CN204330943U - load break alarm circuit - Google Patents
load break alarm circuit Download PDFInfo
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- CN204330943U CN204330943U CN201520023904.6U CN201520023904U CN204330943U CN 204330943 U CN204330943 U CN 204330943U CN 201520023904 U CN201520023904 U CN 201520023904U CN 204330943 U CN204330943 U CN 204330943U
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- photoelectrical coupler
- rectifier bridge
- light emitting
- microprocessor
- warning device
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Abstract
The utility model relates to a kind of load break alarm circuit, it comprises rectifier bridge, photoelectrical coupler, microprocessor and warning device, rectifier bridge to be connected in the ac power supply line of load and two of rectifier bridge direct current leading-out terminals by wire short circuit, the light emitting source of photoelectrical coupler and the branch road of this light emitting source on series limiting resistor in parallel with rectifier bridge, the light emitting source of photoelectrical coupler is the light emitting diode of two parallel connections and conducting direction reversal connection, the output terminal of photoelectrical coupler is electrically connected with the signal input part of microprocessor, warning device is connected electrically on the output terminal of microprocessor.The utility model have circuit connection structure simple, realize convenient, the reliable advantage of signal stabilization.
Description
Technical field
The utility model relates to safety utilization of electric power field, specifically a kind of load break alarm circuit.
Background technology
In order to prevent, humidity is excessive, temperature is too low causes the accident high voltage power distributing cabinet, often needs to install heating or dehumidification equipment, and domestic temperature and humidity controller or the Intelligent operation control device of switch cabinet of using carries out heating, dehumidifying more.But, this kind equipment in use, often run into the situations such as heating load breaks, load circuit does not connect, occur that the reason of this situation is often many-sided, such as load well heater burns out, wire dropping, personnel neglect connect unreliable, after this situation occurs, if operation of power networks personnel do not have Timeliness coverage and correct, may run high-voltage board and cause potential safety hazard, as reppear very much existing electric discharge, arcing of moisture in high-voltage board even causes the accidents such as power failure.
Temperature and humidity controller in the market and Intelligent operation control device of switch cabinet also consider the problem that load is broken at the beginning of design, how adopting current transformer mode detect the electric current of well heater thus judge whether to there occurs broken string at interiors of products, in use there are the following problems for this kind of open circuit detection mode:
1) applicable surface is narrow, the heating plate of user installation different capacity, can cause the difference of feedback signal.Such as producer's design uses the well heater of 200W, after user uses 50W well heater instead, there will be the situation of false alarm;
2) circuit is complicated, and use components and parts many, debug process is loaded down with trivial details.
Utility model content
The technical problems to be solved in the utility model be to provide a kind of circuit connection structure simple, realize convenient, signal stabilization reliable load break alarm circuit.
For solving the problems of the technologies described above, the design feature of the utility model load break alarm circuit comprises rectifier bridge, photoelectrical coupler, microprocessor and warning device, rectifier bridge to be connected in the ac power supply line of load and two of rectifier bridge direct current leading-out terminals by wire short circuit, the light emitting source of photoelectrical coupler and the branch road of this light emitting source on series limiting resistor in parallel with rectifier bridge, the light emitting source of photoelectrical coupler is the light emitting diode of two parallel connections and conducting direction reversal connection, the output terminal of photoelectrical coupler is electrically connected with the signal input part of microprocessor, warning device is connected electrically on the output terminal of microprocessor.
The light-receiving device of described photoelectrical coupler is phototriode.
Described microprocessor is single-chip microcomputer.
Described warning device is hummer.
Described warning device is LED alarm lamp.
The beneficial effects of the utility model are: connected by two of rectifier bridge DC terminals by wire, when load normally works, make the positive half cycle of alternating current and anti-half cycle all through two diodes, thus produce the pressure drop of 1.4 volts, this pressure drop of 1.4 volts is captured by the photoelectrical coupler of two light-emitting diode tubular type and be transferred to microprocessor after isolation, and when broken string situation appears in load, whole circuit power-off, microcontroller acquires, less than voltage signal, controls warning device and reports to the police.Visible, the syndeton of this circuit is simple, and it is convenient to realize, and by this circuit, the watt level regardless of load is how many, and the pressure drop signal of above-mentioned 1.4 volts can not change, thus makes warning circuit by the impact of bearing power, reports to the police more reliable.Utilize the buffer action of photoelectrical coupler, ensure the stability of Signal transmissions; Arrange hummer or LED alarm lamp as alarm signal, structure is simple, and alerting signal is more obvious.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, the utility model is described in further detail:
Fig. 1 is circuit theory schematic diagram of the present utility model.
Embodiment
With reference to accompanying drawing, load break alarm circuit of the present utility model comprises rectifier bridge 1, photoelectrical coupler 2, microprocessor 3 and warning device 4, rectifier bridge 1 is connected in the ac power supply line of load 5, I end and the III end of the rectifier bridge 1 namely shown in figure are connected in the ac power supply line of load 5, two direct current leading-out terminals of rectifier bridge 1 are by wire short circuit, and the II end of the rectifier bridge 1 namely shown in figure is connected by wire with IV end.The light emitting source 21 of the photoelectrical coupler 2 and branch road of this light emitting source 21 on series limiting resistor 6 in parallel with rectifier bridge 1, the light emitting source 21 of photoelectrical coupler 2 is the light emitting diode of two parallel connections and conducting direction reversal connection, namely so-called conducting direction reversal connection refers to the connection of two light emitting diodes as shown in FIG., and the light-receiving device 22 of photoelectrical coupler 2 is phototriode.The output terminal of photoelectrical coupler 2 is electrically connected with the signal input part of microprocessor 3, and warning device 4 is connected electrically on the output terminal of microprocessor 3, also show power module 7 in accompanying drawing, provides electric power to microprocessor 3 and warning device 4 by power module 7.
From the above, by wire, two of rectifier bridge 1 DC terminals are connected, when load normally works, the positive half cycle order of alternating current is I-II-IV-III, the order of negative half period is III-II-IV-I, make the positive half cycle of alternating current and anti-half cycle all through two diodes, thus produce the pressure drop of 1.4 volts, this pressure drop of 1.4 volts is captured by the photoelectrical coupler of two light-emitting diode tubular type and be transferred to microprocessor after isolation, and when broken string situation appears in load, whole circuit power-off, microcontroller acquires, less than voltage signal, controls warning device and reports to the police.Visible, the syndeton of this circuit is simple, and it is convenient to realize.By this circuit, because the pressure drops of 1.4 volts are the stable pressure drops produced by rectifier bridge 1, the watt level regardless of load is how many, and the pressure drop signal of above-mentioned 1.4 volts can not change, thus makes warning circuit by the impact of bearing power, reports to the police more reliable.Utilize the buffer action of photoelectrical coupler, ensure the stability of Signal transmissions.
Microprocessor 3 can adopt single-chip microcomputer.Warning device can adopt hummer or LED alarm lamp etc., and meanwhile, warning device also can control powerful alarm by switch member such as relays.Arrange hummer or LED alarm lamp as alarm signal, circuit structure is simple, and alerting signal is more obvious.The signal receiving circuit of single-chip microcomputer receiver voltage signal and be prior art to the on-off control circuit of warning device, does not repeat them here.
In sum, the utility model is not limited to above-mentioned embodiment.Those skilled in the art, under the prerequisite not departing from spirit and scope of the present utility model, can do some changes and modification.Protection domain of the present utility model should be as the criterion with claim of the present utility model.
Claims (5)
1. a load break alarm circuit, it is characterized in that comprising rectifier bridge (1), photoelectrical coupler (2), microprocessor (3) and warning device (4), rectifier bridge (1) to be connected in the ac power supply line of load (5) and two direct current leading-out terminals of rectifier bridge (1) by wire short circuit, the light emitting source (21) of photoelectrical coupler (2) and the branch road of this light emitting source (21) on series limiting resistor (6) in parallel with rectifier bridge (1), the light emitting source (21) of photoelectrical coupler (2) is the light emitting diode of two parallel connections and conducting direction reversal connection, the output terminal of photoelectrical coupler (2) is electrically connected with the signal input part of microprocessor (3), warning device (4) is connected electrically on the output terminal of microprocessor (3).
2. load break alarm circuit as claimed in claim 1, is characterized in that the light-receiving device (22) of described photoelectrical coupler (2) is phototriode.
3. load break alarm circuit as claimed in claim 1, is characterized in that described microprocessor (3) is single-chip microcomputer.
4. load break alarm circuit as claimed in claim 1, is characterized in that described warning device (4) is hummer.
5. load break alarm circuit as claimed in claim 1, is characterized in that described warning device (4) is LED alarm lamp.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520023904.6U CN204330943U (en) | 2015-01-14 | 2015-01-14 | load break alarm circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520023904.6U CN204330943U (en) | 2015-01-14 | 2015-01-14 | load break alarm circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204330943U true CN204330943U (en) | 2015-05-13 |
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ID=53167290
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520023904.6U Active CN204330943U (en) | 2015-01-14 | 2015-01-14 | load break alarm circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204330943U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109459655A (en) * | 2018-10-30 | 2019-03-12 | 苏州华旃航天电器有限公司 | A kind of connection test device |
-
2015
- 2015-01-14 CN CN201520023904.6U patent/CN204330943U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109459655A (en) * | 2018-10-30 | 2019-03-12 | 苏州华旃航天电器有限公司 | A kind of connection test device |
| CN109459655B (en) * | 2018-10-30 | 2020-09-08 | 苏州华旃航天电器有限公司 | Conduction testing device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP03 | Change of name, title or address | ||
| CP03 | Change of name, title or address |
Address after: Room 08, 14th Floor, Entrepreneurship Center Building, No. 4935, Fushou East Street, Yuanfei Community, Xincheng Street, High-tech Zone, Weifang City, Shandong Province, 261000 Patentee after: Shandong kena Electric Technology Co.,Ltd. Address before: West side of the first floor of the office building, No. 12869 Yuqing East Street, High-tech Zone, Weifang City, Shandong Province, 261061 Patentee before: WEIFANG KAINA ELECTRIC TECHNOLOGY Co.,Ltd. |