CN104300492A - Electric leakage protection plug with ground wire high voltage detection function - Google Patents

Electric leakage protection plug with ground wire high voltage detection function Download PDF

Info

Publication number
CN104300492A
CN104300492A CN201410521650.0A CN201410521650A CN104300492A CN 104300492 A CN104300492 A CN 104300492A CN 201410521650 A CN201410521650 A CN 201410521650A CN 104300492 A CN104300492 A CN 104300492A
Authority
CN
China
Prior art keywords
ground wire
circuit
high voltage
current
zero
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201410521650.0A
Other languages
Chinese (zh)
Inventor
钱加灿
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Yuyao Jiarong Electronic Appliance Co Ltd
Original Assignee
Yuyao Jiarong Electronic Appliance Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Yuyao Jiarong Electronic Appliance Co Ltd filed Critical Yuyao Jiarong Electronic Appliance Co Ltd
Priority to CN201410521650.0A priority Critical patent/CN104300492A/en
Publication of CN104300492A publication Critical patent/CN104300492A/en
Pending legal-status Critical Current

Links

Landscapes

  • Emergency Protection Circuit Devices (AREA)

Abstract

The invention discloses an electric leakage protection plug with the ground wire high voltage detection function. The electric leakage protection plug with the ground wire high voltage detection function comprises a release, a rectifying circuit, a power supply voltage reduction circuit, a first amplification circuit and a thyristor, wherein one end of the rectifying circuit is connected with the release, the other end of the rectifying circuit is connected with the power supply voltage reduction circuit and the thyristor, the first amplification circuit is connected with the power supply voltage reduction circuit and the thyristor, a ground wire high voltage detection unit is arranged between the first amplification circuit and a ground wire and comprises a voltage transformer, a regulating resistor and a current-limiting resistor, one end of a primary coil of a zero-sequence transformer is connected with the current-limiting resistor, the other end of the primary coil of the zero-sequence transformer is connected with the ground wire at the output end, the regulating resistor is connected to the two ends of the primary coil of the zero-sequence transformer, and the current-limiting resistor is connected with a wall. According to the electric leakage protection plug with the ground wire high voltage detection function, the defect that in the prior art, the ground wire voltage detection and protection functions can not be achieved by an electric leakage protection plug is overcome, when high voltage passes through the ground wire, the thyristor can also be triggered, then the release is triggered to act, a circuit is opened, and the safety of an electric water heater is improved.

