CN205082011U - Frequency adaptive LED lamp driving circuit - Google Patents
Frequency adaptive LED lamp driving circuit Download PDFInfo
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- CN205082011U CN205082011U CN201520815855.XU CN201520815855U CN205082011U CN 205082011 U CN205082011 U CN 205082011U CN 201520815855 U CN201520815855 U CN 201520815855U CN 205082011 U CN205082011 U CN 205082011U
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Abstract
The utility model discloses a frequency adaptive LED lamp driving circuit, including the first second drive branch road that drives branch road and applicable high frequency that sets up the applicable low frequency between power and LED, first drive branch road and second drive are propped up and are equipped with change over switch on the road, still be equipped with with the frequency detection circuitry who detects mains frequency, frequency detection circuitry has the signal output part who links to each other with the change over switch control end. The utility model discloses frequency adaptive LED lamp driving circuit through the frequency detection, can come the power supply that the automatic switch -over is corresponding through the frequency of test input terminal voltage. No matter adorn and can all normally work to required which kind of frequency mode, to manufacture factory if production specification just can, guarantee safe and reliable without manual identification. When installing in addition.
Description
Technical field
The utility model relates to lighting field, particularly relates to the drive circuit of a kind of LED.
Background technology
The application of current LED fluorescent lamp tube gets more and more, and can run into two kinds of conditions in the process of actual installation fluorescent tube, and a kind of is the new user installed, directly the two ends of receiving LED fluorescent lamp tube of civil power 90-305VAC; Another kind of situation be user before be common fluorescent tube, so fluorescent tube is connected on after electric ballast, and it is the high frequency voltage that can produce 80 ~ 200V, a more than 20KHZ that electric ballast normally works.
Chinese patent application 201210248617.6 discloses a kind of LED daylight lamp power supply of compatible fluorescent lamp ballast, comprise rectification module, fluorescent lamp ballast discrimination module and power factor correction and constant-current control module, described rectification module, described fluorescent lamp ballast discrimination module is connected with constant-current control module successively with described power factor correction, described rectification module is used for converting electric main to direct current, then described direct current is outputted to described fluorescent lamp ballast discrimination module, the fluorescent lamp ballast that described fluorescent lamp ballast discrimination module is used for connecting distinguishes and described direct current is outputted to described power factor correction and constant-current control module, described power factor correction and constant-current control module are for carrying out power factor correction and exporting constant direct current.
Chinese patent application 201410432721.X discloses a kind of LED light source load detecting circuit of electric ballast, comprises electric ballast, is converted into the secondary rectification filtering module of direct voltage for the alternating voltage exported by electric ballast, is used for providing the LED illumination module of LED light source load, is used for LED illumination module output current being converted to the LED current control module that voltage also amplifies, the LED current detection indicating module being used for showing LED light source load current detection result; Described electric ballast, secondary rectification filtering module, LED illumination module, LED current control module and LED current detect indicating module and connect successively.Need not transform home circuit, when original electronic ballast circuit is not transformed, this testing circuit can detect that the electricity-saving lamp LED light source load that will substitute replaces, and needs the LED illuminating product of great output current; Detect that the electric ballast of different model needs much electric current LED illuminating products to replace.
Chinese patent application 201020049883.2 discloses a kind of LED lamp tube that can be applicable to various straight lamp brackets, belongs to Frame lamp and LED lighting field.In order to solve coupling in LED lamp tube and straight lamp brackets between various ballast and mains supply and interchangeability problem, be provided with the passive component network of adaptive electric ballast output characteristic, supply frequency sampling identification circuit and drive circuit, and make the electric current flowing through LED lamp panel equal with fluorescent tube rated operational current numerical value, and the pressure drop at LED lamp panel two ends, be between 1/3rd and 2/3rds of fluorescent tube nominal operation pipe pressure numerical value, above method makes LED lamp tube may be used on various straight lamp brackets.
Above technology improves the applicability of LED to existing line, if the recognition function that LED daylight lamp is not correlated with, way so before client is with manually switching over corresponding high frequency input and the input of low frequency civil power respectively of two power supply, light LED lamp bead by capacitance-resistance voltage reduction circuit when input is high frequency voltage, light LED lamp bead by AC/DC constant-current supply when input is low frequency civil power. but there is certain risk in this way, if operating personnel's misoperation will cause light fixture to damage the personal injury accident more likely causing electric shock.
Utility model content
The utility model provides a kind of LED lamp drive circuit of frequency self-adaption, and by frequency detecting, can be automatically switched by the frequency detecting input terminal voltage corresponding power supply.
A kind of LED lamp drive circuit of frequency self-adaption, comprise first of the low frequency that is suitable for be arranged between power supply and LED to drive branch road and be suitable for the second driving branch road of high frequency, described first drives branch road and second to drive branch road to be provided with diverter switch, also be provided with the frequency detection circuit with detecting supply frequency, described frequency detection circuit has the signal output part be connected with diverter switch control end.
Low frequency of the present utility model and high frequency are comparatively speaking, and general civil power can be considered low frequency, and through electric ballast export can be considered high frequency.According to different frequencies, the utility model automatically can be selected to be suitable for first of low frequency and drive branch road or be suitable for second of high frequency and drive branch road to carry out driving LED lamp.First drives branch road and second to drive branch road all can adopt prior art.
Such as, described first drives branch road to be AC/DC constant-current drive circuit, and described second drives branch road to be resistance-capacitance depressurization current-limiting drive circuit.
As preferably, described first drives branch road and second to drive the diverter switch on branch road to be arrange respectively or the relay of integrated setting; The normally-closed contact access second of its repeat circuit drives branch road, and the normally opened contact access first of relay drives branch road.
Because second drives branch road to be suitable for high frequency, therefore by the normally-closed contact of its cut-in relay, LED can be protected when initially powering on.Diverter switch is driven to do corresponding start according to the result of frequency detecting more afterwards.
Described frequency detection circuit comprises the rectification circuit be connected with power supply, the pressure sampling circuit be connected with rectification circuit output end and receives to go forward side by side the testing circuit that line frequency detects from pressure sampling circuit signal.
High pass or low-pass filter circuit such as can be adopted to qualitatively judge frequency, and export corresponding control signal to diverter switch, frequency detecting is periodic, wherein delay circuit can be provided with, only have the judgement conclusion in several cycles continuously identical, just export corresponding control signal to diverter switch, to avoid frequent or inappropriate switching by noise impact.
Testing circuit detects frequency and whether is greater than 1KHz, if be greater than 1KHz, is then designated as 0, if be less than 1KHz, is then designated as 1, but have 4 rising edges continuously, namely trigger diverter switch.As preferably, between described power supply and rectification circuit, be provided with capacitance.
As preferably, described rectification circuit output end is connected with testing circuit feeder ear, is also connected with voltage stabilizing circuit at testing circuit feeder ear.
Described voltage stabilizing circuit is be connected in parallel on buffer capacitor between testing circuit feeder ear and ground and voltage stabilizing didoe.
As preferably, described first drives branch road and second to drive the diverter switch on branch road to be the relay of integrated setting, and the control coil of relay is in series with the switch being controlled by frequency detection circuit signal output part.
Namely switching first by same relay linkage drives branch road and second to drive branch road, and simplify control circuit, reliability is higher.
As preferably, the control coil of described relay is parallel with protective circuit.
Described protective circuit comprises the voltage stabilizing didoe in parallel with the control coil of relay and electric capacity.
The LED lamp drive circuit of the utility model frequency self-adaption, by frequency detecting, can be automatically switched by the frequency detecting input terminal voltage corresponding power supply.No matter which kind of frequency mode dress corresponds to can normally work, as long as just passable for producing a kind of specification manufacturer, without manual identified when installing in addition. guarantee safe and reliable.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the utility model LED lamp drive circuit.
Embodiment
See Fig. 1, in the utility model embodiment, a kind of LED lamp drive circuit of frequency self-adaption, comprise first of the low frequency that is suitable for be arranged between power supply L, N and LED to drive branch road A and be suitable for the second driving branch road B of high frequency, first drives branch road A and second to drive the output of branch road B to connect LED respectively.
Frequency detection circuit C is used for detecting supply frequency; diverter switch adopts relay; wherein normally opened contact K1 accesses first and drives branch road A; normally-closed contact K2 accesses second and drives branch road B; the control coil K of relay is in series with switching tube Q1 and is controlled by frequency detection circuit C, and control coil K is parallel with voltage stabilizing didoe ZD1 and electric capacity C2 in addition as protection.
First drives branch road A to adopt AC/DC constant-current drive circuit (built-in driving chip IC2), and second drives branch road B to be resistance-capacitance depressurization current-limiting drive circuit (being realized by electric capacity C4), all with rectification function.
Frequency detection circuit C comprises to be connected with power supply capacitance C1 and rectification circuit, pressure sampling circuit R1 and pressure sampling circuit R2 is serially connected with between rectification circuit output end and ground, be that sampled point is connected with the input (FQ pin) of detection chip IC1 between pressure sampling circuit R1 and pressure sampling circuit R2, this detection chip IC1 also has the GND pin of ground connection, and as the GATE pin exported.
Rectification circuit output end is connected with the feeder ear (VCC pin) of detection chip IC1 by a diode, between detection chip IC1 feeder ear and ground, be also connected with voltage stabilizing circuit.Voltage stabilizing circuit is buffer capacitor C3 in parallel and voltage stabilizing didoe ZD2.
The LED lamp drive circuit course of work of the utility model frequency self-adaption is as follows:
When powering on, have normally-closed contact K2 conducting, therefore second drive branch road B conducting, the rectification circuit conducting simultaneously in frequency detection circuit C is powered to detection chip IC1.
Detection chip IC1 samples at sampled point the judgement of laggard line frequency, arranges, only have the judgement conclusion in several cycles continuously identical, just export corresponding control signal to diverter switch in detection chip IC1 with time delay.
If judged result is high frequency mode, it is constant that this continues latching relay state, drives branch road B to continue to power to LED by second.
If judged result is low frequency mode, then trigger switch pipe Q1 makes normally opened contact K1 and normally-closed contact K2 change state by control coil K, now first drives branch road A conducting to power to LED.
Claims (9)
1. the LED lamp drive circuit of a frequency self-adaption, comprise first of the low frequency that is suitable for be arranged between power supply and LED to drive branch road and be suitable for the second driving branch road of high frequency, described first drives branch road and second to drive branch road to be provided with diverter switch, it is characterized in that, also be provided with the frequency detection circuit with detecting supply frequency, described frequency detection circuit has the signal output part be connected with diverter switch control end.
2. the LED lamp drive circuit of frequency self-adaption as claimed in claim 1, is characterized in that, described first drives branch road to be AC/DC constant-current drive circuit, and described second drives branch road to be resistance-capacitance depressurization current-limiting drive circuit.
3. the LED lamp drive circuit of frequency self-adaption as claimed in claim 1, is characterized in that, described first drives branch road and second to drive the diverter switch on branch road to be arrange respectively or the relay of integrated setting; The normally-closed contact access second of its repeat circuit drives branch road, and the normally opened contact access first of relay drives branch road.
4. the LED lamp drive circuit of frequency self-adaption as claimed in claim 1, it is characterized in that, described frequency detection circuit comprises the rectification circuit be connected with power supply, the pressure sampling circuit be connected with rectification circuit output end and receives to go forward side by side the testing circuit that line frequency detects from pressure sampling circuit signal.
5. the LED lamp drive circuit of frequency self-adaption as claimed in claim 4, is characterized in that, between described power supply and rectification circuit, be provided with capacitance.
6. the LED lamp drive circuit of frequency self-adaption as claimed in claim 4, it is characterized in that, the output of described rectification circuit is connected with testing circuit feeder ear, is also connected with voltage stabilizing circuit at testing circuit feeder ear.
7. the LED lamp drive circuit of frequency self-adaption as claimed in claim 6, is characterized in that, described voltage stabilizing circuit is be connected in parallel on buffer capacitor between testing circuit feeder ear and ground and voltage stabilizing didoe.
8. the LED lamp drive circuit of frequency self-adaption as claimed in claim 1, it is characterized in that, described first drives branch road and second to drive the diverter switch on branch road to be the relay of integrated setting, and the control coil of relay is in series with the switch being controlled by frequency detection circuit signal output part.
9. the LED lamp drive circuit of frequency self-adaption as claimed in claim 8, it is characterized in that, the control coil of described relay is parallel with protective circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520815855.XU CN205082011U (en) | 2015-10-20 | 2015-10-20 | Frequency adaptive LED lamp driving circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520815855.XU CN205082011U (en) | 2015-10-20 | 2015-10-20 | Frequency adaptive LED lamp driving circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205082011U true CN205082011U (en) | 2016-03-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520815855.XU Active CN205082011U (en) | 2015-10-20 | 2015-10-20 | Frequency adaptive LED lamp driving circuit |
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| CN (1) | CN205082011U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105282930A (en) * | 2015-10-20 | 2016-01-27 | 晨辉光宝科技有限公司 | Frequency adaptive LED lamp drive circuit |
| CN106028518A (en) * | 2016-06-14 | 2016-10-12 | 上海芯迈科技有限公司 | LED linear drive topology |
-
2015
- 2015-10-20 CN CN201520815855.XU patent/CN205082011U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105282930A (en) * | 2015-10-20 | 2016-01-27 | 晨辉光宝科技有限公司 | Frequency adaptive LED lamp drive circuit |
| WO2017067144A1 (en) * | 2015-10-20 | 2017-04-27 | 晨辉光宝科技有限公司 | Frequency adaptive led lamp drive circuit |
| CN105282930B (en) * | 2015-10-20 | 2018-10-02 | 晨辉光宝科技有限公司 | A kind of LED lamp drive circuit that frequency is adaptive |
| CN106028518A (en) * | 2016-06-14 | 2016-10-12 | 上海芯迈科技有限公司 | LED linear drive topology |
| CN106028518B (en) * | 2016-06-14 | 2017-12-19 | 上海芯迈科技有限公司 | A kind of LED linear driving topology |
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| C14 | Grant of patent or utility model | ||
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Address after: Xie Tang Morninghope Shangyu District Industrial Park 312369 Zhejiang city of Shaoxing Province Patentee after: Chenhuangbao Technology Co., Ltd. Address before: Xie Tang Morninghope Shangyu District Industrial Park 312369 Zhejiang city of Shaoxing Province Patentee before: CHENHUI GUANGBAO TECHNOLOGY CO., LTD. |