Switching Arm Dead-Time Control Using Switch Voltage Feedback
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Solution Overview
Problem
Existing switching systems with dead time in DC/DC converters and inverters/rectifiers often use fixed or predetermined dead times, which can be excessively lengthy or require costly sensors and memory for adaptive control, leading to inefficiencies and increased costs.
Innovation Solution
A control system that monitors switch voltage to dynamically determine dead time for each switching operation, allowing for adaptive adjustment based on the switch voltage, eliminating the need for additional hardware and reducing complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixed dead time is used to ensure soft switching conditions, then switching reliability is improved, but switching efficiency deteriorates due to excessively lengthy dead time in many cases
Solution Approach 1:
The patent applies dynamics by transitioning from a fixed dead time to a dynamically adjustable dead time. The control system monitors switch voltage in real-time and adjusts the dead time duration based on actual switching conditions, allowing the system to optimize between reliability and efficiency for each switching event rather than using a conservative fixed value throughout.
Solution Approach 2:
The patent implements feedback by continuously monitoring the switch voltage during the dead time period. The control system uses this voltage information to determine when the switching operation is complete and to adjust subsequent dead time durations, creating a closed-loop system that adapts to actual conditions rather than relying on predetermined fixed values.
2Productivity
If predetermined dead time values from a table are used to optimize switching, then switching performance is improved, but device complexity increases due to additional sensors, memory, and processing requirements
Solution Approach 1:
The patent applies self-service by enabling the control system to determine dead time autonomously based on real-time switch voltage monitoring. Rather than requiring external sensors, lookup tables, and complex processing to retrieve predetermined values, the system uses its existing voltage measurement capabilities to self-determine the appropriate dead time duration for each switching event.
Solution Approach 2:
The patent demonstrates multi-functionality by using the existing switch voltage measurement infrastructure for a dual purpose: both for detecting switch desaturation states and for determining dead time duration. This eliminates the need for separate sensors and processing paths that would be required by table-based approaches, reducing overall system complexity while maintaining adaptive performance.
Data Source
AI summary
A switching system is disclosed having a switching arm with a high-side switch and a low-side switch. A control system switches the switching arm alternately between a first configuration, in which the high-side switch is open and the low-side switch is closed, and a second configuration, in which the high-side switch is closed and the low-side switch is open. The control system commands, for each switching operation, the opening of the switch that is initially closed, and then, at the end of a dead time, commands the closure of the switch that is initially open. The system has device for measuring a switch voltage present between the terminals of one of the switches. For each switching operation, the control system, following the command to open the switch initially closed, monitors the measured switch voltage, and determine the dead time for the switching operation based on the monitored switch voltage.