CN104181488A - AC voltage-resistant testing apparatus - Google Patents
AC voltage-resistant testing apparatus Download PDFInfo
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- CN104181488A CN104181488A CN201410377013.0A CN201410377013A CN104181488A CN 104181488 A CN104181488 A CN 104181488A CN 201410377013 A CN201410377013 A CN 201410377013A CN 104181488 A CN104181488 A CN 104181488A
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Abstract
The invention discloses an AC voltage-resistant testing apparatus. The voltage of a voltage-resistant instrument device is sampled through a voltage sampling circuit, the sampled voltage is sent to a metering apparatus, the metering apparatus transmits data to a hybrid processor, and the hybrid processor displays the data on a display unit; and the voltage sampling circuit adopts a resistor voltage division principle and is connected in series with multiple resistors, and the two ends of each resistor from two resistors at extreme ends are connected in parallel with a corresponding capacitor. The AC voltage-resistant testing apparatus realizes accurate measurement of a voltage-resistant instrument for the first time and is high in measuring voltage. The voltage testing scope of the apparatus provided by the invention is from 1000 V to 5000 V. The accuracy of the apparatus is high. Voltage is displayed with two decimal points, the precision reaches 0.1 %, and the leakage current scope is from 0.05 mA to 0.25 mA.
Description
Technical field
The present invention relates to a kind of ac voltage withstanding proving installation of high pressure measurement.
Background technology
Voltage resistant instrument belongs to measuring appliance, be mainly used between electric power enterprise, the instrument of the testing of equipment such as ammeter, collector, terminal between power supply enterprise and user, and standard Hi-pot Tester and calibrating installation thereof are the important component parts of weighing the equipment accuracys such as ammeter, collector, terminal.Carry out smoothly like clockwork for guarantee on-the-spot test work, it is particularly important that ac voltage withstanding proving installation seems.
International and the domestic voltage resistant instrument measuring appliance accurately of also not testing at present, and ac voltage withstanding test event is one of electric energy meter forcible inspection of item, therefore the accuracy to ac voltage withstanding instrument is had higher requirement, therefore the ac voltage withstanding proving installation that the designs a accurate-metering voltage resistant instrument particular importance that seems, can meet the potential market demand of ac voltage withstanding proving installation simultaneously.
Summary of the invention
The deficiency existing for solving prior art, the invention discloses ac voltage withstanding proving installation, solves current electric energy meter and does the problem that the accuracy of voltage resistant instrument in voltage-withstand test process cannot be judged, this proving installation accuracy reaches 0.1%.Device design is succinct, directly perceived, light, and handled easily personnel wiring, test, reading out data can greatly improve reliability and the accuracy of voltage-withstand test.
For achieving the above object, concrete scheme of the present invention is as follows:
Ac voltage withstanding proving installation, to sampling by voltage sample circuit from the voltage of voltage resistant instrument equipment, voltage after sampling is sent into measuring apparatus, and data are sent to hybrid processor by measuring apparatus, and described hybrid processor shows data on display unit; Described voltage sample circuit adopts the principle of electric resistance partial pressure, multiple resistance of having connected, ground connection after two resistance of most end are all in parallel with corresponding electric capacity;
Described voltage sample circuit is connected with the V2N/V2P voltage channel of measuring apparatus, utilize the complete differential input mode of measuring apparatus, high-voltage signal from voltage resistant instrument is become to the AC signal that amplitude is 0-1V by voltage sample circuit, send into measuring apparatus by voltage channel.
Proving installation power on or measuring apparatus be disturbed reset time, calibration data are upgraded by SPI mouth by hybrid processor; SIG signal is a handshake for notifying hybrid processor, therefore hybrid processor is monitored SIG signal, for make power on and reset after measuring apparatus can synchronize with hybrid processor and carry out SPI operation, its reseting procedure keeps RESET signal to be greater than 20us low level, chip reset, now SIG output high level, then hybrid processor is drawn high RESET signal, and after setting-up time, measuring apparatus completes initialization, SIG output low level signal, then carries out SPI operation.
Decoupling capacitor is all accessed in the RESET port of described measuring apparatus and the SIG input port of hybrid processor.
Described hybrid processor is also connected with infrared communication unit, display unit, storage unit, clock circuit, keyboard and battery.
Described measuring apparatus is by SPI interface and hybrid processor communication.
Described storage unit comprises storage chip AT24LC256 and Flash storer AT45DB161D, for data are stored.
Described infrared communication unit comprises infrared receiver, infrared transmitting element and infrared wakeup unit.
Described infrared communication unit original state/CVIR is high level, in the time having outside infrared signal to irradiate, and the conducting of photodiode V8 receiving optical signals, the base stage of triode V10 is high level, triode V10 conducting, IR-R becomes low level, and now hybrid processor control/CVIR pin is low level, open receiving tube VI pin, VIR is for becoming high level, and receiving optical signals sends after modulation /demodulation, IR-T pin, by hybrid processor control, produces PWM.
The outside of described proving installation also comprises insulation crust.
This device utilizes the principle of electric resistance partial pressure, to sampling from voltage resistant instrument equipment (1000V-5000V) voltage, sampled voltage is sent in computation chip ATT7026E by resistor voltage divider circuit, ATT7026E and MSP430F5438 carry out communication by SPI interface, and sampled value by liquid crystal display out.
Outside voltage resistant instrument voltage is by the connection terminal access of crust of the device, and when voltage resistant instrument is started working, proving installation is measured the output voltage of voltage resistant instrument by metering circuit, by liquid crystal display out.
Hybrid processor, carry out communication by SPI interface and ATT7026E, ATT7026E measures sampling voltage by sample circuit, variable shows by LCD screen, sample circuit is by the principle of electric resistance partial pressure, carry out data storage by storage chip AT24LC256 and Flash storer AT45DB161D, when CPU is during in low power consumpting state, can be by the infrared ammeter that wakes up, read test record and time etc., simultaneous communications also utilizes infrared receiving tube HM238RL-W to carry out the operations such as calibration.Also can button Rouser, turn over up and down screen display and show.
The high-voltage signal (1000V-5000V) being sent by voltage resistant instrument, after voltage sample circuit 1 dividing potential drop, become the voltage of amplitude at 0-1V, deliver to computation chip control circuit 2 by V2N/V2P pin, the positive and negative analog input pin of V2N/V2P voltage channel.Complete differential input mode; the maximum input of normal work Vpp is ± 1.5V; there is esd protection circuit two pin inside; maximum is born voltage; computation chip collects magnitude of voltage and sends in MCU chip controls circuit 3 by SPI serial communication interface; the SPI interface of computation chip adopts slave mode work, uses 2 control lines and 2 data line: CS, SCLK, DIN and DOUT.MCU control circuit 3 shows the magnitude of voltage on the voltage resistant instrument collecting by LCD display circuit 6, when needs are infrared while waking up, start infrared communication circuit 5, infrared communication as receiving tube, selects high efficiency IR7393C as power valve by integrated infrared remote receiver IRM3638L.The data of at every turn doing withstand voltage experiment store by storer event, time, maximum voltage value, duration when event comprises experiment, can show by split screen.Memory circuit 7 comprises Serial E 2PROM and FLASH storer, serial EEPROM, and memory capacity is 256Kbit, it and MCU adopt I2C interface to carry out communication.Pressure resistant testing device is generally operational in low power consumpting state, just need to wake CPU, opening power circuit while doing voltage-withstand test up.Adopt powered battery, cell voltage is inputted by VIN, and Enable Pin EN sets high, and after linear voltage decreasing chip LDO, reduces to 5V, reaches the operating voltage of CPU.
The principle of work of ac voltage withstanding proving installation: gather the high-voltage signal that voltage resistant instrument produces by resistor voltage divider circuit, sending into computation chip measures, computation chip and MCU carry out communication by SPI interface, and computation chip is high precision three-phase activereactive energy the special metering IC ATT7026E.The integrated Liao Liu of ATT7026E road second order sigma-delta ADC, the circuit such as the digital signal processing of reference voltage circuit and all power, energy, effective value, power factor and frequency measurement.ATT7026E can measure each phase and close the active power of phase, reactive power, applied power, meritorious energy and quadergy, can also measure the parameters such as each phase current, voltage effective value, power factor, phase angle, frequency, fully meet the demand of three-phase compound tariff multifunctional electric energy meter simultaneously.ATT7026A supports resistance network calibration and two kinds of modes of software regulating meter.Resistor network calibration is applicable to the system applies that voltage channel adopts resistor network to sample, just can be by Systematic Error Correction in the requirement of 1 grade of table by simple regulating resistance network.And software regulating meter is to compensate by the relevant gain of calibration register pair, phase place, can be by Systematic Error Correction in the requirement of 0.5 grade of table.Meritorious, idle frequency verification output CF1, CF2 provide instantaneous meritorious, reactive power information, can directly receive standard scale, carry out error correction.When can ensureing to power up with power-off, the voltage monitoring circuit of ATT7026E inside normally works.In ATT7026E sheet, comprise (AVcc) power supply supervisory circuit, continuously analog power inlet wire is monitored.When supply voltage is during lower than 4V ± 5%, chip will be reset.This is conducive to that circuit powers on and correct startup and the normal work of chip when power down.Power supply supervisory circuit is arranged in time delay and filtering link, and this prevents the mistake that power supply noise causes to the full extent, for ensureing the chip reply power decoupling of normally working, makes the fluctuation of AVcc be no more than 5V ± 5%.
Infrared communication carrys out data information using infrared as medium, is carried out the wireless receiving and dispatching of settling signal by infrared remote receiver and infrared transmitter.At transmitting terminal, the digital signal sending, after suitable coding and modulation, is sent into electro-optical conversion circuit, drive infrared diode transmitting infrared light pulse, at receiving end, infrared remote receiver carries out opto-electronic conversion to the infrared signal of receiving, and after modulating and decoding, recover original signal.Infrared transmitting circuit is made up of modulation circuit, driving circuit and infrared emission device, and infrared receiving circuit is made up of infrared receiver device, pre-amplification circuit, demodulator circuit etc.
Infrared communication is easily subject to restriction and the interference of environmental baseline, and adopts the infrared transmitting tube of high transmit power or can greatly improve the antijamming capability of communication with the receiver of light filter.The design of this device selects high efficiency IR7393C as power valve, and integrated infrared remote receiver IRM3638L is as receiving tube.Wherein, the luminous power of IR7393C reaches 150mW, can effectively strengthen the antijamming capability of infrared communication; IRM3638L receiver is packaged as a whole photodiode, prime amplifier and detuner, has the effect that receives infrared signal, built-in signal amplification, 38kHZ filtering, wave test output.
The E2PROM that this programme uses adopts the AT24LC256 of atmel corp, and Flash adopts the AT45DB161D Flash storer of atmel corp, and clock chip is the RX-8205 of EPSON company, and LCD liquid crystal is HQ71291-01 (high durable).
Beneficial effect of the present invention:
When tradition three-phase kilowatt-hour meter does withstand voltage test, the error of voltage resistant instrument is larger, and precision is not high, cannot accurately measure the withstand voltage that three-phase kilowatt-hour meter bears, and withstand voltage experiment is one of forcible inspection of item of electric energy meter experiment, so voltage-withstand test needs accurately to measure.The present invention adopts high-precision measuring sampling A/D chip, and in input dynamic duty scope (1000:1), nonlinear measurement error is less than 0.1%.Accurate measurement, withstand voltage event can be inquired about, and can preserve withstand voltage event 10 times, and image data is more reliable.
1, this device has been realized the accurate measurement to voltage resistant instrument first, and measuring voltage is high.Apparatus of the present invention test voltage scope is 1000-5000V.
2, device accuracy is high.Voltage shows reservation two-decimal, and precision reaches 0.1%, and leakage current scope is at 0.05mA-0.25mA.
3, the data of withstand voltage experiment store by event by storer, time, maximum voltage value, duration when event comprises experiment, can show by split screen.
4, device power supply is simple, adopts powered battery, and power consumption is little, is approximately 8mA, can record more than 10,000 times withstand voltage test.
5, device design is light, succinct, directly perceived, has good application prospect.
Brief description of the drawings
Fig. 1 is the principle of work block diagram of pressure resistant testing device of the present invention;
Fig. 2 is electric resistance partial pressure sample circuit;
Fig. 3 computation chip ATT7026E unit;
Fig. 4 is MCU unit MSP430F5438;
Fig. 5 is infrared communication unit;
Fig. 6 liquid crystal display circuit;
Fig. 7 storage unit;
Fig. 8 power circuit;
Fig. 9 clock circuit;
In figure, 1 high input voltage signal, 2 voltage sample circuits, 3 computation chip ATT7026E, 4MCU unit, 5 infrared communication unit, 6 display unit LCD, 7 storage unit, 8 clock circuits, 9 buttons, 11LDO chip, 12 batteries.
Embodiment:
Below in conjunction with accompanying drawing, the present invention is described in detail:
As shown in Figure 1, ac voltage withstanding proving installation, the high input voltage signal 1 of ac voltage withstanding instrument is sent to voltage sample circuit 2, voltage sample circuit 2 carries out voltage sampling to high input voltage signal 1, the signal after sampling is sent to computation chip ATT7026E3 by voltage sample circuit 2, computation chip ATT7026E3 is sent to MCU unit 4 after acknowledge(ment) signal is measured to processing, MSP430F5438, MCU unit 4 shows data on display unit LCD6, MCU unit 4 is also connected with button 9, for receiving the instruction that button 9 operates, MCU unit 4 also with infrared communication unit 5, storage unit 7 and clock circuit 8 communicate, MCU unit 4 and computation chip ATT7026E3 are all connected with LDO chip 11, LDO chip 11 is connected with battery 12.
Voltage sample circuit is converted into low-voltage signal the voltage resistant instrument high-voltage signal collecting, send in computation chip, computation chip carries out communication by control chip, the magnitude of voltage collecting by liquid crystal Circuit display out, voltage resistant instrument send high-voltage signal as an event by storage chip E2PROM circuitry stores, power circuit comprises linear voltage regulator LDO chip, opens LDO chip when work.
The V2N/V2P voltage channel that adopts computation chip, complete differential input mode, becomes by resistor voltage divider circuit the AC signal that amplitude is 0-1V from the high-voltage signal of voltage resistant instrument, sends into computation chip by voltage channel.The ADC of computation chip is 16, and ADC sampling rate can reach 3.2KHZ.Can accurately gather the high-voltage signal of voltage resistant instrument output, error, 0.1%, can record the lasting time of high-voltage signal simultaneously, and computation chip sample rate is fast especially, and the duration records complete, and high pressure event preserves by storage chip.
When test, export ac voltage withstanding instrument high-pressure side, is connected on the forceful electric power terminal of proving installation, and ac voltage withstanding instrument low-pressure side is exported, and is connected on the light current terminal of proving installation.
This device utilizes the principle of electric resistance partial pressure, to sampling from voltage resistant instrument equipment (1000V-5000V) voltage, sampled voltage is sent in computation chip ATT7026E by resistor voltage divider circuit, ATT7026E and MSP430F5438 carry out communication by SPI interface, and sampled value by liquid crystal display out.
Fig. 2 is electric resistance partial pressure sample circuit, adopts the principle of electric resistance partial pressure, 67 the 300K resistance (20.1M) of having connected, and in this device, voltage channel adopts two pins of V2P/V2N in ATT7026E.Chip sample voltage value scope is 0-1V,, sampled voltage 0.25V when external high pressure is 5000V, when external voltage is 1000V, sampled voltage is 0.05V, all in sample range.Multiple resistance of connecting, the one, consider that the temperature of resistance is floated impact, the 2nd, consider the dividing potential drop left and right of resistance, the resistance of selecting herein, below 15ppm, has been guaranteed measuring accuracy.
Fig. 3 computation chip ATT7026E unit, ATT7026E is high precision three-phase activereactive energy the special metering IC, the integrated Liao Liu of ATT7026E road second order sigma-delta ADC, the circuit such as the digital signal processing of reference voltage circuit and all power, energy, effective value, power factor and frequency measurement.Between ATT7026E and MCU, have 6 wiring, wherein 4 is SPI communication line interface CS, SCLK, DIN, DOUT, the reset control line of an ATT7026E, a handshake line SIG.ATT7026E provides a SPI interface, carries out the transmission of measuring parameter and calibration parameter between convenience and outside MCU.
The SPI read-write of ATT7026E own has very perfect verification means, but also more need to strengthen the antijamming capability of signal wire, therefore in design, SPI communication interface line should be shorter as much as possible, for the SPI signal transmission property-line around that is not interfered is wrapped.Receive the high frequency interference of signal for eliminating, the resistance of 10 Ω that can connect on SPI signal wire, and add a decoupling capacitor at signal input part, this can be similar to and form a low-pass filter, the choosing that decoupling capacitor can be suitable more greatly, to strengthen antijamming capability.In SPI interface, CS, SCLK, the crosstalk resistance of DIN institute and institute electric capacity will be tried one's best near ATT7026E chip, and the crosstalk resistance of DOUT end institute and institute electric capacity will be near MCU.
In the time powering on or ATT7026E is disturbed reset, must be upgraded calibration data by SPI mouth by outside MCU, to ensure the accuracy of metering, SIG signal is exactly a handshake for notifying outside MCU, and therefore MCU must monitor SIG signal.For make power on and reset after ATT7026E can synchronize with MCU and carry out SPI operation, its reseting procedure must keep RESET signal to be greater than 20us low level, chip reset, now SIG output high level, then MCU draws high RESET signal, approximately 500us, ATT7026E completes initialization, SIG output low level signal, can carry out SPI operation after this process, all should access the decoupling capacitor of 0.1uF for strengthening antijamming capability in the SIG input port of RESET port and MCU.
Fig. 4 is MCU unit MSP430F5438, as kernel control chip, MSP430 series monolithic is 16 super low-power consumption microcontrollers that Texas Instruments (TI) releases, because it has the hybrid processor of reduced instruction set computer, so be referred to as hybrid processor.Have the following advantages:
(1) strong (2) fast operation of processing power, MSP430 series monolithic can, under the driving of 25MHZ crystal, be realized the instruction cycle of 40nS.The data width of 16 and multi-functional hardware multiplier, can realize some algorithm (as FFT etc.) of digital signal processing.(3) super low-power consumption, what the supply voltage of single-chip microcomputer adopted is 1.8V-3.6V voltage, thereby can make it move under the Clock of 1MHZ time, the minimum meeting of electric current of chip is in 165uA left and right, the lowest power consumption under RAM Holdover mode only has 0.1uA.(4) aboundresources in sheet, 256K flash memory, 16KRAM, 12 ADC, 4 USCI, 32 HW multipliers.
Fig. 5 is infrared communication unit, and infrared communication unit comprises 3 parts, and (one) is infrared receiver, and (two) are infrared transmitting element, and (three) are infrared wakeup unit.
For the needs of realizing the functions such as hand-held adjustment, system has been introduced infrared communication.Infrared communication is easily subject to restriction and the interference of environmental baseline simultaneously, and adopts the infrared transmitting tube of high transmit power or can greatly improve the antijamming capability of communication with the receiver of light filter.The design of this device selects high efficiency IR7393C as power valve, and integrated infrared remote receiver IRM3638L is as receiving tube.Wherein, the luminous power of IR7393C reaches 150mW, can effectively strengthen the antijamming capability of infrared communication; IRM3638L receiver is packaged as a whole photodiode, prime amplifier and detuner, has the effect that receives infrared signal, built-in signal amplification, 38kHZ filtering, wave test output.
Principle of work: original state/CVIR is high level, in the time having outside infrared signal to irradiate, the conducting of photodiode V8 receiving optical signals, the base stage of V10 is high level, V10 conducting, IR-R becomes low level, and now CPU control/CVIR pin is low level, open VI pin, VIR is for becoming high level.Receiving optical signals sends after modulation /demodulation.IR-T pin is controlled by CPU, produces the PWM of 38KHZ.
Fig. 6 liquid crystal display circuit, liquid crystal display is an independently module, is connected with mainboard in the mode of plug-in unit, lcd drive chip is selected BU97950, this chip is supported 35*8=280 section display driver, 2 line serial line interface SCA, SDA, built-in liquid crystal drive power circuit.
Fig. 7 storage unit, storage unit comprises (one) Serial E 2PROM (two) FLASH storer.Serial E 2PROM, as metering device have many data as electric current and voltage coefficient be variation maybe can revise by normal means, but can not rewrite because of the interference in system, more can not lose because of events such as power failures, therefore device must meet the storage of data, and Serial E 2PROM to be this install applicable device, this device use be serial EEPROM, memory capacity is 256Kbit, and it and MCU adopt I2C interface to carry out communication.As shown in Figure 7, A0A1A2 is address input pin to circuit, while using simultaneously, connects corresponding low and high level and can be used as sheet choosing for multi-disc AT24LC256, and the 7th pin WP is protection pin, the clock control end that SCL is read/write, and SDA is the data output/entrance of read-write.
FLASH storer, it is erasable that Flash storer is that one can be carried out electricity in system, the storer that after power down, information is not lost, it has the features such as low-power consumption, large capacity, erasable speed are fast, and this device employing AT45DB161D Flash storer, has 4096 pages, every page of 512 bytes, total volume is 16Mbit, and inner integrated two data buffer storage SPRAM, externally provide SPI interface.
Fig. 8 power circuit
When proving installation test, do not need externally fed, powered by battery, battery adopts the CR-P2 battery in power source, Wuhan, cell voltage is 6V, chip input voltage is provided by battery, use linear stabilized power supply chip RP130N501D herein, it is fast that chip has reaction velocity, output ripple is little, the low noise advantages that work produces, chip output voltage is 5V, proving installation is considered aspect low power dissipation design, the capacity 1500mAh of battery, when voltage-withstand test, start battery, after finishing, experiment closes battery, battery power consumption is approximately 8mA, approximately can do voltage-withstand test 10,000 times.
Fig. 9 clock circuit, real-time clock adopts the RX8025-T chip of EPSON company, and its feature is as follows:
, (1) DTCX of built-in high precision 32.768KHZ, (digital temperature compensation crystal oscillistor), (2) fast mode of support I2C bus functionality, (400K), (3) timing alarm function, (4) fixed cycle Interruption function, (5) time is upgraded interrupt function, (6) 32.768KHZ frequency output, (energy 0E function while having), (7) leap year automatic regulation function, (8) wide region interface voltage: 2.2V is to 5.5V, (9) time of wide region keeps voltage 1.8V to 5.5V, (10) low current power consumption: 0.8uA/3V.
Claims (9)
1. ac voltage withstanding proving installation, to sampling by voltage sample circuit from the voltage of voltage resistant instrument equipment, voltage after sampling is sent into measuring apparatus, and data are sent to hybrid processor by measuring apparatus, and described hybrid processor shows data on display unit; Described voltage sample circuit adopts the principle of electric resistance partial pressure, multiple resistance of having connected, ground connection after two resistance of most end are all in parallel with corresponding electric capacity;
Described voltage sample circuit is connected with the V2N/V2P voltage channel of measuring apparatus, utilize the complete differential input mode of measuring apparatus, high-voltage signal from voltage resistant instrument is become to the AC signal that amplitude is 0-1V by voltage sample circuit, send into measuring apparatus by voltage channel.
2. ac voltage withstanding proving installation as claimed in claim 1, is characterized in that, proving installation power on or measuring apparatus be disturbed reset time, calibration data are upgraded by SPI mouth by hybrid processor; SIG signal is a handshake for notifying hybrid processor, therefore hybrid processor is monitored SIG signal, for make power on and reset after measuring apparatus can synchronize with hybrid processor and carry out SPI operation, its reseting procedure keeps RESET signal to be greater than 20us low level, chip reset, now SIG output high level, then hybrid processor is drawn high RESET signal, and after setting-up time, measuring apparatus completes initialization, SIG output low level signal, then carries out SPI operation.
3. ac voltage withstanding proving installation as claimed in claim 1 or 2, is characterized in that, decoupling capacitor is all accessed in the RESET port of described measuring apparatus and the SIG input port of hybrid processor.
4. ac voltage withstanding proving installation as claimed in claim 1, is characterized in that, described hybrid processor is also connected with infrared communication unit, display unit, storage unit, clock circuit, keyboard and battery.
5. ac voltage withstanding proving installation as claimed in claim 1, is characterized in that, described measuring apparatus is by SPI interface and hybrid processor communication.
6. ac voltage withstanding proving installation as claimed in claim 4, is characterized in that, described storage unit comprises storage chip AT24LC256 and Flash storer AT45DB161D, for data are stored.
7. ac voltage withstanding proving installation as claimed in claim 4, is characterized in that, described infrared communication unit comprises infrared receiver, infrared transmitting element and infrared wakeup unit.
8. ac voltage withstanding proving installation as claimed in claim 7, it is characterized in that, described infrared communication unit original state/CVIR is high level, in the time having outside infrared signal to irradiate, the conducting of photodiode V8 receiving optical signals, the base stage of triode V10 is high level, triode V10 conducting, IR-R becomes low level, and now hybrid processor control/CVIR pin is low level, open receiving tube VI pin, VIR is for becoming high level, and receiving optical signals sends after modulation /demodulation, IR-T pin, by hybrid processor control, produces PWM.
9. ac voltage withstanding proving installation as claimed in claim 1, is characterized in that, the outside of described proving installation also comprises insulation crust.
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| CN201410377013.0A CN104181488A (en) | 2014-08-01 | 2014-08-01 | AC voltage-resistant testing apparatus |
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| CN201410377013.0A CN104181488A (en) | 2014-08-01 | 2014-08-01 | AC voltage-resistant testing apparatus |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104407211A (en) * | 2014-12-06 | 2015-03-11 | 宁波迦南电子有限公司 | Power consumption metering device |
| CN104578038A (en) * | 2015-01-30 | 2015-04-29 | 国家电网公司 | Real-time voltage monitoring and overvoltage protection device and method for communication chips |
| CN104577942A (en) * | 2015-01-30 | 2015-04-29 | 国家电网公司 | Monitoring device and monitoring method for real-time voltage of communication chip |
| CN108414922A (en) * | 2018-06-11 | 2018-08-17 | 南京尤尼泰信息科技有限公司 | A kind of test device suitable for plurality of specifications crystal oscillator |
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2014
- 2014-08-01 CN CN201410377013.0A patent/CN104181488A/en active Pending
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104407211A (en) * | 2014-12-06 | 2015-03-11 | 宁波迦南电子有限公司 | Power consumption metering device |
| CN104407211B (en) * | 2014-12-06 | 2017-02-08 | 宁波迦南智能电气股份有限公司 | Power consumption metering device |
| CN104578038A (en) * | 2015-01-30 | 2015-04-29 | 国家电网公司 | Real-time voltage monitoring and overvoltage protection device and method for communication chips |
| CN104577942A (en) * | 2015-01-30 | 2015-04-29 | 国家电网公司 | Monitoring device and monitoring method for real-time voltage of communication chip |
| CN104578038B (en) * | 2015-01-30 | 2018-01-02 | 国家电网公司 | Real-time voltage monitoring, over-pressure safety device and method for communication chip |
| CN108414922A (en) * | 2018-06-11 | 2018-08-17 | 南京尤尼泰信息科技有限公司 | A kind of test device suitable for plurality of specifications crystal oscillator |
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