Electricity: motive power systems – Automatic and/or with time-delay means – Terminal voltage or counter-electromotive force of...
Patent
1985-09-19
1986-10-14
Miska, Vit W.
Electricity: motive power systems
Automatic and/or with time-delay means
Terminal voltage or counter-electromotive force of...
318782, 318813, 361 91, H02H 320
Patent
active
046175016
ABSTRACT:
A control system for electrically powering from an external alternating-current power source a direct-current underwater hand-operated tool or light activated by a switch. The control system includes a relay for connecting and disconnecting the external AC power source to and from the system, a transformer connected to the relay for transforming the AC power to a desired lower voltage level, a converter connected to the transformer for converting the transformed AC to DC power, cables for supplying the DC power to the tool, and a control circuit for sensing the voltage level of the transformed AC power and in response to the sensed voltage level increasing beyond a predetermined safe level, causing the relay to disconnect the external AC power source from the system. The control includes a Zener diode for sensing the voltage level of the transformer AC power, and a transistor and an SCR for controlling the operation of the relay. The transistor is responsive to the conductive state of the SCR and provides drive to the coil of the relay. When the sensed voltage level of the transformed AC power increases above the predetermined level, the SCR is placed in a conductive state, inhibiting base drive to the transistor to deactivate the relay coil and open the relay for disconnecting the external AC power source from the system.
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Foreman Douglas
Gieser John D.
Miska Vit W.
Ro Bentsu
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