CN103025002B - Solar LED (light-emitting diode) lamp string drive circuit - Google Patents
Solar LED (light-emitting diode) lamp string drive circuit Download PDFInfo
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- CN103025002B CN103025002B CN201210500530.3A CN201210500530A CN103025002B CN 103025002 B CN103025002 B CN 103025002B CN 201210500530 A CN201210500530 A CN 201210500530A CN 103025002 B CN103025002 B CN 103025002B
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Abstract
The invention relates to a solar LED (light-emitting diode) lamp string drive circuit. The solar LED lamp string drive circuit comprises a solar photovoltaic plate, a charging battery and a control chip, wherein the control chip comprises an input end pin 2, an output end pin 3 and a power input end pin 4, wherein the output end pin 3 is connected with the charging battery through an inductor; the solar photovoltaic plate can charge the charging battery through a diode D, the output end pin 3 is also connected with the diode and a capacitor, and the positive pole of the capacitor is connected with the positive pole of an LED lamp string; the positive pole of the LED lamp string is connected with an oscillator, and the output end of the oscillator is connected with a base electrode of a PNP (precision navigation processor) through a resistor; and a collector electrode of the PNP is connected with the power input end pin 4, and an emitting electrode of the PNP is connected with the positive pole of the charging battery. The solar LED lamp string drive circuit provided by the invention can control whether the chip operates through the conduction and cut-off of a PNP switch triode, a flickering function of the LED lamp string is formed, as the voltage is directly loaded on the LED lamp string, the brightness of the LED lamp string is bright and electricity-saving, and meanwhile, a powerful protection function for the charging battery is obtained.
Description
Technical field
The present invention relates to a kind of LED drive circuit.
Background technology
The LED drive circuit of 8011 is used in prior art, realize its flashing function, driving voltage is loaded on oscillator and triode simultaneously, and oscillator signal is carried in the base stage of triode, realize its flashing function by the switch performance band dynamic load of triode, as shown in Figure 1, before this type of drive is loaded into LED by chip output voltage, need the control through triode, then voltage, power have to pass through the loss on triode, therefore the luminosity of LED can obviously reduce.In addition; circuit of the prior art is generally DC power supply be directly loaded on chip; rechargeable battery can normally work when more than 1V; but as electric below 1V; although chip has the effect of battery low-voltage variation; but because DC power supply is directly loaded on chip; therefore leakage current is not also enough little; battery drops to 0.9V from 1V can only keep 5-6 days time; then from 0.9V, cell voltage is accelerated to decline; and the battery accelerated after decline can have a significant impact its performance, the time is longer, affects larger.So need a kind of circuit can reduce leakage current further extend battery drops to 0.9V retention time from 1V, thus protect battery further.
Summary of the invention
In order to overcome the above-mentioned deficiency of prior art, the invention provides a kind of can larger raising LED string luminosity and the LED string drive circuit of rechargeable battery can be protected when LED string extinguishes better when glimmering.
The technical scheme that the present invention solves its technical problem is:
A kind of solar LED (Light Emitting Diode) lamp string drive circuit, comprise solar energy photovoltaic panel, rechargeable battery, and control chip, described control chip includes earth terminal 1 pin, connect input 2 pin of solar energy photovoltaic panel, connect output 3 pin of rechargeable battery and power input 4 pin for connecting DC power supply, whether described control chip exports high-frequency impulse by low and high level control output end 3 pin of input 2 pin, the starting resistor of described power input 4 pin is 1V, output 3 pin of described control chip is by the rechargeable battery described in an inductance connection, described solar energy photovoltaic panel is charged to rechargeable battery by diode D, described output 3 pin also connects a diode and electric capacity, the positive pole of described electric capacity connects the positive pole of LED string, the positive pole of described LED string also connects the power input of an oscillator, the output of described oscillator connects the base stage of a PNP switch triode by resistance, power input 4 pin of the collector electrode connection control chip of described PNP switch triode, the emitter of described PNP switch triode connects the positive pole of rechargeable battery.
