Voltage Converter Dynamic ON Time Correction
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Solution Overview
Problem
Existing voltage converters face challenges in maintaining a consistent voltage conversion ratio due to individual variations in circuit components, leading to inefficiencies and potential insufficient ON time, which affects the expected voltage-conversion ratio.
Innovation Solution
A voltage converter system that includes a reactor, a switching element, a diode, a current sensor, and a controller, where the controller detects current values multiple times during the switching period, calculates the estimated execution ON time, and corrects the command ON time to ensure it does not exceed a predetermined upper limit, thereby maintaining a consistent voltage conversion ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the command ON time is set based on the worst-case scenario (longest execution ON time) to ensure sufficient ON time, then the OFF time does not become zero and the current detecting circuit is protected, but the voltage conversion ratio varies individually and sufficient ON time cannot be obtained for units with shorter execution ON time
Solution Approach 1:
The patent applies dynamics by making the command ON time adjustable and adaptable to individual unit characteristics. Instead of using a fixed worst-case setting, the system dynamically determines the appropriate command ON time for each unit based on its actual execution ON time measurements, allowing optimal performance while maintaining reliability
Solution Approach 2:
The patent implements feedback by measuring the actual execution ON time of each unit and using this information to adjust the command ON time. The controller receives feedback about individual unit performance and modifies the control parameters accordingly, eliminating individual variations in voltage conversion ratio
2Productivity
If the command ON time is set to achieve high voltage conversion ratio, then the execution ON time may be insufficient for units with longer execution ON time due to component variation, but reducing the command ON time to accommodate worst-case scenarios reduces the voltage conversion ratio
Solution Approach 1:
The patent applies parameter changes by adjusting the command ON time parameter based on measured execution ON time characteristics of each unit. The system changes the control parameter (command ON time) to match the actual performance characteristics, achieving both high voltage conversion ratio and reliable operation
Solution Approach 2:
The patent implements preliminary action by measuring the execution ON time before finalizing the control parameters. The system performs preliminary characterization of each unit's timing characteristics and uses this information to set appropriate command ON time values before normal operation begins
Data Source
AI summary
To provide a voltage converter configured to suppress individual variation in voltage conversion ratio and configured to achieve a high voltage conversion ratio. A voltage converter comprising a reactor, a switching element, a diode, a current sensor, and a controller, wherein the controller detects a current value of the reactor several times in a switching period; wherein the controller calculates an estimated execution ON time length from a transition of a current value of the reactor detected in the switching period; wherein the controller calculates a difference between the estimated execution ON time length and a command ON time length instructed by the controller; and wherein, by using the difference, the controller corrects the command ON time length of the time when performing any of subsequent ON commands in a range not exceeding a predetermined command ON time upper limit value.