595 results about "Negative power" patented technology

The invention belongs to the technical field of semiconductors, and discloses a SiC power semiconductor module with low parasitic parameters and a preparation method. Comprising a SiC power semiconductor chip, a SiC power semiconductor chip substrate cushion block, a positive electrode power terminal, a negative electrode power terminal, an output power terminal, a positive electrode side middle layer cushion block, a positive electrode side ceramic decoupling capacitor, a positive electrode side substrate middle layer cushion block, a negative electrode side middle layer cushion block, a negative electrode side ceramic decoupling capacitor and a negative electrode side substrate middle layer cushion block. A first copper-clad ceramic substrate, a third copper-clad ceramic substrate, a fourth copper-clad ceramic substrate, a second copper-clad ceramic substrate, a first commutation loop middle copper layer and a second commutation loop middle copper layer; according to the invention, a commutation path is provided for the SiC power semiconductor device by using the middle layer copper of the laminated copper-clad ceramic substrate, the concept of mutual inductance offset of double commutation loops is innovatively introduced, and the parasitic inductance of the module is further reduced.

A battery pack including a housing and a switching circuit. The housing supports a battery cell. The housing includes an interface for an electronic device. The interface includes a first positive power terminal and a second positive power terminal connected to the battery cell. A first negative power terminal and a second negative power terminal are connected the battery cell. The switching circuit operable to control the interface into a first configuration where power from the battery cell is only transferred from the battery cell to the electronic device using the first positive power terminal and the first negative power terminal, and control the interface into a second configuration where power from the battery cell is transferred from the battery cell to the electronic device using the first positive power terminal, the second positive power terminal, the first negative power terminal, and the second negative power terminal.

The embodiment of the invention provides a lens, a display module, a vehicle lamp device, electronic equipment and a vehicle. The lens comprises at least five lenses arranged from the image side to the object side in the optical axis direction. At least three lenses in the at least five lenses have positive focal power, at least one lens has negative focal power, and when the number of the lenses with the negative focal power in the lens is one, the lens with the negative focal power in the lens is arranged between the lens closest to the image side in the lens and the lens closest to the object side in the lens in the optical axis direction. The lens provided by the embodiment of the invention can have the characteristics of a large aperture and a large field angle at the same time, so as to meet the use requirements.

The present disclosure relates to a sensor controller including transmission drivers each having a negative and a positive power supply terminal, each of the transmission drivers being configured to generate a signal waveform transitioning between first potential and second potential and output the signal waveform to a corresponding detection electrode, and an intermediate potential supply unit having a potential generation circuit that includes a voltage source or a capacitive element separate from the transmission drivers, the intermediate potential supply unit being configured to output a voltage from the potential generation circuit at first timings at which a potential of a signal waveform starts to transition from the first potential to the second potential or from the second potential to the first potential, to supply the intermediate potential between the first potential and the second potential to at least one of the positive or the negative power supply terminal.

A driveline and driveline system for an active implantable device provides for communication over the power conductors in the driveline. The driveline includes four conductors, two for the positive power connection and two for the negative power connection. Communication in the driveline is performed using Power Line Communication (PLC) technology on the four conductors, superimposing a communication signal on the conductors such that the four conductors provide both power and communication capability. The four conductors provide redundant paths for both power and communication, so the failure of one of the conductors in the driveline does not affect operation of the driveline. The four conductor driveline cable and system provides a more robust driveline cable that does not fail with the failure of one of the conductors without increasing the diameter of the driveline, which would increase the risk of infection where the driveline passes through the skin.

The present invention relates to the field of ultrasonic cleaning. The present invention discloses an ultrasonic cleaning machine, comprising: a power supply assembly, the power supply assembly includes a bottom box, a positive power supply column, and a negative power supply column; a cleaning assembly, the cleaning assembly includes a chamber body, a power supply board, and an ultrasonic transducer. A cleaning groove is provided on the chamber body. The power supply board supplies power to the ultrasonic transducer. A positive contact piece and a negative contact piece are provided on the power supply board. The power supply board abuts against the bottom wall of the chamber body. The positive power supply column passes through the avoidance through hole and abuts against the positive contact piece, and the negative power supply column passes through the avoidance through hole and abuts against the negative contact piece; a connection assembly, the connection assembly includes a first magnet provided on the chamber body and a second magnet provided on the bottom box. The ultrasonic cleaning machine well improves the poor vibration transmission caused by poor assembly after replacement by the user. In addition, the connection between the cleaning assembly and the power supply assembly is ensured to be reliable and convenient.

