PCB Tech - Parameter scheme for PCB design of tablet PC

The birth of the tablet computer has prompted another major change in the world's computer technology. Due to its own portability, ultra-thin, and multi-function characteristics, it has relatively high requirements for backup power. Polymer lithium batteries are different from conventional standard cylindrical lithium batteries. They have become such high-end consumer electronic products due to their high-capacity space utilization, arbitrary size variability, ultra-thinness, high safety, and strong reliability. The first choice. With the development of tablet PCs getting higher and higher, the corresponding tablet PC PCB requirements are getting higher and higher. Let PCB designer take you to understand the tablet PC PCB design plan.

1. The design requirements of the tablet PC PCB smart battery solution:
According to customer requirements and specifications, design the tablet computer smart battery pack that matches the host computer, integrate the smart fuel gauge with communication protocol (SBS communication protocol) and battery safety protection performance into the customer's solution, which can achieve the battery pack and Host information sharing will ultimately achieve a reasonable, efficient and safe battery management program. The entire design program requires finished batteries to have the characteristics of high ultra-thinness, high capacity, high cycle life, high safety, and high consistency.
2. Specific design parameter requirements for tablet PC PCB smart battery:
1) Cell selection requirements: use domestic first-line brand polymer cells (PL5159115-2S1P/3.8Ah/3 .7V).
2) Appearance PCB design requirements: The entire product is wrapped with PET synthetic paper, which is classic and generous.
3) PCB board design requirements: accurate power management circuit + secondary overvoltage protection circuit. The SBS intelligent battery management system design scheme is adopted to effectively manage the remaining power of the battery at all times.
Third, the tablet PC PCB smart battery solution design scheme:
1) 9PIN output connection terminal: MIN connection terminal, the line type meets the customer's output current requirements. The output is defined as 3/P+, NTC, SMBC, SMBD, 3/P-, etc.
2) Smart fuel gauge to protect the tablet motherboard (PCM): Adopt SBS smart battery management system, use advanced power calculation principles to accurately calculate the battery power from time to time, and report the battery power information to the host from time to time through SMBUS, and at the same time to Rechargeable smart battery packs (generally referred to as lithium batteries) provide protection functions. Due to the chemical characteristics of lithium batteries, protection functions such as overcharge, overdischarge, short circuit, overcurrent, and overtemperature must be provided to avoid burning, explosion and other hazards.
3) Panel light computer PCB temperature protection device (one-time): The temperature protection selected for the secondary overvoltage protection in the circuit is mainly to detect the battery cell voltage, when the single cell voltage of the battery cell group is higher than 4.45V, Promote the action of the temperature protection device through the peripheral circuit, disconnect the loop, and protect the entire battery pack from overvoltage.
4) Overcurrent protection sheet (BREAKER recoverable): With overcurrent and temperature detection functions, when the current reaches 12A or the temperature reaches 75°C, the overcurrent protection sheet will act. When the temperature drops, the overcurrent protection sheet resumes normal operation.
5) PL5159115/3.8Ah/7.4V polymer lithium battery (ATL): large capacity, ultra-thin, high safety, high consistency and other characteristics.
In response to the increasingly high requirements of tablet PC PCBs,PCB has made corresponding countermeasures, which can perfectly solve the design requirements of tablet PC PCBs and all customers need for tablet PC PCB requirements.