8 results about "Electric intensity" patented technology

The invention discloses a power module packaging structure. According to the chip, a non-linear conductive material coating is arranged at the connecting part of the edge of each metal bonding pad and a chip substrate, and the connecting part of the edge of each metal bonding pad and the chip substrate is the joint of the metal bonding pad, the chip substrate and an insulating encapsulating material, namely the three-phase point. Through the arrangement of the non-linear conductive material coating, the resistivity is high in a normal low field, and electric leakage is prevented; and when the local electric field intensity is increased sharply (terminal at the three-phase junction), the resistivity is reduced sharply, the electric field is uniformly dispersed, and the peak of the local electric field is inhibited, so that the overall dielectric strength and creepage distance of the module are improved. According to the technical scheme, the insulation reliability of the power module under high-voltage, high-frequency and high-temperature working conditions is remarkably improved, particularly, partial discharge is restrained at a three-phase point, the service life of the module is prolonged, and the production and maintenance cost is reduced.

The invention discloses a high-precision multi-channel data acquisition method, relates to the technical field of multi-channel data acquisition, and is used for solving the problem that the risk of beam mode distortion caused by pumping current fluctuation is increased. Pumping current is acquired in a laser cavity to calculate a fluctuation coefficient, and an alternating-current impedance amplitude is acquired in combination with impedance detection; carrying out standardized multiplication to generate an electric strength coefficient, calibrating a statistical coefficient in time to obtain a reference threshold value, calling a gain factor, obtaining a light beam radius variable quantity by using an extra-cavity detector, calculating a down-regulation ratio to obtain a down-regulation threshold value, comparing the electric strength coefficient with the down-regulation threshold value, and if a light beam mode is distorted, carrying out standard multiplication; if yes, triggering the multi-channel wavefront sensing array to collect information and check triggering consistency, and if not, correcting a current fluctuation coefficient based on light beam intensity, combining impedance to generate an update coefficient, comparing the update coefficient with a down-regulation threshold value, and if the update coefficient exceeds the limit, triggering an alarm and outputting a protection instruction; and beam mode distortion caused by pumping current fluctuation is effectively avoided.

A sensor device for monitoring dielectric strength of a dielectric fluid has a sensor body which supports a sensitive part (SGi), designed for contact with the dielectric fluid. The sensitive part (SGi) comprises at least one pair of electrodes (E1, E2) having respective surface portions arranged at a predefined micrometric or sub-micrometric distance, to define therebetween at least one detection gap between which part of the dielectric fluid is suitable to seep in. The sensor device has a circuit arrangement comprising: —means for generating an electric field between the two electrodes of the at least one pair of electrodes (E1, E2) starting from a known supply voltage, and—means (V) for measuring a voltage representative of possible occurrence of an electric discharge between the two electrodes of the at least one pair of electrodes (E1, E2) through the dielectric fluid (5) present in the at least one detection gap (G), following generation of the electric field.

The application discloses a kind of high surface natural micropore structure regulation-based high surface withstand voltage polyimide and preparation method and application thereof, belong to high voltage insulating material technical field, after drying diamine is dissolved in solvent A, then add dianhydride, after stirring uniformly, obtain polyamide acid solution;Add pore forming agent again, high-speed stirring is uniformly dispersed, obtain mixed viscous solution C;After coating, drying, imidization high temperature heating, and natural cooling, immerse in liquid B and extract pore forming agent, after drying, obtain high surface natural micropore structure regulation-based high surface withstand voltage polyimide.The polyimide surface has natural pore structure, surface is along the surface of electric field, and the through-hole structure is densely distributed along the surface of electric field, and the electron is easy to drop into the through-hole structure in the jumping multiplication process when flashover, and it is difficult to return to the surface, so that the secondary electron multiplication process is inhibited, the probability of forming secondary electron avalanche is reduced, so as to realize the improvement of surface withstand voltage.

Provided is a method for identifying and positioning partial discharge of a high-voltage cable, which includes: collecting a partial discharge pulse signal; performing noise reduction processing on the partial discharge pulse signal to obtain a denoised partial discharge characteristic signal; inputting the denoised partial discharge characteristic signal into a pre-trained lightweight residual attention network to output a discharge type discrimination result, a discharge intensity, and characteristic parameters; and using, based on the discharge type discrimination result, the discharge intensity, and the characteristic parameters, a self-correcting dual-end localization algorithm to position a discharge source, including: measuring a time difference of arrival of the partial discharge pulse signal at the two ends of the high-voltage cable, and calculating, based on the time difference, the discharge type discrimination result, the discharge intensity, the characteristic parameters, and a length parameter of the high-voltage cable, a position of the discharge source.

The invention discloses a power equipment ultrasonic partial discharge state evaluation and health management method, and relates to the technical field of electrical equipment testing, and the method comprises the steps: carrying out the reverse gain compensation of an ultrasonic pulse waveform, and obtaining the real discharge intensity at a partial discharge source; the real discharge intensity is converted into the single discharge damage amount of the internal performance degradation degree of the insulation structure; the single discharge damage amount and the past damage amount in the historical operation process are accumulated and fused, and the total damage degree change process of degradation of the electrical equipment insulation structure evolving along with time is constructed; a dynamic health index is obtained according to the total damage degree change process; on the basis of the total damage degree change process and the dynamic health index, deducing the degradation trend of the power equipment insulation structure to a failure critical state; the residual safe operation life of the power equipment is predicted according to the degradation trend, and the fault prediction and grading operation and maintenance management level of the power equipment in the whole life cycle is improved.

The invention is suitable for the technical field of thermal management system sensing and high-voltage insulation safety, and provides a parameter calculation method of an insulation three-in-one sensor in a thermal management system. Obtaining a high voltage value, an effective insulation thickness, an electric field non-uniform coefficient and material electric strength to calculate maximum equivalent electric field intensity and an insulation margin, and taking the condition that the insulation margin meets a preset insulation margin as a structural design constraint; the output voltage of the power supply is adjusted by using a PWM duty ratio mode, and the PWM duty ratio is adjusted by using discrete PI to control the stable voltage output of the power supply; the temperature is obtained, the original pressure is read for compensation, the compensated pressure is calculated, the compensated pressure is filtered, and the corrected pressure is output; wherein the insulation margin can be calculated, threshold constraint can be set, the influence of power supply fluctuation on sensing output is reduced by controlling power supply voltage stabilization output, further, the pressure output stability and the anti-noise capability are improved by performing temperature drift compensation and fusion filtering on the pressure, and the user experience is further improved.

Method for performing a dielectric strength test of a high-voltage battery (50), in particular of an electrically operated vehicle, with a device (100) comprising a first DC voltage connection (10) and a second DC voltage connection (12) for electrical connection to an intermediate circuit (40) and / or an internal circuit (52) of the high-voltage battery (50), and a ground connection (14) for electrical connection to a ground potential (GND) of the high-voltage battery (50), wherein the ground connection (14) has a first switching element (16) for establishing and / or disconnecting the electrical contact to an electrical ground potential (32) of the device (100), at least comprising Electrical connection of the high-voltage battery (50) to the first and second DC voltage terminals (10, 12), as well as the ground terminal (14); Closing of contactors (54, 56) of the high-voltage battery (50); Measuring a voltage between the first and second DC voltage terminals (10, 12); and Measuring a voltage between the intermediate circuit (40) and the electrical ground potential (32) of the device (100), characterized by the fact that the first switching element (16) is opened when no voltage can be measured between the intermediate circuit (40) and the electrical ground potential (32); and / or the high-voltage battery (50) is electrically connected to a control terminal (18) of a control line (20) of the device (100) for controlling the contactors (54, 56) of the high-voltage battery (50), wherein an electrical contact between the intermediate circuit (40) and the internal circuit (52) of the high-voltage battery (50) can be established and / or disconnected by means of the control line (20), and wherein in the event of a fault the contactors (54, 56) of the high-voltage battery (50) are opened by means of a second switching element (22) of the control terminal (18) of the control line (20).