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30results about How to "Reduce residual voltage" patented technology
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Electro-optic displays with reduced remnant voltage
ActiveUS20050179642A1Reduce the impactReduce impactStatic indicating devicesNon-linear opticsDisplay deviceEngineering
Owner:E INK CORPORATION
Electro-optic displays with reduced remnant voltage
ActiveUS8558783B2Reduce impactLow peak remnant voltageStatic indicating devicesNon-linear opticsDisplay deviceEngineering
Owner:E INK CORPORATION
Methods for driving electro-optic displays, and apparatus for use therein
InactiveUS20050219184A1Reduce residual voltageCathode-ray tube indicatorsNon-linear opticsGray levelDisplay device
A bistable electro-optic display has a plurality of pixels, each of which is capable of displaying at least three gray levels. The display is driven by a method comprising: storing a look-up table containing data representing the impulses necessary to convert an initial gray level to a final gray level; storing data representing at least an initial state of each pixel of the display; receiving an input signal representing a desired final state of at least one pixel of the display; and generating an output signal representing the impulse necessary to convert the initial state of said one pixel to the desired final state thereof, as determined from said look-up table. The invention also provides a method for reducing the remnant voltage of an electro-optic display.
Owner:E INK CORPORATION
Electro-optic display with controlled electrochemical reactions
ActiveUS20150015932A1Reduce residual voltageNon-linear opticsOptical elementsElectrochemical responseRedox
An electro-optic display has a viewing surface through which a user views the display, a bistable, non-electrochromic electro-optic medium, and at least one electrode arranged to apply an electric field to the electro-optic medium, the display. The display comprises at least 10 micromoles per square meter of the viewing surface of at least one redox compound having an oxidation potential more negative that about 150 mV with respect to a standard hydrogen electrode, as measured at pH 8.
Owner:E INK CORPORATION
Electrostatic dissipating polymeric multi-layer article or laminate
InactiveUS20030003302A1Improve protectionLower resistanceSynthetic resin layered productsLaminationPolymer scienceSurface resistivity
The present invention relates to a thermoplastic, multi-layer, electrostatic discharging, laminate comprised of at least one outer layer that is permanent static dissipative and non-contaminating, and a core or base layer that is conductive. The outer layer has a surface resistivity of from about 1.0x105 to about 1.0x1012 Ohm / sq, and the core layer has a surface resistivity of from about 1.0x101 to about 1.0x1011 Ohm / sq.
Owner:NOVEON INC
Electrostatic dissipating polymeric multi-layer article or laminate
InactiveUS6740410B2Great dissipative capacityReduce residual voltageSynthetic resin layered productsLaminationPolymer scienceSurface resistivity
The present invention relates to a thermoplastic, multi-layer, electrostatic discharging, laminate comprised of at least one outer layer that is permanent static dissipative and non-contaminating, and a core or base layer that is conductive. The outer layer has a surface resistivity of from about 1.0x10<5 >to about 1.0x10<12 >Ohm / sq, and the core layer has a surface resistivity of from about 1.0x10<1 >to about 1.0x10<11 >Ohm / sq.
Owner:NOVEON INC
Device for preventing sub-module capacitor overvoltage
InactiveCN104467393ASimple structureEasy to installAc-dc conversionEmergency protective arrangements for limiting excess voltage/currentCapacitanceOvervoltage
The invention discloses a device for preventing sub-module capacitor overvoltage. The device is applied to a flexible direct current transmission system composed of modularized multi-level converters. The device is formed by connecting at least one thyristor with at least one resistor in series, connected between an alternating current side bus of a converter valve and the ground in parallel, or between a direct current side bus and the ground, or installed in the two positions at the same time. The thyristors are triggered to be switched on, and the residual voltage on the alternating current side or the direct current side is prevented from sub-module capacitor overvoltage in the sub-module capacitor uncontrolled charging process. The installation number and the installation position of the devices can be determined according to engineering requirements, and which devices are determined to be triggered so as to be switched on according to different sub-module overvoltage prevention policies.
