(1) The drive waveform of soft switch welding machines rises and falls at an angle, as shown in the figure below. The waveform of hard switch machines is like a single tube wave, rising and falling straight. Issues with absorption can cause spikes in the waveform. During maintenance, some waveforms may be unfamiliar; if the … Read more
1. Repair Procedure for Burnt IGBT or Fuse on the Circuit Board If the current fuse or IGBT is burnt, do not replace the component immediately. You must confirm that the following other components are in normal condition before replacement; otherwise, the IGBT and fuse may burn out again. 1. Visually check if the current … Read more
Introduction In the failures of medical equipment, issues often arise from certain key chips, leading to abnormal control signals and erratic device actions. In these situations, the oscilloscope becomes a powerful tool, allowing for the rapid identification of key signals and the localization of the root problem. This article analyzes a fault repair case of … Read more
During the repair process of welding machines, we often encounter some difficult issues, and at this time, we will use the oscilloscope. Case:NBC270Gas shielded welding with manual welding The fault phenomenon is that the gun outputs gas and feeds wire normally, but does not melt the wire. After excluding problems with the main control board, … Read more
Summary The analyst team of ASPENCORE’s “Electronic Engineering Magazine” conducted first-hand tracking surveys and analyses, combined with information from various companies’ official websites and public data, to select 30 domestic power management chip and power semiconductor manufacturers. They have provided appropriate quantitative assessments and comprehensive strength statements. This is another heavyweight report in the China … Read more
To reduce the environmental impact of automobiles, we must focus on making gas vehicles more “environmentally friendly”. In other words, we need to optimize the efficiency of the engine. The good design of the electronic ignition system is the best guarantee for control, safety, and optimization of combustion. Inductive Discharge Ignition System (IDI) To better … Read more
This machine was repaired with the assistance of one of our students, who reported that the machine had no no-load voltage. This is a single-phase 220 single board IGBT machine. We first disconnected the high voltage and applied 310V. We measured the drive waveform of the tube using an oscilloscope and found none. Next, we … Read more
Abstract: In order to verify the overcurrent protection and short-circuit protection functions of the circuit breaker and accurately grasp its working state, a set of circuit breaker calibration device based on DSP and the latest control technology of power electronics is developed. The DSP was used to calculate the test parameters and control the SPWM. … Read more
Introduction Currently, the entire automotive chip market has high requirements for safety and reliability, such as AEC-Q testing and ASIL product certification, to achieve functional safety in product development, production, and process management/control. However, most chips in the automotive market are monopolized by foreign manufacturers, such as Renesas, NXP, Infineon, Texas Instruments, Microchip, and STMicroelectronics. … Read more
Today, let’s briefly discuss IGBTs in power semiconductors, which is currently a very popular track in the semiconductor industry chain. Power semiconductors are a core part of the entire industry, positioned after semiconductor materials and equipment. A term often mentioned here is “power devices”; some people think these two are the same, but they are … Read more