CN211878064U - Alternating current detection circuit and detection equipment - Google Patents
Alternating current detection circuit and detection equipment Download PDFInfo
- Publication number
- CN211878064U CN211878064U CN202020265414.8U CN202020265414U CN211878064U CN 211878064 U CN211878064 U CN 211878064U CN 202020265414 U CN202020265414 U CN 202020265414U CN 211878064 U CN211878064 U CN 211878064U
- Authority
- CN
- China
- Prior art keywords
- current
- resistor
- output end
- current transformer
- output
- 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.)
- Active
Links
Images
Landscapes
- Measurement Of Current Or Voltage (AREA)
Abstract
The utility model provides an alternating current detection circuit, which comprises a current sensor, a current-voltage conversion module, a voltage regulation module and a controller, wherein a current transformer is connected between the current output end of the current sensor and the input end of the current-voltage conversion unit; the input side circuit of the current transformer and the output side circuit of the current transformer are respectively powered by a first power supply and a second power supply which are not in common ground and are arranged independently; the grounding ends of the input side circuit of the current transformer and the output side circuit of the current transformer are not grounded; the input side circuit of the current transformer comprises a current sensor; the output side circuit of the current transformer comprises a current-voltage conversion module, a voltage regulation module and a controller. The utility model discloses in, even break down when the current detection part, can not influence the power stability and the signal stability of the treater of signal acquisition part yet. Meanwhile, the power consumption of the circuit on the output side of the current transformer is very low, and the current transformer is suitable for the field with higher requirement on power consumption or powered by a battery.
Description
Technical Field
The utility model relates to an alternating current detection circuitry and check out test set especially relate to detection circuitry and check out test set that are used for heavy current to detect.
Background
The alternating current detection generally adopts a current transmitter or a current sensor scheme, such as HAZ 4000-20000-SRI current transmitter series and LF 2010-S/SPA7 current sensor series of LEM company, both can detect alternating current, when a primary side inputs alternating current with a rated effective value, the transmitter outputs a direct current signal of 0-20mA, and the current sensor outputs an alternating current signal with an effective value of 0-400 mA (current conversion ratio is 1:5000), but the current transmitter scheme has the problem of low detection precision, can only ensure 1% of detection precision, and meanwhile, the detection response time of the current transmitter is relatively slow, the general response time is about 400ms, and the current transmitter is not suitable for the high-precision detection field and the high-speed response field;
for the field requiring high precision detection (precision is about ± 0.3%) and fast response speed, a current sensor is generally used, in which the current sensor as a current detection part is connected to a current-voltage conversion module through a cable, and an output terminal of the current-voltage conversion module is connected to a processor as a signal acquisition part, so as to acquire signals in the processor. If the current detection is required to be higher in precision (the precision is within +/-0.3%), selecting or finding a current sensor with a lower current conversion ratio of the original secondary side customized by a manufacturer (the current conversion ratio of the current sensor is 1:5000 or 1: 4000 in common use); the lower the primary-secondary conversion ratio of the current sensor, the larger the current output from the secondary when the same rated current is detected.
However, the technical solution of using a current sensor to detect an ac current in the prior art has the following drawbacks.
1) When the current detected by the current sensor is in fault states such as short circuit, overload and the like, the detected current is dozens of times of the rated current instantly, the current sensor is in overload or internal core saturation state and short circuit causes the power supply (+ 15VA, -15VA, AGND) of the current sensor to be abnormal, the power supply (+ 15VA, -15VA, AGND) of the current detection part and the power supply (3V 3A, AGND) of the signal acquisition part in the prior art supply the power to the common ground, the power supply (3V 3A, AGND) of the signal acquisition part is very easy to be interfered, once the power supply (3V 3A, AGND) is in fault, microprocessors such as MCU and the like are in uncertain sub-health state, and the whole weak current control system can be completely paralyzed finally;
2) when the physical distance between the current sensor as the current detection part and the processor as the signal acquisition part is relatively long, the power line (+ -15 VA) and the signal output line (Iout) are very easily interfered by external strong electric field and magnetic field in the case of long-distance transmission although shielded line transmission is used, and the processor as the weak current control system, such as MCU, is also very easily interfered by external interference and is in a sub-health state due to the common ground of the power supply (+ 15VA, -15VA, AGND) of the current detection part and the power supply (3V 3A, AGND) of the signal acquisition part in the prior art.
SUMMERY OF THE UTILITY MODEL
The to-be-solved problem of the utility model is to make the treater receive external disturbance easily and be in the problem of sub-health state to current alternating current detection in because current sensor's power supply and the power supply of controller are common ground, provide an alternating current detection circuitry and check out test set.
In order to solve the technical problem, the utility model discloses a technical scheme is: an alternating current detection circuit comprises a current sensor, a current-voltage conversion module, a voltage regulation module and a controller which are connected in sequence, wherein a current transformer is connected between the current output end of the current sensor and the input end of a current-voltage conversion unit;
the input side circuit and the output side circuit of the current transformer are respectively powered by a first power supply and a second power supply, and the first power supply and the second power supply are not grounded and are arranged independently;
the grounding ends of the input side circuits of the current transformers are connected with each other to form a first grounding end,
the grounding ends of the output side circuits of the current transformers are connected with each other to form a second grounding end;
the first grounding end and the second grounding end are not grounded in common;
the current transformer input side circuit comprises the current sensor;
the current transformer output side circuit comprises the current-voltage conversion module, a voltage regulation module and a controller.
The utility model discloses in, between the current sensor as current detection part and the treater as signal acquisition part, utilize current transformer to carry out electrical isolation, reduced the electromagnetic interference that current detection part introduced signal acquisition part. Moreover, because the first grounding end and the second grounding end are not grounded in common, and the first power supply and the second power supply are not grounded in common and are arranged independently, even if the current detection part breaks down, the power stability and the signal stability of the processor of the signal acquisition part cannot be influenced, the processor is prevented from being in a sub-health state, and the stability and the reliability of the whole weak current control system are improved. The current detection part and the signal acquisition part are independently used for supplying power, when large current is detected, the current detection part is powered by a high-power first power supply, the higher the detected rated current is or the lower the current conversion ratio of the current sensor is, the higher the power consumption consumed by the current sensor is, the second power supply of the signal acquisition part only supplies power to the output circuit (including a processor) of the current transformer, the power consumption is very low, so that the second power supply for supplying power to the processor does not need to supply power to the current sensor serving as the current detection part, the actual power consumption of the circuit on the output side of the current transformer is very low, and the power detection device can be suitable for the field with higher power consumption requirements or the field with power supplied by a battery.
Further, the current transformer is provided with a first input end, a second input end, a first output end and a second output end, the first input end and the second input end are connected to two ends of a primary winding of the current transformer, and the first output end and the second output end are connected to two ends of a secondary winding of the current transformer;
the input side circuit of the current transformer further comprises a first resistor R1 and a second resistor R2, the current output end of the current sensor, one end of the first resistor R1 and one end of the second resistor R2 are connected with each other, and the second input end of the current sensor is connected with the other end of the second resistor R2;
the first input end, the other end of the first resistor R1 and the first ground end are connected with each other;
the current-voltage conversion module is connected between the first output end and the second output end.
The utility model discloses in, especially to the great occasion of acquisition current, shunt the electric current of gathering through first resistance, second resistance for current transformer's input current is less, thereby can reduce the consumption of current transformer and current transformer output side circuit, reduces the condition of generating heat, guarantees circuit safety.
Further, the current-voltage conversion module includes a first operational amplifier, a third resistor R3 is connected between an output end and an inverting input end of the first operational amplifier, the inverting input end of the first operational amplifier is connected to the first output end, the second output end, the non-inverting input end of the first operational amplifier, and the second ground end are connected to each other, and the output end of the first operational amplifier is the output end of the current-voltage conversion module; or
The current-voltage conversion module comprises a fourth resistor, two ends of the fourth resistor are respectively connected with the first output end and the second output end, the second output end is connected with the second grounding end, and the first output end is the output end of the current-voltage conversion module.
The utility model discloses in, through setting up first operational amplifier, and convert the electric current into voltage through the third resistance, can increase converting circuit's the load capacity of taking.
Further, the voltage adjusting module comprises a second operational amplifier, a fifth resistor R5, a sixth resistor R6 and a seventh resistor R7, one end of the fifth resistor R5 is the input end of the voltage adjustment module, the output end of the second operational amplifier is the output end of the voltage adjustment module, the input end and the output end of the voltage adjusting module are respectively and correspondingly connected with the output end of the current-voltage converting module and the input end of the controller (3), one end of the sixth resistor R6 is connected with a power supply end of a controller, the power supply end of the controller is connected with a positive power supply input end of the second operational amplifier through a power supply voltage stabilizer, the other end of the fifth resistor R5, the other end of the sixth resistor R6 and the non-inverting input end of the second operational amplifier are connected with each other, the seventh resistor R7 is connected between the inverting input terminal and the output terminal of the second operational amplifier.
Because the voltage acquisition end input voltage range of the controller has limitation, the voltage can be adjusted to the voltage range suitable for the acquisition of the controller by arranging the voltage adjusting module.
Further, the current transformer is a 2mA/2mA current transformer.
By adopting the current transformer of 2mA/2mA, the current transformer has smaller power consumption and volume, and is particularly suitable for occasions with limited working space.
Further, the second power source is a battery.
The battery for supplying power to the controller occupies a small space, and is particularly suitable for occasions with limited working space.
The utility model also provides an alternating current check out test set, including the controller box, still include any of the above-mentioned alternating current check out test set, current transformer input side circuit sets up outside the controller box, current transformer output side circuit all set up in the controller box.
The utility model discloses in, through all setting up current transformer, current transformer output side circuit (be current transformer, controller and connect the circuit between the two promptly) in the controller box to can reduce the external interference to the controller, because the second power need not to provide the power for the current sensor who is the current detection part moreover, make current transformer output circuit's actual power consumption very low, thereby can be adapted to the field that requires higher or by battery powered to the consumption.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive labor.
Fig. 1 is a schematic circuit diagram of an ac current detection circuit according to an embodiment of the present invention.
Fig. 2 is a schematic circuit diagram of the first power supply of the embodiment of the present invention converting to ± 15V power supply.
Fig. 3 is a schematic circuit diagram of the second power supply of the embodiment of the present invention converting to ± 5V power supply;
fig. 4 is a schematic circuit diagram of the ± 5V supply to the 3.3V supply in fig. 3.
In the above drawings, 1, a current sensor, 2, a current transformer, 3, a controller, 41, a first operational amplifier, 42, a second operational amplifier, 51, a first DC/DC converter, 52, a second DC/DC converter, 53, and a power regulator.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Example 1
As shown in fig. 1 to 4, in this embodiment, an alternating current detection circuit includes a current sensor 1, a current-voltage conversion module, a voltage adjustment module, and a controller 3, which are connected in sequence, and is characterized in that: a current transformer 2 is connected between the current output end of the current sensor 1 and the input end of the current-voltage conversion unit;
an input side circuit of the current transformer 2 and an output side circuit of the current transformer 2 are respectively powered by a first power supply and a second power supply, and the first power supply and the second power supply are not grounded and are arranged independently;
the ground terminals of the input side circuits of the current transformer 2 are connected to each other to constitute a first ground terminal AGND,
the grounding ends of the circuits at the output side of the current transformer 2 are mutually connected so as to form a second grounding end GND;
the first ground terminal AGND and the second ground terminal GND are not grounded in common;
the input side circuit of the current transformer 2 comprises the current sensor 1;
the output side circuit of the current transformer 2 comprises the current-voltage conversion module, the voltage regulation module and the controller 3.
The current transformer 2 is provided with a first input end, a second input end, a first output end and a second output end, the first input end and the second input end are connected to two ends of a primary winding of the current transformer 2, and the first output end and the second output end are connected to two ends of a secondary winding of the current transformer 2;
the input side circuit of the current transformer 2 further comprises a first resistor R1 and a second resistor R2, the current output end of the current sensor 1, one end of the first resistor R1 and one end of the second resistor R2 are connected with each other, and the second input end of the current sensor is connected with the other end of the second resistor R2. In this embodiment, the resistance value of the first resistor may be 10 Ω, and the resistance value of the second resistor R2 may be 1990 Ω.
The first input terminal, the other end of the first resistor R1, and the first ground terminal AGND are connected to each other.
The current-voltage conversion module is connected between the first output end and the second output end.
The current-voltage conversion module includes a first operational amplifier 41, a third resistor R3 is connected between an output end and an inverting input end of the first operational amplifier 41, the inverting input end of the first operational amplifier 41 is connected with a first output end, the second output end, a non-inverting input end of the first operational amplifier 41, and a second ground end GND are connected with each other, and the output end of the first operational amplifier 41 is the output end of the current-voltage conversion module; or
The current-voltage conversion module comprises a fourth resistor, two ends of the fourth resistor are respectively connected with the first output end and the second output end, the second output end is connected with a second grounding end GND, and the first output end is the output end of the current-voltage conversion module.
In the present embodiment, the resistance value of the third resistor R3 may take 1k Ω.
And the input end and the output end of the voltage adjusting module are respectively and correspondingly connected with the output end of the current-voltage conversion module and the input end of the controller 3.
The voltage adjusting module comprises a second operational amplifier 42, a fifth resistor R5, a sixth resistor R6 and a seventh resistor R7, one end of the fifth resistor R5 is an input end of the voltage adjusting module, an output end of the second operational amplifier 42 is an output end of the voltage adjusting module, one end of the sixth resistor R6 is connected with a power end of the controller 3, a power end of the controller 3 is connected with a positive power input end of the second operational amplifier 42 through a power stabilizer 53, the other end of the fifth resistor R5, the other end of the sixth resistor R6 and a non-inverting input end of the second operational amplifier 42 are connected, and the seventh resistor R7 is connected between an inverting input end and an output end of the second operational amplifier 42. In this embodiment, the resistance values of the fifth resistor, the sixth resistor, and the seventh resistor are all set to 10k Ω.
The resistance values of the first resistor, the second resistor, the third resistor, the fourth resistor, the fifth resistor, the sixth resistor and the seventh resistor can be determined as required, and those skilled in the art can understand that the resistance values of the first resistor, the second resistor, the third resistor, the fourth resistor, the fifth resistor, the sixth resistor and the seventh resistor can be determined as required.
One end of the fifth resistor R5 and the output end of the second operational amplifier 42 are respectively connected to the output end of the current-voltage conversion module and the input end of the controller 3.
The current transformer 2 can adopt a current transformer of 2mA/2 mA.
The utility model also provides an alternating current check out test set, including the controller box, still include as above arbitrary alternating current check out test set circuit, 2 input side circuits of current transformer set up outside the controller box, current transformer 2, current transformer output side circuit all set up in the controller box.
Preferably, the first power supply and the second power supply are respectively arranged outside the controller box and inside the controller box.
As shown in fig. 2 to 4, the first power supply (+ 24V1, DGND 1) is converted into ± 15VA, AGND by the first DC/DC converter 51, thereby supplying power to the current sensor 1.
The second power supply (+ 24V2, DGND 2) is converted into ± 5VA, GND by the second DC/DC converter 52, thereby supplying power to the respective operational amplifiers (the first operational amplifier 41, the second operational amplifier 42) on the output side of the current transformer 2.
The first power supply (+ 24V1, DGND 1) and the second power supply (+ 24V2, DGND 2) are two different power supplies.
The +5VA and GND are converted into 3.3V (i.e. 3V 3A) by the linear power regulator 53 to supply power to the power terminal VDD of the controller 3, and the power terminal VDD of the controller 3 is connected to one end of the sixth resistor R6.
The current sensor 1 may employ an LF 2010-S/SPA7 current sensor available from LEM corporation. The controller 3 can adopt a single chip microcomputer, a DSP or an FPGA. The current transformer 2 may employ JPT 2024B. The first operational amplifier 41 and the second operational amplifier 42 may be implemented by a TI OP07 chip. The first DC/DC converter 51 may employ URA2415LD-30WR 3. The second DC/DC converter 52 may employ a URE2405P-6WR 3. The power regulator 53 may be a linear power regulator. The power regulator 53 may employ AMS 1117-3.3. The resistors R1, R2, R3, R5 and R6 can adopt high-precision 0.1% resistor patch resistors. The resistor R1 can be formed by connecting 10 resistors of 2512 packages with 100 omega and 0.1 percent in parallel, and the total resistance value after parallel connection is 10 omega. Resistors R2, R3, R5, R6 may be single 0603 package resistors, and resistor R7 may be single 0603 package 10% precision resistors.
And each operational amplifier of the circuit at the output side of the current transformer 2 can supply power for +/-5V, so that the power consumption of the circuit at the output side of the current transformer 2 is reduced. Decoupling capacitors can be arranged in parallel between the +/-5 VA power supply of the first operational amplifier 41 and the second ground terminal GND and between the +/-5 VA power supply of the second operational amplifier 42 and the second ground terminal GND, and the decoupling capacitors are as close as possible to the power supply pins of the chip during the layout of the PCB.
In the embodiment, an LF 2010-S/SPA7 current sensor of LEM corporation is selected, the current sensor is rated to measure a current with a peak value of 2000A, the rated output is 400mA, that is, the current conversion ratio is 1:5000, taking the first resistor R1=10 ohms and the second resistor R2=1990 Ω, according to the kirchhoff first law, when measuring the current of the rated 2000A, the current sensor outputs Iout and outputs 400mA of current, the current flowing into the second resistor R2 and the transformer is 2mA, the current flowing into the first resistor R1 is 398mA, and we select the current transformer CT1 as 2 mA: a third resistor R3 is powered to have a resistance value of 1K, so that an alternating voltage signal with a peak value of +/-2V is output by an output end of an operational amplifier, a digital part and an analog part of a single chip microcomputer or a DSP generally adopt a 3.3V power supply to supply power, the alternating voltage signal which is output by the operational amplifier U1 and takes 0V (GND) as a center and the peak value of +/-2V is lifted to take 1.65V as the center after being biased by 3V3A, and the alternating voltage signals with the peak values of 0.65V and 2.65V respectively are sent to an A/D conversion part of an MCU (microprogrammed control unit) to measure the magnitude of actually acquired real current. When the sufficient insulation strength between the current acquisition of the current sensor end and the current measurement of the MCU microprocessor end needs to be ensured, for example, the insulation strength of 5000VAC between the current acquisition system end and the current measurement system end needs to be ensured, only a current transformer with the original secondary side insulation strength of 10000VAC needs to be adopted;
according to the principle in fig. 1, there is almost no voltage difference between the primary and secondary windings of the transformer, i.e. UIN1-IN2And UOUT1-OUT2Are both equal to 0, so the first resistor R1 and the second resistor R2 follow kirchhoff's first law, so that at a nominal 400mA output of the current sensor, the currents flowing through the first resistor R1 and the second resistor R2 are 398mA and 2mA, respectively.
The utility model discloses in, utilize the scheme of current sensor + current transformer combination and kirchhoff's first law to detect alternating current size, not only the precision is high, and response speed is fast, still has following advantage:
1) the current detection device end of the current sensor and the MCU current acquisition end of the microprocessor are electrically isolated by using a current transformer, so that the electromagnetic interference introduced by the current detection end to the MCU microprocessor at the current acquisition end due to longer distance of a transmission line is reduced;
2) meanwhile, the current transformer is adopted to isolate the current detection end from the current collection end, and the power supply of the current detection end and the power supply of the MCU microprocessor of the current collection end are supplied with power by different independent power supplies, so that even if the current detection end fails, the power supply and signals of the MCU microprocessor of the current collection end cannot be caused, the MCU microprocessor cannot be in a sub-health state, and the stability and reliability of the whole weak current control system are improved;
3) the current sensor at the current detection end and the MCU microprocessor at the current collection end independently supply power respectively, the +/-15 VA and the AGND at the current collection end only supply power to the current sensor and are supplied power by a high-power supply, the higher the detected rated current or the lower the current conversion ratio, the higher the power consumption consumed by the current sensor is, the +/-5 VA, 3V3A and GND power supplies at the current collection end only supply power to the operational amplifier and the MCU microprocessor, the power consumption is very low, therefore, the power supply system at the MCU microprocessor end does not need to provide power for the current sensor at the current detection end, so that the actual power consumption of the current acquisition end of the MCU microprocessor is very low, the current collection scheme can be suitable for the field that the MCU microprocessor control system at the current collection end has higher requirements on power consumption or is powered by batteries (such as a control system in which +/-5 VA, GND, 3V3A and GND power supplies are all powered by lithium batteries).
Example 2
The present embodiment 2 differs from embodiment 1 in that the second power source employs a battery. The embodiment is particularly suitable for occasions with higher requirements on power consumption of the signal acquisition part or smaller requirements on the size of the controller box, so that the power supplies of +/-5 VA, GND, 3V3A and GND are all powered by batteries (such as lithium batteries). The battery may be a battery having a voltage of ± 5V, so that the second DC/DC converter 52 is not required, and the 5V voltage can be converted into the 3.3V voltage required by the controller 3 only by the power regulator 53. Other parts can refer to example 1.
It should be noted that, in the present specification, the embodiments are all described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments may be referred to each other.
The embodiments of the present invention have been described in detail, but the description is only for the preferred embodiments of the present invention and should not be construed as limiting the scope of the present invention. All equivalent changes and modifications made within the scope of the present invention should be covered by the present patent. After reading the present invention, modifications of various equivalent forms of the invention by those skilled in the art will fall within the scope of the appended claims. In the case of conflict, the embodiments and features of the embodiments of the present invention can be combined with each other.
Claims (8)
1. The utility model provides an alternating current detection circuitry, includes current sensor (1), current-voltage conversion module, voltage adjustment module, controller (3) that connect gradually, its characterized in that: a current transformer (2) is connected between the current output end of the current sensor (1) and the input end of the current-voltage conversion unit;
an input side circuit of the current transformer (2) and an output side circuit of the current transformer (2) are respectively powered by a first power supply and a second power supply, and the first power supply and the second power supply are not grounded and are arranged independently;
the grounding ends of the input side circuits of the current transformers (2) are connected with each other to form a first grounding end,
the grounding ends of the output side circuit of the current transformer (2) are connected with each other to form a second grounding end;
the first grounding end and the second grounding end are not grounded in common;
the input side circuit of the current transformer (2) comprises the current sensor (1);
the output side circuit of the current transformer (2) comprises the current-voltage conversion module, a voltage regulation module and a controller (3).
2. The alternating current detection circuit according to claim 1, wherein: the current transformer (2) is provided with a first input end, a second input end, a first output end and a second output end, the first input end and the second input end are connected to two ends of a primary winding of the current transformer (2), and the first output end and the second output end are connected to two ends of a secondary winding of the current transformer (2);
the input side circuit of the current transformer (2) further comprises a first resistor R1 and a second resistor R2, the current output end of the current sensor (1), one end of the first resistor R1 and one end of the second resistor R2 are connected with each other, and the second input end of the current sensor is connected with the other end of the second resistor R2;
the first input end, the other end of the first resistor R1 and the first ground end are connected with each other;
the current-voltage conversion module is connected between the first output end and the second output end.
3. The alternating current detection circuit according to claim 2, wherein: the current-voltage conversion module comprises a first operational amplifier (41), a third resistor R3 is connected between the output end and the inverting input end of the first operational amplifier (41), the inverting input end of the first operational amplifier (41) is connected with the first output end, the second output end, the non-inverting input end and the second grounding end of the first operational amplifier (41) are connected with each other, and the output end of the first operational amplifier (41) is the output end of the current-voltage conversion module; or
The current-voltage conversion module comprises a fourth resistor, two ends of the fourth resistor are respectively connected with the first output end and the second output end, the second output end is connected with the second grounding end, and the first output end is the output end of the current-voltage conversion module.
4. The alternating current detection circuit according to claim 1, wherein: the voltage adjusting module comprises a second operational amplifier (42), a fifth resistor R5, a sixth resistor R6 and a seventh resistor R7, one end of the fifth resistor R5 is an input end of the voltage adjusting module, an output end of the second operational amplifier (42) is an output end of the voltage adjusting module, the input end and the output end of the voltage adjusting module are correspondingly connected with an output end of the current-voltage conversion module and an input end of the controller (3), one end of the sixth resistor R6 is connected with a power supply end of the controller (3), the power supply end of the controller (3) is connected with a positive power supply input end of the second operational amplifier (42) through a power supply stabilizer (53), the other end of the fifth resistor R5, the other end of the sixth resistor R6 and a non-inverting input end of the second operational amplifier (42) are connected with each other, and the seventh resistor R7 is connected with an inverting input end, a non-inverting input end, and a non-inverting input end of the second, Between the output ends.
5. An alternating current detection circuit according to any one of claims 1 to 4, wherein: the current transformer (2) is a 2mA/2mA current transformer.
6. An alternating current detection circuit according to any one of claims 1 to 4, wherein: the second power source is a battery.
7. An alternating current detection device, comprising a controller box, characterized by further comprising the alternating current detection circuit as claimed in any one of claims 1-6, wherein the input side circuit of the current transformer (2) is arranged outside the controller box, and the current transformer (2) and the output side circuit of the current transformer (2) are arranged in the controller box.
8. The alternating current detection apparatus of claim 7, wherein the first power supply and the second power supply are respectively disposed outside the controller box and inside the controller box.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020265414.8U CN211878064U (en) | 2020-03-06 | 2020-03-06 | Alternating current detection circuit and detection equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020265414.8U CN211878064U (en) | 2020-03-06 | 2020-03-06 | Alternating current detection circuit and detection equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211878064U true CN211878064U (en) | 2020-11-06 |
Family
ID=73253861
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020265414.8U Active CN211878064U (en) | 2020-03-06 | 2020-03-06 | Alternating current detection circuit and detection equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211878064U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113933558A (en) * | 2021-10-13 | 2022-01-14 | 江苏斯菲尔电气股份有限公司 | Instrument capable of automatically identifying specification of current transformer and setting transformation ratio |
-
2020
- 2020-03-06 CN CN202020265414.8U patent/CN211878064U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113933558A (en) * | 2021-10-13 | 2022-01-14 | 江苏斯菲尔电气股份有限公司 | Instrument capable of automatically identifying specification of current transformer and setting transformation ratio |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR102032588B1 (en) | Detection of a leakage current comprising a continuous component in a vehicle | |
| US8278874B2 (en) | Apparatus and method for balancing the transfer of electrical energy from an external power source to a vehicle | |
| US20160241153A1 (en) | Converters for wind turbine generators | |
| CN211878064U (en) | Alternating current detection circuit and detection equipment | |
| KR20170098062A (en) | Fault detector for anti-parallel thyristor | |
| CN109212293B (en) | Power supply type voltage transformer with voltage metering function and use method | |
| US11320494B2 (en) | Compensation device for compensating for leakage currents | |
| US11364810B2 (en) | Monitoring device for leakage currents | |
| TWI580144B (en) | Power quality compensation system | |
| CN104319910A (en) | Power source energy taking circuit based on high-voltage power transmission line | |
| CN105811788A (en) | High potential energy supply system used for high voltage power electronic device | |
| CN102332697A (en) | Measuring transient electrical activity in aircraft power distribution systems | |
| CN211293039U (en) | AC/DC leakage current sensor | |
| CN115097182A (en) | Dual-output measurement's alternating current-direct current sensor's adapter device | |
| CN210982711U (en) | Three-phase current detection circuit and electric energy metering chip | |
| US20190326783A1 (en) | Dynamic power harvesting system | |
| EP3010134B1 (en) | Single-phase photovoltaic inverter | |
| CN104704600B (en) | Electrical switching apparatus including transductor circuit and alternating current electronic trip circuit | |
| US9977055B2 (en) | Isolation interface for an electricity meter and electricity metering system | |
| CN212808408U (en) | Sleeve pipe voltage divider device | |
| CN113985238B (en) | Control circuit for withstand voltage and ESD test, withstand voltage test method and endoscope | |
| CN215452585U (en) | High-current high-voltage conditioning circuit based on shunt voltage division and isolation amplification | |
| EP4119953A1 (en) | Health monitoring in electric motor control systems | |
| CN215005577U (en) | Distribution network alternating current sensor circuit and current sensor | |
| US11740265B1 (en) | Signal conditioning circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |