117 results about "Negative potential" patented technology

The invention relates to the technical field of production devices of sponge titanium, and provides a reactor for protecting a barrel based on a sacrificial anode method and a use method of the reactor, a reactor flange is arranged at the top of the barrel, and the reactor flange is used for connecting different pipelines or equipment parts; the lifting lug is arranged at the lower end of the outer side of the barrel, one end of the external chain is connected with the lifting lug, and one end of the external chain far away from the barrel is grounded; the cathode of the low-voltage power supply is connected with the reactor flange through a first power line; the anode of the low-voltage power supply is connected with the auxiliary anode through a second power line; and the auxiliary anode is used for enabling external cathode current to flow from the anode to a protected body through the medium to form a current loop. By adopting a forced current and sacrificial anode dual protection mechanism, the damage of electrochemical corrosion to the titanium reactor shell can be effectively prevented, the forced current protection ensures that the reactor keeps a proper negative potential through an external low-voltage power supply, and the loss of electrons from the metal surface is reduced.

An electrical on-board power supply of a vehicle includes a traction battery, a charging connection for coupling to a DC charging station, a positive potential line, a negative potential line, reference potential line, and a voltage measuring device between the positive potential line and the reference potential line and / or between the negative potential line and the reference potential line. A DC converter is arranged in the positive potential line and / or in the negative potential line. An isolating element is arranged in the positive potential line and / or in the negative potential line. A processing unit is configured to evaluate the measured voltage(s) and to control opening of the respective isolating element. The processing unit is configured to cause the respective isolating element to open when the triggering criterion or one of the multiple or all of the triggering criteria is / are determined to occur.

The invention relates to a DC / DC converter (1) for charging a battery (4) in a boost mode, wherein the DC / DC converter (1) has a primary side (P) and a secondary side (S), wherein on the primary side (P) and on the secondary side (S) a capacitance (CX_P, CX_S) is electrically coupled between a respective positive potential (HV+1, HV+2) and a respective negative potential (HV-1, HV-2), wherein - the primary side (P) and the secondary side (S) each have at least two half-bridges (HB1, HB2, HB3, HB4), each with a high-side switch designed as a semiconductor switch (S1, S3, S5, S7, D) and a low-side switch designed as a semiconductor switch (S2, S4, S6, S8), - LC resonant circuits (2.1, 2.2) designed as series resonant circuits are arranged between center taps of the half-bridges (HB1, HB2) on the primary side (P) and center taps of the half-bridges (HB3, HB4) on the secondary side (S), wherein exactly one of the potentials (HV+1, HV-1) of the primary side (P) is galvanically connected to the opposite pole potential (HV-2, HV+2) of the secondary side (S), wherein the other potential (HV-1, HV+1) of the primary side (P) is galvanically connected to a same pole battery terminal of the battery (4).

An insulation monitor for a high-voltage onboard electrical system of a motor vehicle is provided. A respective Y-capacitor is arranged between the positive potential and the vehicle earth and between the negative potential and the vehicle earth. The insulation monitor has a current or voltage source, a voltmeter for measuring at least one of the potentials, and is configured to apply a negative current by the current source when the potential measured by the voltmeter exceeds a predefined upper value and to apply a positive current by the current source when the potential measured by the voltmeter falls below a predefined lower value. The current thus being limited to a maximum permissible contact current in the case of an insulation fault and it is possible to infer the magnitude of the insulation resistances using the voltage measured by the voltmeter and the recharging current that has been fed in.

The invention discloses a multi-nucleic acid probe rapid modification and multi-target detection device based on electric field regulation and control. An instrument main body in the device is integrated with an automatic liquid path system and a micro electrochemical workstation module, and is used for realizing programmable reagent and sample conveying and multi-channel electrochemical measurement. The detachable sensing chip is formed by bonding a microelectrode array chip and a micro-fluidic chip, and is switched through a PCB (Printed Circuit Board) to realize plug and play. According to the present invention, the positive suction-negative discharge strategy of the electric field is utilized, the preferred positive potential is applied to the target electrode to efficiently attract the probe, and the preferred negative potential is applied to the non-target electrode to inhibit the non-specific adsorption so as to achieve the spatial selective rapid fixation and the accurate density regulation and control of the multi-nucleic acid probe in the extremely short time; the device can be used for quantitatively detecting various body fluid disease markers in a plurality of urine samples at the same time in single operation, and an efficient, accurate and portable multi-marker comprehensive analysis solution is provided for early screening and instant diagnosis of tumors.

The invention relates to an electric drive system (1) for a vehicle, comprising two electric machines (3.1, 3.2), each electric machine having three stator windings (L1 to L6); a high-voltage battery (2); and two inverters (4.1, 4.2), each of which is designed to supply one of the electric machines (3.1, 3.2), wherein, in a boost mode, one of the inverters (4.1, 4.2) is designed as a boost stage for a negative high-voltage potential (HV-), and the other inverter (4.1, 4.2) can be operated as a boost stage for a positive high-voltage potential (HV-) for charging the high-voltage battery (2). Each inverter (4.1, 4.2) is designed as a three-level T-type inverter and has three half-bridges, each of which consists of a high-side switch (HS1 to HS6), designed as a semiconductor switch, and a low-side switch (LS1 to LS6), designed as a semiconductor switch, the center taps (M1 to M6) thereof being connected, in each case, to one of the stator windings (L1 to L6) and to a bidirectional switch (BDS1 to BDS6) composed of two semiconductor switches connected anti-serially to one another. A series circuit consisting of a first capacitor (C1, C3) and a second capacitor (C2, C4) is connected between a positive potential (P1+, P2+) and a negative potential (P1-, P2-) of each inverter (4.1, 4.2), the center tap (M) of said series circuit being connected to the bidirectional switches (BDS1 to BDS6) of the respective inverter (4.1, 4.2).

The invention relates to an electric drive system (1) for a vehicle, having two electric machines (3.1, 3.2) each having three stator windings (L1 to L6), a high-voltage battery (2) and two inverters (4.1, 4.2) for supplying one of the electric machines (3.1, 3.2) each, wherein in boost operation one of the inverters (4.1, 4.2) can be operated as a boost stage for a negative high-voltage potential (HV-) and the other inverter (4.1, 4.2) can be operated as a boost stage for a positive high-voltage potential (HV-) for charging the high-voltage battery (2), wherein the inverters (4.1, 4.2) are each designed as a three-level T-type inverter and each have three half-bridges, each of which is formed from a high-side switch (HS1 to HS6) designed as a semiconductor switch and a low-side switch (LS1 to LS6) designed as a semiconductor switch, to the center taps (M1 to M6) of which one of the stator windings (L1 to L6) and a bidirectional switch (BDS 1 to BDS 6) made up of two semiconductor switches connected anti-serially to one another are connected, wherein a series circuit comprising a first capacitor (C1, C3) and a second capacitor (C2, C4) is connected between a positive potential (P1+, P2+) and a negative potential (P1-, P2-) of each inverter (4.1, 4.2), to the center tap (M) of which the bidirectional switches (BDS1 to BDS6) of the respective inverter (4.1, 4.2) are connected.

A malfunction of an upper arm switching element, caused when an output of a power converter circuit assumes a negative potential and undershoots, is prevented. An upper arm driver circuit comprises: a first switching element SW1, which is connected between a gate and a reference potential terminal of an upper arm switching element Q1; a second switching element SW2, which has a drain that is connected to a gate of the first switching element SW1;and a potential control circuit 4, and the potential control circuit 4 performs a control to make a potential of a source of the second switching element SW2 to a first potential V1 at which the first switching element SW1 can be kept in an on state even if the second switching element SW2 is switched on due to a malfunction in a first period T1, during which at least the reference potential terminal of the upper arm switching element Q1 is a negative potential and causes an undershoot AND, and to make the potential of the source of the second switching element SW2 to a second potential V2 that is lower than the first potential V1 and at which the first switching element SW1 can be switched off when the second switching element SW2 is switched on in a subsequent second period T2.

The present invention provides a method for surface treatment of a resin sheet, which can generate functional groups on the bonding surface of the resin sheet without roughening the surface of the bonding surface, and can improve the adhesion of the film to the bonding surface in the film forming process. In the method for surface treatment of a resin sheet according to the present invention, before the film forming process of bonding a film to the surface of the resin sheet (3), a surface treatment process is performed on the bonding surface of the resin sheet (3) to which the film is to be bonded. An inert gas (10) is introduced into the vacuum chamber (1) provided with the electrode (2), the resin sheet (3) is set to the ground potential, and a negative potential is applied to the electrode (2) by a high-frequency power supply (6) that periodically applies a negative potential.

