A mine frequency converter control power switching circuit based on dual power supply circuit

Abstract

The utility model discloses a mine frequency converter control electric switching circuit based on a dual power supply circuit. The switching circuit comprises: one end of an access end of a first power supply circuit is connected to a first power supply, the first access end is also connected to a first transformer, the first transformer is also connected to a first delay relay and a first contactor, the first delay relay is also connected to a coil of the first contactor, and the first contactor is also connected to a control electric circuit of the frequency converter; an access end of a second power supply circuit is connected to a second power supply, the second access end is also connected to a second transformer, the second transformer is also connected to a third contactor and a coil of the third contactor, the third contactor is also connected to the second contactor, the second contactor is also connected to the control electric circuit, and the coil of the second contactor is connected to the first transformer, so that automatic switching of dual power supplies is realized without using an external power supply and a battery, thereby reducing labor costs and improving the safety of electricity use of mining equipment.

Description

Technical Field

[0001] The utility model belongs to the technical field of mine frequency converters, and in particular relates to a mine frequency converter control power switching circuit based on a dual power supply circuit. Background Art

[0002] The environment in the mine is harsh, the power supply and distribution system is unstable, and the equipment in the mine has very high requirements for the reliability of power supply. In order to ensure the continuity and stability of power supply, many mining equipment use two power supply lines from different power supply stations in actual applications. Because the circuit system fluctuates greatly and the input voltage is unstable, the existing dual-power automatic switching switch requires additional power supply, and the manual switching switch needs to open the cover to operate. Coal mines have strict guidelines for equipment using batteries or capacitors, and there are strict discharge time requirements for opening the cover of the equipment. Therefore, the conventional switching switch cannot meet the use of various equipment in coal mines.

[0003] Therefore, how to quickly and accurately switch the power supply to ensure the continuity and reliability of the power supply to mining equipment is a technical problem to be solved by those skilled in the art. Utility Model Content

[0004] The purpose of the utility model is to solve the technical problem that the power supply switching of mining equipment in the prior art is not reliable enough. To this end, the utility model provides a mining inverter control power switching circuit based on a dual power supply circuit, and the switching circuit includes:

[0005] A first power supply circuit includes a first access terminal, a first transformer, a first time delay relay and a first contactor, wherein one end of the first access terminal is connected to a first power source, the other end of the first access terminal is connected to one end of a first transformer, the other end of the first transformer is respectively connected to one end of a first time delay relay and one end of a first contactor, the other end of the first time delay relay is connected to a coil of the first contactor, and the other end of the first contactor is connected to a control circuit of a frequency converter;

[0006] The second power supply circuit includes a second access terminal, a second transformer, a third contactor, and a second contactor, wherein one end of the second access terminal is connected to a second power supply, the other end of the second access terminal is connected to one end of the second transformer, the other end of the second transformer is respectively connected to one end of the third contactor and the coil of the third contactor, the other end of the third contactor is connected to one end of the second contactor, the other end of the second contactor is connected to the control electrical circuit, and the coil of the second contactor is connected to the other end of the first transformer.

[0007] Furthermore, the switching circuit also includes: the other end of the second contactor is also connected to the emergency power supply circuit of the main controller through a switching power supply and a capacitor in sequence.

[0008] Furthermore, the switching circuit also includes: the other end of the first access end is specifically connected to one end of the first transformer through a first surge protector and a first over-voltage and under-voltage protector in sequence.

[0009] Furthermore, the switching circuit also includes: the other end of the second access end is specifically connected to one end of the second transformer after passing through the second surge protector and the second over-voltage and under-voltage protector in sequence.

[0010] Furthermore, the other end of the first contactor and the other end of the second contactor are connected to the control circuit through a filter, a fuse and a leakage protection circuit in sequence.

[0011] Compared with the prior art, the beneficial effects of the utility model are:

[0012] The utility model provides a mine frequency converter control electric switching circuit based on a dual power supply circuit. Compared with the prior art, the switching circuit comprises a first power supply circuit, comprising a first access terminal, a first transformer, a first time delay relay and a first contactor, wherein one end of the first access terminal is connected to a first power source, the other end of the first access terminal is connected to one end of the first transformer, the other end of the first transformer is respectively connected to one end of the first time delay relay and one end of the first contactor, the other end of the first time delay relay is connected to the coil of the first contactor, and the other end of the first contactor is connected to the control electric circuit of the frequency converter; the second power supply circuit comprises a second access terminal, a second transformer, a third contactor and a second contactor, wherein one end of the second access terminal is connected to a second power source, the other end of the second access terminal is connected to one end of the second transformer, the other end of the second transformer is respectively connected to one end of the third contactor and the coil of the third contactor, the other end of the third contactor is connected to one end of the second contactor, the other end of the second contactor is connected to the control electric circuit, and the coil of the second contactor is connected to the other end of the first transformer, so that the automatic switching of the dual power sources is realized without using an external power source and a battery, thereby reducing the labor cost and improving the safety of power use of mining equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the embodiments of this specification, the drawings required for use in the embodiments will be briefly introduced below. The drawings described below are only some embodiments recorded in this specification. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0014] Figure 1 Shown is a schematic diagram of the structure of a mine frequency converter control power switching circuit based on a dual power supply circuit provided in an embodiment of this specification. DETAILED DESCRIPTION

[0015] In order to enable those skilled in the art to better understand the technical solutions in this specification, the technical solutions in the embodiments of this specification will be clearly and completely described below in conjunction with the drawings in the embodiments of this specification. Obviously, the described embodiments are only part of the embodiments of this specification, not all of the embodiments. Based on the embodiments in this specification, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of this specification.

[0016] like Figure 1 The structure diagram of the mine frequency converter control electric switching circuit based on the dual power supply circuit provided by the embodiment of this specification is shown. Although the present specification provides the structure shown in the following embodiment or the accompanying drawings, more or fewer structures after partial merging can be included in the structure based on routine or no creative labor, and these structures are not limited to the structures shown in the embodiments of this specification or the accompanying drawings. When the structure is applied in the actual device or terminal product, it can be executed sequentially or in parallel according to the embodiment or module structure.

[0017] The mine frequency converter control power switching circuit based on the dual power supply circuit provided in the embodiments of this specification can be applied in various mine environments. The circuit includes:

[0018] A first power supply circuit includes a first access terminal, a first transformer, a first time delay relay and a first contactor, wherein one end of the first access terminal is connected to a first power source, the other end of the first access terminal is connected to one end of a first transformer, the other end of the first transformer is respectively connected to one end of a first time delay relay and one end of a first contactor, the other end of the first time delay relay is connected to a coil of the first contactor, and the other end of the first contactor is connected to a control circuit of a frequency converter;

[0019] The second power supply circuit includes a second access terminal, a second transformer, a third contactor, and a second contactor, wherein one end of the second access terminal is connected to a second power supply, the other end of the second access terminal is connected to one end of the second transformer, the other end of the second transformer is respectively connected to one end of the third contactor and the coil of the third contactor, the other end of the third contactor is connected to one end of the second contactor, the other end of the second contactor is connected to the control electrical circuit, and the coil of the second contactor is connected to the other end of the first transformer.

[0020] Specifically, when the first power supply circuit has power, the first delay relay is energized, and the coil of the normally closed contactor, that is, the second contactor, is energized. Then the second contactor contact is disconnected, and the first contactor coil is energized after a delay of 1s, and the first contactor contact is connected. At this time, the second power supply circuit is not connected to the control power circuit regardless of whether it is energized or not, and does not affect the normal operation of the control power circuit. When there is a problem with the first power supply circuit and it needs to be switched to the second power supply circuit for power supply, the third contactor coil is energized at this time, and the third contactor contact is connected. At the same time, the second contactor coil is de-energized, and the second contactor contact is connected. The control power circuit still works normally, and the first power supply circuit of the ground pool is de-energized and disconnected from the control power circuit, which does not affect the normal operation of the control power circuit. At this time, the first power supply circuit is powered normally, the coil of the second contactor is energized, the second contactor contact is disconnected, and the second circuit is disconnected from the control circuit. At the same time, the first delay relay is energized, and the coil of the first contactor is energized with a delay. After the set delay time is reached, the first contactor is connected, and the control power circuit works normally again.

[0021] In an embodiment of the present application, the switching circuit further includes: the other end of the second contactor is also connected to the emergency power supply circuit of the main controller through a switching power supply and a capacitor in sequence.

[0022] In an embodiment of the present application, the switching circuit also includes: the other end of the first access end is specifically connected to one end of the first transformer through a first surge protector and a first over-voltage and under-voltage protector in sequence, the other end of the second access end is specifically connected to one end of the second transformer after passing through a second surge protector and a second over-voltage and under-voltage protector in sequence, and the other end of the first contactor and the other end of the second contactor are connected to the control electrical circuit after passing through a filter, a frequent power-off protector, a fuse, and a leakage protection circuit in sequence.

[0023] Specifically, the over-voltage and under-voltage protector can automatically disconnect when the incoming voltage is lower than or higher than the set voltage value, and automatically close when the voltage returns to normal, to prevent the components of the subsequent control circuit from working under abnormal voltage. The surge protector can be used when the incoming voltage is seriously overvoltage or the line is struck by lightning. The varistor of the overvoltage protector will be broken down and short-circuited, clamping the voltage at both ends at a lower level to prevent the components of the subsequent control circuit from being damaged by high voltage shocks. The filter can filter out the input side voltage noise and reduce the power supply side harmonics, so that the components of the subsequent control circuit are not interfered by noise. The fuse can disconnect the circuit when the subsequent circuit is short-circuited or exceeds the rated current value, and is used to protect the subsequent circuit. The leakage protection circuit can prevent the leakage current of the control circuit from causing the main circuit protection when the working voltage level of the coal mine equipment is high and the working voltage of the control circuit is low. The control circuit leakage protector is used to protect the subsequent circuit.

[0024] It should be understood that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or there may be an intervening element at the same time; when an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element at the same time. In addition, the "connection" used here may include wireless connection; the term "and / or" used includes any unit and all combinations of one or more associated listed items.

[0025] Those skilled in the art will appreciate that all or part of the steps in the above-mentioned embodiment method can be completed by instructing related hardware through a program.

[0026] In addition, each functional unit in each embodiment of the present application may be integrated into a processing module, or each unit may exist physically separately, or two or more units may be integrated into one module. The above-mentioned integrated module may be implemented in the form of hardware or in the form of a software functional module. If the integrated module is implemented in the form of a software functional module and sold or used as an independent product, it may also be stored in a computer-readable storage medium.

[0027] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0028] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

[0029] The above contents are further detailed descriptions of the present invention in combination with specific preferred implementations, and the specific implementation of the present invention cannot be considered to be limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as falling within the protection scope of the present invention.

Claims

1. A mine frequency converter control power switching circuit based on a dual power supply circuit, characterized in that: The switching circuit comprises: A first power supply circuit includes a first access terminal, a first transformer, a first time delay relay and a first contactor, wherein one end of the first access terminal is connected to a first power source, the other end of the first access terminal is connected to one end of a first transformer, the other end of the first transformer is respectively connected to one end of a first time delay relay and one end of a first contactor, the other end of the first time delay relay is connected to a coil of the first contactor, and the other end of the first contactor is connected to a control circuit of a frequency converter; The second power supply circuit includes a second access terminal, a second transformer, a third contactor, and a second contactor, wherein one end of the second access terminal is connected to a second power supply, the other end of the second access terminal is connected to one end of the second transformer, the other end of the second transformer is respectively connected to one end of the third contactor and the coil of the third contactor, the other end of the third contactor is connected to one end of the second contactor, the other end of the second contactor is connected to the control electrical circuit, and the coil of the second contactor is connected to the other end of the first transformer.

2. The mine frequency converter control power switching circuit based on dual power supply circuit according to claim 1, characterized in that: The switching circuit also includes: the other end of the second contactor is also connected to the emergency power supply circuit of the main controller through a switching power supply and a capacitor in sequence.

3. The mine frequency converter control power switching circuit based on dual power supply circuit according to claim 1, characterized in that: The switching circuit also includes: the other end of the first access end is connected to one end of the first transformer through a first surge protector and a first over-voltage and under-voltage protector in sequence.

4. The mine frequency converter control power switching circuit based on dual power supply circuit according to claim 1, characterized in that: The switching circuit also includes: the other end of the second access end is connected to one end of the second transformer after passing through the second surge protector and the second over-voltage and under-voltage protector in sequence.

5. The mine frequency converter control power switching circuit based on dual power supply circuit according to claim 1, characterized in that: The other end of the first contactor and the other end of the second contactor are connected to the control circuit through a filter, a fuse and a leakage protection circuit in sequence.

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