Interleaved Chopper Frequency Control for Phase Current Drift
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Solution Overview
Problem
The magnetic coupling interleave type chopper circuit in power conversion devices experiences phase current drift when the travel motor load current ripple frequency synchronizes with the gate pulse repetition frequency, leading to deteriorated controllability and potential abnormal heat generation.
Innovation Solution
A transformation control device that dynamically changes the switching frequency of the magnetic coupling interleave type chopper circuit using a time-series approach, incorporating random frequency adjustments based on reactor current measurements to synchronize phase currents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the gate pulse repetition frequency is synchronized with the travel motor load current ripple frequency, then the power conversion efficiency is improved, but phase current drift occurs and controllability deteriorates
Solution Approach 1:
The patent applies dynamics by making the switching frequency adjustable rather than fixed. The control device dynamically changes the switching frequency of the magnetic coupling interleave type chopper circuit to avoid synchronization with the travel motor load current ripple frequency, thereby preventing phase current drift while maintaining efficient power conversion.
Solution Approach 2:
The patent changes the parameter of switching frequency to resolve the contradiction. By varying the switching frequency away from the ripple frequency, the system avoids the harmful synchronization effect that causes phase current drift, while still operating at high efficiency points.
2Productivity
If the switching frequency is increased to improve power conversion speed, then the power conversion efficiency is improved, but phase current drift and abnormal heat generation occur
Solution Approach 1:
The system uses dynamic frequency adjustment to achieve high power conversion speed without the harmful effects. The switching frequency is changed in real-time to avoid synchronization with load current ripple, enabling fast conversion while preventing phase current drift and abnormal heat generation.
Solution Approach 2:
The patent converts the potential harm of high-frequency switching (which could cause synchronization and phase current drift) into a benefit by deliberately varying the frequency. This frequency variation prevents the harmful synchronization effect while maintaining the advantages of high-speed power conversion.
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
This solution effectively suppresses phase current drift, enhancing controllability and preventing abnormal heat generation in the chopper circuit by desynchronizing the load current ripple frequency with the gate pulse repetition frequency.
Implementation Method 1
a magnetic coupling interleave type chopper circuit, the transformation control device generates a transformation gate signal having a switching frequency
Implementation Method 2
The transformation control device may acquire a reactor current of each phase by using a single current sensor and set the switching frequency based on the reactor current
Data Source
AI summary
Provide a transformation control device and a power conversion device capable of suppressing drift of a phase current in a magnetic coupling interleave type chopper circuit. The transformation control device controls the magnetic coupling interleave type chopper circuit and includes a switching frequency setting unit that changes and sets a switching frequency of the magnetic coupling interleave type chopper circuit in a time series manner within a predetermined frequency range, in which the transformation control device generates a transformation gate signal having the switching frequency and outputs the transformation gate signal to the magnetic coupling interleave type chopper circuit.