CN108711827B - Signal processing device of leakage circuit breaker - Google Patents
Signal processing device of leakage circuit breaker Download PDFInfo
- Publication number
- CN108711827B CN108711827B CN201810393230.7A CN201810393230A CN108711827B CN 108711827 B CN108711827 B CN 108711827B CN 201810393230 A CN201810393230 A CN 201810393230A CN 108711827 B CN108711827 B CN 108711827B
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- resistor
- operational amplifier
- integrated operational
- capacitor
- grounded
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- 239000003990 capacitor Substances 0.000 claims abstract description 22
- 238000001514 detection method Methods 0.000 abstract description 4
- 230000008092 positive effect Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/26—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents
- H02H3/32—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H1/00—Details of emergency protective circuit arrangements
- H02H1/0007—Details of emergency protective circuit arrangements concerning the detecting means
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H1/00—Details of emergency protective circuit arrangements
- H02H1/0092—Details of emergency protective circuit arrangements concerning the data processing means, e.g. expert systems, neural networks
Landscapes
- Emergency Protection Circuit Devices (AREA)
- Engineering & Computer Science (AREA)
- Artificial Intelligence (AREA)
- Evolutionary Computation (AREA)
Abstract
The invention relates to a signal processing device of an electric leakage breaker. The device is characterized by comprising a signal processing circuit consisting of a leakage transformer, a release, a plurality of integrated operational amplifiers, a diode, a plurality of resistors and capacitors. The invention changes the detection and judgment of the controller of the known leakage circuit breaker by adopting the singlechip, and completes the detection of leakage current by using electronic parts such as resistors, integrated circuits and the like; the cost can be reduced, and meanwhile, the acquired signals are more stable, and the accuracy and reliability of judgment and action are higher; compared with a release adopting a singlechip, the space is saved, and the requirement of small size of the leakage circuit breaker is easier to realize.
Description
Technical Field
The invention belongs to an electric leakage breaker, and particularly relates to a signal processing device of the electric leakage breaker.
Background
Low voltage circuit breakers are used in distribution networks to mainly distribute electrical energy and protect lines, preventing power supply equipment from being damaged by faults such as overload, undervoltage, short circuit, single phase ground, etc. The leakage circuit breaker is used for protecting the electric shock of a person in a distribution line and electric equipment, and can also be used for preventing the equipment from insulating damage, ground faults and other damages. Because most of low-voltage circuit breakers are intelligent electrical appliances at present, the same as leakage circuit breakers, the leakage protection is realized by detecting leakage current signals by adopting a microprocessor. The microprocessor has many benefits, but the cost is high, the programming needs secondary cost, and the running phenomenon of the program is easy to occur.
Disclosure of Invention
The invention provides the leakage breaker signal processing device with low cost, more stable acquired signals, high accuracy and reliability of judgment and action, and aims to solve the technical problems in the prior art.
The invention adopts the technical proposal for solving the technical problems in the prior art that: the leakage transformer (ZCT) output end is connected with two ends of a first resistor (R1) and a first capacitor (C1), and one end of the first capacitor (C1) is connected with one end of a second resistor (R2) and one end of a third resistor (R3); the other end of the first capacitor (C1) is grounded; the other end of the second resistor (R2) is connected with the negative input end of the first integrated operational amplifier (U1), the negative input end of the first integrated operational amplifier (U1) is simultaneously connected with one end of a fourth resistor (R4), and the other end of the fourth resistor (R4) is connected with the output end of the first integrated operational amplifier (U1); the other end of the third resistor (R3) is connected with the negative input end of a second integrated operational amplifier (U2), and meanwhile, the negative input end of the second integrated operational amplifier (U2) is connected with the cathode end of a diode (D1) and the positive input end of the first integrated operational amplifier (U1); the anode of the diode (D1) is connected with the output end of the second integrated operational amplifier (U2), one end of a fifth resistor (R5) is connected with the positive input end of the integrated operational amplifier (U2), and the other end of the fifth resistor (R5) is grounded; one end of a seventh resistor (R7) is connected with the output end of the first integrated operational amplifier (U1), the other end of the seventh resistor (R7) is connected with the positive input end of the third integrated operational amplifier (U3) and one end of a second capacitor (C2), and the other end of the second capacitor (C2) is grounded; one end of a sixth resistor (R6) and one end of an eighth resistor (R8) are simultaneously connected with a negative input end of a third integrated operational amplifier (U3), the other end of the sixth resistor (R6) is grounded, the other end of the eighth resistor (R8) is connected with the output end of the third integrated operational amplifier (U3) and one end of a ninth resistor (R9), the other end of the ninth resistor (R9) is connected with a positive input end of a fourth integrated operational amplifier (U4) and one end of a tenth resistor (R10) and one end of a third capacitor (C3), and the other ends of the tenth resistor (R10) and the third capacitor (C3) are grounded; one end of an eleventh resistor (R11) is connected with one end of a twelfth resistor (R12) and is connected with the negative input end of the fourth integrated operational amplifier (U4), the other end of the eleventh resistor (R11) is connected with a power supply +5V, the other end of the twelfth resistor (R12) is grounded, and the fourth integrated operational amplifier (U4) is connected with the negative input end of the twelfth resistor; the output end of the integrated operational amplifier (U4) is connected with one end of a thirteenth resistor (R13), the other end of the thirteenth resistor (R13) is connected with one end of a fourteenth resistor (R14) and is simultaneously connected with the release, and the other end of the fourteenth resistor (R14) is grounded.
The invention has the advantages and positive effects that: 1. the known controllers of the leakage circuit breakers all adopt a singlechip for detection and judgment, and the detection of leakage current is finished through electronic components such as resistors, integrated circuits and the like, so that the cost can be reduced, and meanwhile, the signals acquired by circuits overlapped by the electronic components are more stable, and the accuracy and reliability of judgment and action are greatly improved; and 2, compared with a trip device adopting a singlechip, the space of the circuit trip device adopting electronic part lap joint is saved, so that the leakage circuit breaker can be characterized by small volume.
Drawings
Fig. 1 is an electrical schematic of the present invention.
Detailed Description
For a further understanding of the nature, features, and efficacy of the present invention, the following examples are set forth in order to provide a further understanding of the invention, and are intended to be described in connection with the accompanying drawings:
as shown in the figure, the output end of the leakage transformer ZCT is connected to two ends of a resistor R1 and a capacitor C1, and one end of the capacitor C1 is connected to one end of a resistor R2 and one end of a resistor R3; the other end of the resistor R2 is connected with the negative input end of the integrated operational amplifier U1, the negative input end of the integrated operational amplifier U1 is simultaneously connected with one end of the resistor R4, and the other end of the resistor R4 is connected with the output end of the integrated operational amplifier U1; the other end of the resistor R3 is connected with the negative input end of the integrated operational amplifier U2, and meanwhile, the negative input end of the U2 is connected with the cathode end of the diode D1 and the positive input end of the integrated operational amplifier U1; the anode of the diode D1 is connected with the output end of the integrated operational amplifier U2, one end of the resistor R5 is connected with the positive input end of the integrated operational amplifier U2, and the other end of the resistor R5 is connected with the ground potential; one end of the resistor R7 is connected with the output end of the integrated operational amplifier U1, the other end of the resistor R7 is connected with the positive input end of the integrated operational amplifier U3, and is simultaneously connected with one end of the capacitor C2, and the other end of the capacitor C2 is grounded; one end of the resistor R6 and one end of the resistor R8 are simultaneously connected with a negative input end of the integrated operational amplifier U3, the other end of the resistor R6 is grounded, the other end of the resistor R8 is simultaneously connected with an output end of the integrated operational amplifier U3 and one end of the resistor R9, the other end of the resistor R9 is simultaneously connected with a positive input end of the integrated operational amplifier U4 and one end of the resistor R10 and one end of the capacitor C3, and the other ends of the resistor R10 and the capacitor C3 are grounded; one end of the resistor R11 is connected with one end of the resistor R12 and is connected with the negative input end of the integrated operational amplifier U4, the other end of the resistor R11 is connected with the power supply +5V, and the other end of the resistor R12 is grounded. The output end of the integrated operational amplifier U4 is connected with one end of a resistor R13, the other end of the resistor R13 is connected with one end of a resistor R14, and meanwhile, the other end of the resistor R14 is grounded.
The principle of the invention performs the following steps: the leakage signal induced by the leakage transformer becomes a voltage signal through a resistor R3, then becomes a relatively smooth sine wave after being filtered by a capacitor C1, uo2<0, and when Ui >0, the diode D is turned off, so up1=uno2=ui, and in1=in2=0, so uo=ui. When Ui <0, uo >0, diode D is turned off, so up1=un 2=up2=0, so uo= -R2/R1 is the virtual ground, so uo= -Ui, ui is the smooth sinusoidal voltage signal, the Uo is the positive voltage signal after processing, the amplified voltage signal is amplified by the amplifying circuit composed of R6, R7, R8 and integrated op-amp U3, and the required voltage signal is obtained after voltage division by resistor R9 and resistor R10; the resistor R11 and the resistor R12 divide the voltage, the voltage signal N3 is used as the reference voltage of the comparator U4, when the P3 voltage signal exceeds the N3 reference voltage, the comparator U4 outputs high level, and the stable voltage signal is ensured to drive the release through the pull-down resistor R13 and the resistor R14.
Claims (1)
1. The utility model provides a leakage circuit breaker signal processing device, it is including electric leakage transformer, release, characterized by: the output end of the leakage transformer (ZCT) is connected with two ends of a first resistor (R1) and a first capacitor (C1), and one end of the first capacitor (C1) is connected with one end of a second resistor (R2) and one end of a third resistor (R3); the other end of the first capacitor (C1) is grounded; the other end of the second resistor (R2) is connected with the negative input end of the first integrated operational amplifier (U1), the negative input end of the first integrated operational amplifier (U1) is simultaneously connected with one end of a fourth resistor (R4), and the other end of the fourth resistor (R4) is connected with the output end of the first integrated operational amplifier (U1); the other end of the third resistor (R3) is connected with the negative input end of a second integrated operational amplifier (U2), and meanwhile, the negative input end of the second integrated operational amplifier (U2) is connected with the cathode end of a diode (D1) and the positive input end of the first integrated operational amplifier (U1); the anode of the diode (D1) is connected with the output end of the second integrated operational amplifier (U2), one end of a fifth resistor (R5) is connected with the positive input end of the integrated operational amplifier (U2), and the other end of the fifth resistor (R5) is grounded; one end of a seventh resistor (R7) is connected with the output end of the first integrated operational amplifier (U1), the other end of the seventh resistor (R7) is connected with the positive input end of the third integrated operational amplifier (U3) and one end of a second capacitor (C2), and the other end of the second capacitor (C2) is grounded; one end of a sixth resistor (R6) and one end of an eighth resistor (R8) are simultaneously connected with a negative input end of a third integrated operational amplifier (U3), the other end of the sixth resistor (R6) is grounded, the other end of the eighth resistor (R8) is connected with the output end of the third integrated operational amplifier (U3) and one end of a ninth resistor (R9), the other end of the ninth resistor (R9) is connected with a positive input end of a fourth integrated operational amplifier (U4) and one end of a tenth resistor (R10) and one end of a third capacitor (C3), and the other ends of the tenth resistor (R10) and the third capacitor (C3) are grounded; one end of an eleventh resistor (R11) is connected with one end of a twelfth resistor (R12) and is connected with the negative input end of the fourth integrated operational amplifier (U4), the other end of the eleventh resistor (R11) is connected with a power supply +5V, the other end of the twelfth resistor (R12) is grounded, and the fourth integrated operational amplifier (U4) is connected with the negative input end of the twelfth resistor; the output end of the integrated operational amplifier (U4) is connected with one end of a thirteenth resistor (R13), the other end of the thirteenth resistor (R13) is connected with one end of a fourteenth resistor (R14) and is simultaneously connected with the release, and the other end of the fourteenth resistor (R14) is grounded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810393230.7A CN108711827B (en) | 2018-04-27 | 2018-04-27 | Signal processing device of leakage circuit breaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810393230.7A CN108711827B (en) | 2018-04-27 | 2018-04-27 | Signal processing device of leakage circuit breaker |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108711827A CN108711827A (en) | 2018-10-26 |
| CN108711827B true CN108711827B (en) | 2023-11-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810393230.7A Active CN108711827B (en) | 2018-04-27 | 2018-04-27 | Signal processing device of leakage circuit breaker |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103247489A (en) * | 2013-05-16 | 2013-08-14 | 天津市百利电气有限公司 | Circuit breaker electronic release free of grounding current sampling special instrument transformer |
| CN103683186A (en) * | 2012-09-05 | 2014-03-26 | 上海精翊电器有限公司 | Residual current breaker with self-tuning function |
| WO2016019642A1 (en) * | 2014-08-07 | 2016-02-11 | 中兴通讯股份有限公司 | Device for preventing current from flowing backward |
| CN106094964A (en) * | 2016-08-19 | 2016-11-09 | 天津市百利电气有限公司 | There is the microprocessor of electric energy sampling differential amplifier circuit |
| CN208386126U (en) * | 2018-04-27 | 2019-01-15 | 天津市百利电气有限公司 | Leakage circuit breakers executive device |
-
2018
- 2018-04-27 CN CN201810393230.7A patent/CN108711827B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103683186A (en) * | 2012-09-05 | 2014-03-26 | 上海精翊电器有限公司 | Residual current breaker with self-tuning function |
| CN103247489A (en) * | 2013-05-16 | 2013-08-14 | 天津市百利电气有限公司 | Circuit breaker electronic release free of grounding current sampling special instrument transformer |
| WO2016019642A1 (en) * | 2014-08-07 | 2016-02-11 | 中兴通讯股份有限公司 | Device for preventing current from flowing backward |
| CN106094964A (en) * | 2016-08-19 | 2016-11-09 | 天津市百利电气有限公司 | There is the microprocessor of electric energy sampling differential amplifier circuit |
| CN208386126U (en) * | 2018-04-27 | 2019-01-15 | 天津市百利电气有限公司 | Leakage circuit breakers executive device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108711827A (en) | 2018-10-26 |
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