Micro-electromechanical system based arc-less switching

1 . A system, comprising:

a first micro-electromechanical system switch; and

arc suppression circuitry coupled to the first micro-electromechanical system switch, wherein the arc suppression circuitry comprises a balanced diode bridge and is configured to facilitate suppression of an arc formation between contacts of the first micro-electromechanical system switch.

2 . The system of claim 1 , wherein the arc suppression circuitry is configured to facilitate suppression of an arc formation in response to an alternating current or a direct current.

3 . The system of claim 1 , wherein the balanced diode bridge comprises a first branch and a second branch, and wherein the first branch comprises a first diode and a second diode coupled in a first series circuit and the second branch comprises a third diode and a fourth diode coupled in a second series circuit.

4 . The system of claim 3 , wherein the first micro-electromechanical system switch is coupled in parallel across midpoints of the balanced diode bridge, and wherein a first midpoint is located between the first and second diodes and a second midpoint is located between the third and fourth diodes.

5 . The system of claim 1 , wherein the first micro-electromechanical system switch is integrated with the balanced diode bridge in a single package.

6 . The system of claim 1 , further comprising a load circuit coupled to the first micro-electromechanical system switch and a pulse circuit coupled to the balanced diode bridge.

7 . The system of claim 6 , wherein the pulse circuit is configured to detect a fault condition and initiate opening of the micro-electromechanical system switch responsive to the fault condition.

8 . The system of claim 1 , further comprising a mechanical switch coupled in series with the first micro-electromechanical system switch and configured to suppress leakage current in the arc suppression circuitry.

9 . The system of claim 8 , wherein the mechanical switch comprises a second micro-electromechanical system switch.

10 . The system of claim 1 , further comprising a first plurality of micro-electromechanical switches electrically coupled in a series circuit.

11 . The system of claim 10 , wherein at least one of the first plurality of micro-electromechanical switches is further coupled in a parallel circuit comprising a second plurality of micro-electromechanical switches.

12 . The system of claim 10 , further comprising a grading resistor coupled in parallel with at least one of the plurality of micro-electromechanical system switches.

13 . The system of claim 12 , further comprising a grading capacitor configured to facilitate sharing of a transient recovery voltage and coupled in parallel with at least one of the plurality of micro-electromechanical system switches.

14 . The system of claim 1 , further comprising voltage snubbing circuitry coupled in parallel with the micro-electromechanical switch and configured to limit voltage magnitude and absorb inductive energy from the load circuit.

15 . The system of claim 14 , wherein the voltage snubbing circuitry comprises a metal oxide varistor.

16 . A method for switching comprising:

applying a pulse signal to a pulse circuit having a balanced diode bridge to generate a pulse circuit current through the balanced diode bridge;

diverting a load circuit current from the micro-electromechanical system switch to the pulse circuit responsive to the pulse circuit current; and

switching the micro-electromechanical switch from a first closed state to a second open state in presence of a reduced load circuit current across the micro-electromechanical system switch.

17 . The method of claim 16 , wherein the load circuit current is diverted from the micro-electromechanical system switch to the pulse circuit without changing the load circuit current.

18 . The method of claim 16 , wherein the pulse circuit current divides equally between a first branch and a second branch of the balanced diode bridge to cause substantially equal voltage drops across the first branch and the second branch.

19 . The method of claim 16 , wherein the reduced load circuit current is non-zero.

20 . The method of claim 16 , further comprising receiving a fault signal, wherein the pulse signal is applied responsive to the fault signal.

21 . The method of claim 20 , wherein applying the pulse signal further comprises generating a resonant half sinusoid current within the pulse circuit responsive to the fault signal.

22 . The method of claim 21 , wherein applying the pulse signal comprises controlling a timing of the pulse circuit current through the balanced diode bridge to facilitate creating a lower impedance path as compared to an increasing resistance of contacts during an opening process of the micro-electromechanical switch.

23 . The method of claim 16 , wherein diverting the load circuit current comprises reducing contact pressure between contacts of the micro-electromechanical switch to facilitate initiating diversion of the load circuit current from the micro-electromechanical switch to the pulse circuit.

24 . The method of claim 23 , further comprising increasing current through a first diode in the first branch and a third diode in the second branch of the balanced diode bridge and decreasing current through a second diode in the first branch and a fourth diode in the second branch of the balanced diode bridge.

25 . The method of claim 24 , comprising switching the micro-electromechanical system switch from a first closed state to a second open state, wherein a physical gap is formed between the contacts of the micro-electromechanical switch in the second open state.

26 . The method of claim 16 , further comprising limiting voltage magnitude and absorbing inductive energy from the load circuit.

27 . The method of claim 16 , further comprising controlling a rate of voltage rise and voltage magnitude in the pulse circuit.

28 . A system comprising:

switching circuitry comprising a micro-electromechanical system switch configured to facilitate switching the system from a first state to a second state;

arc suppression circuitry coupled to the switching circuitry, wherein the arc suppression circuitry is configured to facilitate suppression of an arc formation between contacts of the micro-electromechanical system switch;

detection circuitry coupled to the arc suppression circuitry and configured to facilitate determining existence of a switch condition; and

triggering circuitry coupled to the arc suppression circuitry and the decision circuitry, wherein the triggering circuitry is configured to generate a fault signal responsive to the switch condition, and wherein the switch condition is configured to facilitate initiating opening of the micro-electromechanical system switch.

29 . The system of claim 28 , wherein the arc suppression circuitry comprises:

a balanced diode bridge, wherein the balanced diode bridge is coupled in parallel with the micro-electromechanical system switch; and

a pulse circuit coupled to the balanced diode bridge,

wherein the arc suppression circuitry is configured to facilitate suppression of an arc formation between contacts of the micro-electromechanical switch in response to an alternating current or a direct current.

30 . The system of claim 29 , further comprising a load circuit coupled to the micro-electromechanical system switch.

31 . The system of claim 28 , wherein the first state is a conducting state of the micro-electromechanical system switch and the second state is a non-conducting state of the micro-electromechanical system switch.

32 . The system of claim 28 , wherein the detection circuitry comprises sensing circuitry, wherein the sensing circuitry is configured to sense a current level, a voltage level or both.