CN208125798U - Open type leakage current sensor - Google Patents
Open type leakage current sensor Download PDFInfo
- Publication number
- CN208125798U CN208125798U CN201820167481.9U CN201820167481U CN208125798U CN 208125798 U CN208125798 U CN 208125798U CN 201820167481 U CN201820167481 U CN 201820167481U CN 208125798 U CN208125798 U CN 208125798U
- Authority
- CN
- China
- Prior art keywords
- resistance
- connect
- triode
- power supply
- diode
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Landscapes
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The utility model discloses a kind of open type leakage current sensors, it is connect including square-wave oscillator circuit, first diode, primary winding coils, secondary winding coil, two magnetic cores, bandpass filter, operational amplifier, phase-sensitive detector, low-pass filter, DC signal output mouth and stand-by power supply circuit, stand-by power supply circuit with operational amplifier；Stand-by power supply circuit includes the first triode, the second triode, third transistor, the first metal-oxide-semiconductor, second resistance, 3rd resistor, the 4th resistance, the 5th resistance, the 6th resistance, the 7th resistance, first capacitor and DC power supply, the base stage of first triode is connect by second resistance with operational amplifier, the emitter of first triode is grounded, and the collector of the first triode is connect with one end of one end of first capacitor and the 4th resistance respectively.The open type leakage current sensor for implementing the utility model, has the advantages that：Circuit structure is relatively simple, cost is relatively low, the safety and reliability of circuit is higher.
Description
Technical field
The utility model relates to sensor field, in particular to a kind of open type leakage current sensor.
Background technique
Leakage current sensor be it is a kind of according to mutual inductor electromagnetic isolation, magnetic modulation working principle by tested exchange micro-current,
The device of the standard analog signals such as DC current, the DC voltage of DC isolation conversion linearly or RS485 digital signal.
Be widely used in direct current and ac power supply system bus and each branch insulation situation real-time monitoring.Traditional leakage current sensor
Power pack structure is complicated, hardware cost is higher.In addition, the power pack of traditional leakage current sensor is corresponding due to lacking
Circuit protection function, cause the safety and reliability of circuit not high.
Utility model content
The technical problem to be solved by the present invention is in view of the above drawbacks of the prior art, provide a kind of circuit knot
Structure is relatively simple, cost is relatively low, the higher open type leakage current sensor of the safety and reliability of circuit.
Technical solution adopted by the utility model to solve its technical problems is：Construct a kind of open type leakage current sensing
Device, including square-wave oscillator circuit, first diode, primary winding coils, secondary winding coil, two magnetic cores, bandpass filter,
Operational amplifier, phase-sensitive detector, low-pass filter, DC signal output mouth and stand-by power supply circuit, the first winding line
Circle, which is played a reversed role, to be looped around on two magnetic cores, and the secondary winding coil, which is just being gone here and there, to be looped around on two magnetic cores, the square wave
One end of oscillating circuit is connect with the anode of the first diode, the cathode of the first diode and the first winding line
One end of circle connects, and the other end of the primary winding coils is connect with one end of the first resistor, the first resistor
Other end ground connection, one end of the secondary winding coil are connect with one end of the bandpass filter, the secondary winding coil
Other end ground connection, the other end of the bandpass filter connect with one end of the operational amplifier, the operational amplifier
The other end connect with one end of the phase-sensitive detector, the one of the other end of the phase-sensitive detector and the low-pass filter
End connection, the other end of the low-pass filter connect with the DC signal output mouth, the stand-by power supply circuit with it is described
Operational amplifier connection；
The stand-by power supply circuit includes the first triode, the second triode, third transistor, the first metal-oxide-semiconductor, the second electricity
Resistance, 3rd resistor, the 4th resistance, the 5th resistance, the 6th resistance, the 7th resistance, first capacitor and DC power supply, the described 1st
The base stage of pole pipe is connect by the second resistance with the operational amplifier, the emitter ground connection of first triode, institute
The collector for stating the first triode is connect with one end of one end of the first capacitor and the 4th resistance respectively, the 4th resistance
The other end connect with the collector of second triode, one end of the base stage of second triode and the 3rd resistor
Connection, the other end of the 3rd resistor respectively with the emitter of second triode, one end of the 6th resistance, the 7th resistance
One end connected with DC power supply, the other end of the first capacitor respectively with one end of the 5th resistance and third transistor
Base stage connection, the emitter ground connection of the other end of the 5th resistance and third transistor, the current collection of the third transistor
Pole is connect with the grid of the other end of the 6th resistance and the first metal-oxide-semiconductor respectively, the source electrode of first metal-oxide-semiconductor and described the
The other end of seven resistance connects, and the drain electrode of first metal-oxide-semiconductor is connect with the anode of second diode, the two or two pole
The minus earth of pipe, the model 1N5408 of the first diode, the resistance value of the first resistor are 25k Ω, described first
The capacitance of capacitor is 300pF, and the resistance value of the 7th resistance is 20k Ω.
In open type leakage current sensor described in the utility model, the stand-by power supply circuit further includes the three or two pole
Pipe, the cathode of the third diode are connect with the emitter of second triode, the anode of the third diode and institute
State DC power supply connection, the model S-183 of the third diode.
In open type leakage current sensor described in the utility model, the stand-by power supply circuit further includes the second electricity
Hold, one end of second capacitor connect with the collector of the third transistor, the other end of second capacitor with it is described
The grid of first metal-oxide-semiconductor connects, and the capacitance of second capacitor is 460pF.
In open type leakage current sensor described in the utility model, the stand-by power supply circuit further includes the 8th electricity
Resistance, one end of the 8th resistance are connect with the emitter of the third transistor, the other end ground connection of the 8th resistance, institute
The resistance value for stating the 8th resistance is 36k Ω.
In open type leakage current sensor described in the utility model, first triode is NPN type triode, institute
Stating the second triode is PNP type triode, and the third transistor is NPN type triode.
The open type leakage current sensor for implementing the utility model, has the advantages that：Due to being equipped with square wave oscillation
Circuit, first diode, primary winding coils, secondary winding coil, two magnetic cores, bandpass filter, operational amplifier, phase sensitivities
Wave detector, low-pass filter, DC signal output mouth and stand-by power supply circuit, stand-by power supply circuit include the first triode, the
Two triodes, third transistor, the first metal-oxide-semiconductor, second resistance, 3rd resistor, the 4th resistance, the 5th resistance, the 6th resistance,
Seven resistance, first capacitor and DC power supply, the stand-by power supply circuit relative to traditional power circuit, the component that uses compared with
It is few, hardware cost can be reduced in this way, in addition, first capacitor is used to prevent doing between the first triode and third transistor
Disturb, the 7th resistance is used to carry out current-limiting protection to the source current of the first metal-oxide-semiconductor, therefore circuit structure is relatively simple, cost compared with
Low, circuit safety and reliability is higher.
Detailed description of the invention
In order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to embodiment
Or attached drawing needed to be used in the description of the prior art is briefly described, it should be apparent that, the accompanying drawings in the following description is only
It is some embodiments of the utility model, for those of ordinary skill in the art, in the premise not made the creative labor
Under, it is also possible to obtain other drawings based on these drawings.
Fig. 1 is the structural schematic diagram in the utility model open type leakage current sensor one embodiment；
Fig. 2 is the circuit diagram of stand-by power supply circuit in the embodiment.
Specific embodiment
The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model
Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole
Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are without making creative work
Every other embodiment obtained, fall within the protection scope of the utility model.
In the utility model open type leakage current sensor embodiment, the structural representation of the open type leakage current sensor
Figure is as shown in Figure 1.In Fig. 1, which includes square-wave oscillator circuit 1, first diode D1, first winding
Coil 2, secondary winding coil 3, two magnetic cores 4, bandpass filter 5, operational amplifier 6, phase-sensitive detectors 7, low-pass filter
8, DC signal output mouth 9 and stand-by power supply circuit 10, wherein primary winding coils 2, which are played a reversed role, to be looped around on two magnetic cores 4, and two
The secondary just string of winding coil 3 is looped around on two magnetic cores 4, and one end of square-wave oscillator circuit 1 is connect with the anode of first diode D1,
The cathode of first diode D1 is connect with one end of primary winding coils 2, the other end and first resistor R1 of primary winding coils 2
One end connection, the other end ground connection of first resistor R1, one end of secondary winding coil 3 connect with one end of bandpass filter 5,
The other end of secondary winding coil 3 is grounded, and the other end of bandpass filter 5 is connect with one end of operational amplifier 6, operation amplifier
The other end of device 6 is connect with one end of phase-sensitive detector 7, and the other end of phase-sensitive detector 7 and one end of low-pass filter 8 connect
It connecing, the other end of low-pass filter 8 is connect with DC signal output mouth 9, stand-by power supply circuit 10 connect with operational amplifier 6,
For powering.
The waveform signal of one end output of square-wave oscillator circuit 1, obtains half-wave after first diode D1 shaping；Square wave
The waveform signal of the other end output of oscillating circuit 1 is used as the reference signal of phase-sensitive detector 7, the frequency and phase sensitivity of reference signal
The frequency of the input signal of wave detector 7 is identical.Half-wave is passed through as pumping signal by primary winding coils 2, secondary winding coil
3, the bimag differential module that two magnetic cores 4 are constituted carries out excitation to magnetic core 4, and conducting wire to be measured passes through bimag differential module, double
Magnetic core differential module generates detection signal and is output to bandpass filter 5；Bandpass filter 5 is used to be filtered detection signal,
Fundamental frequency signal is exported, fundamental frequency refers to the frequency of 1 output signal of square-wave oscillator circuit.
Operational amplifier 6 amplifies fundamental frequency signal, and reduces noise jamming；Phase-sensitive detector 7 is to amplified base
Frequency signal carries out detection；The reference signal of phase-sensitive detector 7 is directly provided by square-wave oscillator circuit 1.Low-pass filter 8 for pair
The signal that phase-sensitive detector 7 exports carries out smothing filtering.
It is noted that above-mentioned first diode D1 is rectifier diode in the present embodiment, first resistor R1 is current limliting
Resistance.The resistance value of the model 1N5408 of first diode D1, first resistor R1 are 25k Ω, certainly, in practical applications, the
One diode D1 can select other models to have the diode of similar functions as the case may be, and the resistance value of first resistor R1 can
To adjust accordingly as the case may be.
Fig. 2 is the circuit diagram of stand-by power supply circuit in the present embodiment, and in Fig. 2, which includes the
One triode Q1, the second triode Q2, third transistor Q3, the first metal-oxide-semiconductor M1, second resistance R2,3rd resistor R3, the 4th electricity
Hinder R4, the 5th resistance R5, the 6th resistance R6, the 7th resistance R7, first capacitor C1 and DC power supply VCC, wherein the first triode
The base stage of Q1 is connect by second resistance R2 with operational amplifier 6, the emitter ground connection of the first triode Q1, the first triode Q1
Collector connect respectively with one end of one end of first capacitor C1 and the 4th resistance R4, the other end and second of the 4th resistance R4
The collector of triode Q2 connects, and the base stage of the second triode Q2 is connect with one end of 3rd resistor R3, and 3rd resistor R3's is another
One end respectively with the emitter of the second triode Q2, one end of the 6th resistance R6, one end of the 7th resistance R7 and DC power supply VCC
Connection, the other end of first capacitor C1 are connect with the base stage of one end of the 5th resistance R5 and third transistor Q3 respectively, the 5th electricity
The other end of R5 and the emitter ground connection of third transistor Q3 are hindered, the collector of third transistor Q3 is respectively with the 6th resistance R6's
The connection of the grid of the other end and the first metal-oxide-semiconductor M1, the source electrode of the first metal-oxide-semiconductor M1 are connect with the other end of the 7th resistance R7, and first
The drain electrode of metal-oxide-semiconductor M1 is connect with the anode of the second diode D2, the minus earth of the second diode D2.
For the stand-by power supply circuit 10 compared with traditional power circuit, the component used is less, and circuit structure is more
Simply, hardware cost can be reduced in this way.First capacitor C1 is coupled capacitor, for preventing the first triode Q1 and the three or three pole
Interference between pipe Q3, the 7th resistance R7 are current-limiting resistance, carry out current-limiting protection for the source current to the first metal-oxide-semiconductor M1,
Therefore the safety and reliability of circuit is higher.It is noted that in the present embodiment, the capacitance of first capacitor C1 is
The resistance value of 300pF, the 7th resistance R7 are 20k Ω, and certainly, in practical applications, the capacitance of first capacitor C1 can be according to tool
Body situation adjusts accordingly, and the resistance value of the 7th resistance R7 can adjust accordingly as the case may be.
In the present embodiment, when the first triode Q1 collector export high level when, electric current can flow through the 6th resistance R6 and
Third transistor Q3, so that the first metal-oxide-semiconductor M1 is connected.
It is noted that the first triode Q1 is NPN type triode in the present embodiment, the second triode Q2 is positive-negative-positive
Triode, third transistor Q3 are NPN type triode.Certainly, in practical applications, the first triode Q1 may be positive-negative-positive
Triode, the second triode Q2 may be NPN type triode, and third transistor Q3 may be PNP type triode, but at this moment
The structure of circuit also will accordingly change.
In the present embodiment, which further includes third diode D3, the cathode of third diode D3 and
The emitter of two triode Q2 connects, and the anode of third diode D3 is connect with DC power supply VCC.Third diode D3 is current limliting
Diode, for carrying out current-limiting protection to the branch between the second triode Q2 and the first metal-oxide-semiconductor M1, to further enhance circuit
Safety and reliability.It is noted that in the present embodiment, the model S-183 of third diode D3, certainly, in reality
In the application of border, third diode D3 can also select diode of other models with similar functions as the case may be.
In the present embodiment, which further includes the second capacitor C2, one end and the three or three of the second capacitor C2
The collector of pole pipe Q3 connects, and the other end of the second capacitor C2 is connect with the grid of the first metal-oxide-semiconductor M1.Second capacitor C2 is coupling
Capacitor, for preventing the interference between third transistor Q3 and the first metal-oxide-semiconductor M1, with further enhance circuit safety and
Reliability.It is noted that the capacitance of the second capacitor C2 is 460pF in the present embodiment, certainly, in practical applications, the
The capacitance of two capacitor C2 can adjust accordingly as the case may be.
In the present embodiment, which further includes the 8th resistance R8, one end and the three or three of the 8th resistance R8
The emitter of pole pipe Q3 connects, the other end ground connection of the 8th resistance R8.8th resistance R8 is current-limiting resistance, for the three or three pole
The emitter current of pipe Q3 carries out current-limiting protection, so that the safety and reliability of circuit is further enhanced.It is worth one
It being mentioned that, in the present embodiment, the resistance value of the 8th resistance R8 is 36k Ω, certainly, and in practical applications, the resistance value of the 8th resistance R8
It can adjust accordingly as the case may be.
Above-mentioned square-wave oscillator circuit 1, bandpass filter 5, operational amplifier 6, phase-sensitive detector 7 and low-pass filter 8 are equal
Using structure in the prior art.
In short, in the present embodiment, the stand-by power supply circuit 10 relative to traditional power circuit, the component that uses compared with
Few, circuit structure is relatively simple, can reduce hardware cost in this way.In addition, being equipped with coupled capacitor in the stand-by power supply circuit 10
And current-limiting resistance, therefore the safety and reliability of circuit is higher.
The above is only the preferred embodiment of the utility model only, is not intended to limit the utility model, all at this
Within the spirit and principle of utility model, any modification, equivalent replacement, improvement and so on should be included in the utility model
Protection scope within.
Claims (5)
1. a kind of open type leakage current sensor, which is characterized in that including square-wave oscillator circuit, first diode, first winding
Coil, secondary winding coil, two magnetic cores, bandpass filter, operational amplifier, phase-sensitive detector, low-pass filter, direct current letter
Number delivery outlet and stand-by power supply circuit, the primary winding coils, which are played a reversed role, to be looped around on two magnetic cores, the secondary winding
Coil, which is just being gone here and there, to be looped around on two magnetic cores, and the anode of one end of the square-wave oscillator circuit and the first diode connects
It connects, the cathode of the first diode is connect with one end of the primary winding coils, the other end of the primary winding coils
It is connect with one end of first resistor, the other end ground connection of the first resistor, one end of the secondary winding coil and the band
One end of bandpass filter connects, the other end ground connection of the secondary winding coil, the other end of the bandpass filter with it is described
One end of operational amplifier connects, and the other end of the operational amplifier is connect with one end of the phase-sensitive detector, the phase
The other end of quick wave detector is connect with one end of the low-pass filter, and the other end of the low-pass filter and the direct current are believed
The connection of number delivery outlet, the stand-by power supply circuit are connect with the operational amplifier；
The stand-by power supply circuit include the first triode, the second triode, third transistor, the first metal-oxide-semiconductor, second resistance,
3rd resistor, the 4th resistance, the 5th resistance, the 6th resistance, the 7th resistance, first capacitor and DC power supply, the one or three pole
The base stage of pipe is connect by the second resistance with the operational amplifier, the emitter ground connection of first triode, described
The collector of first triode is connect with one end of one end of the first capacitor and the 4th resistance respectively, the 4th resistance
The other end is connect with the collector of second triode, and the base stage of second triode and one end of the 3rd resistor connect
Connect, the other end of the 3rd resistor respectively with the emitter of second triode, one end of the 6th resistance, the 7th resistance
One end is connected with DC power supply, the other end of the first capacitor respectively with one end of the 5th resistance and third transistor
Base stage connection, the other end of the 5th resistance and the emitter ground connection of third transistor, the collector of the third transistor
It is connect respectively with the grid of the other end of the 6th resistance and the first metal-oxide-semiconductor, the source electrode of first metal-oxide-semiconductor and the described 7th
The other end of resistance connects, and the drain electrode of first metal-oxide-semiconductor is connect with the anode of the second diode, the yin of second diode
Pole ground connection, the model 1N5408 of the first diode, the resistance value of the first resistor are 25k Ω, the first capacitor
Capacitance is 300pF, and the resistance value of the 7th resistance is 20k Ω.
2. open type leakage current sensor according to claim 1, which is characterized in that the stand-by power supply circuit further includes
Third diode, the cathode of the third diode are connect with the emitter of second triode, the third diode
Anode is connect with the DC power supply, the model S-183 of the third diode.
3. open type leakage current sensor according to claim 2, which is characterized in that the stand-by power supply circuit further includes
One end of second capacitor, second capacitor is connect with the collector of the third transistor, the other end of second capacitor
It is connect with the grid of first metal-oxide-semiconductor, the capacitance of second capacitor is 460pF.
4. open type leakage current sensor according to claim 3, which is characterized in that the stand-by power supply circuit further includes
One end of 8th resistance, the 8th resistance is connect with the emitter of the third transistor, the other end of the 8th resistance
Ground connection, the resistance value of the 8th resistance are 36k Ω.
5. open type leakage current sensor according to any one of claims 1 to 4, which is characterized in that the described 1st
Pole pipe is NPN type triode, and second triode is PNP type triode, and the third transistor is NPN type triode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820167481.9U CN208125798U (en) | 2018-01-31 | 2018-01-31 | Open type leakage current sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820167481.9U CN208125798U (en) | 2018-01-31 | 2018-01-31 | Open type leakage current sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208125798U true CN208125798U (en) | 2018-11-20 |
Family
ID=64206600
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820167481.9U Expired - Fee Related CN208125798U (en) | 2018-01-31 | 2018-01-31 | Open type leakage current sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208125798U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111665384A (en) * | 2020-05-22 | 2020-09-15 | 哈尔滨工业大学 | All-digital fluxgate type current sensor and noise suppression method thereof |
| CN114069829A (en) * | 2021-11-22 | 2022-02-18 | 北京计算机技术及应用研究所 | Double-circuit redundant power supply auto-switch and recovery circuit |
-
2018
- 2018-01-31 CN CN201820167481.9U patent/CN208125798U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111665384A (en) * | 2020-05-22 | 2020-09-15 | 哈尔滨工业大学 | All-digital fluxgate type current sensor and noise suppression method thereof |
| CN111665384B (en) * | 2020-05-22 | 2022-07-29 | 哈尔滨工业大学 | All-digital fluxgate type current sensor and noise suppression method thereof |
| CN114069829A (en) * | 2021-11-22 | 2022-02-18 | 北京计算机技术及应用研究所 | Double-circuit redundant power supply auto-switch and recovery circuit |
| CN114069829B (en) * | 2021-11-22 | 2023-09-26 | 北京计算机技术及应用研究所 | Dual-path redundant power supply self-cutting and recovering circuit |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104849649B (en) | A kind of detection method of current transformer for metering secondary circuit state | |
| CN104934931B (en) | Aftercurrent protecting equipment | |
| CN106771477B (en) | Large-caliber high-sensitivity high-voltage direct current cable leakage current detection sensor | |
| CN205562653U (en) | Current inducer | |
| CN104655919B (en) | A kind of quasi- digital direct current large current sensor of single magnetic core | |
| CN207690249U (en) | A kind of electrical fire safety monitoring device | |
| CN206038762U (en) | Electron mutual -inductor | |
| CN208125798U (en) | Open type leakage current sensor | |
| CN105717366A (en) | Online grounding resistance monitoring alarm and remote monitoring system | |
| CN204595584U (en) | Current monitoring module | |
| CN206096216U (en) | Prevent outside permanent magnetic field interference electric energy meter | |
| CN104515931B (en) | A kind of DC leakage flow sensor based on magnetic modulation | |
| CN206209447U (en) | Remote signals Acquisition Circuit and the distribution terminal being made of the circuit | |
| CN209070006U (en) | A kind of current sensor | |
| CN201078757Y (en) | Electric leakage and electric larceny recognition indicating circuit for single phase AC power supply circuitry | |
| CN107979066A (en) | Type B leakage circuit breakers and its detection method | |
| CN107490744A (en) | A kind of grounded continuous detection circuit of electric automobile power supply unit | |
| CN204287286U (en) | A kind of optical fiber control circuit in conjunction with low-power consumption photoelectric switching circuit | |
| CN201302600Y (en) | Single-phase AC power supply line electric leakage and stealing recognition and indication circuit | |
| CN205594111U (en) | Leakage detection appearance based on rogowski coil | |
| CN206020363U (en) | Two-wire bus detector | |
| CN104880987A (en) | Current monitoring module | |
| CN209471163U (en) | A kind of current collection circuit mixing instrument | |
| CN113552406A (en) | High-precision residual current detection device powered by single power supply | |
| CN106100420A (en) | A kind of pure sine wave inverter with signal isolation features |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| 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: 20181120 Termination date: 20210131 |