CN205920292U - Light -operated and liquid crystal light adjusting film drive circuit that can adjust luminance of inverter type - Google Patents
Light -operated and liquid crystal light adjusting film drive circuit that can adjust luminance of inverter type Download PDFInfo
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- CN205920292U CN205920292U CN201620842460.3U CN201620842460U CN205920292U CN 205920292 U CN205920292 U CN 205920292U CN 201620842460 U CN201620842460 U CN 201620842460U CN 205920292 U CN205920292 U CN 205920292U
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Abstract
The utility model provides a light -operated and liquid crystal light adjusting film drive circuit that can adjust luminance of inverter type, include: switching power supply part, light -operated switch portion branch, environment optical detection part, the photosensitive subtotal contravariant of the adjusting luminance part of stepping up, when environmental illumination was greater than a definite value, switch tube Q2 closed the LED light source during light -operated switch portion divided, otherwise switch tube Q2 keeps the LED light source to be the open mode, the photosensitive part of adjusting luminance is including amplifier IC2 and light intensity sensor SEN1, the illuminance that amplifier IC2's output voltage and light intensity sensor SEN1 are shone is directly proportional, the contravariant is stepped up and is partly included a pulse generator IC3, and the duty cycle of the PWM signal of its output receives amplifier IC2 output voltage's control, the PWM signal control switch of pulse generator IC3 output manages switching on of Q3 and ends, and then control inverter step up transformer T3's output voltage, draw together a pulse generator IC3 and make inverter output alternating voltage's frequency be 200Hz 1kHz.
Description
Technical field
This utility model is related to a kind of dimming driving circuit, more particularly, to a kind of dimming driving circuit of liquid crystal light modulation film.
Background technology
The driving of liquid crystal light modulation film, in the field of business is to be directly driven after capacitance decompression with civil power.General liquid crystal light modulation film consumption
Electrical power about 4w/m2, interpolar equivalent capacity about 2.4 μ f/m2, because interpolar equivalent capacity larger it is impossible to high frequency electric source drive, this
Sample, if light modulation membrane area larger (with 30m2As a example) power consumption is 120w, (or will be made with the Industrial Frequency Transformer of more than 150va
With multiple transformators less than 150va), make driving means high cost, volume is big, heavy.The nothing of liquid crystal light modulation film driving power supply
Work(power is much bigger compared with active power, thus power factor is relatively low.
Utility model content
Technical problem underlying to be solved in the utility model is to provide that a kind of contravariant is light-operated and the liquid crystal of tunable optical is adjusted
Light film drive circuit, improves the frequency of driving voltage, thus reducing the volume and weight of driving means.
In order to solve above-mentioned technical problem, this utility model provides that a kind of contravariant is light-operated and the liquid crystal of tunable optical is adjusted
Light film drive circuit, comprising: switching power supply parts, light-operated switch part, environment light detecting portion, photosensitive dimming portion and inversion
Boosting part；
Described switching power supply parts export two output voltage；Wherein one road output voltage is partly defeated by described light-operated switch
Go out to LED light source；Another road output voltage is used for supplying to environment light detecting portion, photosensitive dimming portion and inversion boosting part
Electricity；
When ambient light illumination be more than certain value when, in environment light detecting portion transistor q4 conducting, light-operated switch partly in
Switching tube q2 closes LED light source, and otherwise switching tube q2 keeps LED light source is open mode；Photosensitive dimming portion includes illumination and passes
Sensor sen1 and amplifier ic2；The output voltage of amplifier ic2 illumination irradiated to optical sensor sen1 is directly proportional；Institute
State inversion boosting part and include the first pulse signal generator ic3, the dutycycle of the pwm signal of its output is subject to amplifier ic2 defeated
Go out the control of voltage；The conducting of pwm Signal-controlled switch pipe q3 of the first pulse signal generator ic3 output and cut-off, and then
Control the output voltage of inverter transformer t3, the alternating current voltage frequency of inverter transformer t3 output is 200hz-1khz, by
Pulse generator ic3 determines；The alternating voltage of inverter transformer t3 output is exported by cn2.
In a preferred embodiment: described switching power supply parts include emi filter network, bridge rectifier and switch electricity
Source converter；Alternating current power supply is powered to described switching power converters after emi filter network and bridge rectifier.
In a preferred embodiment: described switching power converters bag the second pulse signal generator ic1, switching tube q1 and
Switch transformer t2；Wherein, the pwm signal output of the second pulse signal generator ic1 output, to the grid of switching tube q1, switchs
The source electrode of pipe q1 connects the primary coil of switch transformer t1；By adjusting the pwm signal of the second pulse signal generator ic1 output
Dutycycle can change ON time and the deadline of switching tube qi, and then changes the electricity of switch transformer t2 secondary coil output
Pressure and electric current.
