CN201774725U - El cold light source driving circuit - Google Patents
El cold light source driving circuit Download PDFInfo
- Publication number
- CN201774725U CN201774725U CN2010202794690U CN201020279469U CN201774725U CN 201774725 U CN201774725 U CN 201774725U CN 2010202794690 U CN2010202794690 U CN 2010202794690U CN 201020279469 U CN201020279469 U CN 201020279469U CN 201774725 U CN201774725 U CN 201774725U
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- pin
- light source
- cold light
- imp803
- electroluminescent lamp
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
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- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The utility model discloses an EL cold light source driving circuit, which comprises an electroluminescent lamp driving integrated circuit IMP803, an amplifying circuit (3), an energy storage inductor (L3), a charging capacitor (C2) and a diode (D2). An anode of an output end of the amplifying circuit (3) is connected with an 8th pin, a cathode of the output end of the amplifying circuit (3) is connected with a 2nd pin, the energy storage inductor (L2) is connected between a 4th pin and a power source (Vcc), the charging capacitor (C2) is connected between a 3rd pin and the ground, the diode (D2) is serially connected between the energy storage inductor (L2) and the charging capacitor (C2), a 1st pin and a 5th pin are respectively connected with the power source (Vcc) and the ground, a 6th pin and a 7th pin are connected with an EL cold light source, and the all pins are the pins of the electroluminescent lamp driving integrated circuit IMP803. In addition, the EL cold light source driving circuit has the advantages of simple structure, reliable work, and capability of avoiding generating high-frequency noise easily.
Description
Technical field
The utility model relates to air-conditioning LCD backlight technology field, relates in particular to the EL cold light source, specifically is meant a kind of EL cold light source drive circuit.
Background technology
More and more be subjected to user's favor in the application of air conditioner industry luminescence technology, particularly in the use of LCD LCDs, the application of backlight technology is absolutely necessary.The backlight effect is the brightness that highlights LCD, is convenient to the user and sets the comfortable condition of work of air-conditioning.The LCD backlight of air conditioner industry generally all adopts the LED illumination mode at present, and lights the monoblock backlight by means of the light reflection mode of each point of light guide plate surface.On the control circuit of light-emitting diode, adopt the mode that directly adds direct voltage, but shortcomings such as power consumption is big, temperature rise height that the work of led drive circuit exists, in addition because the limitation of luminous body own easily forms point-source of light, light-emitting zone is little, aesthetics, reliability to product all can cause certain flaw.And the thickness of the used EL cold light source sheet of EL cold light source is generally less than 0.2 millimeter, form by having sprayed an effect EL material on the dielectric base and being clipped between the two-layer electrode, by high frequency, high-voltage alternating electric excitation, cause luminous, power consumption is very low, and luminosity is even, thereby has obtained utilization widely in the demonstration backlight of LCD.
Existing EL cold light source drive circuit generally adopts discrete circuit, is a kind of common EL cold light source drive circuit as shown in Figure 1, comprises switching voltage translation circuit 1 and H bridge switch translation circuit 2, and its course of work is as follows:
When the single-chip processor i/o port is opened high-frequency generator ZTQ1 generation metal-oxide-semiconductor gate pole trigger impulse MT signal, the MT conducting, low voltage voltage Vcc gives inductive energy storage by inductance L and MT loop; After trigger impulse finishes, MT closes, energy on the inductance L charges to electric capacity by diode D, at this moment the voltage on the capacitor C s just equals supply voltage VDD and inductive drop VL sum, by this kind working method, the duty that can change the gate pole trigger impulse is recently adjusted the height of output voltage V CS.
Open the start pulse signal that low-frequency oscillator ZTQ1 produces by single-chip microcomputer equally, be used to control four switching tubes of H bridge, make T1, T3 and T2, T4 alternate conduction, high voltage direct current, realize the DC-AC conversion, thereby produce the AC drive voltage of high pressure, high frequency in EL lamp both sides.
This EL cold light source drive circuit is a discrete circuit, the circuit more complicated, to the parameter request of device than higher, power consumption is big, simultaneously when the PWM duty ratio is regulated and control, because of switching tube is operated in operating frequency about 100HZ, on circuit trace, form vibration easily, produce high-frequency noise.
The utility model content
The technical problems to be solved in the utility model is, a kind of simple in structure, reliable operation is provided, is difficult for producing the EL cold light source drive circuit of high-frequency noise.
Technical solution of the present utility model provides a kind of EL cold light source drive circuit, comprise electroluminescent lamp drive integrated circult IMP803, amplifying circuit, energy storage inductor and charging capacitor and diode, the positive pole of the output of amplifying circuit is connected with the 8th pin of electroluminescent lamp drive integrated circult IMP803, the negative pole of amplification circuit output end is connected with the 2nd pin with electroluminescent lamp drive integrated circult IMP803, between the 4th pin and power supply that are connected electroluminescent lamp drive integrated circult IMP803 of described energy storage inductor, described charging inductance is connected between the 3rd pin and ground of electroluminescent lamp drive integrated circult IMP803, described diode is serially connected between energy storage inductor and the charging capacitor, the 1st pin of electroluminescent lamp drive integrated circult IMP803 is connected power supply and ground respectively with the 5th pin, and the 6th pin of electroluminescent lamp drive integrated circult IMP803 is connected with the EL cold light source with the 7th pin.
The utility model is used the electroluminescent lamp drive integrated circult IMP803 of USA I P company exploitation, adopt the CMOS advanced technologies, have advantages such as low in energy consumption, that speed is fast, antijamming capability is strong, its inner integrated pwm control circuit and conversion switch, can add simple electric capacity, inductance, diode in the periphery, just can produce stable high frequency, High Level AC Voltage, the utility model also adopts amplifying circuit that electroluminescent lamp drive integrated circult IMP803 is driven in addition, makes that whole EL cold light source drive circuit works is more reliable.
As preferably, described amplifying circuit is a common collector amplifying circuit.
As preferably, described amplifying circuit comprises triode, biasing resistor, first current-limiting resistance, second current-limiting resistance and the 3rd current-limiting resistance, the two ends of described biasing resistor connect the base stage of triode and an I/O port of single-chip microcomputer respectively, the two ends of described first current-limiting resistance connect the input of switching voltage translation circuit and the collector electrode of triode respectively, described second current-limiting resistance and the 3rd current-limiting resistance parallel connection and two ends are connected the collector electrode and the ground connection of triode respectively, and the emitter of triode connects power supply.
Above-mentioned preferred case has advantage simple in structure, reliable operation as a kind of amplifying circuit commonly used.
As improvement, also comprise first filter capacitor, first filter capacitor is connected between second current-limiting resistance and the ground, can eliminate the demonstration flicker of appearance by first filter capacitor is set.
As improvement, also comprise second filter capacitor, second filter capacitor is connected between power supply and the ground, and this improvement is the noise in the filtering circuit effectively, makes circuit working more reliable.
As improvement, also comprise overcurrent protection resistance, overcurrent protection resistance is connected between the 7th pin and EL cold light source of electroluminescent lamp drive integrated circult IMP803, and this overcurrent protection resistance is used to protect bridge circuit to exempt from the influence of peak current.
Description of drawings
Fig. 1 is a kind of EL cold light source drive circuit schematic diagram of prior art.
Fig. 2 is the utility model EL cold light source driving circuit structure schematic diagram.
Shown in the figure: 1, switching voltage translation circuit 2, H bridge switch translation circuit 3, amplifying circuit
Embodiment
Embodiment of the present utility model is described in detail the technical solution of the utility model for better illustrating below in conjunction with accompanying drawing.
As shown in Figure 2, the utility model EL cold light source drive circuit comprises electroluminescent lamp drive integrated circult IMP803, amplifying circuit 3, energy storage inductor L2 and charging capacitor C2 and diode D2, the positive pole of the output of amplifying circuit 3 is connected with the 8th pin of electroluminescent lamp drive integrated circult IMP803, the negative pole of amplifying circuit 4 outputs is connected with the 2nd pin with electroluminescent lamp drive integrated circult IMP803, between the 4th pin and power Vcc that are connected electroluminescent lamp drive integrated circult IMP803 of described energy storage inductor L2, described charging inductance C2 is connected between the 3rd pin and ground of electroluminescent lamp drive integrated circult IMP803, described diode D2 is serially connected between energy storage inductor L2 and the charging capacitor C2, the 1st pin of electroluminescent lamp drive integrated circult IMP803 is connected power Vcc and ground respectively with the 5th pin, and the 6th pin of electroluminescent lamp drive integrated circult IMP803 is connected with the EL cold light source with the 7th pin.Described amplifying circuit 3 is a common collector amplifying circuit, comprise triode Q1, biasing resistor R7, the first current-limiting resistance R4, the second current-limiting resistance R5 and the 3rd current-limiting resistance R6, the two ends of described biasing resistor R7 connect the base stage of triode Q1 and an I/O port of single-chip microcomputer respectively, the two ends of the described first current-limiting resistance R4 connect the input of switching voltage translation circuit 1 and the collector electrode of triode Q1 respectively, the described second current-limiting resistance R5 and the 3rd current-limiting resistance R6 parallel connection and two ends are connected collector electrode and the ground connection of triode Q1 respectively, and the emitter of triode Q1 connects power Vcc.
As a kind of execution mode preferably; also comprise the first filter capacitor C3, the second filter capacitor C4 and overcurrent protection resistance R 3 in the present embodiment; the first filter capacitor C3 is connected between the second current-limiting resistance R5 and the ground; the second filter capacitor C4 is connected between power Vcc and the ground, and overcurrent protection resistance R 3 is connected between the output and EL cold light source of H bridge switch translation circuit 2.
The utility model utilizes common collector amplifying circuit that electroluminescent lamp drive integrated circult IMP803 is driven in the course of the work, under the control of output high-low level, electroluminescent lamp drive integrated circult IMP803 have pwm control circuit and conversion switch cooperate energy storage inductor L2 and charging capacitor C2 to produce the excitation power supply of high frequency, high pressure, thereby it is luminous to drive the EL cold light source.
In the above-described embodiments; preferred forms of the present utility model is described; obviously; under inventive concept of the present utility model; still can make a lot of variations; overcurrent protection resistance as described also can be connected between the 6th pin and EL cold light source of electroluminescent lamp drive integrated circult IMP803, and and for example, described amplifying circuit also can adopt other various types of amplifying circuits.At this, should illustrate that any change of being made all will fall in the protection range of the present utility model under inventive concept of the present utility model.
Claims (7)
1. EL cold light source drive circuit, it is characterized in that: comprise electroluminescent lamp drive integrated circult IMP803, amplifying circuit (3), energy storage inductor (L2) and charging capacitor (C2) and diode (D2), the positive pole of the output of amplifying circuit (3) is connected with the 8th pin of electroluminescent lamp drive integrated circult IMP803, the negative pole of amplifying circuit (4) output is connected with the 2nd pin of electroluminescent lamp drive integrated circult IMP803, described energy storage inductor (L2) is connected between the 4th pin and power supply (Vcc) of electroluminescent lamp drive integrated circult IMP803, described charging inductance (C2) is connected between the 3rd pin and ground of electroluminescent lamp drive integrated circult IMP803, described diode (D2) is serially connected between energy storage inductor (L2) and the charging capacitor (C2), the 1st pin of electroluminescent lamp drive integrated circult IMP803 is connected power supply (Vcc) and ground respectively with the 5th pin, and the 6th pin of electroluminescent lamp drive integrated circult IMP803 is connected with the EL cold light source with the 7th pin.
2. EL cold light source drive circuit according to claim 1 is characterized in that: described amplifying circuit (3) is a common collector amplifying circuit.
3. EL cold light source drive circuit according to claim 2, it is characterized in that: described amplifying circuit (3) comprises triode (Q1), biasing resistor (R7), first current-limiting resistance (R4), second current-limiting resistance (R5) and the 3rd current-limiting resistance (R6), the two ends of described biasing resistor (R7) connect the base stage of triode (Q1) and an I/O port of single-chip microcomputer respectively, the two ends of described first current-limiting resistance (R4) connect the input of switching voltage translation circuit (1) and the collector electrode of triode (Q1) respectively, described second current-limiting resistance (R5) and (R6) parallel connection of the 3rd current-limiting resistance and two ends are connected the collector electrode and the ground connection of triode (Q1) respectively, and the emitter of triode (Q1) connects power supply (Vcc).
4. EL cold light source drive circuit according to claim 3 is characterized in that: also comprise first filter capacitor (C3), filter capacitor (C3) is connected between second current-limiting resistance (R5) and the ground.
5. EL cold light source drive circuit according to claim 3 is characterized in that: also comprise first filter capacitor (C4), filter capacitor (C4) is connected between power supply (Vcc) and the ground.
6. EL cold light source drive circuit according to claim 4 is characterized in that: also comprise second filter capacitor (C4), filter capacitor (C11) is connected between power supply (Vcc) and the ground.
7. according to the described arbitrary EL cold light source drive circuit of claim 1 to 6, it is characterized in that: also comprise overcurrent protection resistance (R3), overcurrent protection resistance (R3) is connected between the output and EL cold light source of H bridge switch translation circuit (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202794690U CN201774725U (en) | 2010-07-29 | 2010-07-29 | El cold light source driving circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202794690U CN201774725U (en) | 2010-07-29 | 2010-07-29 | El cold light source driving circuit |
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| Publication Number | Publication Date |
|---|---|
| CN201774725U true CN201774725U (en) | 2011-03-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010202794690U Expired - Lifetime CN201774725U (en) | 2010-07-29 | 2010-07-29 | El cold light source driving circuit |
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| CN (1) | CN201774725U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105372547A (en) * | 2015-11-13 | 2016-03-02 | 谢贺年 | Applications of EL technology in numerical control maintenance |
| WO2020238542A1 (en) * | 2019-05-28 | 2020-12-03 | 深圳市萌宠实业有限公司 | Flexible neon automatic retractable pet traction rope |
-
2010
- 2010-07-29 CN CN2010202794690U patent/CN201774725U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105372547A (en) * | 2015-11-13 | 2016-03-02 | 谢贺年 | Applications of EL technology in numerical control maintenance |
| WO2020238542A1 (en) * | 2019-05-28 | 2020-12-03 | 深圳市萌宠实业有限公司 | Flexible neon automatic retractable pet traction rope |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20170531 Address after: 315191 Yinzhou District Province, Ningbo City, Jiang Shan town on the village of summer ho Patentee after: AUX air conditioning Limited by Share Ltd Address before: 315191 Zhejiang city of Ningbo province Jiangshan town Yinzhou District Mingguang Road No. 1166:AUX International Industrial Park Patentee before: Ningbo AUX Group. |
|
| CX01 | Expiry of patent term |
Granted publication date: 20110323 |
|
| CX01 | Expiry of patent term |