A capacitor roll of an intermediate circuit capacitor having a first metallization layer serving as a positive potential and a second metallization layer serving as a negative potential, and having at least one region serving as a return path for a common mode current, and an intermediate circuit capacitor having a common mode current derivation function are provided, the capacitor roll having a first metallization layer serving as a positive potential and a second metallization layer serving as a negative potential, the region comes from at least one of the metallization layers and is formed electrically isolated therefrom.

A drive device 1000 for an electric motor, comprising: an inverter 3 that drives a motor 4; a voltage divider circuit 2 serving as a neutral point potential detection unit that detects a neutral point potential of a stator winding of the motor 4; and a controller 1 that estimates a rotor position of the motor 4 based on the detected neutral point potential and controls the inverter 3 based on the estimation result. A ground potential of the controller 1 is set to the negative potential or the negative potential of a DC voltage supplied to the inverter 3. The voltage divider circuit 2 detects the neutral point potential with respect to the negative potential or the positive potential.The controller 1 estimates the rotor position based on a difference between a first star point potential detected during the ON / OFF operation of the inverter 3 and a first fixed reference potential (2 / 3)Emax, and based on a difference between a second star point potential detected during the ON / OFF operation and a second fixed reference potential (1 / 3)Emax.

A conducted electrical weapon (“CEW”) may launch electrodes toward a target to electrically couple to the target. A CEW may include a signal generator, one or more electrodes, and a selector circuit. The signal generator may include a first conductor and a second conductor, wherein the first conductor has a positive potential and the second conductor has a negative potential. The signal generator may be configured to provide a stimulus signal through the first conductor and the second conductor. The selector circuit may be in electrical series between the signal generator and the one or more electrodes. The selector circuit may be configured to selectively electrically couple an electrode from the one or more electrodes to the first conductor or the second conductor of the signal generator.

The present invention discloses a display panel and a display device, belonging to the field of display technology. The display panel includes a plurality of sub-pixels, and each sub-pixel includes a pixel circuit and a light-emitting element. The pixel circuit includes a first transistor, the first pole of the first transistor is connected to a first reference voltage signal terminal, and the second pole of the first transistor is electrically connected to the anode of the light-emitting element; during the light-emission holding stage of the sub-pixel, a negative potential signal or a ground potential signal is applied to the first reference voltage signal terminal; the color of the first sub-pixel among the plurality of sub-pixels is different from the color of the second sub-pixel; the width-to-length ratio N1 of the channel region of the first transistor in the first sub-pixel is greater than the width-to-length ratio N2 of the channel region of the first transistor in the second sub-pixel. The display device includes the above display panel. The present invention can avoid the situation of light leakage in some color sub-pixels when other color sub-pixels emit light, and can also avoid the color deviation phenomenon of light-emitting elements of different colors at low gray levels, which is beneficial to improving the display effect.

The application discloses an ultrasonic fingerprint identification circuit and a driving method and an identification device thereof, and relates to the technical field of fingerprint identification.The ultrasonic fingerprint identification circuit comprises a first signal end, a second signal end, a driving transistor, a first compensation module, a second compensation module, an ultrasonic module, a recovery module, an integration module, a capacitor, a voltage writing module and a current writing module.The first signal end is used for receiving a first signal; the second signal end is used for receiving a second signal; the driving transistor is used for generating a driving signal; the first compensation module and the second compensation module are used for detecting and self-compensating the deviation of the threshold voltage of the driving transistor; the ultrasonic module is used for emitting an ultrasonic signal or receiving a reflected ultrasonic signal; the recovery module is used for absorbing the negative potential waveform of the reflected ultrasonic signal; the integration module is used for transmitting the positive potential waveform of the reflected ultrasonic signal to a first node; the capacitor is used for maintaining the potential of the first node; the voltage writing module is used for writing the first signal output by the first signal end to the driving transistor; and the current writing module is used for writing the second signal to a third node.The embodiments provided by the application can eliminate the influence of the threshold voltage of the driving transistor on the fingerprint identification, and improve the accuracy of the fingerprint identification.

A method and apparatus for producing graphene are described herein. The method comprises maintaining a molten salt bath in a carbonaceous environment; immersing a copper cathode, an anode, and a reference electrode of an electrode system into the molten salt bath; and applying a negative potential to the cathode to form graphene at the cathode. The apparatus for producing graphene comprises a cell structure including a molten salt bath maintained in a carbonaceous environment and an electrode system including a copper cathode, an anode, and a reference electrode immersed in the molten salt bath, the electrode system being configured to provide a negative potential to the cathode to form graphene at the cathode.

To provide a method for forming a highly stable lithium-ion battery anode.SOLUTION: A method including a process for preparing a solution containing an Sn(II) salt and an Sb(III) salt in a non-aqueous solvent, a process for inserting a conductive metal substrate into the solution, a process for applying a potential to the conductive metal substrate at room temperature, which is more negative than -0.55 V vs. Ag / Ag+, for a sufficient time to form a thin film of SnSb thereon, and a process for heating the solution before the process for applying the potential is provided.SELECTED DRAWING: Figure 1D

The application discloses a method for preparing a single-atom catalyst based on a cathode corrosion phenomenon, and comprises the following steps: S1, constructing an electrochemical two-electrode or three-electrode system, wherein a metal nanoparticle is loaded on a working electrode; an electrolyte is an alkali or salt solution of an alkali metal; S2, adding a carrier powder; S3, applying a constant negative potential to the working electrode; S4, filtering the carrier powder material and cleaning and drying, so as to obtain a metal single-atom catalyst. The metal particles on the electrode surface are induced to undergo cathode corrosion by the constant negative potential, and the metal single atoms falling off can be captured by the carrier and anchored on a suitable site, so that the metal single-atom catalyst is prepared. The application does not involve harsh conditions such as high temperature and vacuum, has the advantages of simple operation, easy scale-up, low energy consumption and short time consumption, is suitable for the preparation of a single-atom electrocatalyst, provides a good pre-basic foundation for the application of the single-atom catalyst in the fields of water electrolysis and fuel cells, and is very suitable for popularization and application.

An electrotherapy device is used for connecting a power supply and an organism and comprises a driving module, a conversion module and two output modules, and the driving module is electrically connected with the power supply and converts electric power of the power supply into a driving signal; an input port of the conversion module is electrically connected with the driving module and receives the driving signal so as to convert the driving signal into a stimulation signal with positive and negative potential changes and output the stimulation signal from two output ends of the output port; each output module comprises a body, an electrode and a light-emitting module, each body is provided with an applying side, each electrode and each light-emitting module are arranged on each body, each electrode protrudes out of the applying side of each body, and light emitted by each light-emitting module irradiates the outside of the applying side of each body; each light-emitting module is electrically connected with each output end, and each electrode is electrically connected with each light-emitting module.

An electron detector (22) for an electron microscope (10), which generates a primary electron beam (16) to illuminate a sample (18), has a tubular section (32) with an internal volume (34). The primary electron beam (16) can pass through the internal volume (34) to illuminate the sample (18). The electron detector (22) has a detector element (26) located outside the tubular section (32) and configured to detect electrons moving from the sample (18) in a second direction (42) opposite to the direction of the primary electron beam (16). In the second direction (42) upstream of the detector element (26), a filter grating (28) is arranged, extending in a third direction (60) perpendicular to the beam direction of the electron beam (16).The electron detector (22) has an insulator (36) that electrically isolates the filter grid (28) and the tubular section (32) from each other, so that the filter grid (28) can be at a negative electrical potential relative to the housing (24). A plurality of electrodes (48, 50, 52) made of an electrically conductive material are arranged outside the tubular section (32) and are configured to generate a predominantly homogeneous electric field (56) between the filter grid (28) and the detector element (26). The electric field (56) has equipotential lines (66) that run predominantly parallel to the filter grid (28) in the third direction (60).The electrodes (48, 50, 52) are further configured to selectively distort the electric field (56) in the region of the insulator (36) such that the equipotential lines (66) in a defined area (68) between the filter grid (28) and the detector element (26) exhibit an inhomogeneous, predominantly downward slope. The defined area (68) extends from the filter grid (28) in the second direction (42) and from the tubular section (32) in the third direction (60).

