초록 ▼

Each of first and second switches, preferably ganged, have first and second operative relationships. In the first operative relationship, the first switch is connected across a firing device to prevent the firing device from being energized. In the first operative relationship, the second switch is

Each of first and second switches, preferably ganged, have first and second operative relationships. In the first operative relationship, the first switch is connected across a firing device to prevent the firing device from being energized. In the first operative relationship, the second switch is connected across an energy storage device (e.g. capacitor) to prevent the capacitor from being charged. In the second operative relationship of the second switch, the capacitor is charged by an energy supply device (e.g. battery). In the second operative relationship of the first and second switches, the capacitor is connected in a circuit with the first device and a third switch (e.g. transistor). The transistor is normally nonconductive to prevent the capacitor from discharging through the firing device with the first and second switches in the second operative relationships. When the transistor becomes conductive with the first and second switches in the second operative relationship, the capacitor discharges and fires the firing device. The transistor becomes conductive when a triggering signal is introduced to a pair of terminals. The triggering signal may be filtered by a low pass filter (e.g. inductance and capacitance) to prevent noise from passing. A device (e.g. zener diode) limits the triggering signal amplitude. The filtered triggering signal charges the capacitance in the low pass filter. The capacitor charge causes a second transistor to become conductive, thereby producing a voltage across an impedance. This voltage triggers the first transistor to the conductive state to provide for the firing of the firing device.

대표청구항 ▼

In combination, firing means having properties of being fired upon the receipt of electrical energy, first switching means having first and second operative relationships and operative in the first relationship for short circuiting the firing means, energy supply means, energy storage means, second

In combination, firing means having properties of being fired upon the receipt of electrical energy, first switching means having first and second operative relationships and operative in the first relationship for short circuiting the firing means, energy supply means, energy storage means, second switching means having first and second operative relationships and operative in the first relationship for short circuiting the energy storage means and operative in the second relationship to provide for the passage of energy from the energy supply means to the energy storage means for the storage of such energy in the energy storage means, third switching means having first and second operative relationship and normally operative in the first relationship to provide a high impedance to the firing means and the energy storage means to prevent the energy storage means from discharging through the firing means and operative in the second relationship to provide a low impedance path for the discharge of the energy in the energy storage means through the firing means, first means for initially providing for a change in the first and second switching means from the first operative relationships to the second operative relationships, and second means for subsequently introducing a triggering pulse to the third switching means to provide for a change in the third switching means from the first operative relationship to the second operative relationship.