CN103179727B - LED flashing control circuitry and alarm - Google Patents
LED flashing control circuitry and alarm Download PDFInfo
- Publication number
- CN103179727B CN103179727B CN201110435630.8A CN201110435630A CN103179727B CN 103179727 B CN103179727 B CN 103179727B CN 201110435630 A CN201110435630 A CN 201110435630A CN 103179727 B CN103179727 B CN 103179727B
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- China
- Prior art keywords
- constant current
- led
- type flip
- flip flop
- current chip
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- 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
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
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- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
A kind of LED flashing control circuitry, LED for driving constant current carries out flicker and controls, comprise the switch for the plant-grid connection of control LED flashing control circuitry and constant current chip, described LED is connected between described switch and the current output terminal of constant current chip, wherein the negative pole of LED is electrically connected with the current output terminal of constant current chip, the earth terminal ground connection of described constant current chip; Described circuit comprises the control module be connected between described switch and the power input of constant current chip, and described control module periodically exports high level and low level, and described constant current chip obtains or lose the job electric current.Foregoing circuit controls the break-make of constant current chip by controlling the trigger condition of d type flip flop, and then realizes controlling the electric current by LED, thus can control LED, and circuit structure is simple, and stable performance, is easy to be grasped by majority, is convenient to extensive use.In addition, a kind of alarm is also provided.
Description
[technical field]
The present invention relates to flashing circuit, particularly relate to a kind of LED flashing control circuitry and alarm.
[background technology]
A kind of LED flashing circuit comprises power supply, single-chip microcomputer, switching tube and LED.The general principle of circuit is utilize single-chip microcomputer to export conducting and cut-off that the impulse waveform of certain frequency carrys out control switch pipe, and then realizes the flicker of LED load by conducting and the cut-off of switching tube.
This circuit needs software control, because program difference is large, and program quality varies with each individual, and therefore, the situations such as deadlock, program fleet that in use there will be cause circuit stability poor.Meanwhile, because employ single-chip microcomputer, therefore actual use procedure requires a lot, and such as, single-chip microcomputer needs the regular hour to debug and testing authentication, and single-chip microcomputer price is relatively high.
[summary of the invention]
Based on this, be necessary to provide a kind of low cost, stability high, use simple LED flashing control circuitry.
A kind of LED flashing control circuitry, LED for driving constant current carries out flicker and controls, comprise the switch for the plant-grid connection of control LED flashing control circuitry and constant current chip, described LED is connected between described switch and the current output terminal of constant current chip, wherein the negative pole of LED is electrically connected with the current output terminal of constant current chip, the earth terminal ground connection of described constant current chip;
Described circuit comprises the control module be connected between described switch and the power input of constant current chip, and described control module periodically exports high level and low level, and described constant current chip obtains or lose the job electric current.
Preferably, described control module comprises resistance R
1, resistance R
2, electric capacity C
1, electric capacity C
2, diode D
1, d type flip flop U
1with d type flip flop U
2, wherein:
Described d type flip flop U
1trigger end be connected power supply with power input by described switch;
Described d type flip flop U
1set end and earth terminal ground connection;
Described d type flip flop U
1clock end contact resistance R
1with electric capacity C
1, described resistance R
1the other end connects power supply by switch, described electric capacity C
1other end ground connection;
Described d type flip flop U
1clock end be connected diode D with between next state end
1, described diode D
1positive pole is held with CK and is connected, and negative pole is connected with next state end;
Described d type flip flop U
1existing state end contact resistance R successively
2, electric capacity C
2; Described electric capacity C
2one end and resistance R
2electrical connection, other end ground connection;
Described d type flip flop U
1clear terminal and resistance R
2with electric capacity C
2common port electrical connection;
Described d type flip flop U
1existing state end also with d type flip flop U
2clock end connect;
Described d type flip flop U
2d end be electrically connected with next state end, clear terminal and the equal ground connection of set end, power input is connected with power supply by switch, show state end be connected with the current input terminal of described constant current chip.
Preferably, described d type flip flop U
1, U
2be integrated form double D trigger.
Preferably, described circuit also comprises the electrochemical capacitor C for power supply voltage stabilizing
3, described electrochemical capacitor C
3one end connects power supply by switch.
Preferably, described circuit also comprises resistance R
3, described resistance R
3be connected in parallel on electric capacity C
1two ends.
Preferably, described circuit also comprises sampling resistor R
4, described sampling resistor R
4be connected electrically between the sampling end of constant current chip and ground.
Preferably, described LED is that several are in parallel.
Be necessary in addition to provide a kind of low cost, stability high, use simple alarm.
A kind of alarm, is characterized in that, comprising:
Above-mentioned LED flashing control circuitry and loud speaker, the LED strip in described loud speaker and LED flashing control circuitry joins.
Preferably, described control module controls described constant current chip with the rate-adaptive pacemaker high level of 1Hz and low level by d type flip flop and to obtain or lose the job electric current under the control of clock pulse.
Preferably, described loud speaker is connected between described constant current chip current output terminal and ground.
Foregoing circuit controls the break-make of constant current chip by controlling the trigger condition of d type flip flop, and then realizes controlling the electric current by LED, thus can control LED, and circuit structure is simple, and stable performance, is easy to be grasped by majority, is convenient to extensive use.
[accompanying drawing explanation]
Fig. 1 is a kind of structural representation of LED flashing control circuitry;
Fig. 2 is the schematic diagram of the LED flashing control circuitry in an embodiment;
Fig. 3 is the schematic diagram of the flashing control circuitry of LED in another embodiment;
Fig. 4 is a kind of circuit theory diagrams of alarm.
[embodiment]
As shown in Figure 1, be a kind of structural representation of LED flashing control circuitry.LED flashing control circuitry is used for carrying out flicker to the LED that constant current drives and controls, comprise the switch 100 for the plant-grid connection of control LED flashing control circuitry and constant current chip 200, described LED is connected between described switch 100 and the current output terminal of constant current chip 200, wherein the negative pole of LED is electrically connected with the current output terminal of constant current chip 200, the earth terminal ground connection of described constant current chip 200.LED flashing control circuitry also comprises the control module 300 be connected between described switch 100 and the power input of constant current chip 200, described control module 300 periodically exports high level and low level, thus constant current chip 200 is obtained or lose the job electric current.
Switch 100 is mainly used in the plant-grid connection of control LED flashing control circuitry.
Constant current chip 200 comprises power input (VDD), current output terminal (D), earth terminal (GND) and sampling end (CS).Power input (VDD) is connected with control module 300, and current output terminal (D) is connected with the negative pole of LED, earth terminal (GND) ground connection.Sampling end (CS) connects ground connection after sampling resistor.When the level of the current input terminal (VDD) of constant current chip 200 is high level, constant current chip 200 conducting, load LED obtains electric work; When the level of current input terminal (VDD) is low level, constant current chip 200 power-off, load LED dead electricity quits work.
Control module 300 is mainly used in periodically exporting high level and low level to constant current chip 200, constant current chip 200 periodic electric and dead electricity, make load LED periodically light and extinguish.
As shown in Figure 2, be the schematic diagram of LED flashing control circuitry.Comprise switch 100, constant current chip 200 and control module 300.
Control module 300 comprises resistance R
1, resistance R
2, electric capacity C
1, electric capacity C
2, diode D
1, d type flip flop U
1with d type flip flop U
2.
Wherein: d type flip flop U
1trigger end (D end) be connected power supply with power input (V end) by described switch 100.
D type flip flop U
1set end (S end) and earth terminal (G end) ground connection.Clock end (CK end) the contact resistance R of d type flip flop U1
1with electric capacity C
1, described resistance R
1the other end connects power supply by switch 100, described electric capacity C
1other end ground connection.
D type flip flop U
1clock end (CK end) and next state end (
end) between connect diode D
1, described diode D
1positive pole is connected with clock end (CK holds), negative pole and next state end (
end) connect.
D type flip flop U
1existing state end (Q end) contact resistance R successively
2, electric capacity C
2; Described electric capacity C
2one end and resistance R
2electrical connection, other end ground connection.
D type flip flop U
1clear terminal (R end) and resistance R
2with electric capacity C
2common port electrical connection.
D type flip flop U
1existing state end (Q end) also with d type flip flop U
2clock end (CK end) connect.
D type flip flop U
2trigger end (D end) and next state end (
end) electrical connection, clear terminal (R end) and set end (S end) all ground connection, power input (V end) is connected with power supply by switch 100, and existing state end (Q end) is connected with the current input terminal of described constant current chip 200.
Preferably, d type flip flop U
1with d type flip flop U
2for integrated form double D trigger.
The logical relation of each pin of D flip-flop is as in the table below:
Wherein, × representing that its logical value and this row State Transferring have nothing to do, Note 1 represents that current potential changes.
As above show, for the truth table of d type flip flop, (the R=0 when the clear terminal (R end) of trigger, set end (S end) are all low level can be seen from table, S=0), when there is rising edge pulse in clock end (CK end), trigger will produce action, existing state end (Q end) just can follow the state of trigger end (D end), namely trigger end (D end) is also high level for showing state end (Q end) during high level, otherwise is also all low level; When clear terminal (R end), set end (S end) are respectively high and low level (R=1, S=0), Q holds perseverance to be low level, while next state end (
end) perseverance is high level.
Based on above-described embodiment, the course of work of circuit is as shown in Figure 2: when switch 100 closes, the moment (t that power supply is connected
0moment), electric capacity C
1, electric capacity C
2voltage is 0.D type flip flop U
1clear terminal (R end) and set end (S end) be low level (i.e. R=0, S=0), now d type flip flop U
1existing state end (Q end) be low level, d type flip flop U
1next state end (
end) be high level.D type flip flop U
2existing state end (Q end) be low level, d type flip flop U
2next state end (
end) be high level.
Switch 100 connects rear power supply by resistance R
1to electric capacity C
1charging, electric capacity C
1terminal voltage raises gradually.As electric capacity C
1both end voltage exceedes (t after the clock threshold level of trigger
1moment), d type flip flop U
1just once inside out action to be performed.Due to now d type flip flop U
1trigger end (D end) be high level, then d type flip flop U after trigger action
1existing state end (Q end) become high level, simultaneously d type flip flop U
1next state end (
end) become low level.Electric capacity C
2both end voltage raises gradually, d type flip flop U
2clock end (CK end) there is rising edge pulse, d type flip flop U
2rotary movement will be carried out, d type flip flop U
2existing state end (Q end) become high level, d type flip flop U
2next state end (
end) become low level.The power input (VDD) of constant current chip 200 is connected and is started working, and load LED is bright.The next state end of d type flip flop U1 (
end) become low level after, electric capacity C
1by diode D
1to ground electric discharge, electric capacity C
1both end voltage is down to low level gradually.
As electric capacity C
2(t after both end voltage becomes high level
2moment), d type flip flop U
1clear terminal (R end), set end (S end) state be respectively high and low (i.e. R=1, S=0), then d type flip flop U
1existing state end (Q end) become low level, d type flip flop U
1next state end (
end) become high level.
D type flip flop U
1existing state end (Q end) become low level after, electric capacity C
2pass through R
2electric discharge, electric capacity C
2both end voltage is down to low level (t gradually
3moment), now d type flip flop U
1state got back to again switch 100 connect moment state (i.e. R=0, S=0, Q=0, CK=0, D=1).
After this electric capacity C
1, electric capacity C
2and d type flip flop U
1again can according to above-mentioned t
0-t
2-t
3-t
0change in process, in this change procedure, as d type flip flop U
1existing state end (Q end) become high level from low level, i.e. d type flip flop U
2clock end (CK end) when there is rising edge pulse, d type flip flop U
2once inside out action will be carried out, d type flip flop U
2existing state end (Q end) become low level, d type flip flop U
2next state end (
end) become high level, now constant current chip 200 power-off quits work, and load LED extinguishes.Scitillation process that load LED one-period one bright one goes out that Here it is, after this circuit can repeat process above automatically, d type flip flop U
2existing state end (Q end) alternately export high and low level, realize the flicker of LED.Further, adjusting resistance R
2with electric capacity C
2value can adjust flicker frequency.
Based on above-described embodiment, further, as shown in Figure 3, be the schematic diagram of LED flashing control circuitry in another embodiment.Wherein, LED flashing control circuitry also comprises electrochemical capacitor C
3, described electrochemical capacitor C
3one end connects power supply by switch, other end ground connection, described electrochemical capacitor C
3for power supply voltage stabilizing.
Further, LED flashing control circuitry also comprises sampling resistor R
4, described sampling resistor R
4between the sampling end being connected electrically in constant current chip 200 and ground.
Control module 300 also comprises resistance R
3, described resistance R
3be connected in parallel on electric capacity C
1two ends, resistance R
3for dividing potential drop.
In LED flashing control circuitry, LED is that several are in parallel.
Based on above-described embodiment, a kind of alarm, comprises above-mentioned LED flashing control circuitry and loud speaker SP, and the LED strip in loud speaker SP and LED flashing control circuitry joins.Control module 300 in circuit controls described constant current chip 200 with the rate-adaptive pacemaker high level of 1Hz and low level by d type flip flop and to obtain or lose the job electric current under the control of clock pulse.
In the present embodiment, loud speaker SP is connected between constant current chip 200 current output terminal and ground.
In the present embodiment, as shown in Figure 4, be the circuit theory diagrams of alarm.Fig. 4 is specially a kind of alarm circuit.What d type flip flop adopted is integrated form double D trigger.Load is 24 red LED and loud speaker SP.Power supply is powered by polymer during 3.7V1.25A.Wherein, resistance R
1for 18M Ω, resistance R
2for 18M Ω, electric capacity C
1for 104pF, electric capacity C
2for 104pF, diode D
1model is IN4148, d type flip flop U
1with d type flip flop U
2for integrated form double D trigger, constant current chip model is QX7136, electrochemical capacitor C
3for 47u63v, divider resistance R
3for 47M Ω, sampling resistor R
4be 12 Ω.After setting above-mentioned parameter, the load LED in circuit shown in Fig. 4 can with the frequency scintillation of 1HZ, and when switch disconnects, load LED stops flicker and loud speaker SP stop alarm sound.
The above embodiment only have expressed several execution mode of the present invention, and it describes comparatively concrete and detailed, but therefore can not be interpreted as the restriction to the scope of the claims of the present invention.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection range of patent of the present invention should be as the criterion with claims.
Claims (9)
1. a LED flashing control circuitry, LED for driving constant current carries out flicker and controls, comprise the switch for the plant-grid connection of control LED flashing control circuitry and constant current chip, described LED is connected between described switch and the current output terminal of constant current chip, wherein the negative pole of LED is electrically connected with the current output terminal of constant current chip, the earth terminal ground connection of described constant current chip;
It is characterized in that, described circuit comprises the control module be connected between described switch and the power input of constant current chip, and described control module periodically exports high level and low level and to obtain or lose the job electric current to control described constant current chip; Described control module comprises resistance R
1, resistance R
2, electric capacity C
1, electric capacity C
2, diode D
1, d type flip flop U
1with d type flip flop U
2, wherein:
Described d type flip flop U
1trigger end be connected power supply with power input by described switch;
Described d type flip flop U
1set end and earth terminal ground connection;
Described d type flip flop U
1clock end contact resistance R
1with electric capacity C
1, described resistance R
1the other end connects power supply by switch, described electric capacity C
1other end ground connection;
Described d type flip flop U
1clock end be connected diode D with between next state end
1, described diode D
1positive pole is connected with clock end, and negative pole is connected with next state end;
Described d type flip flop U
1existing state end contact resistance R successively
2, electric capacity C
2; Described electric capacity C
2one end and resistance R
2electrical connection, other end ground connection;
Described d type flip flop U
1clear terminal and resistance R
2with electric capacity C
2common port electrical connection;
Described d type flip flop U
1existing state end also with d type flip flop U
2clock end connect;
Described d type flip flop U
2d trigger end be electrically connected with next state end, clear terminal and the equal ground connection of set end, power input is connected with power supply by switch, and existing state end is connected with the current input terminal of described constant current chip.
