Electricity: motive power systems – Braking – Plural – diverse or diversely controlled braking means
Patent
1996-02-12
1998-01-06
Ip, Paul
Electricity: motive power systems
Braking
Plural, diverse or diversely controlled braking means
318375, 318373, 318380, H02P 308
Patent
active
057059039
ABSTRACT:
An electric brake circuit (10) for bringing an alternating current (AC) motor (12) to a rapid halt. When the AC motor is turned on, a braking capacitor (C1) is charged to a preselected voltage. A shunt regulator (18) prevents the braking capacitor from overcharging by shunting charging current to ground once the braking capacitor reaches the preselected voltage. In a preferred embodiment, a limit circuit (20) turns off the charging current on the subsequent positive phase of the AC line voltage powering the electric brake. By shutting off current flow to the circuit when the preselected voltage on the capacitor is reached, power consumption and size of the circuit are minimized.
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Ip Paul
Unicoil, Inc.
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