Safety-enhanced transformer circuit

Details Safety-enhanced transformer circuit Safety-enhanced transformer circuit

1997-04-17

1998-12-08

Leja, Ronald W.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Transformer protection

361 42, H02H 704

Patent

active

058479090

ABSTRACT:
A transformer control circuit which includes a ground fault detection circuit that detects ground fault currents in the transformer secondary and delivers a ground fault detection signal to the primary circuit. This circuit derives power from the secondary winding and transmits the ground fault detection signal through an optical isolation barrier, thus avoiding the use of an auxiliary transformer. The ground fault detection circuit further includes safety features for detecting whether AC power is being supplied without earth ground being connected, and/or whether there is an undesired electrical connection between a transformer output connection and earth ground, which would defeat the ground fault detection circuit.

REFERENCES:
patent: 4016489 (1977-04-01), Adams et al.
patent: 4507698 (1985-03-01), Nilssen
patent: 4563719 (1986-01-01), Nilssen
patent: 4613934 (1986-09-01), Pacholok
patent: 4663571 (1987-05-01), Nilssen
patent: 4675576 (1987-06-01), Nilssen
patent: 4855860 (1989-08-01), Nilssen
patent: 4939427 (1990-07-01), Nilssen
patent: 5049787 (1991-09-01), Nilssen
patent: 5089752 (1992-02-01), Pacholok
patent: 5241443 (1993-08-01), Efantis
patent: 5349273 (1994-09-01), Pacholok
patent: 5457360 (1995-10-01), Notohamiprodjo et al.
patent: 5550437 (1996-08-01), Hopkins et al.
Efantis, Tony, Ground-Fault Protection on Neon Secondaries, Signs of the Times, Jul. 1996, pp. 130-133, 188.

Affiliated with

Also associated with

Rating

Safety-enhanced transformer circuit does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Safety-enhanced transformer circuit, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Safety-enhanced transformer circuit will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-184292