Surge protection circuit

An electronic circuit comprising:

• a common power bus;
• a first power bus having a first voltage potential with respect to the common power bus;
• a plurality of power lines configured to provide power from the first power bus to a plurality of load devices coupled between the plurality of power lines and the common power bus;
• a surge protection circuit comprising:
• a first SPD;
• a second SPD coupled to the first SPD via a second voltage potential distinct from the first voltage potential;
• a diode array comprising:
• a first subset of diodes coupled between the plurality of power lines and the first SPD;
• a second subset of diodes coupled between the plurality of power lines and the second SPD;
• wherein the second terminal of the first SPD is further coupled to the common power bus.

A method of protecting an electronic circuit having a common power bus, a first power bus having a first voltage potential with respect to the common power bus, and a plurality of power lines providing power from the first power bus to a plurality of load devices coupled between the plurality of power lines and the common power bus, the method comprising:

• coupling a diode array to the plurality of power lines;
• coupling a first SPD to the diode array, to a second voltage potential distinct from the first voltage potential, and to the common power bus;
• and
• coupling second SPD to the diode array and to the second voltage potential.