Voltage transients
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United States of America Patent
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-
Nov 7, 1989
Grant Date -
N/A
app pub date -
Dec 2, 1985
filing date -
Dec 2, 1985
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Motor control systems having solid-state components are commonly used on industrial vehicles such as lift trucks. Such solid-state components are easily damaged by excessive transient voltages. The subject invention includes a power supply for supplying direct current to a motor circuit, wherein the direct current has a nominal direct current voltage value and as associated transient voltage component. A pulse control circuit supplies current pulses from the power supply to a motor. A sensing device controllably produces a fault signal in response to the amplitude and frequency of occurrence of the transient voltage component exceeding a predetermined maximum value. An override circuit receives the fault signal and responsively modifies the current pulses delivered from the power supply to the associated motor.
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