CN203850918U - Power failure emergency alarm circuit - Google Patents
Power failure emergency alarm circuit Download PDFInfo
- Publication number
- CN203850918U CN203850918U CN201420274339.6U CN201420274339U CN203850918U CN 203850918 U CN203850918 U CN 203850918U CN 201420274339 U CN201420274339 U CN 201420274339U CN 203850918 U CN203850918 U CN 203850918U
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- triode
- rectifier diode
- power failure
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- resistance
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Abstract
The utility model discloses a power failure emergency alarm circuit which comprises an AC input stage and a DC source. The power failure emergency alarm circuit further comprises a rectification input stage and an AC-DC switch stage. The rectification input stage is composed of a first capacitor, a second capacitor, a Zener diode and a first rectifier diode. The AC-DC switch stage is composed of a first triode, a second triode, a first resistor, a second resistor and a second rectifier diode. The DC source is connected between a ground wire and the collector electrode of the second triode. A work load is connected between the ground wire and the emitter electrode of the second triode. The power failure emergency alarm circuit which only requires a small number of separating devices to achieve a power failure alarm function is suitably widely popularized and used in nodes of AC electrical networks in low-precision power supply conditions.
Description
Technical field
The utility model relates to electronic circuit field, particularly, relates to a kind of power failure emergency warning circuit.
Background technology
To the monitoring of AC network or miscellaneous equipment, conventionally use the electric main of 220V to power, 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.
Although have on the market, exchanging under power down mode also workable emergency set, 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 power failure emergency warning circuit.
Power failure emergency warning circuit 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 comprised 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 comprised 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 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; 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, the warning lamp that described operating load is direct current supply or loudspeaker.
Power failure emergency warning circuit described in the utility model, when electric main input power-off, can automatically detect and switch to direct current supply mode, and under AC dump, provide and continue to report to the police, need not the required various integrated circuit (IC) chip of traditional emergency set, only need quantity discrete device seldom can complete power failure warning function, be adapted in each node large-scale popularization of AC network, using under low precision electric power thus supplied.
Accompanying drawing explanation
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.
Power failure emergency warning circuit, 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 comprised 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 comprised 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 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;
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, while needing more high voltage, can realize by a plurality of voltage stabilizing didoes that superpose.
After step-down, through the first rectifier diode VD1, will exchange the filtering of negative pressure waveform with the second capacitor C 2 again, in the second capacitor C 2, obtain the half-wave DC voltage that amplitude narrows, because the first transistor base voltage is much larger than cut-in voltage, VT1 conducting, the second triode VT2 base voltage is dragged down, cause the second triode VT2 can not conducting.
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 powers to the operating load RL 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.Described operating load is conventional direct current supply warning device, such as warning lamp, loudspeaker or other acousto-optic devices etc.
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, after electric main power-off, during 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. power failure emergency warning circuit, 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 comprised 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 comprised 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 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;
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. power failure emergency warning circuit 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. power failure emergency warning circuit 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. power failure emergency warning circuit according to claim 1, is characterized in that, the warning lamp that described operating load is direct current supply or loudspeaker.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420274339.6U CN203850918U (en) | 2014-05-27 | 2014-05-27 | Power failure emergency alarm circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420274339.6U CN203850918U (en) | 2014-05-27 | 2014-05-27 | Power failure emergency alarm circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203850918U true CN203850918U (en) | 2014-09-24 |
Family
ID=51563888
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420274339.6U Expired - Fee Related CN203850918U (en) | 2014-05-27 | 2014-05-27 | Power failure emergency alarm circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203850918U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104022566A (en) * | 2014-05-27 | 2014-09-03 | 国网四川省电力公司成都市新都供电分公司 | Power failure emergency alarm circuit |
-
2014
- 2014-05-27 CN CN201420274339.6U patent/CN203850918U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104022566A (en) * | 2014-05-27 | 2014-09-03 | 国网四川省电力公司成都市新都供电分公司 | Power failure emergency alarm circuit |
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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 | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140924 Termination date: 20200527 |