CN111175562A - Bistable liquid crystal current indicator - Google Patents
Bistable liquid crystal current indicator Download PDFInfo
- Publication number
- CN111175562A CN111175562A CN201911407252.5A CN201911407252A CN111175562A CN 111175562 A CN111175562 A CN 111175562A CN 201911407252 A CN201911407252 A CN 201911407252A CN 111175562 A CN111175562 A CN 111175562A
- Authority
- CN
- China
- Prior art keywords
- liquid crystal
- current
- bistable liquid
- reset
- singlechip
- 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
Links
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/0092—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring current only
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
- Liquid Crystal (AREA)
Abstract
The invention discloses a bistable liquid crystal current indicator.A to-be-detected object passes through an electricity taking coil, and when the to-be-detected object has current, an induction coil secondary side generates induction current; after the induced current generated by the electricity taking coil is rectified by the rectifier bridge, the energy storage capacitor is charged and enters the singlechip as a current signal; the singlechip is used for carrying out operation comparison on the size of the induction current and sending an operation result to the driving circuit as a driving signal; the driving circuit receives an instruction sent by the singlechip and drives the bistable liquid crystal indicator to turn over the display state; the reset coil generates a reset current signal, the reset current signal is input into the singlechip, and the display state of the bistable liquid crystal indicator is driven to reset through the driving circuit. The bistable liquid crystal display device does not need to use an independent power supply, the current obtaining coil can sense the current as long as the current flows through the object to be detected, the sensitivity is high, whether the display state of the bistable liquid crystal display device is driven to turn over or not is judged through internal processing of the single chip microcomputer, the state is always kept to be displayed, and the maintenance is convenient.
Description
Technical Field
The invention relates to a bistable liquid crystal current indicator.
Background
In the traditional applications of ground fault indication, lightning stroke monitoring of a lightning arrester, zero sequence current monitoring, leakage indication and the like in the power distribution industry, which need to detect current or current mutation, the problem of power supply electricity taking exists, and the general solution is to install a chemical battery or a solar battery and reduce the power consumption of an instrument as much as possible. However, the replacement of the battery and the reliability problem bring new difficulties to the maintenance of the system.
Bistable liquid crystal technology, a new type of liquid crystal display technology, is currently a unique reflective display technology that is visible in the sun and consumes only very little power when switching the display. And the characteristic that the last image can be continuously displayed after power failure is realized, so that the state indication is more conveniently realized under the condition of limited energy.
Disclosure of Invention
In view of the above problems, it is an object of the present invention to provide a bistable liquid crystal current indicator that is simple in structure, highly adaptable, passive and sensitive.
The technical scheme for realizing the invention is as follows
The bistable liquid crystal current indicator comprises a power-taking coil, an overvoltage protection circuit, a rectifier bridge, an energy storage capacitor, a singlechip, a drive circuit, a bistable liquid crystal indicator and a reset coil,
the object to be measured passes through the electricity taking coil, and when the current passes through the object to be measured, the secondary side of the electricity taking coil generates induced current;
the overvoltage protection circuit, the rectifier bridge and the energy storage capacitor are connected between the secondary side of the power taking coil and the input end of the single chip microcomputer;
after the induced current generated by the power taking coil is rectified by the rectifier bridge, the energy storage capacitor is charged and used as system energy to start the single chip microcomputer; after the singlechip is started, the size of the induced current is calculated and compared, and the calculation result is sent to a driving circuit as a driving signal;
the driving circuit receives an instruction sent by the singlechip and drives the bistable liquid crystal indicator to turn over the display state;
the reset coil generates a reset current signal, the reset current signal is input into the singlechip, and the display state of the bistable liquid crystal indicator is driven to reset through the driving circuit.
The induced current entering the singlechip drives the singlechip to start up; the processing steps in the single chip microcomputer are as follows:
a. comparing the induced current obtained by the singlechip with a preset signal threshold value for driving the bistable liquid crystal indicator to overturn;
when the obtained induced current exceeds a preset signal threshold value for driving the bistable liquid crystal indicator to turn over, the single chip microcomputer sends a turning signal to the driving circuit, and the driving circuit drives the bistable liquid crystal indicator to turn over the display state;
when the obtained induced current does not exceed a preset signal threshold value for driving the bistable liquid crystal indicator to overturn, entering the step b;
b. when the induced current obtained by the singlechip does not exceed a preset signal threshold value for driving the bistable liquid crystal indicator to overturn, the singlechip compares the induced current with a reset signal threshold value;
when the induced current exceeds a preset reset signal threshold value, the single chip sends a reset signal to the driving circuit for inputting the reset signal of the single chip, and the driving circuit drives the display state of the bistable liquid crystal indicator to reset;
when the induced current does not exceed the preset reset signal threshold, the single chip microcomputer judges the induced current as an interference signal and finishes comparison.
By adopting the technical scheme, the electricity taking coil is sleeved outside the object to be detected, and the current passing through the object to be detected is detected in real time; when the obtained induced current exceeds a preset signal threshold value for driving the bistable liquid crystal indicator to overturn, the single chip microcomputer sends an overturning signal to the driving circuit, the driving circuit drives the display state of the bistable liquid crystal indicator to overturn, the situation that the current passes through the object to be detected is indicated, the display state is maintained through the display of the bistable liquid crystal indicator, and the checking and the overhauling of workers are facilitated. Because the current of the ground fault in the power distribution system is generally small but enough to drive the turnover of the bistable liquid crystal once, and the liquid crystal does not need to be maintained by electric energy after being turned over, the judgment and indication of the tiny leakage current can be realized. And is beneficial to the quick positioning of fault points by workers. Meanwhile, the device can be applied to any critical occasions where micro current needs to be indicated, such as light poles, air conditioner outdoor units, fountain pumps or electric leakage of other critical equipment, faults are easy to find, and personnel safety is guaranteed. The bistable liquid crystal display needs weak energy only when switching display, so that an independent power supply is not needed, the current obtaining coil can sense the current as long as the current flows through an object to be detected, the sensitivity is high, whether the display state of the bistable liquid crystal indicator is driven to turn or not is judged through internal processing of the single chip microcomputer, the state is always maintained to be displayed, and the maintenance is convenient.
Drawings
FIG. 1 is a schematic view of the present invention;
FIG. 2 is a flow chart of the operation of the single chip microcomputer according to the present invention;
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the drawings of the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the invention without any inventive step, are within the scope of protection of the invention.
As shown in fig. 1 and 2, the bistable liquid crystal current indicator includes a power taking coil 1, an overvoltage protection circuit 2, a rectifier bridge 3, an energy storage capacitor 4, a single chip, a driving circuit, a bistable liquid crystal indicator and a reset coil, wherein an object to be detected passes through the power taking coil, and when a current passes through the object to be detected, an induced current is generated at a secondary side of the power taking coil.
The overvoltage protection circuit, the rectifier bridge and the energy storage capacitor are connected between the secondary side of the power taking coil and the input end of the single chip microcomputer; the overvoltage protection circuit limits voltage entering the system to protect the safety of the system; the rectifier bridge rectifies current entering the system; the energy storage capacitor is connected in parallel with the input end of the single chip microcomputer, and can be charged through the induced current to maintain the system power utilization.
After the induced current generated by the power taking coil is rectified by the rectifier bridge, the energy storage capacitor is charged and used as system energy to start the single chip microcomputer; after the singlechip is started, the magnitude of the induced current is compared and calculated, and the calculation result is used as a driving signal to be sent to a driving circuit;
the driving circuit receives an instruction sent by the singlechip and drives the bistable liquid crystal indicator to turn over the display state;
the reset coil generates a reset current signal, the reset current signal is input into the singlechip, and the display state of the bistable liquid crystal indicator is driven to reset through the driving circuit.
The induced current entering the singlechip drives the singlechip to start up; the processing steps in the single chip microcomputer are as follows:
a. comparing the induced current obtained by the singlechip with a preset signal threshold value for driving the bistable liquid crystal indicator to overturn;
when the obtained induced current exceeds a preset signal threshold value for driving the bistable liquid crystal indicator to turn over, the single chip microcomputer sends a turning signal to the driving circuit, and the driving circuit drives the bistable liquid crystal indicator to turn over the display state;
when the obtained induced current does not exceed a preset signal threshold value for driving the bistable liquid crystal indicator to overturn, entering the step b;
b. when the induced current obtained by the singlechip does not exceed a preset signal threshold value for driving the bistable liquid crystal indicator to overturn, the singlechip compares the induced current with a reset signal threshold value;
when the induced current exceeds a preset reset signal threshold value, the single chip sends a reset signal to the driving circuit for inputting the reset signal of the single chip, and the driving circuit drives the display state of the bistable liquid crystal indicator to reset;
when the induced current does not exceed the preset reset signal threshold, the single chip microcomputer judges the induced current as an interference signal and finishes comparison. Waiting for the next entry of the induced current.
The electricity-taking coil in the bistable liquid crystal indicator adopts a mutual inductor structure with a primary side having only 1 turn of winding, and induces residual current, zero sequence current, leakage current and the like from a circuit through the electricity-taking coil by utilizing the electromagnetic induction principle, an electromagnetic field is caused to change due to the generation of induced current, and then a secondary side is caused to generate induced current, and the secondary current is subjected to protection, rectification, energy storage, logic and drive bistable liquid crystal to change and display, so that the current indication is realized; and simultaneously, a reset coil is arranged for manual reset.
Combining induction power taking with bistable liquid crystal technology: 1. the problem of general indicating circuit, induction electricity energy of getting is low excessively, and the circuit is difficult to stable work is solved. 2. The advantage that the bistable liquid crystal does not consume electric energy in a stable state is utilized, and the state maintenance without energy consumption is realized. 3. The bistable liquid crystal has no moving part, thus avoiding the problems of abrasion and low reliability of the moving part of the mechanical indicating device.
Claims (2)
1. The bistable liquid crystal current indicator is characterized by comprising a power-taking coil, an overvoltage protection circuit, a rectifier bridge, an energy storage capacitor, a singlechip, a drive circuit, a bistable liquid crystal indicator and a reset coil,
the object to be measured passes through the electricity taking coil, and when the current passes through the object to be measured, the secondary side of the electricity taking coil generates induced current;
the overvoltage protection circuit, the rectifier bridge and the energy storage capacitor are connected between the secondary side of the power taking coil and the input end of the single chip microcomputer;
after the induced current generated by the power taking coil is rectified by the rectifier bridge, the energy storage capacitor is charged and used as system energy to start the single chip microcomputer; after the singlechip is started, the size of the induced current is calculated and compared, and the calculation result is sent to a driving circuit as a driving signal;
the driving circuit receives an instruction sent by the singlechip and drives the bistable liquid crystal indicator to turn over the display state;
the reset coil generates a reset current signal, the reset current signal is input into the singlechip, and the display state of the bistable liquid crystal indicator is driven to reset through the driving circuit.
2. The bistable liquid crystal current indicator of claim 1, wherein the induced current entering the single-chip microcomputer drives the single-chip microcomputer to turn on; the processing steps in the single chip microcomputer are as follows:
a. comparing the induced current obtained by the singlechip with a preset signal threshold value for driving the bistable liquid crystal indicator to overturn;
when the obtained induced current exceeds a preset signal threshold value for driving the bistable liquid crystal indicator to turn over, the single chip microcomputer sends a turning signal to the driving circuit, and the driving circuit drives the bistable liquid crystal indicator to turn over the display state;
when the obtained induced current does not exceed a preset signal threshold value for driving the bistable liquid crystal indicator to overturn, entering the step b;
b. when the induced current obtained by the singlechip does not exceed a preset signal threshold value for driving the bistable liquid crystal indicator to overturn, the singlechip compares the induced current with a reset signal threshold value;
when the induced current exceeds a preset reset signal threshold value, the single chip sends a reset signal to the driving circuit for inputting the reset signal of the single chip, and the driving circuit drives the display state of the bistable liquid crystal indicator to reset;
when the induced current does not exceed the preset reset signal threshold, the single chip microcomputer judges the induced current as an interference signal and finishes comparison.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911407252.5A CN111175562A (en) | 2019-12-31 | 2019-12-31 | Bistable liquid crystal current indicator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911407252.5A CN111175562A (en) | 2019-12-31 | 2019-12-31 | Bistable liquid crystal current indicator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111175562A true CN111175562A (en) | 2020-05-19 |
Family
ID=70649110
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911407252.5A Pending CN111175562A (en) | 2019-12-31 | 2019-12-31 | Bistable liquid crystal current indicator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111175562A (en) |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ATE132287T1 (en) * | 1989-10-06 | 1996-01-15 | Canon Kk | DISPLAY DEVICE |
| GB0225405D0 (en) * | 2002-10-31 | 2002-12-11 | Hewlett Packard Co | Bistable nematic liquid crystal display device |
| CN1440012A (en) * | 2002-02-18 | 2003-09-03 | 美能达株式会社 | Liquid-crystal display devices |
| CN203786185U (en) * | 2014-04-14 | 2014-08-20 | 国家电网公司 | Current indicator |
| CN203909212U (en) * | 2014-02-13 | 2014-10-29 | 珠海创能科世摩电气科技有限公司 | Power distribution network line fault indicator |
| CN105425104A (en) * | 2015-11-06 | 2016-03-23 | 袁孝红 | Power transmission line fault indicator |
| CN205809227U (en) * | 2016-06-13 | 2016-12-14 | 光一科技股份有限公司 | A kind of distribution line status monitoring instruction device |
| CN206362882U (en) * | 2016-12-16 | 2017-07-28 | 云南电网有限责任公司玉溪供电局 | Active injecting signal singlephase earth fault positions rear end fault detector |
| CN107490747A (en) * | 2016-06-13 | 2017-12-19 | 光科技股份有限公司 | A kind of distribution line state monitoring method and corresponding monitoring instruction device |
| CN110412425A (en) * | 2019-08-08 | 2019-11-05 | 国网上海市电力公司市北供电公司 | A kind of cable-type board turning accident indicator and its method |
-
2019
- 2019-12-31 CN CN201911407252.5A patent/CN111175562A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ATE132287T1 (en) * | 1989-10-06 | 1996-01-15 | Canon Kk | DISPLAY DEVICE |
| CN1440012A (en) * | 2002-02-18 | 2003-09-03 | 美能达株式会社 | Liquid-crystal display devices |
| GB0225405D0 (en) * | 2002-10-31 | 2002-12-11 | Hewlett Packard Co | Bistable nematic liquid crystal display device |
| CN203909212U (en) * | 2014-02-13 | 2014-10-29 | 珠海创能科世摩电气科技有限公司 | Power distribution network line fault indicator |
| CN203786185U (en) * | 2014-04-14 | 2014-08-20 | 国家电网公司 | Current indicator |
| CN105425104A (en) * | 2015-11-06 | 2016-03-23 | 袁孝红 | Power transmission line fault indicator |
| CN205809227U (en) * | 2016-06-13 | 2016-12-14 | 光一科技股份有限公司 | A kind of distribution line status monitoring instruction device |
| CN107490747A (en) * | 2016-06-13 | 2017-12-19 | 光科技股份有限公司 | A kind of distribution line state monitoring method and corresponding monitoring instruction device |
| CN206362882U (en) * | 2016-12-16 | 2017-07-28 | 云南电网有限责任公司玉溪供电局 | Active injecting signal singlephase earth fault positions rear end fault detector |
| CN110412425A (en) * | 2019-08-08 | 2019-11-05 | 国网上海市电力公司市北供电公司 | A kind of cable-type board turning accident indicator and its method |
Non-Patent Citations (2)
| Title |
|---|
| 张晓君: "顶点双稳态液晶显示技术简述及应用", 《轻工科技》 * |
| 王昊: "双稳态液晶显示技术的研究进展", 《信息记录材料》 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106970304B (en) | Simple power transmission line fault online positioning and monitoring system | |
| CN207074246U (en) | A kind of GIS partial discharge on-line monitoring system | |
| CN103812233B (en) | Micro-electric current inductive power supply type temperature measurement and alarm device and thermometric alarm method | |
| CN108398656A (en) | High-voltage LED street lamp, method for diagnosing faults and readable storage medium storing program for executing | |
| CN109660018A (en) | A kind of transmission line of electricity sensing electricity getting device based on Rogowski coil | |
| CN204831613U (en) | Wireless temperature sensor | |
| CN111175562A (en) | Bistable liquid crystal current indicator | |
| CN104635023A (en) | High-voltage electrification acousto-optic indicating device | |
| CN107490747B (en) | Distribution line state monitoring method and corresponding monitoring and indicating device | |
| CN201509075U (en) | Labor frequency mutually ordered survey meter and relay | |
| CN207156958U (en) | direct-current charging post | |
| CN106525265B (en) | Wireless temperature monitoring and indicating device for capacitor | |
| CN208249720U (en) | Tower crane intelligent power-off control module | |
| CN208860916U (en) | Null line breaking alarm positioning device | |
| CN203352155U (en) | Microcomputer monitoring protecting device for current transformer | |
| CN102435327B (en) | Wireless temperature monitor of power equipment based on induction energy storage | |
| CN203326525U (en) | Novel high voltage line bumper | |
| CN215453154U (en) | Base station power saving device | |
| CN207819552U (en) | A kind of high pressure measurement negative control terminal dual-power automatic switching transformation conversion equipment | |
| CN206638804U (en) | A kind of intelligent electric meter supervising device | |
| CN206573608U (en) | A kind of test device for relay protection with continuation of the journey function | |
| CN212135193U (en) | Distribution transformer running state monitoring device | |
| CN214174492U (en) | Safety electroscope for alternating current transmission and distribution line | |
| CN205407230U (en) | Converter with prevent that input lacks looks function | |
| CN205507004U (en) | Insulating operating mode real -time detection early warning device of power cable in service |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for 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: 20200519 |