Ground fault detection circuit
First Claim
Patent Images
1. A ground fault detection circuit comprising:
- a fuse; and
a fuse detect circuit coupled in parallel with the fuse, the fuse detect circuit including an isolated DC or AC source arranged to inject a sensing current into the fuse and detection means arranged to detect the sensing current that was injected into the fuse and that has passed through the fuse or a signal indicative thereof;
the fuse and the fuse detect circuit being arranged to be coupled between a reference point and a second point of a monitored circuit for which ground faults are to be detected;
wherein the fuse detect circuit is further arranged to;
detect a fuse break indicative of a ground fault condition; and
disable at least a portion of the monitored circuit.
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Abstract
A ground fault detection circuit comprising a fuse and a fuse detect circuit. The fuse and the fuse detect circuit are arranged to be coupled in parallel between a reference point and a second point of a monitored circuit for which ground faults are to be detected. The fuse detect circuit is further arranged to detect a fuse break indicative of a ground fault condition and disable at least a portion of the monitored circuit.
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Citations
18 Claims
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1. A ground fault detection circuit comprising:
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a fuse; and a fuse detect circuit coupled in parallel with the fuse, the fuse detect circuit including an isolated DC or AC source arranged to inject a sensing current into the fuse and detection means arranged to detect the sensing current that was injected into the fuse and that has passed through the fuse or a signal indicative thereof; the fuse and the fuse detect circuit being arranged to be coupled between a reference point and a second point of a monitored circuit for which ground faults are to be detected;
wherein the fuse detect circuit is further arranged to;detect a fuse break indicative of a ground fault condition; and disable at least a portion of the monitored circuit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 16)
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12. A method of detecting a ground fault comprising:
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detecting a break in a fuse indicative of a ground fault condition with a fuse detect circuit coupled in parallel with the fuse, the fuse detect circuit having detection means to detect a sensing current injected into the fuse from an isolated DC or AC source and that has passed through the fuse or a signal indicative thereof, the fuse and the fuse detect circuit arranged to be coupled between a reference point and a second point of a monitored circuit; and disabling at least a portion of the monitored circuit in response to detecting the fuse break condition. - View Dependent Claims (13, 14, 15, 17, 18)
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Specification