Low-potential distribution capacitor power supply module

Abstract

The invention discloses and provides a low-potential distribution capacitor power supply module, which adopts a longitudinal wave mode, and an acoustic window material is added between a primary stage and a secondary stage of a transducer, so that the potential distribution capacitance is reduced to be 0.1% or below of that of a conventional module, and the coupling of space interference signals is effectively blocked. The ultrasonic transducer comprises an input driving circuit, a ceramic transduction assembly and an output rectifying and voltage stabilizing circuit, the ceramic transduction assembly comprises an input ceramic transducer, an output ceramic transducer and a silica gel acoustic window material, the driving circuit is electrically connected with the input ceramic transducer, the output rectifying and voltage stabilizing circuit is electrically connected with the output ceramic transducer, and the silica gel acoustic window material is electrically connected with the output rectifying and voltage stabilizing circuit. Energy transmission in a longitudinal wave mode is realized. The power module is applied to the technical field of power modules.

Description

technical field [0001] The invention relates to a power supply technology, which is mainly applied to the module power supply technology in equipment with strict requirements on power supply EMC, and particularly relates to a low potential capacitance power supply module. Background technique [0002] Among the current mainstream power modules in the market, the technical focus is mainly on conventional indicators such as ripple, noise, load regulation and output voltage stability at the output of the power supply, but almost all the power modules in circulation ignore a A performance index under the condition of extremely strict anti-interference requirements - submerged capacitance, when this type of power module is used in a micro-signal processing circuit, even if the parameters such as ripple and noise are excellent, it is still found A lot of interference occurs in actual use, and the introduction of interference once became a difficult problem in the design of medical...

AI Technical Summary

Problems solved by technology

[0012] Conventional power modules cause large hidden cloth capacitance. One reason is that the distance between the primary and secondary of the internal transformer is too close. It is generally designed as a sandwich winding method (or called a thousand-layer cake winding method), and the energy coupling is tight, which can obtain better Good power electrical performance, but reduces EMC performance. Generally, the latent capacitance of this winding method is nF level, ranging from 1nF to tens of nF

Another reason is that on the power circuit PCB, the circuit cross layout increases the parasitic capacitance between the input and output circuits to a certain extent.

Also, because of EMI requirements, a Y capacitor is added, which is further equal to a capacitor connected in parallel between the primary and secondary, which is further enlarged, forming a dead angle in the design of conventional modules.

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