CN219287137U - Power distribution control switch circuit and auxiliary power distribution circuit - Google Patents

Abstract

The utility model discloses a power distribution control switch circuit and an auxiliary power distribution circuit, wherein the power distribution control switch circuit comprises: a power input and a power output; the input end of the switching circuit is connected with the power supply input end, the output end of the switching circuit is connected with the power supply output end, and the switching circuit is used for controlling the power supply input end to be electrically connected with the power supply output end when being conducted; the detection end of the sampling unit is connected with the input end and/or the output end of the switching circuit, and the sampling control circuit is used for collecting the voltage of the input end and/or the output end of the switching circuit and outputting a corresponding control signal; and the controlled end of the switch control circuit is connected with the control end of the sampling control circuit, and the switch control circuit is used for controlling the switch circuit to be turned on/off when receiving the control signal. The utility model can solve the problem that the overvoltage protection of the existing auxiliary power distribution circuit is not timely.

Description

Power distribution control switch circuit and auxiliary power distribution circuit

Technical Field

The utility model relates to the technical field of power distribution and power supply, in particular to a power distribution control switch circuit and an auxiliary power distribution circuit.

Background

At present, the application environment of photovoltaic and energy storage is more and more severe. The problems of the adaptation degree of the power grid or the power station equipment can lead to high-voltage oscillation of the power grid, overvoltage or higher harmonic occurs, and if a loop cannot be timely cut off, the related electric devices of the photovoltaic inverter and the energy storage PCS can have very long service life and withstand voltage challenges. For example, if the SVG device on the medium-voltage side causes abnormal power grid, the medium-voltage power grid has a plurality of higher harmonics in three phases, the oscillation amplitude is not converged and continuously increases, and under the condition, the photovoltaic inverter, the internal distribution transformer of the energy storage PCS device, the alternating current fan and the internal power supply board are subjected to higher harmonics and peak overvoltage of the power grid to cause failure. In the existing grid power system, when the power grid is abnormal, only the main power distribution loop is controlled to be disconnected, so that protection of main power equipment is realized, and the auxiliary power distribution loop is a protection scheme and strategy under the abnormal conditions of no overvoltage or higher harmonic wave and the like, namely, the power supply of the auxiliary power distribution loop cannot be cut off, and the failure is easily caused by the influence of higher harmonic wave and grid peak overvoltage on the photovoltaic inverter, the internal power distribution transformer of the energy storage PCS equipment, the alternating current fan and the internal power panel.

Disclosure of Invention

The utility model mainly aims to provide a power distribution control switch circuit, which aims to solve the problem that the overvoltage protection of the existing auxiliary power distribution circuit is not timely.

In order to achieve the above object, the present utility model provides a power distribution control switch circuit, comprising:

a power input and a power output;

the input end of the switching circuit is connected with the power input end, the output end of the switching circuit is connected with the power output end, and the switching circuit is used for controlling the power input end to be electrically connected with the power output end when being conducted;

the detection end of the sampling control circuit is connected with the input end and/or the output end of the switch circuit, and the sampling control circuit is used for collecting the voltage of the input end and/or the output end of the switch circuit and outputting a corresponding control signal;

the control end of the switch control circuit is connected with the control end of the sampling control circuit, and the switch control circuit is used for controlling the switch circuit to be turned on/off when receiving a control signal.

Optionally, the power input end is an ac input end, and is used for accessing an ac power supply;

the power supply output end is an alternating current output end and is used for being connected with a transformer.

Optionally, the power input end is a direct current input end and is used for being connected with a direct current power supply;

the power output end is a direct current output end and is used for being connected with the slow start loop and the power supply loop.

Optionally, the power input terminal includes:

the alternating current input end is used for being connected with an alternating current power supply;

the direct current input end is used for being connected with a direct current power supply;

the power output end comprises:

the alternating current output end is used for being connected with the transformer;

the direct current output end is used for being connected with the slow starting loop and the power supply loop.

Optionally, the ac input terminal includes:

the internal power supply input end is used for accessing a power grid;

and the external power supply input end is used for being connected with the alternating current power supply equipment.

Optionally, the power input terminal comprises a plurality of alternating current input terminals for accessing a power grid;

the power supply output end comprises a plurality of alternating current output ends, and each alternating current output end is used for being connected with a primary winding of a transformer.

Optionally, the switch control circuit includes:

the release is arranged in linkage with the switching circuit and is used for controlling the switching circuit to be turned off when being conducted;

the trigger driving circuit is electrically connected with the trigger, a controlled end of the trigger driving circuit is connected with a control end of the sampling control circuit, and the trigger driving circuit is used for controlling the trigger to be conducted when receiving a control signal so as to control the switch circuit to be turned off.

Optionally, the trip driving circuit includes a first electric fuse, a second electric fuse and a relay, the first end of the trip is connected with the output end of the relay, the input end of the relay is connected with the first end of the first electric fuse, the second end of the first electric fuse is connected with the secondary winding of the transformer, the second end of the trip is connected with the first end of the second electric fuse, the second end of the second electric fuse is connected with the secondary winding of the transformer, and the controlled end of the relay is connected with the sampling control circuit;

or, the release driving circuit comprises a first electric fuse, a second electric fuse, a relay and a rectifying and filtering component, wherein the first end of the release is connected with the output end of the relay, the input end of the relay is connected with the positive electrode output end of the rectifying and filtering component, the first input end of the rectifying and filtering component is connected with the first end of the first electric fuse, the second end of the first electric fuse is connected with the secondary winding of the transformer, the second end of the release is connected with the negative electrode output end of the rectifying and filtering component, the second input end of the rectifying and filtering component is connected with the first end of the second electric fuse, the second end of the second electric fuse is connected with the secondary winding of the transformer, and the controlled end of the relay is connected with the sampling control circuit.

The utility model also provides an auxiliary power distribution circuit which comprises a transformer, a slow start loop, a power supply loop and the power distribution control switch circuit;

and the power output end of the power distribution control switch circuit is connected with the primary winding of the transformer.

Optionally, the power output end of the power distribution control switch circuit comprises an external power supply output end and an internal power supply output end;

the auxiliary power distribution circuit further includes:

the input end of the external power supply switch circuit is connected with the external power supply output end of the power distribution control switch circuit, the output end of the external power supply switch circuit is connected with the primary winding of the transformer, and the external power supply switch circuit is used for controlling the external power supply output end of the power distribution control switch circuit to be electrically connected with the primary winding of the transformer when being conducted;

the internal power supply switch circuit is used for controlling the internal power supply output end of the power distribution control switch circuit to be electrically connected with the primary winding of the transformer when being conducted.

According to the technical scheme, the detection of the input power supply is realized by arranging the sampling control circuit, the switch control circuit and the switch circuit, and when overvoltage or higher harmonic exists in the input power supply, the switch circuit is controlled to be turned off, so that a passage between the power supply input end and the power supply output end is disconnected, and the power-off protection of a later-stage circuit is realized. The utility model does not depend on the central processing unit of the rear-stage power system, can respond and disconnect the power supply input in time when the overvoltage or the higher harmonic exists in the input power supply, can quickly and effectively realize the protection of the rear-stage power system, can avoid the risk of failure or damage caused by the occurrence of the overvoltage or the higher harmonic of the input power supply of the rear-stage power system, improves the safety and the stability of the system, and solves the problem of untimely overvoltage protection of the traditional auxiliary power distribution circuit.

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 blocks of an embodiment of a power distribution control switching circuit according to the present utility model;

FIG. 2 is a schematic diagram of functional blocks of another embodiment of a power distribution control switching circuit according to the present utility model;

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

FIG. 4 is a schematic circuit diagram of another embodiment of a power distribution control switch circuit according to the present utility model;

fig. 5 is a schematic circuit diagram of a power distribution control switch circuit according to another embodiment of the present utility model.

Reference numerals illustrate:

reference numerals	Name of the name	Reference numerals	Name of the name
				10	Switching circuit	K1	Relay device
20	Sampling control circuit	T1	Transformer
				30	Switch control circuit	PE	Rectifying and filtering assembly
Q1	Release device	F1～F8	First to eighth electric fuses

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.

The utility model provides a power distribution control switch circuit.

At present, in the existing grid power system, when the power grid is abnormal, only the main power distribution loop is controlled to be disconnected, so that protection of main power equipment is realized, and the auxiliary power distribution loop is a protection scheme and strategy under the abnormal conditions of no overvoltage or higher harmonic wave and the like, namely, the power supply of the auxiliary power distribution loop cannot be cut off, and the failure is easily caused by the influence of higher harmonic wave and grid peak overvoltage on the photovoltaic inverter, the internal power distribution transformer of the energy storage PCS equipment, the alternating current fan and the internal power panel.

To solve the above-mentioned problems, referring to fig. 1 to 5, in an embodiment, the power distribution control switching circuit includes:

a power input and a power output;

the input end of the switch circuit 10 is connected with the power input end, the output end of the switch circuit 10 is connected with the power output end, and the switch circuit 10 is used for controlling the power input end to be electrically connected with the power output end when being conducted;

the detection end of the sampling control circuit 20 is connected with the input end and/or the output end of the switch circuit 10, and the sampling control circuit 20 is used for collecting the voltage of the input end and/or the output end of the switch circuit 10 and outputting a corresponding control signal;

and the control end of the switch control circuit 30 is connected with the control end of the sampling control circuit 20, and the switch control circuit 30 is used for controlling the on/off of the switch circuit 10 when receiving a control signal.

In this embodiment, the power distribution control switch circuit may be applied to devices such as a photovoltaic inverter and an energy storage PCS, where the power input end may be used to access a power grid, an ac power device, a dc power device, and the like, the power output end may be used to access a transformer T1 to perform voltage conversion on an ac power of the power grid or the ac power device and output the converted voltage, and may also be used to access a dc circuit such as a slow start loop, so that the accessed dc power supplies power to a rear stage circuit. The switch circuit 10 can be a micro-breaker, a relay or an isolating switch with a disconnection function to realize the on/off of a passage between a power input end and a power output end, the sampling control circuit 20 can be a sampling chip and a microprocessor, the sampling chip is used for collecting the voltage of the input end and/or the output end of the switch circuit 10 and outputting a corresponding voltage collecting signal to the microprocessor, the microprocessor judges whether the connected power supply is over-voltage or has higher harmonics according to the voltage collecting signal, and when the connected power supply is over-voltage or has higher harmonics, the microprocessor outputs a control signal to control the switch circuit 10 to disconnect the passage between the power input end and the power output end so as to realize power-off protection. The switch control circuit 30 can be implemented by selecting the release Q1 and the relay K1, and can be set by using the release Q1 and the switch circuit 10 in a linkage manner, the relay K1 is used for controlling the on-off of a path between the release Q1 and the power supply, and when the switch control circuit 30 receives a control signal, the release Q1 is controlled to be turned on, so as to drive the switch circuit 10 to be turned off, and then the path between the power supply input end and the power supply output end is turned off, so as to realize power-off protection.

In addition, the sampling point of the sampling control circuit 20 may be set according to the actual use requirement, and may be set at the input end or the output end of the switch circuit 10, or may be set at both the input end and the output end. It can be appreciated that when the sampling point is disposed at the input end of the switch circuit 10, that is, at the front stage of the switch circuit 10, the accuracy and timeliness of sampling can be improved, so as to improve the accuracy of sampling judgment. When the sampling point is set at the output end of the switch circuit 10, that is, the rear stage of the switch circuit 10, when the switch circuit 10 is turned off, the voltage at the output end of the switch circuit 10 is 0, the sampling end of the sampling control circuit 20 does not have voltage for a long time, the sampling control circuit 20 can be prevented from being damaged due to long-time voltage detection, and the safety of the power distribution control switch circuit is improved.

The utility model realizes the detection of the input power supply by arranging the sampling control circuit 20, the switch control circuit 30 and the switch circuit 10, and controls the switch circuit 10 to be turned off when the input power supply has overvoltage or higher harmonic, so that the passage between the power supply input end and the power supply output end is disconnected, the disconnection of a power distribution loop is realized, and the power-off protection of a later-stage circuit is realized. The utility model can be applied to an auxiliary power distribution loop as a protection scheme and strategy of the auxiliary power distribution loop under the abnormal conditions of overvoltage, higher harmonic and the like, thereby realizing the power-off protection of devices such as a photovoltaic inverter, an internal power distribution transformer of an energy storage PCS device, an alternating current fan, an internal power panel and the like. Meanwhile, the utility model does not depend on the central processing unit of the rear-stage power system, can respond and disconnect the power supply input in time when the overvoltage or the higher harmonic exists in the input power supply, can quickly and effectively realize the protection of the rear-stage power system, can avoid the risk of failure or damage caused by the occurrence of the overvoltage or the higher harmonic in the input power supply of the rear-stage power system, and improves the safety and the stability of the system.

Referring to fig. 1 to 5, in an embodiment, the power input terminal is an ac input terminal, and is used for connecting to an ac power supply;

the power output end is an alternating current output end and is used for being connected to the transformer T1.

In this embodiment, the power input end is used for accessing an ac power source such as a power grid, an ac power source device, and the like, and correspondingly, the power output end is used for accessing a transformer T1 to perform voltage conversion on the ac power source of the power grid or the ac power source device and then output the converted voltage. It can be understood that the connected transformer T1 may be a single-phase transformer T1 or a three-phase transformer T1, and when the connected transformer T1 is a three-phase transformer T1, the number of power input ends and power output ends should be three, and each power output end is connected to a primary winding of a three-phase transformer T1. Referring to fig. 3, fig. 3 is a schematic circuit diagram of an embodiment of a power distribution control switch circuit, in which three power input ends and three power output ends are respectively connected, the power input ends are connected to a power grid, and the power output ends are connected to a three-phase transformer T1. The acquisition control circuit detects the input voltage and controls the switch circuit 10 to be turned off when the input voltage is over-voltage or high-order harmonic exists, so that the electric connection between the power grid and the transformer T1 is disconnected, and the power-off protection is realized.

Optionally, the power input end is a direct current input end and is used for being connected with a direct current power supply;

the power output end is a direct current output end and is used for being connected with the slow start loop and the power supply loop.

In an embodiment, the power input end is used for being connected to a dc power supply such as a dc power supply device, and correspondingly, the power output end is used for being connected to a circuit or a device requiring dc power supply such as a slow start circuit and a power supply circuit, so that the connected dc power supply supplies power to a subsequent circuit or a device. The sampling control circuit 20 may also be used to detect the voltage of the connected dc power supply, and control the switch circuit 10 to disconnect the dc power supply from the subsequent circuit or device when the dc power supply is over-voltage, so as to implement power-off protection.

Optionally, the power input terminal includes:

the alternating current input end is used for being connected with an alternating current power supply;

the direct current input end is used for being connected with a direct current power supply;

the power output end comprises:

the alternating current output end is used for being connected with the transformer T1;

the direct current output end is used for being connected with the slow starting loop and the power supply loop.

In another embodiment, the power input end is divided into two types of input ports, i.e. an ac input end and a dc input end, which are used for accessing an ac power source such as a power grid and an ac power source device, and accessing a dc power source such as a dc power source device, and correspondingly, the power output end is also divided into two types of output ends, i.e. an ac output end and a dc output end, which are respectively used for accessing a circuit or device requiring dc power such as a transformer T1, a slow start loop and a power supply loop. Referring to fig. 4, fig. 4 is a schematic circuit diagram of an embodiment of a power distribution control switch circuit, in which three power input ends and power output ends are all five, three are ac input ends for accessing a power grid, the other two are dc input ends for accessing positive and negative poles of a dc power supply device, three power output ends are ac output ends for accessing a three-phase transformer T1, and two power output ends are dc output ends for accessing a slow start loop and a power supply loop. The acquisition control circuit detects the input voltage and controls the switch circuit 10 to be turned off when the input voltage is over-voltage or high-order harmonic exists, so that the electric connection between the power grid and the transformer T1 is disconnected, and the electric connection between the direct-current power supply, the slow start loop and the power supply loop is disconnected at the same time, so that the power-off protection is realized.

Optionally, the ac input terminal includes:

the internal power supply input end is used for accessing a power grid;

and the external power supply input end is used for being connected with the alternating current power supply equipment.

It will be appreciated that in actual use, the device accessing the grid will typically also access an externally powered ac power device as a backup switch. Thus, in an embodiment, the ac input may be further divided into an external power input for accessing the grid and an internal power input for accessing the ac power source equipment. Referring to fig. 5, fig. 5 is a schematic circuit diagram of an embodiment of a power distribution control switch circuit, in which the number of power input ends and power output ends is six, three input ends are used for accessing a power grid, the other three input ends are used for accessing an ac power device, the six output ends are correspondingly combined in pairs, and the two output ends are accessed to primary windings of a three-phase transformer T1. The acquisition control circuit detects the input voltage and controls the switch circuit 10 to be turned off when the input voltage is over-voltage or high-order harmonic exists, so that the electric connection between the power grid and the transformer T1 is disconnected, and the power-off protection is realized.

Optionally, the power input terminal comprises a plurality of alternating current input terminals for accessing a power grid;

the power supply output end comprises a plurality of alternating current output ends, and each alternating current output end is used for being connected with a primary winding of a transformer T1.

It can be understood that the connected transformer T1 may be a single-phase transformer T1 or a three-phase transformer T1, and when the connected transformer T1 is a three-phase transformer T1, the number of power input ends and power output ends should be three, and each power output end is connected to a primary winding of a three-phase transformer T1. Referring to fig. 3, fig. 3 is a schematic circuit diagram of an embodiment of a power distribution control switch circuit, in which three power input ends and three power output ends are respectively connected, the power input ends are connected to a power grid, and the power output ends are connected to a three-phase transformer T1. The acquisition control circuit detects the input voltage and controls the switch circuit 10 to be turned off when the input voltage is over-voltage or high-order harmonic exists, so that the electric connection between the power grid and the transformer T1 is disconnected, and the power-off protection is realized.

It can be understood that the power distribution control switch circuit can be applied to equipment connected with an alternating current power supply, equipment connected with a direct current power supply or equipment connected with the alternating current power supply and the direct current power supply simultaneously, for example, the power distribution control switch circuit can be applied to a photovoltaic inverter and an energy storage PCS, and can realize the voltage detection and power-off protection functions of the connected power supply.

Referring to fig. 1 to 5, in an embodiment, the switch control circuit 30 includes:

a release Q1, where the release Q1 is set in linkage with the switch circuit 10, and the release Q1 is used to control the switch circuit 10 to be turned off when turned on;

and the release driving circuit is electrically connected with the release Q1, a controlled end of the release driving circuit is connected with a control end of the sampling control circuit 20, and the release driving circuit is used for controlling the release Q1 to be conducted when receiving a control signal so as to control the switch circuit 10 to be turned off.

In this embodiment, the release Q1 is arranged in linkage with the switch circuit 10, where the release Q1 is a device for remotely controlling the opening and closing, and when the release driving circuit is used to shunt the release Q1 to be electrically conducted, the release Q1 can drive the switch circuit 10 to be turned off, so that the power input end and the power output end are disconnected. The acquisition control circuit detects input voltage and controls the work of the release driving circuit when the input voltage is over-voltage or high-order harmonic exists, so as to control the release Q1 to be conducted, and then drive the switch circuit 10 to be turned off, thereby disconnecting the electric connection between the power input end and the power output end and realizing power-off protection.

Optionally, the trip driving circuit includes a first electric fuse F1, a second electric fuse F2, and a relay K1, a first end of the trip Q1 is connected to an output end of the relay K1, an input end of the relay K1 is connected to the first end of the first electric fuse F1, a second end of the first electric fuse F1 is connected to a secondary winding of the transformer T1, a second end of the trip Q1 is connected to the first end of the second electric fuse F2, a second end of the second electric fuse F2 is connected to the secondary winding of the transformer T1, and a controlled end of the relay K1 is connected to the sampling control circuit;

or, the trip driving circuit includes a first electric fuse F1, a second electric fuse F2, a relay K1 and a rectifying and filtering component PE, a first end of the trip Q1 is connected with an output end of the relay K1, an input end of the relay K1 is connected with an anode output end of the rectifying and filtering component PE, a first input end of the rectifying and filtering component PE is connected with a first end of the first electric fuse F1, a second end of the first electric fuse F1 is connected with a secondary winding of the transformer T1, a second end of the trip Q1 is connected with a cathode output end of the rectifying and filtering component PE, a second input end of the rectifying and filtering component PE is connected with a first end of the second electric fuse F2, a second end of the second electric fuse F2 is connected with a secondary winding of the transformer T1, and a controlled end of the relay K1 is connected with the sampling control circuit.

Referring to fig. 3, fig. 3 is a schematic circuit diagram of an implementation of a trip driving circuit, where the trip driving circuit is composed of a first electric fuse F1, a second electric fuse F2 and a relay K1, two ends of a trip Q1 are connected with a secondary winding of a transformer T1 through the electric fuse and the relay K1, a voltage output by the transformer T1 provides a power supply when the trip Q1 is turned on, and the trip Q1 is provided with a power supply by an alternating current. When the control circuit detects that the input voltage is over-voltage or higher harmonic exists, the relay K1 is controlled to be conducted and closed by the control circuit, so that the release Q1 is electrically conducted, and the switch circuit 10 is turned off to realize power-off protection. It can be appreciated that the power source of the release Q1 is output by the transformer T1, and the power output of the transformer T1 is directly utilized, so that additional power supply setting can be reduced, thereby reducing the cost and volume of the device.

Referring to fig. 4, fig. 4 is a schematic circuit diagram of an implementation of a trip driving circuit, where the trip driving circuit is composed of a first electric fuse F1, a second electric fuse F2, a relay K1 and a rectifying and filtering component PE, two ends of a trip Q1 are connected with the rectifying and filtering component PE through a capacitor wire and the relay K1, and the rectifying and filtering component PE is used to convert an alternating current output by a secondary winding into a direct current output, and provide a power supply for the trip Q1 when the trip Q1 is turned on, and the trip Q1 is powered by the direct current. When the control circuit detects that the input voltage is over-voltage or higher harmonic exists, the relay K1 is controlled to be conducted and closed by the control circuit, so that the release Q1 is electrically conducted, and the switch circuit 10 is turned off to realize power-off protection. It can be appreciated that the power source of the release Q1 is output by the transformer T1, and the power output of the transformer T1 is directly utilized, so that additional power supply setting can be reduced, thereby reducing the cost and volume of the device. It can be understood that the two tripper driving circuits are different in that the power supply of the tripper Q1 is direct current or alternating current, so in practical application, the power-off protection function in the present utility model can be realized by selecting the corresponding circuit topology according to the use requirement or according to the type of the tripper Q1 used.

The utility model also provides an auxiliary power distribution circuit which comprises a transformer T1, a slow start loop, a power supply loop and the power distribution control switch circuit;

and the power output end of the power distribution control switch circuit is connected with the primary winding of the transformer T1.

The specific structure of the power distribution control switch circuit refers to the above embodiments, and because the auxiliary power distribution circuit adopts all the technical schemes of all the embodiments, the auxiliary power distribution circuit has at least all the beneficial effects brought by the technical schemes of the embodiments, and the description is omitted herein.

Optionally, the power output end of the power distribution control switch circuit comprises an external power supply output end and an internal power supply output end;

the auxiliary power distribution circuit further includes:

the external power supply switch circuit 10, the input end of the external power supply switch circuit 10 is connected with the external power supply output end of the power distribution control switch circuit, the output end of the external power supply switch circuit 10 is connected with the primary winding of the transformer T1, and the external power supply switch circuit 10 is used for controlling the external power supply output end of the power distribution control switch circuit to be electrically connected with the primary winding of the transformer T1 when being conducted;

the internal power supply switch circuit 10, the input end of the internal power supply switch circuit 10 is connected with the internal power supply output end of the distribution control switch circuit, the output end of the internal power supply switch circuit 10 is connected with the primary winding of the transformer T1, and the internal power supply switch circuit 10 is used for controlling the internal power supply output end of the distribution control switch circuit to be electrically connected with the primary winding of the transformer T1 when being conducted.

Referring to fig. 5, fig. 5 is a schematic circuit diagram of an embodiment of an auxiliary power distribution circuit, in which the number of power input ends and power output ends is six, three input ends are used for accessing a power grid, the other three input ends are used for accessing an ac power device, the six output ends are correspondingly combined in pairs, and the two output ends are accessed to primary windings of a three-phase transformer T1. The acquisition control circuit detects the input voltage and controls the switch circuit 10 to be turned off when the input voltage is over-voltage or high-order harmonic exists, so that the electric connection between the power grid and the transformer T1 is disconnected, and the power-off protection is realized. In addition, an external power supply switch circuit 10 is further arranged between the primary winding of the transformer T1 and the external power supply output end, and an internal power supply switch circuit 10 is further arranged between the primary winding of the transformer and the internal power supply output end, the external power supply switch circuit 10 and the internal power supply switch circuit 10 can be realized by mechanical switches, and a user can control the on or off of the external power supply switch circuit 10 and the internal power supply switch circuit 10 according to actual application scenes, so that the internal power supply and the external power supply of the system can be switched. For example, when a power grid fails, a user may turn off the internal power supply switching circuit 10 and control the external power supply switching circuit 10 to be turned on, thereby switching to external power supply. Further, by setting the external power supply switch circuit 10 and the internal power supply switch circuit 10, the auxiliary power distribution circuit can be doubly protected, for example, when the power distribution control switch circuit fails, a user can manually control the external power supply switch circuit 10 and the internal power supply switch circuit 10 to be turned off, so that fault detection is performed after the system is powered off, and the stability and the safety of the auxiliary power distribution circuit 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. A power distribution control switching circuit, the power distribution control switching circuit comprising:

a power input and a power output;

the input end of the switching circuit is connected with the power input end, the output end of the switching circuit is connected with the power output end, and the switching circuit is used for controlling the power input end to be electrically connected with the power output end when being conducted;

the detection end of the sampling control circuit is connected with the input end and/or the output end of the switch circuit, and the sampling control circuit is used for collecting the voltage of the input end and/or the output end of the switch circuit and outputting a corresponding control signal;

the control end of the switch control circuit is connected with the control end of the sampling control circuit, and the switch control circuit is used for controlling the switch circuit to be turned on/off when receiving a control signal.

2. The power distribution control switching circuit of claim 1 wherein said power input is an ac input for accessing an ac power source;

the power supply output end is an alternating current output end and is used for being connected with a transformer.

3. The power distribution control switching circuit according to claim 1, wherein the power input is a dc input for accessing a dc power source;

the power output end is a direct current output end and is used for being connected with the slow start loop and the power supply loop.

4. The power distribution control switching circuit of claim 1 wherein said power supply input comprises:

the alternating current input end is used for being connected with an alternating current power supply;

the direct current input end is used for being connected with a direct current power supply;

the power output end comprises:

the alternating current output end is used for being connected with the transformer;

the direct current output end is used for being connected with the slow starting loop and the power supply loop.

5. The power distribution control switching circuit of claim 2 or 4 wherein said ac input comprises:

the internal power supply input end is used for accessing a power grid;

and the external power supply input end is used for being connected with the alternating current power supply equipment.

6. The power distribution control switching circuit of claim 1 wherein said power supply input comprises a plurality of ac inputs for accessing a power grid;

the power supply output end comprises a plurality of alternating current output ends, and each alternating current output end is used for being connected with a primary winding of a transformer.

7. The power distribution control switching circuit of claim 1 wherein said switching control circuit comprises:

the release is arranged in linkage with the switching circuit and is used for controlling the switching circuit to be turned off when being conducted;

the trigger driving circuit is electrically connected with the trigger, a controlled end of the trigger driving circuit is connected with a control end of the sampling control circuit, and the trigger driving circuit is used for controlling the trigger to be conducted when receiving a control signal so as to control the switch circuit to be turned off.

8. The power distribution control switching circuit according to claim 7, wherein the trip drive circuit comprises a first electrical fuse, a second electrical fuse, and a relay, wherein a first end of the trip is connected to an output of the relay, an input of the relay is connected to the first end of the first electrical fuse, a second end of the first electrical fuse is connected to a secondary winding of a transformer, a second end of the trip is connected to the first end of the second electrical fuse, a second end of the second electrical fuse is connected to a secondary winding of the transformer, and a controlled end of the relay is connected to the sampling control circuit;

or, the release driving circuit comprises a first electric fuse, a second electric fuse, a relay and a rectifying and filtering component, wherein the first end of the release is connected with the output end of the relay, the input end of the relay is connected with the positive electrode output end of the rectifying and filtering component, the first input end of the rectifying and filtering component is connected with the first end of the first electric fuse, the second end of the first electric fuse is connected with the secondary winding of the transformer, the second end of the release is connected with the negative electrode output end of the rectifying and filtering component, the second input end of the rectifying and filtering component is connected with the first end of the second electric fuse, the second end of the second electric fuse is connected with the secondary winding of the transformer, and the controlled end of the relay is connected with the sampling control circuit.

9. An auxiliary power distribution circuit, characterized by comprising a transformer, a slow start loop, a power supply loop and a power distribution control switch circuit according to any one of claims 1-8;

and the power output end of the power distribution control switch circuit is connected with the primary winding of the transformer.

10. The auxiliary power distribution circuit of claim 9 wherein the power supply output of the power distribution control switching circuit comprises an external power supply output and an internal power supply output;

the auxiliary power distribution circuit further includes:

the input end of the external power supply switch circuit is connected with the external power supply output end of the power distribution control switch circuit, the output end of the external power supply switch circuit is connected with the primary winding of the transformer, and the external power supply switch circuit is used for controlling the external power supply output end of the power distribution control switch circuit to be electrically connected with the primary winding of the transformer when being conducted;

the internal power supply switch circuit is used for controlling the internal power supply output end of the power distribution control switch circuit to be electrically connected with the primary winding of the transformer when being conducted.

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