Power Control Circuit Safe-Start for Low-Current USB Charging
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Solution Overview
Problem
Existing mobile devices and electronic systems face instability and crashes when using low-current chargers, particularly USB chargers, due to insufficient power supply, leading to repeated system crashes and inability to charge batteries effectively, especially with non-standard or marginal charger adapters.
Innovation Solution
An electronic power control circuit with an anti-crash loop mechanism that monitors voltage levels and current thresholds to prevent system crashes by selectively activating or deactivating power supply, ensuring safe startup and stable operation even with low-current chargers, using a power conditioner circuit with a charging input, battery-related line, and power voltage output line, and a safe-start mechanism to manage power distribution and battery charging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If USB charging is used with low-current chargers, then user convenience and economy are improved, but system stability and reliability deteriorate due to insufficient power supply causing crashes
Solution Approach 1:
The patent implements a safe-start mechanism that performs preliminary power-up sequencing before full system operation. The power control circuit gradually activates subsystems in a predetermined sequence, monitoring voltage and current levels at each stage to ensure adequate power availability before proceeding to the next activation step, thereby preventing crashes from premature high-power demands
Solution Approach 2:
The patent employs continuous feedback monitoring of power supply conditions through voltage and current sensors that feed real-time data to the power control circuit. This feedback enables dynamic adjustment of power consumption levels and activation sequences based on actual charger capability, maintaining system stability while maximizing utilization of available low-current power sources
2Productivity
If power-up is attempted with insufficient charger current, then device functionality is improved, but system crashes occur due to power deficiency
Solution Approach 1:
The patent implements dynamic power management that continuously adapts system operation to available power levels. The power control circuit adjusts clock frequencies, voltage levels, and subsystem activation states in real-time based on monitored power availability, enabling the device to function productively within the constraints of low-current chargers while preventing crash conditions through continuous dynamic adaptation
3Adaptability or versatility
If standard USB power delivery is used, then compatibility with various chargers is improved, but power sufficiency deteriorates for high-consumption devices
Solution Approach 1:
The patent implements a universal power management system that can operate with multiple charger types and power levels. The power control circuit recognizes different charger capabilities and automatically configures the system to function optimally with each, enabling compatibility with low-current USB chargers while maintaining adequate performance for high-consumption operations through intelligent power allocation and sequencing across different operational modes
Data Source
AI summary
An electronic power control circuit includes a power conditioner circuit (120, 130) having a charging input line (116), a battery-related line (133) of the power conditioner circuit (120, 130), and a power voltage output line (137); and an anti-crash loop mechanism (170) coupled to the battery-related line (133) and to the power voltage output line (137) of the power conditioner circuit (120, 130), the anti-crash loop mechanism (170) having a control output line (172, PWGOOD) to be selectively active and inactive in response to voltage levels over time on the battery-related line (133) and on the power voltage output line (137) of the power conditioner circuit (120, 130).