Implantable Medical Device Supply Circuit Battery Droop
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Solution Overview
Problem
Implantable medical devices (IMDs) experience excessive battery droop during high current events, which can disrupt the operation of low current circuits and increase complexity and cost due to the need for multiple capacitors in cardiac-related IMDs.
Innovation Solution
A supply circuit design that includes a battery, a current-modifying component, high current circuit, low current circuit, and a capacitor, where the current-modifying component prevents significant voltage changes in the battery during high current events, allowing the capacitor to be charged quickly and reducing the need for multiple capacitors, thereby minimizing battery droop and maintaining stable voltage for low current circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a battery is used to power high current circuits in an IMD, then the battery can provide the necessary current, but excessive battery droop occurs that disrupts low current circuits
Solution Approach 1:
The patent divides the power delivery function into two separate circuits: a high current circuit for delivering high current pulses and a low current circuit for stable low current operation. This segmentation allows each circuit to be optimized independently, with the high current circuit handling peak demands without causing voltage droop that would affect the low current circuit's stability.
Solution Approach 2:
The patent introduces a current-modifying component as an intermediary between the battery and the high current circuit. This component limits the maximum current that can be drawn from the battery, preventing excessive current draw that causes voltage droop, while still allowing sufficient current to reach the high current circuit when needed.
2Stability of the object's composition
If multiple capacitors are added to prevent battery droop, then voltage stability improves, but device complexity and cost increase
Solution Approach 1:
The patent extracts the voltage stabilization function from the power delivery system by using the current-modifying component to actively prevent voltage droop at its source. Instead of adding multiple capacitors to compensate for droop, the solution removes the root cause by limiting current draw, thereby eliminating the need for complex capacitor networks.
Solution Approach 2:
The patent replaces expensive and complex multiple-capacitor solutions with a simpler, more cost-effective current-modifying component. This component provides the necessary voltage stability protection without the complexity and cost of multiple high-voltage capacitors, offering a more economical solution that maintains reliability.
3Stability of the object's composition
If current is limited to prevent battery droop, then voltage stability improves, but the ability to deliver high current when needed is reduced
Solution Approach 1:
The current-modifying component is designed with dynamic characteristics that allow it to adapt to different operating conditions. It provides strong current limiting to prevent voltage droop during normal operation, but can quickly respond to and allow high current pulses when demanded by the high current circuit, thus maintaining both stability and peak power capability.
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 effectively prevents excessive battery droop, reduces the complexity and cost of IMDs by eliminating the need for multiple capacitors, and ensures stable operation of low current circuits during high current events, while allowing for efficient charging and discharging of capacitors.
Implementation Method 1
a capacitor. A terminal (e.g. positive (+) terminal) of a battery is connected to the low current circuit, a current-modifying component, a high current circuit, and the capacitor
Data Source
AI summary
A supply circuit for an implantable medical device (IMD) is presented. The supply circuit includes a battery, a high current circuit, a current-modifying component, a low current circuit, and a capacitor. The low current circuit is connected to a first terminal of the battery. A current-modifying component is connected to the battery, a capacitor, and to a high current circuit.