Sequential Pulse Activation for Electrosurgical Power Supply Noise Reduction
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Solution Overview
Problem
In electrosurgical systems, multiple isolated power supplies sharing a common low voltage power source experience peak current draw issues when activated simultaneously, leading to output noise in analog circuits due to increased impedance and resistance, especially when the circuits lack adequate power supply rejection bandwidth at the switching frequency.
Innovation Solution
A method and system that utilize a master device to generate pulse signals to sequentially activate floating power supplies connected to loads, minimizing peak current draw by creating a sequenced electrical connection between loads and the power source, thereby reducing noise in the power supply.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple isolated power supplies are activated simultaneously to power analog circuits, then all circuits can operate at the same time, but the peak current draw on the shared power source increases causing output noise
Solution Approach 1:
The patent implements periodic sequential activation of multiple isolated power supplies using pulse signals. The master device generates pulse signals that trigger slave devices to activate power supplies in sequence rather than simultaneously. This periodic action spreads out the current draw over time, reducing peak current demand on the shared power source while maintaining operational availability of all circuits.
Solution Approach 2:
The master device generates pulse signals in advance to control the sequential activation timing of slave devices. By pre-calculating and distributing timing signals, the system ensures that power supplies are activated in a coordinated sequence that minimizes peak current draw while maintaining all circuits operational.
2Power
If multiple power supplies draw power simultaneously from a shared source, then maximum power delivery capacity is utilized, but the output impedance and internal resistance cause noise in analog circuits
Solution Approach 1:
The sequential pulse-based activation creates periodic power delivery patterns rather than simultaneous maximum draw. This distributes the power demand over time, reducing the instantaneous current draw that would otherwise cause noise through output impedance and internal resistance while maintaining the ability to deliver full power when needed.
Solution Approach 2:
The master device pre-coordinates power supply activation timing to prevent simultaneous maximum draw. By distributing the power delivery timeline across multiple sequential pulses, the system maintains power delivery capacity while avoiding the noise-generating peak currents that would result from simultaneous activation.
3Device complexity
If analog circuits lack adequate power supply rejection bandwidth, then circuit design is simplified, but noise from power supply switching is not filtered out
Solution Approach 1:
By implementing sequential periodic activation of power supplies, the system reduces the frequency and amplitude of noise signals presented to analog circuits. This allows circuits with limited power supply rejection bandwidth to operate without excessive noise, as the noise is distributed over time rather than occurring as simultaneous high-frequency transients.
Data Source
AI summary
An electrosurgical system includes an electrosurgical generator, a power source configured to deliver power to at least one load connected to the generator, a master configured to generate an initial pulse, and a plurality of slaves connected in series to the master. The initial pulse cooperates with a first floating power supply configured to create an electrical connection between at least one first load and the power source. A first slave is configured to generate a subsequent pulse based on the initial pulse. The subsequent pulse cooperates with a second floating power supply configured to create an electrical connection between at least one second load and the power source. The subsequent pulse is configured to cause an ensuing slave to generate an additional pulse. The additional pulse cooperates with a corresponding floating power supply configured to create an electrical connection between at least one additional load and the power source.