Digital Power Supply Control With Load Impedance Estimation
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Solution Overview
Problem
Conventional power supply apparatuses are unable to provide optimal control operation due to fixed performance determined by analog circuit elements, leading to degraded circuit properties when the control target or parasitic parameters differ from design assumptions, and require narrow feedback bandwidth for stabilization, which degrades circuit properties.
Innovation Solution
A power supply apparatus with a first A/D converter, digital signal processing circuit, D/A converter, and load estimating unit that measures parasitic impedance using test signals, allowing for digital control adjustments to match reference values and optimize control operations based on measured impedance characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an analog controller is used with fixed performance determined by analog elements, then the circuit operation is stable under design assumptions, but the control performance degrades when the control target or parasitic impedance differs from design assumptions
Solution Approach 1:
The patent replaces the analog controller with a digital signal processing circuit that performs digital calculation processing to generate control values. This substitution allows the control parameters to be dynamically adjusted based on measured parasitic impedance and load conditions, resolving the contradiction between stable control performance and adaptability to changing conditions.
Solution Approach 2:
The patent introduces a load estimating unit that dynamically measures parasitic impedance and determines optimal control parameters in real-time. This dynamic adaptation allows the controller to maintain optimal performance under varying load conditions and different parasitic impedance characteristics, rather than being fixed to design assumptions.
2Stability of the object's composition
If the feedback bandwidth is narrowed to provide stabilized circuit operation, then the circuit operation becomes stable, but the circuit properties are degraded
Solution Approach 1:
The patent changes the control parameters dynamically based on the measured parasitic impedance and load conditions. By adjusting the feedback bandwidth and other control parameters in real-time rather than using fixed narrow bandwidth, the system maintains circuit operation stability while preserving or enhancing circuit response capability to sudden load changes.
3Adaptability or versatility
If digital signal processing is used to dynamically adjust control parameters, then the adaptability to load changes and parasitic impedance is improved, but the device complexity increases
Solution Approach 1:
The patent implements a universal digital signal processing controller that can handle various load conditions and parasitic impedance characteristics through software-based parameter adjustment. This multi-functional approach consolidates multiple control strategies into a single adaptable system, managing the complexity through integration rather than multiplication of separate control circuits.
Data Source
AI summary
A first A/D converter converts an analog observed value, which corresponds to a power supply signal supplied to a power supply terminal of a DUT, into a digital observed value. By means of digital calculation processing, a digital signal processing circuit generates a control value that is adjusted such that the digital observed value matches a predetermined reference value. A first D/A converter supplies, via a power supply line to the power supply terminal of the DUT, an analog power supply signal obtained by performing digital/analog conversion of the control value. A load estimating unit applies a test signal containing a predetermined frequency component via the power supply line to a node via which the power supply terminal is to be connected, and generates a control parameter for the digital signal processing circuit according to the test signal and the observed signal.