Direct-current bus over-current protection circuit and bidirectional converter
An overcurrent protection circuit, DC bus technology, applied in emergency protection circuit devices, circuit devices, emergency protection devices with automatic disconnection, etc. Fast and effective effect of separation and detection methods
Pending Publication Date: 2021-08-06
DELTA ELECTRONICS (SHANGHAI) CO LTD
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Problems solved by technology
[0005] The purpose of the present disclosure is to provide a DC bus overcurrent protection circuit and a bidirectional converter capable of fast overcurrent detection and circuit protection, which are used to overcome the limitations and defects of related technologies at least to a certain extent. It is easy to damage components and reduce the service life of devices when performing circuit overcurrent detection and protection
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[0048] Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete and will fully convey the concept of example embodiments to those skilled in the art. The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided in order to give a thorough understanding of embodiments of the present disclosure. However, those skilled in the art will appreciate that the technical solutions of the present disclosure may be practiced without one or more of the specific details being omitted, or other methods, components, devices, steps, etc. may be adopted. In other instances, well-known technical solution...
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The invention provides a direct-current bus over-current protection circuit. The circuit is coupled to a direct current bus between a first direct current end and a second direct current end, wherein the direct current bus comprises a positive bus and a negative bus. The direct current bus over-current protection circuit comprises a main protection branch, a freewheeling switch branch, a detection unit and a control unit; the main protection branch is connected to the positive bus or the negative bus in series and comprises a first protection switch and a second protection switch which are connected to a first node in series; one end of the freewheeling switch branch is connected to the positive bus, the other end of the freewheeling switch branch is connected to the negative bus, and one of the two ends of freewheeling switch branch is coupled to the first node; the detection unit is coupled to the direct current bus and is used for sampling and judging voltage or current on the direct current bus in real time so as to output an overcurrent detection signal; and the control unit is used for controlling the main protection branch to perform switching action according to the overcurrent detection signal provided by the detection unit. According to the direct-current bus over-current protection circuit and bidirectional converter of the embodiment of the invention, the over-current protection efficiency and reliability can be improved, and the element loss is reduced.
Description
technical field [0001] The present disclosure relates to the technical field of power circuits, in particular, to a DC bus overcurrent protection circuit and a bidirectional converter. Background technique [0002] In many applications such as DC power supplies and inverters, faults such as short circuits may occur at their DC input ports or output ports, internal circuits or external loads. The abnormal current and energy are cut from the system. [0003] Fast fuse is a widely used overcurrent and short circuit protection method, but the fault clearing current of this method is usually dozens of times larger than the rated current of the circuit when realizing fast protection, which is easy to damage sensitive components. For overloads of several times the rated current, the protection time of the fuse is often several seconds or even more than tens of seconds, and it is easy to cause heat damage to some lines or devices. [0004] It should be noted that the information d...
Claims
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IPC IPC(8): H02H3/087H02H1/00H02H7/26
CPCH02H3/087H02H1/0007H02H7/268H02H7/10
Inventor 沈国桥章进法周玉虎
Owner DELTA ELECTRONICS (SHANGHAI) CO LTD