Sub-μA current sensor based on Kinetis K22F

The Sub-μA Current Sensor is a Kinetis K22F based current measurement board running on FreeRTOS and can be used with the Freedom Development Ecosystem or any other Arduino-like development board.

This reference design allows for non-intrusive connection between any MCU and a 3.3V shield and measurement of a wide range of low currents (~60 nA – 5 mA). Multiple communication methods are available, including integration with Freedom Sensor Toolbox (CE).

Schematic PCB

smart meter

Smart Energy Gateway

Smart gas meter/water meter

Grid concentrator

Electric bike charger

Shared power bank

Transformer Terminal Unit (TTU)

Solar inverters

First generation electric vehicle power inverter control reference platform

Open source lithium battery management board, charging 5V2A, discharging 5V/1.52A or 12V/0.76A

This DIY LiPo super charger can charge a single LiPo battery and protect it from overvoltage, overload and short circuit. In addition, it can boost the battery voltage to 5 V or 12 V. The boosted output voltage is protected by an "eFuse" IC with a maximum output current of 1.52 A at 5 V and 0.76 A at 12 V. The charger part of the circuit requires a +5V power supply, which can be connected via USB-C, or simply solder two wires to pads on the PCB. Additionally, other connections can be soldered to pads on the PCB or use individual pin headers.

Schematic PCB

Voltage sampling module based on VSM025A

Introduction: Voltage sampling module based on VSM025A

Schematic PCB

2017 Electrical Contest Question K-Analysis of Single-Phase Electrical Appliances-Design Plan and Report (3 National Awards)

Schematic PCB

2017 Electronic Competition H Question-Remote Amplitude-Frequency Characteristics Test Device-Design Plan and Report (3 National Awards)

Schematic PCB

2017 Electric Power Competition Question A-Microgrid Simulation System-National First Report + Schematic Diagram + Simulation Document (Changsha University of Science and Technology)

Schematic PCB

2018 Electronic Competition Question E-Energy Recovery Device (Xidian University)

Schematic PCB

2021 College Student Electronic Design Contest Topic H Outstanding Works Collection (Electrical Appliance Analysis and Identification Device)

Schematic PCB

2021 College Student Electronic Design Competition Topic C Outstanding Works Collection (Three-Port DC-DC Converter)

Schematic PCB

2021 College Student Electronic Design Competition Topic B Outstanding Works Collection (Three-Phase AC-DC Conversion Circuit)

Schematic PCB

Open source 60W small UPS power supply reference design

Ideal for running network devices such as small switches, home routers, and WLAN access points.

Schematic PCB