The operation of a motor control device, commonly
used on forklifts, front end loaders, small utility vehicles utilizing
thyristors, can cause a negative spike to be generated. Any electronics
sharing a common power system can be affected by these negative spikes.
Analytic Systems has developed a modification to prevent these negative
spikes from accidentally shutting down power conversion units. We are
often called upon to supply fully isolated DC-DC converters to produce
15 - 16 volts DC, at 5 to 7 amps from forklifts, 36 or 48 volts DC to
run notebook computers.
Our customers include GE, Walmart, Crown, US Navy,
Raymond, BC Hydro, Oshkosh, NBC, Duke Energy.
The ‘Forklift’ Modification
These are particularly tough applications, as the thyristor-based motor
drives for the forks and tires produce large amounts of overlying AC on
the batteries, and will cause many converters to fail unless proper
input-circuitry is used. We call this the ‘Forklift’ Modification.