CN206977752U - A kind of adjustable constant current driver circuit for LED of output current - Google Patents
A kind of adjustable constant current driver circuit for LED of output current Download PDFInfo
- Publication number
- CN206977752U CN206977752U CN201720783667.2U CN201720783667U CN206977752U CN 206977752 U CN206977752 U CN 206977752U CN 201720783667 U CN201720783667 U CN 201720783667U CN 206977752 U CN206977752 U CN 206977752U
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- led
- constant
- output current
- current
- driver circuit
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Abstract
The utility model provides a kind of adjustable constant current driver circuit for LED of output current, including direct-current input power supplying, power switch, anti-reverse diode, shunt capacitance, sampling resistor, NMOS tube, constant-flow driver and LED load.The utility model only needs less circuit element, can realize that output current is adjustable, while also ensure that the constant current accuracy of output current, and its circuit structure is simple, and cost is relatively low, can be widely applied to the lighting apparatus such as LED flashlight, LED desk lamp, LED mine lamp.
Description
Technical field：
A kind of electronic circuit is the utility model is related to, more particularly to a kind of adjustable constant current driver circuit for LED of output current.
Background technology：
At present, LED constant current driving is wanted to realize that output current is adjustable, mostly by single-chip microcomputer by constant current and special detection
The feedback current of circuit is compared, so as to adjust the pwm pulse signal dutycycle of output to realize.Its electric circuit electronics technical element phase
To more, structure is more complicated, and cost is also higher.
Utility model content：
(1) technical problem solved
In order to solve the above problems, the utility model proposes a kind of adjustable constant current driver circuit for LED of output current.
(2) technical scheme
A kind of adjustable constant current driver circuit for LED of output current, including direct-current input power supplying, power switch, anti-reverse two
Pole pipe, shunt capacitance, sampling resistor, NMOS tube, constant-flow driver and LED load；The constant-flow driver VDD pin respectively with institute
State anti-reverse diode negative terminal to connect with described shunt capacitance one end, the constant-flow driver DRV pin and the NMOS tube grid
It is connected, the constant-flow driver CS pin are connected with the NMOS tube source electrode and described sampling resistor one end respectively, and the constant current is driven
Dynamic device GND pin ground connection；
The NMOS tube drain electrode connects the LED load negative terminal, and the direct-current input power supplying anode is opened by the power supply
Pass connects the anti-reverse diode anode and the LED load anode, the direct-current input power supplying negative terminal, the bypass respectively
The electric capacity other end and the sampling resistor other end are all grounded.
Further, the direct-current input power supplying is 2.7~5.5V.
Further, the sampling resistor is metalfilmresistor.
Further, the constant-flow driver selects HX7136.
(3) beneficial effect
The utility model provides a kind of adjustable constant current driver circuit for LED of output current, only needs less circuit element,
It can realize that output current is adjustable, while also ensure that the constant current accuracy of output current, its circuit structure is simple, and cost is relatively low,
It can be widely applied to the lighting apparatus such as LED flashlight, LED desk lamp, LED mine lamp.
Brief description of the drawings：
Fig. 1 is the adjustable constant current driver circuit for LED schematic diagram of a kind of output current involved by the utility model.
Embodiment：
The embodiment involved by the utility model is described in further details below in conjunction with the accompanying drawings.
As shown in Figure 1：A kind of adjustable constant current driver circuit for LED of output current, includes direct-current input power supplying E, power switch
K, anti-reverse diode D1, shunt capacitance C, sampling resistor R, NMOS tube Q, constant-flow driver U, LED load D1 and D2.It is wherein straight
It is 2.7~5.5V to flow input power E, and single-unit 1000mAh lithium batteries can be used.Constant-flow driver U selects HX7136, is a kind of low
The LED linear decompression constant-current driven chip of pressure difference, negative-feedback is used as by sampled output current to form whole work loop
Steady operation.HX7136 CS pin are current settings pin, and DRV pin are that outside NMOS drives pin, and VDD pin are chip power pin, GND
Pin is chip ground pin.
