Detonation control
Detonation control modules and detonation control circuits are provided herein. A trigger input signal can cause a detonation control module to trigger a detonator. A detonation control module can include a timing circuit, a light-producing diode such as a laser diode, an optically triggered diode, and a high-voltage capacitor. The trigger input signal can activate the timing circuit. The timing circuit can control activation of the light-producing diode. Activation of the light-producing diode illuminates and activates the optically triggered diode. The optically triggered diode can be coupled between the high-voltage capacitor and the detonator. Activation of the optically triggered diode causes a power pulse to be released from the high-voltage capacitor that triggers the detonator.
1. A detonation control module, comprising:
a high-voltage capacitor;
an optically triggered diode coupled between the high-voltage capacitor and a detonator;
a light-producing diode positioned to activate the optically triggered diode;
a timing circuit comprising a delay element that controls timing of an activation of the light-producing diode; and
a transistor coupled to a trigger input signal, the transistor preventing activation of the detonator by stray signals;
wherein activation of the light-producing diode illuminates the optically triggered diode and causes a power pulse to be released from the high-voltage capacitor to the detonator.
2. The detonation control module of claim 1 , wherein the optically triggered diode is reverse biased, and wherein avalanche breakdown of the optically triggered diode causes the power pulse to be released from the high-voltage capacitor.
3. The detonation control module of claim 1 , wherein the transistor is a field effect transistor (FET), and wherein activation of the detonator by stray signals is prevented by a parasitic capacitance of the FET and a gate voltage level required to activate the FET.
4. The detonation control module of claim 1 , wherein the light-producing diode is a laser diode.
5. The detonation control module of claim 1 , wherein the high-voltage capacitor is at between 1000 volts and 3500 volts when fully charged.
6. The detonation control module of claim 1 , further comprising a bleed resistor and a passive diode connected to the high-voltage capacitor such that if a high-voltage supply is disconnected from the high-voltage capacitor, the high-voltage capacitor discharges through the bleed resistor and the passive diode.
7. The detonation control module of claim 1 , wherein the timing circuit comprises:
at least one integrated circuit (IC);
for the at least one IC, a diode forward biased between a supply voltage and a power input pin of the IC and a plurality of capacitors in parallel connected between the power input pin of the IC and ground, wherein the diode and the plurality of capacitors act as a temporary power supply to the IC when the supply voltage is disconnected or shorted.
8. A detonation control method, comprising:
activating a laser diode using at least one timing circuit comprising a delay element to control a timing of activating the laser diode;
illuminating an optically triggered diode with a beam produced by the activated laser diode; and
providing a power pulse from a high-voltage capacitor to a detonator, the optically triggered diode coupled between the high-voltage capacitor and the detonator.
9. The detonation control method of claim 8 , wherein the timing circuit is triggered by an input trigger signal pulse.
10. The detonation control module of claim 1 , wherein the timing circuit provides a signal at a controlled time to activate the light-producing diode.