Low-noise high-efficiency isolation converter suitable for power supply for medical testing and control method

Abstract

The invention discloses a low-noise efficient isolating converter suitable for a power supply for medical detection and a control method of the low-noise efficient isolating converter and belongs to the technical field of power electronic converters. The low-noise efficient isolating converter suitable for the power supply for medical detection is composed of a primary circuit, a transformer and an auxiliary circuit. The primary circuit comprises an input source, two switch tubes and two capacitors. The auxiliary circuit comprises three inductors, four diodes, two switch tubes, an output filter capacitor and a load. By the adoption of the low-noise efficient isolating converter suitable for the power supply for medical detection and the control method of the low-noise efficient isolating converter, soft switching of all switch devices can be achieved, the switching noise of the converter is effectively lowered, and conversion efficiency is remarkably improved; output current ripples can be effectively reduced, and the capacitance and the size of an output filtering capacitor are greatly reduced; boosting can be achieved through a rectifying circuit, and the low-noise efficient isolating converter is suitable for isolating boosting power conversion; control is easy, and reliability is high; the low-noise efficient isolating converter is particularly suitable for the power supply for medical detection and other application occasions having special requirements for noise, reliability, safety, efficiency and the like.

Description

technical field [0001] The invention belongs to the technical field of isolated DC-DC power conversion, and in particular relates to a low-noise, high-efficiency isolation converter and a control method suitable for medical testing power supplies such as blood analyzers. Background technique [0002] Compared with power supplies in other fields, medical power supplies for modern medical testing equipment (such as blood analyzers, etc.) have more stringent requirements on the safety, reliability, noise, ripple, etc. of power supplies, and medical equipment power supplies must meet Relevant regulations on safety, leakage, electromagnetic interference, radiation and protection. In order to meet the requirements of safety and reliability, and in order to adapt to the demand of the output voltage, an isolated DC converter is usually required. In order to meet the requirements of electromagnetic and radiation, how to reduce the noise of the power module itself, reduce the ripple ...

AI Technical Summary

Problems solved by technology

Resonant soft-switching converters, such as LLC resonant converters, can realize soft switching of all switching tubes and diodes, but the converter needs to adopt frequency conversion control, which not only leads to complicated control, but also brings difficulties to the design of transformers, filters, etc. difficulty

In addition, the output current of the resonant converter is usually discontinuous, which is not conducive to the reduction of output current ripple

Using interleaved parallel technology can effectively reduce the output voltage and current ripple, but this requires the use of multiple converter modules at the same time, making the structure, design and control of the entire power system complex

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