HX7136 VDD pin are connected with anti-reverse diode D1 negative terminals and shunt capacitance C one end respectively, anti-reverse diode
D1 mainly prevents battery reversal connection, and DRV pin are connected with NMOS tube Q grid, the CS pin source electrode and sampling resistor with NMOS tube Q respectively
R one end connects, GND pin ground connection；NMOS tube Q drain electrode connection LED load negative terminal, direct-current input power supplying E anodes are opened by power supply
Close K and connect anti-reverse diode D1 anodes and LED load anode, direct-current input power supplying E negative terminals, the shunt capacitance C other ends respectively
All it is grounded with the sampling resistor R other ends.Changed using resistance R resistances, HX7136 CS pin output currents are adjustable.It is defeated in order to ensure
Go out the constant current accuracy of electric current, sampling resistor R uses metalfilmresistor.
The utility model provides a kind of adjustable constant current driver circuit for LED of output current, only needs less circuit element,
It can realize that output current is adjustable, while also ensure that the constant current accuracy of output current, its circuit structure is simple, and cost is relatively low,
It can be widely applied to the lighting apparatus such as LED flashlight, LED desk lamp, LED mine lamp.
Embodiment described above is only that preferred embodiment of the present utility model is described, not to this practicality
New spirit and scope are defined.On the premise of the utility model design conception is not departed from, ordinary people in the field couple
The all variations and modifications that the technical solution of the utility model is made, the scope of protection of the utility model, this reality all should be dropped into
With new claimed technology contents, all record in detail in the claims.
Claims (4)
- A kind of 1. adjustable constant current driver circuit for LED of output current, it is characterised in that：Including direct-current input power supplying, power switch, Anti-reverse diode, shunt capacitance, sampling resistor, NMOS tube, constant-flow driver and LED load；The constant-flow driver VDD pin are connected with the anti-reverse diode negative terminal and described shunt capacitance one end respectively, described Constant-flow driver DRV pin are connected with the NMOS tube grid, the constant-flow driver CS pin respectively with the NMOS tube source electrode and Sampling resistor one end connection, the constant-flow driver GND pin ground connection；The NMOS tube drain electrode connects the LED load negative terminal, and the direct-current input power supplying anode passes through the power switch point The anti-reverse diode anode and the LED load anode, the direct-current input power supplying negative terminal, the shunt capacitance are not connected The other end and the sampling resistor other end are all grounded.
- A kind of 2. adjustable constant current driver circuit for LED of output current according to claim 1, it is characterised in that：It is described straight Stream input power is 2.7~5.5V.
- A kind of 3. adjustable constant current driver circuit for LED of output current according to claim 1, it is characterised in that：It is described to adopt Sample resistance is metalfilmresistor.
- A kind of 4. adjustable constant current driver circuit for LED of output current according to claim 1, it is characterised in that：The perseverance Stream driver selects HX7136.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720783667.2U CN206977752U (en) | 2017-06-30 | 2017-06-30 | A kind of adjustable constant current driver circuit for LED of output current |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720783667.2U CN206977752U (en) | 2017-06-30 | 2017-06-30 | A kind of adjustable constant current driver circuit for LED of output current |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206977752U true CN206977752U (en) | 2018-02-06 |
Family
ID=61406838
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720783667.2U Expired - Fee Related CN206977752U (en) | 2017-06-30 | 2017-06-30 | A kind of adjustable constant current driver circuit for LED of output current |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206977752U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107105552A (en) * | 2017-06-30 | 2017-08-29 | 湖州升谱电子科技有限公司 | A kind of adjustable constant current driver circuit for LED of output current |
| CN108591580A (en) * | 2018-04-03 | 2018-09-28 | 哈尔滨汽轮机厂有限责任公司 | A kind of simple servo valve drive and servo valve driving method |
-
2017
- 2017-06-30 CN CN201720783667.2U patent/CN206977752U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107105552A (en) * | 2017-06-30 | 2017-08-29 | 湖州升谱电子科技有限公司 | A kind of adjustable constant current driver circuit for LED of output current |
| CN108591580A (en) * | 2018-04-03 | 2018-09-28 | 哈尔滨汽轮机厂有限责任公司 | A kind of simple servo valve drive and servo valve driving method |
| CN108591580B (en) * | 2018-04-03 | 2019-08-09 | 哈尔滨汽轮机厂有限责任公司 | A kind of simple servo valve drive and servo valve driving method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180206 Termination date: 20180630 |