Zero-voltage switching power supply-capacitor series DC converter and its working method
A technology of DC converter and power conversion, which is applied in the direction of high-efficiency power electronic conversion, conversion equipment without intermediate conversion to AC, climate sustainability, etc., and can solve problems such as large voltage stress, low conversion efficiency, and high cost
Active Publication Date: 2017-05-10
SHANDONG UNIV
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- Application Information
AI Technical Summary
Problems solved by technology
[0005] (1) The voltage stress of the switch tube and diode is the DC output voltage value, and the voltage stress is relatively large;
[0006] (2) When hardware engineers select semiconductor devices, they must choose semiconductor devices with a withstand voltage higher than the DC output voltage value, resulting in high costs;
[0007] (3) In addition, under the condition of high boost ratio, the current stress of the main switch tube and the main diode is relatively large, resulting in a decrease in conversion efficiency
Method used
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Embodiment Construction
[0060] Below in conjunction with accompanying drawing and embodiment the present invention will be further described:
[0061] Such as figure 1 As shown, a zero-voltage conversion power supply-capacitor series DC converter includes: a power supply circuit and a main power circuit;
[0062] The power supply circuit includes a DC power supply S connected in series in sequence 1 , central capacitance C cen and the DC power supply S 2 , the power supply circuit supplies power to subsequent circuits or loads;
[0063] The main power circuit includes a first main power circuit and a second main power circuit, and the first main power circuit is connected in parallel to the central capacitor C cen with DC power supply S 2 The common point and the DC power supply S 1 between the positive poles; the second main power circuit is connected in parallel with the central capacitor C cen with DC power supply S 1 The common point and the DC power supply S 2 between the negative poles...
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The invention discloses a zero-voltage-transition power supply-capacitor series connection type DC converter and a working method thereof. The zero-voltage-transition power supply-capacitor series connection type DC converter comprises a power supply circuit and main power circuits. The power supply circuit comprises a DC power supply S1, a center capacitor Ccen and a DC power supply S2 which are connected in series in turn. The power supply circuit supplies power to post-stage circuits or loads. The main power circuits comprise a first main power circuit and a second main power circuit. The first main power circuit is connected in parallel between the common point of the center capacitor Ccen and the DC power supply S2 and the positive electrode point of the DC power supply S1. The second main power circuit is connected in parallel between the common point of the center capacitor Ccen and the DC power supply S1 and the negative electrode point of the DC power supply S2. Switching loss of a main switching tube and a main diode of the power supply-capacitor series connection type DC converter is greatly reduced so that conversion efficiency of the converter is greatly enhanced.
Description
technical field [0001] The invention relates to a soft switching circuit, in particular to a zero-voltage conversion power supply-capacitor series DC converter and a working method thereof. Background technique [0002] Since modern times, with the continuous consumption of fossil energy, human beings are facing an unprecedented energy crisis. Photovoltaic power generation technology has been widely used because it provides a steady stream of renewable electricity for human society without consuming any fossil energy. [0003] As the core component of the entire photovoltaic power generation system, photovoltaic inverters are crucial to their operating efficiency and performance. Currently widely used distributed non-isolated photovoltaic grid-connected inverters widely adopt a two-stage topology, and the first-stage DC-DC conversion circuit mostly adopts a boost converter with a zero-voltage conversion circuit. The zero-voltage transfer circuit significantly reduces the s...
Claims
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IPC IPC(8): H02M3/07
CPCY02B70/10
Inventor 高峰陈梦星
Owner SHANDONG UNIV