Parallel Power Switching Circuit With Staggered Gate Timing
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Solution Overview
Problem
Conventional power switching circuits face issues with inconsistent current-sharing among parallel-connected switch elements due to deviations in on-resistance distribution, temperature coefficients, and parasitic inductances, leading to reduced output stability and lifespan.
Innovation Solution
A power switching circuit with separate driving circuits for each switch element, where the turn-on and turn-off times are staggered to avoid transient current-sharing inconsistencies, distributing switching and turn-off losses evenly between elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If multiple switch elements are connected in parallel to increase power handling capability, then the power requirements and heat dissipation capacity are improved, but inconsistent current-sharing phenomenon occurs due to deviations in on-resistance distribution and temperature coefficients
Solution Approach 1:
The patent applies preliminary action by introducing separate driving circuits that preemptively control the switching timing of each parallel-connected switch element. The driving circuits are designed to account for deviations in on-resistance and temperature coefficients before they cause current-sharing inconsistencies, thereby maintaining reliable current distribution across all switch elements while preserving the enhanced power handling capability provided by the parallel configuration
2Device complexity
If synchronous turn-on and turn-off timing is used for simplicity, then the control complexity is reduced, but inconsistent transient current-sharing occurs due to parasitic inductances and resistance differences
Solution Approach 1:
The patent implements local quality by providing customized driving circuits for each switch element that locally compensate for individual parasitic characteristics. Each driving circuit is tailored to account for the specific parasitic inductance and resistance of its associated switch element, ensuring consistent transient current-sharing across all elements without requiring complex global control mechanisms
3Reliability
If staggered turn-on and turn-off times are implemented to avoid inconsistent current-sharing, then the current distribution uniformity is improved, but the control complexity and device complexity increase
Solution Approach 1:
The patent applies parameter changes by systematically adjusting the timing parameters of each driving circuit to achieve optimal staggered switching. By modifying the turn-on and turn-off timing parameters of individual driving circuits, the patent achieves uniform current distribution across parallel switch elements while keeping the complexity increase manageable through parameter optimization rather than structural complexity
Data Source
AI summary
A power switching circuit includes a driving signal part, a first switch element, a second switch element, a first driving circuit and a second driving circuit. The first driving circuit includes a first resistor and a first connection branch, which are connected between a positive driving signal terminal of the driving signal part and a first driving terminal of the first switch element, respectively. The second driving circuit includes a third resistor and a second connection branch, which are connected between the positive driving signal terminal and the second driving terminal of the second switch element, respectively. In a same switching cycle, the turn-on time of the first switch element is earlier than the turn-on time of the second switch element and the turn-off time of the first switch element is earlier than the turn-off time of the second switch element.