CN201078866Y - Circuit for LED lamp - Google Patents
Circuit for LED lamp Download PDFInfo
- Publication number
- CN201078866Y CN201078866Y CNU2007201124083U CN200720112408U CN201078866Y CN 201078866 Y CN201078866 Y CN 201078866Y CN U2007201124083 U CNU2007201124083 U CN U2007201124083U CN 200720112408 U CN200720112408 U CN 200720112408U CN 201078866 Y CN201078866 Y CN 201078866Y
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- Prior art keywords
- diode
- circuit
- rectifier
- transformer
- led lamp
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Abstract
The utility model discloses a circuit for LED light, which comprises a bridge rectifier circuit composed of diodes VD1, VD2, VD3 and VD4 and a voltage stabilizing circuit and a transformer T connected on the anode and cathode of the bridge rectifier circuit in parallel. A b end of a first primary coil N1 of the transformer T is connected with a joint point (4) of a conventional capacitor C2 in the voltage stabilizing circuit and a diode VD6; a c end of a second primary coil N2 of the transformer T is connected with a collector of a triode VT2 in the voltage stabilizing circuit; an f end of a secondary coil N3 of the transformer T is connected with rectifier diodes VD8 and VD9 in series; an electrolytic capacitor C3 is connected between the connection point of the rectifier diodes VD8 and VD9 and an e end of the secondary coil N3; a voltage-drop element is connected between the rectifier diode VD9 and a DC output end (1). The utility model has the advantages of smaller power consumption, longer service life, stabler output voltage and current of the circuit, higher safety performance and being capable of avoiding burning out the circuit for LED light due to fever of the rectifier diode.
Description
Technical field:
The utility model relates to a kind of LED lamp, specifically is a kind of LED lamp circuit.
Background technology:
Prior art LED lamp is just with its high brightness, feature of long life and progressively replace fluorescent lamp and other illuminating lamps that uses in people's daily life; And people also can pass through to reduce the peak value of LED lamp DC pulse in urgent hope, thereby reduce the voltage of LED lamp and further prolong its useful life.
Disclose on the China national intellectual property board web that the present inventor has applied for and the Granted publication of having authorized number is called the utility model patent of a kind of LED lamp with circuit for the CN2788503Y name, this utility model reduces the peak value of DC pulse by a bridge rectifier (AC-DC conversion) circuit, then through the voltage transmission of a voltage stabilizing circuit, be the power supply of LED lamp to load after the filtering of the rectification of the transformation by transformer, rectifier diode and electrochemical capacitor at last.Adopt the circuit structure of this working method reduced the LED lamp power consumption, enlarged the scope of external driving voltage value, increased the useful life of LED lamp.But in actual applications, it shows following deficiency: it is not that the superior functions of the low power consuming of LED light-emitting diode, long-life etc. performs to the best with the most critical parts of LED lamp; In addition, increase along with load on the above-mentioned utility model output, the rectifier diode of directly connect with the secondary coil of transformer can rapid intensification and cause overheated, thereby output voltage, the erratic fluctuations of electric current and the possibility that this rectifier diode is burnt out have been increased to a certain extent, thereby when having reduced LED lamp useful life, stayed an extra potential safety hazard also for above-mentioned utility model.
The utility model content:
The technical problems to be solved in the utility model is, provide a kind of not only power consumption littler, longer service life, and circuit output voltage, electric current are more stable, security performance is higher, the LED lamp circuit that can avoid direct rectifier diode of connecting with the transformer secondary output coil to burn out because of fever.
Technical solution of the present utility model is that a kind of LED circuit with following structure is provided: voltage stabilizing circuit and transformer T that it comprises the bridge rectifier of being made up of diode VD1, VD2, VD3, VD4 and is connected in parallel on bridge rectifier positive pole and negative pole; Common electric capacity C2 links to each other with diode VD6 tie point in the b of the first primary coil N1 of described transformer T end and the voltage stabilizing circuit; The c end of the second primary coil N2 of described transformer T links to each other with the collector electrode of triode VT2 in the voltage stabilizing circuit; The f end of the secondary coil N3 of described transformer T is serially connected with rectifier diode VD8, VD9; Be connected with electrochemical capacitor C3 between the tie point of described rectifier diode VD8 and VD9 and the e of the secondary coil N3 end; Be connected with a voltage drop element between described rectifier diode VD9 and the dc output end.
After adopting above structure, compared with prior art, the utlity model has following advantage: the utility model is after being connected with a voltage drop element between rectifier diode VD9 and the dc output end, can effectively reduce direct current output, make the waveform of DC pulse more steady, thereby greatly reduce the load of LED lamp when current peak, saved energy resource consumption greatly, improved the useful life of LED lamp.In addition, the reduction of the load of LED lamp when current peak has also alleviated the current loading of the rectifier diode VD8 that directly connects with the transformer secondary output coil, thereby make circuit output voltage, when electric current is more stable, also avoided rectifier diode VD8 and burnt out, improved the useful life of LED lamp because of fever.
The above-mentioned voltage drop element that is connected between rectifier diode VD9 and the dc output end can adopt fixed resistance.
As a kind of improvement, can be connected with voltage drop element between the negative pole of the diode VD3 of bridge rectifier and the ac input end in the utility model.The purpose that is connected voltage drop element between the negative pole of the diode VD3 of bridge rectifier and ac input end is to reduce direct current output by reducing the alternating voltage input value, make the waveform of DC pulse become more steady, thereby further reduced the load of LED lamp when current peak, save energy resource consumption, improved the useful life of LED lamp.
The negative pole of the above-mentioned diode VD3 that is connected bridge rectifier and the voltage drop element between the ac input end can be fixed resistance.
Description of drawings:
Figure is a structural representation of the present utility model.
Embodiment:
The utility model is described in further detail below in conjunction with the drawings and specific embodiments:
As shown in drawings, the utility model part same as the prior art is: voltage stabilizing circuit and transformer T that the utility model also comprises the bridge rectifier of being made up of diode VD1, VD2, VD3, VD4 and is connected in parallel on bridge rectifier positive pole and negative pole; Described voltage stabilizing circuit comprises electrochemical capacitor C1, common electric capacity C2, resistance R 1, R2, R3, diode VD5, VD6, voltage stabilizing didoe VD7 and triode VT1, VT2.Concrete annexation between foregoing circuit and each components and parts is: be connected on the collector electrode of triode VT2 after d, the c end of the positive pole of described rectification circuit and the second primary coil N2 of transformer T is connected in series; Be connected to the negative pole of bridge rectifier behind the emitter series resistor R2 of described triode VT2, and be connected the base stage of triode VT1 after being in series with diode VD5 simultaneously; The emitter of triode VT1 is connected the negative pole of bridge rectifier, and its 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 described bridge rectifier; In parallel with voltage stabilizing didoe VD7 again after described resistance R 3 and common electric capacity C2, the diode VD6 serial connection; Described common electric capacity C2 links to each other the negative pole of a termination bridge rectifier of the described first primary coil N1 with the tie point of diode VD6 with the b end of the first primary coil N1 of transformer T; The tie point of described diode VD6, VD7 links to each other with the negative pole of electrochemical capacitor C1, and the positive pole of electrochemical capacitor C1 connects the negative pole of bridge rectifier; F end serial connection diode VD8 and the VD9 of the secondary coil N3 of described transformer T; Being connected with the positive pole of electrochemical capacitor C3 of described diode VD8 and VD9 links to each other, and the negative pole of described electrochemical capacitor C connects the e end of secondary coil N3.
The maximum difference of the utility model and prior art is: be connected with a voltage drop element between described rectifier diode VD9 and the dc output end 1, this voltage drop element can be preferably fixed resistance 21.In addition, also can be connected a voltage drop element between the negative pole of the diode VD3 of described bridge rectifier and the ac input end 3, this voltage drop element also can be preferably fixed resistance 22.
The utility model plays the hypotensive effect except resistance 21 and resistance 22, and the structure of other parts is all same as the prior art, so its operation principle is also same as the prior art, so do not give unnecessary details at this.
In addition, voltage drop element of the present utility model also is not limited to fixed resistance, and it can also be adjustable resistance, fixed capacity and tunable capacitor etc., and these variations all fall into protection range of the present utility model.
Claims (4)
1. LED lamp circuit, the voltage stabilizing circuit and the transformer T that comprise the bridge rectifier of forming by diode VD1, VD2, VD3, VD4 and be connected in parallel on bridge rectifier positive pole and negative pole; Common electric capacity C2 links to each other with diode VD6 tie point (4) in the b of the first primary coil N1 of described transformer T end and the voltage stabilizing circuit; The c end of the second primary coil N2 of described transformer T links to each other with the collector electrode of triode VT2 in the voltage stabilizing circuit; The f end of the secondary coil N3 of described transformer T is serially connected with rectifier diode VD8, VD9; Be connected with electrochemical capacitor C3 between the tie point of described rectifier diode VD8 and VD9 and the e of the secondary coil N3 end, it is characterized in that: be connected with a voltage drop element between described rectifier diode VD9 and the dc output end (1).
2. LED lamp circuit according to claim 1 is characterized in that: the described voltage drop element that is connected between rectifier diode VD9 and the dc output end (1) is fixed resistance (21).
3. LED lamp circuit according to claim 1 is characterized in that: be connected with a voltage drop element between the negative pole of the diode VD3 of described bridge rectifier and the ac input end (3).
4. LED lamp circuit according to claim 3 is characterized in that: described negative pole and the voltage drop element between the ac input end (3) that is connected the diode VD3 of bridge rectifier is fixed resistance (22).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201124083U CN201078866Y (en) | 2007-07-30 | 2007-07-30 | Circuit for LED lamp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201124083U CN201078866Y (en) | 2007-07-30 | 2007-07-30 | Circuit for LED lamp |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201078866Y true CN201078866Y (en) | 2008-06-25 |
Family
ID=39570931
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007201124083U Expired - Fee Related CN201078866Y (en) | 2007-07-30 | 2007-07-30 | Circuit for LED lamp |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201078866Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103428967A (en) * | 2013-07-03 | 2013-12-04 | 惠州元晖光电股份有限公司 | Lossless forward voltage matching network for LED driver |
-
2007
- 2007-07-30 CN CNU2007201124083U patent/CN201078866Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103428967A (en) * | 2013-07-03 | 2013-12-04 | 惠州元晖光电股份有限公司 | Lossless forward voltage matching network for LED driver |
| WO2015000189A1 (en) * | 2013-07-03 | 2015-01-08 | Huizhou Light Engine Limited | Lossless forward voltage matching network for led drivers |
| CN103428967B (en) * | 2013-07-03 | 2015-09-16 | 惠州元晖光电股份有限公司 | For the harmless forward voltage matching network of LED driver |
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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: 20080625 |