150 results about "Negative potential" patented technology

The invention provides a battery heating control method and device, equipment, a storage medium and a program product, and relates to the technical field of battery heating. The method comprises the steps that when the vehicle meets the pulse heating condition, the saturation current of a motor for adjusting the battery temperature is determined based on the maximum negative electrode potential of a battery cell in a battery; determining the maximum pulse heating current of the motor based on the maximum current and the saturation current borne by the bus of the motor; and performing pulse heating on the battery based on the maximum pulse heating current. By considering the influence of the cathode potential, the cathode potential of the battery cell is kept in a safe range in the pulse heating process, and the risk of lithium precipitation of the battery cell is effectively reduced, so that the safety of the battery is improved, and the service life of the battery is prolonged; besides, the saturation current of the motor is determined based on the maximum cathode potential, and the maximum pulse heating current of the motor is further determined, so that the heating rate of the battery can be maximized on the premise of ensuring the safety of the battery, and the performance of the battery in a low-temperature environment is improved.

The invention provides a GaN HEMT (High Electron Mobility Transistor) with strong non-clamping inductive switching capability in an irradiation scene and a preparation method thereof, and belongs to the technical field of semiconductors. Comprising a substrate layer, a gallium nitride layer, a passivation layer, a channel layer, a barrier layer and an electrode structure layer, the electrode structure layer comprises a grid electrode structure, a source electrode structure and a drain electrode structure, the source electrode structure and the drain electrode structure are arranged on the two sides of the grid electrode structure, the grid electrode structure is in a strip shape and arranged above the barrier layer in the first direction, and the source electrode structure and the drain electrode structure are connected with the channel layer; a plurality of rectangular P-type gallium nitride layers arranged in groups are arranged between the grid electrode structure and the drain electrode structure, the plurality of rectangular P-type gallium nitride layers arranged in groups are uniformly arranged at intervals along a first direction and are connected through a metal wire, the top of the metal wire is connected with a negative potential electrode, and an area between the potential barrier layer and the negative potential electrode is filled with a dielectric layer. The technical problems that the normal switching capability of a device is affected and the overvoltage robustness is degraded due to hole accumulation after irradiation of a traditional HEMT can be solved.

The invention provides a packaging substrate and a manufacturing method thereof, an electric driving system and a vehicle. The packaging substrate comprises a transmission layer group, a power chip embedded in the transmission layer group, a first circuit layer, a second circuit layer, a top layer and a power supply negative electrode layer, the transmission layer group is provided with a first surface and a second surface which are oppositely arranged along the stacking direction of the packaging substrate, the first circuit layer is stacked on the first surface, and the second circuit layer is stacked on the second surface; a first potential transmission part and a negative potential part are arranged on the first circuit layer, and a second potential transmission part and a positive potential part are arranged on the second circuit layer; the power supply cathode layer is laminated on one side of the first circuit layer away from the first surface and is connected to the cathode potential part. The top layer is laminated on the power supply cathode layer.

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 provides an ion beam blocking device and semiconductor process equipment. The ion beam blocking device comprises an ion screening piece and an ion collecting piece which are sequentially arranged in the ion movement direction and electrically insulated from each other. A closed space is formed between the ion screening piece and the ion collecting piece, the ion screening piece is provided with a plurality of screening holes for ions to pass through, and the screening holes are communicated with the closed space; under the condition that positive potential and negative potential are applied to the ion screening piece and the ion collecting piece respectively, an electric field formed in the closed space can guide ions to penetrate through the screening holes to enter the closed space and move towards the ion collecting piece.

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).

The invention discloses an electroreduction method of hexavalent chromium and application of the electroreduction method, and belongs to the technical field of electrochemistry. The electroreduction method of the hexavalent chromium comprises the following steps: taking an active electrode as a working electrode, and carrying out electroreduction on the hexavalent chromium under an alternating voltage condition, the preparation raw materials of the active electrode comprise a hexavalent chromium adsorption material; the alternating voltage condition is that the positive potential and the negative potential are periodically converted. The hexavalent chromium adsorption material can adsorb hexavalent chromium, the hexavalent chromium adsorption material is prepared into the working electrode, and the hexavalent chromium is electrically reduced under the alternating voltage condition, so that the method has the advantages of high treatment rate and high treatment capacity, the hexavalent chromium can be effectively reduced into trivalent chromium, the removal rate of the hexavalent chromium is high, and the method is suitable for industrial production. The method provided by the invention has a good application prospect in chromium-containing wastewater treatment.

A method for detecting an insulation fault in a vehicle on-board electrical system having an HV and LV on-board electrical system branches. The LV branch has at least one first LV potential and a second LV potential that differs therefrom and corresponds to a ground potential of the vehicle on-board electrical system. The HV branch has positive HV negative HV potentials. These HV potentials are DC-isolated from the LV branch potentials. An insulation fault between at least one of the HV potentials and the first LV potential is detected by identifying a current flow. The current flow runs through a voltage limiting circuit connected between the ground potential and the first LV potential. This circuit connects the first LV potential, via a plurality of diodes, to a voltage limiting element connected to the ground potential of the vehicle on-board electrical system. A vehicle overvoltage protective circuit is also described.

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.

A magnetic field sensing device fabricated via an integrated circuit fabrication process, incorporates a planar electron gun. The device has an evacuated chamber in which electrons emitted by cold field emission may travel on a long mean free path, with minimal collisions with atoms, ions or other obstructions. The device also has a glass or plastic window over the evacuated chamber, allowing the entry of magnetic fields, but not of air or contaminants. The device also has two or more anodes, to which nominally the same potential is applied, causing the electrons to drift or accelerate from the cathode to strike the anodes, with the number of electrons arriving at each anode being modulated by the Lorentz Force resulting from the magnetic field entering the chamber. The device also has an integrated voltage multiplier to provide a large negative potential to the cathode.

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.

The present invention provides a planar photoionization detector and a planar photoionization detector sensor, the planar photoionization detector comprising: a gas discharge lamp that ionizes a molecule of interest to produce ionized molecules and electrons; and a sensor having at least one opening for passage of UV light, and a conductive pattern on at least one of a top surface and a bottom surface of the plate, the conductive pattern including at least a negative potential pattern and a collector pattern. The ionized molecules may be collected by a bias electrode and electrons may be collected by a collector. The negative potential pattern includes a linear portion and a polarizing plate. The collector pattern includes a conductive line suspended across the at least one opening and a linear portion located on a surface opposite the conductive line. The conductive pattern may further include a ground potential conductive pattern having a first portion on the top surface and a second portion on the bottom surface.

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.