DEVICE FOR PROTECTION AGAINST ELECTROSTATIC DISCHARGES
The present description concerns a device of protection against electrostatic discharges including: at least one first rectifying element including an anode connected to a first terminal and a cathode connected to a first node of the device; at least one second rectifying element including an anode connected to a second node of the device and a cathode connected to the first terminal; and at least one Zener diode or at least one Shockley diode series-connected with a capacitive element between the first and second nodes.
1 . A device, comprising:
a first node;
a second node;
one or more first terminals;
at least one first rectifying element including an anode connected to the first terminal and a cathode connected to the first node;
at least one second rectifying element including an anode connected to the second node and a cathode connected to the at least one first terminal; and
at least one Zener diode or at least one Shockley diode series-connected with a capacitive element between the first and second nodes, wherein the capacitive element is a capacitor comprising a first electrically conductive electrode and a second electrically conductive electrode separated from the first electrically conductive electrode by a dielectric material.
2 . The device according to claim 1 , wherein the first and second rectifying elements are diodes.
3 . The device according to claim 1 , wherein the first and second rectifying elements each include a thyristor and a diode coupling an anode gate of the thyristor to a cathode of the thyristor.
4 . The device according to claim 1 , comprising:
a second terminal;
a single first rectifying element;
a single second rectifying element;
a third rectifying element including an anode connected to the second terminal and a cathode connected to the first node; and
a fourth rectifying element including an anode connected to the second node and a cathode connected to the second terminal.
5 . The device according to claim 4 , wherein the second terminal is a terminal of application of a reference potential.
6 . The device according to claim 1 , comprising at least two branches each including a single first rectifying element, a single second diode, and a single first terminal distinct from the first rectifying elements, from the second rectifying elements, and from the terminals of the other branches.
7 . The device according to claim 6 , comprising a third terminal of application of a reference potential, wherein one of the first terminals is connected to the third terminal.
8 . The device according to claim 1 , wherein the at least one Zener diode or at least one Shockley diode is a single Zener diode.
9 . The device according to claim 8 , comprising a third node, wherein the Zener diode includes an anode connected to the third node and a cathode connected to the first node, the capacitive element including a first terminal connected to the third node and a second terminal connected to the second node.
10 . The device according to claim 8 , wherein the Zener diode includes an anode connected to the second node and a cathode connected to a third node, the capacitive element including a first terminal connected to the third node and a second terminal connected to the first node.
11 . The device according to claim 1 , wherein the at least one Zener diode or at least one Shockley diode is a single Shockley diode.
12 . The device according to claim 1 , wherein the at least one Zener diode or at least one Shockley diode includes at least two diodes Zener or at least two Shockley diodes.
13 . The device according to claim 1 , wherein the first and second terminals are configured to be connected to terminals of a Type-C USB connector.
14 . The device of claim 1 , comprising a smartphone, a connected object, a touch pad, or a Type-C USB cable.
15 . A method, comprising:
receiving, a high supply voltage at a first terminal of an electrostatic discharge protection device, the first terminal being coupled to a cathode of a first rectifying element and to an anode of a second rectifying element;
receiving a low supply voltage a second terminal of the electrostatic discharge device, the first terminal being coupled to a cathode of a third rectifying element and to an anode of a fourth rectifying element;
receiving, between the first terminal and the second terminal, an overvoltage corresponding to a voltage difference higher than a difference between the high supply voltage and the low supply voltage under normal operating conditions; and
charging, during the overvoltage event, a capacitor via a first diode having an anode coupled to a first plate of the capacitor and a cathode coupled to cathodes of the second and fourth rectifying elements, the capacitor having a second terminal separated from the first terminal by a dielectric material and coupled to anodes of the first and third rectifying elements.
16 . The method of claim 14 , wherein the first diode is a Zener diode or a Schottky diode.
17 . The method of claim 15 , wherein the first diode has a reverse triggering voltage less than double the difference between the high supply voltage and the low supply voltage under normal operating conditions.
18 . A device, comprising:
a first node;
a second node;
a pair of first diodes coupled between the first node and the second node;
a pair of second diodes coupled between the first node and the second node;
a capacitor and a third diode coupled in series between the first node and the second node, wherein the capacitor includes a first terminal coupled to the first node and a second terminal coupled to the third diode and separated from the first terminal by a dielectric material; and
a first voltage supply terminal coupled between the first diodes.
19 . The device of claim 18 , wherein the first diode is a Zener diode.
20 . The device of claim 18 , wherein the third diode is a Schottky diode.