Owner:NR ELECTRIC CO LTD +1
Illuminating device and driving method thereof
ActiveCN101155448AAverage voltage dropAvoid drivingElectrical apparatusElectroluminescent light sourcesTransformerEffect light
The present invention relates to a lighting device and its driving method. The driving method separately drives a first luminous diode and a second luminous diode to light during a first period and a second period, the driving method comprises the following steps: in the first period, outputting a driving signal with a first responsibility period so as to drive the first luminous diode; and in the first period, outputting a driving signal with a second responsibility period so as to drive the first luminous diode, wherein the second responsibility period is less than the first responsibility period. The lighting device comprises: an electrical source supply circuit for outputting a voltage; a transformer with a once side and a twice side; a first lighting unit for electrical property connecting to the twice side of the transformer; a second lighting unit for electrical property connecting to the twice side of the transformer; and a transformer switch for electrical property connecting to the transformer.
Owner:BOE TECH GRP CO LTD
Buffer circuit suitable for hybrid high-voltage DC breaker bidirectional parallel load commutation switch
ActiveCN106655746AReduce residual voltageImprove quicknessPower conversion systemsCapacitorHigh voltage
The invention brings forward a buffer circuit structure suitable for a hybrid high-voltage DC breaker bidirectional parallel load commutation switch, and a control policy. The circuit structure comprises capacitors C1p and C1n, insulation gate bipolar transistors T1p and T1n, diodes D1p to D3n and resistors R1p to R2n, wherein the collector electrode and the emitter electrode of the T1p are connected with the cathode and the anode of the D1p; one end of the R1p is connected with the emitter electrode of the T1p, and the other end is connected with a node S2; one end of the C1p is connected with the collector electrode of the T1p, and the other end is connected with the node S2; the R2p and the D2p are connected in parallel; the anode and the cathode of the D2p are connected with the cathode of the D3p and the collector electrode of T1p; the anode of the D3p is connected with a node S1; and another same buffer circuit structure is reversely connected in series between the node S1 and the node S2. The control policy of the circuit comprises control over the T1p and the T1n when a hybrid high-voltage DC breaker is disconnected and connected. The structure and control are simple, and the quick acting property and reliability of the hybrid high-voltage DC breaker are improved.
Owner:SICHUAN UNIV
Surge protection circuit
InactiveUS20150222109A1Reduce residual voltageExtended service lifeMagnetic/electric field screeningElectroluminescent light sourcesElectromagnetic interferenceInductor
The present invention discloses a surge protection circuit. The surge protection circuit is formed by serially connecting a piezoresistor, a discharge tube and a differential mode (DM) inductor. The present invention fully utilizes characteristics of the DM inductor, effectively suppresses electromagnetic interference, and can also effectively avoid damage caused to a surge protection element by over-voltage and over-current shocks, reduce a residual voltage, and prolong the service life of a related electronic product.
Owner:TONLIER ENERGY TECHBEIJINGCO
Pulse frequency modulation type image sensor circuit and processing method of the same
ActiveCN107396009AReduce difficultyReduce complexityTelevision system detailsColor television detailsControl signalOpto electronic
The invention relates to the integrated circuit technology. The invention provides a pulse frequency modulation type image sensor circuit and a processing method of the same, solving the problem that a current PFM (Pulse Frequency Modulation) type image sensor is complicated in structure at the high precision moment. The technical scheme of the pulse frequency modulation type image sensor circuit is characterized in that the pulse frequency modulation type image sensor circuit includes a power supply input terminal, a photoelectric detector, an integral node capacitor, a comparator, a first integral node reset switch, a counter, a circuit output terminal, a ground wire, an external control signal input terminal, a second integral node reset switch, a group of gating control switches, a logic module and a group of fixed reference voltage input terminals. The pulse frequency modulation type image sensor circuit has the advantages of reducing difficulty and complexity of circuit design, and is suitable for a pulse frequency modulation type image sensor.
