CN205305162U - High -efficient constant current voltage dropping power supply - Google Patents
High -efficient constant current voltage dropping power supply Download PDFInfo
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- CN205305162U CN205305162U CN201520973894.2U CN201520973894U CN205305162U CN 205305162 U CN205305162 U CN 205305162U CN 201520973894 U CN201520973894 U CN 201520973894U CN 205305162 U CN205305162 U CN 205305162U
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Abstract
The utility model discloses a high -efficient constant current voltage dropping power supply, including chip U1, transformer T, fuse FU, diode VD1, opto -coupler U1 and electric capacity C2, 220V alternating current one end is connected to fuse FU one end, transformer T coil L1 is connected to the fuse FU other end, anodal and the diode VD4 negative pole of diode VD2 is connected respectively to the transformer T coil L1 other end, it is anodal that diode VD3 is connected respectively to diode VD4 positive pole, electric capacity C2, chip U1's S end and electric capacity C3, anodal and the transformer T coil L2 of diode VD1 is connected respectively to diode VD3 negative pole, the 220V alternating current other end is connected to the transformer T coil L2 other end. The utility model discloses high -efficient constant current voltage dropping power supply adopts linkSwitch -TN series device as controlling element, and circuit structure is simple, and is with low costs, small, enables output vo and keeps the constant current to export especially adapted using widely.
Description
Technical field
This utility model relates to a kind of power supply, specifically a kind of high-efficiency constant-flow voltage dropping power supply.
Background technology
A lot of electrical equipments need constant current source to drive, and LED is model therein, in today that energy crisis and climate warming problem are increasingly severe, energy-conservation have become social focus subject under discussion with environmental protection. LED gets more and more people's extensive concerning because of plurality of advantages such as it is efficient, energy-saving and environmental protection, life-span length, rich color, volume flicker little, resistance to, reliability are high, regulation and control are convenient, it is believed that be 21 century the most promising lighting source. Big electric current is needed during highlighted LED operation, when driving highlighted LED from a voltage source, required electric current can be set by a suitable series resistance, if voltage source is battery, then along with the consumption of battery electric power, the brightness of LED is also successively decreased, but, the shortcoming of series resistance is the increase in the power consumption of circuit, and can not control constant current output.
Utility model content
The purpose of this utility model is in that to provide a kind of high-efficiency constant-flow voltage dropping power supply, with the problem solving to propose in above-mentioned background technology.
For achieving the above object, this utility model provides following technical scheme:
A kind of high-efficiency constant-flow voltage dropping power supply, including chip U1, transformator T, fuse FU, diode VD1, optocoupler U1 and electric capacity C2, described fuse FU one end connects 220V alternating current one end, fuse FU other end connection transformer T coil L1, the transformator T coil L1 other end connects diode VD2 positive pole and diode VD4 negative pole respectively, diode VD4 positive pole connects diode VD3 positive pole respectively, electric capacity C2, the S end of chip U1 and electric capacity C3, diode VD3 negative pole connects diode VD1 positive pole and transformator T coil L2 respectively, the transformator T coil L2 other end connects the 220V alternating current other end, diode VD1 negative pole connects diode VD2 negative pole respectively, the electric capacity C2 other end, diode VD5 negative pole, electric capacity C4, diode VR1 negative pole, electric capacity C5, resistance R5 and output end vo, diode VD5 positive pole connects D end and the inductance L of chip U1 respectively, the inductance L other end connects the electric capacity C4 other end respectively, light emitting diode negative pole and resistance R4 in optocoupler U2, the resistance R4 other end connects resistance R3 and the resistance R5 other end respectively, the resistance R3 other end connects the electric capacity C5 other end respectively, light emitting diode positive pole in resistance R2 and optocoupler U2, the resistance R2 other end connects diode VR2 positive pole, diode VR2 negative pole connects diode VR2 positive pole, the described electric capacity C3 other end connects the BP end of phototriode colelctor electrode and chip U1 in optocoupler U2 respectively, in optocoupler U2, phototriode emitter stage connects the FB end of chip U1.
As further program of the utility model: described chip U1 adopts LinkSwitch-TN series.
As further program of the utility model: described optocoupler U2 adopts 4N25.
As this utility model further scheme: described diode VR1 and diode VR2 is Zener diode.
Compared with prior art, the beneficial effects of the utility model are: this utility model high-efficiency constant-flow voltage dropping power supply adopts LinkSwitch-TN family device as controlling element, and circuit structure is simple, cost is low, volume is little, output end vo can be made to keep constant current output, be especially suitable for and promote the use of.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of high-efficiency constant-flow voltage dropping power supply.
Detailed description of the invention
Below in conjunction with the accompanying drawing in this utility model embodiment, the technical scheme in this utility model embodiment is clearly and completely described, it is clear that described embodiment is only a part of embodiment of this utility model, rather than whole embodiments. Based on the embodiment in this utility model, the every other embodiment that those of ordinary skill in the art obtain under not making creative work premise, broadly fall into the scope of this utility model protection.
Refer to Fig. 1, in this utility model embodiment, a kind of high-efficiency constant-flow voltage dropping power supply, including chip U1, transformator T, fuse FU, diode VD1, optocoupler U1 and electric capacity C2, fuse FU one end connects 220V alternating current one end, fuse FU other end connection transformer T coil L1, the transformator T coil L1 other end connects diode VD2 positive pole and diode VD4 negative pole respectively, diode VD4 positive pole connects diode VD3 positive pole respectively, electric capacity C2, the S end of chip U1 and electric capacity C3, diode VD3 negative pole connects diode VD1 positive pole and transformator T coil L2 respectively, the transformator T coil L2 other end connects the 220V alternating current other end, diode VD1 negative pole connects diode VD2 negative pole respectively, the electric capacity C2 other end, diode VD5 negative pole, electric capacity C4, diode VR1 negative pole, electric capacity C5, resistance R5 and output end vo, diode VD5 positive pole connects D end and the inductance L of chip U1 respectively, the inductance L other end connects the electric capacity C4 other end respectively, light emitting diode negative pole and resistance R4 in optocoupler U2, the resistance R4 other end connects resistance R3 and the resistance R5 other end respectively, the resistance R3 other end connects the electric capacity C5 other end respectively, light emitting diode positive pole in resistance R2 and optocoupler U2, the resistance R2 other end connects diode VR2 positive pole, diode VR2 negative pole connects diode VR2 positive pole, the described electric capacity C3 other end connects the BP end of phototriode colelctor electrode and chip U1 in optocoupler U2 respectively, in optocoupler U2, phototriode emitter stage connects the FB end of chip U1.
Chip U1 adopts LinkSwitch-TN series.
Optocoupler U2 adopts 4N25.
Diode VR1 and diode VR2 is Zener diode.
Operation principle of the present utility model is: refer to Fig. 1, and circuit adopts LinkSwitch-TN device, it is possible to provide the constant current output of 130mA, and output voltage is DC70V, and fuse FU provides protection when there is catastrophe failure. Diode VD1 ~ VD4 provides all wave rectification, the DC bus voltage that high-voltage capacitance C2 remains stable for simultaneously, and during U1 turns on, electric current is through electric capacity C4, output end vo and inductance L, and this electric current makes L store certain energy, and provides energy to output end vo load.
During U1 turns off, the pole reversal of L, to maintain electric current, and provide forward bias for fly-wheel diode VD5, to keep electric current to flow and to be continuously C4 and load offer energy.Output voltage stabilizing can be kept by an ON-OFF control circuit, so can enable and disable (skipping) switch periods according to change in voltage and load state. When each turn-on cycle starts, feedback (FB) pin of U1 is sampled. If from the electric current of the transistor feed-in FB pin in photoelectrical coupler U2 more than 49uA, this current cycle will be skipped.
Electric capacity C3 is the shunt capacitance of LinkSwitch-TN, and resistance R4 is current sense resistor, once the voltage on R4 exceedes the VF of the light emitting diode in photoelectrical coupler, feedback control loop will close, and output electric current is regulated. Resistance R3 adjusts the DC current gain of whole feedback control loop. If outfan load disconnects, by Zener diode VR1 and VR2, output voltage can be adjusted to the maximum being about 75V. Electric capacity C5 is for reducing the sensitivity of noise, and can be uniformly distributed among switch periods, and resistance R5 can for discharging the electric energy stored in High voltage output electric capacity time electrically disconnected.
It is obvious to a person skilled in the art that this utility model is not limited to the details of above-mentioned one exemplary embodiment, and when without departing substantially from spirit of the present utility model or basic feature, it is possible to realize this utility model in other specific forms. Therefore, no matter from which point, embodiment all should be regarded as exemplary, and be nonrestrictive, scope of the present utility model is limited by claims rather than described above, it is intended that all changes in the implication of the equivalency dropping on claim and scope included in this utility model. Any accompanying drawing labelling in claim should be considered as the claim that restriction is involved.
In addition, it is to be understood that, although this specification is been described by according to embodiment, but not each embodiment only comprises an independent technical scheme, this narrating mode of description is only for clarity sake, description should be made as a whole by those skilled in the art, and the technical scheme in each embodiment through appropriately combined, can also form other embodiments that it will be appreciated by those skilled in the art that.
Claims (4)
1. a high-efficiency constant-flow voltage dropping power supply, including chip U1, transformator T, fuse FU, diode VD1, optocoupler U1 and electric capacity C2, it is characterized in that, described fuse FU one end connects 220V alternating current one end, fuse FU other end connection transformer T coil L1, the transformator T coil L1 other end connects diode VD2 positive pole and diode VD4 negative pole respectively, diode VD4 positive pole connects diode VD3 positive pole respectively, electric capacity C2, the S end of chip U1 and electric capacity C3, diode VD3 negative pole connects diode VD1 positive pole and transformator T coil L2 respectively, the transformator T coil L2 other end connects the 220V alternating current other end, diode VD1 negative pole connects diode VD2 negative pole respectively, the electric capacity C2 other end, diode VD5 negative pole, electric capacity C4, diode VR1 negative pole, electric capacity C5, resistance R5 and output end vo, diode VD5 positive pole connects D end and the inductance L of chip U1 respectively, the inductance L other end connects the electric capacity C4 other end respectively, light emitting diode negative pole and resistance R4 in optocoupler U2, the resistance R4 other end connects resistance R3 and the resistance R5 other end respectively, the resistance R3 other end connects the electric capacity C5 other end respectively, light emitting diode positive pole in resistance R2 and optocoupler U2, the resistance R2 other end connects diode VR2 positive pole, diode VR2 negative pole connects diode VR2 positive pole, the described electric capacity C3 other end connects the BP end of phototriode colelctor electrode and chip U1 in optocoupler U2 respectively, in optocoupler U2, phototriode emitter stage connects the FB end of chip U1.
2. high-efficiency constant-flow voltage dropping power supply according to claim 1, it is characterised in that described chip U1 adopts LinkSwitch-TN series.
3. high-efficiency constant-flow voltage dropping power supply according to claim 1, it is characterised in that described optocoupler U2 adopts 4N25.
4. high-efficiency constant-flow voltage dropping power supply according to claim 1, it is characterised in that described diode VR1 and diode VR2 is Zener diode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520973894.2U CN205305162U (en) | 2015-11-30 | 2015-11-30 | High -efficient constant current voltage dropping power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520973894.2U CN205305162U (en) | 2015-11-30 | 2015-11-30 | High -efficient constant current voltage dropping power supply |
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| Publication Number | Publication Date |
|---|---|
| CN205305162U true CN205305162U (en) | 2016-06-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520973894.2U Expired - Fee Related CN205305162U (en) | 2015-11-30 | 2015-11-30 | High -efficient constant current voltage dropping power supply |
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| Country | Link |
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| CN (1) | CN205305162U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113301688A (en) * | 2021-05-10 | 2021-08-24 | 赛尔富电子有限公司 | Constant-current LED power supply circuit capable of limiting power supply output power and no-load voltage |
-
2015
- 2015-11-30 CN CN201520973894.2U patent/CN205305162U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113301688A (en) * | 2021-05-10 | 2021-08-24 | 赛尔富电子有限公司 | Constant-current LED power supply circuit capable of limiting power supply output power and no-load voltage |
| CN113301688B (en) * | 2021-05-10 | 2024-04-12 | 赛尔富电子有限公司 | Constant-current LED power supply circuit capable of limiting power supply output power and no-load voltage |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160608 Termination date: 20161130 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |