| 摘要 |
<p>An electronic safe/arm device is powered internally by a low-voltage, periodic power source (12) that has insufficient voltage by itself to fire the detonator (18). The circuit therefore includes a step-up transformer (14) from which sufficient voltage to fire the detonator (18) is obtained. The step-up transformer (14) charges an arming circuit (16) which stores high-voltage power to fire the detonator (18) and also powers the firing circuit (20) which discharges the stored high-voltage energy through the detonator (18) at the appropriate time, to fire the device. The low-voltage, periodic power source (12) may include a low-voltage battery (120) and a dynamic switch (126) for providing periodic pulses of low-voltage energy to the primary winding (140) of the transformer (14), and the dynamic switch (126) may be powered from the output of the transformer (14), so that the low-voltage battery (120) has insufficient voltage to power the dynamic switch (126). Accordingly, high-voltage energy derived from the output of the transformer (14) is required to operate the circuit, providing assurance that the device will not fire if the circuit is damaged.</p> |
