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 PDFInfo
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- 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
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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
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.
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 |
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| Publication Number | Publication Date |
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| CN104300492A true CN104300492A (en) | 2015-01-21 |
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| 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 |
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| Country | Link |
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| CN (1) | CN104300492A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 |
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| CN103022970A (en) * | 2011-09-23 | 2013-04-03 | 钱加灿 | High-sensitivity earth wire voltage protection device |
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| 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 |
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 |
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Cited By (4)
| 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 |
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Application publication date: 20150121 |