18results about How to "Uniform current" patented technology

The invention discloses a multi-phase power supply and a control circuit thereof, and the circuit comprises a feedback control circuit which is used for generating a phase switching signal according to a feedback signal of an output voltage and a reference voltage signal; the switch control circuit is used for generating a plurality of frequency division signals according to the phase cutting signal and controlling the main power tube of the corresponding power level circuit to be conducted according to the logic state of the plurality of frequency division signals; and the turn-on time control circuit is used for generating a turn-off trigger signal when the turn-on time of the main power tube of the triggered power level circuit reaches a set time, and the switch control circuit controls the turn-off of the main power tube of the triggered power level circuit according to the turn-off trigger signal and the plurality of frequency division signals. According to the multi-phase power supply, phase dislocation control among a plurality of power level circuits can be realized only by adopting one control loop, the circuit structure is simple, and circuit design simplification and circuit cost reduction are facilitated.

A flexible circuit board includes a substrate, a plurality of circuit patterns disposed on the substrate, and a protective layer disposed on the circuit patterns, wherein each of the plurality of circuit patterns has a thickness greater than 8 µm and less than or equal to 25 µm, and wherein a thickness deviation between the plurality of circuit patterns is 0.5 µm to 3 µm. When the flexible circuit board is connected with a display panel, the display panel can have high performance and high current can flow through the display panel. The circuit pattern having the features according to the present invention is prevented from being damaged by high current.

The utility model relates to the technical field of semiconductors, and provides a circuit board assembly, which comprises a printed circuit board and a bonding pad, and the bonding pad is arranged on a first surface layer of the printed circuit board; the printed circuit board comprises a first copper layer, the first copper layer covers the bonding pad, and the first copper layer is symmetrically arranged relative to the first direction of the printed circuit board; the printed circuit board is also provided with a plurality of signal hole groups, and the plurality of signal hole groups are arranged close to the bonding pad. The circuit board assembly is good in heat dissipation effect and balanced in overcurrent, thereby improving the stability and reliability of the circuit board assembly.

The present application relates to an IGBT parallel current-sharing circuit, which includes a first IGBT branch circuit and at least one second IGBT branch circuit, wherein the first IGBT branch circuit is connected in parallel with the second IGBT branch circuit, the first IGBT branch circuit is a branch circuit through which current passes first, and an annular inductive element is commonly provided on the outer side of one end wire of each second IGBT branch circuit and the outer side of one end wire of the first IGBT branch circuit, and the current flow direction of the first IGBT branch circuit in each of the inductive elements is opposite to the current flow direction of the second IGBT branch circuit. The present application has the effect of facilitating current balancing in the branch circuit.

The present application relates to a current balancing method, device, parallel H-bridge circuit and energy storage system, which are applied to the parallel H-bridge circuit, wherein the parallel H-bridge circuit includes a plurality of mutually parallel monomer H-bridge units, wherein the monomer H-bridge unit includes a plurality of switch elements, and the method includes: determining the expected state of the parallel H-bridge circuit at the next moment, and determining the target state of each monomer H-bridge unit at the next moment according to the bridge arm current of the parallel H-bridge circuit, the average current of each monomer H-bridge unit at the current moment, and the rated current of the switch element, so as to control the working state of each switch element in each monomer H-bridge unit according to the expected state and each target state, so that the difference between the average currents of each monomer H-bridge unit at the next moment is less than the preset difference. The use of this method can reduce costs.

This application relates to semiconductor technology and discloses a power semiconductor module and its driving circuit and electronic device. The power semiconductor module includes at least two groups of power semiconductor devices, a substrate, and multiple control signal pins. Each power semiconductor device group includes two power semiconductor devices forming a bridge arm structure, with each group connected in parallel. Each power semiconductor device is mounted on the substrate. The control terminal of each power semiconductor device is connected to a corresponding control signal pin. By using parallel power semiconductor device groups for current shunting, the system's power capacity and heat dissipation efficiency are greatly improved. Furthermore, connecting the control terminals of each power semiconductor device to separate control signal pins allows for individual control of each device, ensuring current balance among the parallel power semiconductor device groups and significantly improving the module's reliability.

The present disclosure relates to the technical field of motors, and in particular, relates to a stator assembly and a motor. The stator assembly includes: a stator core and a winding; wherein a plurality of stator slots are arranged in the stator core, the stator slots being successively arranged in an annular array along a circumferential direction of the stator core; and the winding is wound on a rectangular conductor; wherein a plurality of layers of rectangular conductors are mounted in each of the stator slots, the layers of rectangular conductors being successively arranged along a radial direction of the stator core; wherein an average cross-sectional area of the rectangular conductors close to a center of the stator core is greater than an average cross-sectional area of all the rectangular conductors in the stator slot. This reduces loss density, balances heat generation and heat dissipation of different conductors in the stator slots, so as to improve heat dissipation performance of the motor by reducing a maximum temperature of the motor.

The embodiment of the utility model provides an imaging enhancement device and a battery piece detection device, and the device comprises a resistor unit which comprises a plurality of resistors which are connected in parallel; the first end of one resistor is electrically connected with the first end of the main grid in the battery piece, and the second end of the resistor and the second end of the main grid are electrically connected with the positive and negative electrodes of the power supply respectively to form a loop; wherein the battery piece comprises a plurality of main grids, and one main grid corresponds to one resistor, so that a plurality of loops are formed. According to the technical scheme provided by the embodiment of the invention, the resistor is connected between the main grids and the power supply, so that the current among a plurality of loops formed by the plurality of main grids and the power supply is more uniform, the brightness of EL imaging is uniform, and the condition that the defect of a dark surface area in an image is difficult to identify or the dark surface area is misjudged as the defect of a battery piece is avoided.

The invention discloses a circuit determination method and device, a nonvolatile storage medium and electronic equipment. The method comprises the following steps: acquiring respective current-sharing voltage of a plurality of chips; a plurality of initial circuit models are established respectively, and the number of parallel branches included in each initial circuit model is the same; according to the respective current-sharing voltage of the plurality of chips, a plurality of groups are determined in the plurality of chips, the number of chips included in the plurality of groups is the same, and the number of parallel branches included in the plurality of initial circuit models is the same; and according to the plurality of groups, chips are matched for the plurality of initial circuit models to obtain a plurality of target circuit models, so that currents in a plurality of parallel branches included in the target circuit models are uniform. According to the invention, the technical problem of unbalanced current in a multi-chip parallel circuit is solved.

The application discloses a power module terminal and a power module, and belongs to the field of power electronic power modules. The power module terminal comprises a main body part and a leading-out part extending outwards from the main body part. Two current introduction holes are arranged on the main body part, and a current leading-out hole is arranged on the leading-out part. A groove is arranged between the current leading-out hole and the outer edge of the main body part. The power module comprises a substrate, an upper bridge power chip set and a lower bridge power chip set arranged on the substrate, a positive copper layer and a negative copper layer, and further comprises a positive terminal and a negative terminal. The positive terminal and the negative terminal are the power module terminal described above, and are electrically connected to the positive copper layer and the negative copper layer through two current introduction holes respectively. The application solves the problems of large deformation in the welding process and large residual stress of the welding points after welding of the large-area terminal.

The invention provides an ultrathin buried resistor copper foil and a preparation process and application thereof, and belongs to the technical field of PCB manufacturing. The preparation process of the ultrathin buried resistor copper foil comprises the following steps: (1) pretreating the carrier copper foil; (2) preparing a peelable layer; and (3) preparing the ultrathin buried resistance copper foil. By electrically depositing the zinc-nickel alloy metal layer on the surface of the organic layer, the conductivity of the organic layer can be remarkably improved, and the binding force and the stripping force between the strippable layer and the ultrathin copper foil layer can be matched. The surface of the ultrathin copper foil layer is etched to obtain a resistance window, then the resistance layer is obtained through electro-deposition in the resistance window, the ultrathin buried resistance copper foil is obtained through silanization, base material pressing and peelable layer removal, the copper foil and the resistance area can be obviously distinguished, no resistance layer exists below the ultrathin copper foil layer during use, and the size design of the resistance layer can be more accurate downstream.

The invention relates to the field of power converters, and particularly provides a compensation driving circuit of a power converter and the power converter, and the compensation driving circuit comprises a compensation time calculation module, a driving signal generation module and a driving circuit, the compensation module is used for acquiring a current zero-crossing comparison signal reflecting the conduction condition of a rectifier tube at the output side of the power converter and a sampling driving signal of a rectifier bridge at the output side of the power converter, and calculating compensation time according to the current zero-crossing comparison signal and the sampling driving signal; and the driving signal generation module is used for acquiring a conduction signal representing the conduction condition of the rectifier tube by the high level, generating a final driving signal according to the conduction signal and the compensation time, and outputting the final driving signal to the driving circuit. Therefore, the rectifier tube is driven according to the compensation time and the conduction signal, meanwhile, the delay caused by the driving circuit can be compensated, and the rectified output current is balanced through compensation driving.

The present invention relates to a multi-wire parallel-wound coil disk for magnetically coupled wireless power transmission, including a coupling coil, a high-frequency soft magnetic body, a shielding aluminum plate and other components. The coupling coil is planar, formed by a plurality of wires tightly wound together, and can be a single coil or a plurality of coils. When it is a single coil, the starting and ending points of the plurality of wires wound together are rotationally symmetrically distributed in the coil plane, that is, the single coil wound by each wire has rotational symmetry and has the same inductance and resistance value, and direct parallel connection can balance the current of each wire. When it is a plurality of coils, the encircling parts of each coil constituting the plurality of coils are rotationally symmetrically distributed in the plane of the plurality of coils with the center of the entire coupling coil. Under the premise of satisfying the current density, the present invention realizes the optimal coverage width of the coil and the tight winding of the plurality of wires, which can greatly improve the coupling coefficient and reduce electromagnetic exposure; the number of coil turns (which can be a non-integer) can also be adjusted at will to obtain accurate inductance.

The application provides a chip ESD repair method, system and storage medium based on via optimization, locates a failure point based on a chip ESD test result, determines corresponding ESD protection devices and discharge paths, screens via defects in combination with a layout design file to mark defect points, formulates a via optimization strategy for each discharge path according to the defect points, performs via supplement and through operation according to the optimization strategy, performs symmetry checking on each discharge branch of the ESD protection devices and adjusts a via layout, and outputs a repaired layout after performing design rule checking and electrical rule checking on the optimized layout. The application realizes impedance reduction of the discharge path through via supplement and through operation, realizes current balance of each branch through symmetry checking, and does not need to change the original circuit architecture, and gives consideration to ESD protection performance improvement and high-speed signal integrity maintenance.

The present application discloses an AC power surge protector, which relates to the technical field of power surge protection, and includes a cylinder body, a cover body, an electrode column and a varistor group, wherein the electrode column is coated with a first insulator, a second insulator is arranged in the cylinder body, a positioning groove for placing the varistor group is arranged in the second insulator, the varistor group includes a plurality of varistors stacked in sequence, and each varistor is coaxially placed in the positioning groove, the surface of the varistor is provided with an aluminum sand surface, and a sand pit is arranged on the aluminum sand surface, an aluminum film is arranged between two adjacent varistors, and a clamping structure for clamping the electrode column against the varistor group is arranged on the cylinder body. A gas discharge tube is also installed in the cylinder body, and the gas discharge tube is respectively connected to the varistor group and the cylinder body, and a grounding column is arranged at the bottom end of the cylinder body. The present application ensures that each varistor can evenly share the voltage and current, thereby extending the service life of the AC power surge protector.

The invention discloses a control method and device of a switching circuit, and relates to the technical field of power electronics. After the controller determines that the difference value between the temperature of a target switch in the plurality of switches and the temperature of a reference switch is greater than a difference threshold value, the controller can determine a first loss, which has a relatively large influence on the temperature, in turn-on loss and turn-off loss of the target switch, and can firstly control the target switch to only have the first loss; and after determining that the rising rate of the temperature of the target switch is greater than the rate threshold value, controlling the target switch to only have second loss so as to reduce the temperature difference between the target switch and the reference switch. In this way, it can be ensured that the temperatures of the multiple switches are balanced, and therefore it can be ensured that currents passing through the multiple switches are balanced.

The invention relates to the technical field of motors, and provides a motor and an arrangement method and device thereof. The motor arrangement method comprises the following steps: acquiring a thrust time curve or a displacement time curve of a motor; determining a non-uniform distribution state of motor coil current; and adjusting the relative positions and / or the relative number of the coils and the magnetic poles. The motor arrangement method can effectively improve the electromagnetic field distribution of the motor and improve the operation efficiency and performance of the motor; thermal stress and mechanical stress in the motor are reduced, so that the service life of the motor is prolonged; the non-uniformity can be eliminated, and the operation stability and reliability of the motor are improved.

The invention discloses an electrode and a preparation method thereof, a battery and electric equipment. The electrode includes: an active material layer; the protective layer is positioned on one side of the active material layer, and the protective layer comprises a polymer and an alloy; the alloy comprises a lithium alloy; the polymer includes an acidic polymer.