CN109813957A - Direct current leakage current detection sensing device and direct current leakage current detection system - Google Patents
Direct current leakage current detection sensing device and direct current leakage current detection system Download PDFInfo
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Abstract
The application provides a direct current leakage current detection sensing device and a direct current leakage current detection system. The direct current leakage current detection sensing device comprises a detection circuit, an operational amplification circuit and a protection circuit. When the detected equipment generates leakage current, the detection circuit can quickly sense the leakage current signal. The detection circuit may convert the leakage current signal to a differential voltage signal. The differential voltage signal is converted into a voltage signal which can be collected by an external collection device after being subjected to high-linearity operational amplification of the operational amplification circuit. In order to avoid signal interference, the direct current leakage current detection sensing device is provided with a protection circuit. The detection circuit can detect ultra-low leakage current. The direct current leakage current detection sensing device has the advantage of wide test range, and can be directly applied to the field of direct current leakage current precision detection of intelligent equipment.
Description
Technical field
This application involves technical field of electric power, detect sensing device and DC leakage more particularly to a kind of DC leakage current
Flow detection system.
Background technique
DC leakage current sensing device is an indispensable Important Components in direct current system.For the straight of equipment
Leakage current is flowed to be detected, be widely used in direct current transportation, electric power storage detection, direct current cabinet, power supply, larger medical sanitary equipment,
In the industries goods equipment such as photovoltaic, wind-power electricity generation, communication base station.After being fed back at the first time to the drain conditions of equipment, rear end
The original parts such as earth leakage protective can take measures on customs clearance at the first time, avoid accident, safe handling, production operation.
In the application of DC leakage current Precision measurement, the direct acquisition mode of resistance bridge mode or hall sensing is mostly used to fill greatly
The mode set detects DC leakage current.It may cause using the mode of the direct acquisition mode of resistance bridge mode or hall sensing device
The problem small to DC leakage current acquisition range.
Summary of the invention
Based on this, it is necessary to there is small to DC leakage current acquisition range ask for Traditional DC leakage current test technology
Topic provides a kind of DC leakage current detection sensing device and DC leakage current detection system.
A kind of DC leakage current detection sensing device, comprising:
Detection circuit is converted to differential voltage for detecting DC leakage current signal, and by the DC leakage current signal
Signal；
Operational amplification circuit is electrically connected with the detection circuit, for carrying out voltage conversion to the difference voltage signal；
And
Circuit is protected, is electrically connected with the operational amplification circuit, after preventing external equipment from converting to the voltage
The interference of difference voltage signal.
The detection circuit includes: in one of the embodiments,
Current-to-voltage convertor is electrically connected with the operational amplification circuit.
The current-to-voltage convertor includes: in one of the embodiments,
Multiple resistance devices, a resistance device are connected with other resistance devices.
The detection circuit in one of the embodiments, further include:
Voltage follower is electrically connected between the current-to-voltage convertor and the operational amplification circuit.
The voltage range of the difference voltage signal of the operational amplification circuit output is in one of the embodiments,
0V-3V。
The protection circuit includes: in one of the embodiments,
Isolation protector is electrically connected with the operational amplification circuit.
The Isolation protector includes: in one of the embodiments,
Electro-optical conversioning device, one end of the electro-optical conversioning device are electrically connected with the operational amplification circuit；And
The other end of electrooptical device, one end of the electrooptical device and the electro-optical conversioning device couples.
The protection circuit in one of the embodiments, further include:
Limited amplitude protection device is electrically connected with the other end of the electrooptical device.
In one of the embodiments, further include:
Regulated power supply, the detection circuit, the operational amplification circuit and the protection circuit are electric with the pressure stabilizing
Source electrical connection.
A kind of DC leakage current detection sensing device, comprising:
Current-to-voltage convertor；
Voltage follower is electrically connected with the current-to-voltage convertor；
Operational amplification circuit is electrically connected with the voltage follower；
Isolation protector is electrically connected with the operational amplification circuit；And
Limited amplitude protection device is electrically connected with the Isolation protector.
A kind of DC leakage current detection system is detected including DC leakage current described in any one of above-described embodiment and is sensed
Device.
The application provides a kind of DC leakage current detection sensing device and DC leakage current detection system.The DC leakage
Stream detection sensing device includes detection circuit, operational amplification circuit and protection circuit.When tested equipment generates leakage current, institute
The leakage current signal can quickly be sensed by stating detection circuit.The leakage current signal can be converted to difference by the detection circuit
Dynamic voltage signal.For the difference voltage signal after the High Linear operation amplifier of the operational amplification circuit, being converted to can be by
The voltage signal of external acquisition equipment acquisition.In order to avoid signal interference, the DC leakage current detection sensing device configuration
Protection circuit.The detection circuit can detecte ultralow leakage current.The DC leakage current detection sensing device has survey
The wide advantage of range is tried, the DC leakage current that the DC leakage current detection sensing device can be applied directly to smart machine is accurate
Detection field.
Detailed description of the invention
Fig. 1 is that a kind of DC leakage current that the application one embodiment provides detects sensing device structure chart；
Fig. 2 is that a kind of DC leakage current that the application one embodiment provides detects sensing device structure chart；
Fig. 3 is that a kind of DC leakage current that the application one embodiment provides detects sensing device structure chart.
Main element drawing reference numeral explanation
DC leakage current detects sensing device 100
Detection circuit 10
Current-to-voltage convertor 11
Resistance device 111
Voltage follower 12
Operational amplification circuit 20
Protect circuit 30
Isolation protector 31
Electro-optical conversioning device 311
Electrooptical device 312
Limited amplitude protection device 32
Regulated power supply 40
Specific embodiment
In order to make the above objects, features, and advantages of the present application more apparent, with reference to the accompanying drawing to the application
Specific embodiment be described in detail.Many details are explained in the following description in order to fully understand this Shen
Please.But the application can be implemented with being much different from other way described herein, those skilled in the art can be not
Similar improvement is done in the case where violating the application intension, therefore the application is not limited by following public specific implementation.
It should be noted that it can directly on the other element when element is referred to as " being set to " another element
Or there may also be elements placed in the middle.When an element is considered as " connection " another element, it, which can be, is directly connected to
To another element or it may be simultaneously present centering elements.
Unless otherwise defined, all technical and scientific terms used herein and the technical field for belonging to the application
The normally understood meaning of technical staff is identical.The term used in the description of the present application is intended merely to description tool herein
The purpose of the embodiment of body, it is not intended that in limitation the application.Term " and or " used herein includes one or more phases
Any and all combinations of the listed item of pass.
Referring to Figure 1, the application one embodiment provides a kind of DC leakage current detection sensing device 100.The direct current
Leakage current test sensing device 100 includes detection circuit 10, operational amplification circuit 20 and protection circuit 30.
The detection circuit 10 is converted to the DC leakage current signal differential for detecting DC leakage current signal
Voltage signal.The operational amplification circuit 20 is electrically connected with the detection circuit 10.The operational amplification circuit 20 is used for institute
It states difference voltage signal and carries out voltage conversion.The protection circuit 30 is electrically connected with the operational amplification circuit 20.The protection
Circuit 30 is used for the interference for preventing external equipment to the difference voltage signal after voltage conversion.When tested equipment generates leakage
When electric current, the detection circuit 10, the operational amplification circuit 20 and the protection circuit 30 are electrically connected with regulated power supply 40
It connects, the regulated power supply is used to power to the detection circuit 10, the operational amplification circuit 20 and the protection circuit 30.
The detection circuit 10 can quickly sense the leakage current signal.And the detection circuit 10 converts the leakage current signal
For difference voltage signal.The difference voltage signal is after the operational amplification circuit 20 does subtraction, by the differential electricity
Pressure signal operation is amplified to the voltage range that can be acquired by external acquisition equipment.The differential voltage by after operation amplifier is believed
It, can be by the external acquisition equipment acquisition number through isolation, after buffer protection.
It is appreciated that the specific structure of the detection circuit 10 is not specifically limited.As long as when tested equipment generates leakage
When electric current, the detection circuit 10 can detecte the leakage current.And the detection circuit 10 can be by small electric leakage
Circulation is changed to difference voltage signal.The specific structure of the detection circuit 10, can be selected according to actual needs.?
In an optional embodiment, the detection circuit 10 can be made of signal adapter and a buffer.
It is appreciated that the specific structure of the operational amplification circuit 20 is not specifically limited.As long as the differential voltage letter
Number amplified obtained amplification voltage signal and the leakage current have High Linear.The tool of the operational amplification circuit 20
Body structure can be selected according to actual needs.In an alternative embodiment, the operational amplification circuit 20 can be by crystalline substance
Body Guan Zucheng.In an alternative embodiment, the operational amplification circuit 20 can be made of vacuum tube.It is optional real at one
It applies in example, the operational amplification circuit 20 can be made of discrete element.In an alternative embodiment, the operation amplifier
Circuit 20 can be also made of ic component.
It is appreciated that the specific structure of the protection circuit 30 is not specifically limited.As long as the protection circuit 30 can incite somebody to action
The amplified voltage signal is opened with external acquisition equipment blocking, in case external acquisition equipment believes the amplified voltage
Number generate interference, influence detection accuracy.And the amplified voltage signal can be by after the protection circuit 30
External acquisition equipment acquisition, and then demodulate the leakage current signal.In an alternative embodiment, the protection circuit 30
It can be made of photoelectric isolating circuit and amplitude limiter circuit.In an alternative embodiment, the protection circuit 30 can also be by
Relay isolation circuit and amplitude limiter circuit composition.In an alternative embodiment, the protection circuit 30 can also be by transformation
Device isolation circuit and amplitude limiter circuit composition.In an alternative embodiment, the protection circuit 30 can also be amplified by isolation
Device and amplitude limiter circuit composition.In an alternative embodiment, the amplitude limiter circuit can for limiter diode or it is other can be with
Realize the circuit of clipping effect.
In the present embodiment, the DC leakage current detection sensing device 100 includes detection circuit 10, operational amplification circuit 20
With protection circuit 30.When tested equipment generates leakage current, the detection circuit 10 can quickly sense the leakage current letter
Number.And the leakage current signal is converted to difference voltage signal by the detection circuit 10.Described in the difference voltage signal warp
After the High Linear operation amplifier of operational amplification circuit 20, the voltage signal that can be acquired by external acquisition equipment is converted to.For
Signal interference is avoided, the DC leakage current detection sensing device is configured with protection circuit 30.The detection circuit 10 can be with
Detect ultralow leakage current.The DC leakage current detection sensing device 100 has the wide advantage of test scope, the direct current leakage
Current detecting sensing device 100 can be applied directly to the DC leakage current Precision measurement field of smart machine.
Fig. 2 is referred to, in one embodiment, the detection circuit 10 includes current-to-voltage convertor 11.
The current-to-voltage convertor 11 is electrically connected with the operational amplification circuit 20.It is appreciated that the Current Voltage
The specific structure of converter 11 is not specifically limited.As long as the current-to-voltage convertor 11 may be implemented to detect ultralow leakage current
Detection, and the ultralow leakage current is converted into difference voltage signal.The difference voltage signal and the ultralow leakage
Electric current has linear relationship.In one alternate embodiment, the current-to-voltage convertor 11 can be high-accuracy resistance.
It is appreciated that the particular number of the current-to-voltage convertor 11 is not specifically limited.As long as can guarantee ultralow leakage
Electric current can be detected by the current-to-voltage convertor 11 and be converted to difference voltage signal.In an alternative embodiment
In, the current-to-voltage convertor 11 can be one.In one alternate embodiment, the current-to-voltage convertor 11 can also
Think multiple.
It is appreciated that in an alternative embodiment, a resistance device 111 in multiple resistance devices 111 and its
His resistance device 111 forms the current-to-voltage convertor 11 after connecting.It is described when detecting the DC leakage current of tested device
One end of current-to-voltage convertor 11 is electrically connected with the input terminal of the tested device, the current-to-voltage convertor 11 it is another
End is electrically connected with the output end of the tested device, to constitute a leakage current circuit.The electric leakage flows through the multiple resistance
Device 111 is converted into difference voltage signal.The multiple resistance device 111 can be high-accuracy resistance.The high-precision cipher telegram
The resistance error of resistance is low, and thermal stability is high.The high-accuracy resistance can be provided with to realize the high-precision detection of leakage current
The condition of benefit.
In the present embodiment, the current-to-voltage convertor 11 and the input, output end of the tested device are connected in series.
Using the high-precision transfer characteristic of the current-to-voltage convertor 11, to improve the difference voltage signal and the electric leakage
The linearity of stream.
In one embodiment, the detection circuit 10 further includes voltage follower 12.
The voltage follower 12 is electrically connected between the current-to-voltage convertor 11 and the operational amplification circuit 20.
It is appreciated that the specific structure of the voltage follower 12 is not specifically limited.As long as the difference voltage signal
It can not be by the load disturbance detection accuracy in the operational amplification circuit 20.The specific knot of the voltage follower 12
Structure can be selected according to actual needs.In an alternative embodiment, the voltage follower 12 can be Gao Gongmo
Differential voltage follower.The differential follower of high common-mode voltage can be connected in parallel on the both ends of the high-accuracy resistance.With
In one difference voltage signal equal with the voltage at the high-accuracy resistance both ends of output.Down to 1mA electric leakage flow through it is described
Detection circuit 10 can be converted to the difference voltage signal of 0V-5V after detecting.The difference voltage signal is through the operation amplifier
Voltage range after 20 operation amplifier of circuit is 0V-3V.
In the present embodiment, difference voltage signal and the leakage current after 20 operation amplifier of operational amplification circuit have
There is High Linear.The differential follower of high common-mode voltage has the characteristic of high impedance.The differential follower one of high common-mode voltage
Aspect can carry out buffering shaping to the difference voltage signal.The differential follower of the high common-mode voltage on the other hand can be every
Influence from the signal fallen in the operational amplification circuit 20 to the leakage current test precision.
Please also refer to Fig. 3, in one embodiment, the protection circuit 30 includes Isolation protector 31.
The Isolation protector 31 is electrically connected with the operational amplification circuit 20.It is appreciated that the Isolation protector 31
Specific structure be not specifically limited.As long as the Isolation protector 31 can be by the amplified voltage signal and external acquisition
Equipment blocking is opened, in order to avoid external acquisition equipment generates interference to the amplified voltage signal, influences detection accuracy.?
In an optional embodiment, the Isolation protector 31 can be photoelectric isolating circuit.In an alternative embodiment, institute
Stating Isolation protector 31 can also be relay isolation circuit.In an alternative embodiment, the Isolation protector 31 is gone back
It can be transformer isolation circuit.In an alternative embodiment, the Isolation protector 31 can also be by isolated amplifier
It is formed with amplitude limiter circuit.In an alternative embodiment, the Isolation protector 31 is photoelectric isolating circuit.The photoelectricity every
It include electro-optical conversioning device 311 and electrooptical device 312 from circuit.One end of the electro-optical conversioning device 311 and the fortune
Amplifying circuit 20 is calculated to be electrically connected.The other end coupling of one end of the electrooptical device 312 and the electro-optical conversioning device 311
It connects.
It is appreciated that the specific structure of the electrooptical device 312 is not specifically limited.In an alternative embodiment
In, the electrooptical device 312 can be transistor.In one alternate embodiment, the electrooptical device 312 may be used also
Think thyristor.The electro-optical conversioning device 311 is used as light-emitting component.The photo-electric conversion element 312 is used as light receiving element.It will
The light-emitting component and the light receiving element are combined, and realize the conversion of electrical-optical-electrical." light " this link is utilized to complete
Isolation features, make input difference voltage signal with through the Isolation protector 31 output after difference voltage signal be completely every
From.
It, will be amplified described differential through the operational amplification circuit 20 by the Isolation protector 31 in the present embodiment
Voltage signal and the difference voltage signal after the Isolation protector 31 output are completely isolated.The Isolation protector 31 is effectively
The case where avoiding external acquisition equipment and generate interference to the amplified voltage signal, and then influencing detection accuracy occurs.
The protection circuit 30 further includes limited amplitude protection device 32 in one of the embodiments,.The limited amplitude protection device 32
It is electrically connected with the other end of the electrooptical device 312.It is appreciated that the specific structure of the limited amplitude protection device 32 does not do and has
Body limits.As long as the amplified voltage signal can be acquired after the limited amplitude protection device 32 by external acquisition equipment, into
And demodulate the leakage current signal.The specific structure of the limited amplitude protection device 32, can be selected according to actual needs
It selects.In an alternative embodiment, the limited amplitude protection device 32 can be limiter diode.Since diode has switch special
Property, it is described when the difference voltage signal after the Isolation protector 31 is higher or lower than the threshold voltage of the diode
Diode cut-off.It is higher than the threshold voltage at this time or cannot be exported lower than the differential wave of the threshold voltage.It is described
Certain devices when the difference voltage signal excessively high damage acquisition equipment can be effectively prevented in limited amplitude protection device 32.
The application one embodiment provides a kind of DC leakage current detection sensing device 100.The DC leakage current detection
Sensing device 100 includes current-to-voltage convertor 11, voltage follower 12, operational amplification circuit 20, Isolation protector 31 and limit
Width protector 32.
The voltage follower 12 is electrically connected with the current-to-voltage convertor 11.The operational amplification circuit 20 with it is described
Voltage follower 12 is electrically connected.The Isolation protector 31 is electrically connected with the operational amplification circuit 20.The limited amplitude protection device
32 are electrically connected with the Isolation protector 31.
The current-to-voltage convertor 11, the voltage follower 12, the operational amplification circuit 20, the insulation blocking
The specific structure and embodiment and the current-to-voltage convertor in above-described embodiment of device 31 and the limited amplitude protection device 32
11, the tool of the voltage follower 12, the operational amplification circuit 20, the Isolation protector 31 and the limited amplitude protection device 32
Body structure is similar with embodiment.Details are not described herein again.
In the present embodiment, realized by the current-to-voltage convertor 11 and being used cooperatively for the operational amplification circuit 20
The leakage current acquisition of wide scope.The voltage follower 12 and the Isolation protector 31 realize input signal, output signal
Isolation, improve detection accuracy.The DC leakage current detection sensing device 100 is arranged in the limiter protection circuit 32
Between output end and external acquisition equipment.The limiter protection circuit 32 is for effectivelying prevent when the difference voltage signal is excessively high
Damage certain devices of the acquisition equipment.
The application one embodiment provides a kind of DC leakage current detection system.Including described in any one of above-described embodiment
DC leakage current detect sensing device 100.The structure and embodiment of DC leakage current detection sensing device 100 with it is upper
The structure for stating DC leakage current detection sensing device 100 described in any one embodiment is similar with embodiment.It is no longer superfluous herein
It states.The difference voltage signal that the DC leakage current detection sensing device 100 exports is by the DC leakage current detection system
Acquisition equipment acquisition, the digital signal of the leakage current is converted to through analog-to-digital conversion.
Each technical characteristic of embodiment described above can be combined arbitrarily, for simplicity of description, not to above-mentioned reality
It applies all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited
In contradiction, all should be considered as described in this specification.
The several embodiments of the application above described embodiment only expresses, the description thereof is more specific and detailed, but simultaneously
The limitation to claim therefore cannot be interpreted as.It should be pointed out that coming for those of ordinary skill in the art
It says, without departing from the concept of this application, various modifications and improvements can be made, these belong to the protection of the application
Range.Therefore, the scope of protection shall be subject to the appended claims for the application patent.
Claims (11)
1. a kind of DC leakage current detects sensing device (100) characterized by comprising
Detection circuit (10) is converted to differential voltage for detecting DC leakage current signal, and by the DC leakage current signal
Signal；
Operational amplification circuit (20) is electrically connected with the detection circuit (10), for carrying out voltage to the difference voltage signal
Conversion；And
It protects circuit (30), is electrically connected with the operational amplification circuit (20), for preventing external equipment from converting to the voltage
The interference of difference voltage signal afterwards.
2. DC leakage current according to claim 1 detects sensing device (100), which is characterized in that the detection circuit
(10) include:
Current-to-voltage convertor (11) is electrically connected with the operational amplification circuit (20).
3. DC leakage current according to claim 2 detects sensing device (100), which is characterized in that the Current Voltage
Converter (11) includes:
Multiple resistance devices (111), a resistance device (111) are connected with other resistance devices (111).
4. DC leakage current according to claim 3 detects sensing device (100), which is characterized in that the detection circuit
(10) further include:
Voltage follower (12) is electrically connected between the current-to-voltage convertor (11) and the operational amplification circuit (20).
5. DC leakage current according to claim 1 detects sensing device (100), which is characterized in that the operation amplifier
The voltage range of the difference voltage signal of circuit (20) output is 0V-3V.
6. DC leakage current according to claim 1 detects sensing device (100), which is characterized in that the protection circuit
(30) include:
Isolation protector (31) is electrically connected with the operational amplification circuit (20).
7. DC leakage current according to claim 6 detects sensing device (100), which is characterized in that the insulation blocking
Device (31) includes:
Electro-optical conversioning device (311), one end and the operational amplification circuit (20) of the electro-optical conversioning device (311) are electrically connected
It connects；And
Electrooptical device (312), one end of the electrooptical device (312) are another with the electro-optical conversioning device (311)
One end coupling.
8. DC leakage current according to claim 7 detects sensing device (100), which is characterized in that the protection circuit
(30) further include:
Limited amplitude protection device (32) is electrically connected with the other end of the electrooptical device (312).
9. DC leakage current according to claim 1 to 8 detects sensing device (100), which is characterized in that also
Include:
Regulated power supply (40), the detection circuit (10), the operational amplification circuit (20) and the protection circuit (30) are equal
It is electrically connected with the regulated power supply (40).
10. a kind of DC leakage current detects sensing device (100) characterized by comprising
Current-to-voltage convertor (11)；
Voltage follower (12) is electrically connected with the current-to-voltage convertor (11)；
Operational amplification circuit (20) is electrically connected with the voltage follower (12)；
Isolation protector (31) is electrically connected with the operational amplification circuit (20)；And
Limited amplitude protection device (32) is electrically connected with the Isolation protector (31).
11. a kind of DC leakage current detection system, which is characterized in that leaked including direct current of any of claims 1-10
Current detecting sensing device (100).
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115777068A (en) * | 2020-05-28 | 2023-03-10 | 日产自动车株式会社 | Current detection device and current detection method |
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