Resonant transformation circuit applied to medical equipment and provided with synchronous rectification control

Abstract

The invention belongs to a circuit system applied to signal controlling and processing of medical equipment and particularly relates to a resonant transformation circuit applied to medical equipment and provided with synchronous rectification control. The technical scheme provided by the resonant transformation circuit does not need a delay circuit, body diode voltage of a synchronous rectifier tube is not detected, and voltage signals are obtained directly after current in a secondary side winding is converted into low current through a current transformer, thereby reducing opening time of a body diode of the secondary side rectifier tube as much as possible, and further improving efficiency. Simultaneously, a current directly-driving method in the secondary side winding is adopted, thereby avoiding alternating conduction of an upper tube and a lower tube, and enhancing reliability of circuits in the medical equipment. In addition, the resonant transformation circuit does not need additional control circuits or zero passage detection, only needs the current transformer to convert the current into the low current so as to conveniently form driving voltage to drive a winding reset circuit of the current transformer, and is simple in circuit and low in cost.

Description

technical field [0001] The invention belongs to a signal control and processing circuit system applied to medical equipment, in particular to a resonant conversion circuit with synchronous rectification control applied to medical equipment. Background technique [0002] The development trend of switching power supply is miniaturization and light weight, which means high efficiency and high power density, and also puts forward higher requirements for electromagnetic compatibility. In terms of high power density, by increasing the operating frequency, the number of turns of each winding of the transformer can be reduced and the size of the core can be reduced, thereby miniaturizing the transformer. Therefore, the most direct way to miniaturize and lighten the switching power supply is to increase the frequency of the circuit. However, when the switching frequency is increased, the switching loss will increase, the circuit efficiency will drop seriously, and the electromagnetic...

AI Technical Summary

Problems solved by technology

Due to the process of current detection, there is always a certain delay between the output control signal and this will lead to the conduction of the body diode of the body synchronous rectifier switch, which will affect the improvement of efficiency, especially at low voltage and large In the case of current, there is still room for efficiency improvement, especially in the field of medical equipment, the improvement of efficiency is particularly important

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