CN201555922U - Device on detecting reverse connection of power supply and electrification of ground wire - Google Patents

Device on detecting reverse connection of power supply and electrification of ground wire Download PDF

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Publication number
CN201555922U
CN201555922U CN2009202738382U CN200920273838U CN201555922U CN 201555922 U CN201555922 U CN 201555922U CN 2009202738382 U CN2009202738382 U CN 2009202738382U CN 200920273838 U CN200920273838 U CN 200920273838U CN 201555922 U CN201555922 U CN 201555922U
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CN
China
Prior art keywords
ground wire
microprocessor
power supply
links
electrification
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.)
Expired - Lifetime
Application number
CN2009202738382U
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Chinese (zh)
Inventor
吕汉泉
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.)
HANGZHOU SDIC MICROELETRONICS CO Ltd
Original Assignee
HANGZHOU SDIC MICROELETRONICS 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
Priority to CN200920192625.7 priority Critical
Application filed by HANGZHOU SDIC MICROELETRONICS CO Ltd filed Critical HANGZHOU SDIC MICROELETRONICS CO Ltd
Priority to CN2009202738382U priority patent/CN201555922U/en
Application granted granted Critical
Publication of CN201555922U publication Critical patent/CN201555922U/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Abstract

The utility model relates to a device on detecting reverse connection of a power supply an electrification of a ground wire. The device is characterized by comprising a sampling circuit, a micro processor and a display device, wherein the sampling circuit comprises a zero line sampling end and a ground wire sampling end, wherein the signal output end of the sampling circuit is connected with an analogy-digital convertor, the signal output end of the analogy-digital convertor is connected with a voltage effective value calculating circuit which is respectively connected with the microprocessor and a digital comparator, and the digital comparator is respectively connected with the microprocessor and a threshold value register which is connected with the microprocessor, and a display device is connected with the microprocessor. The detection can directly and accurately displays voltage of power supply which is reversely connected and electrification of the ground wire.

