CN202857064U - Novel wide-input-voltage LED non-isolated single-chip constant-current drive circuit - Google Patents
Novel wide-input-voltage LED non-isolated single-chip constant-current drive circuit Download PDFInfo
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- CN202857064U CN202857064U CN 201220502685 CN201220502685U CN202857064U CN 202857064 U CN202857064 U CN 202857064U CN 201220502685 CN201220502685 CN 201220502685 CN 201220502685 U CN201220502685 U CN 201220502685U CN 202857064 U CN202857064 U CN 202857064U
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Abstract
The utility model relates to a novel wide-input-voltage LED non-isolated single-chip constant-current drive circuit. The novel wide-input-voltage LED non-isolated single-chip constant-current drive circuit includes an over-voltage and over-current protection circuit, a rectifying circuit, an EMI filtering circuit, a buffering and filtering circuit, an IC chip, an IC chip peripheral circuit, a high-frequency rectifying circuit, a current-limiting circuit, an output filtering circuit and a LED array. The over-voltage and over-current protection circuit is connected with the IC chip through the rectifying circuit, the EMI filtering circuit and the buffering and filtering circuit; and the IC chip is connected with the LED array through the high-frequency rectifying circuit, the current-limiting circuit and the output filtering circuit. According to the novel wide-input-voltage LED non-isolated single-chip constant-current drive circuit of the utility model, a DU8623 chip is adopted, and unique closed-loop constant-current control technology is adopted in the internal structure of the DU8623 chip, and therefore, high-accuracy output current can be realized under the relaxed condition of peripheral inductance parameters, and the closed-loop constant-current-control internal structure is superior to a topological voltage-decreasing open-loop control structure of an existing non-isolated constant-current drive power supply. The novel wide-input-voltage LED non-isolated single-chip constant-current drive circuit of the utility model has the advantages of simple circuit, smaller dimension of a power supply, reduced cost, simple production technique, high conversion efficiency, high-precision constant current and the like.
Description
Technical field
The utility model relates to the non-isolation monolithic of a kind of new molded breadth voltage input LED constant-current drive circuit.
Background technology
In the prior art, general small-power power all demand motive chip and power MOS pipe supports the use together, has so just increased cost, and existing driving circuit structure is complicated, and production cost is high, is unfavorable for applying, and also is unfavorable for energy-conserving and environment-protective.
The utility model content
For problems of the prior art, the purpose of this utility model is to provide the technical scheme of the non-isolation monolithic of a kind of new molded breadth voltage input LED constant-current drive circuit.
The non-isolation monolithic of described new molded breadth voltage input LED constant-current drive circuit; comprise over-voltage over-current protection circuit, rectification circuit, EMI filter circuit, buffering filter circuit, IC chip, IC chip periphery circuit, high-frequency rectification circuit, current-limiting circuit, output filter circuit and led array; over-voltage over-current protection circuit links to each other with the IC chip through rectification circuit, EMI filter circuit and buffering filter circuit, and the IC chip links to each other with led array through high-frequency rectification circuit, current-limiting circuit, output filter circuit.
The non-isolation monolithic of described new molded breadth voltage input LED constant-current drive circuit, described over-voltage over-current protection circuit is comprised of overcurrent protection resettable fuse WHPTC and overvoltage protection piezo-resistance MY.
The non-isolation monolithic of described new molded breadth voltage input LED constant-current drive circuit, described rectification circuit is comprised of the rectifier bridge that diode D1-D4 consists of.
The non-isolation monolithic of described new molded breadth voltage input LED constant-current drive circuit, described EMI filter circuit is made of capacitor C 1, capacitor C 2 and inductance L 1.
The non-isolation monolithic of described new molded breadth voltage input LED constant-current drive circuit, described buffering filter circuit is made of resistance R 1, diode D5 and capacitor C 3.
The non-isolation monolithic of described new molded breadth voltage input LED constant-current drive circuit, described IC chip periphery circuit is cooperatively interacted by resistance R 2, resistance R 3, resistance R 4, resistance R 5, resistance R 6, capacitor C 4 and capacitor C 5 and forms.
The non-isolation monolithic of described new molded breadth voltage input LED constant-current drive circuit, described high-frequency rectification circuit is made of diode D6, and current-limiting circuit is comprised of inductance L 2, and output filter circuit is made of capacitor C 6.
The non-isolation monolithic of described new molded breadth voltage input LED constant-current drive circuit, described led array is formed by n LED serial connection.
The non-isolation monolithic of described new molded breadth voltage input LED constant-current drive circuit, described IC chip has adopted the DU8623 chip.
The DU8623 chip that the utility model adopts; because chip internal structure adopts unique Closed-loop Constant-current control technology; can under loose peripheral inductance parameters condition, realize high-precision output current; the topological step-down open loop control structure that is better than at present non-isolated constant-current driving power supply; because closed-loop control; circuit has possessed the inductance short circuit; current sense resistor short/open defencive function; compare open loop policy; circuit reliability has had large increase; and make many cover lamp loads overlap power supply with one; remarkable value is arranged aborning, the consistency of LED lamp brightness when guaranteeing to produce in batches.
The utlity model has following advantage: 1. circuit is simple, and 2. power volume can be accomplished littlely, 3. reduces cost, and 4. production technology is simple, and 5. conversion efficiency is high, and constant current accuracy is high.
Description of drawings
Fig. 1 is structured flowchart of the present utility model;
Fig. 2 is circuit theory diagrams of the present utility model;
Among the figure: the 1-over-voltage over-current protection circuit; The 2-rectification circuit; 3-EMI filter circuit; 4-cushions filter circuit; The 5-IC chip; The 6-high-frequency rectification circuit; The 7-current-limiting circuit; The 8-output filter circuit; The 9-LED array.
Embodiment
Below in conjunction with Figure of description the utility model is described further:
The non-isolation monolithic of new molded breadth voltage input LED constant-current drive circuit; comprise over-voltage over-current protection circuit 1, rectification circuit 2, EMI filter circuit 3, buffering filter circuit 4, IC chip 5, IC chip periphery circuit, high-frequency rectification circuit 6, current-limiting circuit 7, output filter circuit 8 and led array 9; over-voltage over-current protection circuit 1 links to each other with IC chip 5 through rectification circuit 2, EMI filter circuit 3 and buffering filter circuit 4, and IC chip 5 links to each other with led array 9 through high-frequency rectification circuit 6, current-limiting circuit 7, output filter circuit 8.
Over-voltage over-current protection circuit is comprised of overcurrent protection resettable fuse WHPTC and overvoltage protection piezo-resistance MY; rectification circuit is comprised of the rectifier bridge that diode D1-D4 consists of; the EMI filter circuit is by capacitor C 1; capacitor C 2 and inductance L 1 consist of; the buffering filter circuit is by resistance R 1; diode D5 and capacitor C 3 consist of; IC chip periphery circuit is by resistance R 2; resistance R 3; resistance R 4; resistance R 5; resistance R 6; capacitor C 4 and capacitor C 5 cooperatively interact and form; high-frequency rectification circuit is made of diode D6; current-limiting circuit is comprised of inductance L 2; output filter circuit is made of capacitor C 6, and led array is formed by n LED serial connection.
The DU8623 chip that the utility model adopts, the IC indoor design a kind of new control method, under different input voltages, the operating frequency by automatic change power supply solves this problem, and Switching Power Supply can also can be worked under wide input voltage normally.Because chip internal structure adopts unique Closed-loop Constant-current control technology; can under loose peripheral inductance parameters condition, realize high-precision output current; topological step-down open loop control structure than at present non-isolated constant-current driving power supply is also reasonable; closed-loop control; detect output current; send pwm signal; make the complete machine power supply at full voltage; full load; current precision in the inductance excursion reaches at present the highest ± 0.9% in the industry; simultaneously; because closed-loop control; circuit has possessed the inductance short circuit; current sense resistor short/open defencive function; compare and open loop policy, circuit reliability has had large increase, and makes many cover lamp loads overlap power supply with one; remarkable value is arranged aborning, the consistency of LED lamp brightness when guaranteeing to produce in batches.
Overcurrent protection resettable fuse WHPTC is connected on ac power input end; overvoltage protection piezo-resistance MY also is listed in ac power input end; export after the rectifier bridge rectification of power supply through diode D1-D4 formation; capacitor C 1 is connected in parallel on output; diode D2 output connects inductance L 1 one ends; diode D4 input is contact resistance R5 one end respectively; resistance R 6 one ends; capacitor C 2 one ends; capacitor C 3 negative poles; capacitor C 4 one ends; capacitor C 5 one ends and IC pin 2; inductance L 1 other end connects respectively capacitor C 2 other ends; resistance R 1 one ends; diode D5 negative pole; resistance R 2 one ends; capacitor C 6 one ends; the input of diode D6 negative pole and LED array; the capacitor C 3 anodal contact resistance R1 other ends and diode D5 are anodal; capacitor C 4 other ends respectively with resistance R 5 other ends; IC chip pin 3; resistance R 3 one ends; resistance R 4 one ends link to each other; resistance R 3 other end contact resistance R2 other ends; resistance R 4 other ends connect IC chip pin 4; capacitor C 5 other ends connect IC chip pin 1; resistance R 6 other ends connect IC chip pin 8; IC chip pin 5 is anodal with diode D6; inductance L 2 one ends link to each other, and inductance L 2 other ends connect respectively the negative pole of capacitor C 6 other ends and led array.
Operation principle: electric main is connected with the bridge rectifier input that is made of diode D1-D4 with overvoltage protection piezo-resistance MY through overcurrent protection resettable fuse WHPTC; carry out EMI filtering through linking to each other with the electromagnetic interface filter circuit behind the bridge rectifier of 4 rectifier diodes; it accomplishes to prevent that the civil power clutter from entering the effect that enters utility grid with the switching circuit high frequency; 1 pair of electrochemical capacitor C3 charging discharges into positive terminal by diode D5 to filtered positive electricity simultaneously through resistance R; can play buffering and discharge and recharge generation current harmonic distortion when preventing the large bulk capacitance charging; through resistance R 2; resistance R 3 is given the power supply of IC chip 3 pin power ends; 2 pin earth terminals of IC chip directly connect negative pole; IC chip 1 pin is output closed-loop Current Control compensation end and grounding connection control and compensation capacitor C 5; IC chip 4 pin are that internal high-voltage MOSFET gate terminal and IC chip 3 pin contact resistance R4 play the effect of the inner MOSFET drain electrode of control output current; IC chip 3 pin be connected with the ground connection negative pole capacitor C 3 and resistance R 5 play the IC further filter action of powering; IC chip 8 pin current sample ends and ground connection negative pole contact resistance R6 play output current constant current control action; IC chip 5 pin high pressure MODFET drain electrode ends are connected input with high-frequency rectification diode D6 positive terminal respectively and are connected with inductance L; diode D6 negative pole end links to each other with the output cathode end; high-frequency rectification and inductance L 2 current limlitings by diode D6 form the anodal output of output diode D6 negative pole end; the output of inductance L 2 negative pole of output end; parallel filtering capacitor C 6 between output cathode and output negative pole, output connects the LED load.
Claims (9)
1. new molded breadth voltage is inputted the non-isolation monolithic of LED constant-current drive circuit; it is characterized in that comprising over-voltage over-current protection circuit, rectification circuit, EMI filter circuit, buffering filter circuit, IC chip, IC chip periphery circuit, high-frequency rectification circuit, current-limiting circuit, output filter circuit and led array; over-voltage over-current protection circuit links to each other with the IC chip through rectification circuit, EMI filter circuit and buffering filter circuit, and the IC chip links to each other with led array through high-frequency rectification circuit, current-limiting circuit, output filter circuit.
2. the non-isolation monolithic of new molded breadth voltage input LED according to claim 1 constant-current drive circuit is characterized in that described over-voltage over-current protection circuit is comprised of overcurrent protection resettable fuse WHPTC and overvoltage protection piezo-resistance MY.
3. the non-isolation monolithic of new molded breadth voltage input LED according to claim 1 constant-current drive circuit is characterized in that described rectification circuit is comprised of the rectifier bridge that diode D1-D4 consists of.
4. the non-isolation monolithic of new molded breadth voltage input LED according to claim 1 constant-current drive circuit is characterized in that described EMI filter circuit is made of capacitor C 1, capacitor C 2 and inductance L 1.
5. the non-isolation monolithic of new molded breadth voltage input LED according to claim 1 constant-current drive circuit is characterized in that described buffering filter circuit is made of resistance R 1, diode D5 and capacitor C 3.
6. the non-isolation monolithic of new molded breadth voltage input LED according to claim 1 constant-current drive circuit is characterized in that described IC chip periphery circuit is cooperatively interacted by resistance R 2, resistance R 3, resistance R 4, resistance R 5, resistance R 6, capacitor C 4 and capacitor C 5 to form.
7. the non-isolation monolithic of new molded breadth voltage input LED according to claim 1 constant-current drive circuit is characterized in that described high-frequency rectification circuit is made of diode D6, and current-limiting circuit is comprised of inductance L 2, and output filter circuit is made of capacitor C 6.
8. the non-isolation monolithic of new molded breadth voltage input LED according to claim 1 constant-current drive circuit is characterized in that described led array is formed by n LED serial connection.
9. the non-isolation monolithic of new molded breadth voltage input LED according to claim 1 constant-current drive circuit is characterized in that described IC chip has adopted the DU8623 chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220502685 CN202857064U (en) | 2012-09-27 | 2012-09-27 | Novel wide-input-voltage LED non-isolated single-chip constant-current drive circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220502685 CN202857064U (en) | 2012-09-27 | 2012-09-27 | Novel wide-input-voltage LED non-isolated single-chip constant-current drive circuit |
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| CN202857064U true CN202857064U (en) | 2013-04-03 |
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| CN 201220502685 Expired - Fee Related CN202857064U (en) | 2012-09-27 | 2012-09-27 | Novel wide-input-voltage LED non-isolated single-chip constant-current drive circuit |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103427616A (en) * | 2013-08-28 | 2013-12-04 | 苏州汇川技术有限公司 | Large-size frequency converter and electrifying buffer circuit on control power supply of large-size frequency converter |
| CN104284481A (en) * | 2014-08-26 | 2015-01-14 | 上海占空比电子科技有限公司 | Bridgeless electrolytic-capacitor-free low-ripple-wave high-power constant-current power supply of LED lamp |
| CN104913208A (en) * | 2014-03-12 | 2015-09-16 | 河南新飞利照明科技有限责任公司 | Led point light source lamp |
| CN106604479A (en) * | 2017-01-23 | 2017-04-26 | 无锡恒芯微科技有限公司 | Non-isolated LED dimming circuit with PWM and DIM dimming |
-
2012
- 2012-09-27 CN CN 201220502685 patent/CN202857064U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103427616A (en) * | 2013-08-28 | 2013-12-04 | 苏州汇川技术有限公司 | Large-size frequency converter and electrifying buffer circuit on control power supply of large-size frequency converter |
| CN104913208A (en) * | 2014-03-12 | 2015-09-16 | 河南新飞利照明科技有限责任公司 | Led point light source lamp |
| CN104284481A (en) * | 2014-08-26 | 2015-01-14 | 上海占空比电子科技有限公司 | Bridgeless electrolytic-capacitor-free low-ripple-wave high-power constant-current power supply of LED lamp |
| CN106604479A (en) * | 2017-01-23 | 2017-04-26 | 无锡恒芯微科技有限公司 | Non-isolated LED dimming circuit with PWM and DIM dimming |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130403 Termination date: 20150927 |
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| EXPY | Termination of patent right or utility model |