CN203455400U - Current detection circuit - Google Patents
Current detection circuit Download PDFInfo
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- CN203455400U CN203455400U CN201320506147.9U CN201320506147U CN203455400U CN 203455400 U CN203455400 U CN 203455400U CN 201320506147 U CN201320506147 U CN 201320506147U CN 203455400 U CN203455400 U CN 203455400U
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Abstract
The utility model discloses a current detection circuit. The current detection circuit includes an alternate current signal acquisition module; a hall current sensor, wherein an input terminal of a circuit of the hall current sensor is connected with an output terminal of the alternate current signal acquisition module; a power supply switching circuit, which converts a single power supply into a simulation dual power supply suitable for the work of a U1 hall current sensor; an active filtering circuit, wherein an input terminal of the active filtering circuit is connected with an output terminal of the hall current sensor, and the active filtering circuit is used for converting a current signal detected by the hall current sensor into a direct current signal; and a comparison circuit, wherein an input terminal of the comparison circuit is connected with an output terminal of the active filtering circuit, an output terminal of the comparison circuit is connected with an amplification circuit, and the amplification circuit drives a relay to protect and connect to an alarm device. The current detection and protection circuit has advantages of being simple in circuit principle, being reliable, and being adjustable in a setting value.
Description
Technical field:
The utility model technology relates to a kind of New type of current testing circuit, and it can be converted to ac current signal d. c. voltage signal and detect for testing circuit.
Background technology:
Power fail safe on former shelter feed circuit is usually directly carried out with air-break overload, overcurrent protection, has the shortcomings such as precision is low, protection value is non-adjustable, alarm free indication.The requirement of using according to army, need increase a set of current detecting holding circuit of design at former power supply safety circuit device.
Utility model content:
Technical problem to be solved in the utility model be in existing power supply safety circuit device, do not have not set protection value current protection problem and a kind of current detecting holding circuit is provided.
Technical problem to be solved in the utility model can be achieved through the following technical solutions:
A current detection circuit, comprising:
One ac current signal acquisition module;
One Hall current sensor, the output terminal of ac current signal acquisition module described in the input termination of described Hall current sensor circuit;
One power-switching circuit, described power-switching circuit converts single supply to the imitative dual power supply that is applicable to the work of U1 Hall current sensor;
One active filter circuit, the output terminal of the input termination Hall current sensor of described active filter circuit, the current signal that Hall current sensor is detected converts d. c. voltage signal to;
One comparator circuit, the input end of described comparator circuit is connected to the output terminal of power filter, and the output terminal of this comparator circuit is connected with an amplifying circuit, and described amplifying circuit drives relay protection and is connected to warning device.
In a preferred embodiment of the present utility model, described power-switching circuit comprises the first resistance, the second resistance, the 3rd resistance, the first electric capacity and the second electric capacity, the first input pin of described Hall current sensor, the second input pin, the 3rd input pin, the 4th input pin, the 5th input pin and connect after connect an output pin of ac current signal acquisition module, the 6th input pin of Hall current sensor, the 7th input pin, the 8th input pin, the 9th input pin, the tenth input pin and connect after connect another output pin of ac current signal acquisition module, connect+12V of Hall current sensor power positive end, power supply negative terminal ground connection, one end of output termination the first resistance, another termination second resistance of the first resistance, the 3rd resistance, the public connecting end of the first electric capacity and the second electric capacity, the other end of the second resistance closes another termination+12V of the first electric capacity, the other end ground connection of the 3rd resistance and the second electric capacity,
Described active filter circuit comprises the 4th resistance, triode, the 3rd electric capacity, the 5th resistance, the 6th resistance, the output terminal of one termination Hall current sensor of the 4th resistance, the base stage of another termination triode of the 4th resistance, connect+12V of the collector of triode, emitter connects the public connecting end of the 5th resistance, the 6th resistance and the 3rd electric capacity, the other end of the other end of the 5th resistance and the 3rd electric capacity also connects rear ground connection, and the other end of the 6th resistance forms an output terminal of active filter circuit;
Comparator circuit comprises a potentiometer, the 4th electric capacity, the 7th resistance and bipolar comparer, one termination+the 12V of the input end of potentiometer wherein, the other end ground connection of the input end of potentiometer, the input negative terminal of the bipolar comparer of output termination, the other end of the positive termination of input the 6th resistance of bipolar comparer, the two ends of the 4th electric capacity are connected across on the positive and negative end of input of utmost point comparer, and the two ends of the 7th resistance are connected across on the input anode and output negative terminal of bipolar comparer; The output terminal of bipolar comparer is connected with an amplifying circuit, and described amplifying circuit drives relay protection and is connected to warning device.
The advantages such as it is simple, reliable that current detecting holding circuit of the present utility model has circuit theory, and setting value is adjustable.
Accompanying drawing explanation:
Fig. 1 is current detecting holding circuit schematic diagram of the present utility model.
Embodiment:
For technological means, creation characteristic that the utility model is realized, reach object and effect is easy to understand, below in conjunction with concrete diagram, further set forth embodiment of the present utility model.
Referring to Fig. 1, the current detection circuit shown in figure, comprises ac current signal acquisition module J1, Hall current sensor U1, power-switching circuit, active filter circuit, comparator circuit, amplifying circuit.
The input pin 1-5 of Hall current sensor U1 and connect after connect the output pin 1 of ac current signal acquisition module J1, the input pin 6-10 of Hall current sensor U1 and connect after connect the output pin 2 of ac current signal acquisition module J1, connect+12V of Hall current sensor U1 power positive end, power supply negative terminal ground connection.
Power-switching circuit comprises resistance R 1, R2, R3, capacitor C 1, C2; One end of the output terminal M connecting resistance R1 of Hall current sensor U1, the public connecting end of other end connecting resistance R2, the R3 of resistance R 1, capacitor C 1, C2, another termination+12V of the other end of resistance R 2 and capacitor C 1, the other end ground connection of resistance R 3 and capacitor C 2.
Active filter circuit comprises resistance R 4, R5, R6, triode Q1, capacitor C 3; The output terminal of one termination Hall current sensor U1 of resistance R 4, the base stage of another termination triode Q1, connect+12V of the collector of triode Q1, the public connecting end of emitter connecting resistance R5, R6 and capacitor C 3, the other end of the other end of resistance R 5 and capacitor C 3 also connects rear ground connection, and the other end of resistance R 6 forms an output terminal of active filter circuit.
Comparator circuit comprises a potentiometer P1, capacitor C 4, resistance R 7 and bipolar comparer N, the one termination+12V of the input end of potentiometer P1 wherein, the other end ground connection of the input end of potentiometer P1, the input negative terminal of the bipolar comparer of output termination.
The other end of the positive terminating resistor R6 of input of bipolar comparer N, the two ends of capacitor C 4 are connected across on the positive and negative end of input of utmost point comparer N, and the two ends of resistance R 7 are connected across on the input anode and output negative terminal of bipolar comparer N; The output terminal of bipolar comparer N is connected with an amplifying circuit (not shown), and amplifying circuit drives relay protection and is connected to warning device.
Whole current detecting holding circuit collects ac current signal from ac current signal acquisition module J1; through Hall current sensor U1, become d. c. voltage signal with active wave-wave processing of circuit; the size of magnitude of voltage is directly proportional to the electric current of input; send into the setting value comparison that bipolar comparer N1 and potentiometer P1 produce, when voltage signal is greater than setting value, from the output terminal of bipolar comparer N1, export noble potential to Drive and Control Circuit trip protection the audible and visual alarm of existing safety circuit.
Claims (2)
1. a current detection circuit, is characterized in that, comprising:
One ac current signal acquisition module;
One Hall current sensor, the output terminal of ac current signal acquisition module described in the input termination of described Hall current sensor circuit;
One power-switching circuit, described power-switching circuit converts single supply to the imitative dual power supply that is applicable to the work of U1 Hall current sensor;
One active filter circuit, the output terminal of the input termination Hall current sensor of described active filter circuit, the current signal that Hall current sensor is detected converts d. c. voltage signal to;
One comparator circuit, the input end of described comparator circuit is connected to the output terminal of power filter, and the output terminal of this comparator circuit is connected with an amplifying circuit, and described amplifying circuit drives relay protection and is connected to warning device.
2. a kind of current detection circuit as claimed in claim 1, it is characterized in that, described power-switching circuit comprises the first resistance, the second resistance, the 3rd resistance, the first electric capacity and the second electric capacity, the first input pin of described Hall current sensor, the second input pin, the 3rd input pin, the 4th input pin, the 5th input pin and connect after connect an output pin of ac current signal acquisition module, the 6th input pin of Hall current sensor, the 7th input pin, the 8th input pin, the 9th input pin, the tenth input pin and connect after connect another output pin of ac current signal acquisition module, connect+12V of Hall current sensor power positive end, power supply negative terminal ground connection, one end of output termination the first resistance, another termination second resistance of the first resistance, the 3rd resistance, the public connecting end of the first electric capacity and the second electric capacity, the other end of the second resistance closes another termination+12V of the first electric capacity, the other end ground connection of the 3rd resistance and the second electric capacity,
Described active filter circuit comprises the 4th resistance, triode, the 3rd electric capacity, the 5th resistance, the 6th resistance, the output terminal of one termination Hall current sensor of the 4th resistance, the base stage of another termination triode of the 4th resistance, connect+12V of the collector of triode, emitter connects the public connecting end of the 5th resistance, the 6th resistance and the 3rd electric capacity, the other end of the other end of the 5th resistance and the 3rd electric capacity also connects rear ground connection, and the other end of the 6th resistance forms an output terminal of active filter circuit;
Comparator circuit comprises a potentiometer, the 4th electric capacity, the 7th resistance and bipolar comparer, one termination+the 12V of the input end of potentiometer wherein, the other end ground connection of the input end of potentiometer, the input negative terminal of the bipolar comparer of output termination, the other end of the positive termination of input the 6th resistance of bipolar comparer, the two ends of the 4th electric capacity are connected across on the positive and negative end of input of utmost point comparer, and the two ends of the 7th resistance are connected across on the input anode and output negative terminal of bipolar comparer; The output terminal of bipolar comparer is connected with an amplifying circuit, and described amplifying circuit drives relay protection and is connected to warning device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320506147.9U CN203455400U (en) | 2013-08-19 | 2013-08-19 | Current detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320506147.9U CN203455400U (en) | 2013-08-19 | 2013-08-19 | Current detection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203455400U true CN203455400U (en) | 2014-02-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320506147.9U Expired - Fee Related CN203455400U (en) | 2013-08-19 | 2013-08-19 | Current detection circuit |
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| Country | Link |
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| CN (1) | CN203455400U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106019153A (en) * | 2016-06-30 | 2016-10-12 | 南京中车浦镇城轨车辆有限责任公司 | Current synchronization testing apparatus and method of traction motor |
| CN110928391A (en) * | 2019-11-14 | 2020-03-27 | 西安海的电子科技有限公司 | Computer host monitoring method |
-
2013
- 2013-08-19 CN CN201320506147.9U patent/CN203455400U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106019153A (en) * | 2016-06-30 | 2016-10-12 | 南京中车浦镇城轨车辆有限责任公司 | Current synchronization testing apparatus and method of traction motor |
| CN110928391A (en) * | 2019-11-14 | 2020-03-27 | 西安海的电子科技有限公司 | Computer host monitoring method |
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| Date | Code | Title | Description |
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| 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: 20140226 Termination date: 20170819 |
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| CF01 | Termination of patent right due to non-payment of annual fee |