As preferably, the positive pole of described LED string is also connected in parallel a voltage-stabiliser tube.
As preferably, between inductance with rechargeable battery, be also connected a switch.
The supply power voltage of the present invention to LED string is directly loaded on LED string by output 3 pin, what control chip output 3 pin exported is high-frequency impulse, to LED statements based on collusion electricity after rectification superposes with charged battery voltage, power input 4 pin of control chip is connected to the collector electrode of switch triode, the emitter of switch triode connects rechargeable battery positive pole, the output of the base stage connection oscillator of switch triode, then control control chip work by the break-make of switch triode or quit work, thus controlling the flicker of LED string.
When solar energy photovoltaic panel receives illumination, the input of control chip input 2 pin is high level, and control chip output 3 pin turns off, and LED string does not work, and solar energy photovoltaic panel is directly charged to rechargeable battery by diode D11.When solar energy photovoltaic panel does not receive illumination, the input of control chip input 2 pin is low level, and control chip output 3 pin exports high-frequency impulse.
Connect moment, oscillator output low level, PNP switch triode works, namely be operated in saturation condition, between emitter and collector electrode, pressure drop is very little, and the charged battery voltage added by emitter is about 1 ~ 1.4V, the input of power input 4 pin is greater than 1V, and LED string is lit instantaneously.When oscillator exports high level, switch triode disconnects and not working, namely in cut-off state, and now collector electrode output voltage ﹤ 1V, and the power input 4 pin starting resistor of control chip is 1V, then control chip stops exporting high-frequency impulse, and LED string extinguishes.But external oscillator is also in normal work, when oscillator output low level, control chip works again, and LED string is lighted.Export low and high level by oscillator and make the Kai Heguan of switch triode normal frequency, thus driven the Kai Heguan of control chip, then LED string presents the operating state of flicker, and this circuit is directly loaded on LED string due to voltage, and LED string is brighter.In addition, the more power saving of this circuit, due to LED string extinguish time, control chip is completely out-of-work, and compared in prior art, it is actual also in running order, saved electricity consumption, this is particularly important to the power supply of Solar lamp string.This circuit is also had to have more protective value to rechargeable battery; due to the setting of PNP switch triode; as power input 4 pin voltage ﹤ 1V; because switch triode seals in; then power input 4 pin of control chip is less than charged battery voltage, sealing in just because of switch triode, greatly reduces chip leakage current; the time of impelling the voltage of rechargeable battery to drop to 0.9V from 1V can significantly extend, thus enhances the function of protection battery.When LED string progresses into extinguishing, because the pressure drop of switch triode increases, make the voltage drop of power input 4 pin, cause chip leakage current to reduce, thus improve the protective value to rechargable battery, protected effect can bring up to more than 4 times.
Beneficial effect of the present invention is: the present invention by the conducting of PNP switch triode and cut-off thus control chip whether work; form the flashing function of LED string; because voltage is directly carried on LED string; so LED cross luma degree is brighter; also more power saving, and obtain the more strong defencive function of rechargeable battery simultaneously.
Accompanying drawing explanation
Fig. 1 is the electrical block diagram of prior art.
Fig. 2 is electrical block diagram of the present invention.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
As shown in Figure 1, a kind of solar LED (Light Emitting Diode) lamp string drive circuit, comprises solar energy photovoltaic panel 3, rechargeable battery 2, and 8011 control chips 4.8011 control chips include earth terminal 1 pin, connect input 2 pin of solar energy photovoltaic panel, connect output 3 pin of rechargeable battery and connect power input 4 pin of DC power supply by inductance.Whether 8011 control chips export high-frequency impulse by low and high level control output end 3 pin of input 2 pin, the starting resistor of output 4 pin is 1V, during the voltage >=1V of i.e. output 4 pin, 8011 control chips are started working, if input 2 pin input high level, then output 3 pin does not export high-frequency impulse, if input 2 pin input low level, then output 4 pin exports high-frequency impulse.Output 3 pin of 8011 control chips connects rechargeable battery 2 by an inductance 1, and switch 10 is also connected with between inductance 1 and rechargeable battery 2, solar energy photovoltaic panel 3 not only connects input 2 pin of 8011 control chips, also connect rechargeable battery 2 through diode D11, then can directly charge, rechargeable battery generally remains on about 1 ~ 1.4V.Output 3 pin also connects diode 5 and an electric capacity, and capacitance cathode connects the positive pole of LED string 6, and namely the input voltage of LED string is that output 3 pin exports superposing of high-frequency impulse and rechargeable battery, and the voltage that LED string is lighted is generally about 3V.The positive pole of LED string also connects the power input of an oscillator 9, the output of oscillator connects the base stage B of a PNP switch triode 7 by a resistance 8, power input 4 pin of the collector electrode C connection control chip of PNP switch triode, the emitter E of PNP switch triode connects the positive pole of rechargeable battery.The positive pole of LED string 6 is also connected in parallel a voltage-stabiliser tube.
The present invention is directly loaded on LED string to the supply power voltage of LED string by output 3 pin, what 8011 control chip output 3 pin outputs exported is high-frequency impulse, to act in collusion to make each other's confessions electricity to LED with after rechargeable battery 2 voltage superposition, power input 4 pin of control chip is connected to the collector electrode C of switch triode, the emitter of switch triode connects rechargeable battery positive pole, the output of the base stage B connection oscillator of switch triode, then control control chip work by the break-make of switch triode or quit work, thus controlling the flicker of LED string.
When solar energy photovoltaic panel receives illumination, 8011 control chip input 2 pin inputs are high level, and control chip output 3 pin turns off, and LED string does not work, and solar energy photovoltaic panel 3 is directly charged to rechargeable battery by diode D.When solar energy photovoltaic panel does not receive illumination, the input of control chip input 2 pin is low level, and control chip 3 pin exports high-frequency impulse.
Connect moment, oscillator output low level state, PNP switch triode works, the pressure drop of emitter and collector electrode is very little, rechargable battery voltage added by emitter is added to power input 4 pin by triode, when 4 pin voltages are greater than 1V, and control chip work, output 3 pin exports high-frequency impulse, and LED string is lit instantaneously.When oscillator exports high level, switch triode disconnects, now collector electrode output voltage ﹤ 1V, and the power input 4 pin starting resistor of control chip is 1V, then output 3 pin of control chip stops exporting high-frequency impulse, and LED string extinguishes.But oscillator still can normally work, then, during oscillator output low level, control chip works again, and LED string is lighted.Export low and high level by oscillator and make the Kai Heguan of switch triode normal frequency, thus driven the Kai Heguan of control chip, then LED string presents the operating state of flicker, and this circuit is directly loaded on LED string due to voltage, and LED string is brighter more stable.In addition, the more power saving of this circuit, due to LED string extinguish time, control chip is completely out-of-work, and compared in prior art, it is actual also in running order, saved electricity consumption, this is particularly important to the power supply of Solar lamp string.This circuit is also had to have more protective value to rechargeable battery; due to the setting of PNP switch triode; as power input 4 pin voltage ﹤ 1V; LED string goes out; due to the pressure drop that triode produces, make 4 pin voltages of control chip be less than cell voltage, then significantly can reduce the leakage current of control chip; the time enabling the voltage of rechargeable battery drop to 0.9V from 1V extends greatly, thus enhances the function of protection battery.When rechargeable battery is more near 1V, the conduction voltage drop of switch triode increases, and 4 pin voltages are lower, and when guard mode, the leakage current of 4 pin is less, thus strengthens protective value.The effect of protection can bring up to more than 4 times.