In a preferred embodiment: described transistor q4 base stage is connected with photoconductive resistance r28, grounded emitter, colelctor electrode
Connect to the grid of switching tube q2.
In a preferred embodiment: the pwm signal output of described inverter pwm signal generator ic3 output is to switching tube
The grid of q3, the source electrode of switching tube q3 connects the primary coil of inverter transformer t3.
Compared to prior art, the technical solution of the utility model possesses following beneficial effect:
This utility model provide a kind of contravariant is light-operated and the liquid crystal light modulation film drive circuit of tunable optical, by by city
The frequency of electricity is drawn high as 200hz-1khz, can effectively reduce driving means and volume and weight.And achieve according to environment
The voltage of the strong and weak change adjust automatically inversion boosting part output of light, thus implement to adjust the soft degree of LED light source.
Brief description
Fig. 1 is the circuit diagram of this utility model preferred embodiment.
Specific embodiment
Below in conjunction with the drawings and specific embodiments, this utility model is described further.
With reference to Fig. 1, a kind of contravariant is light-operated and the liquid crystal light modulation film drive circuit of tunable optical, comprising: switching power supply parts
1st, light-operated switch part 2, environment light detecting portion 3, photosensitive dimming portion 4 and inversion boosting part 5；
Described switching power supply parts 1 include emi filter network, bridge rectifier and switching power converters；Civil power warp
Cross emi filter network, power to described switching power converters after bridge rectifier.In the present embodiment, described emi filters net
Network is made up of electric capacity c1～c4, transformator t1.
Described switching power converters include pwm signal generator ic1, switching tube q1 and switch transformer t2；Wherein,
The pwm signal output of pwm signal generator ic1 output to switching tube q1 grid, the source electrode of switching tube q1 connects switch transformer
The primary coil of t1；When the pwm signal dutyfactor being exported by adjusting pwm signal generator ic1 changes the conducting of switching tube qi
Between and deadline, and then change switch transformer t2 secondary coil output voltage and current.
Switch transformer t2 secondary coil exports two-way voltage signal.Wherein one road output voltage is by described light-operated switch portion
2 are divided to export to LED light source；Another road output voltage is used for environment light detecting portion 3, photosensitive dimming portion 4 and inversion boosting
Part 5 is powered；
Transistor q4 base stage in described environment light detecting portion 3 is connected with photoconductive resistance r28, grounded emitter, current collection
Pole connects to the grid of switching tube q2.
The colelctor electrode of transistor q4 connects to the grid of switching tube q2.When ambient light illumination is more than certain value, transistor q4
Conducting, switching tube q2 closes LED light source, and otherwise switching tube q2 keeps LED light source is open mode.
Photosensitive dimming portion 4 includes optical sensor sen1 and amplifier ic2；The output voltage of amplifier ic2 and illumination
The irradiated illumination of sensor sen1 is directly proportional.
Described inversion boosting part 5 includes pwm signal generator ic3, and the dutycycle of the pwm signal of its output is subject to amplifier
The control of ic2 output voltage.The pwm signal output of described inverter pwm signal generator ic3 output to switching tube q3 grid
Pole, the source electrode of switching tube q3 connects the primary coil of inverter transformer t3.By inverter pwm signal generator ic3 output
The conducting of pwm Signal-controlled switch pipe q3 and cut-off, and then control the output voltage of inverter transformer t3, inverter transformer
The alternating current voltage frequency of t3 output is 200hz-1khz, is determined by pulse generator ic3；The exchange of inverter transformer t3 output
Voltage is exported by cn2, thus having reached purpose with an automatic light meter.
It is 200hz-1khz electric current because by frequency, the civil power for 50hz is converted to frequency, the volume and weight of driving means
All greatly reduced.
This utility model is not limited to aforesaid specific embodiment.Above-described embodiment should not be considered as limiting this practicality
New scope.Every any simple modification above example made according to technical spirit of the present utility model, equivalent change
Change and modify, each fall within the protection domain of technical solutions of the utility model.
Claims (5)
1. a kind of contravariant is light-operated and the liquid crystal light modulation film drive circuit of tunable optical is it is characterised in that include: switching power supply parts,
Light-operated switch part, environment light detecting portion, photosensitive dimming portion and inversion boosting part；
Described switching power supply parts export two-way voltage；Wherein one road output voltage is exported to led by described light-operated switch part
Light source；Another road output voltage is used for powering to environment light detecting portion, photosensitive dimming portion and inversion boosting part；
When ambient light illumination is more than certain value, the switching tube q4 in environment light detecting portion turns on, light-operated switch part breaker in middle
Pipe q2 closes LED light source, and otherwise switching tube q2 keeps LED light source is open mode；Photosensitive dimming portion include amplifier ic2 and
Optical sensor sen1；The output voltage of amplifier ic2 illumination irradiated to optical sensor sen1 is directly proportional；Described inversion
Boosting section is divided including the first pulse signal generator ic3, and the dutycycle of the pwm signal of its output is subject to amplifier ic2 output voltage
Control；The conducting of pwm Signal-controlled switch pipe q3 of the first pulse signal generator ic3 output and cut-off, and then control inverse
Become the output voltage of device transformator t3, the alternating current voltage frequency of inverter transformer t3 output is 200hz-1khz, is sent out by pulse
Raw device ic3 determines；The alternating voltage of inverter transformer t3 output is exported by cn2.
2. a kind of contravariant according to claim 1 is light-operated and the liquid crystal light modulation film drive circuit of tunable optical, and its feature exists
In: described switching power supply parts include emi filter network, bridge rectifier and switching power converters；Alternating current power supply is passed through
Power to described switching power converters after emi filter network and bridge rectifier.
3. a kind of contravariant according to claim 2 is light-operated and the liquid crystal light modulation film drive circuit of tunable optical, and its feature exists
In: described switching power converters include the second pulse signal generator ic1, switching tube q1 and switch transformer t2；Wherein,
The pwm signal output of two pulse signal generator ic1 outputs to switching tube q1 grid, the source electrode of switching tube q1 connects switch transformation
The primary coil of device t1；Change switching tube qi by adjusting the pwm signal dutyfactor of the second pulse signal generator ic1 output
ON time and deadline, and then change switch transformer t2 secondary coil output voltage and current.
4. a kind of contravariant according to claim 1 is light-operated and the liquid crystal light modulation film drive circuit of tunable optical, and its feature exists
In: described switching tube q4 grid is connected with photoconductive resistance r28, source ground, and drain electrode connects to the grid of switching tube q2.
5. a kind of contravariant according to claim 1 is light-operated and the liquid crystal light modulation film drive circuit of tunable optical, and its feature exists
In: the pwm signal of described first pulse signal generator ic3 output delivers to the grid of switching tube q3, and the source electrode of switching tube q3 connects
The primary coil of inverter transformer t3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620842460.3U CN205920292U (en) | 2016-08-05 | 2016-08-05 | Light -operated and liquid crystal light adjusting film drive circuit that can adjust luminance of inverter type |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620842460.3U CN205920292U (en) | 2016-08-05 | 2016-08-05 | Light -operated and liquid crystal light adjusting film drive circuit that can adjust luminance of inverter type |
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| Publication Number | Publication Date |
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| CN205920292U true CN205920292U (en) | 2017-02-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620842460.3U Active CN205920292U (en) | 2016-08-05 | 2016-08-05 | Light -operated and liquid crystal light adjusting film drive circuit that can adjust luminance of inverter type |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107463127A (en) * | 2017-07-28 | 2017-12-12 | 厦门乐人电子有限公司 | Light-adjustment film intelligent controller |
| CN110268307A (en) * | 2017-02-02 | 2019-09-20 | 凸版印刷株式会社 | Dimming device |
-
2016
- 2016-08-05 CN CN201620842460.3U patent/CN205920292U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110268307A (en) * | 2017-02-02 | 2019-09-20 | 凸版印刷株式会社 | Dimming device |
| CN107463127A (en) * | 2017-07-28 | 2017-12-12 | 厦门乐人电子有限公司 | Light-adjustment film intelligent controller |
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Address after: 363000 B, 11th floor, Zhangzhou Development square, Shengli Road, Xiangcheng District, Zhangzhou City, Fujian Province Patentee after: Yunnan chengdaxing Intelligent Technology Co.,Ltd. Address before: 363000 B, 11th floor, Zhangzhou Development square, Shengli Road, Xiangcheng District, Zhangzhou City, Fujian Province Patentee before: FUJIAN CHENGDAXING INTELLIGENT TECHNOLOGY Co.,Ltd. |
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| CP02 | Change in the address of a patent holder |
Address after: 661000 shops 13-7, 8, 9, zhumeng Xincheng community, Beijing Road, Mengzi City, Honghe Hani and Yi Autonomous Prefecture, Yunnan Province Patentee after: Yunnan chengdaxing Intelligent Technology Co.,Ltd. Address before: 363000 B, 11th floor, Zhangzhou Development square, Shengli Road, Xiangcheng District, Zhangzhou City, Fujian Province Patentee before: Yunnan chengdaxing Intelligent Technology Co.,Ltd. |
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| CP03 | Change of name, title or address |
Address after: 77 Beimen West Road, Jiaomei Town, Taishang Investment Zone, Zhangzhou City, Fujian Province Patentee after: FUJIAN CHENGDAXING INTELLIGENT TECHNOLOGY Co.,Ltd. Country or region after: China Address before: 661000 shops 13-7, 8, 9, zhumeng Xincheng community, Beijing Road, Mengzi City, Honghe Hani and Yi Autonomous Prefecture, Yunnan Province Patentee before: Yunnan chengdaxing Intelligent Technology Co.,Ltd. Country or region before: China |