Bluetooth Wake-Up Isolation Circuit for Low-Standby Power Control
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Solution Overview
Problem
Existing Bluetooth wake-up functions in communication technologies result in high power consumption and increased costs due to the need for a single-chip microcomputer to maintain the main control chip in a standby mode, failing to meet certification requirements for low standby power consumption.
Innovation Solution
A control system that includes a main control chip, a Bluetooth device, a controller, and an isolation circuit between the Bluetooth device and the main control chip, allowing the Bluetooth device to remain enabled and wake up the main control chip upon receiving an external signal, thereby reducing power consumption and eliminating the need for additional circuitry costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the main control chip enters standby mode to enable Bluetooth wake-up function, then the Bluetooth wake-up capability is achieved, but the overall power consumption increases to about 0.6 W which exceeds the 0.5 W certification requirement
Solution Approach 1:
The patent extracts the wake-up control function from the main control chip and implements it independently through a dedicated wake-up circuit. This circuit includes a wake-up comparator that detects external signals and triggers the main control chip to wake up only when needed, rather than keeping the main chip in continuous standby mode. This extraction allows the main control chip to be completely powered off during shutdown, reducing power consumption to below 0.5 W while maintaining Bluetooth wake-up capability.
2Use of energy by moving object
If a single-chip microcomputer is added to control the shutdown process, then the standby power consumption is reduced to 0.4 W meeting certification requirements, but the circuit costs increase due to additional components
Solution Approach 1:
The patent replaces the expensive single-chip microcomputer with a simple, low-cost wake-up circuit consisting of basic electronic components such as comparators, resistors, and capacitors. This wake-up circuit performs the essential function of detecting external signals and triggering chip wake-up without requiring a full microcomputer. The solution achieves the same power consumption reduction (below 0.5 W) at a fraction of the cost and with significantly reduced circuit complexity.
3Reliability
If the main control chip is kept in standby mode with WIFI_PWREN and BT_EN ports enabled, then the Bluetooth wake-up function operates correctly, but the power consumption of the main control chip alone becomes 0.2 W which contributes to exceeding the overall power limit
Solution Approach 1:
The patent implements preliminary action by preparing a dedicated wake-up circuit that remains active and monitors for external signals while the main control chip is completely powered off. The wake-up circuit includes a comparator that is pre-configured to detect wake-up signals on specific pins. When a wake-up signal is detected, the circuit immediately triggers the main control chip to power on, eliminating the need to keep the main chip in standby mode. This preliminary preparation of the wake-up mechanism allows the main chip to be fully powered down, reducing its power consumption from 0.2 W in standby to near-zero when off.
Data Source
AI summary
The invention provides a control system for controlling an intelligent system to reduce the power consumption based on a Bluetooth device, comprising: a main control chip; the Bluetooth device connected with the main control chip; a controller connected with the Bluetooth device and the main control chip, respectively, wherein the controller is connected with a power supply and is used for controlling the on and off of the power supply circuit of the control chip; and an isolation circuit connected among the Bluetooth device, main control chip and the controller, when the controller controls the power supply circuit to be switched off, the isolation circuit enables the Bluetooth device at an enabled state. The issues, that the cost is increased due to the fact that the single-chip microcomputer is additionally arranged to realize Bluetooth wake-up and the overall power consumption of the intelligent system is high, are overcome.