CN105792422B - A kind of switch switching circuit for LED - Google Patents
A kind of switch switching circuit for LED Download PDFInfo
- Publication number
- CN105792422B CN105792422B CN201610222016.6A CN201610222016A CN105792422B CN 105792422 B CN105792422 B CN 105792422B CN 201610222016 A CN201610222016 A CN 201610222016A CN 105792422 B CN105792422 B CN 105792422B
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- CN
- China
- Prior art keywords
- led
- frequency divider
- signal
- passage detection
- state machine
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Classifications
-
- 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]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
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- Led Devices (AREA)
- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The invention belongs to electronic technology field, and in particular to a kind of switch switching circuit for LED.Switch switching circuit for LED of the invention, including power supply, LED modules, drive circuit, it is characterised in that also including control circuit, the LED modules are connected with power supply and drive circuit respectively, and the control circuit is connected with power supply and drive circuit respectively；The switching that the control circuit is used to control between the switch of LED in LED modules and different LEDs.Beneficial effects of the present invention are, solve the contradiction of detection switch point and false triggering, and compared to many traditional switching moldings, actually required extraneous control can be accomplished most to simplify, realize a switch and come while controlling switching the two functions between the switch of LED and each LED.
Description
Technical field
The invention belongs to electronic technology field, and in particular to a kind of switch switching circuit for LED.
Background technology
In LED illumination technology, LED drive circuit is one of key link.LED common are constant current, constant pressure, current limliting,
Various type of drive such as pulse.With a large amount of and large-scale use of LED, simplify, intuitively, convenient control circuit has very much
It is necessary.For this demand of opening and closing that single switch controls multiple LEDs, common method is to install such as segmentation to open
This kind of device is closed, this kind of device employs extra periphery circuit design, add decoder, power supply circuit, relay, switch
Corresponding LED switch is controlled etc. extra control module, it is achieved thereby that the switching of LED.But increasing peripheral module can be tight
Ghost image rings the complexity and cost of product, and the failure that more modules are likely to increase as well device may.
Simplified for maximum-norm, in addition to chip can be changed, the peripheral structure of chip must keep constant, this meaning
Can only accomplish to switch and switch the two functions using a switch.Common method be detect rectifier bridge after it is unidirectional
The magnitude of voltage of alternating signal port, represents if null value is reached and once switchs, and at this moment system will cut to LED
Change.It is exactly the problem of test point but the method also has such a problem, due to the alternating current more than LED using 50Hz, i.e., often
A null value will be produced every 10ms.Detection rectification bridge port will be produced and switched by mistake, i.e., be possible to mistake every 10ms
Switching by mistake.And if by detecting through the waveform after electric capacity shaping, cannot but be found corresponding to switching on the waveform
Null value.
The content of the invention
The invention aims to solve the above problems, it is proposed that come to accomplish opening for LED simultaneously using a switch
The switch switching circuit for LED of the switching between pass and each LED.
The technical scheme is that：A kind of switch switching circuit for LED, including power supply, LED modules, driving electricity
Road, it is characterised in that also including control circuit, the LED modules are connected with power supply and drive circuit respectively, the control circuit
It is connected with power supply and drive circuit respectively；The control circuit is used to control the switch and difference LED of LED in LED modules
Switching between lamp；
The control circuit includes that zero passage detection unit, oscillator, frequency divider, finite state machine, d type flip flop and RS are latched
Device；The oscillator is connected with frequency divider and finite state machine respectively, and it is that frequency divider and finite state machine are provided that oscillator is used for
Clock signal；The input of the zero passage detection unit is connected with power supply, first output end and frequency divider of zero passage detection unit
Input connection, the output end of frequency divider is connected with the clock signal input terminal of d type flip flop, and the zero passage detection unit is used for
Whether the input for detecting power supply is zero, if so, then send enabling signal to frequency divider, frequency divider will export clock signal to D
The clock signal input terminal of trigger；Second output end of the zero passage detection unit is connected with the D inputs of d type flip flop；D is touched
The output end for sending out device is connected with the set end of RS latch；3rd output end of zero passage detection unit and the signal end of RS latch
Connection；The first input end of finite state machine is connected with the 3rd output end of zero passage detection unit, and the second of finite state machine is defeated
Enter end to be connected with the output end of RS latch.
Beneficial effects of the present invention are the contradiction for solving detection switch point and false triggering, and compared to traditional many
Switching molding, actually required extraneous control can be accomplished most to simplify, realize a switch come and meanwhile control the switch of LED with
Switching the two functions between each LED.
Brief description of the drawings
Fig. 1 adds the LED after control circuit to drive schematic diagram；
Fig. 2 controls the concrete structure schematic diagram of circuit；
Oscillogram when Fig. 3 normal works are not triggered；
Oscillogram during Fig. 4 handover triggers.
Specific embodiment
Below in conjunction with the accompanying drawings, technical scheme is described in detail：
As shown in figure 1, adjunct circuit of the present invention can be integrated in LED control chips.Concrete structure as shown in Fig. 2 wherein,
Oscillator persistently can provide clock signal to frequency divider and finite state machine unit.The function of zero passage detection form unit is that detection is whole
Whether stream bridge input is zero, and interior placement keeps and Protection Counter Functions, if being judged as zero, zero passage detection in rectifier bridge input side
Unit will send into enable signal the D ends of frequency divider and d type flip flop unit.Frequency divider is only having zero passage detection signal
When the square wave of oscillator can just be divided, the signal that will usually block in frequency divider so that CLK ports are always low electricity
Flat, the signal after frequency dividing will be admitted to the CLK ends of d type flip flop unit, adjust the frequency of oscillator and the frequency dividing of frequency divider
Number can be with the impulse hits time of controlled output to d type flip flop unit CLK ends, such that it is able to judge that zero crossing continues at diode
Time.If d type flip flop is finally triggered, signal will be admitted to the set end of RS latch units, and be ultimately delivered to limited
In state machine, finite state machine under the clock that oscillator is exported, with being protected the input control signal with RS latch
Hold, switch and return to reset signal to functions such as RS latch.
Next will discuss and analyze with reference to the figure pin switching circuit.The work of LED etc. can be summarized as following four
Situation is planted to discuss：Power up, power process, course of normal operation and handoff procedure.
When upper electric, chip power supply voltage is gradually increasing chip, and after chip minimum supply voltage is reached, chip starts to open
Dynamic and normal work.
Chip supply voltage of chip during power-off is gradually reduced, and finally closes chip.
In normal operation, chip normal power supply, its work wave as shown in figure 3, zero passage detection module every
10ms can detect the zero cross signal of input, and frequency divider can be started after detecting zero cross signal.But due to each zero passage not
Long time can be continued, so d type flip flop will not be triggered.And crossed under nought state non-, frequency divider can be shielded.So volume
Outer device will not have any influence to the work of usually LED.
If necessary to switch, then can be with toggle switch.It is assumed that due to the energy storage of electric capacity during toggle switch,
The drive circuit of LED is not off, and because the time that voltage is zero has exceeded Tsw, then frequency divider is had on one
Edge is risen, therefore d type flip flop can successfully send out trigger signal to latch, and the limited of the drive circuit is changed by latch
State machine, so as to successfully switch LED.After switching, state machine can wait next switching again by latch reset again
The arrival of signal.
In view of the foregoing it is apparent that, the control circuit successfully solves the contradiction of detection switch point and false triggering, and
Compared to many traditional switching moldings, actually required extraneous control can be accomplished most to simplify, with sizable advantage.
Claims (1)
1. a kind of switch switching circuit for LED, including power supply, LED modules, drive circuit, it is characterised in that also including control
Circuit processed, the LED modules are connected with power supply and drive circuit respectively, and the control circuit connects with power supply and drive circuit respectively
Connect；The switching that the control circuit is used to control between the switch of LED in LED modules and different LEDs；
The control circuit includes zero passage detection unit, oscillator, frequency divider, finite state machine, d type flip flop and RS latch；
The oscillator is connected with frequency divider and finite state machine respectively, and it is that frequency divider and finite state machine provide clock that oscillator is used for
Signal；The input of the zero passage detection unit is connected with power supply, and the first output end of zero passage detection unit is defeated with frequency divider
Enter end connection, the output end of frequency divider is connected with the clock signal input terminal of d type flip flop, the zero passage detection unit is used to detect
Whether the input of power supply is zero, if so, then send enabling signal to frequency divider, frequency divider will export clock signal and be triggered to D
The clock signal input terminal of device；Second output end of the zero passage detection unit is connected with the D inputs of d type flip flop；D type flip flop
Output end be connected with the set end of RS latch；3rd output end of zero passage detection unit connects with the signal end of RS latch
Connect；The first input end of finite state machine is connected with the 3rd output end of zero passage detection unit, the second input of finite state machine
End is connected with the output end of RS latch；
Frequency divider can just divide the square wave of oscillator only when having zero passage detection signal, will usually block frequency divider
Interior signal so that CLK ports are always low level, the signal after frequency dividing will be admitted to the CLK ends of d type flip flop unit,
Adjust oscillator frequency and frequency divider divider ratio can with the impulse hits time of controlled output to d type flip flop unit CLK ends,
Such that it is able to judge zero crossing duration at diode；If d type flip flop is finally triggered, signal will be admitted to RS latches
The set end of device unit, and being ultimately delivered in finite state machine, finite state machine under the clock that oscillator is exported, with RS
The input control signal of latch and kept, switched and returned to function of the reset signal to RS latch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610222016.6A CN105792422B (en) | 2016-04-11 | 2016-04-11 | A kind of switch switching circuit for LED |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610222016.6A CN105792422B (en) | 2016-04-11 | 2016-04-11 | A kind of switch switching circuit for LED |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105792422A CN105792422A (en) | 2016-07-20 |
| CN105792422B true CN105792422B (en) | 2017-06-30 |
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ID=56396249
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610222016.6A Expired - Fee Related CN105792422B (en) | 2016-04-11 | 2016-04-11 | A kind of switch switching circuit for LED |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105792422B (en) |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2859082B2 (en) * | 1993-05-17 | 1999-02-17 | 日本電気アイシーマイコンシステム株式会社 | Bit clock regeneration device |
| JP5708371B2 (en) * | 2010-10-28 | 2015-04-30 | ミツミ電機株式会社 | LIGHTING POWER SUPPLY DEVICE AND HOLDING CURRENT CONTROL METHOD |
| ITMI20110546A1 (en) * | 2011-04-04 | 2012-10-05 | St Microelectronics Srl | CONTROL DEVICE FOR THE SWITCHING FREQUENCY OF A CONVERTER ALREADY RESONATING AND ITS CONTROL METHOD. |
| US9407203B2 (en) * | 2014-01-07 | 2016-08-02 | Quantumsine Acquisitions Inc. | Combined amplitude-time and phase modulation |
| CN105390091B (en) * | 2015-11-04 | 2017-12-08 | 深圳市绿源半导体技术有限公司 | LED shows enable signal control system, LED display system and display drive method |
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2016
- 2016-04-11 CN CN201610222016.6A patent/CN105792422B/en not_active Expired - Fee Related
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| Publication number | Publication date |
|---|---|
| CN105792422A (en) | 2016-07-20 |
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Granted publication date: 20170630 Termination date: 20200411 |