diode |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213938386U true CN213938386U (en) | 2021-08-10 |
Family
ID=77156999
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202023323014.7U Expired - Fee Related CN213938386U (en) | 2020-12-31 | 2020-12-31 | Driving circuit with light emitting diode |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213938386U (en) |
-
2020
- 2020-12-31 CN CN202023323014.7U patent/CN213938386U/en not_active Expired - Fee Related
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| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20210810 |