Dynamic Filter Bandwidth Control for Adaptive Voltage Positioning
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Solution Overview
Problem
Conventional power converters face challenges in efficiently regulating output voltage across varying load conditions, leading to degraded DC load regulation and increased costs due to the need for additional capacitors to manage different load frequencies and duty cycles, which complicates the implementation of Active Voltage Positioning (AVP) and increases the size and cost of the power supply.
Innovation Solution
The implementation of a filter control system with a controllable filter, reference voltage generator, and filter controller that dynamically adjusts operational settings based on output voltage and VID values, allowing for adaptive voltage positioning by modifying the filtering bandwidth and time constant, thereby improving power conversion efficiency and reducing the need for additional capacitors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a low AVP bandwidth is used to achieve fast Vmode load transient, then load transient response is improved, but regular load transient performance deteriorates and more output capacitors are required
Solution Approach 1:
The patent implements dynamic filter bandwidth adjustment where the filter bandwidth is automatically modified based on operating conditions. During Vmode load transients, the bandwidth is reduced to achieve fast response, while during regular load transients, the bandwidth is increased to maintain performance without requiring additional capacitors. This dynamic adaptation resolves the contradiction by making the filter characteristics variable rather than fixed.
Solution Approach 2:
The patent changes the filter bandwidth parameter dynamically based on load conditions and AVP activation state. By adjusting this critical parameter, the system achieves fast Vmode load transient when needed while maintaining regular load transient performance, eliminating the need to increase capacitor quantity to satisfy both conditions simultaneously.
2Reliability
If more output capacitors are added to meet both fast Vmode load transient and regular load transient specifications, then transient performance is improved, but power supply size and manufacturing cost increase
Solution Approach 1:
The patent uses dynamic filter bandwidth adjustment to achieve reliable transient performance across different load conditions without increasing capacitor quantity. The filter adapts its bandwidth based on whether Vmode or regular load transient is occurring, maintaining high reliability for both cases while avoiding the cost increase associated with adding more capacitors.
Solution Approach 2:
By dynamically changing the filter bandwidth parameter, the system achieves the required transient performance specifications for both Vmode and regular load conditions using the same capacitor set. This parameter adjustment approach eliminates the need to increase component quantity, thereby reducing manufacturing cost while maintaining reliability.
3Ease of operation
If a fixed filter bandwidth is used, then implementation is simple, but performance degrades under varying load conditions and duty cycles
Solution Approach 1:
The patent transitions from a fixed filter bandwidth to a dynamic bandwidth that automatically adjusts based on load conditions and duty cycle. The filter remains simple to implement but gains adaptability by modifying its bandwidth characteristic in response to changing operating conditions, resolving the contradiction between simplicity and versatility.
Solution Approach 2:
The patent implements feedback mechanisms that monitor load conditions and duty cycle, then use this information to dynamically adjust the filter bandwidth. This feedback-driven adaptation maintains implementation simplicity while significantly improving load condition adaptability, as the system automatically responds to changing conditions without complex manual configuration.
Data Source
AI summary
An apparatus includes a filter to receive a signal indicating a magnitude of current supplied by an output voltage to power a dynamic load. The filter produces a filtered signal from the received signal. A reference voltage generator generates a target setpoint voltage based on the filtered signal. The target setpoint voltage is used to control (such as regulate) a magnitude of the output voltage. The apparatus further includes a filter controller to dynamically change operational settings of the filter. For example, the filter controller reduces the bandwidth of filtering the signal in response to detecting that: i) the magnitude of the output voltage falls below an output voltage threshold value, and ii) the magnitude of a received VID value is greater than a VID threshold value.