CN107426878A - A kind of drive circuit that LED output currents are selected by jack - Google Patents
A kind of drive circuit that LED output currents are selected by jack Download PDFInfo
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- CN107426878A CN107426878A CN201710749097.XA CN201710749097A CN107426878A CN 107426878 A CN107426878 A CN 107426878A CN 201710749097 A CN201710749097 A CN 201710749097A CN 107426878 A CN107426878 A CN 107426878A
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
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- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The present invention provides a kind of drive circuit that LED output currents are selected by jack, including the input power being sequentially connected, EMI circuits, rectification circuit and control output regulating circuitry, the control output regulating circuitry includes light modulation driving chip, the light modulation driving chip is connected with metal-oxide-semiconductor Q1 and sampling resistor R6, the output end of the metal-oxide-semiconductor Q1 and the output end of rectification circuit are connected with some lead-out terminals jointly, metal-oxide-semiconductor Q2 and metal-oxide-semiconductor Q3 is accessed between the light modulation driving chip and the sampling resistor R6, the metal-oxide-semiconductor Q2 is connected with resistance R4, the metal-oxide-semiconductor Q3 is connected with resistance R5, first comparator is connected between the metal-oxide-semiconductor Q2 and the resistance R2, the second comparator is connected between the metal-oxide-semiconductor Q3 and the resistance R1.The present invention to the selection of jack by realizing that the output current to LED carries out the function of selection, the scope of application of the power drives of raising.
Description
Technical field
The invention belongs to field of LED drive technology, and in particular to a kind of driving electricity that LED output currents are selected by jack
Road.
Background technology
In existing technology, the output current of traditional LED driver is single, and the sampling of chip is dimmed by adjusting
Resistance obtains the output current uniquely determined, it is impossible to according to real-time demand the electric current of output is effectively adjusted
Section, it is impossible to meet the use demand of different lamps, influence use and the dimming scope of LED drivings.
The content of the invention
It is an object of the invention to provide a kind of drive circuit that LED output currents are selected by jack, by jack
Select to realize that the output current to LED carries out the function of selection, the scope of application of the power drives of raising.
The invention provides following technical scheme：
It is a kind of by jack select LED output currents drive circuit, including be sequentially connected input power, EMI circuits,
Rectification circuit and control output regulating circuitry, the control output regulating circuitry include light modulation driving chip, the light modulation driving
Chip is connected with metal-oxide-semiconductor Q1 and sampling resistor R6, and the output end of the metal-oxide-semiconductor Q1 and the output end of rectification circuit are connected with jointly
Some lead-out terminals, lead-out terminal includes terminal 1, terminal 2, terminal 3 and terminal 4, between the terminal 3 and the rectification circuit
Resistance R2, the light modulation driving chip and the sampling electricity are provided with provided with resistance R1, between the terminal 4 and the rectification circuit
Hindering and access metal-oxide-semiconductor Q2 and metal-oxide-semiconductor Q3 between R6, the metal-oxide-semiconductor Q2 is connected with resistance R4, the metal-oxide-semiconductor Q3 and is connected with resistance R5,
First comparator is connected between the metal-oxide-semiconductor Q2 and the resistance R2, is connected between the metal-oxide-semiconductor Q3 and the resistance R1
Second comparator.
Preferably, when output end jack connects the terminal 1 and the terminal 2, the metal-oxide-semiconductor Q2 and the metal-oxide-semiconductor Q3
Do not work, output current now is minimum；It is described when lead-out terminal jack, which connects, exports the terminal 1 and the terminal 3
Metal-oxide-semiconductor Q3 is in the conduction state, the current value increase of output；When lead-out terminal jack connects the output terminal 1 and the terminal 4
When, the metal-oxide-semiconductor Q2 is in the conduction state, and the metal-oxide-semiconductor Q3 does not work, and output current value now is maximum.
Preferably, one end of the metal-oxide-semiconductor Q1 is grounded, and resistance R3 is connected between the earth terminal of the metal-oxide-semiconductor Q1.
Preferably, transformer and filter circuit, the metal-oxide-semiconductor are additionally provided between the rectification circuit and the lead-out terminal
Q1 output end connects the transformer, makes electric current more stable.
Preferably, the rectification circuit is bridge rectifier.
Preferably, the output current of the drive circuit is 500mA-900mA.
The beneficial effects of the invention are as follows：By the voltage of jack compared with reference voltage and feed back to light modulation driving core
At the sampling resistor of piece, it is achieved thereby that by realizing that the output current to LED carries out the function of selection to the selection of jack,
The scope of application of the power drives greatly improved；Different output connections, by backfeed loop, is controlled to metal-oxide-semiconductor, with
This adjusts the resistance of sampling resistor in circuit, by the regulation of resistance, changes the size of current in circuit, to the electric current of output
Effectively adjusted.
