Inertially operated electrical initiation devices
An electrical igniter for a munition. The igniter including: a magnet and coil wherein the magnet is configured for substantially repetitive motion in proximity to the coil to generate a voltage over a duration responsive to an acceleration of the munition; an electrical storage device configured to receive a portion of the voltage over the duration; and a circuit powered by the voltage, the circuit configured to determine an all-fire condition based on both the portion of the voltage and the duration of voltage generation and a predetermined accumulated voltage of the electrical storage device.
1. An electrical igniter for a munition, the igniter comprising:
a magnet and coil wherein the magnet is configured for substantially repetitive motion in proximity to the coil to generate a voltage over a duration responsive to an acceleration of the munition;
an electrical storage device configured to receive a portion of the voltage over the duration; and
a circuit powered by the voltage, the circuit configured to determine an all-fire condition based on both the portion of the voltage and the duration of voltage generation and a predetermined accumulated voltage of the electrical storage device.
2. The igniter of claim 1 , comprising couplings between the coil, the electrical storage device and the circuit, wherein the couplings are rigidly affixed to the igniter.
3. The igniter of claim 1 , wherein the magnet is a permanent magnet.
4. The igniter of claim 1 , wherein the magnet is configured to undergo at least one of linear, rotary and vibratory motion responsive to the acceleration of the munition.
5. The igniter of claim 1 , comprising a spring affixed to the magnet and the igniter, wherein the spring is configured to undergo compression and release cycles based on the acceleration of the munition.
6. The igniter of claim 4 , wherein the spring comprises a plurality of helical strands configured to resist lateral displacement during the acceleration of the munition.
7. The igniter of claim 4 , comprising a latch configured to hold the magnet in a first position to precharge the spring prior to the acceleration of the munition and configured to release the magnet in response to acceleration of the munition at a beginning of the acceleration of the munition.
8. The igniter of claim 1 , comprising an initiator, the circuit being configured to activate the initiator by providing the predetermined accumulated voltage to the initiator when the all-fire condition is determined.
9. The igniter of claim 8 , wherein the initiator is a first one of a plurality of initiators, wherein the circuit is configured to activate each of the plurality of initiators.
10. The igniter of claim 8 , comprising a test lead coupled to the initiator and configured to be externally accessible after assembly of the igniter to determine an activation state of the initiator without disassembly of the igniter.