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Single-phase AC-DC/DC-AC dual-purpose circuit and three-phase AC-DC/DC-AC dual-purpose circuit

A DC-AC and circuit technology, applied in the field of single-phase or three-phase AC-DC/DC-AC dual-purpose circuits, can solve problems such as low efficiency, inability to be used as a DC-AC inverter, and large overall loss, and achieve The effect of high power density, low cost, and small number of components

Inactive Publication Date: 2016-08-17
TAIBAIJIN TECH SHENZHEN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a single-phase or three-phase AC-DC / DC-AC dual-purpose circuit, which aims to solve the traditional AC-DC technical solution with low efficiency and large overall loss, and cannot be used as a DC-AC inverter The problem

Method used

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  • Single-phase AC-DC/DC-AC dual-purpose circuit and three-phase AC-DC/DC-AC dual-purpose circuit
  • Single-phase AC-DC/DC-AC dual-purpose circuit and three-phase AC-DC/DC-AC dual-purpose circuit
  • Single-phase AC-DC/DC-AC dual-purpose circuit and three-phase AC-DC/DC-AC dual-purpose circuit

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] see figure 1 , the single-phase AC-DC / DC-AC dual-purpose circuit in the preferred embodiment of the present invention includes a PFC converter module 11, an intermediate level protection module 12, a non-isolated step-up / step-down module 13 and input and output protection modules connected in series. Module 14.

[0034] The PFC converter module 11 includes a first bridge arm 112, a second bridge arm 114, a filter capacitor C1 and an energy storage inductor L1; the first bridge arm 112, the second bridge arm 114 and the filter capacitor C1 connected in parallel; the first bridge arm 112 includes two main switch tubes Q1 and Q2 connected in series in the same direction, and the second bridge arm 114 includes two rectifier tubes Q3 and Q4 connected in series in the same direction; the energy storage inductor L1 One end is connected to the series node of the two main switching transistors Q1 and Q2, the other end is used as the first AC port 113, and the series node of the...

Embodiment 2

[0041] Another advantage of this technical solution is that energy can flow in both directions and can be used as a DC-AC inverter. Please refer to figure 2 , the non-isolated step-up / step-down module 13 here takes a Boost step-up converter as an example, and the Boost converter boosts an input voltage of, for example, 200Vdc to 400Vdc to another high voltage of 420Vdc. The PFC converter module 11 (serving as an inverter at this time) can adopt a SPWM (Sinusoidal Pulse Width Modulation, sinusoidal pulse width modulation) control method to invert the direct current output by the Boost converter into an alternating current output. If the main switching tube Q1 of the non-isolated boost / buck module 13 is short-circuited, the input and output protection module 14 cuts off the input side and the non-isolated boost / buck module 13 in time. If the main switching tubes Q3 to Q6 of the PFC converter module 11 are short-circuited, the intermediate protection module 12 can disconnect the...

Embodiment 3

[0043] see image 3 , if the non-isolated step-up / step-down module 13 adopts a Boost step-up converter, then there is image 3 The technical solution shown. For occasions where the efficiency requirement is not high, the freewheeling tube Q6 can use a rectifier diode, such as an ultra-fast recovery rectifier diode or a SiC diode. If a high-voltage rectifier is used, the traditional Si process MOSFET has disadvantages such as poor body diode reverse recovery characteristics and large junction capacitance, and the freewheeling tube Q6 should use a GaN Transistor switching device or a SiC MOSFET. A simple realization scheme of the protection stage is to short-circuit the protection switch S2 in the intermediate protection module 12 and the protection switch S4 of the input and output protection module 14, and use MOSFETs, relays, fuses, etc. for the protection switches S1 and S3. In the event of a short-circuit fault in the main switching tube Q5 , the protection switch S1 is t...

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Abstract

The invention discloses a single-phase or three-phase AC-DC / DC-AC dual-purpose circuit. The circuit comprises a PFC converter module, an intermediate stage protection module, a non-isolated pressure-boosting / lowering module and an input / output protection module which are in sequential series connection; the PFC converter module comprises one or more first bridge arms, a second bridge arm, a filter capacitor and one or more energy-storage inductor; the first bridge arms, the second bridge arm and the filter capacitor are in parallel connection; each first bridge arm comprises two main switch tubes which are in series connection in the same direction, and the second bridge arm comprises two rectification tubes which are in series connection in the same direction; one end of the energy-storage inductor is connected with a series connection node of the two main switch tubes, the other end of the energy-storage inductor serves as a first alternating current port, and a series connection node of the two rectification tubes serves as a second alternating current port; two external connection ports of the input / output protection module serve as two direct current ports respectively. According to the circuit, a small number of elements are used, cost is low, conversion efficiency is high, power intensity is high, and the circuit is particularly applicable to the situation that the output voltage is wide in adjustment range.

Description

technical field [0001] The invention relates to the field of rectifiers and inverters, in particular to a single-phase or three-phase AC-DC / DC-AC dual-purpose circuit. Background technique [0002] The improvement of conversion efficiency and power density is an important challenge for power electronics technology. Improving conversion efficiency can reduce losses, reduce the difficulty of thermal management, and ultimately achieve higher power density. In order to improve conversion efficiency, breakthroughs must be made in power electrical devices, topology and control. [0003] The traditional AC-DC technical solution uses a traditional PFC converter with a rectifier bridge and an isolated DC-DC converter. The loss of the rectifier bridge is very large, especially at low voltage and full load; because of the loss of the rectifier bridge, the efficiency of the entire converter is significantly reduced, and the temperature rise and thermal stress of the rectifier bridge a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/797
CPCH02M7/797Y02B70/10
Inventor 钟小芬
Owner TAIBAIJIN TECH SHENZHEN CO LTD
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