Power Converter Dynamic Bandwidth Control for Transient Response
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Solution Overview
Problem
Power converters face a trade-off between providing rapid transient response and limiting input current modulation, often requiring a compromise that can lead to increased component count and costs due to the need for high bandwidth during transient events and low bandwidth for input current modulation.
Innovation Solution
The dynamic adjustment of power converter bandwidth by introducing a functional block that increases the error value fed to multipliers by a factor f(x), allowing for a smooth transition between high and low bandwidths during transient and dynamic response periods, respectively, thereby optimizing the control loop for both requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If high bandwidth is used during transient events, then rapid transient response is improved, but input current modulation increases
Solution Approach 1:
The patent implements dynamic bandwidth adjustment by modifying the error signal processing in the control loop. A functional block dynamically scales the error signal based on operating conditions, allowing the effective bandwidth to vary between high (during transients) and low (during steady state). This resolves the contradiction by making the bandwidth adaptive rather than fixed, enabling rapid response when needed while limiting current modulation during normal operation.
2Speed
If fixed high bandwidth is used, then rapid transient response is improved, but component count increases due to need for large energy storage capacitance
Solution Approach 1:
The patent uses dynamic error signal scaling to achieve variable effective bandwidth without requiring physically variable components. The control algorithm adapts the error magnitude fed to the PI controller, creating a dynamic response characteristic that eliminates the need for large energy storage capacitors while maintaining fast transient response capability.
Solution Approach 2:
The patent changes the parameter being controlled from fixed physical components to a software-based error signal scaling factor. By modifying the gain applied to the error signal dynamically, the system achieves variable bandwidth behavior without changing physical component values, thereby reducing component count and complexity.
3Object-generated harmful factors
If fixed low bandwidth is used, then input current modulation is limited, but transient response becomes slow
Solution Approach 1:
The patent implements a dynamic control strategy where the error signal is scaled by a factor that depends on system state. During transient conditions, the scaling factor increases effective bandwidth for fast response; during steady state, the scaling factor reduces effective bandwidth to limit current modulation. This dynamic adaptation resolves the contradiction between response speed and current modulation limits.
Data Source
AI summary
A power converter is configured to increase bandwidth in response to a magnitude of the difference between the target output voltage and the actual output voltage. The converter includes a subtractor to receive a reference voltage and a scaled output as inputs, configured to produce an error as output, a functional block configured to receive the error as input and to produce a functional block output, a first multiplier configured to receive the functional block output and scale the functional block output by a first loop constant, and a second multiplier configured to receive the functional block output and scale the functional block output by a second loop constant. The functional block is configured to increase the error value fed to the first multiplier and the second multiplier by a factor f(x).