Description

The pick-up unit of a kind of power supply reversal connection and ground wire electrification
Technical field
The utility model relates to a kind of circuit checker, especially relates to the pick-up unit of a kind of power supply reversal connection and ground wire electrification.
Background technology
Present various household electrical appliance are very universal, as electrical equipment such as electric heaters since convenient and practical obtained widely use, but electric heater has the hidden danger of electric leakage in the use, ground wire do not have or the imperfect earth situation under, to produce harm to human body, more common problem has ground wire electrification, power supply phase line L, zero line N reversal connection.People have proposed certain methods and have solved these problems, disclose a kind of electric heater electronics electricity-preventing wall device as the patent No. 200720178140.3 Chinese patents, it comprises that ZCT zero sequence current mutual inductor, mu balanced circuit, leakage current detect integrated circuit, voltage difference pick-up unit, transistor switching circuit, relay circuit; External power source phase line and zero line all pass the power input that the ZCT zero sequence current mutual inductor inserts water heater then in the same way, when the leakage current of water heater power supply appearance is excessive, the output terminal that leakage current detects integrated circuit produces high level signal, drive transistor switching circuit and make light emitting diode light warning, control relay circuit disconnects simultaneously; PE ground wire on the water heater and N line insert the voltage difference pick-up unit by the resistance current limliting, and when potential difference (PD) was excessive between ground wire PE and the zero line N, voltage difference pick-up unit control relay circuit disconnected.The Chinese patent of the patent No. 200620075855.1 discloses a kind of electric heater ground wire electrification warning device; it mainly adopts the heating tube of electric heater to connect temperature controller, overheat protector, live wire, zero line, ground wire; feature is that a selector switch and alarm are set between live wire, zero line and ground wire; alarm one end is connected with ground terminal; the other end is connected with selector switch; the selecting side of selector switch is connected with zero line, and ground wire and zero line have formed a loop by alarm and selector switch.When in a single day the extreme situation of imperfect earth and ground wire electrification appearred in power utilization environment, there was potential safety hazard in alarm prompting user ground wire; If there is the situation of live wire and zero line reversal connection in the subscriber household wiring system, warning device points out the user should rectify and improve being connected of live wire and zero line, thereby guarantees user's bathing safety.But these technical schemes are the size of display voltage intuitively all.Make the user cannot obtain more directly, judge accurately to danger.
Summary of the invention
The utility model mainly is the pick-up unit size of display voltage intuitively that solves existing in prior technology power supply reversal connection and ground wire electrification, make the user to the technical matters that danger cannot obtain more directly, judge accurately, provide a kind of can intuitive and accurate display voltage size the power supply reversal connection and the pick-up unit of ground wire electrification.
Above-mentioned technical matters of the present utility model is mainly solved by following technical proposals: the pick-up unit of a kind of power supply reversal connection and ground wire electrification, it is characterized in that it comprises sample circuit, microprocessor and display device, described sample circuit comprises zero line sampling end and ground wire sampling end, the signal output part of sample circuit links to each other with an analog to digital converter, the signal output part of analog to digital converter links to each other with a voltage effective value counting circuit, the voltage effective value counting circuit links to each other with a digital comparator with described microprocessor respectively, digital comparator links to each other with a threshold register with described microprocessor respectively, threshold register links to each other with described microprocessor, and described display device links to each other with described microprocessor.Voltage difference between zero line N and ground wire PE is sampled through sample circuit, alternating voltage after the sampling is directly given analog to digital converter, the transformation result of analog to digital converter enters the voltage effective value counting circuit, obtain voltage effective value, this value compares with threshold register, this comparison procedure is realized by digital comparator, if voltage effective value is greater than the value in the threshold register, digital comparator can be exported control signal and give microprocessor (MCU), MCU is corresponding to do the indication of reporting to the police, and also can directly output to the outside and do power down process.MCU can read simultaneously the magnitude of voltage of voltage effective value counting circuit, and this value is converted to the size of virtual voltage, shows by display device.
As preferably, described analog to digital converter, the voltage effective value counting circuit, digital comparator, threshold register and microprocessor are gathered on a chip.
As preferably, described display device is the LCD/LED display.The LCD/LED display is lower with kind of cost, intuitive display, the display device of good looking appearance.
As preferably, described sample circuit is provided with voltage transformer (VT) or electric resistance partial pressure device.Voltage transformer (VT) and resitstance voltage divider can
The beneficial effect that brings of the present utility model is the pick-up unit size of display voltage intuitively that has solved reversal connection of existing in prior technology power supply and ground wire electrification, make the user to the technical matters that danger cannot obtain more directly, judge accurately, realized a kind of can intuitive and accurate display voltage size the power supply reversal connection and the pick-up unit of ground wire electrification.
Description of drawings
Accompanying drawing 1 is a kind of structural representation of the present utility model:
Embodiment
Below by embodiment, and in conjunction with the accompanying drawings, the technical solution of the utility model is described in further detail.
Embodiment: as shown in Figure 1, the utility model is the pick-up unit of a kind of power supply reversal connection and ground wire electrification, it comprises sample circuit, microprocessor and LCD/LED display, sample circuit is provided with voltage transformer (VT) or electric resistance partial pressure device, and comprise zero line sampling end and ground wire sampling end, the signal output part of sample circuit links to each other with an analog to digital converter, the signal output part of analog to digital converter links to each other with a voltage effective value counting circuit, the voltage effective value counting circuit links to each other with a digital comparator with described microprocessor respectively, digital comparator links to each other with a threshold register with described microprocessor respectively, threshold register links to each other with described microprocessor, and described LCD/LED display links to each other with described microprocessor.Analog to digital converter, the voltage effective value counting circuit, digital comparator, threshold register and microprocessor are gathered on a chip.
Voltage difference between zero line N and ground wire PE is sampled through sample circuit, alternating voltage after the sampling is directly given analog to digital converter, the transformation result of analog to digital converter enters the voltage effective value counting circuit, obtain voltage effective value, this value compares with threshold register, this comparison procedure is realized by digital comparator, if voltage effective value is greater than the value in the threshold register, digital comparator can be exported control signal and give microprocessor (MCU), MCU is corresponding to do the indication of reporting to the police, and also can directly output to the outside and do power down process.MCU can read simultaneously the magnitude of voltage of voltage effective value counting circuit, and this value is converted to the size of virtual voltage, shows by display device.
So the utlity model has can intuitive and accurate display voltage size, and has features such as easy to operate, safe and reliable.