Brief description of the drawings
Accompanying drawing is used for providing a further understanding of the present invention, and a part for constitution instruction, the reality with the present invention
Apply example to be used to explain the present invention together, be not construed as limiting the invention.In the accompanying drawings：
Fig. 1 is schematic structural view of the invention.
Embodiment
The drive circuit of LED output currents is selected by jack as shown in figure 1, a kind of, including the input electricity being sequentially connected
Source, EMI circuits, rectification circuit and control output regulating circuitry, rectification circuit is bridge rectifier.Control output regulating circuitry
Including dimming driving chip, light modulation driving chip is connected with metal-oxide-semiconductor Q1 and sampling resistor R6, metal-oxide-semiconductor Q1 one end ground connection, MOS
Resistance R3 is connected between pipe Q1 earth terminal.Metal-oxide-semiconductor Q1 output end and the output end of rectification circuit are connected with some jointly
Lead-out terminal, lead-out terminal include terminal 1, terminal 2, terminal 3 and terminal 4, change are additionally provided between rectification circuit and lead-out terminal
Depressor and filter circuit, metal-oxide-semiconductor Q1 output end connection transformer, make electric current more stable.It is provided between terminal 3 and rectification circuit
Resistance R1, resistance R2 is provided between terminal 4 and rectification circuit, dims and metal-oxide-semiconductor Q2 is accessed between driving chip and sampling resistor R6
Resistance R4 is connected with metal-oxide-semiconductor Q3, metal-oxide-semiconductor Q2, metal-oxide-semiconductor Q3 is connected with resistance R5, and is connected between metal-oxide-semiconductor Q2 and resistance R2
One comparator, the second comparator is connected between metal-oxide-semiconductor Q3 and resistance R1.
As shown in figure 1, a kind of drive circuit for selecting LED output currents by jack is in the course of the work, there is the He of terminal 1
2,1 and 3,1 and 4, three kinds of different output connections, by backfeed loop, metal-oxide-semiconductor is controlled, adjusted with this in circuit
The resistance of sampling resistor, by the regulation of resistance, change the size of current in circuit, the electric current of output is effectively adjusted
Section.Wherein, when output end jack connects 1 and 2 two terminal of output, metal-oxide-semiconductor Q2, Q3 do not work, and R6 is as sampling
The CS pin of resistance access light modulation driving chip, output current now is minimum, about 500mA；When lead-out terminal jack connects output
During end 1 and 3, R1 access circuits, R1 voltage compared with the reference voltage of comparator, give by the signal output after comparing
Metal-oxide-semiconductor Q3, Q2 are off state, and metal-oxide-semiconductor Q3 is in the conduction state, and R5 is in parallel with R6, makes the sampling of light modulation driving chip
The resistance of resistance diminishes, and increases the electric current in loop, increases the current value of output, about 700mA；Similarly, output end is worked as
When sub- jack connects output end 1 and 4, R2 access circuits, R2 makes metal-oxide-semiconductor Q2 in the conduction state by backfeed loop, metal-oxide-semiconductor Q3
Do not work, by R4 access circuits in parallel with R6, resistance now is minimum, and the current value in loop is maximum, about 900mA.
In addition resistance R4, R5, R6 can also be adjusted, three can be adjusted out according to the different demands used
Kind current value, to adapt to various operating modes, has preferably catered to the demand in market.
The preferred embodiments of the present invention are the foregoing is only, are not intended to limit the invention, although with reference to foregoing reality
Apply example the present invention is described in detail, for those skilled in the art, it still can be to foregoing each implementation
Technical scheme described in example is modified, or carries out equivalent substitution to which part technical characteristic.All essences in the present invention
God any modification, equivalent substitution and improvements made etc., should be included in the scope of the protection with principle.
