Dual Mode DC-DC Converter Regulation Loop
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Solution Overview
Problem
Conventional DC-DC converters for portable devices require multiple individual stages for different voltage and current requirements, leading to size, complexity, and power consumption issues, and switching between modes can cause unstable output signals due to strong loop responses.
Innovation Solution
A DC-DC converter with a power stage driven by a pulse width modulator, incorporating two error amplifiers and switching circuitry to support voltage and current regulation modes, along with a reference voltage controller to dynamically adjust the second reference voltage, minimizing transients during mode transitions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple individual DC-DC converter stages are used for different voltage and current requirements, then the converter can meet diverse application needs, but the size, complexity, and power consumption increase
Solution Approach 1:
The patent implements a single DC-DC converter stage that can operate in multiple regulation modes (voltage mode and current mode) by switching the feedback input to the pulse width modulator between different feedback voltage sources. This allows one converter to replace multiple dedicated converter stages, reducing overall system complexity while maintaining the ability to provide different voltage and current outputs for various device functions
2Adaptability or versatility
If switching circuitry is used to switch between different regulation modes, then the converter can support multiple applications, but strong loop responses occur causing unstable output signals
Solution Approach 1:
The patent introduces a reference voltage controller that dynamically adjusts the reference voltage of the second error amplifier before and during mode transitions. By preemptively modifying the reference voltage to track between modes, the system prepares the feedback loop in advance, minimizing abrupt changes and reducing transient oscillations when switching between voltage and current regulation modes
Solution Approach 2:
The patent employs dual feedback paths with two separate error amplifiers - one for voltage feedback and one for current feedback. The switching circuitry selectively connects the appropriate feedback path to the pulse width modulator based on the desired operation mode, allowing stable regulation in each mode while maintaining the ability to switch between them
Data Source
AI summary
The invention relates to a DC-DC converter, which includes a power stage driven by a pulse width modulator, a first error amplifier with a first input coupled to a first reference voltage source and a second input coupled to a current sink through which a current is fed from an output of the power stage to receive a first feedback voltage (FB1), a second error amplifier with a first input coupled to a second reference voltage source and a second input coupled to the output of the power stage to receive a second reference voltage (FB2), and switching means (SW1) for connecting a control input of the pulse width modulator with the output of the first error amplifier in a current regulation mode and with the output of the second error amplifier in a voltage regulation control mode.