CN213186637U

CN213186637U - Constant voltage driving power supply circuit of LED lamp strip

Info

Publication number: CN213186637U
Application number: CN202022126383.0U
Authority: CN
Inventors: 刘达权
Original assignee: Jiangmen Jianglei Photoelectric Technology Co ltd
Current assignee: Jiangmen Jianglei Photoelectric Technology Co ltd
Priority date: 2020-09-24
Filing date: 2020-09-24
Publication date: 2021-05-11
Anticipated expiration: 2030-09-24

Abstract

The utility model discloses a constant voltage driving power circuit of an LED lamp strip, which comprises a rectification filter module, a power control module, a load filter module, a chip and a chip power supply module; the input end of the rectification filter module is used for connecting commercial power, the output end of the rectification filter module is connected with the power control module, the output end of the power module is connected with the load filter module, and the load filter module is provided with a positive output end and a negative output end which are used for connecting a load; the chip comprises a driving pin, a current sampling pin, a voltage sampling pin, a chip anode and a chip cathode, the rectifier filter module converts alternating current commercial power into direct current to be output to the power control module, the power control module controls the output of constant-voltage current to the load filter module by the driving pin of the chip, and the chip power supply module inputs working voltage for the chip. The utility model has the advantages of stable voltage, no stroboflash of light, current change along with the actual power (length) of the lamp strip, etc.

Description

Constant voltage driving power supply circuit of LED lamp strip

Technical Field

The utility model relates to a circuit specifically discloses a constant voltage drive power supply circuit in LED lamp area.

Background

Because the LED lamp bead of the LED lamp strip has nonlinear volt-ampere characteristics, the small change of voltage can cause the rapid change of current, and further the LED lamp bead is burnt, so that the LED lamp strip can not be directly supplied by AC commercial power and needs an external driving circuit. The drive circuit in current LED lamp area generally adopts rectifier bridge to change alternating current commercial power into the direct current, adopts filter circuit to carry out the filtering to the direct current again, has restrained voltage fluctuation to a certain extent, satisfies the basic user demand in LED lamp area, but voltage fluctuation is still very big, and the light of LED lamp pearl has the high frequency scintillation phenomenon, leads to the life-span of LED lamp pearl to shorten and injure great to the human eye.

SUMMERY OF THE UTILITY MODEL

Therefore, it is necessary to provide a constant voltage driving power circuit of an LED strip, which has small voltage fluctuation, no screen flash of light and simple circuit structure, for solving the problems in the prior art.

In order to solve the prior art problem, the utility model discloses a constant voltage driving power circuit of an LED lamp belt, which comprises a rectification filter module, a power control module, a load filter module, a chip and a chip power supply module; the input end of the rectification filter module is used for connecting commercial power, the output end of the rectification filter module is connected with the power control module, the output end of the power module is connected with the load filter module, and the load filter module is provided with a positive output end and a negative output end which are used for connecting a load; the chip comprises a driving pin, a current sampling pin, a voltage sampling pin, a chip anode and a chip cathode, the rectifier filter module converts alternating current commercial power into direct current to be output to the power control module, the power control module controls the output of constant-voltage current to the load filter module by the driving pin of the chip, and the chip power supply module inputs working voltage for the chip.

The utility model has the advantages that: the utility model discloses a chip control power module provides constant voltage power supply, and rethread load filtering module filters for the lighting module power supply, and LED lamp area all can provide stable voltage and corresponding power's constant current when changing in the power scope (length) that allows. The LED lamp has the advantages of stable voltage, no stroboflash of light, current variable with actual power (length) of the lamp strip and the like.

Drawings

Fig. 1 is a circuit structure diagram of the present invention.

Detailed Description

For further understanding of the features and technical means, as well as the specific objects and functions of the present invention, the present invention will be described in further detail with reference to the accompanying drawings and detailed description.

Refer to fig. 1. The utility model provides an adopt constant voltage drive's LED lamp area circuit, includes the constant voltage drive power supply circuit and the lighting module 4 in LED lamp area.

The constant voltage driving power circuit of the LED lamp strip comprises a rectification filtering module 1, a power control module 2, a load filtering module 3, a chip 5 and a chip power supply module 6. The input end of the rectifying and filtering module 1 is used for connecting with commercial power, the output end of the rectifying and filtering module is connected to the power control module 2, the power control module 2 is connected to the load filtering module 3, and the load filtering module 3 is used for connecting with the lighting module 4. The rectification filter module 1 converts alternating current commercial power into direct current and provides the direct current for the control module 2. The power control module 2 controls the field effect transistor Q to output constant voltage current to the load filtering module 3 through the chip 5, the load filtering module 3 filters the constant voltage current and outputs the filtered constant voltage current to the lighting module 4, and the chip power supply module 6 inputs working voltage for the chip 5.

The chip 5 comprises a driving pin DRV, a current sampling pin CS, a voltage sampling pin FB, a chip anode VCC and a chip cathode GND. The driving pin DRV is used for driving the external field effect transistor Q, the current sampling pin CS is used for detecting whether the output current of the power module 2 exceeds a preset value or not, the chip anode VCC and the chip cathode GND are used for supplying power to the chip, and the voltage sampling pin FB is used for feeding back the output voltage of the power module 2 and is used as a control reference for outputting a driving signal by the driving pin DRV.

The rectifying and filtering module 1 comprises a rectifying bridge BR, a first capacitor C1 and a first resistor R1. A fuse F is connected to a live wire input end AC/L of the rectifier bridge BR, and a piezoresistor M is connected between a zero live wire input end AC/N, AC/L of the rectifier bridge BR. The piezoresistor M can prevent the rectifier bridge BR from being damaged by the abnormal fluctuation of the mains supply. The first capacitor C1 and the first resistor R1 which is connected with the first capacitor C1 in parallel are connected between the positive and negative output ends of the rectifier bridge BR.

The power control module 2 comprises a field effect transistor Q and a transformer L. The drain of the field effect transistor Q is connected to the positive output terminal of the rectifying and filtering module 1, and the gate thereof is connected to the chip driving pin DRV through a second resistor R2, and the second resistor R2 is further connected in parallel with a first diode D1 in a positive connection. The first diode D2 prevents the power output from DRV from damaging the fet Q. A third resistor R3 is connected between the source and the gate of the field effect transistor Q. And the source electrode of the field effect transistor Q is connected to the primary side anode of the transformer L and the chip cathode GND through a fourth resistor R4. The chip current sampling end CS is connected with the chip cathode GND through the fourth resistor R4. The chip cathode GND is connected to the cathode output end of the rectifying and filtering module 1 through the second diode D2 in reverse connection. The reverse-connected second diode D2 prevents the reverse current generated by the magnetic field of the electronic component from striking the chip 5. The fourth resistor R4 is used as a current sampling resistor of the chip current sampling terminal CS, and the magnitude of the fourth resistor R4 is adjusted to set a constant current point (maximum value) of the output current of the power control module 2. The negative electrode of the primary side of the transformer L is connected to a voltage sampling end FB of the chip 5 through a fifth resistor R5, the voltage sampling end FB of the chip is connected to the negative electrode GND of the chip through a sixth resistor R6, and the sixth resistor R6 is also connected in parallel with a second capacitor C2.

The load filtering module 3 comprises a third capacitor C3 and a seventh resistor R7 connected in parallel. After the system is powered off, the seventh resistor R7 can discharge to the third capacitor C3, and afterglow of the LED lamp bead is eliminated. The anode of the third capacitor C3 is connected to the primary side cathode of the transformer L, and the cathode thereof is connected to the cathode output end of the rectifier filter module 1. The load filter module 3 further has positive and

negative output terminals

31 and 32 respectively connected to the positive and negative electrodes of the third capacitor C3.

The lighting module 4 may include a string of lights 40 formed by connecting a plurality of LED bulbs 41 in series, or may include a plurality of strings of lights connected in parallel and having the same operating voltage. The positive and negative electrodes of the lamp string 40 are respectively electrically connected with the positive and

negative output ends

31 and 32 of the load filter module 3.

The chip power supply module 6 includes a first power supply module 61 and a second power supply module 62. The first power supply module 61 is connected to a chip anode VCC through a third diode D3 and an eighth resistor R8 connected in series with the third diode D3, which are connected in series with the rear end of a fuse F at the live wire input end of the rectifier bridge BR, and the chip anode VCC is connected to a chip cathode GND through a fourth capacitor C4 and a ninth resistor R9 connected in parallel with the fourth capacitor C4. The second power supply module 62 is connected to the chip anode VCC through a tenth resistor R10 and a forward fourth diode D4 connected in series with the tenth resistor R10 by the secondary anode of the transformer L, and the secondary cathode of the transformer L is connected to the chip cathode GND. The first power supply module 61 is used for supplying power at the moment when the chip 5 is started, and the second power supply module 62 supplies power after the chip 5 is started. Because the chip 5 is supplied with power by the second power supply module 62 from the secondary side of the transformer when working normally, the influence of the load on the power supply voltage is small, the power supply of the chip is more stable, and the power loss of the chip is prevented.

The utility model discloses a field effect transistor and the transformer of chip control power module provide constant voltage power supply, and rethread load filtering module filters for the lighting module power supply, and LED lamp area all can provide stable voltage and the constant current of corresponding power when changing in the power range (length) that allows. The LED lamp has the advantages of stable voltage, no stroboflash of light, current variable with actual power (length) of the lamp strip and the like.

The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

1. The utility model provides a constant voltage drive power supply circuit in LED lamp area which characterized in that: the power supply circuit comprises a rectification filtering module, a power control module, a load filtering module, a chip and a chip power supply module; the input end of the rectification filter module is used for connecting commercial power, the output end of the rectification filter module is connected with the power control module, the output end of the power module is connected with the load filter module, and the load filter module is provided with a positive output end and a negative output end which are used for connecting a load; the chip comprises a driving pin, a current sampling pin, a voltage sampling pin, a chip anode and a chip cathode, the rectifier filter module converts alternating current commercial power into direct current to be output to the power control module, the power control module controls the output of constant-voltage current to the load filter module by the driving pin of the chip, and the chip power supply module inputs working voltage for the chip.

2. A constant voltage driving power supply circuit for an LED strip as claimed in claim 1, wherein: the rectification filtering module comprises a rectification bridge, and a first capacitor and a first resistor connected with the first capacitor in parallel are connected between the positive and negative output ends of the rectification bridge.

3. A constant voltage driving power supply circuit for an LED strip as claimed in claim 2, wherein: and a piezoresistor is connected between the zero line input end and the live line input end of the rectifier bridge, and a fuse is connected to the live line input end of the rectifier bridge.

4. A constant voltage driving power supply circuit for an LED strip as claimed in claim 1, wherein: the power control module comprises a field effect transistor and a transformer; the drain electrode of the field effect transistor is connected to the positive electrode output end of the rectifying and filtering module, the grid electrode of the field effect transistor is connected to the chip driving pin through a second resistor, a third resistor is connected between the source electrode of the field effect transistor and the grid electrode of the field effect transistor, and the source electrode of the field effect transistor is connected to the primary side positive electrode of the transformer and the negative electrode of the chip through a fourth resistor; the chip current sampling end is connected with the negative electrode of the chip through the fourth resistor; the negative electrode of the primary side of the transformer is connected to the voltage sampling end of the chip through a fifth resistor, the voltage sampling end of the chip is connected to the negative electrode of the chip through a sixth resistor, and the sixth resistor is connected with a second capacitor in parallel.

5. A constant voltage driving power supply circuit of an LED strip as claimed in claim 4, wherein: the second resistor is also connected with a first diode in parallel.

6. A constant voltage driving power supply circuit of an LED strip as claimed in claim 4, wherein: and the negative electrode of the chip is connected to the negative electrode output end of the rectifying and filtering module through a second diode which is reversely connected.

7. A constant voltage driving power supply circuit of an LED strip as claimed in claim 4, wherein: the load filtering module comprises a third capacitor and a seventh resistor connected in parallel with the third capacitor; the positive electrode of the third capacitor is connected to the primary negative electrode of the transformer, the negative electrode of the third capacitor is connected to the negative electrode output end of the rectification filter module, and the load filter module is provided with positive and negative electrode output ends which are respectively connected with the positive and negative electrodes of the third capacitor.

8. A constant voltage driving power supply circuit of an LED strip as claimed in claim 4, wherein: the chip power supply module comprises a first power supply module and a second power supply module; the first power supply module is connected to the anode of the chip through a third diode connected to the rear end of the fuse and an eighth resistor connected in series with the third diode, and the anode of the chip is connected to the cathode of the chip through a third capacitor and a ninth resistor connected in parallel with the third capacitor; and the secondary side cathode of the transformer is connected to the cathode of the chip.