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A breaking device and inverter system

A breaking device and breaking unit technology, applied in the direction of automatic disconnection emergency protection device, circuit device, emergency protection circuit device, etc., can solve the problem of shortening the service life of the fuse, affecting the reliability of the breaking device, and low reliability of the breaking device question

Active Publication Date: 2021-06-22
HUAWEI DIGITAL POWER TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] but, figure 1 The breaking device shown has the following problems in practical application: during normal operation, the output current of the photovoltaic string is shunted according to the internal resistance ratio of the relay and the fuse, so a considerable part of the current flows through the fuse, causing the fuse to heat up. , which shortens the service life of the fuse, which in turn affects the reliability of the breaking device
[0007] In summary, in the solutions provided in the prior art, there is a problem of low reliability of the breaking device

Method used

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Examples

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example 1

[0096] see Figure 6 , is a breaking device provided in the embodiment of this application. The breaking device is connected in series between the DC input terminal and the protected circuit. When the protected circuit fails, the breaking device disconnects the electrical connection between the DC input terminal and the protected circuit.

[0097] Figure 6 The breaking device shown includes a fuse, a current limiting resistor, a relay, and a controller. Among them, the fuse and the current-limiting resistor are connected in parallel with the relay after being connected in series; the controller is used to control the pull-in or disconnection of the relay.

[0098] Figure 6 The working principle of the breaking device shown is as follows: during normal operation, the controller controls the relay to pull in, and the current is shunted through the two branches of the series branch of the fuse and the current limiting resistor and the relay branch. The impedance of the resi...

example 2

[0107] see Figure 7 , is a breaking device provided in the embodiment of this application. The breaking device is connected in series between the DC input terminal and the protected circuit. When the protected circuit fails, the breaking device disconnects the electrical connection between the DC input terminal and the protected circuit.

[0108] Figure 7 The breaking device shown includes fuses, diodes, relays and controls. Among them, after the fuse and the diode are connected in series, they are connected in parallel with the relay; the controller is used to control the pull-in or disconnection of the relay.

[0109] Figure 7The working principle of the breaking device shown is as follows: during normal operation, the controller controls the relay to pull in, and the current is shunted through the two branches of the series branch of the fuse and the diode and the branch of the relay. The conduction voltage drop acts on the relay branch. At this time, most of the cur...

example 3

[0118] see Figure 8 , is a breaking device provided in the embodiment of this application. The breaking device is connected in series between the DC input terminal and the protected circuit. When the protected circuit fails, the breaking device disconnects the electrical connection between the DC input terminal and the protected circuit.

[0119] Figure 8 The breaking device shown includes a fuse, an oxide film removal circuit, a first relay, a controller, and a first current limiting resistor. The oxide film removal circuit is composed of a second relay and a second current limiting resistor connected in parallel, and the second relay is a normally closed relay. Wherein, the fuse, the first current limiting resistor, and the oxide film removal circuit are connected in parallel with the first relay after being connected in series; the controller is used to control the first relay to be turned on or off, and the second relay to be turned on or off.

[0120] Wherein, the de...

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Abstract

The embodiment of the present application discloses a breaking device and an inverter system, which are used to cut off the electrical connection when the protected circuit fails. The breaking device is connected in series in the protected circuit, and is used to cut off the electrical connection when the protected circuit fails; The automatic breaking unit is used to automatically disconnect when the flowing current exceeds the breaking current threshold, the first current limiting unit is used to limit the current on the first branch; the second branch connected in parallel with the first branch includes The first controllable switch unit, the control end of which is connected to the controller, is used to disconnect or pull in under the control of the controller; the controller is connected to the control end of the first controllable switch unit and the protected circuit, It is used to control the first controllable switch unit to turn on when the protected circuit is working normally, and to control the first controllable switch unit to turn off when the protected circuit fails.

Description

[0001] This application claims the priority of the Chinese patent application with the application number 201910157622.8 and the application title "A Disconnecting Device and Inverter System" submitted to the China Patent Office on March 1, 2019, the entire contents of which are incorporated herein by reference Applying. technical field [0002] The present application relates to the technical field of power electronics, in particular to a breaking device and an inverter system. Background technique [0003] At present, large-scale photovoltaic power plants are generally connected to inverters in series through photovoltaic modules, and the inverter converts the direct current output from photovoltaic modules into alternating current, and then transmits it to the grid. Among them, the DC voltage output by the photovoltaic module is as high as hundreds of volts or even thousands of volts. When a fault occurs inside the inverter, if the photovoltaic module continues to inject...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/12H02H7/122H02H9/02
CPCH02H7/122H02H7/1213H02H9/02H02H7/1225H02H3/08H02H3/06Y02E10/56H02H1/0007
Inventor 王勋曹震高拥兵
Owner HUAWEI DIGITAL POWER TECH CO LTD
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