CN201601859U - Non-isolated LED driving circuit - Google Patents
Non-isolated LED driving circuit Download PDFInfo
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- CN201601859U CN201601859U CN2009202973236U CN200920297323U CN201601859U CN 201601859 U CN201601859 U CN 201601859U CN 2009202973236 U CN2009202973236 U CN 2009202973236U CN 200920297323 U CN200920297323 U CN 200920297323U CN 201601859 U CN201601859 U CN 201601859U
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Abstract
The utility model discloses a non-isolated LED driving circuit, mainly consisting of an integrated circuit chip U and a load LED, which is characterized in that: an anode of the load LED is connected with an output anode of an AC rectification circuit, and the cathode of the load LED is connected with the integrated circuit chip U through an inductor L1. The AC rectification circuit is also connected with the integrated circuit chip U through a DC output circuit and a potentiometer R1; an anode of a diode D1 is connected with the integrated circuit chip U and the inductor L1, and a cathode of the diode D1 is connected with the anode of the load LED. The whole circuit structure of the utility model is in a non-isolated structure without using the traditional transformer and photoelectric coupler. Therefore, the utility model obviously simplifies the circuit structure, improves the circuit performance, and also reduces the manufacturing cost and maintenance cost.
Description
Technical field
The utility model relates to a kind of drive circuit, specifically is meant a kind of non-isolated led drive circuit.
Background technology
Since this century, more powerful light-emitting diode (LED) more and more is widely used in various illuminations and high brightness shows the place, for example room lighting, venue illumination, demonstration wall, traffic lights, tunnel illumination, mine lighting etc.Compare with common lighting apparatus, the required power supply of driving LED (or claiming to light LED) is different with the power supply that drives general lighting equipment, the required power supply of general lighting equipment is voltage stabilizing output, electric current changes below maximum, and driving LED needs power supply constant current output usually, and voltage changes below peak.
Represent AC-powered (220VAC for example with AC, 50Hz), represent direct current of voltage regulation with DC, the constant current direct current of representing driving LED with CC, then the power supply circuits scheme roughly is divided into two classes: the first kind is the AC/DC+DC/CC power supply circuits, second class then is the AC/CC power supply circuits, and wherein second class can be divided into two classes again, and is promptly isolated and non-isolated.Common led drive circuit as shown in Figure 1, owing to want driving LED, therefore also need increase the circuit of " measuring the output current size " in D1 and the C3 output stage of the transformer T1 of this led drive circuit, simultaneously in order to increase the circuit that this " measures the output current size ", also needing increases a winding to transformer T1, thereby is made into separate AC/CC power supply circuits.Therefore, when adopting technology shown in Figure 1 to come driving LED, its circuit structure is complicated, and maintenance and cost of manufacture are higher, are unfavorable for extensive promotion and application.
The utility model content
The purpose of this utility model is to overcome the circuit structure complexity of present driving LED, and maintenance and the higher defective of cost of manufacture provide a kind of not only circuit structure simple, and maintenance and the lower non-isolated led drive circuit of cost of manufacture.
The purpose of this utility model is achieved through the following technical solutions: a kind of non-isolated led drive circuit, mainly form by integrated circuit (IC) chip U and load LED, the anode of this load LED is connected with the output cathode of ac rectifier, and its negative electrode is connected with integrated circuit (IC) chip U through inductor L1; This ac rectifier also is connected with integrated circuit (IC) chip U behind dc output circuit and potentiometer R1; The anode of diode D1 is connected with integrated circuit (IC) chip U and inductor L1, and its negative electrode is connected with the anode of load LED.
Further, described ac rectifier is, the end of capacitor C3 is connected with the input I end of rectifier bridge D4 behind inductor L2, and the other end of capacitor C3 is connected with the input II end of rectifier bridge D4 behind fuse F1; The cathode output end of rectifier bridge D4 is connected with the cathode output end of rectifier bridge D4 behind capacitor C2, and the cathode output end ground connection of rectifier bridge D4; Between the input I of rectifier bridge D4 end and input II end, also be connected with capacitor C4.
Described dc output circuit is, an end of resistor R 2 is connected with the input II of rectifier bridge D4 end, and its other end is connected with the negative electrode of diode D2 behind capacitor C5; The anode of diode D2 connects and is connected with the cathode output end of rectifier bridge D4, and its negative electrode is connected with the anode of diode D3; The negative electrode of diode D3 is connected through the negative electrode of resistor R 3 with diode D5, and the anode of diode D5 is connected with the GND end of integrated circuit (IC) chip U and the cathode output end of rectifier bridge D4; The negative electrode of diode D3 is connected with the cathode output end of rectifier bridge D4 behind capacitor C6, and the negative electrode of this diode D3 also directly is connected with the VCC end of integrated circuit (IC) chip U.
The end of described potentiometer R1 is connected with the COMP end of integrated circuit (IC) chip U after resistor R 4, and the other end of this potentiometer R1 then is connected with the negative electrode of diode D5.Between the input of load LED and output, also be connected with capacitor C1.
In order to ensure result of use, the model of described integrated circuit (IC) chip U is AP8012, AP8022 or VIPer22x.
Described diode D1 is a fast recovery diode, and described diode D5 is a voltage stabilizing didoe.
The utility model is compared than prior art, has the following advantages and beneficial effect:
(1) entire circuit structure of the present utility model is non-isolated structure, do not need to use traditional transformer and photoelectrical coupler, therefore the utility model has not only significantly been simplified circuit structure, has improved the performance of circuit, but also has reduced cost of manufacture and maintenance cost.
(2) when cooperating suitable load LED, the utility model can not only substitute traditional incandescent lamp, but also can replace fluorescent lamps and ballast thereof, so practicality is very strong.
Description of drawings
Fig. 1 is the electrical block diagram of prior art.
Fig. 2 is an overall structure block diagram of the present utility model.
Fig. 3 is an electrical block diagram of the present utility model.
Embodiment
Below in conjunction with embodiment and accompanying drawing, the utility model is described in further detail, but execution mode of the present utility model is not limited thereto.
As shown in Figure 1, existing led drive circuit mainly is made up of rectification circuit, integrated circuit (IC) chip U, transformer T1 and photoelectrical coupler.As shown in the figure, an end on the former limit of this transformer T1 is connected with the output cathode of rectification circuit, and the other end on former limit is connected with integrated circuit U; The secondary of transformer T1 connects diode and capacitor etc., the VCC end of corresponding connection integrated circuit U and the O1D end of photoelectrical coupler; Another secondary of transformer T1 connects diode D1 and capacitor C3 etc., the O1E end of corresponding connection load LED and photoelectrical coupler.
Because when providing constant current to LED, its architectural characteristic far can not satisfy this requirement, therefore also must increase the circuit of " measuring the output current size " in D1 and the C3 output stage of transformer T1, thereby cause this circuit structure complicated more, be unfavorable for safeguarding and making, and its impact of performance is also poor.
Shown in Fig. 2,3, ac rectifier of the present utility model is used to export high voltage direct current, dc output circuit then is used to export DC low current, and integrated circuit (IC) chip U then adopts more common integrated circuit, is the integrated circuit of AP8012, AP8022 or VIPer22x as model.In order to regulate the output current peak value of integrated circuit (IC) chip U, this integrated circuit (IC) chip U also is connected with potentiometer R1.
During connection, this ac rectifier has an end to be connected with integrated circuit (IC) chip U behind dc output circuit and potentiometer R1, simultaneously, the output cathode of this ac rectifier then is connected with the anode of load LED, so that provide electric energy for the operate as normal of load LED.Simultaneously, the negative electrode of this load LED also is connected with integrated circuit (IC) chip U through inductor L1, and between the other end of the anode of load LED and inductor L1, also be connected with fast recovery diode D1, promptly load LED be in parallel with fast recovery diode D1 again after inductor L1 connects.In order to reduce the ripples electric current of load LED, two ends at load LED also are parallel with capacitor C1, the anode that is load LED is connected with the cathode output end of rectifier bridge D4, the negative electrode of load LED is connected with the SW end of integrated circuit (IC) chip U behind inductor L1, thereby makes this capacitor C1 and inductor L1 constitute a low pass filter together.And the anode of fast recovery diode D1 is connected with the SW end of integrated circuit (IC) chip U, and its negative electrode is connected with the cathode output end end of rectifier bridge D4.Its particular circuit configurations as shown in Figure 3, promptly this ac rectifier is made up of capacitor C3, inductor L2, fuse F1, capacitor C4, rectifier bridge D4 and capacitor C2.The end of this capacitor C3 is connected with the input I end of rectifier bridge D4 through inductor L2, and the other end of capacitor C3 then is connected to the input II end of rectifier bridge D4 behind fuse F1.Simultaneously, the two ends of this capacitor C3 also are connected with the connector AC that is used for the alternating current input.
Between the input II of the input I of rectifier bridge D4 end and rectifier bridge D4 end, also be connected with capacitor C4, the cathode output end of rectifier bridge D4 is connected with the positive pole of capacitor C2, the negative pole of capacitor C2 then is connected with the cathode output end of rectifier bridge D4, and defines this negative pole for partly.
Dc output circuit is then by resistor R 2 and R3, capacitor C5 and C6, and diode D2 and D3 and voltage stabilizing didoe D5 form.During connection, an end of resistor R 2 is connected with the input II of rectifier bridge D4 end, and the other end of resistor R 2 then is connected to the anode of diode D3 behind capacitor C5.The negative electrode of diode D2 directly is connected with the anode of diode D3, and simultaneously, the anode of this diode D2 also is connected with the cathode output end of rectifier diode D4, and promptly the anode of this diode D2 connects partly.
The negative electrode of diode D3 is divided into two-way, and one the tunnel is connected through the negative electrode of resistor R 3 with voltage stabilizing didoe D5, and the positive pole of another Lu Zeyu capacitor C6 is connected, and the negative pole of capacitor C6 connects partly.Simultaneously, the negative electrode of diode D3 also directly is connected with the VCC end of integrated circuit (IC) chip U.Regulate for the ease of output current peak value, realize the function of regulating load LED brightness, on integrated circuit (IC) chip U, also be connected with potentiometer R1, promptly regulate its output current by the resistance of regulating this potentiometer R1 to integrated circuit (IC) chip U.During connection, the end of this potentiometer R1 is connected with the negative electrode of voltage stabilizing didoe D5, and the other end of potentiometer R1 then is connected with the COMP end of integrated circuit (IC) chip U after resistor R 4.The GND end of integrated circuit (IC) chip U also links to each other with the anode of voltage stabilizing didoe D5, and this GND end all connects partly.
As mentioned above, just can realize the utility model preferably.
Claims (8)
1. a non-isolated led drive circuit mainly is made up of integrated circuit (IC) chip U and load LED, it is characterized in that: the anode of this load LED is connected with the output cathode of ac rectifier, and its negative electrode is connected with integrated circuit (IC) chip U through inductor L1; This ac rectifier also is connected with integrated circuit (IC) chip U behind dc output circuit and potentiometer R1; The anode of diode D1 is connected with integrated circuit (IC) chip U and inductor L1, and its negative electrode is connected with the anode of load LED.
2. a kind of non-isolated led drive circuit according to claim 1, it is characterized in that: described ac rectifier is, the end of capacitor C3 is connected with the input I end of rectifier bridge D4 behind inductor L2, and the other end of capacitor C3 is connected with the input II end of rectifier bridge D4 behind fuse F1; The cathode output end of rectifier bridge D4 is connected with the cathode output end of rectifier bridge D4 behind capacitor C2, and the cathode output end ground connection of rectifier bridge D4; Between the input I of rectifier bridge D4 end and input II end, also be connected with capacitor C4.
3. a kind of non-isolated led drive circuit according to claim 2, it is characterized in that: described dc output circuit is, one end of resistor R 2 is connected with the input II of rectifier bridge D4 end, and its other end is connected with the negative electrode of diode D2 behind capacitor C5; The anode of diode D2 connects and is connected with the cathode output end of rectifier bridge D4, and its negative electrode is connected with the anode of diode D3; The negative electrode of diode D3 is connected through the negative electrode of resistor R 3 with diode D5, and the anode of diode D5 is connected with the GND end of integrated circuit (IC) chip U and the cathode output end of rectifier bridge D4; The negative electrode of diode D3 is connected with the cathode output end of rectifier bridge D4 behind capacitor C6, and the negative electrode of this diode D3 also directly is connected with the VCC end of integrated circuit (IC) chip U.
4. a kind of non-isolated led drive circuit according to claim 3, it is characterized in that: the end of described potentiometer R1 is connected with the COMP end of integrated circuit (IC) chip U after resistor R 4, and the other end of this potentiometer R1 then is connected with the negative electrode of diode D5.
5. a kind of non-isolated led drive circuit according to claim 1 is characterized in that: also be connected with capacitor C1 between the input of load LED and output.
6. according to each described a kind of non-isolated led drive circuit of claim 1～5, it is characterized in that: the model of described integrated circuit (IC) chip U is AP8012, AP8022 or VIPer22x.
7. a kind of non-isolated led drive circuit according to claim 6 is characterized in that: described diode D1 is a fast recovery diode.
8. a kind of non-isolated led drive circuit according to claim 3 is characterized in that: described diode D5 is a voltage stabilizing didoe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202973236U CN201601859U (en) | 2009-12-17 | 2009-12-17 | Non-isolated LED driving circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202973236U CN201601859U (en) | 2009-12-17 | 2009-12-17 | Non-isolated LED driving circuit |
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| Publication Number | Publication Date |
|---|---|
| CN201601859U true CN201601859U (en) | 2010-10-06 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009202973236U Expired - Fee Related CN201601859U (en) | 2009-12-17 | 2009-12-17 | Non-isolated LED driving circuit |
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| Country | Link |
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| CN (1) | CN201601859U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103595083A (en) * | 2013-06-07 | 2014-02-19 | 漳州师范学院 | Desktop type general optical coupling wireless charger and application thereof |
| CN108471654A (en) * | 2018-05-03 | 2018-08-31 | 海宁福得电器有限公司 | A kind of anti-glimmer non-isolation type driving LED ceiling lamp tool |
-
2009
- 2009-12-17 CN CN2009202973236U patent/CN201601859U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103595083A (en) * | 2013-06-07 | 2014-02-19 | 漳州师范学院 | Desktop type general optical coupling wireless charger and application thereof |
| CN103595083B (en) * | 2013-06-07 | 2016-08-24 | 闽南师范大学 | A kind of desktop type general optical coupling wireless charger and application thereof |
| CN108471654A (en) * | 2018-05-03 | 2018-08-31 | 海宁福得电器有限公司 | A kind of anti-glimmer non-isolation type driving LED ceiling lamp tool |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20101006 Termination date: 20121217 |