Power Supply Circuit for Wearables Using Substitute Voltage Source
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Solution Overview
Problem
Conventional Bandgap circuits face a trade-off between low power consumption and noise tolerance, limiting their application in wearable devices, where achieving low power consumption results in insufficient noise tolerance for high-speed devices and vice versa.
Innovation Solution
A power supply circuit comprising a Bandgap voltage reference, a real-time detection and control circuit, and a substitute voltage source, where the real-time detection and control circuit adjusts the output voltage of the substitute voltage source to match the Bandgap voltage reference, allowing the substitute voltage source to replace the Bandgap voltage reference when equal, thereby reducing power consumption while maintaining stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the power consumption of Bandgap voltage reference is reduced to achieve low power consumption suitable for wearable devices, then the noise tolerance capability deteriorates, making it unsuitable for high-speed devices
Solution Approach 1:
The system is divided into two functional modules: a Bandgap voltage reference module that generates a stable reference voltage, and a substitute voltage source module that provides the actual power supply. The real-time detection and control circuit acts as a bridge between them, detecting the Bandgap output and controlling the substitute voltage source accordingly. This segmentation allows the Bandgap module to operate at ultra-low power (1uA) while the substitute module handles the power delivery, resolving the contradiction between low power consumption and adequate noise tolerance.
Solution Approach 2:
The real-time detection and control circuit serves as an intermediary between the Bandgap voltage reference and the substitute voltage source. It continuously monitors the Bandgap output voltage and uses this information to regulate the substitute voltage source, ensuring that the final power supply maintains stability and noise tolerance characteristics without requiring the Bandgap circuit to operate at high current levels.
2Use of energy by moving object
If conventional Bandgap circuits operate at 1uA to meet wearable device power requirements, then the noise tolerance becomes insufficient for high-speed devices, but operating at higher currents (5uA or 10uA) increases power consumption beyond wearable device limits
Solution Approach 1:
The substitute voltage source creates a copy or replica of the stable voltage characteristics provided by the Bandgap reference, but delivers it through a different pathway that doesn't require the Bandgap circuit itself to consume high power. The control circuit replicates the voltage regulation function, allowing the system to achieve the adaptability of higher-current Bandgap circuits while maintaining the low power consumption of 1uA operation.
Data Source
AI summary
A power supply circuit, its generating and control methods are presented, relating to smart wearable devices. The power supply circuit comprises a Bandgap voltage reference, a real-time detection and control circuit, and a substitute voltage source. The real-time detection and control circuit is connected to the Bandgap voltage reference and the substitute voltage source, and adjusts an output voltage of the substitute voltage source to match an output voltage of the Bandgap voltage reference. After these output voltages are equal, the output voltage of the power supply circuit is provided by the substitute voltage source, and the Bandgap voltage reference can be disconnected from the circuit. This circuit can lower the power consumption of the Bandgap voltage reference without affecting the stability of the voltage output.