CN206181462U - LED constant current driving circuit - Google Patents
LED constant current driving circuit Download PDFInfo
- Publication number
- CN206181462U CN206181462U CN201621284595.9U CN201621284595U CN206181462U CN 206181462 U CN206181462 U CN 206181462U CN 201621284595 U CN201621284595 U CN 201621284595U CN 206181462 U CN206181462 U CN 206181462U
- Authority
- CN
- China
- Prior art keywords
- branch road
- resistance
- constant current
- parallel
- led
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Landscapes
- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The utility model discloses a LED constant current driving circuit, include the rectifier bridge even with municipality ferroelectric phase, the output of rectifier bridge is connected with the first branch road that is formed by second resistance and the 3rd series resistance, and first parallelly connected on the road has by the fourth resistance second branch road that the series connection formed with the switch tube, and wherein the control end of switch tube is connected to between second resistance and the third resistance through a zener diode, the second props up to connect in parallel on the road has the third branch road of taking energy -storage capacitor, the third props up to connect in parallel on the road to have and allies oneself with the fourth branch road that forms by LED series connection group and constant current diode string, be equipped with field effect transistor between third branch road and the second branch road, field effect transistor's grid is connected to between fourth resistance and the switch tube. The utility model discloses can can effectively obtain the constant current output under the low -voltage state to electric main modulate for the LED drive, and need not the vary voltage, the volume can be done lessly relatively.
Description
Technical field
The utility model is related to a kind of constant current driver circuit for LED, belongs to technical field of LED illumination.
Background technology
The driving of LED is usually constant current driving and constant pressure drives two kinds.In view of the C-V characteristic of LED, constant current is selected to drive
Dynamic method generally to be preferred over constant pressure driving.How by the electric main of 220V be converted into can with constant current output source be this area always
In a new problem of Improvement.And need to consider that the power of most of civil LED light fixtures is relatively low, so selecting to drive
Generally all need possess transformation function during dynamic power supply, therefore the volume of driving power supply is generally large.
Utility model content
The purpose of this utility model is, there is provided a kind of constant current driver circuit for LED.It can be adjusted to electric main
System, can effectively obtain the constant current output under low-pressure state, and for LED drivings, and without the need for transformation, volume can be made relatively
It is little.
The technical solution of the utility model：A kind of constant current driver circuit for LED, is characterized in：Including whole with what city was electrically connected
Stream bridge, the output end of rectifier bridge is connected with the tie point being in series by second resistance and 3rd resistor, in tie point simultaneously
The second branch road being in series by the 4th resistance and switching tube is associated with, the wherein control end of switching tube passes through the first Zener diode
It is connected between second resistance and 3rd resistor；The 3rd branch road with storage capacitor is parallel with second branch road；3rd
The 4th branch road being in series by LED strip joint group and current regulator diode is parallel with road；3rd branch road and the second branch road it
Between be provided with FET, the grid of FET is connected between the 4th resistance and switching tube.
In above-mentioned constant current driver circuit for LED, the 3rd branch road includes the 5th resistance with energy storage capacitor in series, and with
Storage capacitor the 6th resistance in parallel.For adjusting the operating voltage at storage capacitor two ends.
In aforesaid constant current driver circuit for LED, it is parallel with the storage capacitor by the 7th resistance, discharge switch and the 4th
The branch road of Diode series.When the branch road can be used for circuit maintenance, storage capacitor can discharge completely.
In aforesaid constant current driver circuit for LED, the second Zener diode is parallel with the switching tube；On storage capacitor simultaneously
It is associated with the 3rd Zener diode.For realizing the overvoltage protection of switching tube and storage capacitor.
In aforesaid constant current driver circuit for LED, between the rectifier bridge and civil power incoming end fusing resistor is provided with.
In aforesaid constant current driver circuit for LED, on the 4th branch road the 8th resistance is in series with.
Compared with prior art, the utility model carries out the voltage inspection between resistance using two resistance of tie point
Survey, the first Zener diode of the second branch road can be turned on when the overtension between resistance, and then turn off FET, make storage
Energy electric capacity and LED strip joint group power-off, equivalent to the high-pressure section for having chopped civil power input off, and in low pressure, then can make energy storage electricity
Hold and LED strip joint group is powered, can realize that low pressure constant current drives to LED strip joint group.The utility model circuit is simple, it is real to be easy to
It is existing, and potential device is eliminated, volume be can be made smaller.
Description of the drawings
Fig. 1 is structural representation of the present utility model.
Specific embodiment
The utility model is further described with reference to the accompanying drawings and examples, but is not intended as to the utility model
The foundation of restriction.
Embodiment.A kind of constant current driver circuit for LED, as shown in Figure 1：Including the rectifier bridge T1 being electrically connected with city, rectifier bridge
The output end of T1 is connected with the tie point being in series by second resistance R2 and 3rd resistor R3, be parallel with tie point by
The second branch road that 4th resistance R4 and switching tube Q1 are in series, the wherein control end of switching tube Q1 pass through the first Zener diode
D1 is connected between second resistance R2 and 3rd resistor R3；The 3rd branch road with storage capacitor C is parallel with second branch road；
The 4th branch road being in series by LED strip joint group and current regulator diode CRD is parallel with 3rd branch road；3rd branch road and
FET Q2 is provided between two branch roads, the grid of FET Q2 is connected between the 4th resistance R4 and switching tube Q1.It is described
3rd branch road includes the 5th resistance R5 connected with storage capacitor C, and the sixth resistance R6 in parallel with storage capacitor C.The storage
The branch road being in series by the 7th resistance R7, discharge switch K and the 4th diode D4 can be parallel with electric capacity C.The switching tube
The second Zener diode D2 is parallel with Q1；The 3rd Zener diode D3 is parallel with storage capacitor C.The rectifier bridge T1 and city
It is electrically accessed between end and is provided with fusing resistor R1.The 8th resistance R8 is in series with 4th branch road.
