Circuit and method for wetting relay contacts
First Claim
1. A circuit for wetting relay contacts, the circuit comprising:
- a relay having a relay coil, a movable contact and a stationary contact, the movable contact being movable between an open position and a closed position upon energizing of the relay coil, the movable contact engages the stationary contact in the closed position, the movable contact being moved from the closed position to the open position when the relay coil is de-energized;
a transistor connected to the movable contact and a load; and
a resistor connected to the transistor and the relay that senses voltage drop at the relay coil and turns on the transistor to load the movable contact after the relay is de-energized to provide an arc between the movable contact and the stationary contact as the movable contact is moved from the closed position to the open position.
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Accused Products
Abstract
A circuit for wetting relay contacts includes a relay having a relay coil, a movable contact and a stationary contact. The movable contact is movable between an open position and a closed position upon energizing of the relay coil, and the movable contact engages the stationary contact in the closed position. The movable contact is moved from the closed position to the open position when the relay coil is de-energized. A transistor is connected to the relay coil through a load, wherein the transistor loads the relay coil after the relay coil is de-energized to provide an arc between the movable contact and the stationary contact as the movable contact is moved from the closed position to the open position.
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Citations
18 Claims
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1. A circuit for wetting relay contacts, the circuit comprising:
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a relay having a relay coil, a movable contact and a stationary contact, the movable contact being movable between an open position and a closed position upon energizing of the relay coil, the movable contact engages the stationary contact in the closed position, the movable contact being moved from the closed position to the open position when the relay coil is de-energized; a transistor connected to the movable contact and a load; and a resistor connected to the transistor and the relay that senses voltage drop at the relay coil and turns on the transistor to load the movable contact after the relay is de-energized to provide an arc between the movable contact and the stationary contact as the movable contact is moved from the closed position to the open position. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A circuit for wetting relay contacts, the circuit comprising:
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a relay having a relay coil, a movable contact and a stationary contact, the relay coil configured to move the movable contact between an open position and a closed position upon energizing and de-energizing of the relay coil; and a transistor connected to the relay, the transistor being positioned between the movable contact and a ground through a load, wherein the load comprises at least one of a resistor, an inductor and a capacitor, and wherein the transistor loads the relay contact after the relay coil is de-energized to provide an arc between the movable contact and the stationary contact as the movable contact is moved from the closed position to the open position. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. A method of wetting relay contacts comprising;
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providing an electromechanical relay having a coil, a movable contact and a stationary contact; energizing the coil to move the movable contact to a closed position in contact with the stationary contact; de-energizing the coil to allow the movable contact to move to an open position; and maintaining a load on at least one of the movable contact and the stationary contact after the relay is de-energized using a wetting circuit having a transistor by sensing a voltage drop at the coil and providing a current path from the transistor to the relay when the voltage drop is sensed. - View Dependent Claims (18)
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Specification