CN207854232U - A kind of constant current constant voltage LED drive circuit - Google Patents
A kind of constant current constant voltage LED drive circuit Download PDFInfo
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- CN207854232U CN207854232U CN201820026667.2U CN201820026667U CN207854232U CN 207854232 U CN207854232 U CN 207854232U CN 201820026667 U CN201820026667 U CN 201820026667U CN 207854232 U CN207854232 U CN 207854232U
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Abstract
The utility model is related to the technical fields of Switching Power Supply, disclose a kind of constant current constant voltage LED drive circuit, including input rectifying filter module, the input rectifying filter module is connected with the primary coil of transformer, it is connected again with power switch tube, the power switch tube is connected by current sampling module with drive control IC, the drive control IC is also connected with power switch tube, the ancillary coil of the transformer passes through voltage sample module, power supply module is connected with drive control IC, the secondary coil of the transformer passes through output rectification filter module and LED load, power supply coil is connected with light modulation toning module, the light modulation toning module is also connected with output rectification filter module, the input rectifying filter module is also connected by starting module with drive control IC.The utility model uses primary side feedback technology, reduces optocoupler and voltage stabilizing chip TL431, saves the space on circuit board, reduces cost, improve the reliability of driving circuit.
Description
Technical field
The utility model is related to the technical fields of Switching Power Supply, and in particular to a kind of constant current constant voltage LED drive circuit.
Background technology
The features such as LED illumination is because of its energy-saving and environmental protection and long lifespan becomes the development trend of the following illumination.LED light is unlike general
Logical incandescent lamp bulb, can be directly connected to the electric main of 220V, it needs low-voltage direct to drive, it is therefore necessary to design complexity
Power converting circuit.The service life of LED and driving power have prodigious relationship, driving power power supply instability to cause LED to shine and imitate
Rate reduces, and the lost of life, color changes, or even burns.In addition, transfer efficiency, constant current/constant voltage precision, power source life, electricity
The requirements such as magnetic compatibility are also the factor that designs LED drive power and must take into consideration.
Traditional LED drive power generally only has the simple function of constant current or constant pressure, using secondary side feedback mode, utilizes
Optocoupler combination TL431 parallel voltage-stabilizing integrated circuits complete constant current or constant pressure output, and the constituent element of entire circuit is numerous, knot
Structure is complicated, and finished-product volume is larger, so that its cost is high.
Utility model content
The utility model provides a kind of constant current constant voltage LED drive circuit, and the structure for solving existing LED drive power is multiple
The problems such as miscellaneous, finished-product volume is larger, and cost remains high.
The utility model can be achieved through the following technical solutions：
A kind of constant current constant voltage LED drive circuit, including input rectifying filter module, the input rectifying filter module and change
The primary coil of depressor is connected, then is connected with power switch tube, and the power switch tube is controlled by current sampling module and driving
IC processed is connected, and the drive control IC is also connected with power switch tube, and the ancillary coil of the transformer passes through voltage sample mould
Block, power supply module are connected with drive control IC, and the secondary coil of the transformer is negative by output rectification filter module and LED
It carries, power supply coil is connected with light modulation toning module, and the light modulation toning module is also connected with output rectification filter module, described defeated
Enter rectification filtering module to be also connected with drive control IC by starting module.
Further, the drive control IC uses the integrated chip of model OB2532, the electric current of the drive control IC
Detection input is connected by current sampling module with the source electrode of power switch tube, gate leve drive output and power switch tube
Grid is connected, and Voltage Feedback input terminal is connected by voltage sample module with the ancillary coil of transformer, and power input passes through
Power supply module is also connected with the ancillary coil of transformer, and the drain electrode of the power switch tube is connected with the primary coil of transformer.
Further, the voltage sample module includes resistance R11 in parallel with capacitance C3, then is connected with resistance R12；Electric current is adopted
Egf block includes four resistance values identical resistance R5, R6, R7, R8 in parallel, then is connected with resistance R4.
