CN102625535A - Rechargeable lighting device based on pulse width modulation (PWM) dimming - Google Patents
Rechargeable lighting device based on pulse width modulation (PWM) dimming Download PDFInfo
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- CN102625535A CN102625535A CN2012100762167A CN201210076216A CN102625535A CN 102625535 A CN102625535 A CN 102625535A CN 2012100762167 A CN2012100762167 A CN 2012100762167A CN 201210076216 A CN201210076216 A CN 201210076216A CN 102625535 A CN102625535 A CN 102625535A
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Abstract
The invention discloses a rechargeable lighting device based on pulse width modulation (PWM) dimming. According to the lighting device, a power converter inputs a voltage; reverse connection protection of the power converter is realized by a forward protection diode; a battery charging management circuit charges a lithium battery by utilizing a stable voltage output by the power converter; the lithium battery drives a light emitting diode (LED) lamp to emit light through an LED drive circuit; a central processing unit (CPU) controls signals input to the LED drive circuit; the adjustment of lighting brightness is realized by adjusting duty cycle pulse width; and the CPU detects the electric quantity of the lithium battery by acquiring the voltage of the lithium battery by an analogue device (AD), reads key information by checking a switching value, and outputs PWM square waves with different duty cycles to the LED drive circuit according to the acquired electric quantity of the lithium battery and the key information so as to realize dimming. By using the rechargeable lighting device, the power consumption of LED drive is reduced, the efficiency of the LED lighting device is improved, and the battery can be charged in a short time.
Description
Technical field
The present invention relates to a kind of lighting device.
Background technology
Along with outdoor exercises more and more receive people's welcome, field encampment is unavoidable, and lighting apparatus is also just essential reliably.Microelectric technique constantly develops at present; The reliability and the high accuracy of digital control chip are greatly improved; The power supply that existing lighting device mainly adopts controllable silicon dimmer and is connected in series with controllable silicon dimmer; The power consumption of this light modulation is bigger, and PWM light modulation power consumption is lower comparatively speaking, more meets to practice thrift and environmental protection requirement.And utilize the LED lamp of PWM light modulation at present, function ratio is more single, lacks charging and battery management system, can not realize quick charge and the long-time function of using the battery illumination can't the lighting device of low-power consumption being applied to portable outdoor field.
In sum, need to invent a kind of integrated use the portable lighting device of battery charging management technology and PWM light regulating technology, supplied to utilize for a long time the occasion of battery illumination to use.
Summary of the invention
The prior art power consumption is big in order to overcome, the efficient of power supply is low, be not easy to accomplish quick charge and deficiency such as be convenient for carrying; The invention provides a kind of lighting device; Utilization PWM light regulating technology reduces power consumption, and utilization battery charging management technology makes it easy to carry for the lighting device charging.
The technical solution adopted for the present invention to solve the technical problems is: comprise supply convertor, battery charging management circuit, lithium battery, LED lamp drive circuit and CPU.Supply convertor uses wide input range, and (4.5V～36V) single-chip DC-DC inverter is realized, can realize wide input voltage range, and realizes the anti-reverse defencive function of supply convertor through forward protection diode.Battery charging management circuit then is that the burning voltage of employs power converter output is a lithium cell charging; Charging process adopts constant current charge; Can change the current value of constant current charge through the resistance of regulating charging resistor, adopt the charging current of 1.5A among the present invention, be quickly charging battery.Lithium battery is luminous through led drive circuit driving LED lamp, and for realizing the adjusting of illumination brightness, CPU control inputs to the signal of led drive circuit, through the duty ratio pulse-width regulated being realized the adjusting of brightness of illumination.For realizing battery voltage detection function, PWM light modulation output, select for use the MCU chip as system's Controlled CPU.CPU gathers the electric weight that lithium battery voltage detects lithium battery through AD, and reads key information through switching value inspection, realizes light modulation according to the PWM square wave of lithium battery electric weight of being gathered and key information output different duty to drive circuit.Under off-mode, CPU is in holding state, and standby current is enough low when guaranteeing battery storage.Just can accomplish function through supply convertor and battery charging management circuit, when the utilization battery is lighted the LED illuminating lamp, realize different brightness illuminations through send different duty with MCU to quickly charging battery.
The invention has the beneficial effects as follows: with existing invention contrast, the present invention utilizes PWM brightness regulation technology to realize the adjusting of brightness of illumination, greatly reduces the power consumption that LED drives, and has improved the efficient of LED lighting device, saves energy consumption; Simultaneously, the present invention has been equipped with quick-charging circuit, accomplishes battery charge at short notice; The two combine fully to have realized low-power consumption, can for a long time battery operated illumination functions.
Characteristics of the present invention are that (1) used the PWM light regulating technology, and this device adopts the 12f683MCU of Micochip company, and it has the wide region operating voltage; The inside oscillator of the highest 8M; Low-power consumption, and be furnished with A/D convertor circuit, can realize sending the PWM of different duty fully according to instruction; (2) on the basis of low-power consumption, be equipped with battery charging management circuit, the MP2607 that this device adopts MPS company can realize the intelligent management of charging and discharging to lithium battery, carries battery temperature monitoring thermistor input interface and prevents that battery is overheated.(3) supply convertor circuit; This device adopts the integrated regulator chip MP4462 of MPS company; Voltage conversion circuit uses wide input range single-chip DC-DC inverter to realize, for satisfying wide input voltage range 4.5V～30V, has improved the convenience of battery charge greatly.
Description of drawings
Fig. 1: the structural representation that LED according to the invention is whole;
Fig. 2: supply convertor circuit theory diagrams;
Fig. 3: battery charging management circuit schematic diagram;
Fig. 4: CPU and led drive circuit schematic diagram.
Embodiment
The present invention includes supply convertor, battery charging management circuit, lithium battery, LED lamp drive circuit and CPU.Supply convertor uses wide input range, and (4.5V～36V) single-chip DC-DC inverter is realized, can realize wide input voltage range, and realizes the anti-reverse defencive function of supply convertor through forward protection diode.Battery charging management circuit then is that the burning voltage of employs power converter output is a lithium cell charging; Charging process adopts constant current charge; Can change the current value of constant current charge through the resistance of regulating charging resistor, adopt the charging current of 1.5A among the present invention, be quickly charging battery.Led drive circuit driving LED lamp is luminous, and for realizing the adjusting of illumination brightness, CPU control inputs to the signal of led drive circuit, through the duty ratio pulse-width regulated being realized the adjusting of brightness of illumination.For realizing battery voltage detection function, PWM light modulation output, select for use the MCU chip as system's Controlled CPU.CPU gathers the electric weight that lithium battery voltage detects lithium battery through AD, and reads key information through switching value inspection, realizes light modulation according to the PWM square wave of lithium battery electric weight of being gathered and key information output different duty to drive circuit.Under off-mode, CPU is in, and standby current is enough low when guaranteeing battery storage.Just can accomplish function through supply convertor and battery charging management circuit, when the utilization battery is lighted the LED illuminating lamp, realize different brightness illuminations through send different duty with MCU to quickly charging battery.
Below in conjunction with accompanying drawing and embodiment the present invention is further specified.
As shown in Figure 1, the present invention includes supply convertor (input voltage range 4.5V～30V), battery charging management circuit, lithium battery, LED lamp drive circuit, CPU and housing.
The supply convertor circuit is with the supply voltage process reduction voltage circuit of 4.5V～30V, is transformed to stable voltage and exports to battery charging management circuit; The supply convertor circuit adopts the MP4462 chip, and circuit connecting relation is as shown in Figure 2, and SW pin and D1, L1, C2 form a buck circuit, and output voltage is regulated by R1 and R2 value.R1 of the present invention, R2 value are selected 270K, 56K, and output voltage V CHG is 5V.The Schottky diode D1 ground connection of low forward voltage drop and diode near the SW pin to reduce switch spike.Connect the EN pin through VIN, can accomplish buck functionality so that under the situation that the voltage input is arranged, enable supply convertor.The CPMP pin can the output error amplifier, and this pin control loop frequency compensation, its function make that the voltage of output is more steady.The value of R4 is determining the input of BUCK contactor frequency programs.It is 200K Ω that the present invention selects the value of R4 for use, and switching frequency is 900KHZ.
Battery charging management circuit on the one hand can voltage changer output burning voltage be battery charge, charging modes adopts constant current charging mode; On the other hand; The management battery perhaps uses the converter output voltage to supply power as system; Its circuit connecting figure is as shown in Figure 3, and IN connects pin for the voltage changer output voltage, and MODE is a circuit input voltage model selection pin; Through on draw or drop-down selection power supply adaptor input voltage or USB input voltage the last power supply adaptor pattern of selecting of drawing of the present invention; ICHSET and outer meeting resistance R12 can select constant current value in the battery charging process, and it is 1.5K resistance (charging current is 1.5A) that the present invention selects R12, and battery capacity is 4200mAh among the present invention, and then the charging interval is 2.8 hours.TMR and external capacitor C10 are provided with the trickle charge time upper limit, and for guaranteeing that battery can once charge, the trickle charge upper limit was greater than 2.8 hours; So C10 selects 4.7uF (being limited to 7.2 hours on the charging interval); CEB is the chip enable pin, and low level is effective, so adopt the mode of drop-down ground connection to enable.VSYS is as output, and to system's power supply, circuit has two indicator lights simultaneously, can indicate charging, is full of, malfunction.BATT links to each other with anode, is used for the charging and the management of battery.
CPU and led drive circuit are the main circuits of realizing low-power consumption LED illumination, and its circuit connection diagram is as shown in Figure 4, and that CPU adopts is the PIC12F683 of Microchip company, and drive circuit mainly adopts the MP3305 chip drives LED lamp of MPS company luminous.CPU is according to the correlation function information of KEY1, KEY2 key commands and PGD, PGC (AD changes mouth); Send PWM by the different duty ratio of software arrangements and through the GP5 pin to led drive circuit; The PWM that this pin sends is accepted by the enable pin EN of chip for driving; The EN pin of MP3305 enables chip operation when high level, thereby utilization PWM changes the brightness of LED.In drive circuit, C1, L and D form a boost booster circuit, and it is simultaneously luminous that every chip for driving can drive six LED; The ISET pin is the output source of internal dimming control switch; Change the LED electric current through outer meeting resistance Rset, the present invention selects 3.3 Ω resistance, and the LED total current is 170mA when brightness is the highest; The 4200mA battery can light 24.5 hours continuously, realized low-power consumption, durable illumination functions.
Claims (6)
1. chargeable lighting device based on the PWM light modulation; Comprise supply convertor, battery charging management circuit, lithium battery, LED lamp drive circuit and CPU; It is characterized in that: the supply convertor input voltage, and through the anti-reverse protection of forward protection diode realization supply convertor; The burning voltage of battery charging management circuit employs power converter output is a lithium cell charging; Lithium battery is luminous through led drive circuit driving LED lamp; CPU control inputs to the signal of led drive circuit, through the duty ratio pulse-width regulated being realized the adjusting of brightness of illumination; CPU gathers the electric weight that lithium battery voltage detects lithium battery through AD, and reads key information through switching value inspection, realizes light modulation according to the PWM square wave of lithium battery electric weight of being gathered and key information output different duty to led drive circuit.
2. the chargeable lighting device based on the PWM light modulation according to claim 1 is characterized in that: described supply convertor uses input range to realize as the single-chip DC-DC inverter of 4.5V～36V.
3. the chargeable lighting device based on the PWM light modulation according to claim 1 is characterized in that: the charging process of described lithium cell charging adopts constant current charge, changes the current value of constant current charge through the resistance of regulating charging resistor.
4. the chargeable lighting device based on the PWM light modulation according to claim 1 is characterized in that: described lithium cell charging adopts the charging current of 1.5A.
5. the chargeable lighting device based on the PWM light modulation according to claim 1 is characterized in that: described CPU adopts the MCU chip.
6. the chargeable lighting device based on the PWM light modulation according to claim 1, it is characterized in that: described CPU is in holding state under off-mode.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012100762167A CN102625535A (en) | 2012-03-21 | 2012-03-21 | Rechargeable lighting device based on pulse width modulation (PWM) dimming |
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| CN2012100762167A CN102625535A (en) | 2012-03-21 | 2012-03-21 | Rechargeable lighting device based on pulse width modulation (PWM) dimming |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103812148A (en) * | 2012-11-08 | 2014-05-21 | 比亚迪股份有限公司 | Mobile power supply |
| WO2015102896A1 (en) * | 2014-01-03 | 2015-07-09 | Capstone Lighting Technologies, LLC | Switch state detection and controlling electrical power |
| CN105323888A (en) * | 2015-10-13 | 2016-02-10 | 陈英涛 | Multifunctional camera light employing high-power integrated LEDs |
| CN105491711A (en) * | 2015-12-21 | 2016-04-13 | 佛山市南海区联合广东新光源产业创新中心 | Drive circuit for LED with adjustable light source |
| CN106939995A (en) * | 2016-11-17 | 2017-07-11 | 东莞市晧业工业设计有限公司 | Photovoltaic intelligent street lamp |
| CN107370200A (en) * | 2017-06-28 | 2017-11-21 | 广东顺德奥能光电科技股份有限公司 | A kind of new succinct charge display method |
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| CN101505565A (en) * | 2009-03-11 | 2009-08-12 | 华中科技大学 | SoC chip for independent photovoltaic LED lighting special controller |
| CN202059636U (en) * | 2011-05-12 | 2011-11-30 | 厦门靓星光电科技有限公司 | Intelligent control system of solar energy road lamp |
| CN202514128U (en) * | 2012-03-21 | 2012-10-31 | 西北工业大学 | Charging illumination device capable of dimming |
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Patent Citations (3)
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| CN101505565A (en) * | 2009-03-11 | 2009-08-12 | 华中科技大学 | SoC chip for independent photovoltaic LED lighting special controller |
| CN202059636U (en) * | 2011-05-12 | 2011-11-30 | 厦门靓星光电科技有限公司 | Intelligent control system of solar energy road lamp |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103812148A (en) * | 2012-11-08 | 2014-05-21 | 比亚迪股份有限公司 | Mobile power supply |
| WO2015102896A1 (en) * | 2014-01-03 | 2015-07-09 | Capstone Lighting Technologies, LLC | Switch state detection and controlling electrical power |
| US9425649B2 (en) * | 2014-01-03 | 2016-08-23 | Capstone Lighting Technologies, Llc. | Apparatus and method for switch state detection and controlling electrical power |
| CN105981259A (en) * | 2014-01-03 | 2016-09-28 | 顶点照明科技有限公司 | Switch state detection and controlling electrical power |
| US9608479B2 (en) | 2014-01-03 | 2017-03-28 | Capstone Lighting Technologies, Llc. | Apparatus and method for switch state detection and controlling electrical power |
| US10230262B2 (en) | 2014-01-03 | 2019-03-12 | Capstone Lighting Technologies, Llc. | Apparatus and method for switch state detection and controlling electrical power |
| CN105323888A (en) * | 2015-10-13 | 2016-02-10 | 陈英涛 | Multifunctional camera light employing high-power integrated LEDs |
| CN105491711A (en) * | 2015-12-21 | 2016-04-13 | 佛山市南海区联合广东新光源产业创新中心 | Drive circuit for LED with adjustable light source |
| CN106939995A (en) * | 2016-11-17 | 2017-07-11 | 东莞市晧业工业设计有限公司 | Photovoltaic intelligent street lamp |
| CN107370200A (en) * | 2017-06-28 | 2017-11-21 | 广东顺德奥能光电科技股份有限公司 | A kind of new succinct charge display method |
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Application publication date: 20120801 |