CN101932158B - Led circuit - Google Patents
Led circuit Download PDFInfo
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- CN101932158B CN101932158B CN 201010255414 CN201010255414A CN101932158B CN 101932158 B CN101932158 B CN 101932158B CN 201010255414 CN201010255414 CN 201010255414 CN 201010255414 A CN201010255414 A CN 201010255414A CN 101932158 B CN101932158 B CN 101932158B
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- 230000005669 field effect Effects 0.000 claims description 8
- 238000001914 filtration Methods 0.000 claims description 4
- 239000003990 capacitor Substances 0.000 abstract description 9
- 230000000694 effects Effects 0.000 abstract description 8
- 230000001174 ascending effect Effects 0.000 abstract 1
- 230000033228 biological regulation Effects 0.000 description 5
- 239000004065 semiconductor Substances 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 3
- 230000007423 decrease Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000002860 competitive effect Effects 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 230000035876 healing Effects 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
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Abstract
The invention discloses an LED circuit, which has a multi-layer circuit board structure. The LED circuit comprises an output layer, a ground layer and at least one signal wire layer arranged between the ground layer and the output layer, wherein the output layer comprises a power supply circuit and an LED driving circuit; the power supply circuit is used for providing a working voltage for the LED driving circuit and a subcircuit LED light-emitting circuit; the LED driving circuit is used for controlling a pulse width modulation signals for outputting different duty ratios to LEDs; the power supply circuit improves the ascending waveform and descending waveform of an output current through a voltage-stabilizing capacitor and inhibits current surges from generating. In the LED circuit of the invention, a voltage-stabilizing capacitor is arranged at each of the power-supply end VLED of the LED light-emitting circuit and the power-supply end VDD of the LED driving circuit and an RC integrating circuit is arranged at each of the LE end, the CLK end and the OE end of the LED driving chip to prevent the surges from occurring, so the LED light-emitting circuit is protected, and the display effect of an LED display screen is improved.
Description
Technical field
The present invention relates to the LED field, relate in particular to a kind of led circuit.
Background technology
LED display uses more and more extensive, can see its application in places such as financial instrument, competitive sports, traffic message, advertisement delivery, video display amusements, simultaneously since recent years the LED cost descend and the lifting of brightness and LED display itself have that little power consumption, life-span are long, the visual angle reaches greatly fast response time, and can be according to the advantage of the customized corresponding size of different location and demand, emerge into fast the communications media favorite of a new generation on market, its condition especially other large-scale display devices is incomparable.Given this, how to improve the starting point that the LED display picture quality level has become current numerous producer to make great efforts by various technological means.
LED is driven by electric current, and the pulse duration of electric current can be controlled brightness and the shade of gray of LED.Shade of gray is exactly the resolution of each LEDs brightness on the display screen, and for instance, the 4bit shade of gray represents that LED has the brightness on 16 rank to change.The shade of gray of LED brightness can be controlled by the OE width that drives on the chip, and different OE width can obtain different LED shade of gray, also will demonstrate different LED brightness and change.In addition, the unit width of OE is shorter, and the cycle of finishing a shade of gray variation is also just short, and in the namely unit interval, the getable refresh rate of institute is also just high.The OE pulsewidth that heals little, the high output levels of just can output healing namely has more fast output current response, and refresh rate and output shade of gray are also just high.Can promote color range and the picture refreshing rate of output, high output levels then provides more colourful LED display image display effect, and high refresh rate provides the picture result of broadcast of the smooth flicker free of LED display.
Yet, less OE pulse duration needs rise/fall time (tr/tf) faster to keep the integrality of pulse duration, formula DV=L*di/dt(DV according to inductive effect is the surge voltage that stray inductance produces, L is stray inductance sense value, di/dt is the current changing rate that switches moment), t diminishes because of the time, the voltage of moment becomes the large surging that produces easily comparatively speaking, this abrupt voltage wave is produced by the stray inductance between VLED and the OUTn, not only may breakdown driven the delivery channel of chip, cause the damage of chip, also so that the phenomenon of whole LED display Electromagnetic Interference becomes seriously, display screen picture can produce the damage of shake or even system.