Further, the input rectifying filter module, output rectification filter module include rectification circuit and filter circuit,
The rectification circuit includes rectifier bridge or multiple diodes, and the filter circuit includes capacitance.
The utility model is beneficial to be had technical effect that：
The primary side feedback technology of drive control IC using model OB2532 itself, passes through current sampling module, voltage
Sampling module detect respectively the current status of the source electrode of power switch tube, transformer ancillary coil voltage status, feed back to
Drive control IC carries out electric current, voltage is adjusted, and meets the constant current constant voltage requirement of LED load, subtracts than traditional secondary side feedback technology
Lacked optocoupler and voltage stabilizing chip TL431, saved the space on circuit board, reduce cost and improve driving circuit can
By property.
Description of the drawings
Fig. 1 is that the circuit of the utility model connects block diagram；
Fig. 2 is the physical circuit connection figure of the utility model；
Fig. 3 is the power supply circuit connection figure of the control circuit of the utility model；
Fig. 4 is the control circuit connection figure of the light modulation toning of the utility model.
Specific implementation mode
With reference to the accompanying drawings and embodiments, specific embodiment of the present utility model is described in detail.
With reference to attached drawing 1, the utility model provides a kind of constant current constant voltage LED drive circuit, including input rectifying filters mould
Block, which is connected with the primary coil of transformer, then is connected with power switch tube, and the power switch tube is logical
Overcurrent sampling module is connected with drive control IC, and drive control IC is also connected with power switch tube, the auxiliary of the transformer
Coil is connected by voltage sample module, power supply module with drive control IC, and the secondary coil of the transformer is by exporting rectification
Filter module and LED load, power supply coil with light modulation toning module be connected, the light modulation toning module also with output rectification filter mould
Block is connected, which is also connected by starting module with drive control IC.
With reference to attached drawing 2, drive control IC uses the integrated chip of model OB2532, current sense input to pass through
Current sampling module is connected with the source electrode of power switch tube, and gate leve drive output is connected with the grid of power switch tube, voltage
Feedback input end is connected by voltage sample module with the ancillary coil of transformer, power input by power supply module also with change
The ancillary coil of depressor is connected, and the drain electrode of the power switch tube is connected with the primary coil of transformer.
With reference to attached drawing 2, which includes the resistance R12 being connected with the ancillary coil of transformer, resistance R12 and simultaneously
The resistance R11 of connection, capacitance C3 series connection, are connected to the Voltage Feedback input terminal of drive control IC；Current sampling module includes simultaneously
Four resistance values identical resistance R5, R6, R7, R8 of connection, one end connect the source electrode of power switch tube, and the other end connects resistance
R4, then access the current sense input of drive control IC；Power supply module includes concatenated diode D5 and resistance R13, and
Capacitance C2, one end connect the ancillary coil of depressor, and the other end accesses the power input of drive control IC.
With reference to attached drawing 2, the input rectifying filter module, output rectification filter module include rectification circuit and filtered electrical
Road, rectification circuit realize that filter circuit is realized by capacitance using rectifier bridge or multiple diodes.
With reference to attached drawing 3,4, light modulation toning module includes the control circuit that light modulation is mixed colours and the power supply circuit powered for it.
The course of work of the utility model is as follows：Electric main is converted into direct current by input rectifying filter module, is connect
The primary coil for entering transformer gives mono- enabling signal of drive control IC after the starting module decompression by resistance R1, R2 composition,
So that drive control IC is started to work, the voltage change of the auxiliary winding of transformer is sampled using voltage acquisition module to detect load
The information of variation, then by the switching frequency of drive control IC builtin voltage control errors PWM, realize burning voltage output, profit
Compare with the curent change of electric current sampling circuit samples power switch tube, then by 1 internal errors of drive control IC, controls PWM
Switching frequency, realize constant current output, then, by output rectification filter module output meet LED light requirement Current Voltage,
It is powered, and combines the 2.4G wireless module output pwm signals control power switch tube output of model MUS2.4G
Size of current realizes light modulation toning output, to realize power supply and the light modulation toning control to LED load.
The utility model passes through current sample using the primary side feedback technology of the drive control IC of model OB2532 itself
Module, voltage sample module detect respectively the current status of the source electrode of power switch tube, transformer ancillary coil voltage shape
State feeds back to drive control IC and carries out electric current, voltage adjusting, meets the constant current constant voltage requirement of LED load, more anti-than traditional secondary side
Feedback technology reduces optocoupler and voltage stabilizing chip TL431, saves the space on circuit board, reduces cost and improves driving
The reliability of circuit.
Although the foregoing describe specific embodiment of the present utility model, it will be appreciated by those of skill in the art that
These are merely examples, under the premise of without departing substantially from the principles of the present invention and essence, can be done to these embodiments
Go out various changes or modifications, therefore, the scope of protection of the utility model is defined by the appended claims.
Claims (4)
1. a kind of constant current constant voltage LED drive circuit, it is characterised in that：Including input rectifying filter module, the input rectifying filter
Wave module is connected with the primary coil of transformer, then is connected with power switch tube, and the power switch tube passes through current sample mould
Block is connected with drive control IC, and the drive control IC is also connected with power switch tube, and the ancillary coil of the transformer passes through
Voltage sample module, power supply module are connected with drive control IC, and the secondary coil of the transformer passes through output rectification filter mould
Block and LED load, power supply coil are connected with light modulation toning module, the light modulation mix colours module also with output rectification filter module phase
Even, the input rectifying filter module is also connected by starting module with drive control IC.
2. constant current constant voltage LED drive circuit according to claim 1, it is characterised in that：The drive control IC uses type
Number integrated chip for being OB2532, the current sense input of the drive control IC passes through current sampling module and power switch
The source electrode of pipe is connected, and gate leve drive output is connected with the grid of power switch tube, and Voltage Feedback input terminal passes through voltage sample
Module is connected with the ancillary coil of transformer, and power input is also connected with the ancillary coil of transformer by power supply module, institute
The drain electrode for stating power switch tube is connected with the primary coil of transformer.
3. constant current constant voltage LED drive circuit according to claim 2, it is characterised in that：The voltage sample module includes
Resistance R11 is in parallel with capacitance C3, then connects with resistance R12；Current sampling module include the identical resistance R5, R6 of four resistance values,
R7, R8 are in parallel, then connect with resistance R4.
4. constant current constant voltage LED drive circuit according to claim 1, it is characterised in that：The input rectifying filter module,
Output rectification filter module includes rectification circuit and filter circuit, and the rectification circuit includes rectifier bridge or multiple two poles
Pipe, the filter circuit includes capacitance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820026667.2U CN207854232U (en) | 2018-01-08 | 2018-01-08 | A kind of constant current constant voltage LED drive circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820026667.2U CN207854232U (en) | 2018-01-08 | 2018-01-08 | A kind of constant current constant voltage LED drive circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207854232U true CN207854232U (en) | 2018-09-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820026667.2U Active CN207854232U (en) | 2018-01-08 | 2018-01-08 | A kind of constant current constant voltage LED drive circuit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111900883A (en) * | 2019-05-06 | 2020-11-06 | 江苏和网源电气有限公司 | Portable novel inverter |
| CN114698192A (en) * | 2022-05-07 | 2022-07-01 | 深圳市涌固精密治具有限公司 | Self-adaptive current constant-current source and control method |
-
2018
- 2018-01-08 CN CN201820026667.2U patent/CN207854232U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111900883A (en) * | 2019-05-06 | 2020-11-06 | 江苏和网源电气有限公司 | Portable novel inverter |
| CN114698192A (en) * | 2022-05-07 | 2022-07-01 | 深圳市涌固精密治具有限公司 | Self-adaptive current constant-current source and control method |
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