Double step-down inverter

A lifting type and inverter technology, applied in the direction of converting AC power input to DC power output, output power conversion devices, electrical components, etc., can solve the problem of increasing the volume and weight of the whole machine, reducing power conversion efficiency, and increasing system complexity In order to achieve the effect of overcoming voltage distortion, reducing the loss of filter components, and uncomplicated circuit structure

Inactive Publication Date: 2007-05-23
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0002] The traditional inverter topology can almost be attributed to the buck-type step-down converter structure. In order to ensure the normal operation of the inverter, the bus voltage on the DC side must be greater than the peak output voltage. Taking the mains system as an example, the output is 220VAC, then The DC side bus voltage must reach at least 315VDC, which is unsatisfactory in most applications, so a DC / DC direct converter must be added before the inverter to boost the input voltage to the required DC side bus voltage
Compared with the single-stage structure, the two-stage structure of DC / DC straight-to-straight converter + DC / AC inverter increases the complexity of the system, increases the cost, increases the volume and weight of the whole machine, and reduces the overall power conversion efficiency

Method used

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Embodiment Construction

[0017] As shown in Figure 1, the dual-boost-boost inverter of this embodiment includes a capacitor voltage divider circuit 1, a first boost-boost voltage circuit 2 and a second voltage-boost circuit 4, wherein the capacitor voltage divider circuit 1 consists of two The first capacitor C1 and the second capacitor C2 are connected in series, the series connection point of the first capacitor C1 and the second capacitor C2 is grounded, the other end of the first capacitor C1 is connected to the positive pole of the external power supply, and the other end of the second capacitor C2 is connected to the external power supply in the first buck-boost circuit 2, the anode of the first power switch tube S1 is connected to the positive pole of the external power supply, the cathode of the first power switch tube S1 is connected to the cathode of the third power switch tube S3, and the third power switch tube The anode of S3 is connected to the cathode of the first power diode D1, one end...

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Abstract

The invention relates to a dual-reduction inverter, which comprises capacitor divide circuit, the first reduction circuit and the second reduction circuit, wherein the divide circuit is formed by two serially connected first and second capacitors; the first reduction circuit has the first power switch tube, the third power switch tube and the first inductance; the second reduction circuit has the second power switch tube, the fourth power switch tube and the second inductance; the load is connected between the anode of first power diode and the cathode of second power diode. The invention has the advantages that: when the input bus voltage is lower than output voltage, the inverter also can operate invert operation, with simple structure and simple control.

Description

1. Technical field [0001] The invention relates to an inverter in an electric energy conversion device, in particular to an inverter capable of step-down inversion and step-up inversion. 2. Background technology [0002] The traditional inverter topology can almost be attributed to the buck-type step-down converter structure. In order to ensure the normal operation of the inverter, the bus voltage on the DC side must be greater than the peak output voltage. Taking the mains system as an example, the output is 220VAC, then The DC side bus voltage must reach at least 315VDC, which is unsatisfactory in most applications, so a DC / DC direct converter must be added before the inverter to boost the input voltage to the required DC side bus voltage. Compared with the single-stage structure, the two-stage structure of DC / DC straight-to-straight converter + DC / AC inverter increases the complexity of the system, increases the cost, increases the volume and weight of the whole machine,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/515
Inventor 洪峰张喻刘大刚严仰光龚春英陈新於俊
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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