Zeruns's Blog - English Site
DJI Mini 2 Drone Teardown Analysis
Reviews & Teardown

DJI Mini 2 Drone Teardown Analysis

这篇摘要总结了作者对使用四年的DJI Mini 2无人机进行拆解和问题分析的全过程，字数控制在200字以内。 --- 一篇关于大疆Mini 2无人机的拆解分析文章。作者因无人机5.8GHz图传信号变弱，在过保后决定自行拆机维修。文章详细记录了拆解步骤，并对关键芯片进行了技术分析：主控采用NXP的i.MX RT1064处理器；图像处理由安霸Ambarella H22芯片负责；图传系统核心为DJI定制的S1系列芯片，并由QPF4205和QPF4550分别放大2.4GHz和5.8GHz信号（怀疑故障源于后者）；此外，还解析了电机驱动、电源管理及ToF测距等模块的芯片配置与功能。此次拆解旨在排查并更换故障的5.8G功放芯片，修复图传问题。

Published on 2025-10-23
Flyback Power Supply Design: Parameter Calculation, Component Selection & Transformer Winding Guide
Electronics / Circuits

Flyback Power Supply Design: Parameter Calculation, Component Selection & Transformer Winding Guide

This article presents a complete design procedure for a 72W flyback switching power supply (24V/3A) with universal 85-265VAC input. It provides step-by-step calculations for rectifier bridge, input filter, transformer magnetizing inductance and turns, wire selection with skin effect, MOSFET and output diode ratings, output capacitor, and RCD snubber. Key trade-offs such as frequency vs. efficiency, flux density selection, and core AP value are explained. The article also details practical transformer winding, including air gap adjustment and leakage inductance measurement, enabling readers to replicate the design.

Published on 2025-10-13

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