Parallel Power Device Driving Circuit With Common Magnetic Bead
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Solution Overview
Problem
Power devices connected in parallel experience differences in switching moments due to variations in driving circuit parameters and switching characteristics, leading to uneven current sharing, increased switching losses, and a risk of overheating or damage.
Innovation Solution
A driving circuit configuration where all power devices are connected to a common magnetic bead, ensuring consistent parasitic inductance and synchronized switching moments, thereby reducing high-frequency oscillations and improving current sharing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If power devices are connected in parallel to increase output power, then the power output is improved, but the current sharing becomes uneven due to differences in driving circuit parameters and switching characteristics
Solution Approach 1:
The patent merges the inductance functions by connecting all power device control terminals to a common magnetic bead, creating a shared inductive element that equalizes the switching characteristics across parallel power devices. This combining approach ensures that all devices experience the same inductive effect, thereby achieving uniform current sharing while maintaining the increased power output capability.
2Ease of operation
If individual magnetic beads are used for each power device to control switching, then the switching control is improved, but the device complexity and parameter variations increase
Solution Approach 1:
The patent combines multiple individual magnetic bead functions into a single common magnetic bead that serves all power devices simultaneously. This merging reduces the total component count and circuit complexity while maintaining effective switching control, as the common magnetic bead provides unified inductive control for all parallel power devices.
3Productivity
If different driving circuit parameters are used for each power device, then the individual device performance is optimized, but the switching moments become inconsistent leading to increased switching losses
Solution Approach 1:
The patent creates equipotential switching conditions by connecting all power device control terminals to a common magnetic bead, ensuring that all devices experience identical inductive effects and switching characteristics. This equipotential approach synchronizes the switching moments across all power devices, eliminating the energy losses that would result from asynchronous switching while maintaining individual device performance optimization.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution ensures consistent switching moments and reduced switching losses across power devices, minimizing the risk of overheating and damage, and enhancing the safety and efficiency of power device operation.
Implementation Method 1
A driving circuit configuration where all power devices are connected to a common magnetic bead, ensuring consistent parasitic inductance and synchronized switching moments
Data Source
AI summary
The present application provides a driving circuit of power devices, a switching circuit and a power conversion circuit. The driving circuit is configured to control switching actions of N power devices connected in parallel, where N≥2 and N is a positive integer; the driving circuit includes a driving input circuit and a common magnetic bead, where a first end of the driving input circuit is electrically connected to N first ends of the common magnetic bead, N second ends of the common magnetic bead are electrically connected to control ends of the N power devices in a one-to-one correspondence, and a second end of the driving input circuit is electrically connected to second ends of the N power devices.