Micro-power DC-DC power supply and manufacturing method thereof

Abstract

The embodiment of the invention discloses a micro-power DC-DC power supply and a manufacturing method thereof. The power supply comprises a drive control circuit which receives an input voltage and generates two groups of pulse-width modulation (PWM) drive waveforms having the same amplitude and a phase difference of 180 degrees, wherein the PWM drive waveforms are used for driving a push-pull switch in a push-pull conversion circuit connected with the drive control circuit to be turned on alternately; the push-pull conversion circuit uses the alternate turning on of the push-pull switch to enable a power output transformer to realize voltage conversation; the power output transformer is connected with an output rectifying circuit to output direct current voltage through the output rectifying circuit without using the saturated characteristic of a magnetic core of the power output transformer to realize the turning of a self excited oscillation circuit; and the power output transformer works in an unsaturated state and therefore, can transfer energy with the highest efficiency.

Description

Technical field [0001] The present invention relates to the technical field of circuit control, in particular to a micro-power DC-DC power supply and a manufacturing method thereof. Background technique [0002] Micropower DC-DC module power supplies are widely used in computer-led industrial control equipment, fieldbus, instrumentation, medical equipment, RS485 / 232 and other electronic equipment such as communication interface circuit and auxiliary power supply of high-power power supply have important application value, and it is an indispensable power supply method for the rapid development of electronic information products today. Especially with the rapid development of data services and the continuous promotion of distributed power systems, it has also promoted the rapid development of micro-power low-power DC-DC module power supplies. However, with the fierce market competition of modern electronic products, the development needs of low cost, miniaturization and portabili...

AI Technical Summary

Problems solved by technology

This production process uses a self-excited push-pull circuit with discrete components, and its operating frequency is relatively low. According to the inverse relationship between the frequency and the number of turns of the transformer, under the same cross-sectional area, the transformer needs more turns. In order to meet the requirements, it is relatively difficult to manufacture the transformer due to the large number of turns, and the test of the semi-finished transformer is also very complicated. It is difficult to test the performance of the semi-finished transformer in batches. It is easy to break the line during the production process such as sealing and testing, which will increase the defect rate of the finished product, complicate the production process, and cannot realize mechanical automation production, which will affect the quality of the product.

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