Description

With the leakage protecting plug that ground wire high voltage detects
Technical field
The present invention relates to electric heater electric security protector device field, particularly a kind of leakage protecting plug detected with ground wire high voltage.
Background technology
The leakage protecting plug of prior art can detect the situation of ground strip electric current; but in real life; ground wire may be with high voltage; and the electric current flowing through ground wire is very little; the leakage protecting plug of prior art desirably linear flow overcurrent just can trip; belong to passive tripping operation, therefore, bring no small potential safety hazard to user's life.
Summary of the invention
(1) technical problem that will solve
Object of the present invention will overcome above-mentioned shortcoming exactly, aims to provide a kind of leakage protecting plug detected with ground wire high voltage.
(2) technical scheme
For solving the problem, the present invention proposes a kind of leakage protecting plug detected with ground wire high voltage, comprise release, rectification circuit, power voltage step down circuit, first amplifying circuit and controllable silicon, described rectification circuit one end connects release, the other end connects power voltage step down circuit and controllable silicon, described first amplifying circuit connects power voltage step down circuit and controllable silicon, ground wire high-pressure detection unit is provided with between described first amplifying circuit and ground wire, described ground wire high-pressure detection unit comprises voltage transformer, regulating resistance and current-limiting resistance, one end of the primary coil of described zero-sequence transformer connects current-limiting resistance, the other end connects output ground wire, described regulating resistance is connected to zero-sequence transformer secondary coil two ends, described current-limiting resistance and wall connecting.
Further, be provided with induced voltage between the zero line of this plug and ground wire and eliminate circuit.
Further, ground wire electrification indicating circuit is provided with between the zero line of this plug and ground wire.
Further, described ground wire electrification indicating circuit is neon lamp and the current-limiting resistance of series connection.
Further, also comprise power supply indicator, zero sequence current mutual inductor, the second amplifying circuit, the first reverse isolation circuit, the second reverse isolation circuit and overtemperature to detect, described power supply indicator connects rectification circuit, described zero sequence current mutual inductor is passed by zero line, live wire, its secondary coil connects the second amplifying circuit, described first reverse isolation circuit two ends connect the second amplifying circuit and controllable silicon respectively, described second reverse isolation circuit connects the first amplifying circuit and controllable silicon respectively, and described overtemperature detects and connects controllable silicon and power voltage step down circuit respectively; Described first amplifying circuit is also provided with connected ground line current instrument transformer, and described ground line current instrument transformer is passed by ground wire.
Further, change over switch is provided with between described voltage transformer and ground line current instrument transformer.
(3) beneficial effect
Compared with prior art; the present invention has the following advantages: the leakage protecting plug that instant invention overcomes prior art lacks the effect to ground wire voltage detecting and protection; during local linear flow too high voltages; also controllable silicon can be triggered; the action of further triggering release; cut off circuit, initiatively can trip, improve the fail safe of electric heater.
Accompanying drawing explanation
Fig. 1 is the module map of the leakage protecting plug that band ground wire high voltage of the present invention detects;
Fig. 2 is the circuit theory diagrams of the leakage protecting plug that band ground wire high voltage of the present invention detects;
Fig. 3 is the schematic block circuit diagram of the leakage protecting plug embodiment two that band ground wire high voltage of the present invention detects;
Fig. 4 is the schematic block circuit diagram of the leakage protecting plug embodiment three that band ground wire high voltage of the present invention detects;
Fig. 5 is the schematic block circuit diagram of the leakage protecting plug embodiment four that band ground wire high voltage of the present invention detects.
Embodiment
Below in conjunction with drawings and Examples, the specific embodiment of the present invention is described in further detail.Following examples for illustration of the present invention, but are not used for limiting the scope of the invention.
Embodiment one
Circuit theory diagrams as depicted in figs. 1 and 2, the leakage protecting plug that band ground wire high voltage of the present invention detects, comprise release, rectification circuit, power voltage step down circuit, first amplifying circuit and controllable silicon SCR 1, described rectification circuit one end connects release, the other end connects power voltage step down circuit and controllable silicon SCR 1, described first amplifying circuit connects power voltage step down circuit and controllable silicon SCR 1, wherein, rectification circuit is rectifying tube D1, power voltage step down circuit is R2, first amplifying circuit is earth leakage protective chip IC 1, the control pole of controllable silicon SCR 1 controls by earth leakage protective chip IC 1, ground wire high-pressure detection unit is provided with between described first amplifying circuit and ground wire E, described ground wire high-pressure detection unit comprises zero-sequence transformer ZCT1, regulating resistance R3 and current-limiting resistance R4, one end of the primary coil of described zero-sequence transformer ZCT1 connects current-limiting resistance R4, the other end connects output ground wire E, described regulating resistance R3 is connected to zero-sequence transformer ZCT1 secondary coil two ends, described current-limiting resistance R4 and wall connecting.
Be provided with induced voltage between the zero line N of this plug and ground wire E and eliminate circuit, it is electric capacity C1 that this induced voltage eliminates circuit.
Ground wire electrification indicating circuit is provided with between the zero line N of this plug and ground wire E.
Described ground wire electrification indicating circuit is neon lamp H and the current-limiting resistance R1 of series connection.
When ground strip has high voltage, this voltage provides the signal of telecommunication by zero-sequence transformer ZCT1 to earth leakage protective chip IC 1, thus triggers the control pole of controllable silicon SCR 1, controllable silicon SCR 1 conducting, and therefore, release action, is disconnected circuit.
The leakage protecting plug that instant invention overcomes prior art lacks the effect to ground wire voltage detecting and protection, during local linear flow too high voltages, also can trigger controllable silicon, triggers release action further, cuts off circuit, improves the fail safe of electric heater.
Embodiment two
The design of leakage protecting plug improves by the present embodiment on the basis of embodiment one, as shown in Figure 3, circuit after improvement also comprises power supply indicator, zero sequence current mutual inductor ZCT1, second amplifying circuit, first reverse isolation circuit, second reverse isolation circuit and overtemperature detect, described power supply indicator connects rectification circuit, described zero sequence current mutual inductor ZCT1 is by zero line, live wire passes, its secondary coil connects the second amplifying circuit, described first reverse isolation circuit two ends connect the second amplifying circuit and controllable silicon respectively, described second reverse isolation circuit connects the first amplifying circuit and controllable silicon respectively, described overtemperature detects and connects controllable silicon and power voltage step down circuit respectively, described first amplifying circuit is also provided with connected ground line current instrument transformer ZCT2, and described ground line current instrument transformer ZCT2 is passed by ground wire.
In this circuit, the secondary coil of voltage transformer ZCT3 connects the first amplifying circuit IC1, and its primary coil connects ground terminal and current-limiting resistance R4, current-limiting resistance R4 other end connecting wall.When ground wire E has leakage current; ground line current instrument transformer ZCT2 secondary coil can produce induced voltage; be input to the first amplifying circuit IC1; thus make the first amplifying circuit IC1 trigger controlled silicon conducting; last release action; when this circuit achieves ground wire with high voltage and ground strip leakage current simultaneously, the function of leakage protecting plug open circuit.
Embodiment three
This embodiment is improved on the basis of embodiment two, change over switch K is provided with between described voltage transformer ZCT3 and ground line current instrument transformer ZCT2, thus user can select to adopt any one ground wire detection of electrical leakage mode, as K switch turn-on voltage instrument transformer ZCT3, adopt ground strip high pressure detection mode; When K switch connects ground line current instrument transformer ZCT2, adopt ground strip leakage current detection mode.This circuit overcomes the defect that the complicated old-fashioned leakage protecting plug caused of some user's family ground wire electrification situation can not normally use.Schematic block circuit diagram is shown in Fig. 4.
Embodiment four
The ground line current instrument transformer ZCT2 that embodiment two also can be mentioned by the present embodiment removes, and retains zero sequence current mutual inductor ZCT1, for responding to the drain conditions of zero live wire, and voltage transformer ZCT3, for the situation of inductively tape high pressure.Schematic block circuit diagram is see Fig. 5, and the leakage protecting plug after improvement further reduces the volume of this production cost and product itself under ensure that the prerequisite that this plug normally works.
Below be only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the prerequisite not departing from the technology of the present invention principle; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.

Claims (6)

1. the leakage protecting plug detected with ground wire high voltage, comprise release, rectification circuit, power voltage step down circuit, first amplifying circuit and controllable silicon, described rectification circuit one end connects release, the other end connects power voltage step down circuit and controllable silicon, described first amplifying circuit connects power voltage step down circuit and controllable silicon, it is characterized in that: between described first amplifying circuit and ground wire, be provided with ground wire high-pressure detection unit, described ground wire high-pressure detection unit comprises voltage transformer, regulating resistance and current-limiting resistance, one end of the primary coil of described zero-sequence transformer connects current-limiting resistance, the other end connects output ground wire, described regulating resistance is connected to zero-sequence transformer secondary coil two ends, described current-limiting resistance and wall connecting.
2. the leakage protecting plug of band ground wire high voltage detection according to claim 1, is characterized in that: be provided with induced voltage between the zero line of this plug and ground wire and eliminate circuit.
3. the leakage protecting plug of band ground wire high voltage detection according to claim 2, is characterized in that: be provided with ground wire electrification indicating circuit between the zero line of this plug and ground wire.
4. the leakage protecting plug of band ground wire high voltage detection according to claim 3, is characterized in that: described ground wire electrification indicating circuit is neon lamp and the current-limiting resistance of series connection.
5. the leakage protecting plug of band ground wire high voltage detection according to claim 4, it is characterized in that: also comprise power supply indicator, zero sequence current mutual inductor, second amplifying circuit, first reverse isolation circuit, second reverse isolation circuit and overtemperature detect, described power supply indicator connects rectification circuit, described zero sequence current mutual inductor is by zero line, live wire passes, its secondary coil connects the second amplifying circuit, described first reverse isolation circuit two ends connect the second amplifying circuit and controllable silicon respectively, described second reverse isolation circuit connects the first amplifying circuit and controllable silicon respectively, described overtemperature detects and connects controllable silicon and power voltage step down circuit respectively, described first amplifying circuit is also provided with connected ground line current instrument transformer, and described ground line current instrument transformer is passed by ground wire.
6. the leakage protecting plug of band ground wire high voltage detection according to claim 5, is characterized in that: be provided with change over switch between described voltage transformer and ground line current instrument transformer.
CN201410521650.0A 2014-09-30 2014-09-30 Electric leakage protection plug with ground wire high voltage detection function Pending CN104300492A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201410521650.0A CN104300492A (en) 2014-09-30 2014-09-30 Electric leakage protection plug with ground wire high voltage detection function

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201410521650.0A CN104300492A (en) 2014-09-30 2014-09-30 Electric leakage protection plug with ground wire high voltage detection function

Publications (1)

Publication Number Publication Date
CN104300492A true CN104300492A (en) 2015-01-21

Family

ID=52320124

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201410521650.0A Pending CN104300492A (en) 2014-09-30 2014-09-30 Electric leakage protection plug with ground wire high voltage detection function

