CN105898952A - Maximum output current setting circuit of LED driving power supply - Google Patents
Maximum output current setting circuit of LED driving power supply Download PDFInfo
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- CN105898952A CN105898952A CN201410796713.3A CN201410796713A CN105898952A CN 105898952 A CN105898952 A CN 105898952A CN 201410796713 A CN201410796713 A CN 201410796713A CN 105898952 A CN105898952 A CN 105898952A
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- circuit
- output current
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- power supply
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Abstract
The invention discloses a maximum output current setting circuit of an LED driving power supply. The circuit comprises a switching power supply output current control loop, a maximum current setting circuit, an LED lamp, an output voltage detection circuit and an output current detection circuit; the switching power supply output current control loop is connected with the LED lamp and the maximum current setting circuit; the LED lamp is connected in parallel with a current setting resistor; one end of the output voltage detection circuit is connected with the switching power supply output current control loop, and the other end of the output voltage detection circuit is connected with the maximum current setting circuit; and one end of the output current detection circuit is connected with the switching power supply output current control loop, and the other end of the output current detection circuit is connected with the maximum current setting circuit. According to the maximum output current setting circuit of the invention, one current setting resistor is connected in parallel with the load end of the LED lamp, so that the adjustment of the maximum output current of the LED driving power supply can be realized without needing any extra wires.
Description
[technical field]
The present invention relates to the technical field of LED circuit, particularly a kind of LED drive power maximum output electricity
The technical field of stream initialization circuit.
[background technology]
The method setting LED drive power maximum output current in prior art mainly has a following two:
1. set maximum output current by adjustable resistance or toggle switch: this circuit uses can
Resistance or toggle switch is adjusted to be placed in driving power supply, by regulating the size of adjustable resistance, or dial-up
The position of switch, sets maximum output current.Both modes all cannot realize higher waterproof anti-
Dirt grade；
2. realized by one current setting resistor of circuit external connection: this drive circuit is by outward
Portion's resistance changes internal current datum, thus reaches to set the purpose of maximum output current.But
Needing extra connection line to realize, circuit is complex.
[summary of the invention]
The purpose of the present invention solves the problems of the prior art exactly, proposes a kind of LED drive power maximum
Output current setting circuit, it is possible to solve defect present in prior art.
For achieving the above object, the present invention proposes a kind of LED drive power maximum output current and sets electricity
Road, controls ring, maximum current initialization circuit, LED, output voltage including switch power supply output current
Testing circuit, output current detection circuit, described switch power supply output current controls to connect on ring have LED
Lamp and maximum current initialization circuit, LED is connected in parallel to current setting resistor, described output voltage
Testing circuit one end controls ring with switch power supply output current and is connected, the output voltage detecting circuit other end
It is connected with maximum current initialization circuit, described output current detection circuit one end and Switching Power Supply output electricity
Flow control ring is connected, and the output current detection circuit other end is connected with maximum current initialization circuit, institute
State switch power supply output current and control ring by switching power circuit, light-coupled isolation feedback circuit and datum
Being composed in series, described maximum current initialization circuit is composed in series by A/D converter and single-chip microcomputer.
As preferably, described output voltage detecting circuit one end is connected in series with switching power circuit, output
The voltage detecting circuit other end is connected in series with A/D converter.
As preferably, described output current detection circuit one end is connected in series with datum, exports electric current
The testing circuit other end is connected in series with A/D converter.
As preferably, described single-chip microcomputer one end is connected in series with A/D converter, the single-chip microcomputer other end and ginseng
Examine level to be connected in series.
As preferably, also including examining leakage resistance, described inspection leakage resistance one end is connected in series with LED, inspection
The leakage resistance other end connects safety return circuit line, and described switching power circuit connects safety return circuit line.
Beneficial effects of the present invention: the present invention is controlled ring by switch power supply output current, maximum current sets
Circuit, LED, output voltage detecting circuit, output current detection circuit form, by LED
A load end current setting resistor in parallel, it is not necessary to extra wiring, it is possible to realize LED drive power
The adjustment of output maximum current, the most this mode also solves employing potentiometer or toggle switch brings
Power supply classification of waterproof decline shortcoming.
Inventive feature and advantage will combine accompanying drawing by embodiment and be described in detail.
[accompanying drawing explanation]
Fig. 1 is the front view of the present invention a kind of LED drive power maximum output current initialization circuit.
[detailed description of the invention]
Refering to Fig. 1, one LED drive power maximum output current initialization circuit of the present invention, including switch
Electric power outputting current controls ring 1, maximum current initialization circuit 2, LED 3, output voltage detecting circuit
4, output current detection circuit 5, described switch power supply output current controls to connect on ring 1 have LED 3
With maximum current initialization circuit 2, LED 3 is connected in parallel to current setting resistor 6, described output electricity
Pressure testing circuit 4 one end controls ring 1 with switch power supply output current and is connected, output voltage detecting circuit
4 other ends are connected with maximum current initialization circuit 2, described output current detection circuit 5 one end with open
Closing power supply output current regulator 1 to be connected, output current detection circuit 5 other end sets with maximum current
Determining circuit 2 to be connected, described switch power supply output current controls ring 1 by switching power circuit 11, optocoupler
Isolation feedback circuit 12 and datum 13 are composed in series, and described maximum current initialization circuit 2 is by A/D
Converter 21 and single-chip microcomputer 22 are composed in series, described output voltage detecting circuit 4 one end and Switching Power Supply
Circuit 11 is connected in series, and output voltage detecting circuit 4 other end is connected in series with A/D converter 21,
Described output current detection circuit 5 one end is connected in series with datum 13, output current detection circuit 5
The other end is connected in series with A/D converter 21, and described single-chip microcomputer 22 one end is gone here and there with A/D converter 21
Connection connects, and single-chip microcomputer 22 other end is connected in series with datum 13, also includes examining leakage resistance 7, institute
Stating inspection leakage resistance 7 one end to be connected in series with LED 3, inspection leakage resistance 7 other end connects safety return circuit
Line 71, described switching power circuit 11 connects and has safety return circuit line 14.
The course of work of the present invention:
One LED drive power maximum output current initialization circuit of the present invention in the course of the work, the present invention
Ring 1, maximum current initialization circuit 2, LED 3, output voltage inspection is controlled by switch power supply output current
Slowdown monitoring circuit 4, output current detection circuit 5 form, by the load end electricity in parallel in LED 3
Stream sets resistance 6, it is not necessary to extra wiring, it is possible to realize the tune of LED drive power output maximum current
Whole, the most this mode also solves and uses under the power supply classification of waterproof that potentiometer or toggle switch bring
The shortcoming of fall.
In start-up course, opening the starting stage, output voltage is less than the load conduction pressure of LED 3
Fall, LED 3 not yet turns on, and the A/D converter 21 in maximum current initialization circuit 2 is by output electricity
Pressure testing circuit 4 and output current detection circuit 5 detect output electric current and voltage signal, this signal
Only being determined by the current setting resistor 6 being connected in parallel in LED 3 in size, the size of this signal is with defeated
The size going out current maxima setting is certain linear ratio relation.Therefore by changing current settings electricity
Resistance 6, it is possible to indirectly determine the maximum of LED drive current.Then LED 3 begins to turn on, defeated
Go out electric current rapid increase, reach previously according to maximum current initialization circuit 2 and current setting resistor 6
The maximum current value set.
Above-described embodiment is the description of the invention, is not limitation of the invention, any to present invention letter
Monotropic change after scheme belong to protection scope of the present invention.
Claims (5)
1. a LED drive power maximum output current initialization circuit, it is characterised in that: include that Switching Power Supply is defeated
Go out current regulator (1), maximum current initialization circuit (2), LED (3), output voltage detection
Circuit (4), output current detection circuit (5), described switch power supply output current controls ring (1)
Upper connection has LED (3) and maximum current initialization circuit (2), and LED is connected in parallel on (3)
Current setting resistor (6), described output voltage detecting circuit (4) one end is had to export with Switching Power Supply
Current regulator (1) is connected, and output voltage detecting circuit (4) other end sets with maximum current
Circuit (2) is connected, described output current detection circuit (5) one end and switch power supply output current
Control ring (1) to be connected, output current detection circuit (5) other end and maximum current initialization circuit
(2) be connected, described switch power supply output current control ring (1) by switching power circuit (11),
Light-coupled isolation feedback circuit (12) and datum (13) are composed in series, and described maximum current sets
Circuit (2) is composed in series by A/D converter (21) and single-chip microcomputer (22).
2. a kind of LED drive power maximum output current initialization circuit as claimed in claim 1, its feature exists
In: described output voltage detecting circuit (4) one end is connected in series with switching power circuit (11),
Output voltage detecting circuit (4) other end is connected in series with A/D converter (21).
3. a kind of LED drive power maximum output current initialization circuit as claimed in claim 1, its feature exists
In: described output current detection circuit (5) one end is connected in series with datum (13), output
Current detection circuit (5) other end is connected in series with A/D converter (21).
4. a kind of LED drive power maximum output current initialization circuit as claimed in claim 1, its feature exists
In: described single-chip microcomputer (22) one end is connected in series with A/D converter (21), single-chip microcomputer (22)
The other end is connected in series with datum (13).
5. a kind of LED drive power maximum output current as according to any one of Claims 1-4 sets electricity
Road, it is characterised in that: also include examining leakage resistance (7), described inspection leakage resistance (7) one end and LED
Lamp (3) is connected in series, and inspection leakage resistance (7) other end connects safety return circuit line (71), described
The upper connection of switching power circuit (11) has safety return circuit line (14).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410796713.3A CN105898952A (en) | 2014-12-19 | 2014-12-19 | Maximum output current setting circuit of LED driving power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410796713.3A CN105898952A (en) | 2014-12-19 | 2014-12-19 | Maximum output current setting circuit of LED driving power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105898952A true CN105898952A (en) | 2016-08-24 |
Family
ID=56700148
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410796713.3A Pending CN105898952A (en) | 2014-12-19 | 2014-12-19 | Maximum output current setting circuit of LED driving power supply |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105898952A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110007249A (en) * | 2019-03-19 | 2019-07-12 | 江苏理工学院 | A kind of LED light driving power test method, apparatus and system |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102264173A (en) * | 2010-05-31 | 2011-11-30 | 英飞特电子（杭州）有限公司 | LED (light emitting diode) constant current driving circuit and output-voltage-adjustable circuit |
| CN202524600U (en) * | 2012-01-20 | 2012-11-07 | 深圳路明半导体照明有限公司 | Buck LED constant current drive control circuit |
| CN203968458U (en) * | 2014-06-13 | 2014-11-26 | 毛昭祺 | A kind of LED driving power maximum output current initialization circuit |
-
2014
- 2014-12-19 CN CN201410796713.3A patent/CN105898952A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102264173A (en) * | 2010-05-31 | 2011-11-30 | 英飞特电子（杭州）有限公司 | LED (light emitting diode) constant current driving circuit and output-voltage-adjustable circuit |
| CN202524600U (en) * | 2012-01-20 | 2012-11-07 | 深圳路明半导体照明有限公司 | Buck LED constant current drive control circuit |
| CN203968458U (en) * | 2014-06-13 | 2014-11-26 | 毛昭祺 | A kind of LED driving power maximum output current initialization circuit |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110007249A (en) * | 2019-03-19 | 2019-07-12 | 江苏理工学院 | A kind of LED light driving power test method, apparatus and system |
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| C06 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| TA01 | Transfer of patent application right | ||
| TA01 | Transfer of patent application right |
Effective date of registration: 20170412 Address after: 310000 room, No. 500 Binjiang District Road, Changhe street, Zhejiang, China, B306 Applicant after: Hangzhou Youte Power Co. Ltd. Address before: Hangzhou City, Zhejiang province 310000 Binjiang District Puyan Street venture Road No. 1 high-tech software park building No. 3 Applicant before: Mao Zhaoqi |
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| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20160824 |