Saturable Inductor Pulse Source for Linear Load Current Rise
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Solution Overview
Problem
Conventional high-inertia current sources fail to provide reliable and precise current pulses to current-dependent loads like bridge wire detonators due to slowdown and reversal of current rise, which can affect the timing certainty in applications requiring nanosecond-scale precision.
Innovation Solution
A high-inertia current source comprising a power source, a discharge capacitor, and a saturable inductor, where the capacitor is charged and then discharged through the inductor, allowing for an exponential and subsequent linear increase in load current, with the inductor saturating to maintain a linear current rise despite impedance changes in the load.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a conventional high-inertia current source is used to provide current to a current-dependent load, then a large amount of current can be delivered in a short period of time, but the rate of rise of the current slows and reverses within nanoseconds, reducing timing precision
Solution Approach 1:
The patent changes the operating parameters of the inductive element by driving it into magnetic saturation. When the inductor saturates, its inductance value drops dramatically, causing the current rise rate to increase rather than slow down. This parameter change (inductance reduction through saturation) directly addresses the timing precision problem while maintaining high current delivery capability
Solution Approach 2:
The patent employs a dynamic operating mode where the inductive element transitions from a linear region to a saturated region during the current pulse. This dynamic behavior allows the system to adapt its characteristics in real-time: initially providing high inductance for controlled current rise, then transitioning to low inductance for sustained high-rate current delivery, thereby resolving the contradiction between power delivery and timing precision
2Duration of action of moving object
If the discharge capacitor is connected directly to the load without an inductive element, then the current pulse can be very brief, but the rate of rise of current slows and reverses, affecting reliability
Solution Approach 1:
The inductive element serves as an intermediary component between the discharge capacitor and the load. It mediates the current transfer by initially limiting the rate of rise through its inductance, then during saturation, it facilitates sustained high-rate current delivery. This intermediary role prevents the direct connection problems while maintaining brief pulse duration and improving reliability
Solution Approach 2:
The inductive element's inductance parameter dynamically changes from a higher value (unsaturated) to a lower value (saturated) during the pulse duration. This parameter change enables the system to maintain reliability by preventing current slowdown and reversal, while still achieving brief pulse durations through controlled saturation and subsequent current decay
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution ensures a reliable and precise linear increase in load current, maintaining high reliability and precision in current-dependent applications by preventing slowdowns and reversals, thus meeting the timing requirements of nanosecond-scale operations.
Implementation Method 1
the magnetic field established by the inductive element collapses, inductance of the inductive element falls, and current through the inductor rises
Implementation Method 2
The inductive element is configured to saturate during the linear operational period
Implementation Method 3
the discharge capacitor is charged by the power source... the discharge capacitor discharges current through the inductive element and the load
Data Source
AI summary
A pulsed current source comprises a power source, a discharge capacitor, and an inductive element. The discharge capacitor is selectively coupled to either of the power source or the inductive element. When coupled to the power source, the discharge capacitor is charged. The inductive element can be connected to a load. The load can have a current-dependent impedance. When the discharge capacitor is coupled to the inductive element, the discharge capacitor discharges through the inductive element and the load. The discharge capacitor and the inductive element are configured so that the current through the load exhibits a substantially linear rise in a linear operational region. The inductive element is configured to saturate during discharge of the capacitor through the load, so that the saturation of the inductive element causes the current through the load to continue to rise in a substantially linear fashion.