DC-DC Converter Voltage Regulation via Current Consumption
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Solution Overview
Problem
Conventional DC-DC converters have a slow response time to fluctuations in load conditions, leading to dips or spikes in output DC voltage, which can cause errors in low-voltage components due to their reliance on voltage feedback loops that are slower than current changes.
Innovation Solution
A voltage adjustment circuit that detects changes in electrical current consumption by the load and provides a control indication to the converter to adjust the output DC voltage more quickly, using a trim control logic, A/D, and D/A converters to regulate the output voltage based on current changes rather than voltage levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If voltage feedback loop is used to regulate output DC voltage, then voltage regulation is achieved, but response time is slow (2-3 microseconds)
Solution Approach 1:
The patent measures current consumption before it causes significant voltage drops or spikes. By detecting current changes early and adjusting the converter output proactively, the system prevents voltage excursions rather than reacting to them after they occur. This preliminary action enables faster response compared to waiting for voltage feedback.
Solution Approach 2:
The patent introduces current consumption measurement as an intermediary parameter between load changes and converter control. Instead of directly monitoring voltage (which reacts slowly), the system uses current measurement as an early indicator of load changes and employs this information to adjust the converter output, effectively mediating the control response.
2Reliability
If duty cycle is adjusted to compensate for output voltage variations, then output voltage can be increased or decreased, but the adjustment process is slow
Solution Approach 1:
The system adjusts the duty cycle proactively based on measured current consumption changes before they translate into significant voltage variations. By detecting current changes early and pre-adjusting the duty cycle, the system eliminates the delay associated with waiting for voltage feedback and subsequent correction.
Solution Approach 2:
The patent implements a current-based feedback mechanism that complements or replaces the traditional voltage feedback loop. By continuously measuring current consumption and using this information to adjust the duty cycle, the system achieves faster and more accurate control compared to relying solely on slow voltage feedback.
3Reliability
If conventional voltage feedback loop is used, then output voltage can be regulated, but voltage dips or spikes occur during load transitions
Solution Approach 1:
By measuring current consumption early in the load transition process, the system can adjust the converter output before voltage dips or spikes occur. This proactive adjustment maintains voltage stability during load changes, preventing the excursions that occur with conventional reactive voltage feedback.
Solution Approach 2:
The system applies counter-action in advance by adjusting the duty cycle in response to current changes before they cause voltage instability. This preliminary anti-action compensates for upcoming voltage drops or spikes, maintaining stable output voltage during load transitions.
Data Source
AI summary
A system includes a converter to convert an input voltage to an output voltage, where the converter has an adjustment input. The system further includes a voltage adjustment logic to receive an indication of an electrical current consumed by a load, with the voltage adjustment logic being responsive to the indication of the consumed electrical current to provide a control indication to the adjustment input of the converter to adjust the output voltage from the converter.