Protector circuit
First Claim
1. A protector circuit connected between a signal line connected to a communication equipment and ground for protecting said equipment from surge voltages applied to said signal line, said signal line supplying a battery feed voltage VBf to said communication equipment, said protector circuit comprising:
- a bidirectional voltage limiting element having a breakdown voltage VB slightly higher than the battery feed voltage VBf on said signal line and lower than a predetermined non-operation voltage VA of said protector circuit; and
a bidirectional thyristor connected in series with said bidirectional voltage limiting element, the sum of the break-over voltage VB0 of said bidirectional thyristor and said breakdown voltage VB being lower than the breakdown voltage VR of said equipment and higher than said non-operation voltage VA.
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Accused Products
Abstract
A protector circuit comprises series connection of a bidirectional voltage limiting element and a bidirectional thyristor between a signal line connected to a communication equipment and ground. The breakdown voltage VB of the bidirectional voltage limiting element is set to be slightly higher than the battery feed voltage VBf on the signal line and lower than a predetermined non-operation voltage VA of the protector circuit. The sum of the breakdown voltage VB and the break-over voltage VBO of the bidirectional thyristor is set to be lower than breakdown voltage VR of the equipment and higher than the non-operation voltage VA.
63 Citations
12 Claims
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1. A protector circuit connected between a signal line connected to a communication equipment and ground for protecting said equipment from surge voltages applied to said signal line, said signal line supplying a battery feed voltage VBf to said communication equipment, said protector circuit comprising:
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a bidirectional voltage limiting element having a breakdown voltage VB slightly higher than the battery feed voltage VBf on said signal line and lower than a predetermined non-operation voltage VA of said protector circuit; and a bidirectional thyristor connected in series with said bidirectional voltage limiting element, the sum of the break-over voltage VB0 of said bidirectional thyristor and said breakdown voltage VB being lower than the breakdown voltage VR of said equipment and higher than said non-operation voltage VA. - View Dependent Claims (2, 3, 4, 5)
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6. A protector circuit connected between a signal line connected to a communication equipment and ground for protecting said equipment from surge voltages applied to said signal line, said signal line supplying a battery feed voltage VBf to said communication equipment, said protector circuit comprising:
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a first bidirectional voltage limiting element having a breakdown voltage V1 slightly higher than the battery feed voltge VBf on said signal line; a bidirectional thyristor connected in series with said first bidirectional voltage limiting element; and a second bidirectional voltage limiting element connected between the gate and anode terminals of said bidirectional thyristor; the sum of the breakdown voltages VB1 and VB2 of said first and second bidirectional voltage limiting elements and the gate-cathode voltage VGK of said bidirectional thyristor being lower than the breakdown voltage VR of said equipment and higher than a predetermined non-operation voltage VA of said protector circuit, said breakdown voltage VB2 of said second bidirectional voltage limiting element being lower than the break-over voltage VB0 of said bidirectional thyristor. - View Dependent Claims (7, 8, 9, 10)
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11. A protector circuit connected between each of a plurality of signal lines connected to a communication equipment and ground for protecting said equipment from surge voltages applied to said signal line, each of said signal lines supplying a battery feed current to said communication equipment, said protector circuit comprising:
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bidirectional thyristors connected between respective ones of said signal lines and ground and each having a holding current higher than the battery feed current to each said signal line; and bidirectional voltage limiting elements each connected between the gate and anode terminals of respective ones of said bidirectional thyristors, the sum of the breakdown voltage VB of each said bidirectional voltage limiting element and the gate-cathode voltage of each said bidirectional thyristor being higher than a predetermined non-operation voltage VA of said protector circuit and lower than the breakdown voltage VR of said equipment, said breakdown voltage VB of each said bidirectional voltage limiting element being lower than the break-over voltage VBO of each said bidirectional thyristor; the gate terminals of respective ones of said bidirectional thyristors being connected together. - View Dependent Claims (12)
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Specification