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Isolated bidirectional converter device
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A bidirectional converter and bidirectional conversion technology, applied in output power conversion devices, conversion equipment with reversible, conversion equipment with intermediate conversion to AC, etc., can solve the problem of high bus voltage, large loss, and many switching devices. and other problems to achieve the effect of preventing overvoltage and undervoltage, preventing backflow of power flow, and simplifying monitoring design
Pending Publication Date: 2019-05-17
SHENZHEN YINGFEIYUAN TECH CO LTD
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[0003] When the traditional non-isolated bidirectional AC-DC converter is applied to the above-mentioned markets, it needs to add a power frequencytransformer on the AC side for isolation, which has the disadvantages of large volume and large loss, and is not suitable for the high-efficiency and high-power of the above-mentioned emerging markets. Density Application Requirements
In "A Three-phase AC and DC Bidirectional Converter" (Patent No. CN202406057U), the topology of the main circuit is controlled by a digital controller (DSP) on the primary side, which requires complex isolated sampling and isolated drive circuits. Only single-bus voltage mode is used, and the bus voltage is relatively high, which brings great difficulties to the selection of bus capacitors and bus voltage sampling
In "Power Conversion Device and Power Conversion Method" (patent application number CN201611056616.6), the main circuit adopts a three-level series topology to achieve a bidirectional conversion function, and the latter two-level topology uses a fixed-frequency LLC circuit plus a buck-boost circuit The way to realize DC / DC bidirectional conversion, the topology of the main circuit is complicated, and there are many switching devices, which cannot achieve the optimal efficiency of the whole machine
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Embodiment 1
[0054] Figure 14 The circuit diagram of the first embodiment of the isolated bidirectional converter of the present invention is given. Figure 14 The isolated bidirectional converter device shown in includes power port 1, power port 2, three-phase bridge circuit, bus capacitor, isolated DC-DC circuit, sampling circuit, drive circuit, first digital controller circuit and second Two digital controller circuits. The power port 1 and the power port 2 respectively support AC voltage input, DC voltage output, or AC voltage output, DC voltage input, or bidirectional input and output of DC voltage and DC voltage.
[0055] Three-phase bridge circuit, including first inductance L1, second inductance L2 and third inductance L3, first bus capacitor C1, second bus capacitor C2 and six switching MOS tube devices Q1~Q6, where Q1 and Q2 are connected in series The first bridge arm circuit, the second bridge arm circuit composed of Q3 and Q4 in series, the third bridge arm circuit composed...
Embodiment 2
[0061] Figure 15 The circuit diagram of the second embodiment of the isolated bidirectional converter of the present invention is given. Figure 15 The isolated bidirectional converter device shown in , includes power port 1, power port 2, three-phase LC filter circuit, three-phase bridge circuit, bus capacitor, isolated DC-DC circuit, sampling circuit, drive circuit, first A digital controller circuit and a second digital controller circuit.
[0062]The Ua, Ub, and Uc fire wires of the power port 1 are respectively connected to one end of the inductors L5, L6, and L7, and the other ends of the inductors L5, L6, and L7 are connected to one end of the first inductor L1, the second inductor L2, and the third inductor L3, And connected to one end of the filter capacitors C5, C6, C7, the other end of the capacitors C5, C6, C7 is connected to the neutral line of the power port 1.
[0063] Three-phase bridge circuit, including first inductance L1, second inductance L2 and third i...
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Abstract
The present invention discloses an isolated bidirectional converter device. The device comprises a first unit conversion circuit and a second unit conversion circuit which are both bidirectional conversion circuits, the second unit conversion circuit at least comprises one isolation transformer. The isolated bidirectional converter device further comprises a first digital controller, a second digital controller and an isolation circuit. The first digital controller is electrically connected with the first unit conversion circuit, and the second digital controller is electrically connected withthe second unit conversion circuit. The two digital controllers are employed to timely switch off the respectively controlled unit conversion circuits in abnormal conditions to avoid a condition of generation of power flow backward. The isolated bidirectional converter device can achieve isolated bidirectional conversion of an alternating voltage and a direct voltage and isolated bidirectional conversion of a direct voltage and a direct voltage, and is high in power density, high in efficiency and flexible in the external communication mode.
Description
technical field [0001] The invention relates to the field of power electronic products, in particular to an isolated bidirectional converter device. Background technique [0002] With the development of microgrid technology and energy storage technology, the research on bidirectional AC-DC converter technology has received extensive attention. The bidirectional AC-DC converter can be used for bidirectional conversion of AC voltage and DC voltage, and energy can flow bidirectionally at the input and output ends of the converter. [0003] When the traditional non-isolated bidirectional AC-DC converter is applied to the above-mentioned markets, it needs to add a power frequencytransformer on the AC side for isolation, which has the disadvantages of large volume and large loss, and is not suitable for the high-efficiency and high-power of the above-mentioned emerging markets. density application requirements. In "A Three-phase AC and DC Bidirectional Converter" (Patent No. CN...
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