Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
169 words
In a power supply for energizing a load with alternating current, including a line wire, a return wire and a ground wire, the combination therewith of a protective system comprising: a shunt circuit connected to said line wire, said return wire and said ground wire; electronic switchover means in said shunt circuit provided with triggering means; a safety device provided with an operating element energizable through said switchover means and with a normally closed contact in said line wire; and a control circuit for operating said safety device to open said contact in the event of a malfunction, said control circuit comprising a first voltage divider inserted in series with a first diode between said line wire and said return wire, a second voltage divider inserted in series with a second diode between said line wire and said ground wire, and a connection with a pair of rectifying branches between said triggering means and respective taps of said voltage dividers, said connection including at least one electronic breakdown element.
Claim 2
Dependent Claim
169 words
In a power supply for energizing a load with alternating current, including a line wire, a return wire and a ground wire, the combination therewith of a protective system comprising: a shunt circuit connected to said line wire, said return wire and said ground wire; electronic switchover means in said shunt circuit provided with triggering means; a safety device provided with an operating element energizable through said switchover means and with a normally closed contact in said line wire; and a control circuit for operating said safety device to open said contact in the event of a malfunction, said control circuit comprising a first voltage divider inserted in series with a first diode between said line wire and said return wire, a second voltage divider inserted in series with a second diode between said line wire and said ground wire, and a connection with a pair of rectifying branches between said triggering means and respective taps of said voltage dividers, said connection including at least one electronic breakdown element.
Claim 3
Dependent Claim
68 words
The combination defined in claim 1, further comprising a first terminal connected to said line wire via said first and second diodes, a second terminal, a third diode connecting said second terminal to said return wire, and a fourth diode connecting said second terminal to said ground wire, said switchover means comprising a semiconductive device connected in series with said operating element between said first and second terminals.
Claim 4
Dependent Claim
36 words
The combination defined in claim 2 wherein said operating element is a coil, further comprising a fifth diode shunting said coil with a polarity opposing the current flow through said first, second, third and fourth diodes.
Claim 5
Dependent Claim
26 words
The combination defined in claim 1 wherein said control circuit further includes an overload-sensing resistor inserted in said line wire and connected across said triggering means.
Claim 6
Dependent Claim
39 words
The combination defined in claim 1 wherein said control circuit further comprises a differential transformer with a toroidal core traversed by said line and return wires and with a secondary winding on said core connected across said triggering means.
Claim 7
Dependent Claim
20 words
The combination defined in claim 5, further comprising a damping network inserted between said secondary winding and said triggering means.
Claim 8
Dependent Claim
25 words
The combination defined in claim 1 wherein said control circuit further includes a voltage-sensing network connected across said switchover means and to said triggering means.
Claim 9
Dependent Claim
31 words
The combination defined in claim 7 wherein said voltage-sensing network includes another breakdown element and an impedance in series therewith, said impedance being connected across said triggering means for detecting overvoltages.
Claim 10
Dependent Claim
40 words
The combination defined in claim 7 wherein said voltage-sensing network includes another breakdown element, an impedance in series therewith and a transistor with an input connection across said impedance, said transistor being connected across said triggering means for detecting undervoltages.
Claim 11
Dependent Claim
30 words
The combination defined in claim 1 wherein said line wire is one of several phase leads of a multiphase power supply, said return wire being another of said phase leads.