CN203883549U - AC/DC automatic switch - Google Patents
AC/DC automatic switch Download PDFInfo
- Publication number
- CN203883549U CN203883549U CN201420274177.6U CN201420274177U CN203883549U CN 203883549 U CN203883549 U CN 203883549U CN 201420274177 U CN201420274177 U CN 201420274177U CN 203883549 U CN203883549 U CN 203883549U
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- triode
- rectifier diode
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- stage
- power supply
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Abstract
An AC/DC automatic switch provided by the utility model comprises an AC input stage and a DC power supply, and furthermore comprises a rectifying input stage and an AC/DC switching stage. The rectifying input stage is composed of a first capacitor, a second capacitor, a Zener diode and a first rectifying diode. The AC/DC switching stage is composed of a first triode, a second triode, a first resistor, a second resistor and a second rectifying diode. The DC power supply is connected between a grounding wire and the collector electrode of the second triode. A working load is connected between the grounding wire and the emitter electrode of the second triode. The AC/DC automatic switch can automatically detect and switches to a DC power supply mode when input of AC commercial power stops. The AC/DC automatic switch has advantages of: simple structure, no requirement for various integrated circuit chips required in traditional emergency equipment, reliable capability of finishing an AC/DC conversion function through a small number of separating devices, and high suitability for wide popularization on low-precision power supply condition.
Description
Technical field
The utility model relates to electronic circuit field, particularly, relates to a kind of alternating current-direct current automatic switchover device.
Background technology
Monitoring to AC network or miscellaneous equipment use the electric main of 220V to power conventionally, use electric main power supply easily convenient, power supply driving force is strong, once but have a power failure, can not normally use, during particularly due to the power-off of power grid accident large area, especially need the equipment relevant to grid maintenance normally to work, for example warning system, emergency lighting system and some repair apparatus etc.
Exchanging under power down mode also workable emergency set although have on the market, most use high precision DC power supplies or battery and supporting charging circuits, apparatus expensive, versatility is poor, and use does not suit large area to popularize.
Utility model content
For overcoming prior art apparatus expensive, the technological deficiency that versatility is poor, the utility model discloses a kind of alternating current-direct current automatic switchover device.
Alternating current-direct current automatic switchover device described in the utility model, comprises and exchanges input stage and DC power supply; Also comprise rectification input stage and alternating current-direct current stage of switches, described rectification input stage is made up of the first electric capacity, the second electric capacity, voltage stabilizing didoe and the first rectifier diode, described the first electric capacity is connected between live wire input and the first rectifier diode positive pole, described voltage stabilizing didoe is connected between the first rectifier diode positive pole and zero line input, and described the second electric capacity is connected between the first rectifier diode negative pole and zero line input; Described alternating current-direct current stage of switches is made up of the first triode, the second triode, the first resistance, the second resistance, the second rectifier diode, the base stage of described the first triode and collector electrode are connected respectively one end of the first resistance, the second resistance, and the other end of the first resistance, the second resistance connects respectively the positive and negative electrode of the second rectifier diode; The emitter of the positive pole of described the second rectifier diode and the first triode is connected respectively the first rectifier diode negative pole and zero line input; Described the first transistor collector connects the second transistor base, and the collector electrode of described the second triode connects the negative pole of the second rectifier diode; The base stage of described the first triode is also connected with the emitter of the second triode; DC power supply is connected between ground wire and the collector electrode of the second triode, and operating load is connected between ground wire and the second transistor emitter.
Preferably, described live wire input and/or input zero line side are also in series with fuse resistor.
Preferably, between described the second transistor collector and DC power supply, be also connected with light-emitting diode.
Concrete, described the first rectifier diode, the second rectifier diode model are IN4001.
Alternating current-direct current automatic switchover device described in the utility model, in the time of electric main input power-off, can automatically detect and switch to direct current supply mode, simple in structure, need not the required various integrated circuit (IC) chip of traditional emergency set, only need the little discrete device of quantity can complete AC-DC conversion function, be adapted at large-scale popularization under low precision electric power thus supplied and use.
Brief description of the drawings
Fig. 1 is a kind of embodiment schematic diagram of the utility model;
Mark and corresponding parts title in accompanying drawing: RF-fuse resistor, C1-the first electric capacity, C2-the second electric capacity, L-live wire input, N-zero line input, VS-voltage stabilizing didoe VD1-the first rectifier diode, VD2-the second rectifier diode, VD3-light-emitting diode, R1-the first resistance, R2-the second resistance, RL-operating load, VT1-the first triode, VT2-the second triode, DC-DC power supply.
Embodiment
Below in conjunction with embodiment and accompanying drawing, the utility model is done to detailed description further, but execution mode of the present utility model is not limited to this.
Alternating current-direct current automatic switchover device, comprises and exchanges input stage and DC power supply; Also comprise rectification input stage and alternating current-direct current stage of switches, described rectification input stage is made up of the first capacitor C 1, the second capacitor C 2, voltage stabilizing didoe VS and the first rectifier diode D1, described the first electric capacity is connected between live wire input L and the first rectifier diode positive pole, described voltage stabilizing didoe is connected between the first rectifier diode positive pole and zero line input, and described the second electric capacity is connected between the first rectifier diode negative pole and zero line input N;
Described alternating current-direct current stage of switches is made up of the first triode VT1, the second triode VT2, the first resistance R 1, the second resistance R 2, the second rectifier diode VD2, the base stage of described the first triode and collector electrode are connected respectively one end of the first resistance, the second resistance, and the other end of the first resistance, the second resistance connects respectively the positive and negative electrode of the second rectifier diode; The emitter of the positive pole of described the second rectifier diode and the first triode is connected respectively the first rectifier diode negative pole and zero line input; Described the first transistor collector connects the second transistor base, and the collector electrode of described the second triode connects the negative pole of the second rectifier diode; The base stage of described the first triode is also connected with the emitter of the second triode;
DC power supply is connected between ground wire and the collector electrode of the second triode, and operating load is connected between ground wire and the second transistor emitter.
From exchanging live wire input and the zero line input input power frequency 220V civil power of input stage, alternating voltage is by the first capacitor C 1 and voltage stabilizing didoe VS step-down, conventionally the single step-down value of voltage stabilizing didoe is at 3-10V, voltage of voltage regulation determines according to the operating voltage of operating load, need more when high voltage, can to realize by the multiple voltage stabilizing didoes of stack.
After step-down, will exchange the filtering of negative pressure waveform through the first rectifier diode VD1 with the second capacitor C 2 again, in the second capacitor C 2, obtain the half-wave DC voltage that amplitude narrows, direct current is given operating load RL power supply by the first resistance R 1, because the first transistor base voltage is much larger than cut-in voltage, VT1 conducting, the second triode VT2 base voltage is dragged down, simultaneously on operating load RL, have pressure drop, cause the second triode VT2 can not conducting.
When after electric main power-off, the first triode VT1 becomes cut-off from conducting, DC power supply DC voltage is added in the second triode by the second resistance R 2, makes the second triode conducting, and DC power supply DC gives the operating load RL power supply that is connected to its emitter by the second triode.After electric main recovers, VT1 conducting, VT2 closes, and operating load continues to be powered by electric main.An embodiment is: C1=1.5 microfarad, and C2=100 microfarad, R1=5.1K, R2=1K, wherein sees the device of high pressure, and for example C1 need to get the electric capacity that withstand voltage is high, and the first rectifier diode, the second rectifier diode model are selected cheap IN4001.
Preferably, described live wire input and/or zero line input are also in series with fuse resistor RF.Fuse resistor plays large current fusing protection left and right.Can be at the second transistor collector branch road connecting luminous diode, when after electric main power-off, when direct current supply, light-emitting diode conducting is luminous, reminds electric main power-off.
As mentioned above, can realize preferably the utility model.
Claims (1)
1. alternating current-direct current automatic switchover device, comprises and exchanges input stage and DC power supply; It is characterized in that, also comprise rectification input stage and alternating current-direct current stage of switches, described rectification input stage is made up of the first electric capacity, the second electric capacity, voltage stabilizing didoe and the first rectifier diode, described the first electric capacity is connected between live wire input and the first rectifier diode positive pole, described voltage stabilizing didoe is connected between the first rectifier diode positive pole and zero line input, and described the second electric capacity is connected between the first rectifier diode negative pole and zero line input;
Described alternating current-direct current stage of switches is made up of the first triode, the second triode, the first resistance, the second resistance, the second rectifier diode, the base stage of described the first triode and collector electrode are connected respectively one end of the first resistance, the second resistance, and the other end of the first resistance, the second resistance connects respectively the positive and negative electrode of the second rectifier diode; The emitter of the positive pole of described the second rectifier diode and the first triode is connected respectively the first rectifier diode negative pole and zero line input; Described the first transistor collector connects the second transistor base, and the collector electrode of described the second triode connects the negative pole of the second rectifier diode; The base stage of described the first triode is also connected with the emitter of the second triode;
DC power supply is connected between ground wire and the collector electrode of the second triode, and operating load is connected between ground wire and the second transistor emitter.
2. alternating current-direct current automatic switchover device according to claim 1, is characterized in that, described live wire input and/or input zero line side are also in series with fuse resistor.
3. alternating current-direct current automatic switchover device according to claim 1, is characterized in that, between described the second transistor collector and DC power supply, is also connected with light-emitting diode.
4. alternating current-direct current automatic switchover device according to claim 1, is characterized in that, described the first rectifier diode, the second rectifier diode model are IN4001.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420274177.6U CN203883549U (en) | 2014-05-27 | 2014-05-27 | AC/DC automatic switch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420274177.6U CN203883549U (en) | 2014-05-27 | 2014-05-27 | AC/DC automatic switch |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203883549U true CN203883549U (en) | 2014-10-15 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420274177.6U Expired - Fee Related CN203883549U (en) | 2014-05-27 | 2014-05-27 | AC/DC automatic switch |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203883549U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105490376A (en) * | 2016-01-28 | 2016-04-13 | 合肥惠科金扬科技有限公司 | AC-DC automatic switching power supply system |
-
2014
- 2014-05-27 CN CN201420274177.6U patent/CN203883549U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105490376A (en) * | 2016-01-28 | 2016-04-13 | 合肥惠科金扬科技有限公司 | AC-DC automatic switching power supply system |
| CN105490376B (en) * | 2016-01-28 | 2018-09-04 | 合肥惠科金扬科技有限公司 | Alternating current-direct current automatically switches power supply system |
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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: 20141015 Termination date: 20200527 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |