CN217931985U - Leakage current detection device with calibration and self-checking functions based on power supply system - Google Patents
Leakage current detection device with calibration and self-checking functions based on power supply system Download PDFInfo
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- CN217931985U CN217931985U CN202221847369.2U CN202221847369U CN217931985U CN 217931985 U CN217931985 U CN 217931985U CN 202221847369 U CN202221847369 U CN 202221847369U CN 217931985 U CN217931985 U CN 217931985U
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Abstract
The utility model discloses a leakage current detection device with calibration and self-checking functions based on a power supply system, which comprises a leakage current detection ring, a self-oscillation module, a push-pull driving module, a second-order filtering module, an operational amplifier module and a singlechip; the primary side of the leakage current detection ring collects current data of a zero/live wire, the secondary side of the leakage current detection ring is connected with a self-oscillation module, a second-order filtering module and a detection resistor, the self-oscillation module is further connected with a push-pull driving module, the second-order filtering module is further connected with a single chip microcomputer through an operational amplifier, and the single chip microcomputer is connected with a switch for leakage current protection. The utility model discloses with leakage current detection device integration in electrical power generating system, use electrical power generating system's MCU to sample, self-checking and calibration the measuring signal that detection circuitry gave to realize purposes such as high accuracy leakage current detection and reduce cost.
Description
Technical Field
The utility model relates to a power technology field specifically is a take calibration and self-checking function leakage current detection device based on electrical power generating system.
Background
The current leakage detection devices in the existing power supply system are all analog, use magnetic switch devices and corresponding oscillation and filter circuits to sample the leakage current and output measurement signals, and have the defects of high cost, strong discreteness of measurement results, low leakage current measurement precision, incapability of automatic calibration, zero adjustment on power supply and the like.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a take calibration and self-checking function leakage current detection device based on electrical power generating system to solve the problem that proposes in the above-mentioned background art.
In order to achieve the above object, the utility model provides a following technical scheme:
a leakage current detection device with calibration and self-checking functions based on a power supply system comprises a leakage current detection ring, a self-oscillation module, a push-pull driving module, a second-order filtering module, an operational amplifier module and a single chip microcomputer; the primary side of the leakage current detection ring acquires current data of a zero/live wire, the secondary side of the leakage current detection ring is connected with a self-oscillation module, a second-order filtering module and a detection resistor, the self-oscillation module is further connected with a push-pull driving module, the second-order filtering module is further connected with a single chip microcomputer through an operational amplifier, and the single chip microcomputer is connected with a switch for leakage current protection.
As a further technical scheme of the utility model: the single chip microcomputer is powered by 3.3V voltage.
As a further technical solution of the present invention: the self-oscillation module, the push-pull driving module, the second-order filtering module and the operational amplifier module are powered by +/-12V voltage.
As a further technical solution of the present invention: the switch is one of a triode, an MOS tube and a relay switch.
As a further technical solution of the present invention: and a voltage stabilizing diode is connected in parallel on a circuit between the operational amplifier and the singlechip.
As a further technical solution of the present invention: the leakage current detection ring adopts a current transformer.
A self-checking calibration method of a leakage current detection device adopts the leakage current detection device, and the specific method is as follows: the method comprises the following steps that a calibration winding is added on a leakage current detection ring, 1 milliampere direct current is applied to the calibration winding to simulate leakage current to be detected, the milliampere direct current can be obtained by connecting a power supply of an MCU (microprogrammed control unit) with a fixed resistor in series, and in the initialization process of starting and powering up a power supply system, the leakage current detection device is calibrated by the following method: the milliampere-level current of X0 and X1 is applied to the calibration winding respectively, after the calibration winding passes through the low-pass filter circuit, the measured corresponding signal values are Y0 and Y1 respectively, and then when the power supply system works normally, the leakage current value Xn corresponding to the actually measured signal value can be calculated through the following formula: xn = (Yn-Y0) × (X1-X0)/(Y1-Y0).
Compared with the prior art, the beneficial effects of the utility model are that:
the utility model discloses with leakage current detection device integration in electrical power generating system, use electrical power generating system's MCU to sample, self-checking and calibration the measuring signal that detection circuitry gave to realize purposes such as high accuracy leakage current detection and reduce cost.
Drawings
Fig. 1 is a schematic circuit diagram of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts all belong to the protection scope of the present invention.
Example 1:
referring to fig. 1, a leakage current detection device with calibration and self-checking functions based on a power supply system comprises a leakage current detection ring, a self-oscillation module, a push-pull driving module, a second-order filtering module, an operational amplifier module and a single chip microcomputer; the primary side of the leakage current detection ring collects current data of a zero/live wire, the secondary side of the leakage current detection ring is connected with a self-oscillation module, a second-order filtering module and a detection resistor, the self-oscillation module is further connected with a push-pull driving module, the second-order filtering module is further connected with a single chip microcomputer through an operational amplifier, and the single chip microcomputer is connected with a switch for leakage current protection.
The working principle is as follows: when the current difference between zero and live wires of the power grid is not zero, the secondary side current of the current transformer generates a voltage value of linear current on the sampling resistor, the voltage value is superposed into a direct current component of a high-frequency spectrum through a self-oscillation circuit, a high-frequency component is filtered through a second-order low-pass filter circuit, an acquired signal is restored, the acquired signal is output to the MCU chip through an amplifying circuit for leakage current acquisition, the leakage current value exceeds a set protection limit value, and the MCU chip outputs an action signal for leakage current protection; before the leakage detection, the power is turned on for self-detection, and the current of 1mA is supplied by a transformer calibration winding for calibration.
The utility model also discloses a self-checking calibration method of leakage current detection device adopts foretell leakage current detection device, and concrete method is as follows: the method comprises the following steps that a calibration winding is added on a leakage current detection ring, 1 milliampere direct current is applied to the calibration winding to simulate leakage current to be detected, the milliampere direct current can be obtained by connecting a power supply of an MCU (microprogrammed control unit) with a fixed resistor in series, and in the initialization process of power supply system startup and electrification, the leakage current detection device is calibrated by the following method: the milliampere-level current of X0 and X1 is applied to the calibration winding respectively, after the calibration winding passes through the low-pass filter circuit, the measured corresponding signal values are Y0 and Y1 respectively, and then when the power supply system works normally, the leakage current value Xn corresponding to the actually measured signal value can be calculated by the following formula: xn = (Yn-Y0) × (X1-X0)/(Y1-Y0).
In the embodiment 2, on the basis of the embodiment 1, the singlechip is powered by 3.3V voltage. The self-oscillation module, the push-pull driving module, the second-order filtering module and the operational amplifier module are powered by +/-12V voltage. The switch is one of a triode, an MOS tube and a relay switch. And a voltage stabilizing diode is connected in parallel on a circuit between the operational amplifier and the singlechip. The leakage current detection ring adopts a current transformer.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present specification describes embodiments, not every embodiment includes only a single embodiment, and such description is for clarity purposes only, and it is to be understood that all embodiments may be combined as appropriate by one of ordinary skill in the art to form other embodiments as will be apparent to those of skill in the art from the description herein.
Claims (5)
1. A leakage current detection device with calibration and self-checking functions based on a power supply system comprises a leakage current detection ring, a self-oscillation module, a push-pull driving module, a second-order filtering module, an operational amplifier module and a single chip microcomputer; the leakage current detection circuit is characterized in that the primary side of the leakage current detection ring acquires current data of a zero/live wire, the secondary side of the leakage current detection ring is connected with a self-oscillation module, a second-order filtering module and a detection resistor, the self-oscillation module is further connected with a push-pull driving module, the second-order filtering module is further connected with a single chip microcomputer through an operational amplifier, and the single chip microcomputer is connected with a switch for leakage current protection.
2. The leakage current detection device with the calibration and self-detection functions based on the power supply system as claimed in claim 1, wherein the single chip microcomputer is powered by a voltage of 3.3V.
3. The leakage current detection device with calibration and self-test functions based on the power supply system of claim 2, wherein the self-oscillation module, the push-pull driving module, the second-order filtering module and the operational amplifier module are all powered by ± 12V.
4. The leakage current detection device with calibration and self-test functions based on the power supply system of claim 3, wherein the switch is one of a triode, a MOS transistor and a relay switch.
5. The leakage current detection device with calibration and self-checking functions based on the power supply system of claim 1, wherein the leakage current detection ring employs a current transformer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221847369.2U CN217931985U (en) | 2022-07-18 | 2022-07-18 | Leakage current detection device with calibration and self-checking functions based on power supply system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221847369.2U CN217931985U (en) | 2022-07-18 | 2022-07-18 | Leakage current detection device with calibration and self-checking functions based on power supply system |
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| Publication Number | Publication Date |
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| CN217931985U true CN217931985U (en) | 2022-11-29 |
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| CN202221847369.2U Active CN217931985U (en) | 2022-07-18 | 2022-07-18 | Leakage current detection device with calibration and self-checking functions based on power supply system |
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| CN (1) | CN217931985U (en) |
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2022
- 2022-07-18 CN CN202221847369.2U patent/CN217931985U/en active Active
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Address after: Building A3, Binhu Yungu Innovation Park, the intersection of Sichuan Road and Nanning Road, Baohe District, Hefei City, Anhui Province, 230000 Patentee after: Anhui Xiangyu Intelligent Technology Co.,Ltd. Address before: No.206, building 1, robot industrial base, Hefei enlightenment science and Technology City, No.68 Jinxiu Avenue, Hefei Economic and Technological Development Zone, Anhui Province, 230000 Patentee before: Anhui Xiangyu Intelligent Technology Co.,Ltd. |
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