Electricity: motive power systems – Braking – Automatic and/or with time-delay means
Patent
1979-08-14
1981-08-11
Smith, Jr., David
Electricity: motive power systems
Braking
Automatic and/or with time-delay means
318532, H02P 516
Patent
active
042836670
ABSTRACT:
Disclosed is an exciter circuit for an electrical load such as the field winding of a direct current (DC) motor. The exciter circuit regulates the DC current applied to the load from an alternating current (AC) source in response to an isolated feedback signal developed by means of a saturating square loop current transformer. The current signal developed is compared against a signal corresponding to the desired current value and an error signal is generated which is fed to photo-optical firing circuit means which are coupled to and operative to control at least one thyristor (SCR) which, when rendered conductive, is adapted to provide a freewheeling current path for the load current during the half cycle of the AC line voltage when it is disconnected from the load by at least a half wave rectifier. The present invention includes embodiments for both single and bidirectional current flow through the load which, as noted above, preferably comprises the field winding of a DC motor.
REFERENCES:
patent: 3675105 (1972-07-01), Petigalla
patent: 3696288 (1972-10-01), Carman
patent: 4027220 (1977-05-01), Wilckerson
patent: 4074175 (1978-02-01), Born et al.
patent: 4096423 (1978-06-01), Bailey et al.
patent: 4191914 (1980-03-01), Lecluse
General Electric Company
Renner Arnold E.
Smith Jr. David
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