A switching power supply and its control method

A switching power supply and control method technology, which is applied in the direction of electrical components, output power conversion devices, irreversible DC power input conversion to AC power output, etc., can solve the problem of large volume of photovoltaic grid-connected system and large space occupied by power resistor R1 and other issues to achieve the effect of reducing volume, avoiding large space occupation, and improving safety

Active Publication Date: 2022-04-08
SUNGROW POWER SUPPLY CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, in this solution, an additional power resistor R1 is required for discharge, and the power resistor R1 takes up a large space, which leads to a larger volume of the photovoltaic grid-connected system

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  • A switching power supply and its control method
  • A switching power supply and its control method
  • A switching power supply and its control method

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Embodiment Construction

[0085] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0086] In this application, the term "comprises", "comprises" or any other variation thereof is intended to cover a non-exclusive inclusion such that a process, method, article, or apparatus comprising a set of elements includes not only those elements, but also includes none. other elements specifically listed, or also include elements inher...

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Abstract

The present invention provides a switching power supply and its control method. In the switching power supply, the sources of electric energy received by the control power supply end of the main circuit include a first starting circuit and a second starting circuit. The main circuit, the first starting circuit and the second starting circuit The two starting circuits are powered by the DC bus of the inverter in the system where the switching power supply voltage is located; and the DC bus voltage value required by the second starting circuit to start the control function in the main circuit is lower than that of the first starting circuit; therefore, in When the voltage of the DC bus is lower than the DC bus voltage value required by the first starting circuit to start the control function in the main circuit, the second starting circuit can also provide control power for the main circuit to ensure the start of the control function in the main circuit. When the DC bus voltage is low, the main circuit can be started; and then the energy consumption of the main circuit is used to realize the release of electric energy on the DC bus when the inverter is shut down for maintenance, improving the safety of maintenance operations.

Description

technical field [0001] The invention belongs to the technical field of power electronics, and more specifically, relates to a switching power supply and a control method thereof. Background technique [0002] The capacitance capacity of the DC bus in the photovoltaic inverter system is relatively large. For a photovoltaic inverter with a large power such as 50kW+, the capacitance of the busbar is at the mF+ level, which will cause the busbar to discharge slowly when the photovoltaic inverter is turned off. , The discharge time is long, which is not conducive to shutdown maintenance. [0003] In order to solve the problem of long discharge time of the photovoltaic inverter bus capacitor, the existing technical solution is to increase the bus discharge circuit. Such as figure 1 As shown, when the bus voltage is high, that is, when the voltage difference between the capacitors BUS+ and BUS- is high, the control terminal V of the switch tube Q2 GS2 The voltage is higher than ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M1/32H02M7/48
CPCH02M1/32H02M7/48H02M1/322
Inventor 陈鹏王富李随军
Owner SUNGROW POWER SUPPLY CO LTD
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