A Design Method for Low Stray Inductance Loop of High Frequency Inverter

Abstract

The invention belongs to the technical field of high-frequency inverters, and particularly relates to a method for designing a low-stray inductance loop of a high-frequency inverter. A main busbar ofa converter loop is of a laminated structure and comprises two layers cooper bars including positive copper bars and negative copper bars, and the width, the length and the thickness of the positive copper bars and the negative copper bars are the same. The size specification of the main busbar under the expected inductance value is determined according to the width and length of the copper bars in the main busbar and the influence of the distance between the two layers of copper bars on the stray inductance of the main busbar. An absorption capacitor module is arranged on the main busbar andis used for inhibiting voltage spike caused by busbar inductance and reducing loop equivalent inductance. The absorption capacitor module comprises a plurality of small capacitors arranged in parallel, and the capacitance values of the small capacitors in the absorption capacitor module are determined through an equivalent circuit of the double-pulse test circuit. Based on the joint simulation ofQ3D and simplorer, the number of small capacitors in an absorption capacitor module is changed or the size specification of a main busbar is changed, so that a power loop conforming to the expected value of the final inductance is obtained.

Description

technical field [0001] The invention belongs to the technical field of high-frequency inverters, and in particular relates to a design method for a low stray inductance circuit of a high-frequency inverter. Background technique [0002] Inverters are widely used in many fields such as communication, transportation and electric power, and are developing towards high frequency, high efficiency and small size. As the requirements for the size and efficiency of the inverter increase, its operating frequency must continue to increase. Faster switching speeds lead to switching devices that are more sensitive to stray inductance, which is prone to serious problems during switching, such as voltage stress, electromagnetic interference, and extra power loss. Therefore, high-frequency inverters have more stringent requirements on the stray parameters of the circuit, especially in high-power inverters, in order to eliminate the voltage overshoot problem caused by stray inductance, the...

AI Technical Summary

Problems solved by technology

In the high-frequency inverter, the switching speed is fast and the current change rate is large. The current change rate and the loop inductance will cause voltage overshoot, which will affect the normal use of power devices.

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