CN109546618B - Leakage protection circuit with power-on automatic reset and power-off automatic trip functions - Google Patents
Leakage protection circuit with power-on automatic reset and power-off automatic trip functions Download PDFInfo
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- CN109546618B CN109546618B CN201811590259.0A CN201811590259A CN109546618B CN 109546618 B CN109546618 B CN 109546618B CN 201811590259 A CN201811590259 A CN 201811590259A CN 109546618 B CN109546618 B CN 109546618B
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- leakage protection
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- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 15
- 229910052710 silicon Inorganic materials 0.000 claims description 15
- 239000010703 silicon Substances 0.000 claims description 15
- 230000005611 electricity Effects 0.000 claims description 5
- 230000008859 change Effects 0.000 claims description 4
- 230000009467 reduction Effects 0.000 claims description 3
- 239000003990 capacitor Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000001012 protector Effects 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000003139 buffering effect Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
Classifications
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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
- 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
-
- 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
- H02H3/02—Details
- H02H3/06—Details with automatic reconnection
- H02H3/066—Reconnection being a consequence of eliminating the fault which caused disconnection
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Abstract
The invention relates to the technical field of leakage protection, in particular to a leakage protection circuit with the functions of automatic power-on reset and automatic power-off tripping, which comprises a power end and a load end, wherein the power end is used for being connected with a power supply, the load end is used for being connected with a load, and the power end is connected with the load end through a switch contact controlled by a tripping module; the tripping module is connected with the power supply end through the rectifying module; when the power supply end is normally electrified, the tripping module is electrified to drive the switch contact to be closed and conducted, and at the moment, the load can normally acquire electric energy from the power supply; when the power supply end fails and loses power, the tripping module also loses power, the tripping module releases the switch contact, the switch contact is disconnected under the self elasticity, and at the moment, the load cannot acquire electric energy from the power supply; after the fault of the power supply end is repaired, the tripping module can acquire electric energy through the rectifying module again, the switch contact is driven to be closed and conducted again, and at the moment, the load can acquire electric energy from the power supply normally, so that the safety of a user is further ensured.
Description
Technical Field
The invention relates to the technical field of leakage protection, in particular to a leakage protection circuit with a power-on automatic reset and power-off automatic trip function.
Background
In the traditional leakage protection device, such as a leakage protection plug of a household electric water heater, when the electric water heater is normally electrified, as no current passes through a tripping coil, the tripping coil cannot adsorb an armature, and a movable contact of the power supply keep in a contact conduction state; when the leakage fault occurs, the tripping coil adsorbs the armature through current, so that the moving contact and the fixed contact of the power supply are separated, and the power supply of the load is disconnected. However, during normal operation of the electrical appliance, if a power failure occurs, such as disconnection of a zero line and conduction of a live wire, if a load has a leakage failure, the leakage protection device cannot trip to cut off the power supply due to no normal power supply, so that the electrical appliance still has an electric shock hazard, has a huge potential safety hazard, needs to manually cut off the power supply of the electrical appliance, and can be used after the power supply of the electrical appliance is manually turned on after the power failure is repaired; some leakage protectors can cut off the power supply of the electric appliance when the power is cut off, but a plurality of coils are needed to be arranged in the leakage protectors, and the leakage protectors have a complex structure.
Disclosure of Invention
Based on the above, it is necessary to provide a leakage protection circuit with functions of automatic power-on reset and automatic power-off trip to improve the safety and convenience of use of the electrical appliance.
The leakage protection circuit with the functions of automatic power-on reset and automatic power-off tripping comprises a power end and a load end, wherein the power end is used for being connected with a power supply, the load end is used for being connected with a load, and the power end is connected with the load end through a switch contact controlled by a tripping module; the tripping module is connected with the power supply end through the rectifying module; when the power supply end is normally electrified, the tripping module is electrified to drive the switch contact to be closed and conducted; when the power supply end fails and loses power, the tripping module loses power to release the switch contact, and the switch contact is disconnected;
the tripping module comprises a tripping coil and a controllable switching device, wherein two ends of the tripping coil are connected with the rectifying module, and the controllable switching device is connected in parallel with two ends of the tripping coil; the load end is connected with a leakage protection module which is connected with the control end of the controllable switch device; when the leakage protection module detects a load leakage fault, the controllable switching device is triggered to be turned on from off, short circuit is caused to the tripping module, the tripping module loses electricity to release the switching contact, and the switching contact is opened.
In one embodiment, the rectification module is a full-wave rectification circuit.
In one embodiment, the rectifying module is a bridge rectifying circuit, an alternating current input end of the bridge rectifying circuit is connected with the power supply end, and an anode output end and a cathode output end of the bridge rectifying circuit are respectively connected with two ends of the tripping coil;
the controllable switch device is a silicon controlled rectifier, the anode of the silicon controlled rectifier is connected with the positive output end of the bridge rectifier circuit, and the cathode of the silicon controlled rectifier is connected with the negative output end of the bridge rectifier circuit.
In one embodiment, the power supply end is connected with a bridge rectifier circuit through a voltage reduction module, and a diode and a reset key are connected in series between alternating current input ends of the bridge rectifier circuit; the anode of the diode is connected with the zero line of the alternating current input end, the cathode of the diode is connected with the live wire of the alternating current input end, and the alternating current input ends of the bridge rectifier circuit are conducted in a unidirectional mode when a reset key is pressed to form a half-wave rectifier circuit, so that the anode voltage of the silicon controlled rectifier is enabled to pass zero, and the cut-off state is recovered.
In one embodiment, the leakage protection module comprises a leakage protection control chip and a zero sequence current transformer connected with the leakage protection control chip, and a power line of a load end passes through the zero sequence current transformer; the leakage protection control chip is connected with the control end of the controllable switching device; the leakage protection control chip detects the leakage state of the load through the zero sequence current transformer, and triggers the controllable switching device to change from the off state to the on state through the control end during leakage.
In one embodiment, the zero sequence current transformer is connected with a test key for testing whether the zero sequence current transformer works normally.
Compared with the prior art, the leakage protection circuit with the functions of power-on automatic reset and power-off automatic release not only can disconnect the passage between the load and the power supply when the leakage fault occurs, but also can automatically disconnect the passage between the power supply and the load when the power supply fails, and the passage between the power supply and the load can be automatically closed and conducted when the power supply fault is repaired, so that the electric shock danger of a person, which is possibly caused when the live wire is still normally electrified due to disconnection of the zero line of the power supply caused by poor touch, damage and other reasons, is avoided, and the safety of a user is further ensured.
Drawings
FIG. 1 is a schematic diagram of a circuit connection according to an embodiment of the present invention;
FIG. 2 is a schematic diagram illustrating the connection of a trip coil to a switch contact according to one embodiment of the present invention;
fig. 3 is a schematic diagram illustrating connection of a trip coil and a switch contact according to an embodiment of the present invention.
Detailed Description
Further description is provided below in connection with fig. 1-3:
the leakage protection circuit with the functions of automatic power-on reset and automatic power-off tripping comprises a power end 1 and a load end 2, wherein the power end 1 is used for being connected with a power supply, the load end 2 is used for being connected with a load, and the power end 1 is connected with the load end 2 through a switch contact K controlled by a tripping module 3; the tripping module 3 is connected with the power supply end 1 through the rectifying module 4; when the power supply end 1 is normally electrified, the tripping module 3 is electrified, the driving switch contact K is closed and conducted, and at the moment, the load can normally acquire electric energy from the power supply; when the power supply end 1 fails and loses power, the tripping module 3 releases the switch contact K, the switch contact is disconnected under the self elasticity K, and at the moment, the load cannot acquire electric energy from the power supply; after the fault of the power supply end 1 is repaired, the tripping module 3 can acquire electric energy through the rectifying module 4 again, the switch contact K is driven to be closed and conducted again, and at the moment, the load can acquire electric energy from the power supply normally.
The tripping module 3 comprises a tripping coil L1 and controllable switching devices, wherein two ends of the tripping coil L1 are connected with the rectifying module 4, and the controllable switching devices are connected in parallel with two ends of the tripping coil L1; the load end 2 is connected with a leakage protection module 5, and the leakage protection module 5 is connected with the control end of the controllable switching device; when the leakage protection module 5 detects a load leakage fault, the trigger controllable switching device is changed from cut-off to conduction, short circuit is caused to the tripping module 3, the tripping module 3 loses electricity to release the switching contact K, and the switching contact K is opened.
In this scheme, not only can break the passageway between load and the power when having the electric leakage trouble to when the power breaks down, the passageway between power and the load also can be automatic disconnection, and the passageway between power and the load can be automatic closed switch-on when the power trouble is restoreed, avoids the zero line of power to break off because of touching bad, damage etc. and the live wire still normally electric shock danger that can lead to when the live wire still normally circular telegram, has further ensured user's safety.
Specifically, the switch contact K controlled by the trip module 3 may have various embodiments, for example, an armature 7 may be disposed in the trip coil L1 of the trip module 3, one end of the armature 7 is disposed in the trip coil L1, the other end is connected to the switch contact K through a transmission top member 8, and the switch contact K is in an open state under the action of self elastic force, as shown in fig. 3; when the trip coil L1 is energized, the trip coil L1 attracts the armature, which drives the switch contact K to become closed against the elastic force, as shown in fig. 2.
In one embodiment, the rectifying module 4 is a full-wave rectifying circuit; the utilization efficiency of electric energy can be improved, and larger voltage and current can be obtained after rectification.
In one embodiment, the rectifying module 4 is a bridge rectifying circuit composed of a first diode D1, a second diode D2, a third diode D3 and a third diode D4, an ac input end of the bridge rectifying circuit is connected to the power supply end 1, and an anode output end and a cathode output end of the bridge rectifying circuit are respectively connected to two ends of the trip coil L1;
specifically, the junction between the first diode D1 and the fourth diode D4 is used as a first ac input end of the bridge rectifier circuit, the junction between the second diode D2 and the third diode D3 is used as a second ac input end of the bridge rectifier circuit, and the first ac input end and the live wire L of the power supply end 1 Power supply A zero line N connected with the second alternating current input end and the power end 1 Power supply And (5) connection.
The controllable switch device is a silicon controlled rectifier SCR, the anode of the silicon controlled rectifier SCR is connected with the positive output end of the bridge rectifier circuit, the cathode of the silicon controlled rectifier SCR is connected with the negative output end of the bridge rectifier circuit, when the leakage protection module 5 detects that a load has a leakage fault, the control end of the silicon controlled rectifier SCR triggers the silicon controlled rectifier SCR to be turned on from off, short circuit is caused to the tripping module 3, the tripping module 3 loses electricity to release the switch contact K, and the switch contact K is disconnected.
Optionally, a second capacitor C2 is connected in parallel between the anode and the cathode of the SCR, so that damage caused by too fast voltage and current changes at two ends of the SCR can be avoided when the state of the SCR is changed; a second resistor R2 is connected in series between the anode of the bridge rectifier circuit and the anode of the silicon controlled rectifier SCR to realize the function of reducing voltage and buffering; a third capacitor C3 is connected in parallel between the control end of the SCR and the cathode of the SCR, so that the SCR is prevented from being damaged when the voltage and the current of the control end are increased suddenly, and the buffering effect is realized.
In one embodiment, the power supply terminal 1 is connected with a bridge rectifier circuit through a voltage reduction module 6, and a diode D5 and a reset key SW1 are connected in series between alternating current input ends of the bridge rectifier circuit; the anode of the diode D5 is connected with the zero line of the ac input end, the cathode of the diode D5 is connected with the live line of the ac input end, when the reset key SW1 is pressed, the ac input ends of the bridge rectifier circuit are in unidirectional conduction, and the bridge rectifier circuit becomes a half-wave rectifier circuit, so that the anode voltage of the silicon controlled rectifier SCR crosses zero, the off state is recovered, the tripping coil L1 is electrified again, the switch contact K is driven to be closed and conducted again, and at the moment, the load can normally acquire electric energy from the power supply.
Alternatively, the buck module 6 may include a first resistor R1 and a first capacitor C1 connected in series, where one end of the first resistor R1 is connected to the live line L of the power supply terminal 1 Power supply The other end of the first capacitor C1 is connected with the alternating current input end of the bridge rectifier circuit; the step-down module 6 can realize the buffer function and prevent the damage of the internal diode caused by overlarge voltage and current obtained by the bridge rectifier circuit.
In one embodiment, the leakage protection module 5 comprises a leakage protection control chip IC and a zero sequence current transformer ZCT connected with the leakage protection control chip IC, and a power line of the load end 2 passes through the zero sequence current transformer ZCT; the leakage protection control chip IC is connected with the control end of the controllable switching device; the leakage protection control chip IC detects the leakage state of the load through the zero sequence current transformer ZCT, and the leakage protection control chip IC triggers the controllable switching device to change from the cut-off state to the on state through the control end during leakage.
Alternatively, the commonly used leakage protection control chip IC includes a 54123 series chip, a 4145 series chip, a 4146 series chip, and the like; the leakage protection control chip IC can be connected with the rectifying module 4 through the third resistor R3 to take electricity.
In one embodiment, the zero sequence current transformer ZCT is connected with a test key SW2 for testing whether the zero sequence current transformer ZCT works normally or not; when the test key SW2 is pressed, the zero sequence current transformer ZCT can detect that the current change occurs inside, so that the action cuts off the passage between the load and the power supply; if the path between the load and the power supply is not cut off after the test key SW2 is pressed, it indicates that the zero sequence current transformer ZCT may malfunction, and the user should repair or replace parts to ensure safety.
Alternatively, one end of the test key SW2Live line L passing through fourth resistor R4 and load end 2 Load(s) Is connected with a zero line N of a load end 2 after the other end is wound with a zero sequence current transformer ZCT to realize buffer effect Load(s) And (5) connection.
Claims (3)
1. The utility model provides a take electric leakage protection circuit of power on automatic re-setting, outage automatic trip function which characterized in that: the power supply comprises a power supply end (1) used for being connected with a power supply and a load end (2) used for being connected with a load, wherein the power supply end (1) is connected with the load end (2) through a switch contact (K) controlled by a tripping module (3); the tripping module (3) is connected with the power supply end (1) through the rectifying module (4); when the power supply end (1) is normally electrified, the tripping module (3) is electrified, and the driving switch contact (K) is closed and conducted; when the power supply end (1) fails and loses power, the tripping module (3) loses power to release the switch contact (K), and the switch contact (K) is disconnected;
the tripping module (3) comprises a tripping coil (L1) and controllable switching devices, wherein two ends of the tripping coil (L1) are connected with the rectifying module (4), and the controllable switching devices are connected in parallel with two ends of the tripping coil (L1); the load end (2) is connected with a leakage protection module (5), and the leakage protection module (5) is connected with the control end of the controllable switching device; when the leakage protection module (5) detects a load leakage fault, triggering the controllable switching device to be switched from off to on, shorting the tripping module (3), releasing the switching contact (K) when the tripping module (3) loses electricity, and switching the switching contact (K) off;
the rectification module (4) is a full-wave rectification circuit; or the rectifying module (4) is a bridge rectifying circuit, the alternating current input end of the bridge rectifying circuit is connected with the power end (1), and the positive electrode output end and the negative electrode output end of the bridge rectifying circuit are respectively connected with the two ends of the tripping coil (L1); the controllable switch device is a Silicon Controlled Rectifier (SCR), the anode of the Silicon Controlled Rectifier (SCR) is connected with the positive output end of the bridge rectifier circuit, and the cathode of the Silicon Controlled Rectifier (SCR) is connected with the negative output end of the bridge rectifier circuit;
the leakage protection module (5) comprises a leakage protection control chip (IC) and a zero sequence current transformer (ZCT) connected with the leakage protection control chip, and a power line of the load end (2) passes through the zero sequence current transformer (ZCT); the leakage protection control chip (IC) is connected with the control end of the controllable switching device; the leakage protection control chip (IC) detects the leakage state of the load through a zero sequence current transformer (ZCT), and triggers the controllable switching device to change from the cut-off state to the conduction state through the control end during leakage.
