multifunctional power converter

Abstract

The present invention relates to a multi-function power converter comprising an input filter unit, a voltage transformer, a switching transistor, a drive controller, a feedback unit and an output unit. A power supply converting function with dynamic detecting can be provided. A sensing signal from a primary coil and a sensing signal from a reference coil are combined into a current sensing zero detection signal so that a digital control unit determines whether a secondary current is discharged to zero and detects a bottom position and a bottom number to decide whether to turn on the switching transistor. Meanwhile, when the switching transistor is turned on, current sensing is performed to determine whether to turn off the switching transistor. Accordingly, the multifunctional power converter of the invention can greatly reduce switching loss and raise the power supply converting efficiency. In particular, the digital control unit is used; practical needs can be satisfied by means of updating firmware programs; and high elasticity is realized.

Description

technical field [0001] The present invention relates to a multifunctional power converter, in particular, the sensing signal from the primary side coil and the sensing signal from the reference coil are combined into a current sensing zero point detection signal, and received by a single signal pin to The digital control unit can judge whether the secondary side current is discharged to zero according to the current sensing zero point detection signal, and detect the valley bottom position and the number of valley bottoms, so as to decide whether to turn on the switching transistor and reduce the switching loss. At the same time, when the switching transistor is turned on , for current sensing to decide whether to turn off the switching transistor. Background technique [0002] Different electronic products require power supplies of different voltages or currents to operate. For example, integrated circuits (ICs) require 5V or 3V, electric motors require 12V DC, and lamp tub...

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Problems solved by technology

[0006] However, the disadvantage of the above prior art is that the drive controller must separately receive the sensing signal from the primary coil and the current sensing signal from the reference coil, so that the drive controller needs to be configured with two independent signal pins, and the first branch The piezoresistor and the second voltage dividing resistor will occupy a considerable area, which affects the cost of the overall circuit layout, especially when it is realized in the form of an integrated circuit.

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