Claims (5)

1. the pick-up unit of power supply reversal connection and ground wire electrification, it is characterized in that it comprises sample circuit, microprocessor and display device, described sample circuit comprises zero line sampling end and ground wire sampling end, the signal output part of sample circuit links to each other with an analog to digital converter, the signal output part of analog to digital converter links to each other with a voltage effective value counting circuit, the voltage effective value counting circuit links to each other with a digital comparator with described microprocessor respectively, digital comparator links to each other with a threshold register with described microprocessor respectively, threshold register links to each other with described microprocessor, and described display device links to each other with described microprocessor.
2. the pick-up unit of a kind of power supply reversal connection according to claim 1 and ground wire electrification is characterized in that described analog to digital converter, the voltage effective value counting circuit, and digital comparator, threshold register and microprocessor are gathered on a chip.
3. the pick-up unit of a kind of power supply reversal connection according to claim 1 and 2 and ground wire electrification is characterized in that described display device is the LCD/LED display.
4. the pick-up unit of a kind of power supply reversal connection according to claim 1 and 2 and ground wire electrification is characterized in that described sample circuit is provided with voltage transformer (VT) or electric resistance partial pressure device.
5. the pick-up unit of a kind of power supply reversal connection according to claim 3 and ground wire electrification is characterized in that described sample circuit is provided with voltage transformer (VT) or electric resistance partial pressure device.
CN2009202738382U 2009-08-21 2009-11-28 Device on detecting reverse connection of power supply and electrification of ground wire Expired - Lifetime CN201555922U (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN200920192625.7 2009-08-21
CN2009202738382U CN201555922U (en) 2009-08-21 2009-11-28 Device on detecting reverse connection of power supply and electrification of ground wire

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN2009202738382U CN201555922U (en) 2009-08-21 2009-11-28 Device on detecting reverse connection of power supply and electrification of ground wire

Publications (1)

Publication Number Publication Date
CN201555922U true CN201555922U (en) 2010-08-18

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN2009202738382U Expired - Lifetime CN201555922U (en) 2009-08-21 2009-11-28 Device on detecting reverse connection of power supply and electrification of ground wire

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CN (1) CN201555922U (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102655323A (en) * 2012-04-19 2012-09-05 美的集团有限公司 Converting circuit for automatically identifying alternating-current zero line and live lines
CN105445596A (en) * 2014-08-15 2016-03-30 神讯电脑(昆山)有限公司 Battery detection circuit
CN107024628A (en) * 2016-01-20 2017-08-08 德律科技股份有限公司 Test device and its AC power method for detecting
CN110998347A (en) * 2017-07-19 2020-04-10 李铉昌 Apparatus and method for improving leakage probing accuracy

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102655323A (en) * 2012-04-19 2012-09-05 美的集团有限公司 Converting circuit for automatically identifying alternating-current zero line and live lines
CN102655323B (en) * 2012-04-19 2017-09-29 美的集团股份有限公司 A kind of live wire automatic identification change-over circuit of alternating current zero
CN105445596A (en) * 2014-08-15 2016-03-30 神讯电脑(昆山)有限公司 Battery detection circuit
CN105445596B (en) * 2014-08-15 2019-01-11 神讯电脑(昆山)有限公司 Battery detection circuit
CN107024628A (en) * 2016-01-20 2017-08-08 德律科技股份有限公司 Test device and its AC power method for detecting
CN110998347A (en) * 2017-07-19 2020-04-10 李铉昌 Apparatus and method for improving leakage probing accuracy

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Legal Events

Date Code Title Description
C14 Grant of patent or utility model
GR01 Patent grant
CB03 Change of inventor or designer information

Inventor after: Lv Yaoming

Inventor before: Lv Hanquan

Inventor after: Lv Yaoming

Inventor before: Lv Hanquan

C53 Correction of patent for invention or patent application
COR Change of bibliographic data

Free format text: CORRECT: INVENTOR; FROM: LV HANQUAN TO: LV YAOMING

CX01 Expiry of patent term
CX01 Expiry of patent term

Granted publication date: 20100818