Voltage Regulator Control Circuit for USB OTG Power Optimization
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Solution Overview
Problem
Conventional voltage regulators in USB OTG systems consume unnecessary power by maintaining a constant output voltage, even when a lower voltage can suffice to supply the required current, leading to increased power consumption.
Innovation Solution
A voltage regulator with a control circuit that adjusts the output voltage based on the load's current requirements, using a comparing circuit, operation signal generation circuit, and reference voltage adjusting circuit to optimize the output voltage and reduce power consumption, employing adjustable reference voltages and variable charge pumps with adjustable output-to-input voltage ratios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the voltage regulator maintains a constant high output voltage (5V) to ensure stable current supply, then the load receives sufficient current, but unnecessary power consumption increases
Solution Approach 1:
The patent applies dynamics by making the reference voltage adjustable rather than fixed. The control circuit dynamically adjusts the reference voltage based on feedback from the output current, allowing the output voltage to adapt to different load conditions. This resolves the contradiction by enabling the system to maintain reliable current supply when needed while reducing power consumption when lower voltage suffices.
Solution Approach 2:
The patent changes the parameter of reference voltage from a fixed value to an adjustable value that can vary based on load requirements. By modifying this key parameter, the system can optimize the balance between providing stable current and minimizing power consumption, directly addressing the technical contradiction.
2Device complexity
If the voltage regulator uses a fixed reference voltage to simplify the control circuit, then the device complexity is reduced, but the adaptability to different load conditions deteriorates
Solution Approach 1:
The patent implements feedback by using the output current signal to adjust the reference voltage. The control circuit continuously monitors the output current and modifies the reference voltage accordingly, creating a closed-loop system. This feedback mechanism provides adaptability to different load conditions while keeping the control circuit relatively simple, resolving the contradiction between complexity and versatility.
Solution Approach 2:
The patent makes the control circuit multi-functional by enabling it to both regulate voltage and adapt to different load conditions through a single integrated system. The adjustable reference voltage mechanism allows the same circuit to serve multiple purposes: maintaining stable output and optimizing power consumption across various operating conditions.
Data Source
AI summary
The present invention discloses a method for controlling a voltage regulator, including steps of: converting an input voltage to an output voltage and providing an output current; sensing the output current; reducing the output voltage; and when the reduction of the output voltage causes the output current to change, setting the output voltage back to a value which does not change the output current.