PCB Gate Drive Layout Using Negative Supply Solid Pattern
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Solution Overview
Problem
Conventional switching circuits face issues with erroneous turning on of switching elements due to noise interference, especially when the difference between the ground potential and turn on voltage is small, and existing negative power supply circuits do not adequately address this problem.
Innovation Solution
A novel switching circuit design that includes a printed circuit board with a switching element, a positive power supply circuit, a negative power supply circuit, and a driving circuit, where the negative power supply wiring incorporates a negative power supply solid pattern to reduce impedance and potential difference, thereby minimizing noise-induced erroneous turning on.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ground potential is applied to gate electrode to turn off switching element, then switching element is turned off, but switching element is erroneously turned on by noise due to small voltage difference
Solution Approach 1:
The patent changes the voltage parameter applied to the gate electrode from ground potential (0V) to negative potential (-Ve). This parameter change increases the voltage difference between the turn-on voltage and the off-state voltage, creating a larger noise margin that prevents erroneous turning on due to noise interference.
2Reliability
If negative power supply circuit is used to apply negative voltage to gate electrode, then erroneous turning on is reduced, but voltage fluctuation occurs due to wiring impedance
Solution Approach 1:
The patent applies local quality by providing a solid pattern specifically in the negative power supply wiring portion that connects to the gate electrode, while other wiring portions may have different characteristics. This localized solid pattern reduces the impedance specifically where it matters most (at the gate electrode connection point), thereby stabilizing the negative voltage at the critical location without requiring the entire wiring system to be solid pattern.
3Stability of the object's composition
If solid pattern is provided in negative power supply wiring, then impedance and voltage fluctuation are reduced, but manufacturing complexity increases
Solution Approach 1:
The patent applies local quality by providing a solid pattern specifically in the negative power supply wiring portion that connects to the gate electrode, while other wiring portions may have different characteristics. This localized solid pattern reduces the impedance specifically where it matters most (at the gate electrode connection point), thereby stabilizing the negative voltage at the critical location without requiring the entire wiring system to be solid pattern.
Data Source
AI summary
A switching circuit includes a printed circuit board that supports a switching element, a positive power supply circuit, a negative power supply circuit and a driving circuit thereon. The positive power supply circuit generates a positive voltage relative to a GND potential. The negative power supply circuit generates a negative voltage relative to the GND potential. The driving circuit supplies the gate electrode with the positive voltage and the negative voltage when turn on and off the switching element, respectively. The printed circuit board includes wiring as a conducting path extended from the negative power supply circuit to the gate electrode via the driving circuit. The conducting path includes a negative power supply wiring between the negative power supply circuit and the driving circuit. The negative power supply wiring at least partially includes a negative power supply solid pattern.