Load Switch Slew-Rate Control for Compact Power Sequencing
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Solution Overview
Problem
Conventional electronic power switches are inefficient and costly due to their complexity and requirement for numerous power management ICs, leading to increased size and cost, especially in high-end devices where precise power switching and sequencing are necessary.
Innovation Solution
A power control device that generates primary and secondary power control signals, allowing for controlled operation of load switches with adjustable slew rates and sequencing, along with monitoring circuitry for voltage regulation and synchronization, reducing the need for external microcontrollers and minimizing component count.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional power management systems use multiple disparate power ICs and external microcontrollers for precise power switching and sequencing, then power control precision and reliability are improved, but device complexity and footprint size increase significantly
Solution Approach 1:
The patent combines multiple power management functions (power switching, sequencing, monitoring, and control) into a single integrated power management IC. This consolidation eliminates the need for multiple disparate power ICs and external microcontrollers, thereby maintaining power control precision while significantly reducing system complexity and footprint size.
Solution Approach 2:
The integrated power management IC performs multiple functions including generating primary and secondary power control signals, controlling load switch slew rates, sequencing power-on/power-off operations, and monitoring voltage levels. This multi-functional approach replaces several specialized components with one universal device, reducing overall system complexity while maintaining operational precision.
2Manufacturing precision
If conventional systems use numerous power management ICs and external microcontrollers, then precise power switching control is achieved, but manufacturing cost and component count increase
Solution Approach 1:
By integrating power switching control, sequencing logic, and monitoring functions into a single IC, the patent reduces the total component count and assembly complexity. This consolidation maintains precise power switching control while lowering manufacturing costs through reduced component procurement, inventory management, and assembly operations.
Solution Approach 2:
The integrated power management IC includes built-in monitoring circuitry that automatically detects voltage levels and controls sequencing without requiring external microcontrollers. This self-service capability eliminates the need for additional control components, simplifying manufacturing and reducing costs while maintaining precise switching control.
3Adaptability or versatility
If conventional power architectures use multiple disparate power ICs, then specific power switching requirements are met, but device footprint size increases
Solution Approach 1:
The patent consolidates multiple power management functions into a single integrated IC that can be mounted on the PCB in one location. This integration maintains the adaptability to meet specific power switching requirements through internal programmable logic and multiple control outputs, while dramatically reducing the PCB footprint by eliminating the need for multiple discrete ICs and associated external control components.
Solution Approach 2:
The integrated power management IC provides universal power control capabilities that can handle various power switching requirements through programmable sequencing logic and multiple output channels. This single multi-functional device replaces several specialized ICs, reducing PCB footprint while maintaining the versatility needed for different power management scenarios.
4Adaptability or versatility
If conventional systems use external microcontrollers and GPIO pins for power control, then flexible power management is achieved, but device complexity and space requirements increase
Solution Approach 1:
The integrated power management IC incorporates built-in monitoring circuitry and control logic that automatically manages power sequencing and switching without requiring external microcontrollers. The device monitors voltage levels, generates appropriate control signals, and executes sequencing operations autonomously, thereby maintaining power management flexibility while significantly simplifying system operation and reducing the number of external components needed.
Solution Approach 2:
The power management IC includes monitoring circuitry that provides feedback on voltage levels to the internal control logic, enabling automatic adjustment of power switching and sequencing operations. This feedback mechanism maintains operational flexibility by allowing the system to respond to actual power conditions while eliminating the need for external microcontrollers to perform monitoring and control functions.
Data Source
AI summary
A power control device can generate control signals to control operation of power sources. Additional control signals control operation of load switches that can be connected to the power sources to provide secondary sources of power. The load switches can be turned in a gradual manner at rates that depend on the power sources to which they are connected. The outputs of the load switches can be monitored for overvoltage and undervoltage conditions relative to the power sources to which they are connected.