Owner:UNIV OF ELECTRONICS SCI & TECH OF CHINA
Discharge element with discharge-control electrode and the control circuit thereof
ActiveUS8227989B2Improve discharge performanceReduce residual voltageSpark gaps with auxillary triggeringControl electrodesLow voltageControl circuit
Owner:SURGELAB KOREA
Output voltage turning-off control method and circuit of vehicle-mounted sine wave inverter
ActiveCN103248212AMonitor real-time waveformsReduce residual voltagePower conversion systemsWave shapeControl circuit
The invention relates to an output voltage turning-off control method and a control circuit of a vehicle-mounted sine wave inverter, as well as the relevant vehicle-mounted sine wave inverter. The control method comprises the steps that when the vehicle-mounted sine wave inverter stops outputting, a real-time phase of output voltage is computed according to an SPWM (Sine Pulse Width Modulation) counting value; whether output voltage corresponding to the real-time phase is less than the preset voltage value is judged; if so, outputting of an SPWM wave is stopped immediately; if not, a waveform of the output voltage is further judged; if the waveform rises, the SPWM wave is output continuously after the SPWM pulse counting value is adjusted to allow the waveform of the output voltage to be changed from rising to dropping immediately; if the waveform drops, the SPWM wave is output continuously and normally; and the output voltage is monitored continuously whether the waveform rises or drops till the output voltage is less than the preset voltage value. According to the control method, the control circuit and the relevant vehicle-mounted sine wave inverter, the real-time waveform of the output voltage is monitored when the vehicle-mounted sine wave inverter stops the outputting, the output voltage is turned off by a zero voltage turning-off technology, and residual voltage at an output end is low after turning-off, so that the safety is good; no discharge resistor is required to be connected in parallel; and the product efficiency is improved.
Owner:DOMETIC SHENZHEN ELECTRONICS CO LTD
Circuit for preventing surge and electronic apparatus having the same
InactiveUS20190148936A1Reduce residual voltageReduce signalingEmergency protective arrangements for limiting excess voltage/currentEngineeringSurge voltage
A circuit for preventing surge and an electronic apparatus having the same are provided. The circuit for preventing surge is configured to serve as a surge discharging path of the signal path so as to protect the device body. The circuit for preventing surge includes first and second discharging circuits. The first discharging circuit is coupled between the signal path and a ground terminal. The first discharging circuit is turned on in response to a transient surge voltage on the signal path so as to discharge the transient surge voltage to be a first surge voltage. The second discharging circuit is connected to the first discharging circuit in parallel. When a voltage difference between the first surge voltage and a voltage of the ground terminal is greater than or equal to a threshold voltage, the second discharging circuit is turned on to discharge the first surge voltage.
Owner:PEGATRON
Rapid ionization device and preparation method thereof
ActiveCN112071898AIncrease the opening speedLimit area widthFinal product manufactureSemiconductor/solid-state device manufacturingDevice materialImpact ionization
The invention belongs to the field of pulse power semiconductor devices, and particularly relates to a rapid ionization device and a preparation method thereof. The rapid ionization device comprises ametallized cathode, a highly-doped n+ region, a cathode-side highly-doped p+ short-circuit point, a p base region, an n- base region, an n-type ionization promoting layer, an anode-side highly-dopedn+ short-circuit point, a highly-doped p+ region and a metallized anode which are adjacently arranged in sequence. According to the invention, the n-type ionization promoting layer with higher dopingconcentration than the n- base region is introduced into the FID device structure, and the expansion of the space charge region of the n- base region is limited, so that the width of the region to bepenetrated by the collision ionization front edge is limited, the penetration range of the collision ionization front edge is reduced, the propagation time of the collision ionization front edge is shortened, and the reliability of the device is improved, so the switching-on speed of the device is improved.
Owner:HUAZHONG UNIV OF SCI & TECH
Power supply circuit and power supply method
ActiveCN111917282AReduce residual voltageReduce total harmonicsEfficient power electronics conversionApparatus without intermediate ac conversionCapacitor voltageHemt circuits
According to a power supply circuit and a power supply method provided by the present invention, an input voltage charges a first capacitor, and the voltage of the first capacitor is a power supply; when the input voltage drops to a first threshold value, the first capacitor is charged; when the voltage of the first capacitor rises to a second threshold value, or when the input voltage rises to athird threshold value, the charging of the first capacitor is cut off; and the first threshold value is adjusted according to the input voltage when the charging of the first capacitor is cut off, oraccording to the capacitor voltage when the first capacitor begins to be charged, or according to the capacitor voltage when the charging of the first capacitor is cut off, so that the power supply circuit works in the highest efficiency state. According to the present invention, the power supply efficiency is high, and the circuit structure is simple.
Owner:JOULWATT TECH INC LTD
Antimony silicate-modified high gradient zinc oxide pressure sensitive material
InactiveCN101531506AImprove electrical performanceExcellent electrical parametersVaristorsHigh pressureVoltage gradient
The invention provides an antimony silicate-modified high gradient zinc oxide pressure sensitive material, which comprises the following components by weight percentage: 91 to 92 percent of ZnO, 2.65 to 2.80 percent of Bi2O3, 1.85 to 2.00 percent of Co2O3, 0.50 to 0.70 percent of MnO2, 0.40 to 0.60 percent of Cr2O3 and 2.55 to 3.00 percent of antimony silicate. A process flow for producing the antimony silicate-modified high gradient zinc oxide pressure sensitive material comprises the steps of material weighing, mixing and grinding, granulation, forming, sintering, electrode loading, lead wire welding, encapsulating, curing and testing, wherein the sintering temperature is 105 DEG C and the temperature is kept for 120 minutes. With the addition of a proper amount of antimony silicate and an optimized material mixing ratio, the zinc oxide pressure sensitive material achieves an obviously improved electric property, a plurality of excellent electric parameters and a high pressure sensitive voltage gradient. Thus, the zinc oxide pressure sensitive material meets the requirements on electric parameters of general pressure-sensitive devices and reduces raw materials at the same time. Compared with the prior general art, the zinc oxide pressure sensitive material can save 70 to 95 percent of raw materials.
Owner:SHANDONG UNIV
Illuminating device and driving method thereof
ActiveCN100579323CAvoid drivingAverage voltage dropElectrical apparatusElectroluminescent light sourcesTransformerEffect light
Owner:BOE TECH GRP CO LTD
Output voltage turning-off control method and circuit of vehicle-mounted sine wave inverter
ActiveCN103248212BMonitor real-time waveformsReduce residual voltagePower conversion systemsWave shapeEngineering
Owner:DOMETIC SHENZHEN ELECTRONICS CO LTD
Antimony Silicate Modified High Gradient Zinc Oxide Pressure Sensitive Material
InactiveCN101531506BImprove electrical performanceExcellent electrical parametersVaristorsSilicic acidHigh pressure
Owner:SHANDONG UNIV
Delayed avalanche semiconductor device for inhibiting fringe electric field
PendingCN114864659AReduce concentration differenceSuppression of electric field concentrationSemiconductor devicesDevice materialOhmic contact
The invention discloses a delayed avalanche semiconductor device for inhibiting a fringe electric field. The delayed avalanche semiconductor device comprises an N + type substrate, a cathode, a P-drift region, a P + active region, an anode, an oxide layer and a side electrode, the cathode, the N + type substrate and the P-drift region are sequentially arranged from bottom to top; the cathode is in ohmic contact with the interface of the N + type substrate; performing ion implantation on the P-drift region to form a P + active region; the anode is positioned above the P + active region and is in ohmic contact with an interface of the P + active region; oxide layers are arranged on the two sides of the anode respectively; side electrodes are arranged on the side surface of the P-drift region and the side surface of the N + type substrate; the interface between the side electrode and the P-drift region is Schottky contact; and the side electrode is interconnected with the cathode through metal. According to the invention, the P + active region is formed in the P-drift region through ion implantation, and the side electrode is deposited on the side surface of the P-drift region and extends to the whole N + type substrate, so that the device is prevented from being broken down in advance at the edge before avalanche, and the avalanche reliability of the device is improved.
Owner:XIDIAN UNIV
Three-phase capacitor with silicon controlled rectifier without phase sequence detection and synchronous non-delay switching control method
ActiveCN104466989BReduce residual voltageShorten discharge timeReactive power adjustment/elimination/compensationReactive power compensationCapacitanceSilicon-controlled rectifier
The invention provides a synchronous switching control method suitable for a three-phase capacitor provided with a silicon controlled rectifier and free of phase sequence detection or switching delay, and relates to the field of reactive compensation of a power system. The synchronous switching control method aims to solve the problems that after the silicon controlled rectifier is switched off, the residual voltage of the capacitor is too high, an operator must wait when secondary switching is conducted, and by the adoption of a traditional control method, the phase sequence of input voltage needs to be judged, so that design of software and hardware is complicated. The synchronous switching control method is simple and reliable, only one line voltage needs to be detected, a current zero crossing point and the phase sequence of the input voltage do not need to be detected, it is guaranteed that switching on and switching off are conducted at the current zero crossing point, the voltages at the two ends of a switch device are always below two times of peak voltage after the capacitor is switched off, so that when secondary switching is conducted, a voltage zero crossing point must exist at the two ends of the switching device, switching can be conducted without delay waiting, and the response speed of the system is increased. The synchronous switching control method is suitable for a three-phase compensation type capacitor reactive compensation device.
Owner:哈尔滨中创电气技术有限公司
Multiplier and power factor correction controller with same
ActiveCN101714204BLower baselineReduce residual voltageEfficient power electronics conversionEnergy industryTotal harmonic distortionHigh pressure
The invention discloses a multiplier and a power factor correction controller with the same. The multiplier comprises a first differential input level, a second differential input level and an output level, wherein the first differential input level is provided with an amplitude limiter circuit which limits the amplitude of input signals of the multiplier and comprises a first transistor Q1 and a thirteenth transistor Q13; the base of the first transistor Q1 is used as an input end for receiving input voltage signals of the multiplier; the base of the thirteenth transistor Q13 is offset at a direct current voltage Vth of a zero-temperature coefficient, namely, at an amplitude limiting voltage value; and the emitter and the collector of the first transistor Q1 are connected with the emitter and the collector of the thirteenth transistor Q13 respectively. According to the invention, the output of the multiplier with the amplitude limiter circuit is used as a reference voltage of a current sampling and comparing circuit, which can limit the amplitude of the input signals of the multiplier under the condition of not influencing the input signals of a chip and can effectively solve the problem of the total harmonic distortion of a system in high-voltage input.
Owner:BCD (SHANGHAI) MICRO ELECTRONICS LTD
A snubber circuit suitable for bidirectional parallel load commutation switch of hybrid high-voltage DC circuit breaker
ActiveCN106655746BReduce residual voltageImprove quicknessPower conversion systemsDc circuit breakerHigh pressure
The invention proposes a buffer circuit structure and a control strategy suitable for the bidirectional parallel load commutation switch of the hybrid high-voltage direct current circuit breaker. The circuit structure includes capacitors C1p and C1n, insulated gate bipolar transistors T1p and T1n, diodes D1p to D3n, and resistors R1p to R2n. The collector and emitter of T1p are connected to the cathode and anode of D1p respectively; one end of R1p is connected to the emitter of T1p, and the other end is connected to node S2; one end of C1p is connected to the collector of T1p, and the other end is connected to node S2; R2p is connected in parallel with D2p; the anode and cathode of D2p are connected to the cathode of D3p and the collector of T1 respectively; the anode of D3p is connected to node S1; another identical buffer circuit structure is connected in reverse series between nodes S1 and S2. The circuit control strategy includes the control of T1p and T1n when the hybrid HVDC circuit breaker is opened and closed. The invention is simple in structure and control, and improves the quickness and reliability of the hybrid high-voltage direct current circuit breaker.
Owner:SICHUAN UNIV
Control Method For Shortening Start Time Of Electric Vehicle
InactiveCN103909837AShorten start timeShorten the timeSpeed controllerElectric devicesStart timeElectrical battery
A control method for shortening a start time of an electric vehicle quickly removes electricity remaining in a system without adding a separate component. The control method includes comparing a DC-link voltage in an inverter for driving a driving motor with a first reference value in a state in which the connection between a main battery and a vehicle system is released; checking a remaining voltage in the vehicle system and comparing the checked remaining voltage with a second reference value, when the DC-link voltage in the inverter is no less than the first reference value; removing the remaining voltage by operating an electric load in the vehicle so as to consume remaining electricity in the vehicle system, when the remaining voltage is no less than the second reference value; and connecting the main battery to the vehicle system by turning on a pre-charge relay and a main relay.
Owner:HYUNDAI MOTOR CO LTD +1
Buffer circuit applicable to two-way series load commutation switch of hybrid high-voltage direct-current circuit breaker
ActiveCN106452035AImprove quicknessImprove reliabilityPower conversion systemsHigh-voltage direct currentCapacitor
The invention discloses a buffer circuit applicable to a two-way series load commutation switch of a hybrid high-voltage direct-current circuit breaker and a control strategy. The one-way buffer circuit structure comprises a capacitor C1, insulated gate bipolar transistors T1 and T2, diodes D1, D2 and D3 and resistors R1 an R2. The collector and the emitter of the T1 are connected with the negative pole and the positive pole of the D1 respectively. One end of the R1 is connected with the emitter of the T1, and the other end of the R1 is connected with S2. The collector and the emitter of the T2 are connected with the negative pole and the positive pole of the D2 respectively. One end of the R2 is connected with the emitter of the T2, and the other end of the R2 is connected with the collector of the T1. The negative pole and the positive pole of the D3 are connected with the collector of the T1 and the collector of the T2 respectively. One end of the C1 is connected with the collector T1, and the other end of the C1 is connected with a node S2. The circuit control strategy includes the step of controlling the T1 and the T2 when the hybrid high-voltage direct-current circuit breaker is switched off and on. The circuit breaker is simple in structure and easy to control, and improves quick operation performance and reliability of the hybrid high-voltage direct-current circuit breaker.