Summary of the invention
The technical problem that the present invention mainly solves provides a kind of led circuit that can prevent surging.
For solving the problems of the technologies described above, the technical scheme that the present invention adopts is: a kind of led circuit is provided, is connected with at least one paths of LEDs illuminating circuit, described led circuit is Multi-layer circuit board structure, described comprising:
Output layer, ground plane, at least one signal line layer that between ground plane and output layer, arranges, described output layer comprises power circuit and led drive circuit;
Described power circuit is used for providing operating voltage to described led drive circuit and at least one paths of LEDs illuminating circuit, described power circuit comprises power supply chip, and described power supply chip comprises earth terminal, led drive circuit feeder ear and LED illuminating circuit feeder ear;
Described led drive circuit is used for the pulse-width signal that the LED different duty is exported in control, and described led drive circuit comprises the driving chip, and described driving chip comprises LE end, CLK end, OE end, voltage input end and a plurality of LED signal output pin;
LE end, CLK end, OE end that described LED drives chip respectively arrange a RC integrating circuit;
Joint after voltage input end on led drive circuit feeder ear on the described power supply chip and the described LED driving chip is electrically connected is by the first capacity earth, and described LED illuminating circuit feeder ear is by the second capacity earth;
LED illuminating circuit feeder ear on the described power supply chip is connected with the LED illuminating circuit by inductance, and described inductance is used for filtering, and a plurality of LED signal output pins on the described driving chip all are electrically connected by divider resistance and LED illuminating circuit.
Wherein, also comprise the LE end, CLK end and the OE end that are arranged at respectively described driving chip for reducing the filter circuit of the peak value of the frequency of input signal.
Wherein, described filter circuit is the RC integrating circuit, and the resistance value of described integrating circuit is all less than 22 Ω, and capacitance is all less than 33pF.
Wherein, stacked first signal line layer and the secondary signal line layer of being provided with between described ground plane and the output layer.
Wherein, also be provided with a switching circuit on described led circuit, described switching circuit is used for the break-make of control different branch LED illuminating circuit.
Described switching circuit comprises field effect transistor, and the grid of described field effect transistor is electrically connected by resistance and the output that drives chip, and the source electrode of described field effect transistor directly is connected with the LED illuminating circuit, and the drain electrode of described field effect transistor directly is connected with the driving chip.
Wherein, described driving chip is 16 LED constant-current driven chip.
Wherein, described driving chip is that model is MBI5042, ZQ9726 or SMT5026.
Wherein, the capacitance size of described the second electric capacity is 1000～1500mF.
Wherein, the capacitance size of described the first electric capacity is 0.075～0.125uF.
Led circuit of the present invention passes through at LED illuminating circuit feeder ear V
LEDWith led drive circuit feeder ear V
DDRespectively by electric capacity of voltage regulation ground connection, and at LE end, CLK end, the OE end of LED driving chip the generation that one RC integrating circuit prevents surging is set respectively, has protected the LED illuminating circuit, improve the display effect of LED display; Circuit is simple simultaneously, and cost is low.
Description of drawings
Fig. 1 is the decomposing schematic representation of the circuit board of led circuit of the present invention;
Fig. 2 is the theory diagram of led circuit of the present invention;
Fig. 3 is the principle schematic of the output layer of led circuit of the present invention.
Embodiment
By describing technology contents of the present invention, structural feature in detail, realized purpose and effect, below in conjunction with execution mode and cooperate that accompanying drawing is detailed to give explanation.
By shown in Figure 1, decomposing schematic representation for the circuit board of led circuit 10 of the present invention, as seen from the figure, led circuit 10 of the present invention, be the four-layer circuit board structure, this four-layer circuit board structure comprises the output layer 11 that stacks gradually setting, first signal line layer 12, secondary signal line layer 13 and ground plane 14, this output layer 11 and this ground plane 14 are located at the insulation board outer surface, this first signal line layer 12 and secondary signal line layer 13 are combined in the insulation board, this output layer 11 is used for providing required electric current to LED illuminating circuit (not shown), this first signal line layer 12 and this secondary signal line layer 13 are used for exporting corresponding signal to output layer 11, this ground plane 14 is used for ground connection, derived current.Owing between output layer 11 and ground plane 14, be provided with first signal line layer 12 and this secondary signal line layer 13, make output layer 11 and ground plane 14 spaced apart, the design of this kind structure can reduce the stray inductance that is produced by output layer 11 and ground plane 14.
As shown in Figure 2, be the theory diagram of led circuit of the present invention, this output layer 11 comprises a power circuit 40, a led drive circuit 50, is electrically connected at switching circuit and RC integrating circuit on this led drive circuit 50; This power circuit 40 is used for providing operating voltage to led drive circuit 50 and at least one paths of LEDs illuminating circuit 80; This led drive circuit 50 is used for the pulse-width signal that the LED different duty is exported in control; The break-make that this switching circuit 70 is used for control different branch LED illuminating circuit 80 realizes the LED scan function; This RC integrating circuit 60 is used for digital filtering, excludes the interference signal.
Please consult together Fig. 2 and Fig. 3, this power circuit 40 is power supply chip (Power IC), and this Power IC comprises an earth terminal, a led drive circuit feeder ear VDD, and a LED illuminating circuit feeder ear V
LED, this led drive circuit feeder ear VDD is by the first electric capacity (decoupling capacitor CP1) ground connection, and this decoupling capacitor CP1 has the effect of three aspects: the one, as the energy storage capacitor of this integrated circuit; The 2nd, the high-frequency noise that this device of filtering produces cuts off the path that high-frequency noise is propagated by current supply circuit; The 3rd, prevent that the noise that power supply carries consists of interference to circuit, improve Power IC and export to the Current rise of LED driving chip (Driver IC) and the waveform of decline, waveform is become gently, reduce surging LED is driven the impact that chip causes; The capacitance of decoupling capacitor CP1 is in 0.075～0.125uF scope, and the representative value of distributed inductance is 5uH, and its parallel resonant frequency is about 7MHz, for the noise below the 10MHz preferably decoupling effect is arranged.This led drive circuit 50 feeder ear VDD also drive the voltage input end VDD ' electric connection of chip with LED, being used for driving chip to LED provides operating voltage; This LED illuminating circuit feeder ear V
LEDBy the second electric capacity (electric capacity of voltage regulation CP2) ground connection, the capacitance size of electric capacity of voltage regulation CP2 is in 1000～1500mF scope, this electric capacity of voltage regulation CP2 is used for improving Power IC and exports to the Current rise of LED illuminating circuit 80 and the waveform of decline, make waveform become mild, reduce surging to the impact of LED illuminating circuit 80, this LED illuminating circuit 80 feeder ear V
LEDAlso be electrical connected by an inductance L and each paths of LEDs illuminating circuit 80, a paths of LEDs illuminating circuit 80 only is shown in this preferred embodiment.
This led drive circuit 50 drives chip (Driver IC) for LED, this LED drives chip (Driver IC) and is provided with the LE end, the CLK end, the OE end, led drive circuit feeder ear and a plurality of LED signal output pin, this LE end is used for latch data, namely when the data of input disappear, output at chip, data still keep, this CLK end is used for the receive clock pulse signal, this OE end is used for the output enable pulse signal, this LED drives the feeder ear VDD electric connection of voltage input end VDD ' with the Power IC of chip, be used for receiving the operating voltage that Power IC transmission comes, link to each other with a paths of LEDs illuminating circuit 80 by a divider resistance RL1 at LED signal output pin OUT1 place, link to each other these a plurality of divider resistance (RL1 at LED signal output pin OUT2 place with another paths of LEDs illuminating circuit 80 by a divider resistance RL2, RL2,) be used for the inductance L dividing potential drop.
