49results about How to "Improve electromagnetic compatibility characteristics" patented technology

The invention discloses a microcontroller used for improving the electromagnetic compatibility characteristic of an automobile electronic control system. A multi-mode clock generation module and an IO port module are improved, a clock gating method is applied to the multi-mode clock generation module, the electromagnetic compatibility characteristic of the IO port module is reinforced with a turning rate and driving strength control method, and the electromagnetic compatibility characteristic of the automobile electronic control system is effectively improved. The microcontroller used for improving the electromagnetic compatibility characteristic of the automobile electronic control system has the advantages of being simple in structure and high in adaptability, clocks and ports which are applied to an automobile electronic MCU are rich in configuration function, different working modes and using characteristics can be configured according to the requirement of the system, all the independent peripheral clocks can be subjected to gating setting, the functions of open-drain setting, upward and downward pull, digital / analog function multiplex, interrupt multiplex, EMC control and the like are integrated on the ports, and high flexibility and high configurability are achieved.

The invention discloses a preparation method of ferrite solid waste-based electromagnetic wave absorbing material doped with excess zinc. Starting from the perspective of ferrite crystal structure, the spinel structure iron can be made through the substitution doping of excess zinc atoms Fe at the A site in the oxygen body 3+ in Zn 2+ Driven by the drive, more enter the B position, increase the molecular magnetic moment, greatly enhance the response of the magnetic moment to electromagnetic waves, thereby improving the magnetic loss performance of the low-loss magnetic core solid waste, and balancing the magnetic loss difference between different mixed solid waste , to obtain high-performance broadband electromagnetic wave absorbing materials and devices. The invention has simple operation, short production cycle and low requirements on equipment hardware, and can be widely used in electromagnetic shielding, anti-electromagnetic interference, and anti-electromagnetic radiation of various electronic and electrical and wireless communication equipment, and has excellent low-frequency electromagnetic wave absorption performance , is widely used.

An exhaust pipe for a magnetron used in a microwave oven, comprising a tubular body and a fixed wall extending outward from the outside of the pipe body and bending downwards, the exhaust pipe is arranged above the antenna cover of the magnetron On the ceramic ring, and the lower part of the ceramic ring is fixed with the antenna cover, the top of the tube body is sealed after vacuuming, and the length of the tube body is reduced by 20‑25% after sealing; the lower end of the fixed wall extends to the farthest plane and the tube The distance between the planes where the lowest point of the body lies is reduced by 18‑21%. By changing the reserved length of the upper end of the pipe body and the length of the lower end of the pipe body protruding from the fixed wall, the choke capacity of the exhaust pipe for the third harmonic and the fourth harmonic is improved, and the useless high noise generated during the operation of the magnetron is correspondingly suppressed. Frequency harmonics, without causing changes in the characteristics of the magnetron, improve the electromagnetic compatibility characteristics of the magnetron used in microwave ovens.

The invention provides a semi-directional adjusting circuit, which is used for adjusting output signals of at least an auxiliary circuit of a signal source. The semi-directional adjusting circuit includes a transformer having at least two windings. An output main circuit of the signal source is in series with a first winding of the transformer; the auxiliary circuit requiring signal adjustment is in series with at least the other winding of the transformer. By adopting the technique of the semi-directional adjusting circuit provided by the invention, the voltage adjusting amplitude can be large without loss increase, and thus the invention is beneficial for increasing power efficiency and also the reliability. The semi-directional energy consumption can be controlled through the duty cycle of main circuit adjustment, which is free from the limit by a relatively high quantity or a relatively low quantity of specific output of the auxiliary circuit. The invention can realize complete compensation under the condition that the output of all the auxiliary circuits is relatively low. The voltage adjusting amplitude can be directly used for quantum calculation, without effect from the duty cycle. Besides, the voltage adjusting cost is low, the performance cost ratio is high, and the electromagnetic characteristics of relevant output circuits can be improved as well.

The invention discloses a multiple output supply, comprising a transformer provided with at least two output paths, a power control module for controlling the input of the transformer, and a voltage detecting comparison module. The voltage detecting comparison module detects an output voltage of a certain output path in a plurality of output paths except a main output path provided with feedback,and outputs the detecting result to the power control module; the power control module can start up the protection according to the detecting result. The invention further comprises a mutual-inductance element, wherein the mutual-inductance element is in series connected to a detecting output path which is connected with a voltage detecting module and at least one output path of the multiple output supply respectively. The circuit of the invention is very simple, complicated circuits, such as reference source and comparator, are not needed, and the parts that can bring depletion such as resistance are not required.

The invention discloses a multi-path output power supply, comprising a transformer having at least two output paths, a power supply control module and a voltage detection comparing module. The at least two output paths comprise a main output path and an assistant output path. The output end of the power supply control module is connected to the input end of the transformer through the switch pipe. The output end of the voltage detection comparing module is connected to the input end of the power supply control module; further comprising a mutual inductor comprising a detecting winding connected to one input end of the voltage detection comparing module and an output path winding connected in series to at least two output paths. The circuit of the invention is extremely simple without complex circuits, for example, reference source, and comparator and without adding apparatus such as resistor which brings loss. The invention not only processes overcurrent or short-circuit protection simultaneously for multi-path output, but also processes overcurrent protection for the main output path and all assistant output paths simultaneously.