2. The leakage protection circuit with a power-on automatic reset and power-off automatic trip function according to claim 1, wherein: the power end (1) is connected with a bridge rectifier circuit through a voltage reduction module (6), and a diode (D5) and a reset key (SW 1) are connected in series between alternating current input ends of the bridge rectifier circuit; the anode of the diode (D5) is connected with a zero line of the alternating current input end, the cathode of the diode (D5) is connected with a live wire of the alternating current input end, and the alternating current input ends of the bridge rectifier circuit are conducted in a unidirectional mode when a reset key (SW 1) is pressed to form a half-wave rectifier circuit, so that the anode voltage of the Silicon Controlled Rectifier (SCR) crosses zero, and the cut-off state is recovered.
3. The leakage protection circuit with a power-on automatic reset and power-off automatic trip function according to claim 1, wherein: the zero sequence current transformer (ZCT) is connected with a test key (SW 2) for testing whether the zero sequence current transformer (ZCT) works normally.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811590259.0A CN109546618B (en) | 2018-12-25 | 2018-12-25 | Leakage protection circuit with power-on automatic reset and power-off automatic trip functions |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811590259.0A CN109546618B (en) | 2018-12-25 | 2018-12-25 | Leakage protection circuit with power-on automatic reset and power-off automatic trip functions |
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| Publication Number | Publication Date |
|---|---|
| CN109546618A CN109546618A (en) | 2019-03-29 |
| CN109546618B true CN109546618B (en) | 2024-02-02 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201811590259.0A Active CN109546618B (en) | 2018-12-25 | 2018-12-25 | Leakage protection circuit with power-on automatic reset and power-off automatic trip functions |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111082389B (en) * | 2020-01-06 | 2025-03-25 | 苏州益而益电器制造有限公司 | Leakage protection device with reset control function |
| CN112383023A (en) * | 2020-11-02 | 2021-02-19 | 佛山市顺德区信辉达电子有限公司 | Intelligent leakage protector with high-voltage test |
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| CN200976338Y (en) * | 2006-12-01 | 2007-11-14 | 陈贵 | GFCI having full fault indication and forced release function |
| CN102457042A (en) * | 2010-10-26 | 2012-05-16 | 黄华道 | Novel electricity leakage detection protection circuit |
| CN105958439A (en) * | 2016-05-30 | 2016-09-21 | 深圳市良辉科技有限公司 | Leakage protection device having ground wire live-line indication function |
| CN107658646A (en) * | 2016-07-24 | 2018-02-02 | 郭振华 | A kind of multifunctional safe intelligent switch socket |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013020274A1 (en) * | 2011-08-09 | 2013-02-14 | 深圳市良辉科技有限公司 | Safe quick-break leakage protector |
| KR101247208B1 (en) * | 2012-08-07 | 2013-03-26 | 엠티엔시 (주) | Earth leakage breaker |
-
2018
- 2018-12-25 CN CN201811590259.0A patent/CN109546618B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN200976338Y (en) * | 2006-12-01 | 2007-11-14 | 陈贵 | GFCI having full fault indication and forced release function |
| CN102457042A (en) * | 2010-10-26 | 2012-05-16 | 黄华道 | Novel electricity leakage detection protection circuit |
| CN105958439A (en) * | 2016-05-30 | 2016-09-21 | 深圳市良辉科技有限公司 | Leakage protection device having ground wire live-line indication function |
| CN107658646A (en) * | 2016-07-24 | 2018-02-02 | 郭振华 | A kind of multifunctional safe intelligent switch socket |
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| CN109546618A (en) | 2019-03-29 |
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