Battery Cell Tester Reference Design

Want correct present and voltage management for battery testing or energy provides? This reference design solves regulation errors and startup points—see extra!

The TIDA-010090 reference design from Texas Devices (TI) supplies design engineers with an answer for exact present and voltage management in a bidirectional buck converter energy stage. Utilizing a C2000 real-time microcontroller (MCU) and a precision ADC ADS8588S, this design achieves a present regulation error of lower than ±10mA and a voltage regulation error of ±1mV by leveraging the high-resolution pulse-width modulation (PWM) peripheral of the C2000 MCU. This reference design is especially helpful for battery cell formation, check tools, and programmable DC energy provides.

Engineers on battery testing programs can use this design to develop tools able to evaluating single cells, battery modules, and high-voltage battery packs. These programs require precision energy provides and information acquisition capabilities to assist charging, discharging, and parameter measurement. The reference design additionally helps the formation stage of Li-Ion battery manufacturing, the place managed cost and discharge cycles create the stable electrolyte interface (SEI) layer, a key think about battery efficiency and longevity. Battery formation programs constructed utilizing this design can obtain voltage and present accuracy between ±0.02% and ±0.05% of full scale.

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The design allows engineers to implement a high-resolution PWM management system utilizing the TMS320F28P650DK MCU, which manages present and voltage regulation. The INA241 present sense amplifier measures battery present, whereas the OPA2186 operational amplifier measures battery voltage. The ADS8588S ADC converts these indicators into digital information for exact management, and the C2000’s on-chip window comparators present overcurrent safety.

The design employs a cascaded voltage and present loop for constant charging and discharging management. When the battery voltage is considerably under the constant-voltage setting (VSET), the voltage loop maintains a constant-current setting (ISET). Because the voltage nears VSET, the system reduces ISET to stop overshooting the voltage restrict. This method ensures dependable operation in each cost and discharge modes, with VSET as a safeguard towards overcharging and extreme discharge.

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To stop present overshoot throughout startup, engineers can implement one among two strategies. The primary technique entails preserving the output relay open till the buck converter reaches a voltage near the battery voltage, stopping sudden inrush currents. The second technique begins the buck converter in discontinuous conduction mode (DCM), preserving the low-side swap OFF throughout charging or the high-side swap OFF throughout discharging earlier than transitioning to synchronous mode utilizing a timer.

TI has examined this reference design. It comes with a invoice of supplies (BOM), schematics, meeting drawing, printed circuit board (PCB) format, and extra. The corporate’s web site has further information in regards to the reference design. To learn extra about this reference design, click on right here.