CN100484347C - Method for driving LED brightness - Google Patents
Method for driving LED brightness Download PDFInfo
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- CN100484347C CN100484347C CNB2007100271836A CN200710027183A CN100484347C CN 100484347 C CN100484347 C CN 100484347C CN B2007100271836 A CNB2007100271836 A CN B2007100271836A CN 200710027183 A CN200710027183 A CN 200710027183A CN 100484347 C CN100484347 C CN 100484347C
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Abstract
The method comprises: using the serial communication port of an external single-chip to output serial data; the serial data is transmitted to a serial input port of a reception and conversion chip, and is decoded and outputted at its parallel output port; the signals outputted from the parallel output port drives a current sampling circuit to generate a corresponding current value; making the weighting for the current value; after amplified by an amplifier circuit, the current drives the LED in the load current to light or change its light.
Description
Affiliated technical field
The present invention relates to a kind of circuit and method of driven for emitting lights diode, especially relate to and a kind ofly flow through the size of current of light-emitting diode two pins end, the lighting and method that brightness changes of driven for emitting lights diode by change.
Background technology
In recent years, have environmental protection, a light-emitting diode of advantages such as volume is little, power consumption is few, long service life, be widely used in illumination and decorative lamp field.Along with the development of led technology, the light-emitting diode that power does not wait is also come out one after another, and as the first-selected product in the illumination and the field of decoration, its luminosity is having a strong impact on quality and the development in future direction and the living space of product.
At present, the method of the more control light-emitting diode luminance of Chu Xianing mainly is to adopt the PWM technology on the market, it 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 or whole string light-emitting diode, but its weak point is: owing to utilize rectangular pulse to come the driven for emitting lights diode, add a 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; At high level to low level, brightness again from the brightest to extinguishing, the brightness amplitude of variation of its light-emitting diode is bigger, therefore make that the brightness effect of light-emitting diode is poor, luminous utilance is not high, and brightness is subjected to certain restriction, is difficult to realize required slowly continuous variation effect.
In addition, adopt PWM technology driven for emitting lights diode, the power utilization rate is not high.Because the forward voltage drop of light-emitting diode has certain discreteness, for the brightness that makes each pixel reaches consistent, it is used as the electric current adjustment to connect current-limiting resistance or other element in circuit in addition, and these resistance and element must use the IC chip controls.Therefore, consumed certain power, so not only wasted the energy, but also can produce certain heat, made the reliability of circuit can not get guaranteeing circuit; And the brightness of light-emitting diode changes also needs pointwise to adjust the parameter of each control section, very inconvenience.
In sum, can better be applied in order to make light-emitting diode, the brightness problem of self certainly will will better be solved.
Summary of the invention
There is mirror therewith, the objective of the invention is in order to solve the above-mentioned problem that proposes, a kind of size of current that flows through light-emitting diode by change is provided, lighting and the brightness variation of driven for emitting lights diode realized the method that brightness changes evenly, regulates a kind of driven for emitting lights LED lightness easy to use.
To achieve these goals, the technical solution adopted in the present invention is a kind of method of driven for emitting lights LED lightness, it is characterized in that: the serial data communication mouth that utilizes external microcontroller, export its serial data, and this serial data is delivered to one accept on the serial input port line of conversion chip, export by decoding and on it accepts the parallel delivery outlet line of conversion chip, be somebody's turn to do the signal of exporting on the parallel delivery outlet line and act on a current sampling circuit, and the corresponding current value of generation, with the current value weighting that produces, through the processing and amplifying of amplifying circuit, with lighting and the brightness variation of light emitting diode bulb in the driving load circuit.
The above-mentioned conversion chip of accepting is that one 8 Bits Serial is imported the also shift register of line output.
Above-mentioned current sampling circuit is made up of at least one single resistor network circuit.
Above-mentioned single resistor network circuit is made up of resistance and transistor, and wherein, used transistor is a PNP transistor, and this transistorized emitter is electrically connected with power supply; Base stage is electrically connected with an end of a resistance, and parallel port line corresponding on the other end of this resistance and the main control chip is connected; Collector electrode is electrically connected with a resistance, and the other end of this resistance is connected with amplifying circuit.
In above-mentioned two or more single resistor network circuit, the resistance that is electrically connected with transistor collector in the back single resistor network circuit is the twice of the resistance that is electrically connected with transistor collector in previous single resistor network circuit.
The method of above-mentioned driven for emitting lights LED lightness also comprises: by the data communication mouth of external circuit, the output control signal directly acts on current sampling circuit, and produce corresponding current value, with the current value weighting that produces, through the processing and amplifying of current amplification circuit, light emitting diode bulb lights and the brightness variation in the driving load circuit.
The present invention compared with prior art its beneficial effect is: because the present invention adopts analog form, change the mode that flows through the light emitting diode bulb electric current and regulate its brightness variation, broken through traditional employing PWM technology, be the pulse width modulation method, the brightness of regulating its light-emitting diode changes the brightness that is brought and changes inhomogeneous, shortcomings such as the power utilization rate is not high, circuit reliability is poor, use adjusting inconvenience; The used control chip of the present invention simultaneously is less; and need not to be provided with in addition overvoltage and current foldback circuit; make circuit structure simple; regulate easy, easy to use, circuit reliability is higher; as a kind of method of regulating the light-emitting diode luminance variation; preferred this technology, and have immeasurable market prospects and practical value.
Description of drawings
Fig. 1 is a circuit block diagram of the present invention;
Fig. 2 is circuit theory diagrams of the present invention.
Embodiment
For the function and benefit of further understanding circuit structure feature of the present invention in depth and can reach, now enumerate specific embodiment, and detailed introduction of conjunction with figs. is described as follows:
A kind of method of driven for emitting lights LED lightness; as shown in Figure 1; what this driving method adopted is a kind of drive circuit; this circuit comprises the external circuit 1 that is sent serial data signal by single-chip microcomputer; receive the serial input data signal and convert the reception conversion chip 2 of parallel output data signal to; receive the current sampling circuit 3 of parallel output data signal and generation corresponding current value; the electric current of current sampling circuit 3 collections is carried out the current amplification circuit 4 of processing and amplifying; the load circuit 5 of received current amplifying circuit 4 output amplified currents; be connected the socket 6 that receives between conversion chip 2 and the load circuit 5, and with current amplification circuit 4; load circuit 5 is connected; and prevent the protective circuit 7 and 8 of noise and electromagnetic interference.
With reference to Fig. 2, this figure is circuit theory diagrams of the present invention.Schematic diagram in a circuit according to the invention, a kind of specific embodiment is: 1W is carried out timesharing control with interior RGB light emitting diode bulb.1W is connected electrically in respectively on plug P1, P2 and the P3 with interior RGB light emitting diode bulb or the lamp string of being made up of with interior RGB light emitting diode bulb 1W.Utilize the single-chip microcomputer serial data communication mouth in the external circuit 1, export its serial data, and this serial data is delivered to one accept on the serial input port line of conversion chip 2, export by decoding and on it accepts the parallel delivery outlet line of conversion chip 2.Simultaneously by single-chip microcomputer serial data communication mouth, output serial data and clock signal, drive the control RGB light emitting diode bulb or the circuit of lamp string in the load circuits 5 by socket 6, and the time is lighted at the light emitting diode bulb of various different colours or the interval of lamp string.The data-signal of exporting from the parallel delivery outlet line of accepting conversion chip 2 acts on a current sampling circuit 3, and this current sampling circuit 3 is made up of at least one single resistor network circuit 21; Described single resistor network circuit 21 is made up of two resistance and a transistor, and wherein, used transistor is a PNP transistor, and this transistorized emitter is electrically connected with power supply; Base stage is electrically connected with an end of a resistance, the other end of this resistance with receive conversion chip 2 on corresponding parallel port line be connected; Collector electrode is electrically connected with a resistance, and the other end of this resistance is connected with current amplification circuit 4.And in two or more single resistor network circuit of circuit structure as hereinbefore, the resistance that is electrically connected with transistor collector in the back single resistor network circuit is the twice of the resistance that is electrically connected with transistor collector in previous single resistor network circuit.Produce corresponding current value by current sampling circuit 3, and each current value weighting that will produce, after the processing and amplifying of current amplification circuit 4, export to light emitting diode bulb or lamp string in the load circuit 5, cooperate clock signal that each different color LEDs bulb or lamp string are lighted the control of time again, thereby can drive 1W lighting and the even variation of brightness with interior RGB light emitting diode bulb or lamp string.
Schematic diagram in a circuit according to the invention, another kind of specific embodiment is: the light emitting diode bulb or the brightness of lamp string of control 3W change.Need not load circuit 5 is carried out the timesharing setting this moment, directly is the light emitting diode bulb of 3W with power or is that lamp string that the light emitting diode bulb of 3W is formed is connected on the plug P4 and gets final product by power.Other driving is the same with the method for interior light emitting diode bulb with regulating 1W with control method, no longer describes in detail herein.
In sum, the invention provides a kind of method of driven for emitting lights LED lightness, through actual fabrication, finish and test repeatedly after, reached the desired purpose of the present invention, solved existing weak point in the prior art effectively.Yet, more than the specific embodiment of lifting only be that technical characterictic of the present invention and technology contents are described in further detail, shown in accompanying drawing only for reference with the explanation usefulness, be not to be used for the present invention is limited.
Claims (6)
1, a kind of method of driven for emitting lights LED lightness, it is characterized in that: the serial data communication mouth that utilizes external microcontroller, export its serial data, and this serial data is delivered to one accept on the serial input port line of conversion chip, export by decoding and on it accepts the parallel delivery outlet line of conversion chip, be somebody's turn to do the signal of exporting on the parallel delivery outlet line and act on a current sampling circuit, and the corresponding current value of generation, with the current value weighting that produces, through the processing and amplifying of amplifying circuit, with lighting and the brightness variation of light emitting diode bulb in the driving load circuit.
2, the method for driven for emitting lights LED lightness according to claim 1 is characterized in that: the above-mentioned conversion chip of accepting is that one 8 Bits Serial is imported the also shift register of line output.
3, the method for driven for emitting lights LED lightness according to claim 1 is characterized in that: above-mentioned current sampling circuit is made up of at least one single resistor network circuit.
4, the method for driven for emitting lights LED lightness according to claim 3, it is characterized in that: above-mentioned single resistor network circuit is made up of resistance and transistor, wherein, used transistor is a PNP transistor, and this transistorized emitter is electrically connected with power supply; Base stage is electrically connected with an end of a resistance, and parallel port line corresponding on the other end of this resistance and the main control chip is connected; Collector electrode is electrically connected with a resistance, and the other end of this resistance is connected with amplifying circuit.
5, the method for driven for emitting lights LED lightness according to claim 4, it is characterized in that: in above-mentioned two or more single resistor network circuit, the resistance that is electrically connected with transistor collector in the back single resistor network circuit is the twice of the resistance that is electrically connected with transistor collector in previous single resistor network circuit.
6, the method for driven for emitting lights LED lightness according to claim 1, it is characterized in that: the method for above-mentioned driven for emitting lights LED lightness also comprises: by the data communication mouth of external circuit, the output control signal directly acts on current sampling circuit, and produce corresponding current value, with the current value weighting that produces, through the processing and amplifying of current amplification circuit, light emitting diode bulb lights and the brightness variation in the driving load circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100271836A CN100484347C (en) | 2007-03-15 | 2007-03-15 | Method for driving LED brightness |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100271836A CN100484347C (en) | 2007-03-15 | 2007-03-15 | Method for driving LED brightness |
Publications (2)
| Publication Number | Publication Date |
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| CN101052255A CN101052255A (en) | 2007-10-10 |
| CN100484347C true CN100484347C (en) | 2009-04-29 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB2007100271836A Expired - Fee Related CN100484347C (en) | 2007-03-15 | 2007-03-15 | Method for driving LED brightness |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101772240A (en) * | 2009-01-07 | 2010-07-07 | 深圳富泰宏精密工业有限公司 | Inductive lighting device |
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Granted publication date: 20090429 Termination date: 20130315 |