Electric Fence Capacitor Discharge Control
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Solution Overview
Problem
Existing electric fence energizers fail to effectively reconcile guard security, personal safety, and cost control, particularly in scenarios where the equivalent resistance at the terminals is low, leading to potential fatal accidents and inefficiencies in energy delivery.
Innovation Solution
A method for controlling a periodic pulse electric fence energizer with a first capacitor and at least one additional capacitor, where the discharge is controlled based on estimated equivalent resistance, with a time delay initiated when resistance falls below a threshold, preventing discharge during this period to manage energy delivery and reduce accident risk.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the charge level of capacitors is controlled to increase personal safety when resistance is low, then the risk of fatal accidents is reduced, but the electronics required to manage charge level and monitor resistance become expensive
Solution Approach 1:
The patent replaces expensive, complex electronic control systems with a simple, low-cost timer-based control mechanism. The timer is a basic electronic component that is inexpensive and reliable, eliminating the need for complex charge level management electronics and resistance monitoring circuits while still achieving the safety objective through temporal separation of capacitor discharges.
Solution Approach 2:
The patent changes the control parameter from continuous electronic monitoring of charge levels and resistance values to a fixed time-based parameter. By using a timer to control the sequence of capacitor discharges, the system achieves safety control through a simple temporal parameter rather than complex real-time electronic parameter adjustment.
2Object-affected harmful factors
If the charge level is modified to free an entangled animal, then personal security is improved, but the modification cannot be applied instantaneously and only affects following cycles
Solution Approach 1:
The patent uses a timer to pre-coordinate the discharge of multiple capacitors in a specific sequence. The timer ensures that capacitors are discharged in advance in a controlled manner, creating a progressive energy delivery pattern that can immediately respond to entangled animals by delivering increasing energy levels across successive pulses without waiting for electronic processing or charge level adjustments.
3Reliability
If powerful impulses are delivered to ensure guard safety in low impedance zones, then custody security is improved, but the risk of fatal accidents increases when impedance is very low
Solution Approach 1:
The patent divides the energy delivery into multiple segments by using separate capacitors that discharge in sequence rather than all at once. The first capacitor delivers an initial impulse, and subsequent capacitors deliver additional energy in controlled increments. This segmentation allows the system to provide sufficient total energy for guard safety while controlling the peak power and impulse characteristics to reduce lethal risk in low impedance scenarios.
Solution Approach 2:
The patent employs periodic discharge action through a timer-controlled sequence where capacitors are discharged in repeated cycles. This periodic action delivers energy in multiple pulses rather than a single continuous impulse, allowing the system to maintain cumulative energy delivery for effective guarding while limiting the instantaneous power to safer levels that reduce fatal accident risk.
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
This approach ensures maximum guard safety while minimizing the risk of fatal accidents and reducing costs by systematically using all capacitors, adjusting the time delay and threshold settings for optimal performance across varying impedance zones.
Implementation Method 1
a first capacitor and at least one other capacitor connected in parallel between the same terminals of the primary
Implementation Method 2
transformer whose primary is capable of being discharged almost simultaneously with the first capacitor so as to form a macro-pulse
Implementation Method 3
determining, from the discharge of said first capacitor, an estimate of the equivalent resistance at the terminals of the secondary
Data Source
Figure 1~2
Figure 3~4a
Figure 4b
AI summary
The invention relates to a method for controlling an electric fence (1) including a first capacitor (C1) and at least another capacitor(C2 to Cn), that comprises the following steps: discharging said first capacitor (C1) and determining the resistance equivalent to the transformer terminals; depending on the comparison of the equivalent resistance with a predetermined threshold, controlling or preventing the discharge of the other capacitor (C2 to Cn) and initiating a time-out and, during the time-out, preventing the discharge of the other capacitor, and when the time-out has elapsed, controlling the discharge of the other capacitor (C2 to Cn).