Zeruns's Blog - English Site
[Open Source] PD65W GaN Charger (ACF), Based on DK8607AD, IP6538-AC-65W, XPM52CDP65
Electronics / Circuits

[Open Source] PD65W GaN Charger (ACF), Based on DK8607AD, IP6538-AC-65W, XPM52CDP65

An open-source 65W PD GaN charger design is presented, combining a DK8607AD-based Active Clamp Flyback (24V/3A) supply with IP6538 or XPM52CDP65 fast-charging DCDC boards. The GaN flyback boards failed during testing, while DCDC boards delivered up to 67.7W with ~95–96% efficiency. Schematics, PCB files, transformer specs, and fabrication materials are provided.

发布于 2026-03-02
[Open Source] SC8703-Based Adjustable Buck-Boost DC/DC Power Supply | Voltage & Current Adjustable, PD Fast Charge Input Supported
Electronics / Circuits

[Open Source] SC8703-Based Adjustable Buck-Boost DC/DC Power Supply | Voltage & Current Adjustable, PD Fast Charge Input Supported

An open-source buck-boost DC/DC module based on SC8703 accepts 2.7–36V input and outputs 1.21–36V with up to 10A, adjustable current limit, 600kHz switching, and 95.45% peak efficiency. It includes XT30 and Type-C PD input via CH224Q. Provided files: KiCad project, Gerbers, BOM, stencils, interactive BOM, and 3D models. Proper heatsinking is required; bare-board operation is recommended below 5A.

发布于 2026-02-23
BenQ RD280U Review: 28" 4K 3:2 Professional Programming Monitor
Reviews & Teardown

BenQ RD280U Review: 28" 4K 3:2 Professional Programming Monitor

The BenQ RD280U is a 28.2-inch 4K programming monitor with a 3:2 aspect ratio, showing about 20% more lines than typical 16:9 displays. It offers dedicated coding modes, KVM switching, 90W USB-C power delivery, and MST daisy-chaining. Hardware low blue light and MoonHalo ambient lighting aim to reduce eye strain. Measured sRGB coverage was 96.2% with average Delta E 2.23, though blue accuracy is limited. The monitor is well-suited for programmers wanting multitasking efficiency, multi-device control, and long-session comfort.

发布于 2025-10-25
WCH CH224K Fast-Charging Protocol Chip: Function Changed but Model Number Remains Unchanged?
Electronics / Circuits

WCH CH224K Fast-Charging Protocol Chip: Function Changed but Model Number Remains Unchanged?

WCH’s CH224K datasheet revision (V1F to V2.1) removed single-resistor voltage configuration, disallowing floating CFG pins for 20V requests. This silently breaks existing designs relying on that method. WCH now recommends CH224A, which supports single-resistor mode but requires a 120kΩ resistor for 20V, complicating direct replacement without extra pads. The article questions whether such functional changes warrant a new model number.

发布于 2025-09-27
Disassembly and Circuit Design Analysis of ZGRL-80 Photography Light
Electronics / Circuits

Disassembly and Circuit Design Analysis of ZGRL-80 Photography Light

The article details a teardown of the ZGRL-80 fill light, revealing false advertising: it lacks PD fast charging despite claims, drawing under 10W via Type-C, and its 80W rating is exaggerated with LEDs consuming about 40W. The analysis covers internal circuitry, battery configuration, and thermal imaging, helping readers identify misleading specs and understand budget device limitations.

发布于 2025-07-03
Open-Source USB 10 Gbps Hub with 2.5 Gbps Ethernet & TF/SD Card Reader (VL822+RTL8156BG+GL3224)
Electronics / Circuits

Open-Source USB 10 Gbps Hub with 2.5 Gbps Ethernet & TF/SD Card Reader (VL822+RTL8156BG+GL3224)

An open-source USB-C dock integrates four 10Gbps USB-A ports, 2.5G Ethernet, and TF/SD readers using VL160, VL822, RTL8156BG, GL3224. It accepts 4-20V input, buck-boosts to 5.1V with up to 9.5A, supporting PD fast charging. Tests show USB read/write 969.65/912.65 MB/s, Ethernet 2089/2497 Mbps, card read 93.04 MB/s, efficiency up to 91.79%. Schematics, PCB files, and replication notes are provided.

发布于 2025-04-29
EG1151 High-Power Synchronous Buck-Boost Power Module (Supports Type-C PD Fast Charging) Open Source
Electronics / Circuits

EG1151 High-Power Synchronous Buck-Boost Power Module (Supports Type-C PD Fast Charging) Open Source

An open-source high-power adjustable buck-boost DC-DC module based on the EG1151 chip is introduced, using fully domestic components. It supports Type-C PD3.1 up to 48V, XT60, and DC5.5 inputs, up to 63V and 20A, with overcurrent and over-temperature protection. Measured peak efficiency is 96.8%, though sustained current is about 18A. Schematics, PCB files, and 3D-printed enclosure models are provided.

发布于 2025-01-16
Open-Source 140W+65W Buck-Boost PD3.1 Fast-Charging Module (2C+1A Ports), IP6557+IP6538,
Electronics / Circuits

Open-Source 140W+65W Buck-Boost PD3.1 Fast-Charging Module (2C+1A Ports), IP6557+IP6538,

An open-source 205W buck-boost fast-charging module based on IP6557 and IP6538 is presented, offering 140W on one Type-C port with PD3.1 support and 65W on the second Type-C and Type-A ports. Maximum conversion efficiency reaches 96.7%. Full documentation and design files are provided, enabling users to replicate a cost-effective charger.

发布于 2024-11-16
Synchronous Rectification Buck-Boost Digital Power Supply Based on STM32
Electronics / Circuits

Synchronous Rectification Buck-Boost Digital Power Supply Based on STM32

This article presents an open-source four-switch Buck-Boost digital power supply based on STM32G474, supporting Type-C PD and DC input up to 48V10A and 450W. It includes schematic, PCB, firmware, and 3D model files. The design offers adjustable output, OLED display, protections, and host monitoring, achieving up to 94.3% efficiency and low ripple. Users can access calculations and source code.

发布于 2024-11-12

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