Series resonance DC/DC converter of photovoltaic system

A series resonance and series resonance circuit technology, applied in the field of DC/DC converters, can solve the problems of difficulty in controlling the on-off of switching devices, large occupancy of switching devices, affecting grid-connected stability, etc. The effect of high voltage ratio and no switching loss

Inactive Publication Date: 2011-02-16
刘闯
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Problems solved by technology

However, the boosting range of the Boost circuit is limited. When the voltage is greatly boosted, the duty ratio of the switching device is large, it is difficult to control the on-off of the switching device, and the output voltage is eas

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  • Series resonance DC/DC converter of photovoltaic system
  • Series resonance DC/DC converter of photovoltaic system
  • Series resonance DC/DC converter of photovoltaic system

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Embodiment Construction

[0014] The embodiments of the present invention are described in detail below in conjunction with the accompanying drawings: the present embodiment is implemented on the premise of the technical solution of the present invention, and detailed implementation methods and processes are provided, but the protection scope of the present invention is not limited to the following implementations example.

[0015] Such as figure 1 As shown, the embodiment according to the present invention includes: voltage stabilizing capacitor 8, unipolar converter 40, series resonant circuit 50, high frequency isolation transformer 16 and fast uncontrolled rectifier 20, wherein: voltage stabilizing capacitor 8 enhances the output voltage of photovoltaic array stability; the unipolar converter 40 is used to convert the DC voltage 26 of the photovoltaic array 10 into a unipolar pulse voltage; the series resonant circuit 50 is used to convert the unipolar pulse voltage into a sinusoidal voltage with a...

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Abstract

The invention relates to a series resonance DC/DC converter of a photovoltaic system, which comprises a single-pole converter (40), a series resonance circuit (50), a high-frequency isolation transformer (16) and a rapid uncontrollable rectifier (20), wherein the single-pole converter (40) is used for converting a direct voltage (26) of a photovoltaic array (10) into a single-pole pulse voltage; the series resonance circuit (50) is used for converting the single-pole pulse voltage into a sine voltage with a fixed frequency; the high-frequency isolation transformer (16) is used for boosting and isolating as well as protecting; and the rapid uncontrollable rectifier (20) is used for rectifying the high-frequency sine voltage into a stable direct current voltage (28). The converter (100) is only provided with two switching elements, has the advantages of simple control mode and no switching loss, and can be used for boosting and stabilizing the larger photovoltaic array so as to be convenient for synchronizing through a three-phase converter or charging a storage battery.

Description

technical field [0001] The invention relates to a DC / DC converter, in particular to a DC / DC converter with variable input voltage, high frequency, series resonant soft switch and used in a photovoltaic power generation system. Background technique [0002] The DC / DC converter is a conversion circuit that uses semiconductor switching devices to cooperate with inductors, capacitors, transformers and other devices to control the output DC voltage by controlling the rapid on and off of the semiconductor switching devices. , The uncontrollable DC voltage is transformed into a controllable DC voltage that meets the system requirements. In the photovoltaic power generation system, because the output voltage of the photovoltaic array varies drastically with conditions such as temperature and light intensity, it cannot be directly connected to the three-phase inverter to feed power to the three-phase grid. [0003] At present, in domestic and foreign photovoltaic inverter systems, D...

Claims

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Application Information

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IPC IPC(8): H02M3/28H02M3/338
CPCY02E10/56Y02B70/1433Y02B70/10
Inventor 刘闯
Owner 刘闯
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