Single-tube high-gain DC boost conversion circuit

Abstract

The invention discloses a single-tube high-gain DC boost conversion circuit, which comprises a first energy storage inductance, a second energy storage inductance, a first diode, a second diode, a third diode, a switch tube, The first filter capacitor and the second filter capacitor; one end of the first energy storage inductance is connected to the anode of the circuit, and the other end is connected to the anode of the first diode and the anode of the second diode, and the first diode The cathode of the second diode is connected to the collector of the switch tube, the cathode of the second diode is connected to one end of the second energy storage inductor and one end of the first filter capacitor, and the other end of the second energy storage inductor is connected to the third diode The anode is connected, the other end of the second energy storage inductor is also connected to the collector of the switch tube, the cathode of the third diode is connected to one end of the second filter capacitor, the emitter of the switch tube, the other end of the first filter capacitor and The other end of the second filter capacitor is connected to the negative pole of the circuit. The circuit structure of the invention is simple, the control is convenient, and the efficiency of the circuit transmission power is high.

Description

technical field [0001] The invention belongs to the technical field of power conversion circuits, and in particular relates to a single-tube high-gain DC boost conversion circuit. Background technique [0002] In the photovoltaic power generation system, the voltage generated by the photovoltaic cell is low. Under normal circumstances, multiple units are connected in series to obtain a certain value of DC voltage, and the output voltage value is between several volts and tens of volts. Due to the following two reasons, it is necessary to configure a boost conversion circuit for it. First, due to changes in light intensity and incident angles, the voltage generated by the photocell changes. In order to allow the subsequent load to obtain maximum power, It is necessary to implement maximum power tracking control, that is, MPPT tracking control. The method of realization is to connect a step-up chopper circuit at the output terminal of the photovoltaic cell to control the outp...

AI Technical Summary

Problems solved by technology

Among these patents, the patents No. 1, 2, 3, 6, 7, and 9 are all two-tube switches and are assisted by relatively complex resistors, capacitors, and inductor networks, and even complex networks with coupled inductors to implement DC boost. Transformation, circuit control is more complicated, energy flow path is many, circuit efficiency is low

In the patents No. 4, 5, and 8, although only a single tube implements DC voltage boost control, the same is that the circuit structure is relatively complicated, and the number of components is large. Some converters contain coupled inductance components, and the mode of circuit work is relatively more, the efficiency of the circuit is not high

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