A short-circuit protection device to ground and an inverter system

A protection device and short-to-ground technology, applied in emergency protection circuit devices, electrical components, etc., can solve the problems of inability to reduce the risk of fire, protect the inverter, and long response time, so as to reduce the risk of fire and protect the inverter. , the effect of fast response time

Pending Publication Date: 2019-01-04
ZHEJIANG HECHUAN TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in this way, the response time of the protection is too long due to the need to wait for the fuse to blow, and the power module of the inverter will cause damage to the inverter due to heat after more than 10us. It can be seen that the existing short-circuit protection method to ground cannot Effectively protect the inverter, but also cannot reduce the risk of fire

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  • A short-circuit protection device to ground and an inverter system
  • A short-circuit protection device to ground and an inverter system

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Embodiment Construction

[0032] The core of this application is to provide a short-circuit protection device to ground, which can effectively protect the inverter and reduce the risk of fire; another core of the application is to provide an inverter system, which is compatible with the above-mentioned The short circuit protection device has the same beneficial effect.

[0033] In order to make the purposes, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments It is a part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of this application.

[003...

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Abstract

The invention discloses a short-circuit protection device to ground and an inverter system, comprising an isolation operational amplifier, a sampling module, a controller and a power module; The output end of the sampling module is connected with the input end of the isolation operational amplifier, the output end of the isolation operational amplifier is connected with the controller, and the isolation operational amplifier is connected with the power supply module. The sampling module is used for collecting the voltage of the inverter circuit and obtaining the sampling voltage; An isolationoperational amplifier is used for amplifying the sampling voltage to obtain an operational amplifier voltage; The controller is used to control the inverter circuit to open when the operational amplifier voltage is greater than a preset threshold value. When the inverter circuit is monitored, the voltage of the inverter circuit is collected in real time to obtain a sampled voltage, and the sampledvoltage is amplified and output to a controller. When the controller determines that a short circuit to ground occurs, the inverter circuit is controlled to be disconnected to protect the inverter. Due to the fast response of the controller, the protection action can be completed within 3us, which can effectively protect the inverter and reduce the fire risk.

Description

technical field [0001] The present application relates to the technical field of electrical automation, in particular to a short-circuit protection device to ground and an inverter system. Background technique [0002] With the development of technology, inverters have been widely used in many fields. During the use of the inverter, due to the aging or damage of components, high temperature and wrong wiring, etc., short-circuit to ground will occur. If there is no short-circuit protection device to ground, the inverter will be damaged or even cause a fire. Therefore, short-circuit to ground Protective gear is very important. [0003] At present, the common ground short-circuit protection method is to connect a fuse at the input front end of the inverter circuit. When the ground short circuit occurs, the fuse will blow, and then cut off the inverter circuit to ensure that no major safety accidents occur. However, in this way, the response time of the protection is too long ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/122
CPCH02H7/122
Inventor 谢周悦
Owner ZHEJIANG HECHUAN TECH
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