Single-input symmetrical bipolar double-output DC-DC converter

Abstract

The invention discloses a single-input symmetrical bipolar double-output DC-DC converter. The positive electrode of a first port is connected with one end of a first switch; the negative electrode ofthe first port is connected with one end of a second switch, one end of a second inductor, the positive electrode of a first diode, one end of a third capacitor, one end of a fourth capacitor, the negative electrode of a second port and the negative electrode of a third port; the other end of the first switch is connected with the other end of the second switch, one end of a first capacitor and one end of a second capacitor; the other end of the first capacitor is connected with the negative electrode of the first diode and one end of a first inductor; the other end of the first inductor is connected with the other end of the third capacitor and the positive electrode of the second port, the other end of the second capacitor is connected with the other end of the second inductor and the negative electrode of the second diode, the positive electrode of the second diode is connected with the other end of the fourth capacitor and the positive electrode of the third port, and the converteris small in number of devices and low in cost.

Description

technical field [0001] The invention belongs to the technical field of power supplies and relates to a single-input symmetrical bipolar double-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 can output positive and negative symmetrical output voltages, such as inverters, Class-D audio amplifiers, ultrasonic medical imaging systems, auxiliary power supplies that require positive and negative power supplies, etc. [0003] The traditional way to provide positive and negative voltage output is to use a forward circuit or flyback circuit with electrical isolation characteristics, and share the transformer core to wind the transformer with multiple output windings, thus obtaining multiple isolated positive and negative voltages. output converter. But t...

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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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