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Start-up circuit of photovoltaic inverter auxiliary power supply

A photovoltaic inverter and starting circuit technology, applied in photovoltaic power generation, circuit devices, AC network circuits, etc., can solve problems such as auxiliary power supply shutdown, and achieve the effect of avoiding forced shutdown.

Active Publication Date: 2017-02-15
HUAWEI DIGITAL POWER TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The embodiment of the present invention provides a start-up circuit for the auxiliary power supply of the photovoltaic inverter, so as to avoid the problem that the auxiliary power supply is forced to shut down when the unloading circuit is closed

Method used

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  • Start-up circuit of photovoltaic inverter auxiliary power supply
  • Start-up circuit of photovoltaic inverter auxiliary power supply
  • Start-up circuit of photovoltaic inverter auxiliary power supply

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Embodiment Construction

[0026]The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0027] figure 1 It is a schematic diagram of the start-up circuit of the auxiliary power supply of the photovoltaic inverter applying an embodiment of the present invention. figure 1 It includes at least one solar panel 10 , a DC bus capacitor 20 , a starting circuit 30 and an auxiliary power supply 40 .

[0028] The starting circuit 30, the capacitor 20 of the DC bus, the auxiliary power supply 40 of the photovoltaic inverter, and at least one solar panel...

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Abstract

An embodiment of the present invention provides a start-up circuit for an auxiliary power supply of a photovoltaic inverter, the start-up circuit comprising: a power absorption circuit for absorbing the power output from the solar panel to the DC bus, and when the MPP of the solar panel When it is greater than or equal to the start-up power of the auxiliary power supply, stop absorbing the power output by the solar panel to the DC bus; start the control circuit, which is used to charge the capacitor on the DC bus to the first when the power absorbing circuit is turned off and When the auxiliary power supply is activated, the output voltage of the solar cell panel is the first voltage, and the output power of the solar cell panel is greater than the start-up power of the auxiliary power supply. In the embodiment of the present invention, by turning off the power absorbing circuit before starting the auxiliary power supply, and starting the chip of the auxiliary power supply when the output power of the solar panel is greater than the output power of the auxiliary power supply, the problem of forced shutdown of the auxiliary power supply is avoided.

Description

technical field [0001] Embodiments of the present invention relate to the field of photovoltaic inverters, and more specifically, relate to a starting circuit for an auxiliary power supply of a photovoltaic inverter. Background technique [0002] The commonly used methods of taking power for the auxiliary power supply of photovoltaic grid-connected inverters are divided into three types: taking power from the grid, taking power from the power grid and the DC bus of the photovoltaic inverter, and taking power from the DC bus of the photovoltaic inverter. Among them, when taking power through the first two ways of taking power, the auxiliary power supply needs to complete the AC / DC conversion, which requires a rectifier bridge and a large input capacitor, and at the same time, there will be standby loss at night. When taking power from the DC bus of the photovoltaic inverter, when the sunlight is weak due to weather, according to the output characteristics of the solar panel, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M1/36
CPCH02M1/36H02M3/33507H02J2300/24H02J3/381Y02E10/56
Inventor 石勇张彦忠晏帅华
Owner HUAWEI DIGITAL POWER TECH CO LTD