The invention is applicable to the technical field of signal detection, and particularly relates to a high-frequency active differential signal probe and a control method thereof, a high-performance active differential probe is realized by using a high-performance operational amplifier, combining a low-ripple positive and negative power supply and combining a full-shielding shell through optimizing a circuit structure and using fewer devices; differential measurement of signals is realized, a low-cost differential probe is realized, and a signal measurement threshold is greatly reduced; the method has significance in promoting technical progress, has high measurement performance, and can meet most measurement requirements.

The ultralow frequency sensor comprises a vibration detection unit, a power supply voltage stabilization unit and a signal conditioning unit, the power supply voltage stabilization unit is provided with a low dropout linear voltage regulator U20, a voltage converter U19 and a negative voltage regulator U21, and the low dropout linear voltage regulator U20 stabilizes an external power supply as a positive power supply VCC; the voltage converter U19 is used for converting positive voltage of an external power supply into negative voltage and outputting stable negative power supply VEE through the negative voltage stabilizer; the positive power supply VCC and the negative power supply VEE supply power to the signal conditioning unit; the signal conditioning unit comprises a high common mode rejection differential amplifier, a differential-to-single-ended amplifier, a band-pass filter and a differential output driver, a differential signal output by the vibration detection unit sequentially passes through the high common mode rejection differential amplifier, the differential-to-single-ended amplifier, the band-pass filter and the differential output driver, and then a differential voltage signal is output; the method has the advantages of high stability and reliability and the like.

The invention discloses an insulation detection circuit, method and device which can be used in the field of electronic circuits, the insulation detection circuit comprises a first switch, a second switch and a sampling branch, and the sampling branch comprises a divider resistor, a sampling resistor and a third switch; the sampling branch is connected with a positive power line through a first switch and connected with a negative power line through a second switch. The sampling branch is provided with a first part connected with the first earth impedance in parallel and a second part connected with the second earth impedance in parallel, the first part comprises at least one divider resistor and a sampling resistor, and the second part comprises at least one divider resistor; the third switch is connected in parallel with at least one divider resistor. Therefore, the sampling branch is connected only under the condition of insulation detection, the number of electronic components is small, the circuit structure is simpler, the size of insulation detection equipment can be effectively reduced, and the circuit cost is reduced.

A connection unit according to the invention for a drive system comprises a cuboid-shaped housing in which a positive conductor, having a positive input terminal and a positive output terminal, a negative conductor, having a negative input terminal and a negative output terminal, and an earth conductor, having an earth input terminal and an earth output terminal, are arranged; an outer insulating body for receiving a positive busbar and a negative busbar; and a mounting plate for attaching the housing to a mounting plate in a control cabinet. The outer insulating body is arranged on a front wall of the housing, and the mounting plate is arranged on a rear wall of the housing opposite the front wall.A drive system according to the invention comprises an electrical intermediate circuit to which a DC voltage is applied, at least one axis module which generates an AC voltage for an electric motor from the DC voltage of the intermediate circuit, and at least one connection unit according to the invention. The positive input terminal and the negative input terminal of the connection unit are connected to the intermediate circuit. The intermediate circuits of several rows of the drive system according to the invention in a control cabinet are electrically interconnectable.

The invention belongs to the field of power device driving, particularly relates to the technical field of crosstalk suppression, and more particularly relates to a crosstalk suppression driving circuit. Through cooperative work of the driving module, the detection module, the buffering module and the clamping module, crosstalk is effectively suppressed while the switching speed is ensured. The driving module ensures normal switching action of the power device; the detection module converts the drain voltage change rate into a detection signal in real time, and recognizes the crosstalk risk in advance; the buffer module suppresses forward crosstalk by absorbing grid forward voltage spikes; the clamping module immediately conducts a low-impedance path from the grid electrode to the negative power supply when the detection signal exceeds a threshold value, and negative crosstalk is quickly eliminated. According to the design, the suppression circuit is only activated when the voltage change rate exceeds the standard, switching delay caused by a traditional fixed buffer circuit is avoided, accurate and rapid crosstalk suppression can be achieved, and finally the suppression effect and the system reliability are remarkably improved while the high-speed switching performance is maintained.

