Battery simulator reproduces entire charge cycle

September 09, 2015 // By Graham Prophet
The Tektronix/Keithley 2281S battery simulator/precision DC power supply can the company says, shorten design and test cycles for mobile devices; the simulator is presetned as the first to emulate battery performance from full charge to total discharge

Unlike existing sources and power supplies that can only simulate a battery under one specific condition, its designers offer the Keithley battery simulator as providing the first emulation of battery performance from full charge to total discharge using a battery model that includes state of charge, amp-hour capacity, equivalent series resistance, and open circuit voltage.

The battery simulator enables design engineers to understand the load current drawn by a device in all operating states and how quickly the battery capacity declines. This is much more challenging than ever before due to the growth in wireless devices that draw very complex load currents. A battery simulator such as the 2281S that can dynamically emulate a battery is essential, Tek says, for a thorough, accurate study of device operating time between battery charges or replacement.

"The 2281S revolutionizes the way designers characterise and evaluate device performance at all stages of a battery's discharge cycle," said Mike Flaherty, general manager, Keithley product line at Tektronix. "It represents the industry's first "dynamic" battery simulator and eliminates the need for using different types of real batteries during performance testing, which greatly reduces test times and improves accuracy and flexibility. What's more, it includes a high-performance DC power supply, making the 2281S a tremendous value and a must-have tool for any designer working on a battery powered device."

Battery models that are simulated or played back by the 2281S can be obtained in a number of ways. One method is to use the instrument's battery test function to perform a full test on a battery intended for a particular design. After the test, a battery model can be generated based on the measurement results of the battery charging process. Battery models can be edited, created, imported, or exported in a CSV file format. Alternatively, a battery model can be created according to a battery's chemistry and the manufacturer's specifications.

In contrast to battery simulators intended for