An electrospinning system, method, and apparatus comprises a dual polarity high voltage power supply with much less power out for safe operation, a solution dispensing assembly held at high positive potential by the dual polarity power supply, a Corona discharge assembly held at high negative potential by the dual polarity power supply, and a drum collector held at ground potential wherein a solution is drawn from the solution dispensing assembly to the drum collector thereby forming a fiber mat.

This invention discloses a control method, apparatus, and device for an ANPC-type three-level inverter, including a three-level inverter circuit. The method includes: firstly, determining whether the inverter is switching from a first mode to a second mode; calculating the collector voltage value based on the DC bus voltage, the bridge arm current of the inverter circuit, a preset stray inductance, and a voltage safety margin; if the collector voltage value is less than or equal to a preset voltage value, and the first mode and the second mode meet a first preset condition, and the junction temperature of the outer transistor is greater than or equal to a first preset temperature, and / or the junction temperature of the clamping transistor connected to the outer transistor is greater than or equal to a second preset temperature, then the inner transistor is turned off and another clamping transistor is turned on; the first preset condition includes the first mode outputting a positive potential, the second mode outputting a zero potential, and the output current being greater than zero, or the first mode outputting a negative potential, the second mode outputting a zero potential, and the output current being less than zero. This method evens out the losses of transistors with higher junction temperatures to the inner transistor, preventing transistor damage.

This invention provides a method for improving the capacity of a polypyrrole electrode. The method includes the following steps: S1, using a polypyrrole electrode as the working electrode and forming a three-electrode system with a platinum electrode, a calomel electrode, and an electrolyte; S2, running an electrochemical activation program on the three-electrode system. This method is based on the fact that the polypyrrole electrode material completes the energy storage and release process through the insertion and extraction of ions in the electrolyte. It increases the number of ions that can be inserted into the polypyrrole molecular chain through a negative potential activation method, thereby improving its capacity. This activation process alters the structure of the polypyrrole molecular chain, giving it more ion doping sites, representing an improvement at the molecular chain level. This method can be used for pure polypyrrole electrodes and polypyrrole composite electrodes.

A method of operating a plasma process system (1), the invention relates to a plasma process system (1) comprising: a) a plasma process chamber (2) having plasma process chamber walls (3) connected to a potential, for example to ground, b) a HiPIMS power supply device (4) designed to supply high-voltage high-power pulses, c) an electrode (5) inside the plasma chamber (2) connected to the HiPIMS power supply device (4), the method of operating a plasma process system (1) comprises the following steps: i. A HiPIMS power supply device (4) supplies an electrode (5) with a high voltage pulse having a first potential, in particular a negative potential, with respect to a plasma process chamber wall (3) and disconnects within a pulse disconnect time (off); ii. Connecting the electrode to a second potential, in particular a positive potential, relative to the plasma process chamber wall (3), opposite the first potential, immediately prior to the high-voltage pulse having the first potential.

A sputtering gas containing a rare gas is introduced into a vacuum chamber 1 of a vacuum atmosphere, an electric power with a negative potential is supplied to a target 2, a positive potential is applied to the reflector plate 4, a plasma is generated, and subsequently the supply of the sputtering gas is stopped, then the target is sputtered while a self-holding discharge under low pressure of plasma is generated. A high-frequency bias power is supplied from a high-frequency power source 61 through an impedance matching device 62 to a stage 5 on which an object to be deposited is mounted. An electron matcher having at least one variable reactor to be electronically controlled is used as an impedance matching device, and a high-frequency bias power is intermittently supplied to the stage at a predetermined frequency.

The application discloses a glow cathode plasma source with a light transmission gap, belongs to the field of plasma discharge, and aims at solving the problem that the existing glow discharge equipment cannot realize optical monitoring. The glow cathode plasma source comprises a holding electrode, a quartz glass and a front end of an electron extraction electrode which is rotated and cut to have a hole for transporting plasma; the upper end of a cathode side wall surface is provided with a C-shaped gap, the upper end of a holding electrode side wall surface is provided with a first L-shaped gap, and the upper end of an electron extraction electrode side wall surface is provided with a second L-shaped gap; a working gas enters a chamber surrounded by the cathode through a gas inlet pipe; the cathode is provided with an external connecting post for applying a negative potential, the holding electrode is provided with an external connecting post for applying a positive high-voltage potential, and the working gas is broken down to generate plasma in a vacuum environment; and an optical monitor monitors the generated plasma through the C-shaped gap, the first L-shaped gap, the second L-shaped gap and the quartz glass. The application is used for a glow discharge plasma source.

The present invention discloses a method for eliminating the charge accumulation on electrodes. The charges continuously provided by a constant-current power supply are used to neutralize the opposite charges accumulated on the electrodes, ensuring the stability of the electrode potential. This method relates to an ion implanter and belongs to the field of semiconductor device manufacturing. The high-voltage power supply A (1) outputs a DC positive voltage and provides a positive potential to the electrode A (2) for accelerating the ion beam and enabling it to obtain energy. The high-voltage resistor A (4) forms a circuit. The electrons (7) provided by the constant-current power supply A (5) are used to neutralize the positive charges (6) accumulated on the electrode A, ensuring the stability of the potential on the electrode A. The high-voltage power supply B (8) outputs a DC negative voltage and provides a negative potential to the electrode B (9) for suppressing the divergence of electrons in the ion beam. The high-voltage resistor B (9) forms a circuit. The positive charges (13) provided by the constant-current power supply B (11) are used to neutralize the electrons (12) accumulated thereon, ensuring the stability of the potential on the electrode B.

A motor drive device (1) includes: a converter section (11) that converts input AC power into DC power to output to a DC link; a DC link capacitor (4); voltage dividing resistors (13-1, 13-2) that are connected in series to each other between a positive potential line and a negative potential line of the DC link; a measurement resistor (14) that is connected between a connection point of the voltage dividing resistors (13-1, 13-2) and the positive potential line or the negative potential line of the DC link; a resistor voltage measurement section (15) that measures a resistor voltage of the measurement resistor (14); a DC component extraction section (16) that extracts a DC component of the resistor voltage; an AC component extraction section (17) that extracts an AC component of the resistor voltage; a DC link potential measurement section (18) that measures the positive potential and the negative potential of the DC link; and an insulation resistance value calculation section (19) that calculates an insulation resistance value of a motor (3) based on the DC component and the AC component of the resistor voltage and the positive potential and the negative potential of the DC link.

The present application provides an ion beam blocking apparatus and a semiconductor process device. The ion beam blocking apparatus comprises an ion screening member and an ion collection member that are sequentially arranged along an ion movement direction and electrically insulated from each other; an enclosed space is formed between the ion screening member and the ion collection member, the ion screening member is provided with a plurality of screening holes for ions to pass through, and the screening holes are communicated with the enclosed space; and when a positive potential and a negative potential are applied to the ion screening member and the ion collection member respectively, an electric field formed in the enclosed space can guide ions to pass through the screening holes into the enclosed space and move toward the ion collection member.

An optoelectronic sensor and a method of forming the same, and an electronic device, the optoelectronic sensor comprising: a first opening through a dielectric layer over a pixel substrate and an interconnect layer of a lead region; a first pad layer at a bottom of the first opening and in contact with the interconnect layer; a passivation layer filling the first opening and on a first surface, covering the first pad layer and a conductive layer; a second opening in the passivation layer and exposing the first surface of the pixel substrate and a top surface of an isolation structure, the second opening being in a grid pattern; a metal layer filling the second opening and in contact with the conductive layer; and a second pad layer on the passivation layer of the first surface and connected to the metal layer. By applying a negative potential to the second pad layer, the conductive layer of the isolation structure is connected to the negative potential through the metal layer, which is conducive to adsorbing positive charges on the sidewall of the isolation structure, thereby improving the interface state of the sidewall of the isolation structure and reducing the dark current of the pixel unit.

In a method in which inside a vacuum chamber, a silicon target and a to-be-deposited object are disposed in a positional relationship to face each other; a sputtering gas, containing therein nitrogen gas, is introduced into the vacuum chamber which is in a vacuum atmosphere; a negative potential is applied to the silicon target such that a silicon nitride film having a tensile stress is deposited in a reactive sputtering on a surface of the to-be-deposited object that is placed in an electrically floated state. The method includes steps: in which the to-be-deposited object is made to a state in which a bias potential is free from being applied thereto; and at least one of a flow ratio of the nitrogen gas to the sputtering gas, and the potential to be applied to the silicon target is controlled such that the surface of the silicon target can be maintained in a transition mode.