CN109818332B - Leakage protector with ground wire missing protection - Google Patents
Leakage protector with ground wire missing protection Download PDFInfo
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- CN109818332B CN109818332B CN201910124518.9A CN201910124518A CN109818332B CN 109818332 B CN109818332 B CN 109818332B CN 201910124518 A CN201910124518 A CN 201910124518A CN 109818332 B CN109818332 B CN 109818332B
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- 230000001012 protector Effects 0.000 title claims abstract description 20
- 238000001514 detection method Methods 0.000 claims abstract description 17
- 238000004891 communication Methods 0.000 claims abstract description 9
- 239000003990 capacitor Substances 0.000 claims description 22
- 230000003287 optical effect Effects 0.000 claims description 6
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 5
- 229910052710 silicon Inorganic materials 0.000 description 5
- 239000010703 silicon Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 101100365087 Arabidopsis thaliana SCRA gene Proteins 0.000 description 3
- 101150105073 SCR1 gene Proteins 0.000 description 3
- 101100134054 Saccharomyces cerevisiae (strain ATCC 204508 / S288c) NTG1 gene Proteins 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 206010033799 Paralysis Diseases 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000747 cardiac effect Effects 0.000 description 1
- 230000010485 coping Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
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Abstract
The invention discloses a leakage protector with ground wire missing protection, which relates to the field of leakage protectors, and comprises a tripping module, a zero sequence transformer, a ground wire detection module and a leakage protection chip; the tripping module is used for disconnecting the power supply; the zero sequence transformer is used for detecting whether the zero line and the live line are leaked or not; the leakage protection chip is in communication connection with the zero sequence transformer; when the zero-sequence transformer detects the electric leakage of the zero line and the live line, the leakage protection chip controls the tripping module to disconnect the power supply; the ground wire detection module is used for detecting whether the ground wire is open or not, and is in communication connection with the tripping module; when the ground wire detection module detects that the ground wire is open, the tripping module cuts off the power supply; compared with the prior art, whether the ground wire is in a missing state or not is detected by the ground wire detection module, and the power supply is actively disconnected under the condition that the ground wire is in a missing state or not in an effective grounding state, so that the risk of failure of the transformer and the control chip caused by the ground wire missing is avoided, and the use safety is improved.
Description
Technical Field
The invention relates to the field of leakage protectors, in particular to a leakage protector with ground wire missing protection.
Background
With the improvement of living standard, the popularization rate of the domestic water heater is higher and higher, because the installation or the aging of the electric wires causes the loss or failure of the ground wires, and the safety awareness of users is not high, so that trouble is saved, the ground inserting sheet on the plug of the water heater is sheared off, and the plug of the water heater is inserted into the socket without the ground wire inserting hole;
when the ground wire is lost, the control chip of the leakage protector detects that the mutual inductor which leaks has the risk of failure;
under the condition that the ground wire is absent, when the zero and live wire is in electric leakage, the passive protection condition can occur, namely, the electric leakage protector is disconnected after the human body gets an electric shock for a short period of time, and although a user almost cannot die due to the short electric shock, the user can fall down or cause the cardiac pacemaker to fail due to paralysis of the electric shock, and potential safety hazards still exist;
The leakage protection device with the ground wire live protection disclosed in the China invention CN103178492A comprises three poles of a phase line L, a zero line N and a ground wire E with switches, a zero sequence current transformer passing through the phase line L and the zero line N, a test circuit, a release, a rectifying circuit, a power supply voltage reducing circuit and a silicon controlled rectifier, and is further provided with a current detector and a dual-input-end amplifier, wherein one end of a primary coil of the current detector is connected with the ground wire E, the other end of the primary coil of the current detector is connected with the zero line N after being connected with a large-resistance current limiting voltage reducing circuit in series, a secondary coil of the current detector is connected with one input end of the dual-input-end amplifier, two output ends of the dual-input-end amplifier are respectively connected with trigger electrodes of two silicon controlled rectifiers, and the output end of the zero sequence current transformer is connected with the other input end of the dual-input-end amplifier; although the invention can detect whether the zero line, the live line and the ground line are leaked at the same time, the invention does not have any pre-warning and coping method for the ground line missing.
Disclosure of Invention
1. Technical problem to be solved
Aiming at the defects existing in the prior art, the use safety of the earth leakage protector when the earth wire is lost is improved.
2. Technical proposal
In order to solve the problems, the leakage protector with the ground wire missing protection is particularly provided, and comprises a tripping module, a zero sequence transformer, a ground wire detection module and a leakage protection chip;
The tripping module is used for disconnecting the power supply;
The zero sequence transformer is used for detecting whether the zero line and the live line are leaked or not;
The leakage protection chip is in communication connection with the zero sequence transformer; when the zero-sequence transformer detects the electric leakage of the zero line and the live line, the leakage protection chip controls the tripping module to disconnect the power supply;
the ground wire detection module is used for detecting whether the ground wire is open or not, and is in communication connection with the tripping module;
When the ground wire detection module detects that the ground wire is open, the tripping module cuts off the power supply;
The ground wire detection module comprises a first capacitor, a second capacitor and an optical coupler, wherein one end of the first capacitor is electrically connected with a first input pin of the optical coupler and one end of the second capacitor respectively, the other end of the first capacitor is electrically connected with a live wire, the other end of the second capacitor is electrically connected with a zero line, and a second input pin of the optical coupler is electrically connected with a ground wire; when the ground line is open, the optocoupler is turned off.
The tripping module is also used for disconnecting the ground wire.
The leakage protector further comprises a ground wire transformer;
the ground wire mutual inductor is used for detecting whether the ground wire is leaked or not;
When the ground wire transformer detects ground wire leakage, the leakage protection chip controls the tripping module to disconnect the power supply.
The tripping module comprises a tripping coil, a switch and an active switching element, the leakage protection chip controls whether the tripping coil is electrified or not through the active switching element, and the switch cuts off a power supply when the tripping coil is electrified.
Wherein the active switching element is a silicon controlled rectifier.
The first capacitor and the second capacitor are safety capacitors.
3. The beneficial effects of the invention are that
Compared with the prior art, the invention detects whether the ground wire is in a missing state or not in an effective grounding state through the ground wire detection module, and actively cuts off the power supply under the condition that the ground wire is in a missing state or not in an effective grounding state, thereby avoiding the risk of failure of the transformer and the control chip caused by the missing ground wire, avoiding the risk possibly caused by the passive protection of the common leakage protector and improving the use safety.
Drawings
FIG. 1 is a block diagram of embodiment 1 of the present invention;
FIG. 2 is a schematic diagram of embodiment 1 of the present invention;
FIG. 3 is a schematic diagram of embodiment 2 of the present invention;
fig. 4 is a block diagram of embodiment 3 of the present invention.
Detailed Description
The following describes in further detail the embodiments of the present invention with reference to the drawings and examples. The following examples are illustrative of the invention but are not intended to limit the scope of the invention.
Example 1:
As shown in fig. 1, the leakage protector comprises a tripping module, a zero sequence transformer, a ground wire detection module and a leakage protection chip;
The tripping module is used for disconnecting the power supply;
The zero sequence transformer is used for detecting whether the zero line and the live line are leaked or not;
The leakage protection chip is in communication connection with the zero sequence transformer; when the zero-sequence transformer detects the electric leakage of the zero line and the live line, the leakage protection chip controls the tripping module to disconnect the power supply;
the ground wire detection module is used for detecting whether the ground wire is open or not, and is in communication connection with the tripping module;
when the ground wire detection module detects that the ground wire is open, the tripping module cuts off the power supply.
As shown in fig. 2, when the zero-sequence transformer ZCT1 detects that the zero line N or the live line L leaks electricity, the zero-sequence transformer ZCT1 sends a leakage signal to the leakage protection chip U1, after the leakage protection chip U1 receives the signal, the port 7 of the leakage protection chip U1 outputs a high level, and the thyristor SCR1 is driven to be turned on by the diode D2, so that the trip coil L1 is energized, and then the switch S1 disconnects the zero line N and the live line L.
The safety capacitor C2 and the safety capacitor C3 are connected in series and then connected between the zero line N and the live line L in parallel, the 1 pin of the optocoupler U2 is connected between the safety capacitor C2 and the safety capacitor C3, the 2 pin of the optocoupler U2 is connected with the ground line E through a resistor R12, the 4 pin of the optocoupler U2 is connected with the base electrode of the triode Q1 through a resistor R8, the collector electrode of the triode Q1 is connected with the base electrode of the triode Q2 through a resistor R10, the collector electrode of the triode Q2 is respectively connected with a resistor R6 and a diode D3, and the diode D3 is also electrically connected with the trigger pin of the silicon controlled rectifier SCR 1;
in the case of an effective ground for the ground line E:
when the switch S1 is closed to switch on a power supply, the optocoupler U2 is conducted, the internal resistances of the 3 pin and the 4 pin of the optocoupler U2 are reduced, so that the triode Q1 is conducted, the triode Q2 is also conducted due to the conduction of the triode Q1, the silicon controlled rectifier SCR1 is not conducted, and the circuit can work normally;
in the case where the ground line E is not effectively grounded or the ground line E is missing:
When the switch S1 is turned on and the power is turned on, the ground wire E is missing or not effectively grounded, so the optocoupler U2 is turned off, and the transistor Q1 and the transistor Q2 are turned off, so the thyristor SCR1 is turned on, the trip coil L1 is energized, and the switch S1 is turned off the zero point N and the live wire L.
Whether the ground wire is missing or not is detected by the ground wire detection module, and the power supply is actively disconnected under the condition that the ground wire is missing or not to be effectively grounded, so that the risk of failure of a transformer and a control chip caused by the loss of the ground wire is avoided, the risk possibly caused by the passive protection of a common leakage protector is avoided, and the use safety is improved.
Example 2:
As shown in fig. 3, the switch S1 of the present embodiment also disconnects the ground line E when disconnecting the neutral N and the live line L.
Example 3:
As shown in fig. 4, the embodiment further includes a ground wire transformer, and the leakage protection chip is in communication connection with the ground wire transformer; when the ground wire transformer detects ground wire leakage, the leakage protection chip controls the tripping module to disconnect the power supply.
The above embodiments are only for illustrating the present invention, not for limiting the present invention, and various changes and modifications may be made by one of ordinary skill in the relevant art without departing from the spirit and scope of the present invention, and therefore, all equivalent technical solutions are also within the scope of the present invention, and the scope of the present invention is defined by the claims.
Claims (6)
1. The leakage protector with the ground wire missing protection is characterized by comprising a tripping module, a zero sequence transformer, a ground wire detection module and a leakage protection chip;
The tripping module is used for disconnecting the power supply;
the zero sequence transformer is used for detecting whether the zero line and the live line are leaked or not;
The leakage protection chip is in communication connection with the zero sequence transformer; when the zero sequence transformer detects the leakage of the zero line and the live line, the leakage protection chip controls the tripping module to disconnect the power supply;
The ground wire detection module is used for detecting whether the ground wire is open or not, and is in communication connection with the tripping module;
when the ground wire detection module detects that the ground wire is open, the tripping module cuts off a power supply;
The ground wire detection module comprises a first capacitor, a second capacitor and an optical coupler, wherein one end of the first capacitor is electrically connected with a first input pin of the optical coupler and one end of the second capacitor respectively, the other end of the first capacitor is electrically connected with a live wire, the other end of the second capacitor is electrically connected with a zero line, and a second input pin of the optical coupler is electrically connected with a ground wire; when the ground wire is open, the optocoupler is cut off.
2. The earth leakage protector with ground fault protection of claim 1, wherein the trip module is further configured to disconnect the ground.
3. The earth leakage protector with ground fault protection of claim 1, further comprising a ground transformer;
The ground wire mutual inductor is used for detecting whether the ground wire is leaked or not;
When the ground wire transformer detects ground wire leakage, the leakage protection chip controls the tripping module to disconnect a power supply.
4. The leakage protector with ground fault protection as claimed in claim 1, wherein said trip module comprises a trip coil, a switch and an active switching element, said leakage protection chip controlling whether said trip coil is energized via said active switching element, said switch disconnecting power when said trip coil is energized.
5. The earth leakage protector with ground fault protection as defined in claim 4, wherein said active switching element is a thyristor.
6. The earth leakage protector with ground fault protection as defined in claim 1, wherein said first capacitor and said second capacitor are safety capacitors.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910124518.9A CN109818332B (en) | 2019-02-19 | 2019-02-19 | Leakage protector with ground wire missing protection |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910124518.9A CN109818332B (en) | 2019-02-19 | 2019-02-19 | Leakage protector with ground wire missing protection |
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| Publication Number | Publication Date |
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| CN109818332A CN109818332A (en) | 2019-05-28 |
| CN109818332B true CN109818332B (en) | 2024-04-30 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201910124518.9A Active CN109818332B (en) | 2019-02-19 | 2019-02-19 | Leakage protector with ground wire missing protection |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112162214B (en) * | 2020-08-26 | 2024-05-03 | 浙江朗威微系统有限公司 | Periodic test device and method for leakage detection circuit |
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| WO2013013415A1 (en) * | 2011-07-28 | 2013-01-31 | 深圳市良辉科技有限公司 | Ground wire safe voltage control system |
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2019
- 2019-02-19 CN CN201910124518.9A patent/CN109818332B/en active Active
Patent Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201199583Y (en) * | 2007-08-29 | 2009-02-25 | 钱加灿 | All-purpose safety plug capable of preventing earth wire contact from non-conducting |
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| CN109818332A (en) | 2019-05-28 |
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