Dual Voltage Source Circuit for Sleep Mode Power Management
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Solution Overview
Problem
Linear voltage regulators face challenges in reducing current consumption during sleep modes while maintaining logical information retention and avoiding overvoltage in subcircuits, leading to shortened battery life and potential circuit damage.
Innovation Solution
A circuit with a regulated first voltage source and an adjustable second voltage source, where the second voltage source takes over during sleep mode, using a series regulator and an evaluation circuit with a memory to adjust output voltage and maintain logical information, reducing current consumption by setting the output voltage within a safe range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the first voltage source is deactivated in sleep mode to reduce current consumption, then battery life is extended, but the subcircuit may be damaged by overvoltage or lose logical information
Solution Approach 1:
The output voltage of the second voltage source is adjusted in advance during operating mode to match the supply voltage level. This preliminary adjustment ensures that when the first voltage source is deactivated, the subcircuit receives a compatible voltage level, preventing overvoltage damage and logical information loss while enabling low-power sleep mode operation
Solution Approach 2:
A second voltage source is introduced as an intermediary component between the battery and the subcircuit. This intermediate voltage source can be independently controlled to provide appropriate voltage levels during sleep mode, allowing the first voltage source to be deactivated for power savings while maintaining circuit safety through the mediating second voltage source
2Loss of information
If the output voltage of the second voltage source is adjusted to match the first voltage source output, then logical information is retained, but current consumption increases
Solution Approach 1:
The output voltage of the second voltage source is made dynamically adjustable based on the operational state. During operating mode, the output voltage is adjusted to match the first voltage source output to retain logical information. During sleep mode, the first voltage source is deactivated and the second voltage source provides a reduced voltage level, optimizing the balance between information retention and power consumption through dynamic voltage adjustment
Data Source
AI summary
In certain embodiments, a circuit comprises a first voltage source configured to provide a supply voltage at an output of the first voltage source for a subcircuit. The circuit further comprises at least one second voltage source configured to provide output voltage to supply the subcircuit when the first voltage source is deactivated. The circuit further comprises an evaluation circuit connectable to an output of the at least one second voltage source, to a control input of the at least one second voltage source, and to the output of the first voltage source. The evaluation circuit is configured to adjust, based on the supply voltage at the output of the first voltage source, an output voltage of the at least one second voltage source.