Multiplexed Power Supply Circuit for Standby Leakage Control
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Solution Overview
Problem
The complexity of power supply structures in electronic devices, such as communication devices, leads to reduced flexibility and increased power consumption, particularly in standby modes where electric leakage and bottom current issues arise.
Innovation Solution
A power supply circuit that includes a first and second voltage converter, a low dropout regulator, and a multiplexing module. The multiplexing module switches between the output ends of the first and second voltage converters based on their power-on or power-off states, ensuring that the first load is always powered and minimizing electric leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If more power supplies are combined to enhance chip functionality, then the power supply can support more complex chips with multiple power supply domains, but the flexibility of the power supply structure decreases
Solution Approach 1:
The first voltage converter is designed to perform multiple functions: it can supply power to the first load directly, and also supply power to the second voltage converter which then powers the second load. This multi-functional design allows a single voltage converter to serve multiple purposes, reducing the need for separate dedicated power supply paths and thereby maintaining flexibility while supporting complex power supply domains
2Use of energy by moving object
If the second voltage converter is powered off to reduce power consumption, then electric leakage and bottom current are reduced, but the first load cannot be powered continuously
Solution Approach 1:
The first voltage converter is configured to preliminarily supply power to the first load and also to pre-power the second voltage converter. This preliminary action ensures that when the second voltage converter is powered off to save energy, the first load continues to receive power from the first voltage converter, maintaining power supply continuity and reliability while enabling energy savings
3Adaptability or versatility
If multiple voltage converters are used to power different loads, then each load can have dedicated power supply, but electric leakage occurs when voltage converters are powered off
Solution Approach 1:
The patent extracts the harmful effect of electric leakage by disconnecting the power supply path to the second voltage converter when it is not needed. The first voltage converter is configured to supply power to the first load independently, and only powers the second voltage converter when the second load requires power. This extraction of the unnecessary power path eliminates electric leakage while maintaining the ability to configure power supply flexibly
Data Source
AI summary
Disclosed embodiments provide a power supply circuit, a control method therefor and an electronic device to improve flexibility and application scenarios of a power supply. The power supply circuit includes a first voltage converter, a second voltage converter and a first low dropout regulator, where an output end of the first low dropout regulator is electrically connected to a first load end. A multiplexing module is configured to connect, based on a power-on state and a power-off state of the second voltage converter, one of an output end of the first voltage converter and an output end of the second voltage converter to the first load end through the first low dropout regulator.