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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
Open-Source Three-Phase Energy Meter: Simplifying Home Electricity Monitoring
Electronics / Circuits

Open-Source Three-Phase Energy Meter: Simplifying Home Electricity Monitoring

An open-source three-phase power meter for home energy monitoring uses three PZEM-004T modules with an ESP32-C3 running ESPHome, uploading voltage, current, power, power factor, and energy data to HomeAssistant over Wi-Fi. It measures 80–260V per phase, up to 100A, with 0.5% accuracy. Design files, firmware, and enclosure models are provided.

Published on 2025-02-15
LADS D1500 UPS Teardown Analysis
Reviews & Teardown

LADS D1500 UPS Teardown Analysis

This teardown of a LADS D1500 UPS reveals a line-frequency inverter design with an H-bridge MOSFET circuit, transformer, and two 12V/9Ah batteries. Testing showed rapid battery degradation beyond warranty, ~77% conversion efficiency at 104W input, and ~18W no-load power draw. Readers gain insight into internal components, circuit topology, and real-world performance.

Published on 2025-02-04

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