2. LED flashing control circuitry according to claim 1, is characterized in that, described d type flip flop U
1, U
2be integrated form double D trigger.
3. LED flashing control circuitry according to claim 1, is characterized in that, described circuit also comprises the electrochemical capacitor C for power supply voltage stabilizing
3, described electrochemical capacitor C
3one end connects power supply by switch.
4. LED flashing control circuitry according to claim 1, is characterized in that, described circuit also comprises resistance R
3, described resistance R
3be connected in parallel on electric capacity C
1two ends.
5. LED flashing control circuitry according to claim 1, is characterized in that, described circuit also comprises sampling resistor R
4, described sampling resistor R
4be connected electrically between the sampling end of constant current chip and ground.
6. LED flashing control circuitry according to claim 1, is characterized in that, described LED is that several are in parallel.
7. an alarm, is characterized in that, comprising:
LED flashing control circuitry as described in claim 1 to 6 any one and loud speaker, the LED strip in described loud speaker and LED flashing control circuitry joins.
8. alarm according to claim 7, is characterized in that, described control module controls described constant current chip with the rate-adaptive pacemaker high level of 1Hz and low level by d type flip flop and to obtain or lose the job electric current under the control of clock pulse.
9. alarm according to claim 7, is characterized in that, described loud speaker is connected between described constant current chip current output terminal and ground.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110435630.8A CN103179727B (en) | 2011-12-22 | 2011-12-22 | LED flashing control circuitry and alarm |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110435630.8A CN103179727B (en) | 2011-12-22 | 2011-12-22 | LED flashing control circuitry and alarm |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103179727A CN103179727A (en) | 2013-06-26 |
| CN103179727B true CN103179727B (en) | 2015-09-23 |
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ID=48639273
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201110435630.8A Expired - Fee Related CN103179727B (en) | 2011-12-22 | 2011-12-22 | LED flashing control circuitry and alarm |
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| Country | Link |
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| CN (1) | CN103179727B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104684172A (en) * | 2013-11-28 | 2015-06-03 | 海洋王（东莞）照明科技有限公司 | Lamp flash drive control circuit |
| CN104936354B (en) * | 2015-06-26 | 2018-10-19 | 上海沪工汽车电器有限公司 | Lamp control module and control method in a kind of automobile-used rear chamber |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101330785A (en) * | 2008-08-04 | 2008-12-24 | 梁莉丽 | High voltage AC light-adjusting controller for general constant-current LED |
| CN101808453A (en) * | 2010-04-14 | 2010-08-18 | 上海晶丰明源半导体有限公司 | LED lighting driving circuit and method by using compatible silicon controlled light adjuster to adjust light |
| CN101827477A (en) * | 2009-03-06 | 2010-09-08 | 夏普株式会社 | Led drive circuit, LED lamp, LED lighting apparatus and LED illuminator |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7321203B2 (en) * | 2006-03-13 | 2008-01-22 | Linear Technology Corporation | LED dimming control technique for increasing the maximum PWM dimming ratio and avoiding LED flicker |
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2011
- 2011-12-22 CN CN201110435630.8A patent/CN103179727B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101330785A (en) * | 2008-08-04 | 2008-12-24 | 梁莉丽 | High voltage AC light-adjusting controller for general constant-current LED |
| CN101827477A (en) * | 2009-03-06 | 2010-09-08 | 夏普株式会社 | Led drive circuit, LED lamp, LED lighting apparatus and LED illuminator |
| CN101808453A (en) * | 2010-04-14 | 2010-08-18 | 上海晶丰明源半导体有限公司 | LED lighting driving circuit and method by using compatible silicon controlled light adjuster to adjust light |
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|---|---|
| CN103179727A (en) | 2013-06-26 |
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Granted publication date: 20150923 Termination date: 20181222 |