The customer was marketing a computer system including PCs mounted on fork lifts. As the PC battery typically had a shorter operating time than what the fork lift batteries had the PC battery limited the usable operating time for the fork lift, creating a significant obstacle in selling the computer system.
The customer wanted a solution powering the PC from the fork lift battery, and made trials with some standard converters. The result was discouraging due to a number of challenges:
→ The nominal voltage for fork lift batteries varies from 12V to 110V, giving a 9V to 150V input voltage window from min voltage during discharge to max voltage during charge. This led to more variants than what was desirable for logistic reasons.
→ The electrical environment is harsh with a lot of electrical noise from the fork lift drive system and rapid voltage variations due to load changes on the fork lift battery.
→ The environment can be equally harsh with rapid and large temperature shifts, a lot of dust, vibrations, and even severe mechanical shocks when passing rails etc. in the floor.
Powerbox designed a ruggedized potted DC/ DC converter meeting all the electrical and environmental challenges. In cooperation with the customer three input voltage versions was identified as the optimized combination of product characteristics and logistics.
Powering the PC from the fork lift battery eliminated the drawback of reducing fork lift operating time. Minimizing the number of variants to three avoided logistic difficulties. The rugged design lived up to expectations and then some with zero field defects to date, minimizing service requirements.
Cases in Automotive, Industrial, Transportation
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