A single input symmetrical bipolar dual output dc-dc converter

Abstract

The invention discloses a single-input symmetrical bipolar double-output DC-DC converter, the positive pole of the first port is connected with one end of the first switch, the negative pole of the first port is connected with one end of the second switch, the first inductance One end, one end of the third capacitor, one end of the fourth capacitor, the negative pole of the second diode, the negative pole of the second port, and the negative pole of the third port are connected, and the other end of the first switch is connected to one end of the first capacitor, One end of the second capacitor is connected to the other end of the second switch, the other end of the first capacitor is connected to the positive pole of the first diode and the other end of the first inductor, and the negative pole of the first diode is connected to the third capacitor The other end of the second capacitor is connected to the positive pole of the second port, the other end of the second capacitor is connected to the positive pole of the second diode and one end of the second inductor, and the other end of the second inductor is connected to the other end of the fourth capacitor and the second capacitor. The anodes of the three ports are connected to each other, and the number of components of the converter is small and the cost is low.

Description

technical field [0001] The invention belongs to the technical field of power supply, and relates to a single-input symmetrical bipolar dual-output DC-DC converter. Background technique [0002] With the rapid development of power electronics technology, switching power supplies are widely used in various electrical equipment. At present, many applications require switching power supplies with high power density and capable of outputting positive and negative symmetrical output voltages, such as inverters, Class-D audio amplifiers, ultrasonic medical imaging systems, and auxiliary power supplies that require positive and negative power supplies. [0003] The traditional way to provide positive and negative voltage output is to use a forward (Forward) circuit or a flyback (Flyback) circuit with electrical isolation characteristics, and share the core of the transformer to wind the transformer with multiple output windings, so as to obtain more isolated positive and negative vo...

AI Technical Summary

Problems solved by technology

Forward and flyback require additional auxiliary circuits to eliminate the voltage spike of the switching tube, which increases the complexity of the converter and reduces the efficiency of the converter

[0004] In some occasions where positive and negative voltage outputs are provided, there are also plans to use two non-isolated switching converters. The two converters output positive voltage and negative voltage respectively, which eliminates the cross adjustment between the outputs, saves the transformer, and improves the conversion efficiency. efficiency, but this method requires two sets of controllers and two sets of main power circuits, more components and higher cost

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