Claims (6)
1. a kind of drive circuit that LED output currents are selected by jack, it is characterised in that including the input electricity being sequentially connected
Source, EMI circuits, rectification circuit and control output regulating circuitry, the control output regulating circuitry include light modulation driving chip, institute
State light modulation driving chip and be connected with metal-oxide-semiconductor Q1 and sampling resistor R6, the output end of the metal-oxide-semiconductor Q1 and the output end of rectification circuit
Be connected with some lead-out terminals jointly, lead-out terminal includes terminal 1, terminal 2, terminal 3 and terminal 4, the terminal 3 with it is described whole
Resistance R1 is provided between current circuit, is provided with resistance R2 between the terminal 4 and the rectification circuit, the light modulation driving chip with
Metal-oxide-semiconductor Q2 is accessed between the sampling resistor R6 and metal-oxide-semiconductor Q3, the metal-oxide-semiconductor Q2 are connected with resistance R4, the metal-oxide-semiconductor Q3 companies
Resistance R5 is connected to, first comparator, the metal-oxide-semiconductor Q3 and the resistance are connected between the metal-oxide-semiconductor Q2 and the resistance R2
The second comparator is connected between R1.
A kind of 2. drive circuit that LED output currents are selected by jack according to claim 1, it is characterised in that when
When output end jack connects the terminal 1 and the terminal 2, the metal-oxide-semiconductor Q2 and the metal-oxide-semiconductor Q3 do not work, now defeated
Go out electric current minimum；When lead-out terminal jack, which connects, exports the terminal 1 and the terminal 3, the metal-oxide-semiconductor Q3 is on shape
State, the current value increase of output；When lead-out terminal jack, which connects, exports the terminal 1 and the terminal 4, at the metal-oxide-semiconductor Q2
In conducting state, the metal-oxide-semiconductor Q3 does not work, and output current value now is maximum.
A kind of 3. drive circuit that LED output currents are selected by jack according to claim 1, it is characterised in that institute
Metal-oxide-semiconductor Q1 one end ground connection is stated, resistance R3 is connected between the earth terminal of the metal-oxide-semiconductor Q1.
A kind of 4. drive circuit that LED output currents are selected by jack according to claim 1, it is characterised in that institute
State and transformer and filter circuit are additionally provided between rectification circuit and the lead-out terminal, the output end connection institute of the metal-oxide-semiconductor Q1
State transformer.
A kind of 5. drive circuit that LED output currents are selected by jack according to claim 1, it is characterised in that institute
It is bridge rectifier to state rectification circuit.
A kind of 6. drive circuit that LED output currents are selected by jack according to claim 1, it is characterised in that institute
The output current for stating drive circuit is 500mA-900mA.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710749097.XA CN107426878B (en) | 2017-08-28 | 2017-08-28 | A kind of driving circuit for selecting LED to export electric current by jack |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710749097.XA CN107426878B (en) | 2017-08-28 | 2017-08-28 | A kind of driving circuit for selecting LED to export electric current by jack |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107426878A true CN107426878A (en) | 2017-12-01 |
| CN107426878B CN107426878B (en) | 2019-07-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710749097.XA Active CN107426878B (en) | 2017-08-28 | 2017-08-28 | A kind of driving circuit for selecting LED to export electric current by jack |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090128055A1 (en) * | 2007-11-15 | 2009-05-21 | Samsung Electro-Mechanics Co., Ltd. | Apparatus for driving light emitting element |
| CN103269541A (en) * | 2013-05-08 | 2013-08-28 | 珠海雷特电子科技有限公司 | LED constant-current controller integrating three types of output current specifications |
| CN204598413U (en) * | 2015-05-13 | 2015-08-26 | 深圳市垅运照明电器有限公司 | A kind of LED light adjusting circuit possessing multiple current and select |
| CN106413201A (en) * | 2016-11-23 | 2017-02-15 | 赛尔富电子有限公司 | Constant-current power supply with various current outputs for LED lamps |
| CN206004953U (en) * | 2016-08-31 | 2017-03-08 | 上海顿格电子贸易有限公司 | A kind of adjustable LED drive circuit of output current |
-
2017
- 2017-08-28 CN CN201710749097.XA patent/CN107426878B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090128055A1 (en) * | 2007-11-15 | 2009-05-21 | Samsung Electro-Mechanics Co., Ltd. | Apparatus for driving light emitting element |
| CN103269541A (en) * | 2013-05-08 | 2013-08-28 | 珠海雷特电子科技有限公司 | LED constant-current controller integrating three types of output current specifications |
| CN204598413U (en) * | 2015-05-13 | 2015-08-26 | 深圳市垅运照明电器有限公司 | A kind of LED light adjusting circuit possessing multiple current and select |
| CN206004953U (en) * | 2016-08-31 | 2017-03-08 | 上海顿格电子贸易有限公司 | A kind of adjustable LED drive circuit of output current |
| CN106413201A (en) * | 2016-11-23 | 2017-02-15 | 赛尔富电子有限公司 | Constant-current power supply with various current outputs for LED lamps |
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| Publication number | Publication date |
|---|---|
| CN107426878B (en) | 2019-07-02 |
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