Power Supply Wake-Up Circuit for Ultra-Low Standby Current
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Solution Overview
Problem
Current power supply technologies face challenges in reducing standby current to below 1 microampere and effectively waking up power supply products from low power consumption states, which is crucial for safe and efficient transportation and usage.
Innovation Solution
A power supply apparatus wake-up circuit is introduced, comprising a power consumption control circuit with a voltage regulation module and a protection circuit, along with a wake-up circuit that includes a first switching device. The voltage regulation module adjusts voltage output based on a sleep control signal, and the wake-up circuit outputs a wake-up control signal to stop over-discharge protection, reducing standby current to less than 1 microampere and enabling user-controlled wake-up.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If voltage regulation module adjusts voltage output based on sleep control signal, then standby current is reduced to less than 1 microampere, but device complexity increases
Solution Approach 1:
The power consumption control circuit is divided into distinct functional modules: voltage regulation module, protection circuit, and wake-up circuit. Each module operates independently with specific functions, allowing the system to achieve ultra-low standby current by selectively controlling each segment while maintaining overall system functionality.
Solution Approach 2:
The voltage regulation module performs preliminary voltage adjustment before power is fully cut off to the protection circuit. By pre-regulating the voltage to a safe level based on the sleep control signal, the system ensures that when power is completely disconnected, the standby current drops below 1 microampere while avoiding damage from unregulated voltage spikes.
2Reliability
If over-discharge protection is triggered, then battery safety is improved, but power supply product cannot be used until recharged
Solution Approach 1:
The protection circuit continuously monitors battery voltage and provides feedback control. When over-discharge is detected, the circuit triggers protection and simultaneously activates the wake-up function through the first switching device, creating a feedback loop that allows the system to recover and become available again after protection is triggered, rather than remaining permanently disabled.
Solution Approach 2:
The wake-up circuit enables the power supply product to self-recover from the protected state. Through the first switching device and wake-up control signal, the system can automatically reset the protection circuit and restore normal operation without requiring external intervention or complete disassembly, allowing continued use after recharging.
3Use of energy by moving object
If voltage is completely cut off to reduce standby current, then energy consumption is reduced, but wake-up function becomes difficult to implement
Solution Approach 1:
The wake-up circuit maintains a minimal standby pathway through the first switching device even when the voltage regulation module cuts off power to the protection circuit. This preliminary preparation ensures that when a wake-up signal is needed, the circuit can quickly restore power without requiring complex reinitialization sequences, making the wake-up operation simple and reliable.
Solution Approach 2:
The first switching device acts as an intermediary between the completely powered-off protection circuit and the external wake-up trigger. It provides a controlled interface that allows external signals to penetrate through the power-off state and activate the protection circuit when needed, enabling easy wake-up operation while maintaining ultra-low standby current during normal sleep mode.
Data Source
AI summary
A power supply apparatus wake-up circuit is provided. The power supply apparatus wake-up circuit includes a power consumption control circuit and a wake-up circuit connected to the power consumption control circuit. The power consumption control circuit includes a voltage regulation module and a protection circuit connected to the voltage regulation module. The voltage regulation module adjusts a voltage output to the protection circuit according to a sleep control signal. The protection circuit determines whether to trigger over-discharge protection according to an input voltage. The wake-up circuit includes a first switching device, and the wake-up circuit outputs a wake-up control signal to the protection circuit based on an operation of the first switching device by a user such that the protection circuit stops triggering the over-discharge protection.