CUKTECH 10 Super Magnetic Power Card Teardown

An accidental mishap led to a rather fascinating teardown. I never imagined I'd end up blowing up a power bank! While disassembling the CUKTECH 10 Super Magnetic Power Card, I accidentally punctured the lithium battery, which instantly resulted in smoking, ignition, and complete combustion, leaving behind a pile of "remains." I must say, experiencing the power of a lithium battery burning up close for the first time was extremely shocking. If I hadn't reacted quickly, I might be in the hospital right now. The picture below shows the Power Card before the incident—brand new, sleek, and its performance and functionality are indeed commendable.

The following image shows the two mainboards salvaged after the fire, now carrying a distinct "character"—a faint burnt smell that lingers every time you get close, an unforgettable reminder. Although charred, they are still usable for examining the internal hardware design.

After cleaning off the ashes, we are left with two mainboards, which can be simply understood as the wired charging control board and the wireless charging control board.

First, let's look at the wired charging control board with the Type-C port.

The primary chip is from INJOINIC, the IP5385. As the main control chip for the power bank, it fully supports the UFCS fusion fast charging protocol and is compatible with various mainstream fast charging standards, along with BC1.2 charging for Apple devices. The chip integrates a synchronous bidirectional buck-boost converter, a lithium battery charging management module, and a power level indicator. Its high level of integration significantly simplifies the peripheral circuitry; only one inductor is needed to build a complete bidirectional buck-boost system, which greatly reduces the overall size of the solution and offers clear advantages in lowering BOM costs.

Next to the main control are two power regulation chips, but they are burnt, and the model numbers are unidentifiable. Surrounding the 4.7μH chip inductor are four CQY7534N​ NMOS transistors from CQAOS​, serving as the synchronous buck-boost switching transistors.

On the back of the wired charging control board is the screen, one of its signature features. It can display real-time information like battery level, input/output power, remaining charging/discharging time, and port status, making it much smarter than traditional power banks.

This side of the PCB also includes another CQY7534N​ NMOS transistor from CQY, acting as the VBUS switch for the USB-C port. There's also a lithium battery protection chip, the CM1025-QA​ from iCM. It incorporates high-precision voltage and current detection circuits and supports protection against over-charging, over-discharging, over-current during discharge, short circuits, and over-current during charging. Next to the PCB are two more lithium battery protection chips, also burnt beyond recognition.

Now, let's examine the wireless charging control board from the power bank.

In the middle of the PCB is the wireless charging main control chip, the IP6823​ from INJOINIC. This is a Qi-standard compliant transmitter control chip with a high level of integration, incorporating a full H-bridge driver, an ASK communication demodulation module, and adapter fast-charging sink protocols. It supports customization for charging protocols, FOD sensitivity, and indicator status, offering good design flexibility. Next to it are two wireless charging power transistors, the AP20G02BDF​ N+P dual MOSFETs from APM, suitable for full-bridge wireless charging applications.

The other side of the PCB houses the control and screen circuitry, including a touch chip and a microcontroller, the CH32X035F8U6​ from WCH. This MCU uses an open RISC-V processor core, integrating 62KB of flash memory and 20KB of RAM. In terms of integrated features, it includes a high-precision ADC module, operational amplifiers, and complete USB and PD protocol physical layer circuits. Beyond these basic functions, this chip can directly drive the display, enabling rich human-machine interaction features.

The back of the wireless charging control board includes two more CQY7534N​ NMOS transistors from CQAOS, which serve as the VBUS switches controlling the power supply to the wireless charging system. This basically covers the main components left on the two PCBs of the Power Card; other information, like the battery, was lost in the fire.

The main chip BOM involved is as follows:

The above is the teardown of the CUKTECH Power Card. Apart from the heart-pounding experience of accidentally puncturing the battery causing it to combust, the internal all-domestic chip solution is quite noteworthy. From the core INJOINIC power management and wireless charging controllers, to Chuangxin Micro's battery protection chip, and Qinheng's RISC-V core MCU, domestic chips achieve full-chain coverage in this power bank. This collaborative advantage allows OEMs to create competitive products based on domestic chips, reducing complete reliance on imported solutions. Furthermore, the high cost-effectiveness and localized technical support of domestic chips enable faster product iteration and lower R&D costs for manufacturers. This ecosystem, where companies "step on each other's feet and borrow strength to move forward together," can undoubtedly further expand the scale of China's semiconductor industry, which I think is excellent. What do you think? Feel free to leave a comment and discuss