Operation principle of the present utility model：Civil power is converted into into DC pulse output, Ran Houli first with rectifier bridge T1
Partial pressure is carried out with resistance R2 and R3, after the voltage of DC pulse output begins to ramp up from 0, reverse Zener diode D1 is caused
Switching tube Q1 is turned off, FET Q2 conductings, and now electric capacity C can be charged, when the voltage of DC pulse output rises
To a certain extent, Zener diode D1 reverse-conductings, switching tube Q1 conductings, FET Q2 shut-offs, equivalent to having chopped high pressure off
Part, electric capacity C continues to LED electric discharges, until the voltage of DC pulse output is to next cycle, in the discharge process of electric capacity C
In, under the collective effect of current regulator diode and resistance R8, LED obtains constant current driving.
Claims (6)
1. a kind of constant current driver circuit for LED, it is characterised in that：Including the rectifier bridge being electrically connected with city（T1）, rectifier bridge（T1）'s
Output end is connected with by second resistance（R2）And 3rd resistor（R3）The tie point being in series, be parallel with tie point by
4th resistance（R4）And switching tube（Q1）The second branch road being in series, wherein switching tube（Q1）Control end pass through the first voltage stabilizing
Diode（D1）It is connected to second resistance（R2）And 3rd resistor（R3）Between；Band storage capacitor is parallel with second branch road
（C）The 3rd branch road；It is parallel with by LED strip joint group and current regulator diode on 3rd branch road（CRD）The 4th branch road being in series；
FET is provided between 3rd branch road and the second branch road（Q2）, FET（Q2）Grid be connected to the 4th resistance
（R4）And switching tube（Q1）Between.
2. constant current driver circuit for LED according to claim 1, it is characterised in that：3rd branch road includes and energy storage electricity
Hold（C）5th resistance of series connection（R5）, and and storage capacitor（C）6th resistance in parallel（R6）.
3. constant current driver circuit for LED according to claim 2, it is characterised in that：The storage capacitor（C）On be parallel with by
7th resistance（R7）, discharge switch（K）With the 4th diode（D4）The branch road being in series.
4. constant current driver circuit for LED according to claim 2, it is characterised in that：The switching tube（Q1）On be parallel with
Two Zener diodes（D2）；Storage capacitor（C）On be parallel with the 3rd Zener diode（D3）.
5. constant current driver circuit for LED according to claim 1, it is characterised in that：The rectifier bridge（T1）It is electrically accessed with city
Fusing resistor is provided between end（R1）.
6. constant current driver circuit for LED according to claim 1, it is characterised in that：The 8th is in series with 4th branch road
Resistance（R8）.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621284595.9U CN206181462U (en) | 2016-11-28 | 2016-11-28 | LED constant current driving circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621284595.9U CN206181462U (en) | 2016-11-28 | 2016-11-28 | LED constant current driving circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206181462U true CN206181462U (en) | 2017-05-17 |
Family
ID=60242116
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621284595.9U Expired - Fee Related CN206181462U (en) | 2016-11-28 | 2016-11-28 | LED constant current driving circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206181462U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106535405A (en) * | 2016-11-28 | 2017-03-22 | 湖州明日照明科技有限公司 | LED constant-current drive circuit |
-
2016
- 2016-11-28 CN CN201621284595.9U patent/CN206181462U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106535405A (en) * | 2016-11-28 | 2017-03-22 | 湖州明日照明科技有限公司 | LED constant-current drive circuit |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN204131399U (en) | A kind of booster circuit | |
| CN203814013U (en) | LED driving circuit adopting single-end zero crossing detection | |
| CN103945616B (en) | A kind of light fixture and LED drive device thereof | |
| CN105338690A (en) | LED dimming power source | |
| CN102833902B (en) | Booster type constant current driver circuit for LED | |
| CN103152928A (en) | Load overvoltage protection circuit and control method thereof | |
| CN105680693B (en) | A kind of bi-directional DC-DC device with stepping functions | |
| CN206181462U (en) | LED constant current driving circuit | |
| CN204392656U (en) | LED drive circuit and LED switch driving power | |
| CN204258608U (en) | Ripple suppression circuit and circuit system comprising same | |
| CN103166443A (en) | Soft start control circuit and constant flow source drive circuit | |
| CN108449845A (en) | A kind of LED light driving device with automatic light sensation function | |
| TWM496315U (en) | AC driver devices of LEDs | |
| CN108012380B (en) | Linear wide-voltage constant-current constant-power circuit and LED lamp with same | |
| CN103731049B (en) | Current zero-crossing point detects circuit and method, drive circuit and method, Switching Power Supply | |
| CN205693959U (en) | The constant current boost circuit of a kind of DC DC and flash lamp circuit | |
| CN206024165U (en) | A kind of LED drive circuit and LED lamp | |
| CN205792500U (en) | A kind of inductive load voltage PWM magnetic release circuit | |
| CN108055731A (en) | Classroom blackboard LED light strip driving circuit with protective effect | |
| CN203934041U (en) | A kind of light fixture and LED drive unit thereof | |
| CN204131483U (en) | Low-loss hyper tape isolated drive circuit | |
| CN204046881U (en) | A kind of LED dimming power source | |
| CN203827587U (en) | Large power LED driving circuit | |
| CN203151827U (en) | Ultra-long-life large-current light emitting diode (LED) drive power circuit | |
| CN203289700U (en) | Novel drive power supply with light-emitting diode |
Legal Events
| 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: 20170517 Termination date: 20171128 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |