CN113904300A - Residual current protector with self-checking function - Google Patents
Residual current protector with self-checking function Download PDFInfo
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- CN113904300A CN113904300A CN202111086477.2A CN202111086477A CN113904300A CN 113904300 A CN113904300 A CN 113904300A CN 202111086477 A CN202111086477 A CN 202111086477A CN 113904300 A CN113904300 A CN 113904300A
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- 230000001012 protector Effects 0.000 title claims abstract description 22
- 238000001514 detection method Methods 0.000 claims abstract description 25
- 230000003750 conditioning effect Effects 0.000 claims abstract description 18
- 238000006243 chemical reaction Methods 0.000 claims abstract description 8
- 238000004804 winding Methods 0.000 claims description 20
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 7
- 229910052710 silicon Inorganic materials 0.000 claims description 7
- 239000010703 silicon Substances 0.000 claims description 7
- 230000005284 excitation Effects 0.000 claims description 5
- 239000003990 capacitor Substances 0.000 claims description 3
- 230000005611 electricity Effects 0.000 claims description 3
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 3
- 230000001681 protective effect Effects 0.000 claims description 3
- 230000000087 stabilizing effect Effects 0.000 claims description 3
- MKGHDZIEKZPBCZ-ULQPCXBYSA-N methyl (2s,3s,4r,5r,6r)-4,5,6-trihydroxy-3-methoxyoxane-2-carboxylate Chemical compound CO[C@H]1[C@H](O)[C@@H](O)[C@H](O)O[C@@H]1C(=O)OC MKGHDZIEKZPBCZ-ULQPCXBYSA-N 0.000 claims 11
- 230000000694 effects Effects 0.000 description 4
- 230000001052 transient effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
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- 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
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/52—Testing for short-circuits, leakage current or ground faults
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Emergency Protection Circuit Devices (AREA)
- Breakers (AREA)
Abstract
一种具有自检功能的剩余电流保护器，主要由直流工作电源电路、剩余电流信号检测电路、脱扣保护电路、漏电保护电路和自检电路组成，所述自检电路主要由剩余电流互感器、调理电路、单片机MCU和自检驱动电流发生电路组成，自检驱动电流信号经调理输入单片机MCU端口GP0，经MCU内部数模转换、比较，从GP3端口输出灯光报警信号。本自检电路能实时检测保护器自身的剩余电流信号检测电路、漏电保护电路和脱扣保护电路是否处于正常工作状态，以确保其工作的可靠性，大大提高了对人身安全的保护。
A residual current protector with self-checking function is mainly composed of a DC working power supply circuit, a residual current signal detection circuit, a tripping protection circuit, a leakage protection circuit and a self-checking circuit. The self-checking circuit is mainly composed of a residual current transformer. It is composed of a conditioning circuit, a single-chip MCU and a self-checking driving current generating circuit. The self-checking driving current signal is input to the MCU port GP 0 of the single-chip microcomputer through conditioning, and the light alarm signal is output from the GP 3 port through the internal digital-analog conversion and comparison of the MCU. The self-test circuit can detect whether the residual current signal detection circuit, leakage protection circuit and tripping protection circuit of the protector are in normal working condition in real time, so as to ensure the reliability of its work and greatly improve the protection of personal safety.
Description
Technical Field
The invention relates to the technical field of electric leakage protection, in particular to a residual current protector with a self-checking function.
Background
The existing residual current protector can not detect whether the control function of the circuit is normal in real time, which is a disadvantage for being used as a terminal leakage protection device.
In the existing residual current detection circuit, only half waves of signals can be detected. In the case where a transient operation is required, 10 msec of half-wave of the signal may be lost, and the effect of the transient operation is difficult to achieve.
Disclosure of Invention
The invention aims to provide a residual current protector with a self-checking function, which not only can carry out residual current detection and over-value protection on a load, but also can carry out real-time self-checking on a detection control circuit of the protector, thereby ensuring that the protector is always in a normal and safe running state.
The technical solution proposed by the invention is as follows:
a residual current protector with a self-checking function comprises a direct current working power supply circuit, a residual current signal detection circuit, a tripping protection circuit, a leakage protection circuit and a self-checking circuit;
the direct current working power supply circuit is composed of a phase line L at the side of a power supply load1And zero line N1Two ends get electricity through the 1 st rectifier bridge ZQ1Rectification and resistance R4Capacitor C1Filter and voltage-stabilizing diode DW1The voltage-stabilized output DC5V is used as a direct-current working power supply of the MCU and the conditioning circuit of the single chip microcomputer;
the residual current signal detection circuit consists of a residual current transformer ZCT, a detection winding LD thereof and an excitation winding ZJ for self-detecting signals;
the tripping protection circuit mainly comprises a 1 st rectifier bridge ZQ1Silicon controlled rectifier Q2Trip electromagnet TQ1And a switch K;
the leakage protection circuit mainly comprises a conditioning circuit and a single chip microcomputer MCU, and a leakage current signal I obtained from a detection winding LDLDThe input conditioning circuit is input into the MCU port GP after full wave rectification and amplification0After analog-to-digital conversion, the data is compared with a reference value stored in the MCU, and if the data is larger than the reference value, the data is transmitted from the port GP2Silicon controlled Q for outputting high level to tripping protective circuit2Trigger pole to make it conductive, tripping electromagnet TQ1The action is that the switch K is opened, and the power supply load side is cut off;
the self-checking circuit mainly comprises a residual current transformer ZCT, a conditioning circuit, a singlechip MCU and a self-checking drive current Izj generating circuit, wherein when self-checking is needed, the MCU drives a port GP through self-checking1Optical coupler OC of generating circuit for outputting high level to self-test driving current Izj1Make it conductive, self-checking drive current Izj generated by exciting winding ZJ passes through No. 2 rectifier bridge ZQ2The positive terminal of the resistor outputs a full-wave direct-current signal through a resistor R1Current-limiting and voltage-stabilizing tube DW2Voltage stabilizing triode Q1Conducting and passing the full-wave DC signal through a resistor R3And a triode Q1To ground to the 2 nd rectifier bridge ZQ2The AC side and the exciting winding Zj provide a self-checking driving current Izj with a certain value and 50Hz power frequency, the detection winding LD senses the self-checking driving current signal, and the self-checking driving current signal is amplified through full-wave rectification of a conditioning circuit and input into the MCU port GP0Comparing the internal analog-to-digital conversion of MCU with reference value of self-test drive current signal stored in MCU to obtain GP signal3The port outputs high level or low level to the alarm device, and the on and off states of the light emitting diode of the alarm device indicate whether the detected circuit works normally or not.
The MCU of the single chip microcomputer adopts a DIC12F615 processor. MCU output port GP of the singlechip4One end of the T button is connected with the test switch button, and the other end of the T button is grounded. And the self-checking period of the self-checking circuit is set to be about 1 second. The alarm device is composed of a current-limiting resistor R5And Light Emitting Diode (LED)1Formed by connecting in series, when MCU output port GP3LED outputting high level for 1 second and low level for 3 seconds1The self-checking circuit works normally when the MCU is on for 1 second and off for 3 seconds, and when the MCU output end GP3LED outputting only high level, light emitting diode1Long bright indicating the detected circuit is not working properly.
Compared with the prior art, the invention has the following remarkable effects:
(1) the residual current protector is provided with a self-checking circuit, and can detect whether a residual current signal detection circuit, an electric leakage protection circuit and a tripping protection circuit of the residual current protector are in a normal working state in real time so as to ensure the working reliability of the residual current protector; greatly improving the protection to the personal safety.
(2) The conditioning circuit of the residual current protector is used for obtaining a leakage current signal I from a detection winding LD of a residual current transformer ZCTLDOr the self-test driving current signal Izj is converted into a full-wave direct current signal to be provided for the MCU to carry out analog-to-digital conversion and comparison processing, so that a half-wave of a current signal is not lost under the condition that the detection circuit is required to instantaneously act, and the instantaneous action effect of the detection circuit is improved.
Drawings
Fig. 1 is a schematic circuit diagram of a residual current protector with a self-checking function according to an embodiment of the present invention.
Detailed Description
The invention is illustrated in further detail by the following examples.
Referring to fig. 1, a residual current protector with a self-checking function includes a dc working power supply circuit, a residual current signal detection circuit, a trip protection circuit, a leakage protection circuit, and a self-checking circuit.
The direct current working power supply circuit is composed of a phase line L at the side of a power supply load1And zero line N1Two ends get electricity through the 1 st rectifier bridge ZQ1Rectification and resistance R4Capacitor C1Filter and voltage-stabilizing diode DW1The regulated output DC5V is used as the direct current working power supply of the single chip microcomputer MCU2 and the conditioning circuit 1.
The residual current signal detection circuit consists of a residual current transformer ZCT, a detection winding LD thereof and an excitation winding ZJ for self-detecting signals; when the residual current passes through the residual current transformer ZCT, a leakage current signal I is induced in the detection winding LDLD。
The tripping protection circuit mainly comprises a 1 st rectifier bridge ZQ1Silicon controlled rectifier Q2Trip electromagnet TQ1And a switch K; tripping electromagnet TQ1Is connected in series with a 1 st rectifier bridge ZQ1When the action value of the generated electric leakage is larger than the set value, the MCU2 drives the port GP2Output high level to thyristor Q2Trigger pole to make it conductive, tripping electromagnet TQ1The coil is electrified to act, and the switch K is pulled open, so that the load side of the power supply line is powered off, and the tripping protection effect is achieved.
The leakage protection circuit mainly comprises a conditioning circuit1 and a single-chip microcomputer MCU2, and a leakage current signal I obtained from the detection winding LDLDThe input conditioning circuit 1 is input into the port GP of the MCU2 after full-wave rectification and amplification0After analog-to-digital conversion, the data is compared with a reference value stored in the MCU2, and if the data is larger than the reference value, the data is transmitted from the port GP2Silicon controlled Q for outputting high level to tripping protective circuit2Trigger pole to make it conductive, tripping electromagnet TQ1And (3) actuating, opening the switch K, and cutting off the power supply load side to realize the residual current overload trip protection.
The self-checking circuit mainly comprises a residual current transformer ZCT, a conditioning circuit 1, a singlechip MCU2 and a self-checking drive current Izj generating circuit, and when self-checking is needed, the MCU2 drives a port GP through self-checking1Optical coupler OC of generating circuit for outputting high level to self-test driving current Izj1Make it conductive, self-checking drive current Izj generated by exciting winding ZJ passes through No. 2 rectifier bridge ZQ2The positive terminal of the resistor outputs a full-wave direct-current signal through a resistor R1Current-limiting and voltage-stabilizing tube DW2Voltage stabilizing triode Q1Conducting and passing the full-wave DC signal through a resistor R3And a triode Q1To ground to the 2 nd rectifier bridge ZQ2The alternating current side and the excitation winding Zj provide a self-test driving current Izj with a certain value and 50Hz power frequency, the detection winding LD induces the self-test driving current signal, and the self-test driving current signal is amplified through full-wave rectification of the conditioning circuit 1 and input into a port GP of the MCU20From GP by comparing MCU2 internal analog to digital conversion with reference value of self-test drive current signal stored in MCU23The port outputs high level or low level to the alarm device 3, and the on and off states of the light emitting diode of the alarm device 3 indicate whether the detected circuit works normally or not.
The MCU2 single chip microcomputer adopts a DIC12F615 processor. The output port GP of the MCU2 of the singlechip4One end of the T button is connected with the test switch button, and the other end of the T button is grounded. When the T button is pressed, the output port GP of the MCU2 of the singlechip is4The level of the port is pulled down, and GP is enabled by the execution program in the MCU2 of the single chip microcomputer2Controlled silicon Q triggered by high level output from port2Is turned on so that the reverse diode D is provided1Protected electromagnet TQ1Is electrifiedAnd pulling a switch K on the load side of the power supply circuit to cut off the power of the load and the protector, so as to achieve the aim of checking the actuating mechanism, and generally requiring to be pressed once per month to ensure the normal operation of the actuating mechanism. And the self-checking period of the self-checking circuit is set to be about 1 second. The alarm device 3 is composed of a current-limiting resistor R5And Light Emitting Diode (LED)1Formed by connecting in series when MCU2 outputs the port GP3LED outputting high level for 1 second and low level for 3 seconds1The self-checking circuit works normally when the light is on for 1 second and the light is off for 3 seconds, and when the output end GP of the MCU2 is in normal working3LED outputting only high level, light emitting diode1Long bright indicating the detected circuit is not working properly.
Claims (5)
1. The utility model provides a residual current protector with self-checking function which characterized in that: the automatic tripping device comprises a direct-current working power supply circuit, a residual current signal detection circuit, a tripping protection circuit, a leakage protection circuit and a self-checking circuit;
the direct current working power supply circuit is composed of a phase line L at the side of a power supply load1And zero line N1Two ends get electricity through the 1 st rectifier bridge ZQ1Rectification and resistance R4Capacitor C1Filter and voltage-stabilizing diode DW1The voltage-stabilized output DC5V is used as a direct-current working power supply of the single-chip microcomputer MCU (2) and the conditioning circuit (1);
the residual current signal detection circuit consists of a residual current transformer ZCT, a detection winding LD thereof and an excitation winding ZJ for self-detecting signals;
the tripping protection circuit mainly comprises a 1 st rectifier bridge ZQ1Silicon controlled rectifier Q2Trip electromagnet TQ1And a switch K;
the leakage protection circuit mainly comprises a conditioning circuit (1) and a singlechip MCU (2), and a leakage current signal I obtained from a detection winding LDLDThe input conditioning circuit (1) is input into the port GP of the MCU (2) after full-wave rectification and amplification0After analog-to-digital conversion, the data is compared with a reference value stored in the MCU (2), and if the data is larger than the reference value, the data is transmitted from the port GP2Silicon controlled Q for outputting high level to tripping protective circuit2Trigger pole to make it conductive and release electromagnetismIron TQ1The action is that the switch K is opened, and the power supply load side is cut off;
the self-checking circuit mainly comprises a residual current transformer ZCT, a conditioning circuit (1), a singlechip MCU (2) and a self-checking drive current Izj generating circuit, and when self-checking is needed, the MCU (2) drives a port GP through self-checking1Optical coupler OC of generating circuit for outputting high level to self-test driving current Izj1Make it conductive, self-checking drive current Izj generated by exciting winding ZJ passes through No. 2 rectifier bridge ZQ2The positive terminal of the resistor outputs a full-wave direct-current signal through a resistor R1Current-limiting and voltage-stabilizing tube DW2Voltage stabilizing triode Q1Conducting and passing the full-wave DC signal through a resistor R3And a triode Q1To ground to the 2 nd rectifier bridge ZQ2The alternating current side and the excitation winding Zj provide a self-checking driving current Izj with a certain value and 50Hz power frequency, the detection winding LD induces the self-checking driving current signal, and the self-checking driving current signal is amplified through full-wave rectification of the conditioning circuit (1) and input into a port GP of the MCU (2)0Comparing the internal analog-to-digital conversion of the MCU (2) with a reference value of a self-test driving current signal stored in the MCU (2) from GP3The port outputs high level or low level to the alarm device (3), and whether the detected circuit works normally or not is indicated through the bright and the off states of the light emitting diode of the alarm device (3).
2. The residual current protector with the self-checking function according to claim 1, characterized in that the single-chip microcomputer MCU (2) adopts a DIC12F615 processor.
3. Residual current protector with self-checking function according to claim 1, characterized in that said single-chip microcomputer MCU (2) has an output port GP4One end of the T button is connected with the test switch button, and the other end of the T button is grounded.
4. The residual current protector with the self-checking function according to claim 1, wherein a self-checking period of the self-checking circuit is set to about 1 second.
5. Residual current protector with self-checking function according to claim 1, characterized in that said alarm means (3) are constituted by a current limiting resistor R5And Light Emitting Diode (LED)1Formed by connecting in series, when MCU (2) outputs the port GP3LED outputting high level for 1 second and low level for 3 seconds1The self-checking circuit works normally when the light is on for 1 second and the light is off for 3 seconds, and when the output end GP of the MCU (2) is in use3LED outputting only high level, light emitting diode1Long bright indicating the detected circuit is not working properly.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202111086477.2A CN113904300A (en) | 2021-09-16 | 2021-09-16 | Residual current protector with self-checking function |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111086477.2A CN113904300A (en) | 2021-09-16 | 2021-09-16 | Residual current protector with self-checking function |
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| CN113904300A true CN113904300A (en) | 2022-01-07 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115173362A (en) * | 2022-07-12 | 2022-10-11 | 无锡友达电子有限公司 | Leakage protection device with self-checking function |
| CN115453176A (en) * | 2022-11-07 | 2022-12-09 | 南方电网数字电网研究院有限公司 | A sensitivity switchable current mutual induction device and current detection device |
| CN118572622A (en) * | 2024-08-05 | 2024-08-30 | 南通连邦数智信息技术有限公司 | Intelligent power protection device |
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| CN118572622A (en) * | 2024-08-05 | 2024-08-30 | 南通连邦数智信息技术有限公司 | Intelligent power protection device |
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Country or region after: China Address after: Room 1101 and 1102, Building 5, Nanhai Wanyang Innovation City Phase II, No. 82 Xiaotang Industrial Avenue, Shishan Town, Nanhai District, Foshan City, Guangdong Province, China 528200 Applicant after: GUANGDONG FODIAN ELECTRIC APPLIANCE Co.,Ltd. Address before: 528000 2nd floor, building 8, No. 16, Qinggong 3rd road, Chancheng District, Foshan City, Guangdong Province Applicant before: GUANGDONG FODIAN ELECTRIC APPLIANCE Co.,Ltd. Country or region before: China |
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Application publication date: 20220107 |