CN1696714A - Equipment for detecting electrified ground wire by using voltage comparator through detection signal provided from a resistor - Google Patents
Equipment for detecting electrified ground wire by using voltage comparator through detection signal provided from a resistor Download PDFInfo
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- CN1696714A CN1696714A CN 200510050010 CN200510050010A CN1696714A CN 1696714 A CN1696714 A CN 1696714A CN 200510050010 CN200510050010 CN 200510050010 CN 200510050010 A CN200510050010 A CN 200510050010A CN 1696714 A CN1696714 A CN 1696714A
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- voltage comparator
- voltage
- resistor
- zero
- detection signal
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Abstract
A live line detecting device of earth line includes bridging resistor between zero and earth line of power, connecting voltage difference of zero - earth line to reverse phase input end of voltage comparator via resistor dropping or dropping rectification, using DC voltage stabilized circuit for threshold voltage generator and connecting threshold voltage to the same phase input end of said comparator, applying integrated operation amplifier in voltage comparator which can change level at its output end from high to low level and can provide switching signal to executing mechanism when voltage is over safety value.
Description
Technical field the invention belongs to the application of electronic technology in detection range.
Before background technology the invention, ground wire electrified detection obtains by switching tube, and circuit is simple, but accuracy and anti-interference are relatively poor.
The purpose of summary of the invention the invention provides the voltage comparator earth wire charged testing device that a kind of resistor provides detection signal.
The invention solves the technical scheme that its technical matters adopts: comprise dropping resistor, threshold voltage signal source and voltage comparator; The dropping resistor cross-over connection is between the Zero-liue of power supply, the Zero-liue voltage difference is connected with the inverting input of voltage comparator behind resistor step-down or step-down rectifier, the threshold voltage generator is a direct current regulation circuit, threshold voltage is connected with the in-phase input end of voltage comparator, and voltage comparator is an integrated operational amplifier.Dropping resistor one end is connected with zero-power line, and the other end is connected with the inverting input of voltage comparator.The threshold voltage signal source is a DC source, obtains by regulator rectifier circuit or other dc signal sources, is connected with the in-phase input end of voltage comparator.Voltage comparator is universal integrated operational amplifier, one end of the Zero-liue difference generator after its inverting input and the step-down is connected, Zero-liue difference generator other end ground connection, the integrated operational amplifier in-phase input end is connected with dc signal source, and its output terminal is the ground wire electrification switching signal.
The beneficial effect of the invention is: when the invention detected the Zero-liue voltage difference above safe voltage as earth wire charged testing device, the voltage comparator output terminal became low level from high level, provides switching signal to topworks.The invention has the accuracy height in order to the interface of various types of ground wire electrified detection circuit, and the characteristics that anti-interference is good needing in the various household electrical appliance and similar electrical apparatus control circuit of earth wire charged protecting to be widely used in.
Appended drawings 1 is the electrical schematic diagram of the invention, comprises last figure and figure below.
Embodiment is consulted Fig. 1.The last figure of Fig. 1 is connected with voltage comparator by diode D for dropping resistor R, and D is IN4148.Fig. 1 figure below is that dropping resistor R is connected with voltage comparator.The invention dropping resistor R one end connects zero-power line N
In, the inverting input U of resistor R output terminal and integrated operational amplifier AJ
IConnect E
InBe ground wire.The threshold voltage generator is obtained by dc signal source, obtains by transformer lowering and stabilizing blood pressure or other dc signal sources, and present embodiment adopts dc constant voltage power supply+5V.In-phase input end U with integrated operational amplifier AJ
RConnect.Its output terminal U
OBe the ground wire electrification switching signal.Integrated operational amplifier AJ and peripheral circuit thereof constitute voltage comparator, and universal operational amplifier is selected in the invention for use, and its model is Ma709,5G922, FC1, SG006, BG305 etc.Voltage comparator negative input U
I＞positive input U
R, amplifier AJ output low level.Otherwise, voltage comparator negative input U
I＜positive input U
R, amplifier AJ exports high level.
Claims (4)
1, a kind of resistor provides the voltage comparator earth wire charged testing device of detection signal, comprises dropping resistor, threshold voltage signal source and voltage comparator; It is characterized in that the dropping resistor cross-over connection is between the Zero-liue of power supply, the Zero-liue voltage difference is connected with the inverting input of voltage comparator behind resistor step-down or step-down rectifier, the threshold voltage generator is a direct current regulation circuit, threshold voltage is connected with the in-phase input end of voltage comparator, and voltage comparator is an integrated operational amplifier.
2, a kind of resistor according to claim 1 provides the voltage comparator earth wire charged testing device of detection signal, it is characterized in that dropping resistor one end is connected with zero-power line, and the other end is connected with the inverting input of voltage comparator.
3, a kind of resistor according to claim 1 provides the voltage comparator earth wire charged testing device of detection signal, it is characterized in that the threshold voltage signal source is a DC source, obtain by regulator rectifier circuit or other dc signal sources, be connected with the in-phase input end of voltage comparator.
4, a kind of resistor according to claim 1 provides the voltage comparator earth wire charged testing device of detection signal, it is characterized in that voltage comparator is universal integrated operational amplifier, one end of the Zero-liue difference generator after its inverting input and the step-down is connected, Zero-liue difference generator other end ground connection, the integrated operational amplifier in-phase input end is connected with dc signal source, and its output terminal is the ground wire electrification switching signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510050010 CN1696714A (en) | 2005-06-09 | 2005-06-09 | Equipment for detecting electrified ground wire by using voltage comparator through detection signal provided from a resistor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510050010 CN1696714A (en) | 2005-06-09 | 2005-06-09 | Equipment for detecting electrified ground wire by using voltage comparator through detection signal provided from a resistor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1696714A true CN1696714A (en) | 2005-11-16 |
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ID=35349526
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200510050010 Pending CN1696714A (en) | 2005-06-09 | 2005-06-09 | Equipment for detecting electrified ground wire by using voltage comparator through detection signal provided from a resistor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1696714A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101334442B (en) * | 2008-07-29 | 2010-06-23 | 深圳和而泰智能控制股份有限公司 | Earth wire detector |
| CN102004183A (en) * | 2009-09-02 | 2011-04-06 | 鸿富锦精密工业（深圳）有限公司 | Voltage detection circuit |
| CN104044464A (en) * | 2014-06-27 | 2014-09-17 | 奇瑞汽车股份有限公司 | Sensor power supply output protection isolation circuit |
| CN110869776A (en) * | 2017-07-18 | 2020-03-06 | 日产自动车株式会社 | Voltage sensor diagnostic device and voltage sensor diagnostic method |
-
2005
- 2005-06-09 CN CN 200510050010 patent/CN1696714A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101334442B (en) * | 2008-07-29 | 2010-06-23 | 深圳和而泰智能控制股份有限公司 | Earth wire detector |
| CN102004183A (en) * | 2009-09-02 | 2011-04-06 | 鸿富锦精密工业（深圳）有限公司 | Voltage detection circuit |
| CN104044464A (en) * | 2014-06-27 | 2014-09-17 | 奇瑞汽车股份有限公司 | Sensor power supply output protection isolation circuit |
| CN110869776A (en) * | 2017-07-18 | 2020-03-06 | 日产自动车株式会社 | Voltage sensor diagnostic device and voltage sensor diagnostic method |
| CN110869776B (en) * | 2017-07-18 | 2022-03-11 | 日产自动车株式会社 | Voltage sensor diagnostic device and voltage sensor diagnostic method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |