Reduced let through voltage transient protection or suppression circuit
View Patent ↗A low let-through voltage surge suppression or protection circuit for protecting hardware or equipment from electrical surges. During operation when no surge condition is present, the circuit allows propagation of signals from a source to a load along a signal path. When a surge is present, the circuit senses and diverts the surge away from the signal path, utilizing common mode and/or differential mode surge protection. An electronic filter is connected in parallel with surge suppression circuit elements for reducing the let through voltage that would otherwise propagate and require a higher power surge suppression circuit element to mitigate. Cascading multiple electronic filters in parallel with surge suppression circuit elements further reduces voltage let through.
1. A surge protection device comprising:
an advanced transient avalanche charger (ATAC) filter circuit including
an input node;
an output node;
a capacitor;
a resistor connected in parallel with the capacitor; and
a diode having a first terminal connected to the input node and a second terminal connected in series with the capacitor and the resistor.
2. The device of claim 1 wherein the ATAC filter circuit further comprises a second SAD having a first terminal connected to the output node and a second terminal connected in series with the capacitor and the resistor.
3. The device of claim 1 wherein the ATAC filter circuit is connected in parallel with a surge element.
4. The device of claim 1 wherein the input node of ATAC filter circuit is connected to a first signal line and the output node of the ATAC filter circuit is connected to a second signal line.
5. The device of claim 1 wherein the input node of the ATAC filter circuit is connected to a signal line and the output node of the ATAC filter circuit is connected to a ground.
6. The device of claim 1 further comprising a first input port and a second input port, wherein the ATAC filter circuit is connected between the first input port and the second input port.
7. The device of claim 6 further comprising a surge element connected in parallel with the ATAC filter circuit.
8. A low let-through voltage surge suppression or protection apparatus comprising:
a first signal port;
a second signal port;
a ground connection;
a first surge protection filtering device electrically connected between the first signal port and the second signal port for reducing a let through voltage, the first surge protection filtering device including
a first silicon avalanche diode (SAD),
a first capacitor connected to the first SAD, and
a first resistor connected to the first SAID and connected in parallel with the first capacitor;
a first surge element electrically connected between the first signal port and the second signal port in parallel with the first surge protection filtering device;
a second surge protection filtering device electrically connected between the first signal port and the ground connection for reducing a let through voltage, the second surge protection filtering device including
a second SAD,
a second capacitor connected to the second SAD, and
a second resistor connected to the second SAD and connected in parallel with the second capacitor;
a second surge element electrically connected between the first signal port and the ground connection in parallel with the second surge protection filtering device;
a third surge protection filtering device electrically connected between the second signal port and the ground connection for reducing a let through voltage, the third surge protection filtering device including
a third SAD,
a third capacitor connected to the third SAD, and
a third resistor connected to the third SAD and connected in parallel with the third capacitor; and
a third surge element electrically connected between the second signal port and the ground connection in parallel with the third surge protection filtering device.
9. The low let-through voltage surge suppression or protection apparatus of claim 8 further comprising a housing defining a cavity therein, wherein the first signal port, second signal port, and ground connection are connected to the housing.
10. The low let-through voltage surge suppression or protection apparatus of claim 9 wherein the first, second and third surge protection filtering devices, and the first, second and third surge elements are located within the cavity.
11. The low let-through voltage surge suppression or protection apparatus of claim 8 wherein
the first surge protection filtering device further includes a fourth SAD connected to the first resistor and the first capacitor,
the second surge protection filtering device further includes a fifth SAD connected to the second resistor and the second capacitor, and
the third surge protection filtering device further includes a sixth SAD connected to the third resistor and the third capacitor.
12. The low let-through voltage surge suppression or protection apparatus of claim 8 wherein the first surge element, the second surge element and/or the third surge element are selected from a group consisting of an SAD, a metal oxide varistor (MOV), and a gas discharge tube (GDT).
13. The low let-through voltage surge suppression or protection apparatus of claim 11 further comprising a fourth surge protection filtering device electrically connected in parallel with any of the first surge protection filtering device, the second surge protection filtering device or the third surge protection filtering device for further reducing a let through voltage, the fourth surge protection filtering device including
a fourth SAD,
a fourth capacitor connected to the fourth SAD, and
a fourth resistor connected to the fourth SAD and connected in parallel with the fourth capacitor.
14. A low let-through voltage surge suppression or protection apparatus comprising:
a first input port;
a second input port;
a first output port;
a second output port;
a first inductor electrically connected between the first input port and the first output port;
a second inductor electrically connected between the second input port and the second output port;
a ground port;
a first surge protection filtering device electrically connected between the first input port and the second input port for reducing a let through voltage;
a first surge element electrically connected between the first input port and the second input port in parallel with the first surge protection filtering device;
a second surge protection filtering device electrically connected between the first input port and the ground port for reducing a let through voltage;
a second surge element electrically connected between the first input port and the ground port in parallel with the second surge protection filtering device;
a third surge protection filtering device electrically connected between the first output port and the ground port for reducing a let through voltage;
a third surge element electrically connected between the first output port and the ground port in parallel with the third surge protection filtering device;
a fourth surge protection filtering device electrically connected between the second input port and the ground port for reducing a let through voltage;
a fourth surge element electrically connected between the second input port and the ground port in parallel with the fourth surge protection filtering device;
a fifth surge protection filtering device electrically connected between the second output port and the ground port for reducing a let through voltage;
a fifth surge element electrically connected between the second output port and the ground port in parallel with the fifth surge protection filtering device;
a sixth surge protection filtering device electrically connected between the first output port and the second output port for reducing a let through voltage; and
a sixth surge element electrically connected between the first output port and the second output port in parallel with the sixth surge protection filtering device.
15. The low let-through voltage surge suppression or protection apparatus of claim 14 wherein the first surge protection filtering device, the second surge protection filtering device, the third surge protection filtering device, the fourth surge protection filtering device, the fifth surge protection filtering device and the sixth surge protection filtering device each include
a silicon avalanche diode (SAD),
a capacitor connected to the SAD, and
a resistor connected to the SAD and connected in parallel with the capacitor.
16. The low let-through voltage surge suppression or protection apparatus of claim 14 wherein the first surge protection filtering device, the second surge protection filtering device, the third surge protection filtering device, the fourth surge protection filtering device, the fifth surge protection filtering device and the sixth surge protection filtering device each include
a first silicon avalanche diode (SAD),
a capacitor connected to the SAD,
a resistor connected to the SAD and connected in parallel with the capacitor, and
a second SAD connected to the capacitor and the resistor.
17. The low let-through voltage surge suppression or protection apparatus of claim 15 wherein the first surge element, the second surge element, the third surge element, the fourth surge element, the fifth surge element and/or the sixth surge element are selected from a group consisting of a silicon avalanche diode (SAD), a metal oxide varistor (MOV), and a gas discharge tube (GDT).
18. The low let-through voltage surge suppression or protection apparatus of claim 15 further comprising a seventh surge protection filtering device electrically connected in parallel with any of the first surge protection filtering device, the second surge protection filtering device, the third surge protection filtering device, the fourth surge protection filtering device, the fifth surge protection filtering device or the sixth surge protection filtering device for further reducing a let through voltage, the seventh surge protection filtering device including
a second silicon avalanche diode (SAD),
a second capacitor connected to the second SAD, and
a second resistor connected to the second SAD and connected in parallel with the second capacitor.
19. The low let-through voltage surge suppression or protection apparatus of claim 14 further comprising a printed circuit board (PCB), wherein the first and second inductors, the first, second, third, fourth, fifth, and sixth surge protection filtering devices, and the first, second, third, fourth, fifth, and sixth surge elements are disposed on the PCB.
20. The low let-through voltage surge suppression or protection apparatus of claim 19 , further comprising a housing defining a cavity therein, wherein the first and second input ports and the first and second output ports are connected to the housing, and the PCB is housed within the cavity.