The invention belongs to the technical field of integrated circuits, and particularly discloses a numerical control programmable gain amplifier chip, which adopts an SIP (Session Initiation Protocol) packaged operational amplifier, a digital potentiometer, an input end Vin and an output end Vout, and is characterized in that an alternating current signal is input from the Vin end and is connected to an inverted input end of the operational amplifier through a capacitor C1 and an input resistor R1; a positive power supply pin of the operational amplifier is connected with a power supply positive electrode VDD, a negative power supply pin is grounded, and a VDD / 2 direct current bias voltage is obtained by an in-phase input end through a precision resistance voltage dividing network and is accessed after low-pass filtering; the high end of the digital potentiometer is connected with the Vout end, the low end is connected with the inverting input end of the operational amplifier, and a feedback path is formed through a sliding end. The digital potentiometer and the operational amplifier are integrated, high integration and modularization of the programmable gain amplification circuit are achieved, and the problems that in a traditional discrete scheme, due to analog switch conduction resistance, gain precision is insufficient, reliability of a multi-element system is lowered, and the circuit size is large are solved.

The invention relates to the technical field of friction power generation, in particular to an energy collection and vibration sensing device and system for a transmission line, which comprises a shell, a vibration sensor arranged in an inner cavity of the shell, and energy collectors arranged at the upper end and the lower end of the vibration sensor respectively. The vibration sensor comprises a balancing weight, and elastic pieces are arranged between the upper end and the lower end of the balancing weight and the adjacent energy collectors respectively. A positive friction piece is installed on the outer ring of the balancing weight, and a negative friction piece is installed on the inner wall of the shell. The positive friction piece can move up and down along with the balancing weight and make contact with the negative friction piece so as to generate electric signals. The energy collector comprises a positive electrode power generation membrane group and a negative electrode power generation membrane group which are oppositely arranged up and down and can make contact with each other and achieve friction power generation, one of the positive electrode power generation membrane group and the negative electrode power generation membrane group abuts against the shell, and the other abuts against the end, away from the balancing weight, of the elastic piece.

The invention provides a high-integration-level signal reading module for a neutron proportional counter tube, and belongs to the technical field of neutron detection, the high-integration-level signal reading module comprises stacked double-layer circuit boards, and the upper circuit board and the lower circuit board are connected through pin interfaces; the upper circuit board is provided with a signal processing circuit which is used for reading, amplifying, discriminating and shaping signals of the neutron proportional counter tube. The lower-layer circuit board is provided with a positive and negative dual-power-supply support circuit which provides + / -3.3 V power supply support for the signal processing circuit of the upper-layer circuit board. The module supplies power through the lower-layer power panel, and the lower-layer circuit board supplies positive and negative power to the upper-layer circuit board after completing power conversion. Signals are input through the IPX interface of the upper-layer circuit board and are output through the other IPX interface after being processed. The charge sensitive pre-amplifier, the broadband voltage amplifier, the pulse discriminator circuit, the pulse shaping circuit and the power management module are integrated in the same module, so that the real integrated design is realized.

The invention discloses a passive multi-stage voltage soft turn-off circuit suitable for SiC MOSFETs. The passive multi-stage voltage soft turn-off circuit comprises a driving main branch, a plurality of voltage reduction branches, a driving resistor, a discharging resistor and a driving power supply circuit. The driving power supply circuit is powered by a positive power supply VCC when the SiC MOSFET is turned on, and is powered by a negative power supply VEE when the SiC MOSFET is turned off. The voltage reduction branches are connected to the two ends of the driving main branch in parallel. The step-down branch comprises a step-down delay unit, a step-down action unit and a step-down unit which are sequentially connected in series; the delay time of each step-down branch is increased in sequence, and the step-down voltage drop is increased in sequence. According to the invention, the voltage level can be conveniently controlled by changing the number of the voltage reduction branches, an additional power supply module does not need to be added, the voltage reduction time can be controlled by the voltage reduction delay branches, the degree of freedom of driving is greatly increased, and the circuit is low in complexity, high in voltage reduction degree of freedom and high in reliability.