When OE was 0, effective for high level, at this moment its output neither one was in effective operating state, and this LED drives chip and do not work; When OE was 1, this LED drove chip and can work, and output is under effective operating state.
This LED driving chip is 16 LED constant-current driven chip, and can select model is the LED constant-current driven chip of MBI5042, ZQ9726 or SMT5026.
The OE end that drives chip at above-mentioned LED connects a RC integrating circuit 61, peak value for reducing the frequency of input signal, prevent the generation of surging, the capacitor C i1 one termination OE end other end ground connection of this RC integrating circuit 61, the resistance R i1 one termination OE of this RC integrating circuit 61 holds another termination signal input part 90; Connect a RC integrating circuit 62 at the CLK end, the capacitor C i2 one termination CLK end other end ground connection of this RC integrating circuit 62, the resistance R i2 one termination CLK of this RC integrating circuit 62 holds another termination signal input part 90; Respectively connect a RC integrating circuit 63 at the LE end, the capacitor C i3 one termination LE end other end ground connection of this RC integrating circuit 63, the resistance R i3 one termination LE of this RC integrating circuit 63 holds another termination signal input part 90; Can cause supply variation to increase because the variation of color is abundant during the LED screen work, the IC input also is to be vulnerable to impact the place most, the existence of resistance (Ri1, Ri2, Ri3) can reduce the crest that voltage fluctuation brings, and also can improve the filter effect of electric capacity (Ci1, Ci2, Ci3) simultaneously.
The size of the resistance of above-mentioned integrating circuit is all less than 22 Ω, and the size of electric capacity is all less than 33pF.
Led drive circuit 50 of the present invention passes through at LED illuminating circuit 80 feeder ear V
LEDWith led drive circuit 50 feeder ear V
DDElectric capacity of voltage regulation is set, and holds at LE end, the CLK of LED driving chip, the OE end respectively arranges the generation that a RC integrating circuit 60 prevents surging, has protected LED illuminating circuit 80, improves the display effect of LED display.
The above only is embodiments of the invention; be not so limit claim of the present invention; every equivalent structure or equivalent flow process conversion that utilizes specification of the present invention and accompanying drawing content to do; or directly or indirectly be used in other relevant technical fields, all in like manner be included in the scope of patent protection of the present invention.
Claims (10)
1. a led circuit is connected with at least one paths of LEDs illuminating circuit, and described led circuit is Multi-layer circuit board structure, and described led circuit comprises:
Output layer, ground plane, at least one signal line layer that between ground plane and output layer, arranges, described output layer comprises power circuit and led drive circuit;
Described power circuit is used for providing operating voltage to described led drive circuit and at least one paths of LEDs illuminating circuit, described power circuit comprises power supply chip, and described power supply chip comprises earth terminal, led drive circuit feeder ear and LED illuminating circuit feeder ear;
Described led drive circuit is used for the pulse-width signal that the LED different duty is exported in control, and described led drive circuit comprises the driving chip, and described driving chip comprises LE end, CLK end, OE end, voltage input end and a plurality of LED signal output pin;
It is characterized in that:
LE end, CLK end, OE end that described LED drives chip respectively arrange a RC integrating circuit;
Joint after voltage input end on led drive circuit feeder ear on the described power supply chip and the described LED driving chip is electrically connected is by the first capacity earth, and described LED illuminating circuit feeder ear is by the second capacity earth;
LED illuminating circuit feeder ear on the described power supply chip is connected with the LED illuminating circuit by inductance, and described inductance is used for filtering, and a plurality of LED signal output pins on the described driving chip all are electrically connected by divider resistance and LED illuminating circuit.
