阅读说明：本技术 一种电压变换器及其浪涌电流限制装置 (Voltage converter and surge current limiting device thereof ) 是由 魏连友 于 2019-09-05 设计创作，主要内容包括：本发明公开了一种浪涌电流限制装置,由于可控开关在刚开始导通时处于高阻抗的状态,可以有效地限制回路中的浪涌电流,且由于可控开关可以在处理器的控制下以预设速率均匀地打开至完全导通状态,在此过程中可控开关的阻抗会逐渐减小最后接近与零,不至于因为阻抗的突变而导致电压跃变从而再次产生浪涌电流,本发明有效地限制了电压变换器中的浪涌电流,保护了相关器件。本发明还公开了一种电压变换器,具有如上浪涌电流限制装置相同的有益效果。(The invention discloses a surge current limiting device, which can effectively limit surge current in a loop because a controllable switch is in a high-impedance state when the controllable switch is just switched on, and can be uniformly switched on to a complete-switching-on state at a preset speed under the control of a processor, the impedance of the controllable switch can be gradually reduced and finally approaches zero in the process, so that the surge current can not be generated again because of voltage jump caused by sudden change of the impedance. The invention also discloses a voltage converter which has the same beneficial effects as the surge current limiting device.)

1. An inrush current limiting device applied to a voltage converter, comprising:

the first end of the controllable switch is used for being connected with a filter capacitor of the voltage converter, and the second end of the controllable switch is used for being connected with a power supply of the voltage converter;

and the processor is connected with the control end of the controllable switch and used for controlling the controllable switch to be turned on when the power supply is powered on and uniformly turning on the controllable switch to be in a complete conducting state at a preset speed.

2. The inrush current limiting device of claim 1, further comprising:

and the human-computer interaction device is connected with the processor and is used for actively controlling the conduction state of the controllable switch by a user.

3. The inrush current limiting device of claim 2, wherein the human machine interface device is a Human Machine Interface (HMI).

4. The inrush current limiting device of claim 1, wherein the preset rate is from starting to turn on uniformly to fully conducting within 200 ms.

5. The inrush current limiting device of claim 1, wherein the controllable switch is a transistor, and a base of the transistor serves as a control terminal of the controllable switch.

6. The inrush current limiting device of claim 1, wherein the processor is a Micro Control Unit (MCU).

7. The inrush current limiting device of any of claims 1 to 6, wherein the power supply of the processor is a power supply of the voltage converter;

the processor is specifically configured to control the controllable switch to start conducting when the processor is powered on, and to uniformly open to a fully conducting state at a preset rate.

8. A voltage converter, characterized in that it comprises an inrush current limiting device as claimed in any one of claims 1 to 8.

Technical Field

The invention relates to the technical field of electric power, in particular to an inrush current limiting device and a voltage converter.

Background

At the voltage converter start-up in the twinkling of an eye, need at first charge to the inside filter capacitor of self, can produce a very big surge current, surge current can seriously pollute the power supply network, cause the damage to other components and parts in the circuit even, can concatenate a resistance on filter capacitor's power supply line usually among the prior art, still can connect a switch in parallel at this resistance both ends simultaneously, when the power was just gone up, the switch is in the off-state, the resistance can be used to the partial pressure in order to reduce surge current, need be closed with the switch in order to improve power supply efficiency when the electric capacity is full of electricity, but the distributed voltage of resistance can be applyed on the electric capacity in the twinkling of an eye thereby surge once more produces a higher surge current, still can damage relevant device, the current restriction effect is.

Therefore, how to provide a solution to the above technical problem is a problem that needs to be solved by those skilled in the art.

Disclosure of Invention

The invention aims to provide an inrush current limiting device, which effectively limits the inrush current in a voltage converter and protects related devices; another object of the present invention is to provide a voltage converter including the above surge current limiting device, which effectively limits the surge current in the voltage converter and protects the related devices.

In order to solve the above technical problem, the present invention provides an inrush current limiting device applied to a voltage converter, including:

the first end of the controllable switch is used for being connected with a filter capacitor of the voltage converter, and the second end of the controllable switch is used for being connected with a power supply of the voltage converter;

and the processor is connected with the control end of the controllable switch and used for controlling the controllable switch to be turned on when the power supply is powered on and uniformly turning on the controllable switch to be in a complete conducting state at a preset speed.

Preferably, the inrush current limiting device further includes:

and the human-computer interaction device is connected with the processor and is used for actively controlling the conduction state of the controllable switch by a user.

Preferably, the human-computer interaction device is a human-computer interface HMI.

Preferably, the preset rate is from start conduction to full conduction evenly within 200 ms.

Preferably, the controllable switch is a triode, and a base of the triode is used as a control end of the controllable switch.

Preferably, the processor is a Micro Control Unit (MCU).

Preferably, the power supply of the processor is the power supply of the voltage converter;

the processor is specifically configured to control the controllable switch to start conducting when the processor is powered on, and to uniformly open to a fully conducting state at a preset rate.

In order to solve the technical problem, the invention further provides a voltage converter comprising the inrush current limiting device.

The invention provides a surge current limiting device, which can effectively limit surge current in a loop because a controllable switch is in a high-impedance state when the controllable switch is just switched on, and can be uniformly switched on to a complete-switching-on state at a preset speed under the control of a processor, the impedance of the controllable switch can be gradually reduced and finally approaches zero in the process, so that the surge current can not be generated again due to voltage jump caused by sudden change of the impedance.

The invention also provides a voltage converter which has the same beneficial effects as the surge current limiting device.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed in the prior art and the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

Fig. 1 is a schematic structural diagram of an inrush current limiting device according to the present invention;

fig. 2 is a schematic structural diagram of another inrush current limiting device provided by the present invention.

Detailed Description

The core of the invention is to provide a surge current limiting device, which effectively limits the surge current in a voltage converter and protects related devices; another core of the present invention is to provide a voltage converter including the above surge current limiting device, which effectively limits the surge current in the voltage converter and protects the related devices.

In order to make the objects, 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 with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1, fig. 1 is a schematic structural diagram of an inrush current limiting device provided in the present invention, including:

the controllable switch 1 is used for connecting a first end with a filter capacitor of the voltage converter and connecting a second end with a power supply of the voltage converter;

and the processor 2 is connected with the control end of the controllable switch 1 and is used for controlling the controllable switch 1 to be turned on when the power supply is powered on and uniformly turning on the controllable switch 1 to be in a complete conducting state at a preset speed rate.

Specifically, the first end and the second end of the controllable switch 1 may be connected in series to any position in the filter capacitor power supply loop, and the controllable switch 1 is connected to present different impedance states and divide voltages with different magnitudes through a change in a conduction state, so as to better limit the surge current.

Wherein, when the power supply is powered on, a larger surge current can be generated, so that the processor 2 can control the controllable switch 1 to start to conduct on the power supply, at the moment, the controllable switch 1 presents a larger impedance due to being in a micro-conducting state, and can share a larger voltage, so that the magnitude of the surge current generated in the loop is effectively limited, the processor 2 can control the controllable switch 1 to be uniformly opened to a complete conducting state at a preset speed, in the process, the change of the conducting state of the controllable switch 1 is slower, compared with the prior art that the fixed value resistor is directly connected in/short-circuited through the on-off of the switch, so that the impedance presented by the controllable switch 1 is slowly reduced from large to small, under the condition, the part of the large voltage shared by the controllable switch 1 when the controllable switch is firstly conducted can not be directly added at two ends of the filter capacitor, the secondary surge current can not be generated as in the prior art, related devices in the circuit are well protected from being damaged, and the maintenance and replacement cost is saved.

The invention provides a surge current limiting device, which can effectively limit surge current in a loop because a controllable switch is in a high-impedance state when the controllable switch is just switched on, and can be uniformly switched on to a complete-switching-on state at a preset speed under the control of a processor, the impedance of the controllable switch can be gradually reduced and finally approaches zero in the process, so that the surge current can not be generated again due to voltage jump caused by sudden change of the impedance.

For better explaining the embodiment of the present invention, please refer to fig. 2, fig. 2 is a schematic structural diagram of another inrush current limiting device provided by the present invention, and on the basis of the above embodiment:

as a preferred embodiment, the inrush current limiting device further comprises:

a human-computer interaction device 3 connected to the processor 2 for a user to actively control the on-state of the controllable switch 1 through the human-computer interaction device.

Specifically, considering that in some cases, the program in the processor 2 for controlling the controllable switch 1 is disordered, the conducting state of the controllable switch 1 cannot be automatically controlled, or a worker has a requirement for actively controlling the controllable switch 1, in such a case, the user can actively control the conducting state of the controllable switch 1 through the processor 2 through the human-computer interaction device 3, including actively controlling the time for starting conducting and the conducting rate of the controllable switch 1, and the like, the embodiment of the present invention is not limited herein.

As a preferred embodiment, the Human Machine Interface device 3 is an HMI (Human Machine Interface).

Specifically, the HMI has advantages of small volume, low price, convenient operation, and the like.

Of course, the human-computer interaction device 3 may be of various types other than the HMI, and the embodiment of the present invention is not limited thereto.

As a preferred embodiment, the preset rate is from start conduction open evenly to full conduction within 200 ms.

Specifically, the impedance state change rate of the controllable switch 1 can be ensured to be small in 200ms, and in this case, because the impedance change rate is small, the jump voltage in the loop cannot be large, the surge current can not occur again, and the reliability is good.

Of course, the preset rate may be in other specific cases besides being uniformly turned on from the initial conduction to the complete conduction within 200ms, and the embodiment of the present invention is not limited herein.

In a preferred embodiment, the controllable switch 1 is a triode, and the base of the triode is used as the control terminal of the controllable switch 1.

Specifically, the triode has the advantages of small volume, low price, long service life and the like.

Of course, the controllable switch 1 may be of other types besides a triode, such as a MOS (Metal Oxide Semiconductor, Metal-Oxide Semiconductor field effect transistor) transistor, and the embodiment of the present invention is not limited herein.

As a preferred embodiment, the processor 2 is a micro control unit MCU.

Specifically, an MCU (Microcontroller Unit) has advantages of small size, low price, and fast processing speed.

Of course, the processor 2 may be of various types other than the MCU, and the embodiment of the present invention is not limited herein.

As a preferred embodiment, the power supply of the processor 2 is the power supply of a voltage converter;

the processor 2 is specifically configured to control the controllable switch 1 to start conducting when it is powered on, and to open to a fully conducting state uniformly at a preset rate.

Specifically, the processor 2 may use the power source of the voltage converter as its own power source, so that when the power source of the voltage converter is powered on, the processor 2 is powered on at the same time, which is equivalent to that at the moment when the processor 2 is powered on (which is equivalent to that when the voltage converter is powered on), the controllable switch 1 may start to be controlled to be uniformly turned on to a fully-conducting state at a preset rate, and an additional device for detecting the power on of the voltage converter is not required, thereby saving the cost.

Of course, the power supply of the processor 2 may also be an independent power supply, in this case, an additional device for detecting the power-on of the voltage converter needs to be provided, or a worker triggers a switch to notify the processor 2 that the voltage converter starts to power on, which is not limited herein.

The invention also provides a voltage converter comprising an inrush current limiting device as in any one of the above.

For describing the voltage converter provided by the embodiment of the present invention, please refer to the embodiment of the inrush current limiting device in the foregoing embodiment, and the embodiment of the present invention is not limited herein.

The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. It is further noted that, in the present specification, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.