Soft-Switching Control Device With EEPROM Delay Correction
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Solution Overview
Problem
Soft-switching in power conversion circuits faces challenges in maintaining controllability due to variations in delay time between command and actual switching states, leading to increased switching losses and reduced efficiency.
Innovation Solution
A soft-switching control device that includes a storage means for correction information and a correcting means to adjust the timing of switching states based on this information, reducing errors in delay time and enhancing controllability by using correction data stored in a non-volatile memory.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If soft-switching is performed by controlling delay time, then switching losses are reduced, but controllability decreases due to variations in delay time between command and actual switching
Solution Approach 1:
The patent applies preliminary action by measuring and storing correction values for delay time variations before actual operation. The system pre-characterizes the relationship between command timing and actual switching timing, storing correction data in advance to compensate for variations during soft-switching operations, thereby maintaining both low switching losses and high controllability
Solution Approach 2:
The patent implements feedback by using measured actual switching timings to calculate and store correction values that are then applied to future delay time control. This closed-loop approach continuously improves the accuracy of delay time control, ensuring reliable soft-switching operation while minimizing switching losses
2Reliability
If a margin is set in delay time for hard-switching, then switching reliability is improved, but soft-switching effectiveness decreases
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the delay time parameter based on stored correction values. Instead of using a fixed margin-based delay time, the system modifies the delay time parameter to compensate for individual variations in switching characteristics, enabling precise soft-switching control while maintaining reliability
Solution Approach 2:
The patent applies local quality by tailoring the delay time control to the specific characteristics of each switching element. The correction values are stored and applied locally to compensate for individual differences in switching timing, allowing each switching element to operate optimally for soft-switching without requiring excessive margins
Data Source
AI summary
Soft-switching is performed to switch a switching state to an ON state by controlling a delay time of a timing at which a main switch switches to an ON state relative to a timing at which a sub-switch switches to an ON state. Controllability of soft-switching decreases as a result of variations in time difference of a command for switching the main switch to the ON state and the actual switching of the switching state. To set a delay time suitable for performing soft-switching based on the variations in time difference, an EEPROM is provided that stores therein correction data for the delay time. The delay time of the timing of the command for switching the main switch to the ON state relative to the timing of the command for switching the sub-switch to the ON state is set based on the correction data.