Buck Converter Current Regulation via Pulse Level Transformation
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Solution Overview
Problem
Prior art floating buck converter circuits face challenges in precisely regulating the average output current due to reliance on peak current sensing, leading to less precise average output current regulation.
Innovation Solution
The implementation of a Pulse Level Transformation method applied to the VSNS voltage signal in a floating buck converter circuit, which transforms the VSNS voltage signal into a periodic square waveform, allowing for precise regulation of the direct current (DC) output current by controlling the mid-level of the VSNS slope, independent of inductor value, current ripple, and input voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If peak current sensing is used to control the transistor current, then the control circuit can operate with simple implementation, but the average output current regulation precision deteriorates
Solution Approach 1:
The patent introduces an intermediary calculation process that computes the average value of peak currents over multiple switching cycles. This intermediary step transforms the simple peak current measurements into a precise average output current value, resolving the contradiction between simple implementation and high precision regulation.
Solution Approach 2:
The control circuit performs preliminary actions by accumulating and averaging peak current values over multiple switching cycles before generating the final control signal. This preliminary processing enables precise average current regulation while maintaining the simplicity of peak current sensing.
2Adaptability or versatility
If inductor value is changed to adjust output current, then the circuit design becomes flexible, but the regulation precision deteriorates due to current ripple variations
Solution Approach 1:
The patent implements a feedback mechanism that continuously monitors the actual average output current and adjusts the duty cycle accordingly. This feedback loop compensates for current ripple variations caused by different inductor values, maintaining high regulation precision while allowing design flexibility.
Solution Approach 2:
The control circuit dynamically adjusts the duty cycle based on real-time average current measurements rather than relying on fixed inductor value assumptions. This dynamic adaptation enables precise regulation regardless of the inductor value or resulting current ripple characteristics.
3Power
If PWM control is used to adjust duty cycle, then the output power can be controlled, but the average current regulation precision deteriorates due to switching transient effects
Solution Approach 1:
The patent ensures continuous useful action by accumulating peak current measurements over multiple switching cycles to compute the average value. This continuous accumulation process smooths out switching transient effects and provides precise average current regulation while maintaining effective output power control through duty cycle adjustment.
Data Source
AI summary
An apparatus in an electronic device such as a buck converter circuit receives as a first input a voltage signal VSNS from the electronic device that represents a current through the electronic device, and receives as a second input a direct current reference voltage signal from a reference voltage source VREF. The apparatus regulates a direct current output IOUT of the electronic device with respect to the reference voltage source VREF by applying a pulse level transformation to the voltage signal VSNS using an operational transconductance amplifier.