The present invention by the conducting of switch triode and cut-off thus control chip whether work; form the flashing function of LED string, because voltage is directly carried on LED string, so LED cross luma degree is brighter; also more power saving, and obtain the defencive function stronger to rechargeable battery simultaneously.
Claims (3)
1. a solar LED (Light Emitting Diode) lamp string drive circuit, comprise solar energy photovoltaic panel, rechargeable battery, and control chip, described control chip includes earth terminal 1 pin, connect input 2 pin of solar energy photovoltaic panel, connect output 3 pin of rechargeable battery and power input 4 pin for connecting DC power supply, whether described control chip exports high-frequency impulse by low and high level control output end 3 pin of input 2 pin, the starting resistor of described power input 4 pin is 1V, it is characterized in that: output 3 pin of described control chip is by the rechargeable battery described in an inductance connection, described solar energy photovoltaic panel is charged to rechargeable battery by diode D, described output 3 pin also connects a diode and electric capacity, the positive pole of described electric capacity connects the positive pole of LED string, the positive pole of described LED string also connects the power input of an oscillator, the output of described oscillator connects the base stage of a PNP switch triode by resistance, power input 4 pin of the collector electrode connection control chip of described PNP switch triode, the emitter of described PNP switch triode connects the positive pole of rechargeable battery.
2. a kind of solar LED (Light Emitting Diode) lamp string drive circuit according to claim 1, is characterized in that: the positive pole of described LED string is also connected in parallel a voltage-stabiliser tube.
3. a kind of solar LED (Light Emitting Diode) lamp string drive circuit according to claim 1 and 2, is characterized in that: described inductance is also connected a switch with between rechargeable battery.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210500530.3A CN103025002B (en) | 2012-11-30 | 2012-11-30 | Solar LED (light-emitting diode) lamp string drive circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210500530.3A CN103025002B (en) | 2012-11-30 | 2012-11-30 | Solar LED (light-emitting diode) lamp string drive circuit |
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| Publication Number | Publication Date |
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| CN103025002A CN103025002A (en) | 2013-04-03 |
| CN103025002B true CN103025002B (en) | 2015-01-28 |
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| CN201210500530.3A Active CN103025002B (en) | 2012-11-30 | 2012-11-30 | Solar LED (light-emitting diode) lamp string drive circuit |
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| CN109996373A (en) * | 2019-05-15 | 2019-07-09 | 深圳市红邦半导体有限公司 | A kind of control circuit board, control chip and control system |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201629878U (en) * | 2009-12-31 | 2010-11-10 | 西安盛运达电子有限公司 | Solar LED twinkle light controller |
| CN102769959A (en) * | 2011-05-06 | 2012-11-07 | 海洋王照明科技股份有限公司 | LED light-dimming driving circuit |
| CN202958028U (en) * | 2012-11-30 | 2013-05-29 | 宁波来和圣诞礼品有限公司 | Actuating circuit of solar LED (light-emitting diode) lamp string |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1652654A (en) * | 2005-01-17 | 2005-08-10 | 陈其芳 | Micro-consumption intelligent solar lamp for lawn |
| CN201315689Y (en) * | 2008-11-27 | 2009-09-23 | 晋城市环球利特光电技术有限公司 | Solar energy lawn lamp control circuit |
| CN201450314U (en) * | 2009-07-09 | 2010-05-05 | 南京泽延微电子有限公司 | Battery overdischarge protection circuit for solar lawn lamp |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201629878U (en) * | 2009-12-31 | 2010-11-10 | 西安盛运达电子有限公司 | Solar LED twinkle light controller |
| CN102769959A (en) * | 2011-05-06 | 2012-11-07 | 海洋王照明科技股份有限公司 | LED light-dimming driving circuit |
| CN202958028U (en) * | 2012-11-30 | 2013-05-29 | 宁波来和圣诞礼品有限公司 | Actuating circuit of solar LED (light-emitting diode) lamp string |
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| CN103025002A (en) | 2013-04-03 |
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