Buck-Boost voltage-regulating type voltage balance converter

Abstract

The invention discloses a Buck-Boost voltage-regulating type voltage balance converter. When an input DC voltage of the traditional converter greatly fluctuates, an output DC voltage of the traditional converter is instable. The Buck-Boost voltage-regulating type voltage balance converter comprises an input voltage source, a voltage-regulating switch circuit, a voltage balance circuit, a first state selection circuit and a second state selection circuit, wherein a first power switch tube S1 is connected in parallel with a diode D1; a second power switch tube S2 is connected in parallel with a diode D2; a third power switch tube S3 is connected in parallel with a diode D3; a fourth power switch tube S4 is connected in parallel with a diode D4; a fifth power switch tube S5 is connected in parallel with a diode D5, a sixth diode D6 and a second inductance L2; and a sixth power switch tube S6 is connected in parallel with a diode D7, an eighth diode D8, a ninth diode D9 and a third inductance L3. The Buck-Boost voltage-regulating type voltage balance converter can maintain that voltages at two ends of a DC voltage-dividing capacitor when loads at two poles of a DC power distribution network are not balanced; and when the input DC voltage greatly fluctuates, the output DC voltage is maintained to be stable.

Description

technical field [0001] The invention belongs to the application field of power electronics, in particular to a Buck-Boost voltage regulation type voltage balance converter. Background technique [0002] With the rapid development and wide application of new energy, new materials, information technology and power electronics technology, as well as the continuous improvement of users' requirements for power consumption, power quality and power supply reliability, the distribution network based on DC will definitely be more and more popular. more and more attention. In the DC distribution network, the use of two DC lines to transmit electric energy (that is, the unipolar DC distribution network) often cannot meet the input voltage requirements of various power converters and electrical equipment. For example, for a half-bridge inverter and a full-bridge inverter with the same output voltage, the input voltage of the half-bridge inverter is about twice that of the full-bridge i...

AI Technical Summary

Problems solved by technology

In the DC distribution network, the use of two DC lines to transmit electric energy (that is, the unipolar DC distribution network) often cannot meet the input voltage requirements of various power converters and electrical equipment.

For example, for a half-bridge inverter and a full-bridge inverter with the same output voltage, the input voltage of the half-bridge inverter is about twice that of the full-bridge inverter, and it is inconvenient to connect to the unipolar DC distribution network at the same time; The voltage required for lighting circuits is relatively low, while the input voltage required for household appliances such as refrigerators and air conditioners is relatively high, and the unipolar DC distribution network cannot simultaneously meet the input voltage requirements of various electrical equipment

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