Power Converter Switch Control via Potential Comparison
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Solution Overview
Problem
The introduction of recovery times in power converters can lead to modifications in current setpoints, resulting in cumulative errors and degraded system performance, particularly due to the risk of 'active' recovery times causing incorrect current paths.
Innovation Solution
A method for controlling power converters that involves comparing electrical potentials at connection points before transitions and adjusting the closure times of switches to maximize 'inactive' recovery times and minimize 'active' recovery times, ensuring continuous current flow without errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If recovery times are introduced between switching sequences to ensure current continuity, then current flow continuity is improved, but current setpoint accuracy deteriorates due to cumulative errors from active recovery times
Solution Approach 1:
The invention changes the timing parameter of switch closures by introducing an additional delay around the transition. This delay is calculated based on the difference between the actual transition time and the ideal transition time, thereby adjusting the closure timing to minimize active recovery times and reduce cumulative errors in current setpoints.
Solution Approach 2:
The invention implements a feedback mechanism where the control system monitors the actual transition times and adjusts the additional delay for subsequent closures. By comparing the actual transition time with the ideal transition time and adjusting the delay accordingly, the system minimizes active recovery times and maintains accurate current setpoints.
2Reliability
If switch closure times are extended to ensure current continuity, then current flow reliability is improved, but system performance deteriorates due to increased active recovery times
Solution Approach 1:
The invention makes the switch closure timing dynamic by adjusting the additional delay based on the actual transition time. Rather than using a fixed delay, the system dynamically calculates the required delay to minimize active recovery times while ensuring current continuity, thereby optimizing both reliability and performance.
Solution Approach 2:
The invention optimizes the closure time parameter by introducing a variable additional delay that compensates for transition timing variations. This dynamic parameter adjustment ensures current continuity while minimizing the duration of active recovery times, thus maintaining high system performance.
3Measurement precision
If additional delay is introduced around transition to minimize active recovery times, then current setpoint accuracy is improved, but switching frequency is reduced
Solution Approach 1:
The invention applies a partial delay strategy where an additional delay is introduced only around the transition period when needed to minimize active recovery times. This partial action approach maintains current setpoint accuracy without excessively reducing the overall switching frequency, as the delay is localized to specific critical transitions rather than applied uniformly to all switching operations.
Data Source
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AI summary
The invention relates to a system (2) for controlling a power converter (1), the system (2) being capable of controlling at least two consecutive instances of the closure of pairs of controlled switches made up of a bottom switch and a top switch. Measurement means (3) capable of measuring, prior to a transition between the closing of one pair of controlled switches and the closing of another pair of controlled switches, the electric potential at the connection point for at least the two arms in which the controlled switches are affected by said transition; means (4) for comparing the measured potentials; and selection means (5) capable of selecting the top switch of the arm with the lowest measured electric potential and the bottom switch of the arm with the highest measured electric potential, and control means (6) capable of controlling the closing of the controlled switches selected during at least one additional time period around the transition.