Country Status (1)

Country Link
CN (1) CN104300492A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104767173A (en) * 2015-03-20 2015-07-08 余姚市嘉荣电子电器有限公司 IC-free optical-coupler detection ground wire voltage abnormity electricity leakage protection device
CN108011256A (en) * 2016-12-20 2018-05-08 芜湖美的厨卫电器制造有限公司 Leakage protecting plug and electric heater

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN202305642U (en) * 2011-11-09 2012-07-04 艾欧史密斯(中国)热水器有限公司 Ground wire live detecting apparatus
CN103022970A (en) * 2011-09-23 2013-04-03 钱加灿 High-sensitivity earth wire voltage protection device
CN202917763U (en) * 2012-11-27 2013-05-01 钱加灿 Electric leakage detection protection plug
CN103346532A (en) * 2013-07-11 2013-10-09 余姚市嘉荣电子电器有限公司 Electric leakage prevention plug circuit
CN203690888U (en) * 2014-02-20 2014-07-02 余姚市嘉荣电子电器有限公司 Electric leakage protection plug
CN204205558U (en) * 2014-09-30 2015-03-11 余姚市嘉荣电子电器有限公司 With the leakage protecting plug that ground wire high voltage detects

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103022970A (en) * 2011-09-23 2013-04-03 钱加灿 High-sensitivity earth wire voltage protection device
CN202305642U (en) * 2011-11-09 2012-07-04 艾欧史密斯(中国)热水器有限公司 Ground wire live detecting apparatus
CN202917763U (en) * 2012-11-27 2013-05-01 钱加灿 Electric leakage detection protection plug
CN103346532A (en) * 2013-07-11 2013-10-09 余姚市嘉荣电子电器有限公司 Electric leakage prevention plug circuit
CN203690888U (en) * 2014-02-20 2014-07-02 余姚市嘉荣电子电器有限公司 Electric leakage protection plug
CN204205558U (en) * 2014-09-30 2015-03-11 余姚市嘉荣电子电器有限公司 With the leakage protecting plug that ground wire high voltage detects

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104767173A (en) * 2015-03-20 2015-07-08 余姚市嘉荣电子电器有限公司 IC-free optical-coupler detection ground wire voltage abnormity electricity leakage protection device
CN104767173B (en) * 2015-03-20 2017-12-08 余姚市嘉荣电子电器有限公司 Ground wire voltage exception earth leakage protective device is detected without IC optocouplers
CN108011256A (en) * 2016-12-20 2018-05-08 芜湖美的厨卫电器制造有限公司 Leakage protecting plug and electric heater
CN108011256B (en) * 2016-12-20 2023-10-27 芜湖美的厨卫电器制造有限公司 Leakage protection plug and electric water heater

Similar Documents

Publication Publication Date Title
CN103346532B (en) Electric leakage prevention plug circuit
CN104577977A (en) Voltage and current switchable type electric leakage protection device
CN202259980U (en) Plug with ground wire live protection mechanism
CN104009448A (en) Novel leakage protection method and novel leakage protection device with live and neutral wire identification function
CN204967236U (en) Leakage protector
CN104577971A (en) Outage trip protection plug
CN104377647B (en) leakage protection circuit
CN204205558U (en) With the leakage protecting plug that ground wire high voltage detects
CN203536652U (en) Electric leakage protection plug with overtemperature detection
CN104300492A (en) Electric leakage protection plug with ground wire high voltage detection function
CN105490101A (en) Protection plug with power-off tripping and overvoltage tripping functions
CN204131087U (en) Earth leakage protective device
CN102842889B (en) One is tape voltage protection with sensitivity
CN103474955A (en) Earth leakage protection plug
CN203326559U (en) Electric leakage protection plug circuit
CN204992530U (en) Three -phase leakage protection circuit
CN104319559A (en) Leakage protection plug with ground wire live-line indication
CN204205200U (en) There is the leakage protecting plug of ground wire electrification instruction
CN206412749U (en) The control circuit of the earth leakage protective device of the double protections of ground wire
CN103022970B (en) Tape voltage protection with sensitivity
CN203536934U (en) Electric leakage protection plug
CN103490238B (en) Leakage protecting plug
CN202772550U (en) High sensitivity ground wire electriferous protection apparatus
CN204992531U (en) Three -phase four -wire leakage protection circuit
CN104734114B (en) The abnormal earth leakage protective device of optocoupler detection ground wire voltage

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
RJ01 Rejection of invention patent application after publication
RJ01 Rejection of invention patent application after publication

Application publication date: 20150121