2. led circuit according to claim 1 is characterized in that: comprise that also the LE end, CLK end and the OE end that are arranged at respectively described driving chip is for reducing the filter circuit of the peak value of the frequency of input signal.
3. led circuit according to claim 2, it is characterized in that: described filter circuit is the RC integrating circuit, and the resistance value of described integrating circuit is all less than 22 Ω, capacitance is all less than 33pF.
4. led circuit according to claim 1 is characterized in that: be provided with stacked first signal line layer and secondary signal line layer between described ground plane and the output layer.
5. led circuit according to claim 1 is characterized in that: also be provided with switching circuit on described led circuit, described switching circuit is used for the break-make of control different branch LED illuminating circuit.
6. led circuit according to claim 5, it is characterized in that: described switching circuit comprises field effect transistor, the grid of described field effect transistor is electrically connected by resistance and the output that drives chip, the source electrode of described field effect transistor directly is connected with the LED illuminating circuit, and the drain electrode of described field effect transistor directly is connected with the driving chip.
7. led circuit according to claim 1, it is characterized in that: described driving chip is 16 LED constant-current driven chip.
8. led circuit according to claim 7, it is characterized in that: described driving chip is that model is MBI5042, ZQ9726 or SMT5026.
9. led circuit according to claim 1, it is characterized in that: the capacitance size of described the second electric capacity is 1000～1500mF.
10. led circuit according to claim 1, it is characterized in that: the capacitance size of described the first electric capacity is 0.075～0.125uF.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010255414 CN101932158B (en) | 2010-08-17 | 2010-08-17 | Led circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010255414 CN101932158B (en) | 2010-08-17 | 2010-08-17 | Led circuit |
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| Publication Number | Publication Date |
|---|---|
| CN101932158A CN101932158A (en) | 2010-12-29 |
| CN101932158B true CN101932158B (en) | 2013-01-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201010255414 Expired - Fee Related CN101932158B (en) | 2010-08-17 | 2010-08-17 | Led circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020172961A1 (en) * | 2019-02-25 | 2020-09-03 | 深圳市华星光电半导体显示技术有限公司 | Power supply circuit |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104052250A (en) * | 2013-03-11 | 2014-09-17 | 深圳市海洋王照明工程有限公司 | Electromagnetic sound filter circuit and DC air fan |
| CN105163427A (en) * | 2015-08-23 | 2015-12-16 | 合肥艾斯克光电科技有限责任公司 | Light-emitting diode (LED) integrated control circuit |
| CN105405391A (en) * | 2015-11-20 | 2016-03-16 | 芜湖锐芯电子科技有限公司 | Voltage stabilization and recognition LED circuit |
| CN105451389A (en) * | 2015-11-20 | 2016-03-30 | 芜湖锐芯电子科技有限公司 | LED lamp light-emitting module |
| CN109743509B (en) * | 2019-01-15 | 2021-01-05 | 上海曼恒数字技术股份有限公司 | Method and device for supplementing light for camera |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101711069A (en) * | 2009-07-21 | 2010-05-19 | 海洋王照明科技股份有限公司 | LED driving power supply circuit |
| CN101754513A (en) * | 2008-12-03 | 2010-06-23 | 德信科技股份有限公司 | Controllable soft start and soft shut-off circuit with pulse width modulation function |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4564363B2 (en) * | 2005-01-13 | 2010-10-20 | パナソニック株式会社 | LED driving semiconductor device and LED driving device |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101754513A (en) * | 2008-12-03 | 2010-06-23 | 德信科技股份有限公司 | Controllable soft start and soft shut-off circuit with pulse width modulation function |
| CN101711069A (en) * | 2009-07-21 | 2010-05-19 | 海洋王照明科技股份有限公司 | LED driving power supply circuit |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020172961A1 (en) * | 2019-02-25 | 2020-09-03 | 深圳市华星光电半导体显示技术有限公司 | Power supply circuit |
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| CN101932158A (en) | 2010-12-29 |
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