Inertially operated electrical initiation devices
An all-fire detection circuit for an electrically initiated inertial igniter munition. The all-fire detection circuitry including: an input configured for receiving an input voltage over a duration responsive to an acceleration of the munition; an electrical storage device configured to receive a portion of the input voltage over the duration and to thereby accumulate a charge, an output coupled to the electrical storage device to deliver an all-fire indication when at least a portion of the charge exceeds a first predetermined voltage; a first diode having a first anode coupled to the input, and a first cathode; a resistor coupled in series between the first cathode and the electrical storage device; a second diode having a second anode coupled to the electrical storage device, and a second cathode; and a third diode having a third anode coupled to the first cathode, and a third cathode coupled to the second cathode.
1. An all-fire detection circuit for an electrically initiated inertial igniter munition, the all-fire detection circuitry comprising:
an input configured for generating an input voltage over a duration responsive to an acceleration of the munition;
an electrical storage device configured to receive a portion of the input voltage over the duration and to thereby accumulate a charge,
an output coupled to the electrical storage device to deliver an all-fire indication when at least a portion of the charge exceeds a first predetermined voltage;
a first diode having
a first anode coupled to the input, and
a first cathode;
a resistor coupled in series between the first cathode and the electrical storage device;
a second diode having
a second anode coupled to the electrical storage device, and
a second cathode; and
a third diode having
a third anode coupled to the first cathode, and
a third cathode coupled to the second cathode.
2. The all-fire detection circuit of claim 1 , wherein the electrical storage device comprises a capacitor, a resistance of the resistor and a capacitance of the capacitor selected to provide a charging time constant that is longer than one second.
3. The all-fire detection circuit of claim 1 , comprising
a fourth diode with a fourth anode coupled to the resistor and a fourth cathode coupled to the first cathode.
4. The all-fire detection circuit of claim 1 , wherein the second diode comprises a back-biased voltage drop that reduces the portion of the input voltage over the duration provided to the electrical storage device.
5. The all-fire detection circuit of claim 4 , wherein the third diode is configured to discharge the charge when the input voltage drops below a second predetermined voltage.
6. The all-fire detection circuit of claim 1 , comprising a voltage divider circuit coupled between the electrical storage device and the output, the voltage divider providing a portion of the charge to the output.
7. The all-fire detection circuit of claim 6 , wherein the voltage divider circuit is coupled between the electrical storage device and a ground voltage thereby providing a discharging voltage path to the electrical storage device.
8. The all-fire detection circuit of claim 1 , wherein the third diode is a zener diode.
9. An all-fire detection circuit for an electrically initiated inertial igniter munition, the all-fire detection circuitry comprising:
an input configured for receiving an input voltage over a duration responsive to an acceleration of the munition;
an electrical storage device configured to receive a portion of the input voltage over the duration and to thereby accumulate a charge,
an output coupled to the electrical storage device to deliver an all-fire indication when at least a portion of the charge exceeds a first predetermined voltage;
a first diode having
a first anode coupled to the input, and
a first cathode;
a second diode having
a second anode, and
a second cathode coupled to the first cathode;
a resistor coupled in series between the second anode and the electrical storage device;
a third diode having
a third anode coupled to the electrical storage device, and
a third cathode; and
a fourth diode having
a fourth anode coupled to the first cathode, and
a fourth cathode coupled to the third cathode.