Firing circuit for blasting caps专利检索-降压变压器变压器变压器和转换设备专利检索查询-专利查询网

Firing circuit for blasting caps

阅读：812发布：2022-01-10

专利汇可以提供Firing circuit for blasting caps专利检索，专利查询，专利分析的服务。并且The present system for selectively firing explosive charges utilizes as firing a signal an alternating current having a frequency of the order of 10 kHz and a voltage of at least 60 volts, which is transmitted by cable to the explosive site. A discriminating circuit adjacent each firing squib includes a step-down transformer with saturable core which effectively blocks spurious 60 cycle alternating current voltages. Series and shunt capacitances further insure against spurious signals and tune the circuit to enhance response to the firing signal. Convenient testing and monitoring circuits are described.，下面是Firing circuit for blasting caps专利的具体信息内容。

权利要求

2. A firing circuit according to claim 1, and wherein said primary and secondary transformer windings are electromagnetically coupled By ferromagnetic core means of such characteristics as to be fully saturated in response to application to the primary winding of a 60 Hz alternating voltage of the order of one volt.

3. A firing circuit according to claim 1, and including a resistive shunt connected across said conductive circuit means at the firing station, and means for locally grounding the midpoint of the resistive shunt.

4. A firing circuit according to claim 1, and including reactance means connected in series with said conductive circuit means adjacent the firing station for attenuating spurious radio frequency signals.

5. A firing circuit according to claim 1, and in which said signal generating circuit means have such characteristics that said firing signal has a voltage of approximately 130 volts and a frequency of approximately 8,500 Hz.

6. A firing circuit according to claim 1, and in which said secondary winding is directly connected to the igniter and forms a shunt circuit in parallel with the igniter having a resistance less than about one tenth the resistance of the igniter.

7. A firing circuit according to claim 2, and in which said secondary winding is directly connected to the igniter and forms a shunt circuit in parallel with the igniter, the shunt impedance to A.C. voltages that are of power frequency and that exceed about 1/10 volt being less than about one tenth the impedance of the igniter.

8. A firing circuit for igniting an explosive charge at a firing station, comprising circuit means at a control station remote from the firing station for selectively generating an alternating current firing signal having a signal voltage between about 60 and about 240 volts and a signal frequency of the order of 10 kHz, conductive circuit means for selectively transmitting the firing signal from the control station to the firing station, an electrical igniter at the firing station in firing relation to the explosive charge and responsive to a firing voltage of the order of 1/100 of said signal voltage, a step-down transformer adjacent the firing station having a primary winding coupled to said conductive circuit means and a secondary winding coupled to the igniter, and a capacitance conneced in shunt to the transformer primary winding and forming therewith a circuit resonant at said signal frequency.

9. A firing circuit according to claim 8, and including a second capacitance, said transformer primary winding being coupled to said conductive circuit means via a series connection of said second capacitance.

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Firing circuit for blasting caps

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