Inverter current-limiting protection method and system
A current-limiting protection and inverter technology, which is applied in the field of inverter current-limiting protection methods and systems, can solve the problems of reducing the working stability of the inverter and damage to the inverter, so as to avoid excessive instantaneous impact current, Suppresses the effect of excessive output current
Active Publication Date: 2018-01-19
深圳市英威腾光伏科技有限公司
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[0004] The current inverter current limiting method mainly judges whether the inverter should limit the current by comparing whether the real-time output current value of the inverter exceeds the current limiting value. Under these working conditions, the inverter may not be able to normally enter the current limiting state, and the inverter is protected against overcurrent, thereby reducing the working stability of the inverter and causing the inverter to damage
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[0052] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. 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.
[0053] Please refer to the attached figure 1 , figure 1 It is a schematic flowchart of an inverter current limiting protection method provided by an embodiment of the present invention. Such as figure 1 As shown, the embodiment of the present invention discloses an inverter current limiting protection method, which is applied to the inverter circuit of the H6 bridge topology. The method specifically includes the following steps:
[0054] S101. Detect the in...
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The invention discloses an inverter current-limiting protection method and system, which are applied to an inverter circuit of an H6 bridge topology. The method comprises the steps of obtaining an inductive current instant detection value, a load current instant detection value and an inverter output voltage instant detection value; calculating an output capacitance current instant value and an inductive current change rate according to the inductive current instant detection value and the load current instant detection value; judging whether the inductive current instant detection value, theload current instant detection value, the inverter output voltage instant detection value, the output capacitance current instant value and the inductive current change rate meet preset conditions ornot, and if yes, outputting a current-limiting enable signal; controlling a high-frequency switch pipe in an inverter circuit to switch off according to the current-limiting enable signal. Through theinverter current-limiting protection method and system provided by the invention, the occurrence of the phenomenon that an output current of an inverter is overlarge under various working conditionsis effectively inhibited, and the inverter is prevented from stopping or being damaged caused by an overlarge instant impact current.
Description
technical field [0001] The invention relates to the technical field of inverter control, in particular to an inverter current limiting protection method and system. Background technique [0002] Inverter is a commonly used power conversion equipment in the field of electrical engineering. It is a device that uses power tube devices to convert DC power into AC power for use in AC loads. In recent years, with the rapid development of electronic power technology, inverter Power supplies are widely used in daily life, vehicle systems, post and telecommunications and other fields. [0003] The inverter is mainly composed of inverter bridge, control logic and filter circuit. When the load circuit is connected to the inverter circuit through the filter circuit, especially when the load circuit is a capacitive load, the output voltage will drop seriously in reverse. , it will cause the inverter circuit to generate a large surge current, which will cause the current to rise in a sho...
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Inventor 姜碧光姜亲宜
Owner 深圳市英威腾光伏科技有限公司