77 results about "Negative potential" patented technology

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.

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.

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 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.

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 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.

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.

The invention discloses a negative power supply working level decision circuit, and relates to the technical field of electronic circuits. The level decision circuit for working of the negative power supply receives an enable signal through a signal receiving module and outputs a corresponding output logic level through a logic processing module according to the voltage of the enable signal, and the high level of the output logic level is zero potential; and the low level of the output logic level is negative potential. By implementing the level decision circuit for working of the negative power supply recorded by the embodiment of the invention, when the internal working voltage of the enable pin is negative voltage, the on and off of the circuit can be controlled under the two voltage conditions that the enable pin applies positive voltage and negative voltage at the same time.

The present invention suppresses the influence of secondary electrons on a beam trajectory while using an aperture substrate to detect a beam current. An electron beam lithography device according to the present invention comprises: an emission part which emits an electron beam; an aperture substrate in which an aperture that the electron beam passes through is formed and which partially blocks the electron beam; a deflector which deflects the electron beam that has passed through the aperture of the aperture substrate and which draws a pattern on a drawing target substrate by irradiating the drawing target substrate with the electron beam; a wire which is connected to the aperture substrate and through which current based on the electron beam having been partially blocked by the aperture substrate flows; a current detector which is connected to the wire and which detects the current; and a voltage dropping element which is connected in series to the wire that connects the aperture substrate and the current detector and which applies negative potential to the aperture substrate.

The invention discloses a battery voltage anomaly analysis method, device and equipment and a storage medium, and relates to the technical field of batteries. The method comprises the following steps: charging and discharging a preset battery to obtain positive electrode potential data and negative electrode potential data; time derivation is carried out according to the positive electrode potential data and the negative electrode potential data, and a positive electrode voltage change rate and a negative electrode voltage change rate are obtained; and analyzing a battery abnormal result according to the positive voltage change rate and the negative voltage change rate. Therefore, the positive potential data and the negative potential data are obtained and derived to obtain the positive voltage change rate and the negative voltage change rate, the reasons of the voltage abnormity are further checked according to the positive voltage change rate and the negative voltage change rate, the reasons of the positive electrode and the negative electrode are clarified, the method is simple, efficient and rapid, and the voltage abnormity analysis efficiency is improved. And meanwhile, irreversible damage to the battery is avoided.

The application provides a negative voltage sampling circuit and a battery protection circuit, wherein the negative voltage sampling circuit comprises a sampling voltage terminal D, a detection voltage terminal A receiving a detection voltage VM, a third switch W3 connected between a node B and the detection voltage terminal A, a second switch W2 connected between the node B and a ground terminal G, a capacitor C1 connected between the node B and the sampling voltage terminal D, and a first switch W1 connected between the sampling voltage terminal D and the ground terminal G. Compared with the prior art, the application realizes absolute value sampling of the negative voltage VM through a switched capacitor, and the negative voltage sampling circuit does not need to provide a positive reference voltage VREF, so that the circuit is simple to realize.

To provide a semiconductor device that operates as a diode without being affected by negative potential.SOLUTION: A semiconductor device 1 includes a P-type substrate 10 to which a ground potential is supplied, a first PN junction diode D1, a first P-type well 31, a first N-type well 21, and an N-type well 40 for circuit elements. The first P-type well 31 is provided with a first PN junction diode D1, and the cathode of the first PN junction diode D1 is connected via a wiring layer. The first N-type well 21 is provided in the P-type substrate 10, and the first P-type well 31 is provided with a first constant potential. The N-type well 40 for circuit elements is provided in the P-type substrate 10, and a negative potential lower than the ground potential is supplied.SELECTED DRAWING: Figure 1

Provided is an upper arm drive circuit (1) capable of preventing malfunction and suppressing an on-delay of an upper arm switching element (Q1) even when the output of a power conversion circuit (2) becomes a negative potential. An upper arm drive circuit (1) for driving an upper arm switching element (Q1) of a power conversion circuit (2) includes: a first switching element (SW1) connected between a gate of the upper arm switching element (Q1) and a reference potential terminal; a first diode (D1) connected between the gate and the source of the first switching element (SW1); a second diode (D2) connected between the reference potential terminal of the upper arm switching element (Q1) and the connection node (N); a second switching element (SW2) connected between the gate of the first switching element (SW1) and the connection node (N); a third diode (D3) connected to a reference potential (GND); and a first resistor (R1) connected between the third diode (D3) and the connection node (N).

This invention discloses an anode material for hydrogen production via water electrolysis, its preparation method, and its application, belonging to the field of water electrolysis hydrogen production technology. The preparation method includes the following steps: using a three-electrode system, with NiFe layered double hydroxide as the working electrode, Pt as the counter electrode, Hg / HgO as the reference electrode, and ammonium molybdate solution as the electrolyte, applying a constant negative potential to the working electrode, and performing electrochemical Mo doping to obtain the anode material for water electrolysis hydrogen production. The catalytic activity of the anode material for water electrolysis hydrogen production of this invention is significantly improved, while the Tafel slope is reduced, making it suitable for industrial-grade high current density water electrolysis.

A method for providing a plasma for plasma treatment of a surface of a substrate, includes providing a process chamber with a substrate in the process chamber; and providing a shielding electrode grid in the process chamber so that a Faraday cage is formed around the substrate, or the part of the substrate to be processed. The shielding electrode grid is electrically conductive and is connected to ground or to a negative potential with respect to ground. providing a plasma in the process chamber. A voltage is applied to the substrate. The shielding electrode grid extends above the surface of the substrate to be plasma treated at a distance of less than or equal to 10 mean free paths of the ions in the plasma. A corresponding device performs a method for providing a plasma for plasma treatment of a surface of a substrate.

Effectively modifies oil. [Solution] The oil reforming apparatus comprises: a negative electrode section inserted into the oil in the oil tank, having a negative electrode plate and to which a negative potential is supplied; a positive electrode section inserted into the oil, not in contact with the negative electrode section, having a positive electrode plate facing the negative electrode plate and to which a positive potential is supplied; an insulating spacer sandwiched between the negative electrode plate and the positive electrode plate, fixing the negative electrode plate and the positive electrode plate to face each other without contact, and setting the distance between the negative electrode plate and the positive electrode plate to a distance to which charge can move; and a first flow chamber formed between the negative electrode plate and the positive electrode plate through which the oil can flow.

The present invention provides an electron beam inspection device that can reduce the potential change of the positive electrode immediately after blanking is released. [Solution] The electron beam inspection apparatus includes an objective lens that images a primary electron beam onto a sample. A negative potential is applied to the sample. The objective lens has an electromagnetic lens that forms a magnetic field in the gap between the inner diameter end of the Wehnert electrode and the inner diameter end of the yoke, and has a Wehnert electrode positioned opposite the sample as viewed from the Wehnert electrode, to which a negative potential is applied, and a positive potential electrode positioned opposite the sample as viewed from the Wehnert electrode, to which a positive potential is applied, and a ground electrode positioned between the Wehnert electrode and the positive potential electrode to prevent backscattered electrons emitted from the sample from colliding with the positive potential electrode, and is electrically grounded.

The present invention provides a polishing pad and polishing apparatus that enable efficient cleaning of the polishing pad after polishing, when using a weakly acidic slurry that becomes negatively charged during polishing of the workpiece, by suppressing the re-adsorption of foreign matter onto the polished surface of the polishing layer. [Solution] According to one aspect of the present invention, a polishing pad 10 is provided, comprising a polishing layer 11, wherein the polishing layer 11 contains a resin 11B, the zeta potential A at the polishing surface 11A of the polishing layer 11 measured using an electrolyte with a pH of 5.0 is 0 mV or a positive zeta potential, and the zeta potential B at the polishing surface 11A of the polishing layer 11 measured using an electrolyte with a pH of 7.0 is a negative zeta potential.

The invention relates to an on-board electrical system arrangement (1) comprising: a high-voltage battery (2), a high-voltage electrical system (3), a low-voltage electrical system (6), a low-voltage power source (7), and a DC / DC converter (8). The high-voltage electrical system (3) and the high-voltage battery (2) are interconnected via main potential lines (HV+, HV-) with switching elements (S+, S-). A low-voltage side (LV) of the DC / DC converter (8) is connected to the low-voltage electrical system (6) and the low-voltage power source (7), and a negative potential connection line (AL-) of the DC / DC converter (8) is connected to a high-voltage side (HV) of the DC / DC converter (8) and to the high-voltage battery (2). According to the invention, a positive potential connection line (AL+) of the DC / DC converter (8), in which a disconnect switch (TS) is arranged, is connected to the high-voltage side (HV) of the DC / DC converter (8) and to the high-voltage battery (2), and a positive potential bypass line (BL+) to the switching element (S+) arranged in the positive potential main line (HV+), in which a pre-charge switch (VS+) is arranged, is connected between the high-voltage side (HV) of the DC / DC converter (8) and the disconnect switch (TS) to the positive potential connection line (AL+) and between the switching element (S+) arranged in the positive potential main line (HV+) and the high-voltage vehicle electrical system (3) to the positive potential main line (HV+).