CN203251068U - A current overload alarm circuit - Google Patents
A current overload alarm circuit Download PDFInfo
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- CN203251068U CN203251068U CN 201320281367 CN201320281367U CN203251068U CN 203251068 U CN203251068 U CN 203251068U CN 201320281367 CN201320281367 CN 201320281367 CN 201320281367 U CN201320281367 U CN 201320281367U CN 203251068 U CN203251068 U CN 203251068U
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Abstract
The utility model relates to an alarm circuit and especially relates to a current overload alarm circuit. The current overload alarm circuit comprises an input end, an output end, a resistor, a current detecting circuit, and an alarm unit. The input end is connected with a power supply in order to provide power for other units in the current overload alarm circuit. The output end is connected with the resistor in series and then is electrically connected with the input end. The output end can be electrically connected with a load. The current detecting circuit is electrically connected with the resistor. The alarm unit is used for giving an alarm and is electrically connected with the current detecting circuit. The current overload alarm circuit has beneficial effects that when the current load of the current overload alarm circuit is more than a selected first default value, the alarm unit is automatically started, and that when the current load is more than a preset default value, a circuit cutting unit is started in order that the output end does not output power for substantially increasing security. The resistor is produced by manganese copper alloy material and has characteristics of a small size, low internal resistance, high withstand current, and low cost.
Description
Technical field
The utility model relates to circuit for alarming, relates in particular to the alarming current overload circuit.
Background technology
General electrical equipment must be considered the position of socket in use, avoids that plug wires is too short to cause using inconvenience.Also because so, someone designs the power board socket, how far have regardless of the distance of electrical equipment from socket, all can provide required electric power, need not be subject to the position of socket when making electrical equipment use.
When family uses, general power board socket can be electrically connected a plurality of household electrical appliance, this is very possible so that the electric current amount of overloading, although general power board socket is equipped with release, but release often can't form immediately when electric current overloads and open circuit, and this power board socket is also without alarming structure simultaneously; When the power board socket is used for machine for kitchen use (such as electric rice cooker, baking box, microwave oven etc.) in addition, because the machine for kitchen use majority belongs to high consumer products, uses for a long time and easily cause the power line insulated hull to wear out, the Accidental occurrence such as be easy to cause that electric wire cocks off.
In process of production, the power board socket often is provided with a plurality of socket apertures and uses for information equipment and household electrical appliances equipment, when power board socket electricity consumption overload and the user can't in time receive the overload message and when continuing to use, burn through power board socket overload after a while and to cause unexpected outage, the problems such as operation information equipment data loss easily occur, and produce the puzzlement in the operation.
The utility model content
The utility model is to overcome above-mentioned weak point, and purpose is to provide the alarming current overload circuit, and this circuit can give the alarm when current overload, make the user immediately know unusually, simultaneously, this circuit can open circuit when electric current surpasses default value, and this circuit can't normally provide power supply.
The utility model is to achieve the above object by the following technical programs: the alarming current overload circuit comprises: input, output, resistor, current-sensing circuit, alarm unit; Described input is connected with power supply, for other unit of alarming current overload circuit provide power supply; Be electrically connected with input after described output and the resistor in series, output can be for electrically connecting load; Current-sensing circuit and resistor are electrically connected; Alarm unit is used for caution, and is electrically connected with the circuit detecting circuit.
As preferably, the alarming current overload circuit also includes rectification circuit, and rectification circuit is electrically connected respectively input and current-sensing circuit.
As preferably, the alarming current overload circuit also includes power supply stabilization circuit, and power supply stabilization circuit is electrically connected on the electrical connection path between rectification circuit and the current-sensing circuit.
As preferably, the alarming current overload circuit also includes breaking units, and breaking units is electrically connected respectively input and output, and when the current value by breaking units during greater than second default value, breaking units forms off state.
As preferably, described current-sensing circuit comprises: amplifying circuit, comparison circuit; Described amplifying circuit is connected with comparison circuit, and the input of amplifying circuit is in parallel with resistor, and the output of comparison circuit and alarm unit are electrically connected, and amplifying circuit, comparison circuit also are electrically connected with power supply stabilization circuit.
As preferably, described alarm unit comprises: electronic power switch, siren; Described electronic power switch is connected with siren, and the output of electronic power switch and comparison circuit is electrically connected.
As preferably, described electronic power switch is MOSFET or BJT.
As preferably, described siren is buzzer or LED lamp.
As preferably, described output has an above supply hub, can be connected with one or more electrical equipment.
As preferably, described the first default value is selected from the A of one of following group 15 (1 ± 5%), 20 (1 ± 5%) A, 30 (1 ± 5%) A, 50 (1 ± 5%) A, 100 (1 ± 5%) A.
The beneficial effects of the utility model are: the current capacity of the utility model circuit is during greater than selected the first default value, can automatically start this alarm unit, must be noted that the use of electrical equipment with reminding user, and when current capacity during greater than default default value, then can start breaking units, and make the output can't out-put supply; Resistor of the present utility model is that the manganin material is made, and not only overall volume is less than variable resistor, and cost of manufacture is also comparatively cheap, and have low in resistance, the advantage that can bear high electric current; The utility model circuit is provided with alarm unit and breaking units, be applied to the power supply unit such as distribution box (box) in power board socket or the family no matter be, safety when also need not to worry load (such as information equipment, household electrical appliances equipment) use increases the fail safe of electricity consumption greatly.
Description of drawings
Fig. 1 is structural representation of the present utility model;
Fig. 2 is circuit theory schematic diagram of the present utility model;
Among the figure: 1, input; 2, output; 21, supply hub; 3, resistor; 4, alarm unit; 41, electronic circuit switch; 42, siren; 5, current-sensing circuit; 51, amplifying circuit; 52, comparison circuit; 6, rectification circuit; 7, breaking units; 8, power supply stabilization circuit.
Embodiment
Below in conjunction with specific embodiment the utility model is described further, but protection range of the present utility model is not limited in this:
Embodiment 1: as shown in Figure 1 and Figure 2, the alarming current overload circuit is comprised of input 1, output 2, resistor 3, alarm unit 4, current-sensing circuit 5, rectification circuit 6, breaking units 7, power supply stabilization circuit 8; Described alarm unit 4 comprises: electronic circuit switch 41, siren 42; Described current-sensing circuit 5 comprises: amplifying circuit 51, comparison circuit 52.
Wherein, input 1 provides power supply, the power supply that generally provides is civil power, input 1 be electrically connected with rectification circuit 6 again after breaking units 7 is connected, for current-sensing circuit 5 provides required direct voltage, output 2 be electrically connected with rectification circuit 6 again after resistor 3 is connected, this output 2 has at least one supply hub 21, for connecting load; Amplifying circuit 51 is connected with comparison circuit 52, and the input of amplifying circuit 51 is in parallel with resistor 3, and the output of comparison circuit 52 and alarm unit 4 are electrically connected, and amplifying circuit 51, comparison circuit 52 also are electrically connected with power supply stabilization circuit 8; Described electronic power switch 41 is connected with siren 42, and electronic power switch 41 is electrically connected with the output of comparison circuit 52; Rectification circuit 6 is electrically connected with power supply stabilization circuit 8, and power supply stabilization circuit 8 is pressed for current-sensing circuit 5 provides galvanic current.
Preferably, electronic power switch 41 can be MOSFET, BJT etc., and when electronic power switch 41 was MOSFET, comparison circuit 52 was electrically connected with the gate of MOSFET; Preferably, siren 42 is buzzer or LED lamp, and when alarm unit 4 triggered, siren sent acousto-optic, and reminding user is noted operating position.
When flowing through resistor 3, electric current can produce small AC voltage, amplifying circuit 51 can will be exported after this AC voltage amplification, then comparison circuit 52 can judge the resistor 3 of flowing through according to the AC voltage after this amplification current value whether greater than one first default value, general the first default value preferred values is 15 (1 ± 5%) A.Because resistor 3 is connected with output 2, therefore the current value that detects the resistor 3 of flowing through when comparison circuit 52 is during greater than 15 (1 ± 5%) A, the expression current overload, comparison circuit 52 meeting outputs this moment one voltage, be used for driving electronic power switch 41 and form conducting, start this attention device 42 beginning starts.
The size of the first default value of this alarming current overload circuit is mainly set by the specification of the breaking units that is complementary with distribution box, and general the first default value also may be selected to be 20 (1 ± 5%) A, 30 (1 ± 5%) A, 50 (1 ± 5%) A, 100 (1 ± 5%) A.
In order to make current-sensing circuit 5 produce dividing potential drop, whether be used for upchecking the current value of resistor 3 greater than 15 (1 ± 5%) A, except current-sensing circuit 5 and resistor 3 form in parallel, resistor 3 also selected have low in resistance, can bear the logical resistor 3 of high-current flow, resistor 3 is made by manganin.
The user is not near load when starting for fear of alarm unit 4, cause electricity consumption hidden danger, also be provided with a breaking units 7 in this alarming current overload circuit, breaking units 7 is connected on output 2 and input 1 electrical connection path, breaking units 7 is at the current value that passes through during greater than default the second default value, form off state, make this output 2 provide power supply to this load.
Above described be specific embodiment of the utility model and the know-why used; if comply with the change that conception of the present utility model is done; when its function that produces does not exceed spiritual that specification and accompanying drawing contain yet, must belong to protection range of the present utility model.
Claims (10)
1. the alarming current overload circuit is characterized in that comprising: input (1), output (2), resistor (3), current-sensing circuit (5), alarm unit (4); Described input (1) is connected with power supply, for other unit of alarming current overload circuit provide power supply; Described output (2) and resistor (3) are connected rear and input (1) is electrically connected, and output (2) can be for electrically connection load; Current-sensing circuit (5) is electrically connected with resistor (3); Alarm unit (4) is used for caution, and is electrically connected with circuit detecting circuit (5).
2. alarming current overload circuit according to claim 1 is characterized in that, also includes rectification circuit (6), and rectification circuit (6) is electrically connected respectively input (1) and current-sensing circuit (5).
3. alarming current overload circuit according to claim 2 is characterized in that, also includes power supply stabilization circuit (8), and power supply stabilization circuit (8) is electrically connected on the electrical connection path between rectification circuit (6) and the current-sensing circuit.
4. according to claim 1 or 3 described alarming current overload circuit, it is characterized in that, also include breaking units (7), breaking units (7) is electrically connected respectively input (1) and output (2), when the current value by breaking units (7) during greater than second default value, breaking units (7) forms off state.
5. alarming current overload circuit according to claim 3 is characterized in that, described current-sensing circuit (5) comprising: amplifying circuit (51), comparison circuit (52); Described amplifying circuit (51) is connected with comparison circuit (52), the input of amplifying circuit (51) is in parallel with resistor (3), the output of comparison circuit (52) and alarm unit (4) are electrically connected, and amplifying circuit (51), comparison circuit (52) also are electrically connected with power supply stabilization circuit (8).
6. alarming current overload circuit according to claim 5 is characterized in that, described alarm unit (4) comprising: electronic power switch (41), siren (42); Described electronic power switch (41) is connected with siren (42), and electronic power switch (41) is electrically connected with the output of comparison circuit (52).
7. alarming current overload circuit according to claim 5 is characterized in that, described electronic power switch (41) is MOSFET or BJT.
8. alarming current overload circuit according to claim 6 is characterized in that, described siren (42) is buzzer or LED lamp.
9. alarming current overload circuit according to claim 1 is characterized in that, described output (2) has an above supply hub, can be connected with one or more electrical equipment.
10. alarming current overload circuit according to claim 1, it is characterized in that, described the first default value is selected from the A of one of following group 15 (1 ± 5%), 20 (1 ± 5%) A, 30 (1 ± 5%) A, 50 (1 ± 5%) A, 100 (1 ± 5%) A.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320281367 CN203251068U (en) | 2013-05-20 | 2013-05-20 | A current overload alarm circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320281367 CN203251068U (en) | 2013-05-20 | 2013-05-20 | A current overload alarm circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203251068U true CN203251068U (en) | 2013-10-23 |
Family
ID=49377486
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320281367 Expired - Fee Related CN203251068U (en) | 2013-05-20 | 2013-05-20 | A current overload alarm circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203251068U (en) |
-
2013
- 2013-05-20 CN CN 201320281367 patent/CN203251068U/en not_active Expired - Fee Related
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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: 20131023 Termination date: 20210520 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |