CN104637433A - Constant-current drive circuit applicable to LED screen - Google Patents
Constant-current drive circuit applicable to LED screen Download PDFInfo
- Publication number
- CN104637433A CN104637433A CN201310557334.4A CN201310557334A CN104637433A CN 104637433 A CN104637433 A CN 104637433A CN 201310557334 A CN201310557334 A CN 201310557334A CN 104637433 A CN104637433 A CN 104637433A
- Authority
- CN
- China
- Prior art keywords
- electric capacity
- resistance
- voltage
- constant
- capacitor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Rectifiers (AREA)
Abstract
The invention discloses a constant-current drive circuit applicable to an LED screen. The constant-current drive circuit comprises a first resistor, a second resistor, a third resistor, a fourth resistor, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a fifth capacitor, a diode, a first voltage stabilizing diode, a second voltage stabilizing diode, a photoelectric coupler, a DC (direct current) switch converter and a bridge rectifier circuit. The first end of the fifth capacitor is connected with the first AC (alternating current) input end of the bridge rectifier current and positive voltage. The second end of the fifth capacitor is connected with the second AC input end of the bridge rectifier circuit and negative voltage. According to the arrangement, a low-end buck converter of the constant-current drive circuit of the LED screen can provide 130 mA constant current and 70 V DC output voltage under the AC input voltage between 90 V and 132 V; the constant-current drive circuit is applicable to driving the constant-current-driven LED screen; the first capacitor reduces conductive electromagnetic interference, the bridge rectifier circuit provides full-wave rectification, the second capacitor maintains stable DC bus voltage, and normal display of the LED screen is guaranteed.
Description
Technical field
The present invention relates to a kind of driving circuit, particularly relate to a kind of constant-current drive circuit being applicable to LED display.
Background technology
Along with the progress of society, traditional teaching method and growing science and technology can not be met, now except traditional teaching method most schools starts to adopt various novel teaching method, wherein MCAI is the most a kind of teaching method used, MCAI refers to and utilizes multimedia computer, overall treatment and control character, language, word, sound, figure, image, the media information such as image, each key element multimedia is pressed teaching request, carry out organic assembling and by screen display out, add the cooperation of sound on demand simultaneously, and the man-machine interactive operation between user and computing machine, complete teaching or training process, therefore LED display is as equipment very important in Multimedia assisted instruction, it stablizes the particularly important of lasting work change, LED screen may be made to glimmer constantly if there is the unstable rule of electric current, certain damage is caused to LED screen.
Summary of the invention
Object of the present invention is just to provide a kind of constant-current drive circuit being applicable to LED display to solve the problem.
The present invention is achieved through the following technical solutions above-mentioned purpose:
A kind of constant-current drive circuit being applicable to LED display, comprise the first resistance to the 4th resistance, first electric capacity is to the 5th electric capacity, diode, first voltage stabilizing diode, second voltage stabilizing diode, photoelectrical coupler, DC switch converter and bridge rectifier circuit, the described first end of the 5th electric capacity is connected with the first ac input end of described bridge rectifier circuit and connects positive voltage, described second end of the 5th electric capacity is connected with the second ac input end of described bridge rectifier circuit and connects negative voltage, the cathode output end of described bridge rectifier circuit respectively with the first end of described second electric capacity, the negative pole of described diode, the first end of described first electric capacity, the negative pole of described first voltage stabilizing diode, the first end of described 4th electric capacity is connected with the first end of described first resistance, the first end of described first resistance is driving circuit positive voltage output end, the positive pole of described diode is connected with the first end of described inductance and the positive voltage input end of described DC switch converter respectively, the positive pole of described first voltage stabilizing diode is connected with the negative pole of described second voltage stabilizing diode, the positive pole of described second voltage stabilizing diode is connected with the first end of described second resistance, second end of described second resistance respectively with the second end of described 4th electric capacity, the first end of described 3rd resistance is connected with the first input end of described photoelectrical coupler, second end of described first resistance is connected with the second end of described 3rd resistance and the first end of described 4th resistance respectively, second end of described first resistance is driving circuit negative voltage output terminal, second end of described inductance respectively with the second end of described first electric capacity, described second end of the 4th resistance is connected with the second input end of described photoelectrical coupler, the cathode voltage output terminal of described bridge rectifier circuit respectively with the second end of described second electric capacity, the negative voltage input end of described DC switch converter is connected with the first end of described 3rd electric capacity, the output terminal of described DC switch converter is connected with described second end of the 3rd electric capacity and the first output terminal of described photoelectrical coupler respectively, the feedback end of described DC switch converter is connected with the second output terminal of described photoelectrical coupler.
Beneficial effect of the present invention is:
The low side decompression transducer configuration that the present invention is applicable to the constant-current drive circuit of LED display can provide 130mA steady current and 70V VD under the AC-input voltage of 90V to 132V, applicable driving must adopt constant-current driving LED screen, first electric capacity reduces the electromagnetic interference (EMI) of conduction, bridge rectifier circuit provides full-wave rectification, second electric capacity keeps stable DC bus voltage, adopts this circuit effectively can ensure the normal display of LED screen.
Accompanying drawing explanation
Fig. 1 is the circuit diagram that the present invention is applicable to the constant-current drive circuit of LED display.
Embodiment
Below in conjunction with accompanying drawing, the invention will be further described:
As shown in Figure 1, the present invention is applicable to the constant-current drive circuit of LED display, comprise the first resistance R1 to the 4th resistance R4, first electric capacity C1 is to the 5th electric capacity C5, diode VD, first voltage stabilizing diode ZD1, second voltage stabilizing diode ZD2, photoelectrical coupler OC, DC switch converter KS and bridge rectifier circuit BR, the first end of the 5th electric capacity C5 is connected with first ac input end of bridge rectifier circuit BR and connects positive voltage, second end of the 5th electric capacity C5 is connected with second ac input end of bridge rectifier circuit BR and connects negative voltage, the cathode output end of bridge rectifier circuit BR respectively with the first end of the second electric capacity C2, the negative pole of diode VD, the first end of the first electric capacity C1, the negative pole of the first voltage stabilizing diode ZD1, the first end of the 4th electric capacity C4 is connected with the first end of the first resistance R1, the first end of the first resistance R1 is driving circuit positive voltage output end, the positive pole of diode VD is connected with the first end of inductance and the positive voltage input end of DC switch converter KS respectively, the positive pole of the first voltage stabilizing diode ZD1 is connected with the negative pole of the second voltage stabilizing diode ZD2, the positive pole of the second voltage stabilizing diode ZD2 is connected with the first end of the second resistance R2, second end of the second resistance R2 respectively with second end of the 4th electric capacity C4, the first end of the 3rd resistance R3 is connected with the first input end of photoelectrical coupler OC, second end of the first resistance R1 is connected with second end of the 3rd resistance R3 and the first end of the 4th resistance R4 respectively, second end of the first resistance R1 is driving circuit negative voltage output terminal, second end of inductance respectively with second end of the first electric capacity C1, second end of the 4th resistance R4 is connected with second input end of photoelectrical coupler OC, the cathode voltage output terminal of bridge rectifier circuit BR respectively with second end of the second electric capacity C2, the negative voltage input end of DC switch converter KS is connected with the first end of the 3rd electric capacity C3, the output terminal of DC switch converter KS is connected with second end of the 3rd electric capacity C3 and first output terminal of photoelectrical coupler OC respectively, the feedback end of DC switch converter KS is connected with second output terminal of photoelectrical coupler OC.
The principle of work that the present invention is applicable to the constant-current drive circuit of LED display is as follows:
The model of DC switch converter KS is LNK306PN.The low side decompression transducer configuration of this driving circuit can provide 130mA steady current and 70V VD under the AC-input voltage of 90V to 132V, applicable driving must adopt constant-current driving LED screen, first electric capacity C1 reduces the electromagnetic interference (EMI) of conduction, bridge rectifier circuit BR provide full-wave rectification, second electric capacity C2 keeps stable DC bus voltage, adopts this circuit effectively can ensure the normal display of LED screen.
