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Unloading circuit module for auxiliary power supply of photovoltaic inverter system

A photovoltaic inverter and auxiliary power technology, applied in photovoltaic power generation, electrical components, output power conversion devices, etc., can solve problems such as repeated start and stop of auxiliary power, to ensure controllability and stability, and avoid open-circuit status , Prevent the effect of false high voltage

Active Publication Date: 2012-07-11
EAST GRP CO LTD
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Problems solved by technology

[0007] The present invention aims to provide an unloading circuit module for the auxiliary power supply of the photovoltaic inverter system to solve the problem of repeated start and stop of the auxiliary power supply of the photovoltaic inverter. Only when the output power of the solar panel reaches Auxiliary power is activated only when a certain value is reached

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  • Unloading circuit module for auxiliary power supply of photovoltaic inverter system
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  • Unloading circuit module for auxiliary power supply of photovoltaic inverter system

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Embodiment Construction

[0015] In order to further understand the features, technical means, and specific objectives and functions achieved by the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0016] Such as figure 1 and figure 2 As shown, an unloading circuit module for the auxiliary power supply of a photovoltaic inverter system in the present invention includes a solar panel 10, an input bus capacitor 20, an auxiliary power supply 30, and an unloading circuit module 40. The unloading circuit module 40 is electrically It is connected between the input bus capacitor 20 and the auxiliary power supply 30 of the photovoltaic inverter system. When the photovoltaic inverter system uses a Boost circuit as the front stage, the input bus capacitor 20 is the output capacitor of the Boost circuit. , the auxiliary power supply 30 takes power from the bus capacitor 20 .

[0017] The auxiliary power ...

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Abstract

The invention discloses an unloading circuit module for an auxiliary power supply of a photovoltaic inverter system. The unloading circuit module comprises a solar panel, an input bus capacitor, the auxiliary power supply and the unloading circuit module. The unloading circuit module is electrically connected between the input bus capacitor and the auxiliary power supply; the unloading circuit module comprises a first resistor, a second resistor, a fourth resistor, a second switch tube and a photoelectric coupler; the first resistor is electrically connected between the input bus capacitor and a drain of the second switch tube; a source of the second switch tube is primarily grounded; a grid of the second switch tube is electrically connected to a collector of the photoelectric coupler; an emitter of the photoelectric coupler is primarily grounded; an anode of the photoelectric coupler is connected to an output end of the auxiliary power supply through the fourth resistor and a cathode of the photoelectric coupler is secondarily grounded. According to the unloading circuit module for the auxiliary power supply of the photovoltaic inverter system, provided by the invention, the problem of repeatedly starting and stopping the auxiliary power supply of the photovoltaic inverter is solved and the auxiliary power supply is started only when the power output by the solar panel reaches a certain value.

Description

technical field [0001] The invention relates to the field of photovoltaic inverter power supplies, in particular to an unloading circuit module used for an auxiliary power supply of a photovoltaic inverter system. 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, the...

Claims

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Application Information

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IPC IPC(8): H02M1/36
CPCY02E10/56
Inventor 陈书生郑照红郭晓露谷冬平
Owner EAST GRP CO LTD
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