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US 4,048,664 AGranted
Protective circuit for dynamic braking resistors
AssigneeMosebach Manufacturing Company
InventorVictor V. Kirilloff
Life of this patent
Estimating the term…
Abstract
A circuit for protecting a pair of dynamic brake resistors when either of two motors driving fans for cooling the resistors fails. A sensing circuit couples the terminal of the two motors to a switch circuit. The sensing circuit reduces the energy to the switch circuit which removes power to the resistors when the sensing circuit senses a failure in one of the motors.
Claims6
A circuit for protecting a pair of dynamic brake resistors when either of two motors driving fans for cooling the resistors fails, comprising:
- a. a sensing circuit means having an input coupled to terminals of each of the motors and an output coupled to the input through voltage dropping impedances so as to substantially reduce the electrical energy from the input to the output;
- and
- b. a switch means coupled to the output of the sensing circuit means, the switch means removes power to the dynamic brake resistors when the output from the sensing circuit reaches a certain level thereby protecting the resistors from overheating when there is a failure of either motor driving the cooling fans.
Dependencies are inferred from the claim text.