Claims (1)
1. one kind is applicable to the constant-current drive circuit of LED display, it is characterized in that: comprise the first resistance to the 4th resistance, first electric capacity is to the 5th electric capacity, diode, first voltage stabilizing diode, second voltage stabilizing diode, photoelectrical coupler, DC switch converter and bridge rectifier circuit, the described first end of the 5th electric capacity is connected with the first ac input end of described bridge rectifier circuit and connects positive voltage, described second end of the 5th electric capacity is connected with the second ac input end of described bridge rectifier circuit and connects negative voltage, the cathode output end of described bridge rectifier circuit respectively with the first end of described second electric capacity, the negative pole of described diode, the first end of described first electric capacity, the negative pole of described first voltage stabilizing diode, the first end of described 4th electric capacity is connected with the first end of described first resistance, the first end of described first resistance is driving circuit positive voltage output end, the positive pole of described diode is connected with the first end of described inductance and the positive voltage input end of described DC switch converter respectively, the positive pole of described first voltage stabilizing diode is connected with the negative pole of described second voltage stabilizing diode, the positive pole of described second voltage stabilizing diode is connected with the first end of described second resistance, second end of described second resistance respectively with the second end of described 4th electric capacity, the first end of described 3rd resistance is connected with the first input end of described photoelectrical coupler, second end of described first resistance is connected with the second end of described 3rd resistance and the first end of described 4th resistance respectively, second end of described first resistance is driving circuit negative voltage output terminal, second end of described inductance respectively with the second end of described first electric capacity, described second end of the 4th resistance is connected with the second input end of described photoelectrical coupler, the cathode voltage output terminal of described bridge rectifier circuit respectively with the second end of described second electric capacity, the negative voltage input end of described DC switch converter is connected with the first end of described 3rd electric capacity, the output terminal of described DC switch converter is connected with described second end of the 3rd electric capacity and the first output terminal of described photoelectrical coupler respectively, the feedback end of described DC switch converter is connected with the second output terminal of described photoelectrical coupler.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310557334.4A CN104637433A (en) | 2013-11-11 | 2013-11-11 | Constant-current drive circuit applicable to LED screen |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310557334.4A CN104637433A (en) | 2013-11-11 | 2013-11-11 | Constant-current drive circuit applicable to LED screen |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104637433A true CN104637433A (en) | 2015-05-20 |
Family
ID=53216120
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310557334.4A Pending CN104637433A (en) | 2013-11-11 | 2013-11-11 | Constant-current drive circuit applicable to LED screen |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104637433A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105913795A (en) * | 2016-06-03 | 2016-08-31 | 苏州研工电子科技有限公司 | Novel constant current source |
| CN110708809A (en) * | 2019-11-08 | 2020-01-17 | 深圳市德普微电子有限公司 | Constant current source generating circuit of common-anode LED display screen driving chip |
-
2013
- 2013-11-11 CN CN201310557334.4A patent/CN104637433A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105913795A (en) * | 2016-06-03 | 2016-08-31 | 苏州研工电子科技有限公司 | Novel constant current source |
| CN110708809A (en) * | 2019-11-08 | 2020-01-17 | 深圳市德普微电子有限公司 | Constant current source generating circuit of common-anode LED display screen driving chip |
| CN110708809B (en) * | 2019-11-08 | 2021-07-23 | 四川遂宁市利普芯微电子有限公司 | Constant current source generating circuit of common-anode LED display screen driving chip |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104637433A (en) | Constant-current drive circuit applicable to LED screen | |
| CN203799627U (en) | STOD03ASchip based AMOLED (Active-matrix Organic Light Emitting Diode) display screen power supply driving module | |
| CN205540558U (en) | DC power supply on -off controller | |
| CN204119612U (en) | 10w led drive circuit | |
| CN205070393U (en) | Industrial equipment overvoltage protection control circuit | |
| CN203522295U (en) | Charger based on USB interface | |
| CN203086369U (en) | PFC boost circuit | |
| CN203233312U (en) | Switch power supply controller and switch power supply device | |
| CN203573240U (en) | Power circuit applicable to computer | |
| CN206004961U (en) | A kind of Internet of Things light fixture constant-current driving control circuit | |
| CN203967980U (en) | Switching power circuit and supply unit | |
| CN205319950U (en) | Computer power supply | |
| CN203164863U (en) | Automatic switching device of high-voltage low-voltage input | |
| CN204119573U (en) | 5w led drive circuit | |
| CN205160369U (en) | Power step -down control circuit | |
| CN204497983U (en) | The bistable volt circuit of two output voltages is processed in a kind of digital watermarking equipment | |
| CN204257315U (en) | A kind of intelligent magnetising or demagnetising apparatus of nanometer two-phase magnetic material | |
| CN204993065U (en) | Energy repayment current mode self -driven rectifier circuit | |
| CN203261508U (en) | Constant-power LED power supply circuit | |
| CN203180771U (en) | Reader-writer power source used in RFID monitoring management system | |
| CN209627222U (en) | A kind of New IGBT driver circuit system | |
| CN201562409U (en) | Eco-drive display | |
| CN203563041U (en) | One-key startup and shutdown device for intelligent electronic white board | |
| CN201910226U (en) | Displayer for driving backlight and main board by USB (Universal Serial Bus) interface power supply of PC (Personal Computer) machine | |
| CN208954359U (en) | A kind of novel interactive instructional device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20150520 |