Single-stage two-way step down DC converter type high frequency link inverter

A technology of DC converters and inverters, applied in the direction of converting DC power input to DC power output, irreversible DC power input converting to AC power output, and converting equipment with intermediate conversion to AC, etc., can solve the problem of high cost. , low power density and reliability, to achieve the effect of low cost, low audio noise, and small output voltage ripple

Active Publication Date: 2009-01-28
FUZHOU UNIV
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  • Application Information

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Problems solved by technology

[0005] Although the above high-frequency link inverters such as unidirectional Buck type, unidirectional Buck type high-frequency pulsed DC link, bidirectional Buck type, bidirectional Buck-Boost type, two-stage Buck or Buck-Boost DC converter type have many advantages, However, they are all two-stage or quasi-two-stage converter cascaded circuit structures, and there are still defects such as low conversion efficiency, power density and reliability, and high cost.

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  • Single-stage two-way step down DC converter type high frequency link inverter
  • Single-stage two-way step down DC converter type high frequency link inverter
  • Single-stage two-way step down DC converter type high frequency link inverter

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Embodiment Construction

[0014] The circuit structure of single-stage bidirectional Buck DC converter type high-frequency link inverter is composed of two identical high-frequency electrical isolation bidirectional power flow Buck DC converters that output anti-phase low-frequency sinusoidal pulsating DC voltage and are composed of differential circuits, such as figure 1 , 2 shown. Among them, Figure 2(a) is the circuit structure, and Figure 2(b) is the waveform of the circuit principle. Due to the instantaneous value u of the low-frequency sinusoidal pulsating DC voltage output by each high-frequency electrical isolation bidirectional power flow Buck DC o1 and u o2 are lower than the input DC voltage U i and high frequency transformer turns ratio N 2 / N 1 The product of (U i N 2 / N 1 ), so it is called a single-stage bidirectional step-down DC converter type high-frequency link inverter. Each high-frequency electrical isolation bidirectional power flow Buck DC converter consists of an input f...

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Abstract

This invention relates to a mono-pole two-way step-down DC converter high frequency link inverter, the circuit of which is composed of two same high frequency electric isolated two-way power flow step-down DC converters outputting inverse low frequency sine pulse DC voltages in differential circuit, which can convert a DC voltage to necessary sine AC voltage having the advantages of simple circuit topology, isolated AC load and DC supply high frequency, two-way power flow, mono-pole power transformation and small volume.

Description

technical field [0001] The single-stage bidirectional step-down (Buck) DC converter type high-frequency link inverter involved in the present invention belongs to the power electronic conversion technology. Background technique [0002] The inverter is a static conversion device that uses power semiconductor devices to convert direct current into alternating current for use with alternating current loads. An inverter with high-frequency electrical isolation between the output AC load and the input DC power supply is called a high-frequency link inverter. High-frequency link inverter, because the transformer used to realize the output and input electrical isolation and voltage matching function is above 20kHz, its volume, weight and audio noise are greatly reduced, and the shortcomings of the low-frequency link inverter are overcome. It has wide application prospects in the inverter occasions where DC generators, storage batteries, solar cells and fuel cells are the main DC ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/48H02M7/537H02M3/28H02M3/335H02M1/14
Inventor 陈道炼
Owner FUZHOU UNIV
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