Power Converter Control Apparatus Reducing Waveform Distortion
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Solution Overview
Problem
Existing power converter control apparatuses face high processing loads due to complex calculations required to reduce distortion in alternating current waveforms, which can lead to inefficiencies in inductor current control.
Innovation Solution
A control apparatus that delays the off-switching timing of the drive switch based on alternating-current voltage, using a sinusoidal command to adjust the inductor current and reduce distortion, thereby lowering processing loads by eliminating the need for deviation range parameter calculations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If complex calculations are performed to reduce distortion in alternating current waveforms, then waveform quality is improved, but processing load increases
Solution Approach 1:
The patent extracts and eliminates the complex deviation range parameter calculations from the control system. Instead of performing full distortion calculations, the invention uses a simplified approach that only requires basic timing delays and voltage detection, removing the computationally intensive elements while maintaining waveform quality through alternative means (timing-based control).
Solution Approach 2:
The invention changes the control parameter from complex deviation range calculations to simple timing delay parameters. By controlling the off-switching timing of the drive switch based on alternating-current voltage phases and fixed delay periods, the system achieves waveform distortion reduction without requiring heavy computational resources for parameter calculation.
2Manufacturing precision
If complex calculations are performed to reduce distortion in alternating current waveforms, then waveform quality is improved, but device complexity increases
Solution Approach 1:
The patent removes the complex calculation modules and deviation range parameter computation units from the control system architecture. The simplified design eliminates unnecessary computational components while retaining the essential timing control and voltage detection functions, thereby reducing device complexity.
Solution Approach 2:
The control system uses the inherent characteristics of the alternating-current voltage waveform itself to determine timing delays, rather than requiring external complex calculation inputs. The system serves itself by using the voltage phase information directly to control switch timing, eliminating the need for additional complex processing circuits.
Data Source
AI summary
In a control apparatus for a power converter, a current obtainer obtains a current flowing through an inductor as an inductor current, and an alternating-current voltage obtainer obtains an alternating-current voltage. A drive signal outputting unit generates, based on the alternating-current voltage obtained by the voltage obtainer, a sinusoidal command. The drive signal outputting unit performs peak-current mode control to output a drive signal that controls switching of the drive switch to thereby cause the inductor current to follow the sinusoidal command. A delay unit delays, for one switching cycle of the drive switch, an off-switching timing of the drive switch in accordance with the alternating-current voltage. The drive signal defines the off-switching timing of the switch.