A Versatile Power Supply in Your Pocket——Come and Support It！

PocketPD, a highly compact desktop power supply designed to fit snugly in one hand and easily slip into a pocket for ultimate portability. Despite its small size, it’s loaded with advanced features that deliver a wide voltage range while ensuring user safety. In addition to its fundamental functions, PocketPD comes equipped with an OLED display, a current sensor, and a banana plug output, enabling seamless integration with various standard devices like modern USB-C chargers or power banks. Moreover, it includes an additional feature that serves as a Power Delivery 3.0 profile tester.

PocketPD leverages the Programmable Power Supply (PPS) mode in USB Power Delivery 3.0 and subsequent versions, allowing users to directly extract voltage and current from the charger. The designer aimed to create an open-source solution that addresses user needs, prioritizing ease of use and portability. Featuring physical buttons and a clear display, users can begin utilizing it simply by connecting a compatible charger or power bank, eliminating the need for complicated setups. Its multifunctionality, simplicity, and compact design make PocketPD an excellent addition to the toolkits of both professionals and beginners alike.

Main Design Elements

The heart of PocketPD lies in its foundation on the Programmable Power Supply (PPS) mode, which debuted in 2015. It’s crucial for users to verify their charger or power bank’s compatibility with this mode. PPS was initially developed to enhance smartphone battery charging, offering precise control over voltage and current levels, making it perfect for desktop power supply applications. Many contemporary chargers and power banks, including reputable brands such as Anker, Ugreen, Baseus, and CUKTECH, now support PPS. If users are uncertain about compatibility, they should consult the relevant device’s manual.

It’s worth noting that the maximum voltage and current output of PocketPD depend on the USB Type-C charger and cable used: the power output specifications will be capped by the lowest current rating between the charger and cable. For instance, if the charger supports 5A but a 3A cable is employed, the maximum current output will be 3A. Similarly, the voltage range provided by the charger determines the available output voltage range of PocketPD, typically ranging from 3.3V to 11V and 3.3V to 21V.

Features & Specifications

• Input: USB Type-C, compliant with PD 3.0
• Output: 0-20 V @ 0-5 A (adjustable)
• Modes: Constant Voltage (CV), Constant Current (CC)
• Display: 0.96-inch OLED display
• Microcontroller: Raspberry Pi RP2040 Cortex M0+
• Protocol IC: AP33772 USB PD sink controller
• Safety Features: Short circuit, reverse current, fly-back diode protection
• Dimensions: 87 x 62 x 25.5 mm (3.43 x 2.44 x 1 in)
• Weight: 81 g (2.87 oz)

This project is set to launch on CrowdSupply, so check out PocketPD for more information. Feel free to support it if you find it interesting.