Owner:SICHUAN UNIV
A snubber circuit suitable for bidirectional series load commutation switch of hybrid HVDC circuit breaker
ActiveCN106452035BImprove quicknessImprove reliabilityPower conversion systemsDc circuit breakerSnubber
The invention proposes a snubber circuit structure and control strategy suitable for a bidirectional series load commutation switch of a hybrid high-voltage direct current circuit breaker. One of the unidirectional buffer circuit structures includes a capacitor C1, IGBTs T1, T2, diodes D1, D2, D3, and resistors R1, R2. The collector and emitter of T1 are respectively connected to the cathode and anode of D1; one end of R1 is connected to the emitter of T1, and the other end is connected to S2; the collector and emitter of T2 are respectively connected to the cathode and anode of D2; One end is connected to the collector of T2, and the other end is connected to the collector of T1; the cathode and anode of D3 are respectively connected to the collector of T1 and the emitter of T2; one end of C1 is connected to the collector of T1, and the other end is connected to node S2 connected. The circuit control strategy includes the control of T1 and T2 when the hybrid high-voltage direct current circuit breaker is opened and closed. The invention has simple structure and control, and improves the quickness and reliability of the hybrid high voltage direct current circuit breaker.
Owner:SICHUAN UNIV
Liquid crystal alignment agent and preparation method thereof, liquid crystal alignment film and preparation method thereof, liquid crystal cell
ActiveCN112778521BReduce surface resistanceReduce residual voltageLiquid crystal compositionsNon-linear opticsCrystallographyPhysical chemistry
The invention provides a liquid crystal alignment agent and a preparation method thereof, a liquid crystal alignment film and a preparation method thereof, and a liquid crystal cell, and relates to the field of liquid crystal alignment agents. In the present invention, by adding piperazine monomer to the liquid crystal alignment agent, the volume resistance and area resistance of the liquid crystal alignment agent material can be reduced, the ability of the alignment agent material to release residual charges can be effectively improved, and the reliability and stability of electronic products can be improved. . The liquid crystal cell using the liquid crystal aligning agent of the present invention has the advantages of high voltage retention rate, low residual voltage and the like.
Owner:SHENZHEN DALTON ELECTRONICS MATERIAL CO LTD
Copolymer, and liquid crystal alignment layer including cured product thereof
ActiveUS9684206B2Superior ability to control alignmentProvided with alignment propertyLiquid crystal compositionsNon-linear opticsPolymer scienceCopolymer
Provided is a liquid crystal alignment layer of which a constituent member is a polymer represented by the general formula (I).
Owner:DAINIPPON INK & CHEM INC
An oil metal particle detection device
ActiveCN108415089BReduce residual voltageRealize real-time automatic compensationMaterial analysis by electric/magnetic meansElectric/magnetic detectionCapacitanceMetal particle
The invention discloses an oil metal particle detection device comprising a detection unit and a first compensation unit. The detection unit comprises an excitation signal source, a detection coil, two excitation coils and a resonant matching capacitor. The excitation signal source is connected with the two excitation coils and the first compensation unit so as to provide excitation voltage to thetwo excitation coils and the first compensation unit. The two excitation coils are arranged on the two sides of the detection coil and have opposite winding directions. The detection coil is connected with the first compensation unit through the resonant matching capacitor and wound on the oil pipeline so that the metal particles can be detected according to the output voltage of the detection coil when the oil penetrates through the detection oil. The first compensation unit is suitable for receiving the excitation voltage from the excitation signal source and outputting the first compensation voltage so as to counteract the residual voltage of the detection coil.
Owner:ANHUI RONDS SCI & TECH INC CO
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