CN2788503Y - Circuit for LED lamp - Google Patents
Circuit for LED lamp Download PDFInfo
- Publication number
- CN2788503Y CN2788503Y CN 200520102160 CN200520102160U CN2788503Y CN 2788503 Y CN2788503 Y CN 2788503Y CN 200520102160 CN200520102160 CN 200520102160 CN 200520102160 U CN200520102160 U CN 200520102160U CN 2788503 Y CN2788503 Y CN 2788503Y
- Authority
- CN
- China
- Prior art keywords
- triode
- diode
- electrode
- rectification circuit
- negative pole
- 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.)
- Expired - Fee Related
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Abstract
The utility model relates to a circuit for an LED lamp, which comprises a rectification circuit, wherein the positive electrode of the rectification circuit is connected in series with a transformer (T), and is connected with the collecting electrode of a triode (VT2); after the negative electrode is connected with a resistor (R2), the negative electrode is connected with the emitting electrode of the (VT2). After the emitting electrode is connected in series with a diode (VD5), the emitting electrode is connected with the base electrode of a triode (VT1). The emitting electrode of the (VT1) is connected with the negative electrode of the rectification circuit, and the collecting electrode is connected with the base electrode of the (VT2). A resistor (R1) is connected with the collecting electrode of the (VT1), the base electrode of the (VT2), a diode (VD7), and a resistor (R3). The (R3) is connected in series with a capacitor (C2), and then, a diode (VD6), and then, is connected in parallel with the (VD7). The (C2) and the connecting point of the (VD6) are connected with the (2) end of a primary coil (N1) of the (T), and the (1) end of the (N1) is connected with the negative electrode of the rectification circuit. The connecting points of the (VD6) and the (VD7) are connected with the negative electrode of a capacitor (C1), and the positive electrode of the (C1) is connected with the negative electrode of the rectification circuit. The (6) end of a secondary coil (N3) of the (T) is connected in series with diodes (VD8), (VD9), (VD10), the connecting points of the (VD8) and the (VD9) are connected with the positive electrode of a capacitor (C3), and the negative electrode of the (C3) is connected with the (5) end of the (N3). The utility model has the advantages of small power consumption, large voltage range and long service life.
Description
Technical field
The utility model relates to a kind of LED lamp, particularly a kind of LED lamp circuit.
Background technology
No matter existing LED lamp is though be aspect useful life, significant progress have been arranged all in luminous intensity, but still exist very big shortcoming than fluorescent lamp and other common illuminating lamps.Such as, their power consumption is bigger, and the scope of working voltage is not really broad, falls short of useful life etc.
Summary of the invention
Technical problem to be solved in the utility model be provide at above-mentioned prior art present situation that a kind of power consumption is little, the LED lamp circuit of the having a wide reach of working voltage, long service life.
The utility model solves the problems of the technologies described above the technical scheme that is adopted: a kind of LED lamp circuit, comprise the bridge rectifier of forming by diode VD1, VD2, VD3 and VD4, be connected to the collector electrode of triode VT2 after the 4-3 end of the positive pole of rectification circuit and the second primary coil N2 of transformer T is connected in series; Be connected to the negative pole of rectification circuit behind the emitter series resistor R2 of triode VT2, and receive the base stage of triode VT1 after being in series with diode VD5; The emitter of triode VT1 is received the negative pole of rectification circuit, and collector electrode is connected with the base stage of triode VT2; Be connected with collector electrode, the base stage of triode VT2, voltage stabilizing didoe VD7, the resistance R 3 of triode VT1 behind the cathode series resistance R1 of rectification circuit; In parallel with voltage stabilizing didoe VD7 again after resistance R 3 and capacitor C 2, the diode VD6 serial connection; Capacitor C 2 links to each other the negative pole of the 1 termination rectification circuit of N1 with the tie point of diode VD6 with 2 ends of the first primary coil N1 of transformer T; The tie point of diode VD6, VD7 links to each other with the negative pole of electrochemical capacitor C1, and the positive pole of capacitor C 1 connects the negative pole of rectification circuit; The 6 ends serial connection diode VD8 of the secondary coil N3 of transformer T, VD9, VD10, the tie point of diode VD8, VD9 links to each other with the positive pole of electrochemical capacitor C3, and the negative pole of C3 connects 5 ends of secondary coil N3.The 5 termination loads of the output of diode VD10 and secondary coil N3.
Compared with prior art, advantage of the present utility model is that its driving voltage is low, and electric current is little, can be between 90-240V voltage operate as normal.Use the LED lamp power consumptive province of this circuit, long service life.
Description of drawings
Fig. 1 is the structural representation of the utility model embodiment.
Embodiment
Embodiment describes in further detail the utility model below in conjunction with accompanying drawing.
As shown in Figure 1, a kind of LED lamp circuit comprises the bridge rectifier of being made up of diode VD1, VD2, VD3 and VD4, is connected to the collector electrode of triode VT2 after the 4-3 end of the positive pole of rectification circuit and the second primary coil N2 of transformer T is connected in series; Be connected to the negative pole of rectification circuit behind the emitter series resistor R2 of triode VT2, and receive the base stage of triode VT1 after being in series with diode VD5; The emitter of triode VT1 is received the negative pole of rectification circuit, and collector electrode is connected with the base stage of triode VT2; Be connected with collector electrode, the base stage of triode VT2, voltage stabilizing didoe VD7, the resistance R 3 of triode VT1 behind the cathode series resistance R1 of rectification circuit; In parallel with voltage stabilizing didoe VD7 again after resistance R 3 and capacitor C 2, the diode VD6 serial connection; Capacitor C 2 links to each other the negative pole of the 1 termination rectification circuit of N1 with the tie point of diode VD6 with 2 ends of the first primary coil N1 of transformer T; The tie point of diode VD6, VD7 links to each other with the negative pole of electrochemical capacitor C1, and the positive pole of capacitor C 1 connects the negative pole of rectification circuit; The 6 ends serial connection diode VD8 of the secondary coil N3 of transformer T, VD9, VD10, the tie point of diode VD8, VD9 links to each other with the positive pole of electrochemical capacitor C3, and the negative pole of C3 connects 5 ends of secondary coil N3.The 5 termination loads of the output of diode VD10 and secondary coil N3.
Operation principle of the present utility model is as follows:
After alternating current passes through the bridge rectifier of being made up of VD1-VD4, the output dc voltage supply control circuit.Resistance R 1 is a starting resistance, output voltage takes out the base stage that starting resistor is delivered to triode VT2, make its conducting, the collector current that produces, the second primary coil N2 of transformer T flows through, thereby inducing end of the same name in the first primary coil N1 of transformer T is positive induced voltage, this voltage is added to the base stage of triode VT2 by capacitor C 2, resistance R 3, its base current is increased, collector electrode electric current thereupon increases, the induced voltage of primary coil N1, N2 raises, and the base current of triode VT2 also continues to increase, and makes triode VT2 saturation conduction.Simultaneously, 5 ends of the secondary coil N3 of transformer T are positive induced voltage, and diode VD8 ends, and no current flows through in the load circuit.
Increase along with the base current of triode VT2, capacitor C 2 slowly is recharged, when charging voltage rises to certain value, the negative voltage of capacitor C 2 descends the base potential of triode VT2, the base current of triode VT2 reduces, and its collector electrode also electric current reduces thereupon, and it enters magnifying state by the saturation conduction state, because positive feedback makes it end again at once.When it ended, the sense of current of the second primary coil N2 was kept former direction, and therefore, the polarity of voltage of 3 ends of N2 is for negative, and the magnetic energy that transformer T stores transfers electric energy to pulse voltage, powers to the load after diode VD8 rectification, capacitor C 3 filtering.
The first primary coil N1, resistance R 2 and diode VT5, VT6, the VT7 of transformer T form voltage stabilizing circuit, and the second primary coil N2 is the sampling winding.The induced voltage of the second primary coil N2 of transformer T through the emitter of triode VT2, is added to the base stage of triode VT1 again by diode VD5.It is constant that voltage stabilizing circuit is stablized the collector voltage of triode VT1.The error voltage that triode VT1 compares sampling voltage and reference voltage amplifies, and by the base current of its collector electrode control triode VT2, makes output voltage stabilization.
Claims (1)
1, a kind of LED lamp circuit, comprise by diode (VD1), (VD2), (VD3) and reach the bridge rectifier of (VD4) forming, it is characterized in that: the collector electrode that is connected to triode (VT2) after (4,3) end serial connection of second primary coil (N2) of the positive pole of rectification circuit and transformer (T); Be connected to the negative pole of rectification circuit behind the emitter series resistor (R2) of triode (VT2), and receive the base stage of triode (VT1) after being in series with diode (VD5); The emitter of triode (VT1) is received the negative pole of rectification circuit, and collector electrode is connected with the base stage of triode (VT2); The cathode series resistance of rectification circuit (R1) back is connected with collector electrode, the base stage of triode (VT2), voltage stabilizing didoe (VD7), the resistance (R3) of triode (VT1); In parallel with voltage stabilizing didoe (VD7) again after resistance (R3) and electric capacity (C2), diode (VD6) serial connection; Electric capacity (C2) links to each other the negative pole of (1) termination rectification circuit (N1) with the tie point of diode (VD6) with (2) end of first primary coil (N1) of transformer (T); The tie point of diode (VD6), (VD7) links to each other with the negative pole of electrochemical capacitor (C1), and the positive pole of electric capacity (C1) connects the negative pole of rectification circuit; (6) end serial connection diode (VD8) of the secondary coil (N3) of transformer (T), (VD9), (VD10), the tie point of diode (VD8), (VD9) links to each other with the positive pole of electrochemical capacitor (C3), and negative pole (C3) connects (5) end of secondary coil (N3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520102160 CN2788503Y (en) | 2005-05-12 | 2005-05-12 | Circuit for LED lamp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520102160 CN2788503Y (en) | 2005-05-12 | 2005-05-12 | Circuit for LED lamp |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2788503Y true CN2788503Y (en) | 2006-06-14 |
Family
ID=36786795
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200520102160 Expired - Fee Related CN2788503Y (en) | 2005-05-12 | 2005-05-12 | Circuit for LED lamp |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2788503Y (en) |
-
2005
- 2005-05-12 CN CN 200520102160 patent/CN2788503Y/en not_active Expired - Fee Related
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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: 20060614 |