Buck circuit parameter determination method and device

Abstract

The invention provides a Buck circuit parameter determination method and a Buck circuit parameter determination device. The Buck circuit parameter determination method comprises the steps of: firstly,determining a duty ratio, and acquiring an inductor inductance initial value and a capacitor capacitance initial value based on a switching frequency initial value; and then judging whether the inductor inductance initial value and the capacitor capacitance initial value meet an intrinsic safety requirement, so as to obtain a final inductor inductance value, a final capacitor capacitance value and a final switching frequency. The Buck circuit parameter determination method and the Buck circuit parameter determination device can guarantee that a Buck circuit satisfies ripple performance requirements, and can enable the Buck circuit to meet the intrinsic safety performance requirement; the inductor inductance initial value and the capacitor capacitance initial need to be subjected to judgment of intrinsic safety requirement, and the precision of the final inductor inductance value, the final capacitor capacitance value and the final switching frequency is significantly improved; and aninductor is separated from a capacitor by utilizing extremum solution, complicated iterative solution process is not required, the process is simple and the implementation is easy.

Description

technical field [0001] The invention relates to the technical field of explosion-proof electrical safety, in particular to a method and device for determining parameters of a Buck circuit. Background technique [0002] The buck circuit used in the explosive gas environment needs to cooperate with the fast protection through reasonable parameters to make the intrinsic safety performance of the buck circuit meet the requirements. Since the Buck circuit has the conduction process and cut-off process of the switch tube, the energy storage and release process of the inductor and the capacitor, the Buck circuit is a composite circuit and cannot directly use the minimum ignition voltage (Minimum Igniting Voltage, GB3836.4-2010, MIV) curve and the minimum ignition current (MinimumIgniting Current, MIC) curve determine the parameters of the Buck circuit, the overall energy constraints must be imposed. The parameters of the Buck circuit must meet both ripple performance requirements ...

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the defect that the Buck circuit in the prior art does not meet the requirements of intrinsic safety performance, the present invention provides a method and device for determining the parameters of the Buck circuit, firstly determine the duty cycle, and obtain the initial value of the inductance value based on the initial value of the switching frequency and the initial value of the capacitance value; then judge whether the initial value of the inductance value and the initial value of the capacitance value meet the intrinsic safety requirements. Inductance value, capacitance value and switching frequency, otherwise determine the final switching frequency according to the initial value of the inductance value and the initial value of the capacitance value, and update the initial value of the inductance value and the initial value of the capacitance value according to the final switching frequency to obtain the final The inductance value and capacitance value can not only ensure that the buck circuit meets the ripple performance requirements, but also make the buck circuit meet the intrinsic safety performance requirements

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