The invention discloses a general constant current source adapter based on a single power supply-positive and negative symmetric power supply converter, which is characterized in that a voltage follower based on an operational amplifier can convert single power supply into positive and negative symmetric dual power supply, and output voltage of the operational amplifier A1 is subjected to power amplification through a complementary push-pull circuit to form a positive and negative symmetric power supply with relatively high power; the in-phase proportion operation circuit based on the operational amplifier can amplify the reverse constant current source control voltage and the forward constant current source control voltage, and the amplified control voltages respectively drive corresponding transistors of the complementary push-pull amplification circuit to be switched on. A positive power supply and a negative power supply of the positive and negative symmetrical dual power supplies respectively provide voltage sources for the constant current range switching circuit through the correspondingly conducted transistors, and the current passing through the constant current range switching circuit is equal to the current passing through the load RL. Through switching of the switch S1, the reverse constant current source control voltage and the forward constant current source control voltage can change the current direction passing through the load RL.

The utility model provides a vehicle end diode detection circuit, which comprises a standby controller and a detection circuit, the equipment controller comprises a U1A, a positive power interface of the U1A is connected with + 12V voltage, a negative power interface of the U1A is connected with-12V voltage, an inverted input end of the U1A is connected with a resistor R2, the other end of the resistor R2 is connected with 3.3 V voltage, the inverted input end of the U1A is connected with a resistor R1, the other end of the resistor R1 is grounded, and the detection circuit is connected with the standby controller. And the voltage is 3.3 V, the R2 and the R1 provide reference voltage for the U1A, and the normal phase input end of the U1A is connected with a resistor R3. The arrangement of the equipment controller and the detection circuit is beneficial to detecting whether the vehicle end diode D1 of the electric vehicle exists or not.

The invention discloses an optical module, which comprises a circuit board provided with a base mounting part, and a base covering part of the base mounting part. The base is arranged on the lower surface of the circuit board. The upper surface of the bearing platform of the base protrudes to form a protruding part. The light receiving component is located on the upper surface of the base. And the light emitting component is positioned on the lower surface of the base and is positioned at the base mounting part. And the base mounting part is used for mounting and avoiding the light emitting component. The bottom surface of the first concave part is concave relative to the lower surface of the bearing platform, so that an electric connecting line between the light emitting component and the circuit board is shortest. The hot surface of a semiconductor cooler of the light emitting component is connected with positive and negative power supply wires, conductive pins are arranged on the upper surface of the circuit board and located at the third notch, and the positive and negative power supply wires on the hot surface of the semiconductor cooler are connected with the conductive pin wires.

The invention discloses a low-ripple closed-loop negative-voltage charge pump circuit in the technical field of analog integrated circuits, and the circuit comprises a charge pump closed-loop modulation circuit, the output end of the charge pump closed-loop modulation circuit is connected with the low-ripple negative-voltage charge pump circuit, and the low-ripple negative-voltage charge pump circuit is used for receiving positive power supply voltage input and outputting negative power supply voltage; the low-ripple negative-voltage charge pump circuit comprises a charge pump module, the first end of the charge pump module is connected with the first end of the positive power supply filter capacitor and the output end of the charge pump closed-loop modulation circuit, and the charge pump module outputs an output signal through the first end. By fixing the switching frequency of the low-ripple closed-loop negative-voltage charge pump circuit, the influence of switching noise on the system is reduced without repeatedly starting and stopping or changing the switching frequency of the charge pump, meanwhile, the size of a positive power supply is adjusted in a closed-loop mode through a negative feedback loop, and the voltage of the positive power supply of the charge pump is dynamically compensated. And the output voltage excursion of the traditional charge pump under large current is reduced.

The invention relates to a power module unit, which comprises a lining plate, a first power chip, a second power chip, a positive power terminal, a negative power terminal and an output power terminal, the lining plate comprises an insulating plate body and a first conductive layer arranged on the upper side face of the insulating plate body. The first conductive layer comprises a first conductive area, a second conductive area and a third conductive area which are sequentially arranged at intervals in the first direction. The first power chip is connected between the first conductive region and the second conductive region, and the second power chip is connected between the second conductive region and the third conductive region to form a power circuit; the positive power terminal is connected with the first conductive area, the output power terminal is connected with the second conductive area, and the negative power terminal is connected with the third conductive area. The invention further provides a power module and a vehicle. According to the invention, the current flowing path of the power module unit is shortened, the inductance offset scheme of the power module unit is optimized, and the parasitic inductance of the power module unit can be obviously reduced.

The invention discloses a heterogeneous energy storage system distributed control method and system under any preset time, and belongs to the field of heterogeneous energy storage system distributed control. The method comprises the following steps: dividing the heterogeneous energy storage system into a battery cluster, a flexible load cluster and a building group according to electrical characteristics; each equipment unit is provided with a follower agent, and each cluster is provided with a leader agent. Parameters of an observer, a controller and a system are set, the state of the follower is set, and the state of a leader is initialized into the state of the first communication follower. The convergence time of the observer is set, and an observation value is initialized; after the system target power is issued, the leader judges the system state according to the positive and negative power, and distributes the total target power of each cluster. The observer monitors the error between the intelligent agent and the leader in real time, the follower updates the state and adjusts the equipment power accordingly, and the leader synchronously updates the own state. Through the cooperative control mechanism, the system realizes accurate distribution and regulation of target power within a preset time, and completes a multi-cluster cooperative power management task.

The utility model discloses a parallel operation copper bar and system of an electronic load, and the parallel operation copper bar comprises a positive electrode copper bar which is used for connecting the positive electrode power input end of the electronic load; the cathode copper bar is used for connecting a cathode power input end of the electronic load, and the cathode copper bar and the anode copper bar are oppositely arranged at an interval; the insulating plate is arranged between the positive electrode copper bar and the negative electrode copper bar, and the positive electrode copper bar and the negative electrode copper bar are tightly attached to one side face of the insulating plate respectively. According to the invention, the amplitude of current overshoot oscillation can be reduced, and the reliability and safety of the parallel operation system of the electronic load are improved.

The invention relates to the technical field of display, and relates to a display panel and a display device. The display panel comprises a display area and a first area surrounding the bottom of the display area, the display panel comprises a substrate and a multi-layer film layer structure, and the multi-layer film layer structure comprises a first metal layer, a first flat layer, a first electrode layer, a pixel definition layer and a second electrode layer which are sequentially arranged; a first sub-part of the first flat layer is provided with a first channel penetrating in a first direction; the first sub-part of the first electrode layer is electrically connected with the part of the first sub-part of the first metal layer, which is used as a negative power supply voltage wire, through a first channel; the first sub-part of the pixel definition layer is provided with a second channel penetrating in the first direction; the polarity of the second electrode layer is opposite to that of the first electrode layer, and the first sub-part of the second electrode layer is electrically connected with the first sub-part of the first electrode layer through the second channel. According to the display panel, VSS line impedance can be effectively reduced under the condition that the width of the frame is not increased, and meanwhile the problem of highlight burn is solved.

The invention provides a compact type low parasitic inductance half-bridge packaging structure, which is characterized in that two ends of a main substrate are provided with a positive electrode connecting terminal and an alternating current connecting terminal, a first chip and a second chip are arranged between the two terminals, a positive electrode power electrode of the first chip is electrically connected with the positive electrode connecting terminal, and a negative electrode power electrode of the second chip is electrically connected with the alternating current connecting terminal; a positive power electrode of the second chip is electrically connected with the alternating current connecting terminal, and a negative power electrode of the second chip is electrically connected with the negative terminal; the control substrate is arranged over the two chips in a crossing mode, a first gap bridge connecting piece is arranged on the surface of one side of the control substrate, a negative power electrode of the first chip is electrically connected with the alternating current connecting terminal through the gap bridge connecting piece, and a plurality of grid connecting pieces capable of being electrified with grids of the two chips are arranged on the surface of the other side of the control substrate. The control substrate is arranged above the main substrate, so that the grid electrode of the device is arranged above the space, larger plane space occupied by the grid electrode is reduced, meanwhile, the distance between the grid electrode connecting piece and the chip grid electrode is shortened, and the overall size of the packaging structure is reduced.

The invention relates to an MOSFET (Metal-Oxide-Semiconductor Field Effect Transistor) power semiconductor module, a motor controller and an automobile. The MOSFET power semiconductor module comprises a substrate, a plurality of power electrode terminals, a plurality of signal terminals, an upper bridge chipset, a lower bridge chipset, a signal connecting piece, an interconnection heightening layer and an interconnection substrate, the substrate is provided with a signal copper layer area, a chipset area and a substrate power copper layer area. The plurality of power electrode terminals comprise a direct-current negative power electrode terminal, a direct-current positive power electrode terminal and an output power electrode terminal; each signal terminal is respectively connected with the driving areas on the silicon-based IGBT power chips in the upper bridge chip group and the lower bridge chip group through corresponding signal connecting pieces so as to form a driving path; the direct-current positive power electrode terminal is connected with the direct-current negative power electrode terminal through the power copper layer, the chipset, the interconnection heightening layer and the interconnection substrate on the substrate to form a power path. According to the invention, the problems of large electromagnetic interference and inconsistent dynamic and static current sharing are solved.

The invention discloses a multi-voltage inverter welding machine control circuit power supply method and an inverter welding machine, relates to the technical field of welding, and designs a power supply circuit, a driving circuit, an inverter circuit and a power supply transformer which are connected in sequence. Rectifying and filtering, BUCK voltage reduction and BUCK-BOOST conversion are sequentially carried out on the low-voltage alternating current to generate stable positive and negative power supply voltage to supply power to the driving circuit; a driving circuit is utilized, a PWM control strategy based on phase shift driving is adopted to drive an inverter circuit to operate, and the inverter circuit converts stable direct current in a main loop of the multi-voltage inverter welding machine into stable alternating current according to the PWM control strategy; the converted stable alternating current is connected to the primary side of the power transformer, and the secondary side of the power transformer supplies power to a control circuit and auxiliary tools of the multi-voltage inverter welding machine. According to the invention, only one power supply circuit is additionally arranged, so that stable power supply for the multi-voltage inverter welding machine is realized.

The invention discloses a hybrid self-switching bidirectional wireless switched reluctance motor driving system provided and realized by the invention. An independent demagnetization loop is arranged on the motor side, rapid demagnetization is allowed, and energy recovery is achieved. The system wirelessly drives a multi-phase SRM through a single power transfer channel using a single resonant frequency to reduce coupling between multiple power channels. When the WPT system is in forward power, the LCC-S compensation network is adopted to drive the motor load, and the advantage of constant voltage gain when the load changes is achieved; the LCC-LCC / S hybrid self-switching compensation network is adopted to realize charging of a battery load, and has a constant voltage / constant current characteristic; and when the WPT system has negative power, the LCC-LCC compensation network is adopted to realize reverse recovery of energy, and energy interconnection between the motor and the power grid is realized. In addition, an SR motor does not need to be specially designed, and the system has the remarkable advantages of phase current balance, flexible transmission distance, high integration level, maintenance-free property and the like.

A module system (20) includes a safety module (32) and an external output module (36). The external output module has: a first positive input terminal (170a) electrically connected to a positive electrode (26p) of a power supply (26); a negative input terminal (180) electrically connected to a negative electrode (26n) of the power supply; a positive power supply terminal (176) electrically connected to the first positive input terminal and electrically connectable to an external device (22); and a negative power supply terminal (186) electrically connected to the negative input terminal and electrically connectable to the external device.

The present application discloses an optical lens and an electronic device. The optical lens includes a first lens with positive focal power, a second lens with negative focal power, a third lens with positive focal power, and a fourth lens with positive focal power in sequence from the first side to the second side along the optical axis. The second side surface of the first lens is a convex surface, the first side surface of the second lens is a concave surface, the first side surface of the third lens is a convex surface, and the first side surface of the fourth lens is a convex surface. The air interval T34 between the third lens and the fourth lens on the optical axis and the distance TTL from the center of the first side surface of the first lens to the last optical surface of the optical lens on the optical axis satisfy 0<T34 / TTL≤0.5; the effective focal length F4 of the fourth lens and the combined effective focal length F13 of the first lens to the third lens satisfy 0.1<F4 / F13≤1.5; the air interval d2 between the first lens and the second lens on the optical axis and the distance TTL from the center of the first side surface of the first lens to the last optical surface of the optical lens on the optical axis satisfy 0.01≤d2 / TTL≤0.1.