Switchable Current Paths for Inrush-Limited Energy Storage Control
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Solution Overview
Problem
Existing electronic circuits face challenges in efficiently managing inrush current during power-up and isolating energy storage components in low power modes to prevent damage and energy loss, particularly due to the need for effective routing and shielding of large capacitors or inductors in integrated circuits.
Innovation Solution
An integrated circuit (IC) with control circuitry that manages external and internal switches to control current paths for energy storage components, using a secondary current path with higher on-resistance for initial power-up to limit inrush current and a primary current path for steady-state operation to divert high currents, along with fault detection mechanisms to monitor voltage thresholds and charging profiles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If discrete energy storage components are used externally to the IC, then energy storage capacity is improved, but routing and shielding challenges increase
Solution Approach 1:
The patent divides the current path into multiple segments: an internal secondary current path within the IC and an external primary current path for discrete components. This segmentation allows the IC to manage large energy storage components externally while maintaining controlled current flow through internal routing, reducing the complexity of external routing and shielding requirements.
2Quantity of substance
If large capacitors are used for energy storage, then energy storage capacity is improved, but inrush current spikes increase
Solution Approach 1:
The patent implements preliminary action by enabling the internal secondary current path before activating the external primary current path. The control circuitry detects when the energy storage component voltage reaches a threshold level and only then enables the external switch, preventing inrush current spikes from occurring in the first place rather than merely mitigating them.
Solution Approach 2:
The internal secondary current path acts as an intermediary between the power source and the external primary current path. It provides a controlled, higher resistance path that limits inrush current while still allowing the large external capacitor to charge, thereby protecting the IC from harmful current spikes.
3Adaptability or versatility
If discrete energy storage components are located away from the IC, then integration flexibility is improved, but current routing efficiency deteriorates
Solution Approach 1:
The patent extracts the high-current handling function from the IC to external discrete components, allowing the IC to focus on control functions. The external energy storage components are placed away from the IC for integration flexibility, while the internal secondary current path extracts and manages the current flow efficiently, compensating for the physical separation.
4Loss of energy
If energy storage components are isolated in low power mode, then energy loss prevention is improved, but system complexity increases
Solution Approach 1:
The control circuitry provides self-service by automatically monitoring the voltage across the energy storage component and autonomously switching between operational modes. When the voltage reaches a threshold, the control circuitry automatically disables the external switch and activates the internal secondary path, eliminating the need for external control logic and reducing overall system complexity.
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 IC effectively controls inrush current and prevents damage by using a current-limited secondary path during power-up and diverts high currents away from the IC during steady-state operation, while fault detection ensures reliable operation and energy retention by identifying and addressing potential faults in the system.
Implementation Method 1
The first internal switch may be configured to have a higher on-resistance than the external switch
Implementation Method 2
a second mode in which the external switch of the primary current path is actuated to enable the primary current path
Data Source
AI summary
An integrated circuit (IC) comprising: control circuitry operable to control: an external switch of a primary current path for an energy storage component of a circuit, wherein the external switch of the primary current path is external to the IC; a first internal switch of a secondary current path for the energy storage element, wherein the first internal switch is internal to the IC, wherein the IC is operable in: a first mode in which the first internal switch of the secondary current path is actuated to enable the secondary current path; and a second mode in which the external switch of the primary current path is actuated to enable the primary current path.