CN220475599U - Power input control circuit and multistage variable frequency cabinet - Google Patents

Abstract

The utility model discloses a power input control circuit and a multi-section variable frequency cabinet, wherein the power input control circuit comprises: a plurality of power input terminals for accessing an input power; the power supply output ends are used for being connected with the power supply processing circuit; and each switching device is used for controlling the corresponding power input end to be electrically connected with the power output end when being closed so as to form a power input branch. The utility model can realize independent work of each section of variable frequency cabinet in the multi-section variable frequency cabinet, and can switch the input power supply of the multi-section variable frequency cabinet according to different application requirements.

Description

Power input control circuit and multistage variable frequency cabinet

Technical Field

The utility model relates to the technical field of frequency converters, in particular to a power input control circuit and a multi-section frequency conversion cabinet.

Background

Along with the high-speed development of economy, the market is increasingly rising in the hope of saving energy for products, and the market demand of the frequency converter is greatly stimulated. Meanwhile, more and more clients have higher requirements on the safety, the operation convenience, the state display intuitiveness and the maintainability of the cabinet-type frequency converter. When a multi-section cabinet frequency converter is needed, the maintainability is more and more important to the applicability of the power supply, and more importance is attached to the electric designer. Most cabinet frequency converters in the current market use single power supply, and most multistage cabinets need to start simultaneously to stop, and when one of them cupboard breaks down in multistage frequency conversion cabinet, need stop whole multistage frequency conversion cabinet and maintain, influence work efficiency to, when needs use different power supplies, can not rationally use the power.

Disclosure of Invention

The utility model mainly aims to provide a power input control circuit which aims to solve the problem that when one of the multi-section variable frequency cabinets fails, the whole multi-section variable frequency cabinet needs to be stopped for maintenance, and the working efficiency is affected; and when different power supplies are needed, the multi-section variable frequency cabinet cannot be reasonably applied to the power supplies.

In order to achieve the above object, the present utility model provides a power input control circuit applied to a multi-stage variable frequency cabinet, wherein the multi-stage variable frequency cabinet includes a plurality of power processing circuits, the power input control circuit includes:

a plurality of power input terminals for accessing an input power;

the power supply output ends are used for being connected with the power supply processing circuit;

and each switching device is used for controlling the corresponding power input end to be electrically connected with the power output end when being closed so as to form a power input branch.

Optionally, the power input control circuit further includes:

the switch control circuit is electrically connected with the plurality of switching devices respectively and is used for controlling the corresponding switching devices to be closed when being triggered by a user and controlling the corresponding power input ends to be electrically connected with the power output ends so as to form one or more paths of power input branches.

Optionally, the feedback end of each switching device is further connected to the receiving end of the switch control circuit, and the switching device is further configured to output a switch feedback signal to the switch control circuit when closed.

Optionally, the power input control circuit further includes:

and the interlocking control circuit is electrically connected with the switch control circuit and the plurality of switch devices respectively and is used for controlling the plurality of switch devices to interlock when being triggered by a user.

Optionally, the power input control circuit further includes:

the emergency stop control circuit is respectively and electrically connected with the switching devices, and is used for controlling each switching device to be turned off when the emergency stop control circuit is triggered by a user so as to disconnect the electrical connection between each power input end and each power output end.

The utility model also provides a multi-section variable frequency cabinet, which comprises:

a power input control circuit as described above;

the input ends of the power supply processing circuits are connected with the power supply output ends of the power supply input control circuits.

Optionally, each of the power supply processing circuits includes:

the input end of the rectifying unit is connected with the power output end of the power input control circuit, and the rectifying unit is used for rectifying the power output by the power input control circuit and outputting the power;

the input end of the inversion unit is connected with the output end of the rectification unit, and the inversion unit is used for converting the direct current power supply output by the rectification unit into an alternating current power supply and then outputting the alternating current power supply.

Optionally, the multi-section variable frequency cabinet further comprises:

the output switch circuit is arranged between the input ends of the two inversion units in series, and is used for controlling the input end of one inversion unit to be electrically connected with the input end of the other inversion unit when being conducted.

Optionally, the number of the power supply processing circuits is two;

the multistage variable frequency cabinet still includes:

the control unit is respectively and electrically connected with the power input control circuit and the output switch circuit, and is used for controlling one switch device in the power input control circuit to be conducted and controlling the output switch circuit to be conducted when receiving a first mode signal;

the control unit is also used for controlling one switching device in the power input control circuit to be turned on and controlling the output switching circuit to be turned off when receiving a second mode signal;

the control unit is also used for controlling the two switching devices in the power input control circuit to be conducted and controlling the output switching circuit to be conducted when receiving a third mode signal; the method comprises the steps of,

the control unit is also used for controlling the two switching devices in the power input control circuit to be conducted and controlling the output switching circuit to be turned off when receiving a fourth mode signal.

Optionally, the multi-section variable frequency cabinet further comprises:

connect the copper bar soon, connect the copper bar soon and dismantle and connect between two the input of contravariant unit, connect the copper bar soon and be used for realizing two the electricity is connected between the input of contravariant unit.

According to the utility model, the multiple power supply input ends and the switch devices are arranged, so that the multiple-stage variable frequency cabinet can be connected with multiple input power supplies, and the input power supplies can be switched according to different application requirements, or different power supplies are used for supplying power simultaneously, so that different application requirements of users are met, and the practicability of the multiple-stage variable frequency cabinet is improved. According to the utility model, the plurality of switching devices are arranged to enable the multi-section frequency conversion cabinets to work independently, when one section of frequency conversion cabinet fails, the corresponding switching device can be controlled to be turned off, so that the corresponding power input is cut off, meanwhile, other frequency conversion cabinets can continue to work, the whole multi-section frequency conversion cabinet does not need to stop working for maintenance, and the working efficiency of the multi-section frequency conversion cabinet is ensured.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of functional modules of an embodiment of a multi-stage variable frequency cabinet of the present utility model;

FIG. 2 is a schematic diagram of functional modules of another embodiment of the multi-stage variable frequency cabinet of the present utility model;

FIG. 3 is a schematic circuit diagram of an embodiment of a power input control circuit according to the present utility model;

fig. 4 is a schematic circuit diagram of another embodiment of the power input control circuit of the present utility model.

Reference numerals illustrate:

reference numerals	Name of the name	Reference numerals	Name of the name
				QF1、QF11	Switching device	X1～X23	Power supply input
KA8	Relay device	SB1～SB6	LED lamp
				SA3	Knob switch	FEEDBACK	Feedback end
KT1、KT2、KA1、KA4	Switch tube

The achievement of the objects, functional features and advantages of the present utility model will be further described with reference to the accompanying drawings, in conjunction with the embodiments.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

It should be noted that, if directional indications (such as up, down, left, right, front, and rear … …) are included in the embodiments of the present utility model, the directional indications are merely used to explain the relative positional relationship, movement conditions, etc. between the components in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indications are correspondingly changed.

In addition, if there is a description of "first", "second", etc. in the embodiments of the present utility model, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present utility model.

In a multi-stage variable frequency cabinet, a plurality of rectification units are generally provided, each rectification unit rectifies an input alternating current power supply and then sends the rectified power supply to an inversion unit through a direct current bus, and the inversion unit inverts direct current and outputs the inverted direct current to electric equipment such as a motor, a pump and the like, wherein each rectification unit, the direct current bus and the inversion unit can be regarded as a section of variable frequency cabinet. In the current multistage variable frequency cabinet, a plurality of rectification units access the same power, multistage variable frequency cabinet need open simultaneously and stop, when one of them section cupboard breaks down in multistage variable frequency cabinet, need stop whole multistage variable frequency cabinet and maintain, influence work efficiency to, when needs use different power, can not be to the rational utilization of power.

In order to solve the above-mentioned problems, the present utility model provides a power input control circuit applied to a multi-stage variable frequency cabinet, the multi-stage variable frequency cabinet includes a plurality of power processing circuits, referring to fig. 1 to 4, in an embodiment, the power input control circuit includes:

a plurality of power input terminals for accessing an input power;

the power supply output ends are used for being connected with the power supply processing circuit;

and each switching device is used for controlling the corresponding power input end to be electrically connected with the power output end when being closed so as to form a power input branch.

In this embodiment, the power input control circuit has a plurality of power input terminals for accessing an input power, and it can be understood that the plurality of power input terminals may access the same input power or access different input power according to actual application requirements, for example, one power input terminal may access a power grid, another power input terminal may also access the power grid, or access other input power devices such as a photovoltaic device, a generator, and the like. So set up for multistage frequency conversion cabinet can insert different input power, can carry out input power's switching according to the application demand, perhaps uses different power to supply power simultaneously, in order to satisfy user's different application demand.

The switching devices can be realized by selecting switching devices such as a high-voltage alternating-current contactor and a circuit breaker according to practical application requirements, and each switching device is arranged between a power input end and a power output end in series and used for controlling the on or off of a passage between an input power and a power processing circuit. So set up, one section frequency conversion cabinet inserts an input power through switching device, can independently work, does not interfere with other frequency conversion cabinets, when arbitrary one section frequency conversion cabinet trouble, can control the switching device that corresponds and turn off to cut off corresponding power input, and control other switching device and keep on, make other frequency conversion cabinets can continue to work, need not to stop work with maintaining whole multistage frequency conversion cabinet, guaranteed the work efficiency of multistage frequency conversion cabinet. In addition, can also set up interlock circuit between a plurality of switching devices for when the user triggers interlock circuit, realize the interlock between a plurality of switching devices of control, when arbitrary switch closure switches on promptly, other switching devices can't close and switch on, so, can prevent that the maloperation from leading to other frequency conversion cabinets to start when only needing one of them section frequency conversion cabinet work, improved the security of multistage frequency conversion cabinet.

The following two power input ends, switching devices and power output ends are described by taking an example, referring to fig. 2, fig. 2 is a schematic diagram of functional modules of an embodiment of a multi-section variable frequency cabinet, where each power processing circuit includes a rectifying unit and an inverting unit, and a user can control the corresponding rectifying unit to work by controlling the corresponding switching devices to be turned on or off, and can also control the corresponding inverting unit to work by accessing copper bars. For example, when the variable frequency cabinet is required to provide two paths of different power supplies for two electric equipment, the power supply input end 1 and the power supply input end 2 can be connected into different input power supplies, the switching devices QF1 and QF11 are controlled to be both conducted, the quick-connection copper bars are unloaded, two independent power supply branches are formed at the moment, and the power supplies output by the two power supply branches are different, so that the power supply requirements of the two electric equipment are met. When the variable frequency cabinet is required to provide two paths of same power supplies for two electric equipment, the input power supply can be connected to the power supply input end 1, the control switch device QF1 is conducted and the quick-connection copper bar is installed, so that the rectifying unit 1 outputs the same power supply to the two electric equipment through the inverting units 1 and 2. Alternatively, the power input terminal 1 and the power input terminal 2 can be connected with two input power sources with the same voltage and frequency, and the switching devices QF1 and QF11 are controlled to be conducted, so that whether the quick-connection copper bars are installed or not can obtain two paths of power output. When only one path of power supply is needed to be provided for one electric equipment by the variable frequency cabinet, the input power supply is accessed to any one power supply input end, and the corresponding switching device is controlled to be conducted, so that one path of power supply output can be obtained. When the rectifying unit 1 fails and the electric equipment connected with the inverting unit 1 needs to be powered, the power input end 2 can be connected with an input power supply, the control switch device QF11 is connected and is provided with a quick-connection copper bar, and meanwhile the inverting unit 2 is controlled to stop working, the inverting unit 1 can acquire the power output by the rectifying unit 2 to work at the moment, and therefore the power demand of the connected electric equipment is met. Similarly, when the number of the power supply processing circuits is plural, the control of the input power supply control circuit can also realize the output of plural kinds of power supplies, and the details are not repeated here.

According to the utility model, the multiple power supply input ends and the switch devices are arranged, so that the multiple-stage variable frequency cabinet can be connected with multiple input power supplies, and the input power supplies can be switched according to different application requirements, or different power supplies are used for supplying power simultaneously, so that different application requirements of users are met, and the practicability of the multiple-stage variable frequency cabinet is improved. According to the utility model, the plurality of switching devices are arranged to enable the multi-section frequency conversion cabinets to work independently, when one section of frequency conversion cabinet fails, the corresponding switching device can be controlled to be turned off, so that the corresponding power input is cut off, meanwhile, other frequency conversion cabinets can continue to work, the whole multi-section frequency conversion cabinet does not need to stop working for maintenance, and the working efficiency of the multi-section frequency conversion cabinet is ensured.

Referring to fig. 1 to 4, in an embodiment, the power input control circuit further includes:

the switch control circuit is electrically connected with the plurality of switching devices respectively and is used for controlling the corresponding switching devices to be closed when being triggered by a user and controlling the corresponding power input ends to be electrically connected with the power output ends so as to form one or more paths of power input branches.

It can be understood that the power source normally connected to the multi-stage variable frequency cabinet is a high-voltage alternating current power source, so that the switching device can select a high-voltage alternating current contactor with a higher withstand voltage value, and the switching device is usually driven by a motor to realize the switching on and off of the switch, and the switching on and off of the switch cannot be controlled manually. Thus, in the present embodiment, a switch control circuit is also provided for controlling the on or off of the switching device. The switch control circuit may be electrically connected to the coil of the switching device for controlling the coil of the switching device to be powered on or off so that the motor of the switching device drives the switching device to be turned on or off. The switch control circuit can be realized by selecting a switch tube, a processor and the like, and a user sends a control instruction to the processor through an input assembly or terminal equipment, and the processor controls the corresponding switch tube to be closed, so that the coil of the corresponding switch device is controlled to be electrically closed. Or, the switch control circuit can also be realized by a mechanical switch, the mechanical switch is arranged between the switching device and the power supply, and a user can manually control the mechanical switch to be closed, so as to control the coils of the corresponding switching devices to be electrically closed.

Referring to fig. 1 to 4, in an embodiment, the power input control circuit further includes:

and the interlocking control circuit is electrically connected with the switch control circuit and the plurality of switch devices respectively and is used for controlling the plurality of switch devices to interlock when being triggered by a user.

In this embodiment, the interlock control circuit may be implemented by using discrete devices such as a switching tube and a resistor, and is used for controlling the multiple switching devices to interlock when triggered by a user, that is, when any switch is closed and turned on, other switching devices cannot be closed and turned on, so that when only one section of the variable frequency cabinet is required to work, starting of other variable frequency cabinets caused by misoperation can be prevented, and the safety of the multi-section variable frequency cabinet is improved. In a specific embodiment, referring to fig. 3 and 4, fig. 3 and 4 are schematic circuit structures of two switching devices and an interlocking control circuit, wherein X1 to X23 are power inputs, the two switching devices are contactors QF1 and QF11, the interlocking control circuit is composed of a knob switch SA3 and a relay KA8, before the relay KA8 is electrically attracted, a 21 contact and a 22 contact of the relay KA8 are connected, a 31 contact and a 32 contact are connected, when a user triggers the knob switch SA to be closed and conducted, the relay KA8 is electrically attracted, the 21 contact and the 24 contact of the relay KA8 are connected, and the 31 contact and the 34 contact are connected. At this time, if the switch control circuit controls the switch KT1 to be closed, the closing coil of the contactor QF1 is powered on, the motor drives the contactor QF1 to close, and the contact 41 and the contact 44 of the contactor QF1 are connected, so that the power at the end X10 cannot be output to the ends X11 and X12, and therefore, even if the switch control circuit controls the switch KT2 to be closed, the closing coil of the contactor QF11 cannot be powered on, and the interlocking between the contactor QF1 and the contactor QF11 is realized. On the contrary, when the contactor QF11 is closed, the contact 41 and the contact 42 of the contactor QF11 are disconnected electrically, and at the moment, even if the control switch KT1 is closed, the closing coil of the contactor QF1 cannot be powered on, so that the interlocking between the contactor QF1 and the contactor QF11 is realized.

Optionally, the power input control circuit further includes:

the interlocking state indicating circuit is electrically connected with the interlocking control circuit and is used for outputting corresponding interlocking state indicating information when the interlocking control circuit is triggered by a user.

In this embodiment, the interlocking state indicating circuit may be implemented by using a prompting device such as an LED lamp, and is configured to output corresponding indicating information to prompt a user of a working state of the interlocking control circuit. Referring to fig. 3, fig. 3 is a schematic circuit structure diagram of an interlocking state indicating circuit, the interlocking state indicating circuit is composed of LED lamps SB4 and SB5, when the relay KA8 is not electrically sucked, the 11 contact and the 12 contact of the relay KA8 are connected, at this time, the LED lamp SB5 is on, the LED lamp SB4 is not on, when the relay KA8 is electrically sucked, the 11 contact and the 14 contact of the relay KA8 are connected, at this time, the LED lamp SB4 is on, the LED lamp SB5 is not on, so that a user can determine the working state of the interlocking control circuit through the on-off state of the corresponding LED lamp.

Optionally, the feedback end of each switching device is further connected to the receiving end of the switch control circuit, and the switching device is further configured to output a switch feedback signal to the switch control circuit when closed.

In this embodiment, the FEEDBACK end FEEDBACK of the switching device is further connected to the receiving end of the switching control circuit, so as to output a switching FEEDBACK signal to the switching control circuit when the switching device is closed, so that the switching control circuit knows that the switching device is successfully closed, and at this time, the switching control circuit can inform the controller of the frequency conversion cabinet in a communication manner to control the rectifying unit and the inverting unit to start working. Referring to fig. 3, fig. 3 is a schematic circuit structure of a switching device, the switching device is a contactor QF1, a contact 21 of the contactor QF1 is a FEEDBACK end FEEDBACK of the switching device, when the contactor QF1 is closed, the contact 21 is electrically connected with a contact 24, and at this time, a power supply outputs a high level to a switching control circuit through the contact 21, that is, outputs a switching FEEDBACK signal.

Referring to fig. 1 to 4, in an embodiment, the power input control circuit further includes:

and each switch state indicating circuit is electrically connected with one switch device and is used for outputting corresponding switch state indicating information when the corresponding switch device is closed.

In this embodiment, the switch state indicating circuit may be implemented by using a prompting device such as an LED lamp, and is configured to output corresponding indication information to prompt a user of the switch state of the switch device. Referring to fig. 3, fig. 3 is a schematic circuit diagram of a switch state indicating circuit, where the switch state indicating circuit is composed of LED lamps SB1 and SB2, when the contactor QF1 is not electrically attracted, the contact 11 is connected with the contact 12, at this time, the LED lamp SB2 is on, the LED lamp SB1 is not on, when the contactor QF1 is electrically attracted, the contact 11 is connected with the contact 14, at this time, the LED lamp SB1 is on, the LED lamp SB2 is not on, so that a user can determine the on-off state of the switching device through the on-off state of the corresponding LED lamp.

Referring to fig. 1 to 3, in an embodiment, the power input control circuit further includes:

the emergency stop control circuit is respectively and electrically connected with the switching devices, and is used for controlling each switching device to be turned off when the emergency stop control circuit is triggered by a user so as to disconnect the electrical connection between each power input end and each power output end.

In this embodiment, the emergency stop control circuit may be implemented by using a switching tube, a processor, or the like, and may be connected to an under-voltage trip coil of the switching device, where when the user triggers the emergency stop control circuit, the under-voltage trip coil of the switching device is controlled to lose power, so as to control the switching device to be turned off. Referring to fig. 3, fig. 3 is a schematic circuit diagram of an emergency stop control circuit, the emergency stop control circuit is composed of switching tubes KA4 and KA1, when the switching tube KA4 and/or the switching tube KA1 are turned off, an under-voltage tripping coil of the contactor QF1 is deenergized, so that the contactor QF1 is controlled to be turned off, the electrical connection between a power input end and a power output end is disconnected, and similarly, the contactor QF11 is also controlled to realize switching-off based on the control of the emergency stop control circuit. It can be understood that the switching tube in the scram control circuit can be turned on or off based on the control of the processor, and can also be a mechanical switch based on the control of a user.

The utility model also provides a multi-section variable frequency cabinet, which comprises:

a power input control circuit as described above;

the input ends of the power supply processing circuits are connected with the power supply output ends of the power supply input control circuits.

Optionally, each of the power supply processing circuits includes:

the input end of the rectifying unit is connected with the power output end of the power input control circuit, and the rectifying unit is used for rectifying the power output by the power input control circuit and outputting the power;

the input end of the inversion unit is connected with the output end of the rectification unit, and the inversion unit is used for converting the direct current power supply output by the rectification unit into an alternating current power supply and then outputting the alternating current power supply.

In this embodiment, each rectifying unit rectifies an input ac power and sends the rectified power to the inverter unit through the dc bus, and the inverter unit inverts the dc power and outputs the inverted dc power to electric equipment such as a motor and a pump, where each rectifying unit, the dc bus and the inverter unit can be regarded as a section of the variable-frequency cabinet. The rectifying unit is connected into an input power supply through the power supply input control circuit, and a user can control the corresponding switching devices in the power supply input control circuit to be conducted so as to control the corresponding section of frequency conversion cabinet to work, and can also open all the switching devices in the power supply input control circuit at the same time so that the sections of frequency conversion cabinets work at the same time. The specific structure of the power input control circuit refers to the above embodiments, and because the multi-stage variable frequency cabinet adopts all the technical schemes of all the embodiments, the power input control circuit at least has all the beneficial effects brought by the technical schemes of the embodiments, and the description is omitted here.

In an embodiment, the multi-stage variable frequency cabinet further comprises:

the output switch circuit is arranged between the input ends of the two inversion units in series, and is used for controlling the input end of one inversion unit to be electrically connected with the input end of the other inversion unit when being conducted.

In an embodiment, an output switch circuit is further disposed between the input ends of the two inverter units, and is used for controlling the input ends of the two inverter units to be electrically connected when the two inverter units are conducted, so that the voltage output by the rectifying unit of one section of the frequency conversion cabinet can be output to the inverter unit of the other section of the frequency conversion cabinet through the output switch circuit, and reasonable application of the input power supply is achieved. Referring to fig. 1, fig. 1 is a schematic diagram of a functional module of an embodiment of a multi-stage variable frequency cabinet, when an output switch circuit is turned on, if a control switch device QF1 is turned on, a rectifying unit 1 can output voltage to two inversion units, so that both inversion units work, or only any inversion unit can be controlled to work, that is, a user can control the corresponding rectifying unit to work in cooperation with the inversion unit according to actual application requirements, so as to realize reasonable application of different input power sources. It can be understood that when the accessed input power supply voltage is the same as the frequency, the output switch circuit can be controlled to be conducted, and the multistage frequency conversion cabinet is controlled to work simultaneously, so that the common application of the input power supply is realized.

In another embodiment, the multi-section variable frequency cabinet further comprises:

connect the copper bar soon, connect the copper bar soon and dismantle and connect between two the input of contravariant unit, connect the copper bar soon and be used for realizing two the electricity is connected between the input of contravariant unit.

In another embodiment, a detachable quick copper bar is further arranged between the input ends of the two inverter units, the detachable quick copper bar can be regarded as a switch tube and is used for controlling the connection or disconnection of a passage between the input ends of the two inverter units, when the quick copper bar is installed by a user, the input ends of the two inverter units are electrically connected, so that the voltage output by the rectifying unit of one section of frequency conversion cabinet can be output to the inverter unit of the other section of frequency conversion cabinet through the output switch circuit, and the reasonable application of the input power supply is realized. Referring to fig. 2, fig. 2 is a schematic diagram of a functional module of another embodiment of a multi-stage variable frequency cabinet, when a user installs a copper bar, if a control switch device QF1 is turned on, the rectifying unit 1 can output voltage to two inversion units, so that both inversion units work, or only any one inversion unit can be controlled to work, that is, the user can control the corresponding rectifying unit to work with the inversion unit according to actual application requirements, so as to realize reasonable application of different input power sources. It can be understood that when the input power supply voltage and the frequency are the same, the quick-connection copper bar can be installed, and the multistage variable frequency cabinet is controlled to work simultaneously, so that the common application of the input power supply is realized.

Referring to fig. 1, in one embodiment, the number of power supply processing circuits is two;

the multistage variable frequency cabinet still includes:

the control unit is respectively and electrically connected with the power input control circuit and the output switch circuit, and is used for controlling one switch device in the power input control circuit to be conducted and controlling the output switch circuit to be conducted when receiving a first mode signal;

the control unit is also used for controlling one switching device in the power input control circuit to be turned on and controlling the output switching circuit to be turned off when receiving a second mode signal;

the control unit is also used for controlling the two switching devices in the power input control circuit to be conducted and controlling the output switching circuit to be conducted when receiving a third mode signal; the method comprises the steps of,

the control unit is also used for controlling the two switching devices in the power input control circuit to be conducted and controlling the output switching circuit to be turned off when receiving a fourth mode signal.

In this embodiment, the number of the power supply processing circuits is two, and correspondingly, the number of the switching devices in the power supply input control circuit is also two, and the control unit is composed of a CPLD, FPGA, MCU processor and other processors, so as to realize the control of the power supply input control circuit and the output switching circuit. It can be understood that a user can send a corresponding control instruction to the control unit through the input component or the external terminal according to actual application requirements, so that the control unit can control the on/off of the corresponding switching device and the output switching circuit, and the multi-section frequency conversion cabinet can work in different modes. For example, when the power input terminal 1 is connected to an input power supply and the power input terminal 2 is not connected to a power supply, the user can send a first mode signal to the control unit, so that the control unit controls the switching device QF1 to be turned on and controls the output switching circuit to be turned on, and both the two inverter units can work and output, and at the moment, the user can obtain two paths of power supply outputs; the user can also send a second mode signal to the control unit, so that the control unit controls the switching device QF1 to be conducted, controls the output switching circuit to be turned off, and enables the inversion unit 1 to work and output, and at the moment, the user can obtain one path of power supply output; when the voltage and the frequency of the input power supply accessed by the power supply input end 1 and the power supply input end 2 are the same, a user can send a third mode signal to the control unit, so that the control unit controls the switching device QF1 to be conducted with the switching device QF11 and controls the output switching circuit to be conducted, and both the two inverter units can work and output, and at the moment, the user can obtain two paths of same power supply output; when the power input end 1 and the power input end 2 are connected with different input power sources, a user can send a fourth mode signal to the control unit, so that the control unit controls the switching device QF1 and the switching device QF11 to be conducted, controls the output switching circuit to be turned off, and enables the two paths of inversion units to work and output, and at the moment, the user can obtain two paths of different power source outputs. By the arrangement, a user can send corresponding control instructions to the control unit through the input assembly or the external terminal according to actual application requirements, so that the control unit can control the corresponding switching devices and the output switching circuits to be turned on/off, the multi-section frequency conversion cabinet can work in different modes, and the applicability and the practicability of the multi-section frequency conversion cabinet are improved.

The foregoing description is only of the preferred embodiments of the present utility model and is not intended to limit the scope of the utility model, and all equivalent structural changes made by the description of the present utility model and the accompanying drawings or direct/indirect application in other related technical fields are included in the scope of the utility model.

Claims (10)

1. The utility model provides a power input control circuit, is applied to in multistage frequency conversion cabinet, multistage frequency conversion cabinet includes a plurality of power processing circuit, its characterized in that, power input control circuit includes:

a plurality of power input terminals for accessing an input power;

the power supply output ends are used for being connected with the power supply processing circuit;

and each switching device is used for controlling the corresponding power input end to be electrically connected with the power output end when being closed so as to form a power input branch.

2. The power input control circuit of claim 1, wherein the power input control circuit further comprises:

the switch control circuit is electrically connected with the plurality of switching devices respectively and is used for controlling the corresponding switching devices to be closed when being triggered by a user and controlling the corresponding power input ends to be electrically connected with the power output ends so as to form one or more paths of power input branches.

3. The power input control circuit of claim 2, wherein the feedback terminal of each of the switching devices is further coupled to the receiving terminal of the switching control circuit, the switching devices further configured to output a switching feedback signal to the switching control circuit when closed.

4. The power input control circuit of claim 2, wherein the power input control circuit further comprises:

and the interlocking control circuit is electrically connected with the switch control circuit and the plurality of switch devices respectively and is used for controlling the plurality of switch devices to interlock when being triggered by a user.

5. The power input control circuit of claim 1, wherein the power input control circuit further comprises:

the emergency stop control circuit is respectively and electrically connected with the switching devices, and is used for controlling each switching device to be turned off when the emergency stop control circuit is triggered by a user so as to disconnect the electrical connection between each power input end and each power output end.

6. A multi-section variable frequency cabinet, comprising:

a power input control circuit as claimed in any one of claims 1 to 5;

the input ends of the power supply processing circuits are connected with the power supply output ends of the power supply input control circuits.

7. The multi-segment variable frequency cabinet of claim 6, wherein each of the power processing circuits comprises:

the input end of the rectifying unit is connected with the power output end of the power input control circuit, and the rectifying unit is used for rectifying the power output by the power input control circuit and outputting the power;

the input end of the inversion unit is connected with the output end of the rectification unit, and the inversion unit is used for converting the direct current power supply output by the rectification unit into an alternating current power supply and then outputting the alternating current power supply.

8. The multi-section variable frequency cabinet of claim 7, further comprising:

the output switch circuit is arranged between the input ends of the two inversion units in series, and is used for controlling the input end of one inversion unit to be electrically connected with the input end of the other inversion unit when being conducted.

9. The multi-segment variable frequency cabinet of claim 8, wherein the number of power supply processing circuits is two;

the multistage variable frequency cabinet still includes:

the control unit is respectively and electrically connected with the power input control circuit and the output switch circuit, and is used for controlling one switch device in the power input control circuit to be conducted and controlling the output switch circuit to be conducted when receiving a first mode signal;

the control unit is also used for controlling one switching device in the power input control circuit to be turned on and controlling the output switching circuit to be turned off when receiving a second mode signal;

the control unit is also used for controlling the two switching devices in the power input control circuit to be conducted and controlling the output switching circuit to be conducted when receiving a third mode signal; the method comprises the steps of,

the control unit is also used for controlling the two switching devices in the power input control circuit to be conducted and controlling the output switching circuit to be turned off when receiving a fourth mode signal.

10. The multi-section variable frequency cabinet of claim 7, further comprising:

connect the copper bar soon, connect the copper bar soon and dismantle and connect between two the input of contravariant unit, connect the copper bar soon and be used for realizing two the electricity is connected between the input of contravariant unit.