CN200966175Y - A device for controlling the brightness of LED - Google Patents
A device for controlling the brightness of LED Download PDFInfo
- Publication number
- CN200966175Y CN200966175Y CN 200620061394 CN200620061394U CN200966175Y CN 200966175 Y CN200966175 Y CN 200966175Y CN 200620061394 CN200620061394 CN 200620061394 CN 200620061394 U CN200620061394 U CN 200620061394U CN 200966175 Y CN200966175 Y CN 200966175Y
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- control chip
- led
- main control
- chip
- power supply
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Abstract
The utility model discloses a device to control the brightness of an LED, comprising a mains power transformer, a bridge rectifier circuit, a loading drive, a piece of central control chip, a piece of memory chip and a detector circuit of voltage cross zero, wherein, a voltage output of the mains power transformer is in parallel with a filter capacitor and then is connected with a bridge rectifier circuit to constitute a DC power source of the LED light source in the loading drive; the LED is in series with a controllable silicon and a resistance and then is connected with a DC power source; a gate of the silicon control is in series with a crystal triode and the resistance and then is connected with the central control chip; the memory chip and the adjusting switch are both connected with the central control chip; the detector circuit of voltage cross zero is arranged between the central control chip and the mains power, and a power source is arranged between the central control chip and the detector circuit of voltage cross zero to run the central control chip, the memory chip and the detector circuit of voltage cross zero. Owning to the structure and the character, the utility model has the advantages of simple circuit structure, low cost, great light alternating effect and realization of visional effect.
Description
Affiliated technical field
The utility model relates to a kind of illumination control circuit field, especially a kind of device of controlling LED brightness.
Background technology one
The method of control LED brightness mainly contains at present: a kind of is electric current control method, and the electric current that flows through among the LED by change changes brightness.Each pixel all needs a controllable current source in this method, and its shortcoming is the circuit complexity, the cost height; Another kind is that PWM is the pulse-width modulation method, as China Patent No. be: 200510063068.5, name is called: " a kind of method of utilizing duty ratio control light-emitting diode luminance ", this technology is to control light-emitting diode is in " bright " state in the one-period of control signal time shared ratio in the described cycle by CPU or software approach, and utilize the persistence of vision of human eye, change brightness.Though the present invention can provide the brightness of required a plurality of grades for single light-emitting diode, but its weak point is: owing to utilize rectangular pulse to come the driven for emitting lights diode, give a pulse high level that light-emitting diode is opened sometime in the one-period in control signal, then brightness moment of light-emitting diode reaches the brightest; To low level, the brightness amplitude of variation of its light-emitting diode is bigger to extinguishing from the brightest again in brightness, therefore makes that the dimming effect of light-emitting diode is poor, is difficult to realize required dreamlike effect at high level.
Summary of the invention
The purpose of this utility model is in order to address the above problem, and provides that a kind of circuit structure is simple, cost is low, and good dimming effect can realize the device of a kind of LED of control brightness of fantasy effect.
To achieve these goals, the utility model provides a kind of device of the LED of control brightness, comprise city's power supply transformer, bridge rectifier, drive load, main control chip, storage chip and zero cross detection circuit, it is characterized in that: connect and compose the DC power supply that drives led light source in the load with bridge rectifier behind the described city power supply transformer output voltage terminal filter capacitor in parallel, described LED be connected in DC power supply after controllable silicon and resistance are connected, the described silicon controlled control utmost point is connected with transistor and resistance and is connected on the main control chip, described storage chip and by-pass cock are connected on the main control chip respectively, described zero cross detection circuit is connected between main control chip and the city's power supply, is connected between main control chip and zero cross detection circuit for main control chip, the power supply of storage chip and zero cross detection circuit work.
Described controllable silicon is an one-way SCR.
Described main control chip is a singlechip chip EM78P153SN.
One end ground connection of described storage chip, another termination main control chip.
Described by-pass cock is composed in parallel by mode switch and speed switch, and an end ground connection, and the other end connects two different pins on the main control chip respectively.
Described zero cross detection circuit is to be composed in parallel by two photoelectrical couplers.
The described power supply of powering for main control chip, storage chip and zero cross detection circuit is a D.C. regulated power supply.
The utility model compared with prior art its beneficial effect is: light on and off and the opening time of controlling LED because of the trigger impulse that utilizes controllable silicon to send by zero-crossing switching and control chip in good time, and adopt storage chip and zero cross detection circuit that the brightness of LED is followed the trail of, simultaneously also can adopt the cheap LED of price just can reach required effect, thereby solved circuit complexity in the conventional art, the problem that cost is high; Again because of give a pulse high level that LED is opened when the initial moment in the one-period of the pulse power, then the brightness of LED reaches the brightest, when in one-period near giving a pulse high level that LED is opened zero point constantly, then the brightness of LED is the most weak, at last utilize controllable silicon to automatically shut down constantly at the zero point of the pulse power, along with LED open-interval in one-period is postponed, then LED by the brightest to the most weak, extinguish at last, the overall process of control is exactly by between one-period and another cycle or regulate the light of LED, the brightness of LED therebetween changes comparatively mild, light is comparatively soft, thereby reach good dimming effect, be easy to produce dreamscape, realize dreamlike effect.
Description of drawings
Fig. 1 is circuit theory diagrams of the present utility model;
Fig. 2 is the control signal waveform schematic diagram of the utility model control LED brightness.
Embodiment
Below in conjunction with accompanying drawing, the utility model is further described:
With reference to Fig. 1, the utility model is a kind of device of the LED of control brightness, comprise city's power supply transformer, bridge rectifier, driving load, main control chip, storage chip and zero cross detection circuit, insert city's power supply 21, alternating current is connected with the input of bridge rectifier 3 behind fuse 20, city's power supply transformer 1 output voltage terminal filter capacitor 2 in parallel, constitutes to drive the required DC power supply of led light source in the load 4; Again with LED be connected in DC power supply after controllable silicon 14 and resistance 12 are connected, wherein controllable silicon is an one-way SCR; Then silicon controlled is controlled the utmost point and be connected with the collector electrode of transistor 13, and be connected on the main control chip 6 behind the resistance 11 of connecting, this main control chip is a singlechip chip EM78P153SN; DC power supply constitutes for storage chip 9, main control chip and the required D.C. regulated power supply of zero cross detection circuit 7 work through a voltage stabilizing didoe 19; One by-pass cock 8 is composed in parallel by mode switch 81 and speed switch 82, one end ground connection, and the other end connects two different pins on the main control chip respectively; One storage chip 9, one end ground connection, another termination main control chip; Be connected to a zero cross detection circuit between city's power supply and main control chip, this circuit is to be made of 71,72 parallel connections of two photoelectrical couplers.
Fig. 2 is the control signal oscillogram of the utility model control LED brightness, this control signal can be the pulse power, it also can be AC power, preferred pulse power supply among this embodiment, when city's power supply 21 through filter capacitor 2, behind the bridge rectifier 1, the alternating current of all-wave is made into half-wave pulse DC power supply 23 directly to be added on the LED, as the required DC power supply of led light source, and utilize controllable silicon 14 to control LED to automatically shut down constantly at the zero point of the pulse power by zero-crossing switching, utilize main control chip 6 to send trigger impulse level 24 simultaneously in good time and control LED opening time of (0-t1) in a pulse period, reach control LED is in " bright " state in one-period time and bright-dark degree with this, owing to adopt the pulse power to come lighting of driving LED, its power supply signal changes comparatively mild, the light that LED sends is soft, and the brightness of adopting this kind method to regulate LED can produce fantasy effect.
Above illustrated embodiment only with convenient explanation the utility model, is not breaking away from creation spirit scope of the present utility model, is familiar with any simple covert and modification that the personage did of this technology, must be contained in the rights protection scope of the present utility model.
Claims (7)
1. device of controlling LED brightness, comprise city's power supply transformer, bridge rectifier, driving load, main control chip, storage chip and zero cross detection circuit, it is characterized in that: described city's power supply transformer (1) output voltage terminal filter capacitor in parallel (2) back connects and composes the DC power supply that drives led light source in the load (4) with bridge rectifier (3); Described LED be connected in DC power supply after controllable silicon (14) and resistance (12) are connected; After controlling the utmost point and transistor (13) and resistance (11) are connected, described silicon controlled is connected on the main control chip (6); Described storage chip (9) and by-pass cock (8) are connected on the main control chip respectively; Described zero cross detection circuit (7) is connected between main control chip and the city's power supply (21), is connected to the power supply (5) for main control chip, storage chip and zero cross detection circuit work between main control chip and zero cross detection circuit.
2. the device of control LED according to claim 1 brightness, it is characterized in that: described controllable silicon (14) is an one-way SCR.
3. according to the device of the described control of claim 1 LED brightness, it is characterized in that: described main control chip (6) is a singlechip chip EM78P153SN.
4. according to the device of the described control of claim 1 LED brightness, it is characterized in that: an end ground connection of described storage chip (9), another termination main control chip.
5. according to the device of the described control of claim 1 LED brightness, it is characterized in that: described by-pass cock (8) is composed in parallel by mode switch (81) and speed switch (82), and an end ground connection, and the other end connects two different pins on the main control chip respectively.
6. according to the device of the described control of claim 1 LED brightness, it is characterized in that: described zero cross detection circuit (7) is to be composed in parallel by two photoelectrical couplers (71), (72).
7. according to the device of claim 1 or 3 or 4 or 6 described control LED brightness, it is characterized in that: the described power supply (5) of powering for main control chip, storage chip and zero cross detection circuit is a D.C. regulated power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620061394 CN200966175Y (en) | 2006-07-06 | 2006-07-06 | A device for controlling the brightness of LED |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620061394 CN200966175Y (en) | 2006-07-06 | 2006-07-06 | A device for controlling the brightness of LED |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN200966175Y true CN200966175Y (en) | 2007-10-24 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200620061394 Expired - Fee Related CN200966175Y (en) | 2006-07-06 | 2006-07-06 | A device for controlling the brightness of LED |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN200966175Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017000381A1 (en) * | 2015-07-01 | 2017-01-05 | 上海顿格电子贸易有限公司 | Drive circuit and lighting device of led lamp |
| CN112444963A (en) * | 2019-08-30 | 2021-03-05 | 成都理想境界科技有限公司 | Light source driving circuit and display module |
-
2006
- 2006-07-06 CN CN 200620061394 patent/CN200966175Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017000381A1 (en) * | 2015-07-01 | 2017-01-05 | 上海顿格电子贸易有限公司 | Drive circuit and lighting device of led lamp |
| CN112444963A (en) * | 2019-08-30 | 2021-03-05 | 成都理想境界科技有限公司 | Light source driving circuit and display module |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20071024 |