Surge suppression on AC power lines
First Claim
1. A surge suppression network comprising:
- a first circuit consisting of;
a solid state voltage clamping means for clamping a supply voltage to below a specific level upon continued application of a transient surge in excess of a clamping voltage of said clamping means; and
a trigger means electrically connected in parallel to said voltage clamping means; and
a crowbar means for entering a low impedance state upon application of a transient surge in excess of a breakdown voltage of said crowbar means, said crowbar means being serially connected to said first circuit to form a second circuit and said second circuit being electrically connected across a voltage supply, said crowbar means being switched to said low impedance state by said trigger means when a transient surge in excess of said breakdown voltage is applied to said second circuit and said crowbar means and said clamping means clamping said transient surge to a voltage equal to the sum of said clamping voltage and the voltage across said crowbar means in it low impedance state.
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Accused Products
Abstract
A triggered surge suppression network is disclosed comprising a low voltage clamping device, a crowbar device and a trigger device. The voltage clamping device and the trigger device are connected in parallel; and these devices are connected in series to the crowbar device. The resulting circuit is connected across a voltage supply, in parallel to a load. The trigger device causes the crowbar device to break down at a pre-set value and discharge the energy of the surge through the low voltage clamping device. The breakdown voltage of the network will depend essentially on the breakdown voltage of the crowbar device while the peak voltage supplied to the load during the surge will independently be determined by the clamping voltage of the voltage clamping device.
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Citations
18 Claims
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1. A surge suppression network comprising:
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a first circuit consisting of; a solid state voltage clamping means for clamping a supply voltage to below a specific level upon continued application of a transient surge in excess of a clamping voltage of said clamping means; and a trigger means electrically connected in parallel to said voltage clamping means; and a crowbar means for entering a low impedance state upon application of a transient surge in excess of a breakdown voltage of said crowbar means, said crowbar means being serially connected to said first circuit to form a second circuit and said second circuit being electrically connected across a voltage supply, said crowbar means being switched to said low impedance state by said trigger means when a transient surge in excess of said breakdown voltage is applied to said second circuit and said crowbar means and said clamping means clamping said transient surge to a voltage equal to the sum of said clamping voltage and the voltage across said crowbar means in it low impedance state. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A triggered surge suppression network comprising:
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a trigger capacitor; a varistor having a clamping voltage and connected in parallel to said trigger capacitor; a gas tube having a breakdown voltage and connected in series with the parallel combination of said capacitor and said varistor; said network upon application of a transient surge in excess of the breakdown voltage clamping a supply voltage to approximately said clamping voltage, said clamping voltage being less than said breakdown voltage. - View Dependent Claims (18)
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Specification