9results about How to "Improve electromagnetic interference" patented technology

The present invention provides a shifting device based on an AMT new energy transmission assembly, which controls multiple shift fork shafts through a set of shifting structures, so that the arrangement of the mechanism is simple and the manufacturing cost is reduced. It includes an upper cover plate, and the upper surface of the upper cover plate is provided with a first shift module, a TCU, and a second shifting module. The second shifting module includes a shifting part and a shifting part. The TCU is electrically connected to the shifting part and the shifting part of the first shift module and the second shifting module, respectively. The bottom of the upper cover plate is provided with a first shift fork shaft corresponding to the lower position of the first shift module. The driving input part of the first shift fork shaft is arranged directly below the lower exposed output part of the first shift module. The second shift fork shaft, the third shift fork shaft, and the Nth shift fork shaft are arranged in sequence parallel to the first shift fork shaft, and each shift fork shaft is fixedly sleeved with a corresponding shift fork structure.

The invention discloses a frequency conversion modulation method and device based on a resonance-assisted commutation technology and a medium, and relates to the technical field of power electronics. The objective of the invention is to solve the problems of a fixed switching frequency sine pulse width modulation resonance auxiliary commutation topological structure. The method comprises the steps of firstly designing a filter of an inverter; modeling harmonic waves of the inverter according to the filter and the load so as to obtain a relation curve of the output current of the inverter along with the change of the switching frequency, and obtaining the maximum switching frequency of variable frequency modulation through the relation curve; obtaining the maximum frequency conversion depth of frequency conversion modulation based on the output bandwidth of the filter; generating a frequency conversion carrier signal periodically changing along with the reference signal according to the maximum frequency conversion depth, wherein the switching frequency of the frequency conversion carrier signal is constrained in a predictable frequency band; and adjusting a driving signal of a switching tube according to the deviation between the frequency conversion carrier signal and the reference signal so as to realize frequency conversion modulation.

This invention provides a liquid-cooled heat dissipation assembly, including a power unit and a liquid-cooled plate for dissipating heat from the power unit. Each converter unit has a circuit structure forming a midpoint-clamped three-level topology. The switching transistors and diodes of each converter unit are combined to form several converter groups spaced apart along the X-axis and extending along the Y-axis. The cooling liquid channel of the liquid-cooled plate has branch channels connected in parallel to each converter group. This invention can reduce the stray inductance of the power unit and improve its heat dissipation efficiency.

A novel tapless resonant push-pull photovoltaic energy storage inverter topology is disclosed, relating to the field of energy storage system topology control technology, specifically a novel tapless resonant push-pull photovoltaic energy storage inverter topology. It includes a photovoltaic boost MPPT circuit, a DC-AC bidirectional inverter circuit, and a battery-side DC-DC tapless resonant push-pull bidirectional isolated charging circuit. The photovoltaic boost MPPT circuit is used to increase the DC voltage of the photovoltaic panels and perform maximum power point tracking control. The DC-AC bidirectional inverter circuit performs bidirectional DC-to-AC conversion through three independent T-type three-level circuits, each independently controlled, with low harmonic output current. The battery-side DC-DC tapless resonant push-pull bidirectional isolated charging circuit includes a tapless transformer and a push-pull circuit. Through innovative tapless resonant push-pull circuit, dual-transformer interleaved control technology, and three-level inverter circuit design, it achieves efficient power conversion, optimized battery charge and discharge management, and reduced high-frequency ripple and electromagnetic interference, thereby improving the overall efficiency, stability, and reliability of the photovoltaic energy storage system.

This application provides a display module, which includes a display panel, a driver chip, and an electromagnetic shielding composite layer. The display panel has a bonding area. The driver chip is bonded to the bonding area. At least a portion of the electromagnetic shielding composite layer is located on the side of the driver chip opposite to the bonding area and includes at least two stacked electromagnetic shielding layers, both of which overlap with the driver chip. Since at least two stacked electromagnetic shielding layers are located above the driver chip, they can shield the radiated signals generated during the operation of the driver chip, thus better mitigating electromagnetic interference caused by radiated signals.

The invention discloses a signal conditioner and circuit for a pulse-driven quantum voltage system. The signal conditioner comprises a signal isolation unit, a signal conditioning unit and a power supply unit, the receiving end of the signal isolation unit is connected with a first signal source, and the output end is connected with the first receiving end of the signal conditioning unit; a second receiving end of the signal conditioning unit is connected with a second signal source, and an output end of the signal conditioning unit outputs conditioned signals; the power supply unit is connected to the signal conditioning unit for power supply. The conditioner simultaneously has a signal conditioning function and a quantum step observation interface function, can be used for establishing a broadband, low-noise and electrically isolated signal measurement environment for a pulse type quantum voltage system, and realizes a function of introducing a low-frequency compensation signal generated by a low-frequency signal source into a Josephson junction; and an interface for observing and checking the width of the quantum voltage step can also be provided.

The invention discloses a super junction MOSFET device with fast reverse recovery performance, which comprises an N + substrate and an N-type epitaxial layer, a plurality of P-type columns are arranged in the N-type epitaxial layer, and the P-type columns and the N-type epitaxial layer form alternative P-type columns and N-type columns; a plurality of P body regions are arranged on the N-type epitaxial layer; a plurality of N + doped regions are arranged on each P body region; gate oxide layers are respectively arranged on two sides and in the middle of the primitive cell, a gate electrode is arranged on the gate oxide layer in the middle, the upper surface of the gate electrode is sequentially covered with a dielectric oxide layer and a source electrode, and the source electrode is insulated from the gate electrode through the dielectric oxide layer; grid polycrystalline silicon is arranged on the grid oxide layers on the two sides, the grid polycrystalline silicon is sequentially covered with a dielectric oxide layer and a source electrode, and the grid polycrystalline silicon is in contact with the source electrode through a contact hole to form an MOS channel diode. According to the invention, the MOS channel diode is integrated in the device without changing the area of the device, and the reverse recovery performance of the device is optimized.

The invention discloses a power supply circuit and power supply equipment, and belongs to the technical field of electronics. The power supply circuit comprises a field effect transistor; the variable resistance circuit is connected with the field effect transistor; the load detection circuit is used for detecting the load voltage of the power supply circuit; the driving circuit is connected with the load detection circuit and the variable resistance circuit; wherein the driving circuit is used for driving the variable resistance circuit to increase the resistance value under the condition that the load voltage is greater than a preset threshold value, and driving the variable resistance circuit to reduce the resistance value under the condition that the load voltage is smaller than the preset threshold value.

The utility model discloses a voltage converter control panel and a voltage converter, the voltage converter control panel comprises a circuit board, the circuit board is provided with a main control circuit board installation area, a DCDC voltage reduction circuit board installation area and a switch control circuit board installation area; the main control circuit board mounting area is provided with a main control circuit board, the DCDC step-down circuit board mounting area is provided with a DCDC step-down circuit board, the switch control circuit board mounting area is provided with a switch control circuit board, and the main control circuit board is vertically connected to the DCDC step-down circuit board; and the DCDC step-down circuit board is horizontally arranged close to the switch control circuit board. According to the utility model, the weak current installation area and the strong current installation area are arranged on the circuit board, so that the electromagnetic interference and electromagnetic interference resistance of the circuit board are improved, the working reliability of the voltage converter control panel is improved, and the working reliability of the voltage converter is further improved.