Power Supply Control Apparatus Reducing Circuit Area
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Solution Overview
Problem
Conventional switching power supply control apparatuses face challenges in miniaturization due to large circuit areas, primarily because they require numerous accumulators for configuration, which hinders performance improvement and noise reduction in digital control systems.
Innovation Solution
The proposed power supply control apparatus employs a configuration with a compensator, control target, and disturbance canceller, utilizing transfer functions to reduce the number of accumulators needed, allowing for proportional and integration compensation, as well as feedback gain for noise cancellation, thereby miniaturizing the circuit while maintaining robustness against noise and load fluctuations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional digital control configuration with multiple feedback elements and accumulators is used, then robust power supply control with wide load fluctuation capability is achieved, but the circuit area becomes large
Solution Approach 1:
The patent combines multiple feedback elements and accumulators into a unified controller structure that uses a single accumulator to store the control amount y. The feedback elements are integrated through a unified transfer function Wcp(z) that processes all feedback signals simultaneously, reducing the total component count while maintaining the same control functionality and robustness.
Solution Approach 2:
The unified transfer function Wcp(z) serves multiple functions simultaneously: it processes feedback from multiple sources, performs proportional and integration compensation, and generates the control signal. This multi-functional approach eliminates the need for separate dedicated circuits for each control function, significantly reducing circuit area.
2Measurement precision
If numerous accumulators are used for feedback elements in digital control, then control precision and noise rejection are improved, but device complexity increases
Solution Approach 1:
Multiple accumulators are merged into a single accumulator that stores the control amount y. The unified transfer function Wcp(z) processes all feedback signals through a single computational path, reducing device complexity while maintaining control precision through the mathematical properties of the unified transfer function.
3Adaptability or versatility
If multiple feedback elements with different parameters are implemented, then adaptability to different operating conditions is improved, but the number of components increases
Solution Approach 1:
The unified transfer function Wcp(z) is designed to handle multiple operating conditions and feedback types through a single multi-functional structure. It processes proportional feedback, integration feedback, and disturbance rejection signals simultaneously, providing adaptability to various load fluctuations without requiring separate dedicated components for each function.
Data Source
AI summary
A power supply control apparatus includes a first adder configured to generate a difference signal based on a target value and a feedback signal; a compensator having a first transfer function Wc(z) and configured to generate a control signal based on the difference signal; a control target having a second transfer function Wp(z) and configured to output an output signal generated in response to the control signal; a disturbance canceller having a third transfer function {l+Wc(z)·Wp(z)}/{Wc(z)·Wp(z)} and configured to generate a disturbance cancelling signal based on the output signal corresponding to a control amount y; a second adder configured to generate a differential disturbance signal based on an output of the first adder and the disturbance cancelling signal; and a filter circuit which generates the feedback signal based on the differential disturbance signal.