SoC Power Capability Detection Using PWM Load Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Multimedia streaming devices often malfunction due to insufficient input power from monitors with varying designs, leading to incorrect functioning.
Innovation Solution
A multimedia device with a power input interface, computing circuit, and load circuit that monitors operating voltage and adjusts pulse-width modulation (PWM) signal duty ratio to determine the upper bound of power consumption, ensuring optimal operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a multimedia device is designed to be driven by power provided by a monitor, then the device can operate with available power sources, but the device may not receive sufficient input power due to different monitor designs, causing incorrect functioning
Solution Approach 1:
The patent implements dynamic power consumption adjustment by modifying the operating frequency of the system-on-chip based on detected power source capabilities. The device transitions from static to dynamic operation, adapting its power consumption profile in real-time to match the available power supply, thereby ensuring reliable operation across different monitor designs.
Solution Approach 2:
The patent changes the operating parameters (frequency, voltage) of the multimedia device based on the detected power source characteristics. By adjusting these parameters dynamically, the device can operate correctly whether powered by a monitor with high output current capability or one with limited capability, resolving the contradiction between adaptability and reliability.
2Reliability
If the device operates at higher power consumption to ensure correct functioning, then the device can perform multimedia streaming reliably, but the device cannot be compatible with monitors that have limited output current capability
Solution Approach 1:
The system dynamically adjusts its power consumption by detecting the power source capability and modifying operating frequency accordingly. This dynamic adaptation allows the device to operate reliably at higher power when available, while automatically reducing power consumption when connected to monitors with limited output current capability.
Solution Approach 2:
The patent implements a feedback mechanism where the device detects the output current capability of the power source and uses this information to adjust its operating parameters. This closed-loop control ensures the device operates within the power delivery capabilities of any connected monitor, maintaining reliability across different power sources.
3Ease of manufacture
If the device uses a fixed power consumption design, then the device can be manufactured with simpler power management, but the device cannot adapt to monitors with varying output current capability
Solution Approach 1:
The patent transitions from a static power management design to a dynamic one, where the operating frequency and power consumption are adjusted based on detected power source capabilities. This dynamic approach maintains manufacturing simplicity while achieving adaptability across different monitor designs.
Solution Approach 2:
The device performs self-diagnosis of the power source capability and automatically adjusts its operating parameters without external intervention. This self-service mechanism maintains ease of manufacture while enabling adaptability to various monitor power outputs.
Data Source
AI summary
A multimedia device comprises a power input interface, a computing circuit and a load circuit. The power input interface is configured to receive an operating voltage. The computing circuit is configured to receive the operating voltage from the power input interface, and configured to output a pulse-width modulation (PWM) signal. The load circuit is configured to receive a test current from the power input interface, receive the PWM signal, and determine a magnitude of the test current according to a duty ratio of the PWM signal. The computing circuit is configured to monitor the variation of the operating voltage while adjusting the duty ratio of the PWM signal step by step. The computing circuit is configured to determine an upper bound of a power consumption of the computing circuit according to the relationship between the operating voltage and the duty ratio of the PWM signal.