Bandgap Voltage Reference Power Management for Wearables

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Solution Overview

Problem

Existing bandgap voltage reference circuits in wearable electronic devices consume excessive power, limiting the development of these devices due to their high power consumption, especially the 1 uA-type bandgaps which are not scalable and inefficient.

Innovation Solution

A power supply circuit that includes a bandgap voltage reference, a real-time detection and control module, and an alternate voltage source module, where the detection and control module adjusts the output point voltage of the alternate voltage source to match the bandgap voltage, allowing the bandgap to be powered down and reducing overall power consumption.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Stability of the object's composition

If a bandgap voltage reference is used to provide stable voltage in wearable electronic devices, then voltage stability is improved, but power consumption increases excessively

Engineering Contradiction:

Improvevoltage stabilityVSAvoidpower consumption

Core Design Contradiction:

Stability of the object's compositionVSUse of energy by moving object

Solution Approach 1:

The patent implements dynamic switching between bandgap voltage reference and alternate voltage source based on real-time detection of voltage stability requirements and power consumption conditions. The system transitions from static bandgap-only operation to dynamic multi-source operation, activating the bandgap only when high precision is needed and using alternate sources otherwise.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent changes the operational parameters of the voltage reference system by introducing multiple voltage sources with different characteristics (bandgap for precision, alternate sources for efficiency) and dynamically adjusting which source is active based on detected conditions, thereby optimizing the balance between stability and power consumption.

Inventive Principle:

Principle #35Parameter changes

2Use of energy by moving object

If 1 uA-type bandgap is used to minimize current, then power consumption is reduced, but anti-noise performance deteriorates and the circuit becomes non-scalable

Engineering Contradiction:

Improvepower consumptionVSAvoidanti-noise performance

Core Design Contradiction:

Use of energy by moving objectVSReliability

Solution Approach 1:

The patent creates a universal voltage reference system that can serve multiple functions: high-precision voltage reference when bandgap is active, and efficient power supply when alternate sources are active. The system adapts its function based on real-time conditions, providing both precision and efficiency in different operational modes.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The patent introduces a detection and control module as an intermediary that monitors voltage stability and power consumption conditions, then intelligently switches between bandgap and alternate voltage sources. This intermediary manages the trade-off between noise performance and power consumption, allowing the system to achieve both goals under different conditions.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Stability of the object's composition

If bandgap voltage reference operates continuously to ensure stable voltage, then voltage stability is maintained, but power consumption increases and usage duration decreases

Engineering Contradiction:

Improvevoltage stabilityVSAvoidusage duration

Core Design Contradiction:

Stability of the object's compositionVSDuration of action of moving object

Solution Approach 1:

The patent implements periodic activation of the bandgap voltage reference based on detected voltage stability requirements and power consumption conditions. Instead of continuous operation, the bandgap is activated periodically when high precision is needed and deactivated when alternate sources suffice, thereby extending usage duration while maintaining necessary stability.

Inventive Principle:

Principle #19Periodic action

Solution Approach 2:

The patent uses preliminary detection of voltage stability conditions and power consumption levels to determine in advance whether the bandgap should be activated. The detection module assesses conditions before switching, ensuring the bandgap is activated only when truly necessary, thereby optimizing both stability and duration.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS10429873B2Power supply circuit, power supply circuit generation method, and power supply circuit control method

Publication Date: 2019.10.01 SEMICON MFG INT (SHANGHAI) CORP

AI summary

The present disclosure relates to the field of intelligent wearable technologies, and provides a power supply circuit, a power supply circuit generation method, and a power supply circuit control method. The present disclosure provides a power supply circuit, including: a bandgap voltage reference Bandgap, a real-time detection and control module, and an alternate voltage source module, where the real-time detection and control module adjusts an output point voltage of the alternate voltage source module according to an output voltage of the Bandgap; and when the output point voltage of the alternate voltage source module reaches a target voltage, the real-time detection and control module closes the Bandgap and supplies power by using the alternate voltage source module. In such a power supply circuit, after adjustment of an output point voltage of an alternate voltage source module is completed, a Bandgap does not need to keep a power-supply state, and therefore power consumed by the Bandgap is reduced based on stable voltage supply.