Multi-phase Converter Control Gain Adjustment
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Solution Overview
Problem
Multi-phase converter control devices with magnetically coupled reactors face decreased controllability due to mismatched step-up ratios, leading to hunting issues when using a single control device for feedback control.
Innovation Solution
A multi-phase converter control device that calculates and adjusts the control gain based on the step-up ratio, using a feedback control unit with a step-up ratio calculation unit, voltage control unit, and current control unit to generate PWM signals and drive the converter, thereby improving controllability by approximating different step-up ratios to a single model.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a control device is provided for each plant model with a different step-up ratio, then the controllability is improved, but the device size becomes large
Solution Approach 1:
The patent applies universality by designing a single control device that can handle multiple plant models with different step-up ratios. The control device calculates the actual step-up ratio and dynamically adjusts control parameters to accommodate various operating conditions, eliminating the need for multiple dedicated control devices while maintaining controllability across all scenarios.
Solution Approach 2:
The patent implements dynamics by making the control parameters adaptive rather than fixed. The control device dynamically calculates the step-up ratio based on actual operating conditions and adjusts control parameters in real-time, allowing a single static device to effectively handle multiple dynamic plant models with different step-up ratios.
2Device complexity
If feedback control is performed with one control device, then the device size is reduced, but the controllability decreases due to mismatched control gain
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting control parameters based on the calculated step-up ratio. The control device modifies gain parameters and other control settings according to the actual operating conditions, enabling a single control device to maintain optimal controllability across different step-up ratio scenarios that would otherwise require multiple fixed-parameter devices.
Solution Approach 2:
The patent implements feedback by continuously monitoring the step-up ratio and using this information to adjust control parameters. The control device calculates the actual step-up ratio from system measurements and feeds this information back to modify control gains, creating a closed-loop system that adapts to changing conditions and maintains controllability without requiring multiple dedicated control devices.
3Device complexity
If a single plant model is used for control, then the device complexity is reduced, but hunting occurs due to mismatched step-up ratio
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting control parameters based on the calculated step-up ratio. The control device modifies gain parameters and other control settings according to the actual operating conditions, enabling a single static device to maintain optimal controllability across different step-up ratio scenarios that would otherwise require multiple fixed-parameter devices.
Solution Approach 2:
The patent implements dynamics by making the control parameters adaptive rather than fixed. The control device dynamically calculates the step-up ratio based on actual operating conditions and adjusts control parameters in real-time, allowing a single static device to effectively handle multiple dynamic plant models with different step-up ratios.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution enhances the controllability of the multi-phase converter by preventing hunting and stabilizing the step-up voltage, allowing for efficient power conversion in applications like hybrid or electric vehicles.
Implementation Method 1
a feedback control unit configured to perform feedback control such that the step-up voltage is a target voltage
Implementation Method 2
a PWM control unit configured to generate a PWM signal on the basis of a voltage command value output from the feedback control unit
Implementation Method 3
a plurality of converters connected to each other in parallel have reactors, and the reactors are magnetically coupled with each other and step up an input voltage to generate a step-up voltage
Data Source
AI summary
This multi-phase converter control device performs PWM control on driving of a multi-phase converter. The multi-phase converter is configured such that a plurality of converters connected to each other in parallel have reactors, and the reactors are magnetically coupled with each other and step up an input voltage to generate a step-up voltage. This multi-phase converter control device includes a feedback control unit configured to perform feedback control such that the step-up voltage is a target voltage, a PWM control unit configured to generate a PWM signal on the basis of a voltage command value output from the feedback control unit, and a drive unit configured to drive the multi-phase converter on the basis of the PWM signal. The feedback control unit calculates a step-up ratio of the multi-phase converter and changes a control gain in the feedback control on the basis of the step-up ratio.