CN2814421Y - Voltage comparator earth wire live-line detector capable of providing detected signal by transformer - Google Patents
Voltage comparator earth wire live-line detector capable of providing detected signal by transformer Download PDFInfo
- Publication number
- CN2814421Y CN2814421Y CN 200520101348 CN200520101348U CN2814421Y CN 2814421 Y CN2814421 Y CN 2814421Y CN 200520101348 CN200520101348 CN 200520101348 CN 200520101348 U CN200520101348 U CN 200520101348U CN 2814421 Y CN2814421 Y CN 2814421Y
- Authority
- CN
- China
- Prior art keywords
- voltage comparator
- voltage
- earth wire
- transformer
- 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.)
- Expired - Fee Related
Links
Images
Landscapes
- Measurement Of Current Or Voltage (AREA)
Abstract
The utility model relates to a voltage comparator earth wire electrification detector capable of providing detected signals by using a transformer, which belongs to the application of electronic technology in the field of detection. The detector comprises a step-down transformer, a threshold voltage signal source and a voltage comparator and is characterized in that the step-down transformer is bridged between a zero wire and an earth wire of a power supply; the voltage difference of the zero wire and the earth wire is connected with an inverting input terminal of the voltage comparator through the voltage reduction or the voltage reduction rectification of the transformer; a threshold voltage generator is a DC regulated circuit; moreover, threshold voltage is connected with a non-inverting input terminal of the voltage comparator. The voltage comparator is an integrated operational amplifier. When the utility model used as the earth wire electrification detector detects that the voltage difference of the zero wire and the earth wire exceeds safe voltage, the high level of the output terminal of the voltage comparator becomes low level and a switching signal is provided for an actuating mechanism. The utility model is used for interfaces of various types of earth wire electrification detection circuits and has the characteristics of high accuracy and good interference immunity. The utility model is used in controlling circuits of various household electric appliances and similar electric appliances, which require earth wire electrification protection.
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 transformer provides detection signal.
The invention solves the technical scheme that its technical matters adopts: comprise step-down transformer, threshold voltage signal source and voltage comparator; The step-down transformer 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 transformer 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.
The step-down transformer primary side is connected with the power supply Zero-liue, and output terminal 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, and its inverting input is connected with Zero-liue difference generator after the step-down, and its 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.
Description of drawings Fig. 1, Fig. 2 are electrical schematic diagram of the present utility model.
Embodiment is consulted accompanying drawing.Fig. 1 is that T level of step-down transformer is connected with voltage comparator by diode D, consults Fig. 2 and is connected with voltage comparator for T level of step-down transformer, and D is IN4148.The primary coil of the invention step-down transformer T is connected across zero-power line N
InWith ground wire E
InBetween, the inverting input U of its output terminal and integrated operational amplifier AJ
IConnect, 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
0Be the ground wire electrification switching signal.Integrated operational amplifier AJ and locate to enclose circuit and constitute voltage comparator, universal operational amplifier is selected in the invention for use, and its model is 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 transformer provides the voltage comparator earth wire charged testing device of detection signal, comprises step-down transformer, threshold voltage signal source and voltage comparator; It is characterized in that the step-down transformer 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 transformer 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 transformer according to claim 1 provides the voltage comparator earth wire charged testing device of detection signal, it is characterized in that the step-down transformer primary side is connected with the power supply Zero-liue, and output terminal is connected with the inverting input of voltage comparator.
3, a kind of transformer 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 transformer 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, its inverting input is connected with Zero-liue difference generator after the step-down, its 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 200520101348 CN2814421Y (en) | 2005-04-01 | 2005-04-01 | Voltage comparator earth wire live-line detector capable of providing detected signal by transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520101348 CN2814421Y (en) | 2005-04-01 | 2005-04-01 | Voltage comparator earth wire live-line detector capable of providing detected signal by transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2814421Y true CN2814421Y (en) | 2006-09-06 |
Family
ID=36949508
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200520101348 Expired - Fee Related CN2814421Y (en) | 2005-04-01 | 2005-04-01 | Voltage comparator earth wire live-line detector capable of providing detected signal by transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2814421Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112485501A (en) * | 2020-11-20 | 2021-03-12 | 贵州电网有限责任公司 | Distribution transformer earth connection alarm device |
-
2005
- 2005-04-01 CN CN 200520101348 patent/CN2814421Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112485501A (en) * | 2020-11-20 | 2021-03-12 | 贵州电网有限责任公司 | Distribution transformer earth connection alarm device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105896622B (en) | High reliability transmission line of electricity induction energy fetching power supply | |
| CN104426370B (en) | Power supply adaptor and its adaptation control circuit and Adaptive Control Method | |
| CN102548095B (en) | Lamp and driving circuit thereof | |
| CN204190637U (en) | A kind of power adapter circuit | |
| CN103166175A (en) | Input overvoltage protection circuit for light-emitting diode (LED) driving power supply | |
| CN103856086A (en) | Current transformer electricity taking control method and system | |
| CN201112989Y (en) | Charging device for extended wire socket | |
| CN208226892U (en) | A kind of small-sized variable-frequency electric power voltage-stabilizer | |
| CN1696714A (en) | Equipment for detecting electrified ground wire by using voltage comparator through detection signal provided from a resistor | |
| CN2859550Y (en) | Voltage comparator earth wire electriferous detecting device with resistor that supplies detecting signal | |
| CN2814421Y (en) | Voltage comparator earth wire live-line detector capable of providing detected signal by transformer | |
| CN103513075B (en) | near infrared reading device and ammeter | |
| CN202602552U (en) | Conversion circuit capable of converting AC 220V into DC 5V directly | |
| CN209608328U (en) | The power protecting circuit of a kind of electronic equipment | |
| CN208224355U (en) | A kind of alternating current undervoltage detection warning circuit | |
| CN106714385B (en) | A kind of internal stepdown circuit structure of LED drive power | |
| CN203630177U (en) | Near-infrared reading device and ammeter | |
| CN206117268U (en) | Numerical control dynamic output machine that charges based on CM6800 chip | |
| CN105576988B (en) | A kind of coupling energy taking power supply adapting to the work of wide dynamic range bus current | |
| CN205142032U (en) | Input/output current-limiting voltage-stabilizing power supply | |
| CN203205828U (en) | LED driving power supply input overvoltage protection circuit | |
| CN208904338U (en) | A kind of intelligent socket of achievable intelligent charge | |
| CN203119759U (en) | Boost DC-DC converter | |
| CN203206133U (en) | Universal socket | |
| CN108321923B (en) | UPS charger output load alternating current-direct current hybrid detection circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |