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. The power distribution control switch circuit comprises: a power supply input terminal and a power supply output terminal; The output terminal and the power supply output terminal, the switch circuit is used to electrically connect the control power supply input terminal and the power supply output terminal when it is turned on; the sampling control circuit, the detection terminal of the sampling unit is connected to the input terminal and/or output terminal of the switch circuit, and the sampling The control circuit is used to collect the voltage of the input terminal and/or output terminal of the switch circuit, and output the corresponding control signal; the switch control circuit, the controlled terminal of the switch control circuit is connected to the control terminal of the sampling control circuit, and the switch control circuit is used for When receiving the control signal, the control switch circuit is turned on/off. 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 technique

At present, the application environment of photovoltaic and energy storage is becoming more and more severe. The adaptability of the power grid or the problems of power station equipment will lead to high-voltage oscillations in the power grid, and the occurrence of overvoltage or high-order harmonics. If the circuit cannot be cut off in time, the related electrical components of the photovoltaic inverter and energy storage PCS will be damaged. There are great life and pressure challenges. For example, if the SVG device on the medium-voltage side causes an abnormality in the power grid, the three-phase medium-voltage power grid contains a large number of high-order harmonics, and the oscillation amplitude does not converge and continues to increase. Under this condition, the internal power distribution of the photovoltaic inverter and energy storage PCS equipment Transformers, AC fans, and internal power boards are ineffective due to high-order harmonics and grid peak overvoltage. In the existing power grid power system, when the power grid is abnormal, only the main power distribution circuit is controlled to disconnect, so as to realize the protection of the main power equipment, while the auxiliary power distribution circuit is free of abnormal conditions such as overvoltage or high-order harmonics The following protection schemes and strategies, that is, the power supply of the auxiliary power distribution circuit cannot be cut off, which will easily cause the internal distribution transformers, AC fans and internal power boards of photovoltaic inverters and energy storage PCS equipment to be easily affected by high-order harmonics and grid peak overvoltage effect causing failure.

Utility model content

The main purpose of the utility model is to propose a power distribution control switch circuit, aiming to solve the problem that the overvoltage protection of the existing auxiliary power distribution circuit is not timely.

In order to achieve the above purpose, the power distribution control switch circuit proposed by the utility model includes:

Power input and power output;

A switch circuit, the input end of the switch circuit is connected to the power input end, the output end of the switch circuit is connected to the power output end, and the switch circuit is used to control the power input end and the power supply output end when it is turned on The output terminal of the power supply is electrically connected;

A sampling control circuit, the detection terminal of the sampling control circuit is connected to the input terminal and/or output terminal of the switch circuit, and the sampling control circuit is used to collect the voltage of the input terminal and/or output terminal of the switch circuit, and Output the corresponding control signal;

A switch control circuit, the controlled terminal of the switch control circuit is connected to the control terminal of the sampling control circuit, and the switch control circuit is used to control the switch circuit to turn on/off when receiving a control signal.

Optionally, the power input terminal is an AC input terminal, used for connecting to an AC power supply;

The output end of the power supply is an AC output end for connecting to a transformer.

Optionally, the power supply input terminal is a DC input terminal for connecting to a DC power supply;

The output terminal of the power supply is a DC output terminal, which is used to connect to the slow start circuit and the power supply circuit.

Optionally, the power input terminal includes:

AC input terminal, used to connect to AC power supply;

The DC input terminal is used to connect to the DC power supply;

The power output includes:

AC output terminal, used to connect to the transformer;

The DC output terminal is used to connect to the slow start circuit and the power supply circuit.

Optionally, the AC input terminal includes:

Internal power supply input terminal for connecting to the power grid;

The external power supply input terminal is used to connect to the AC power supply equipment.

Optionally, the power input terminal includes a plurality of AC input terminals for connecting to the power grid;

The output terminal of the power supply includes a plurality of AC output terminals, and each of the AC output terminals is used to connect to a primary winding of a transformer.

Optionally, the switch control circuit includes:

A release, the release is set in linkage with the switch circuit, and the release is used to control the switch circuit to turn off when it is turned on;

A tripper driving circuit, the tripper driving circuit is electrically connected to the tripper, the controlled terminal of the tripper driving circuit is connected to the control terminal of the sampling control circuit, and the tripper drives The circuit is used to control the release to turn on when receiving the control signal, so as to control the switch circuit to turn off.

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

Alternatively, the release drive circuit includes a first electric fuse, a second electric fuse, a relay, and a rectification filter assembly, the first end of the release is connected to the output end of the relay, and the output end of the relay The input end is connected to the positive output end of the rectification filter assembly, the first input end of the rectification filter assembly is connected to the first end of the first electric fuse, and the second end of the first electric fuse is connected to the first end of the first electric fuse. The secondary winding of the transformer is connected, the second end of the release is connected to the negative output end of the rectification filter assembly, the second input end of the rectification filter assembly is connected to the first end of the second electric fuse connected, the second end of the second electric fuse is connected to the secondary winding of the transformer, and the controlled end of the relay is connected to the sampling control circuit.

The utility model also proposes an auxiliary power distribution circuit, the auxiliary power distribution circuit includes a transformer, a slow start circuit, a power supply circuit and the above-mentioned power distribution control switch circuit;

The power output end of the power distribution control switch circuit is connected to the primary winding of the transformer.

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

The auxiliary power distribution circuit also includes:

An external power supply switch circuit, the input terminal of the external power supply switch circuit is connected to the external power supply output terminal of the power distribution control switch circuit, the output terminal of the external power supply switch circuit is connected to the primary winding of the transformer, and the The external power supply switch circuit is used to control the electrical connection between the external power supply output terminal of the power distribution control switch circuit and the primary winding of the transformer when it is turned on;

An internal power supply switch circuit, the input end of the internal power supply switch circuit is connected to the internal power supply output end of the power distribution control switch circuit, the output end of the internal power supply switch circuit is connected to the primary winding of the transformer, and the The internal power supply switch circuit is used to control the internal power supply output end of the power distribution control switch circuit to be electrically connected to the primary winding of the transformer when it is turned on.

The technical scheme of the utility model realizes the detection of the input power supply by setting the sampling control circuit, the switch control circuit and the switch circuit, and when the input power supply has overvoltage or high-order harmonics, the control switch circuit is turned off, so that the power supply input The path between the terminal and the output terminal of the power supply is disconnected to realize power-off protection for the subsequent circuit. The utility model does not depend on the central processor of the subsequent power system, and can respond in time and disconnect the power supply input when there is overvoltage or high-order harmonics in the input power supply, and quickly and effectively realize the protection of the subsequent power system. It can avoid the risk of failure or damage caused by overvoltage or high-order harmonics in the input power system of the subsequent stage, improves the safety and stability of the system, and solves the problem of untimely overvoltage protection of the existing auxiliary power distribution circuit problem.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description These are only some embodiments of the present utility model, and those skilled in the art can also obtain other drawings according to the structures shown in these drawings without creative work.

Fig. 1 is a functional module schematic diagram of an embodiment of the utility model power distribution control switch circuit;

Fig. 2 is a functional module schematic diagram of another embodiment of the utility model power distribution control switch circuit;

Fig. 3 is a circuit structure schematic diagram of an embodiment of the utility model power distribution control switch circuit;

Fig. 4 is a schematic diagram of the circuit structure of another embodiment of the power distribution control switch circuit of the present invention;

FIG. 5 is a schematic diagram of the circuit structure of another embodiment of the power distribution control switch circuit of the present invention.

Explanation of reference numbers:

label name label name 10 switch circuit K1 relay 20 Sampling control circuit T1 transformer 30 switch control circuit PE Rectifier filter components Q1 trip unit F1～F8 The first electric fuse to the eighth electric fuse

The realization of the purpose of the utility model, functional characteristics and advantages will be further described in conjunction with the embodiments and with reference to the accompanying drawings.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Example. Based on the embodiments of the present utility model, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

It should be noted that if there is a directional indication (such as up, down, left, right, front, back...) in the embodiment of the present utility model, the directional indication is only used to explain the position in a certain posture (as shown in the accompanying drawing). If the relative positional relationship, movement conditions, etc. between the components shown in the figure below are changed, if the specific posture changes, the directional indication will also change accordingly.

In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present utility model, the descriptions of "first", "second", etc. Implying their relative importance or implying the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include at least one of these features. In addition, the technical solutions of the various embodiments can be combined with each other, but it must be based on the realization of those skilled in the art. When the combination of technical solutions is contradictory or cannot be realized, it should be considered that the combination of technical solutions does not exist , also not within the scope of protection required by the utility model.

The utility model provides a power distribution control switch circuit.

At present, in the existing grid power system, when the grid is abnormal, only the main power distribution circuit is controlled to disconnect, so as to realize the protection of the main power equipment, while the auxiliary power distribution circuit is free from overvoltage or high-order harmonics, etc. The protection scheme and strategy under abnormal conditions, that is, the power supply of the auxiliary power distribution circuit cannot be cut off, which will easily cause the internal distribution transformers, AC fans and internal power boards of photovoltaic inverters and energy storage PCS equipment to be easily affected by high-order harmonics and grid peaks. Failure due to overvoltage effects.

In order to solve the above problems, referring to Fig. 1 to Fig. 5, in one embodiment, the power distribution control switch circuit includes:

Power input and power output;

A switch circuit 10, the input terminal of the switch circuit 10 is connected to the input terminal of the power supply, the output terminal of the switch circuit 10 is connected to the output terminal of the power supply, and the switch circuit 10 is used to control the The power supply input terminal is electrically connected to the power supply output terminal;

A sampling control circuit 20, the detection end of the sampling control circuit is connected to the input and/or output of the switch circuit 10, the sampling control circuit 20 is used to collect the input and/or output of the switch circuit 10 Terminal voltage, and output the corresponding control signal;

A switch control circuit 30, the controlled terminal of the switch control circuit 30 is connected to the control terminal of the sampling control circuit 20, and the switch control circuit 30 is used to control the switch circuit 10 to conduct when receiving a control signal /shutdown.

In this embodiment, the power distribution control switching circuit can be applied to equipment such as photovoltaic inverters and energy storage PCS, the power input terminal can be used to connect to the power grid, AC power equipment and DC power equipment, etc., and the power output terminal can be used to It is connected to the transformer T1 to convert the AC power of the power grid or AC power equipment for output after voltage conversion. It can also be used to connect to DC circuits such as slow-start circuits, so that the connected DC power supplies power to the subsequent circuits. The switch circuit 10 can use a micro circuit breaker, a relay, or an isolating switch with a disconnect function to realize the conduction or shutdown of the path between the power input terminal and the power output terminal, and the sampling control circuit 20 can use a sampling chip and a microprocessor to realize Realize that the sampling chip is used to collect the voltage of the input terminal and/or output terminal of the switch circuit 10, and output the corresponding voltage collection signal to the microprocessor, and the microprocessor then judges whether the connected power supply is overvoltage or whether There are high-order harmonics, when the connected power supply is overvoltage or there are high-order harmonics, the microprocessor outputs a control signal to control the switch circuit 10 to disconnect the path between the power supply input terminal and the power supply output terminal, so as to realize power-off Protect. The switch control circuit 30 can be implemented by selecting the release Q1 and the relay K1, which can be set in conjunction with the release Q1 and the switch circuit 10, and the relay K1 is used to control the on-off of the path between the release Q1 and the power supply. When the control circuit 30 receives the control signal, it controls the release Q1 to turn on, thereby driving the switch circuit 10 to turn off, and then disconnects the path between the power input terminal and the power output terminal to realize power-off protection.

In addition, the sampling point of the sampling control circuit 20 can be set according to actual usage requirements, and can be set at the input end or output end of the switch circuit 10 , or can be set at both the input end and the output end. It can be understood that when the sampling point is set 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, thereby improving the accuracy of sampling judgment. When the sampling point is set at the output terminal 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 terminal of the switch circuit 10 is 0, and the sampling terminal of the sampling control circuit 20 will not The long-term presence of voltage can prevent the sampling control circuit 20 from being damaged due to long-term detection of voltage, and improves the safety of the power distribution control switch circuit.

The utility model realizes the detection of the input power by setting the sampling control circuit 20, the switch control circuit 30 and the switch circuit 10, and when the input power has overvoltage or high-order harmonics, the control switch circuit 10 is turned off, so that The path between the input terminal of the power supply and the output terminal of the power supply is disconnected, which realizes the cutting off of the power distribution circuit, thereby realizing the power-off protection of the subsequent circuit. The utility model can be applied to the auxiliary power distribution circuit as a protection scheme and strategy for the auxiliary power distribution circuit under abnormal conditions such as overvoltage or high-order harmonics, so as to realize the protection of the subsequent circuits, such as photovoltaic inverters and energy storage Power-off protection for power distribution transformers, AC fans and internal power boards inside PCS equipment. At the same time, the utility model does not rely on the central processor of the subsequent power system, and can respond in time and disconnect the power supply input when there is overvoltage or high-order harmonics in the input power supply, so as to quickly and effectively realize the power supply of the subsequent power system. Protection, which can avoid the risk of failure or damage caused by overvoltage or high-order harmonics in the input power system of the subsequent stage, and improves the safety and stability of the system.

Referring to Fig. 1 to Fig. 5, in one embodiment, the power input end is an AC input end for connecting to an AC power supply;

The output end of the power supply is an AC output end for connecting to the transformer T1.

In this embodiment, the power supply input terminal is used to connect to AC power sources such as the grid and AC power supply equipment, and correspondingly, the power supply output terminal is used to connect to the transformer T1 to convert the AC power of the grid or AC power supply equipment to output . It can be understood that the connected transformer T1 can be a single-phase transformer T1 or a three-phase transformer T1. When the connected transformer T1 is a three-phase transformer T1, the number of power input terminals and power output terminals should correspond to Three, each power output terminal is connected to the primary winding of a three-phase transformer T1. Referring to Fig. 3, Fig. 3 is a schematic diagram of the circuit structure of an embodiment of the power distribution control switch circuit. In the figure, there are three power input terminals and power output terminals. Three-phase transformer T1. The acquisition control circuit detects the input voltage, and controls the switch circuit 10 to turn off when the input voltage is overvoltage or high-order harmonic exists, so as to disconnect the electrical connection between the power grid and the transformer T1, and realize power-off protection.

Optionally, the power supply input terminal is a DC input terminal for connecting to a DC power supply;

The output terminal of the power supply is a DC output terminal, which is used to connect to the slow start circuit and the power supply circuit.

In one embodiment, the power supply input terminal is used to connect to DC power sources such as DC power supply equipment, and correspondingly, the power supply output terminal is used to connect to circuits or equipment that require DC power supply, such as slow-start circuits and power supply circuits, so that The connected DC power supplies power to the subsequent circuit or equipment. The sampling control circuit 20 can also be used to detect the voltage of the connected DC power supply, and when the DC power supply is overvoltage, control the switch circuit 10 to cut off the electrical connection between the DC power supply and subsequent circuits or devices, so as to realize power-off protection.

Optionally, the power input terminal includes:

AC input terminal, used to connect to AC power supply;

The DC input terminal is used to connect to the DC power supply;

The power output includes:

The AC output terminal is used to connect to the transformer T1;

The DC output terminal is used to connect to the slow start circuit and the power supply circuit.

In another embodiment, the power input terminals are divided into two types of input ports: AC input terminals and DC input terminals, which are used for connecting to AC power sources such as power grids and AC power supply equipment, and for connecting to DC power supplies such as DC power supply equipment. Correspondingly, the output terminals of the power supply are also divided into two types of output terminals: AC output terminals and DC output terminals, which are respectively used to connect to circuits or equipment requiring DC power supply such as the transformer T1, the slow start circuit, and the power supply circuit. Referring to Fig. 4, Fig. 4 is a schematic diagram of the circuit structure of an embodiment of the power distribution control switch circuit. There are five power input terminals and power output terminals in the figure, and three of them are AC input terminals for connecting to the power grid. Two are DC input terminals, used to connect to the positive and negative poles of DC power supply equipment, three power output terminals are AC output terminals, used to connect to three-phase transformer T1, and two power output terminals are DC output terminals, used for Connect to the slow start circuit and the power supply circuit. The acquisition control circuit detects the input voltage, and controls the switch circuit 10 to turn off when the input voltage is overvoltage or there is a high-order harmonic, thereby disconnecting the electrical connection between the power grid and the transformer T1, and simultaneously disconnecting the DC power supply, the slow start circuit and the power supply The electrical connection of the power supply circuit to achieve power failure protection.

Optionally, the AC input terminal includes:

Internal power supply input terminal for connecting to the power grid;

The external power supply input terminal is used to connect to the AC power supply equipment.

It can be understood that, in actual use, the equipment connected to the power grid is usually connected to an externally powered AC power supply as a backup switch. Therefore, in an embodiment, the AC input terminal can be further divided into an external power supply input terminal and an internal power supply input terminal, the internal power supply input terminal is used for connecting to a power grid, and the external power supply input terminal is used for connecting to an AC power supply device. Referring to Figure 5, Figure 5 is a schematic diagram of the circuit structure of an embodiment of the power distribution control switch circuit, in which there are six power input terminals and power output terminals, three of which are used to connect to the power grid, and the other three input terminals The terminals are used to connect to AC power equipment, the six output terminals are combined in pairs, and the two output terminals are connected to the primary winding of a three-phase transformer T1. The acquisition control circuit detects the input voltage, and controls the switch circuit 10 to turn off when the input voltage is overvoltage or high-order harmonic exists, so as to disconnect the electrical connection between the power grid and the transformer T1, and realize power-off protection.

Optionally, the power input terminal includes a plurality of AC input terminals for connecting to the power grid;

The output terminal of the power supply includes a plurality of AC output terminals, and each of the AC output terminals is used to connect to a primary winding of a transformer T1.

It can be understood that the connected transformer T1 can be a single-phase transformer T1 or a three-phase transformer T1. When the connected transformer T1 is a three-phase transformer T1, the number of power input terminals and power output terminals should correspond to Three, each power output terminal is connected to the primary winding of a three-phase transformer T1. Referring to Fig. 3, Fig. 3 is a schematic diagram of the circuit structure of an embodiment of the power distribution control switch circuit. In the figure, there are three power input terminals and power output terminals. Three-phase transformer T1. The acquisition control circuit detects the input voltage, and controls the switch circuit 10 to turn off when the input voltage is overvoltage or high-order harmonic exists, so as to disconnect the electrical connection between the power grid and the transformer T1, and realize power-off protection.

It can be understood that the above power distribution control switch circuit can be applied to equipment connected to AC power, equipment connected to DC power, or equipment connected to AC power and DC power at the same time, for example, it can be applied to photovoltaic inverters Both the voltage detection and power-off protection functions of the access power supply can be realized in the energy storage PCS. The utility model has a wide range of application scenarios, a simple structure, and is easy to implement, which is conducive to the popularization and use of auxiliary power distribution circuits.

1 to 5, in one embodiment, the switch control circuit 30 includes:

A release Q1, 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 turn off when it is turned on;

A tripper driving circuit, the tripper driving circuit is electrically connected to the tripper Q1, the controlled terminal of the tripper driving circuit is connected to the control terminal of the sampling control circuit 20, the tripping The switch drive circuit is used to control the release Q1 to turn on when receiving the control signal, so as to control the switch circuit 10 to turn off.

In this embodiment, the tripper Q1 is set in linkage with the switch circuit 10. The tripper Q1 is a device for remote control and opening. The button Q1 can drive the switch circuit 10 to turn off, so that the power input end and the power output end are disconnected from the circuit. The acquisition control circuit detects the input voltage, and controls the release drive circuit to work when the input voltage is overvoltage or high-order harmonics are present, so as to control the conduction of the release Q1, and then drive the switch circuit 10 to turn off, thereby disconnecting the power input The electrical connection between the terminal and the output terminal of the power supply realizes power-off protection.

Optionally, the release drive circuit includes a first electric fuse F1, a second electric fuse F2 and a relay K1, the first end of the release Q1 is connected to the output end of the relay K1, so The input end of the relay K1 is connected to the first end of the first electric fuse F1, the second end of the first electric fuse F1 is connected to the secondary winding of the transformer T1, and the first end of the release Q1 The two ends are connected to the first end of the second electric fuse F2, the second end of the second electric fuse F2 is connected to the secondary winding of the transformer T1, and the controlled end of the relay K1 is connected to the sampling control circuit connection;

Alternatively, the tripper driving circuit includes a first electric fuse F1, a second electric fuse F2, a relay K1 and a rectification and filtering component PE, the first terminal of the tripper Q1 is connected to the output terminal of the relay K1 The input end of the relay K1 is connected to the positive output end of the rectification filter component PE, the first input end of the rectification filter component PE is connected to the first end of the first electric fuse F1, and the The second end of the first electric fuse F1 is connected to the secondary winding of the transformer T1, the second end of the release Q1 is connected to the negative output end of the rectification and filtering component PE, and the second terminal of the rectification and filtering component PE is connected. The two input ends are connected to the first end of the second electric fuse F2, the second end of the second electric fuse F2 is connected to the secondary winding of the transformer T1, and the controlled end of the relay K1 is connected to the Sampling control circuit connection.

Referring to Fig. 3, Fig. 3 is a schematic diagram of the circuit structure of an implementation of the release drive circuit. The release drive circuit in the figure is composed of a first electric fuse F1, a second electric fuse F2 and a relay K1. The release Q1 The two ends of the circuit breaker are connected to the secondary winding of the transformer T1 through the electric fuse and the relay K1, and the voltage output by the transformer T1 provides the power supply for the release Q1 when it is turned on. At this time, the release Q1 is powered by the alternating current. When the control circuit detects that the input voltage is overvoltage or there is a high-order harmonic, the control circuit controls the relay K1 to be turned on and closed, so that the release Q1 is electrically turned on, so that the switch circuit 10 is turned off to realize power-off protection . It can be understood that the power source of the trip unit Q1 is output from the transformer T1, and the direct use of the power output of the transformer T1 can reduce the setting of additional power supply, thereby reducing the cost and size of the equipment.

Referring to Fig. 4, Fig. 4 is a schematic diagram of the circuit structure of an implementation of the release drive circuit. The release drive circuit in the figure is composed of the first electric fuse F1, the second electric fuse F2, the relay K1 and the rectification filter component PE , the two ends of the release Q1 are connected to the rectification and filter component PE through the capacitor wire and the relay K1, and the rectification and filter component PE is used to change the alternating current output by the secondary winding into a direct current output for the release Q1 when it is turned on. Power supply, at this time, the release Q1 is powered by direct current. When the control circuit detects that the input voltage is overvoltage or there is a high-order harmonic, the control circuit controls the relay K1 to be turned on and closed, so that the release Q1 is electrically turned on, so that the switch circuit 10 is turned off to realize power-off protection . It can be understood that the power source of the trip unit Q1 is output from the transformer T1, and the direct use of the power output of the transformer T1 can reduce the setting of additional power supply, thereby reducing the cost and size of the equipment. It can be understood that the difference between the above two release drive circuits is that the power supply of the release Q1 is DC or AC. Therefore, in practical applications, the , select the corresponding circuit topology to realize the power-off protection function in the utility model.

The utility model also proposes an auxiliary power distribution circuit, which includes a transformer T1, a slow start circuit, a power supply circuit and the above-mentioned power distribution control switch circuit;

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

The specific structure of the power distribution control switch circuit refers to the above-mentioned embodiments. Since this auxiliary power distribution circuit adopts all the technical solutions of all the above-mentioned embodiments, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments. Herein I won't repeat them one by one.

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

The auxiliary power distribution circuit also includes:

An external power supply switch circuit 10, the input terminal of the external power supply switch circuit 10 is connected to the external power supply output terminal of the power distribution control switch circuit, and the output terminal of the external power supply switch circuit 10 is connected to the primary winding of the transformer T1 connected, the external power supply switch circuit 10 is used to control the external power supply output end of the power distribution control switch circuit to be electrically connected to the primary winding of the transformer T1 when it is turned on;

An internal power supply switch circuit 10, the input terminal of the internal power supply switch circuit 10 is connected to the internal power supply output terminal of the power distribution control switch circuit, and the output terminal of the internal power supply switch circuit 10 is connected to the primary winding of the transformer T1 The internal power supply switch circuit 10 is used to control the internal power supply output end of the power distribution control switch circuit to be electrically connected to the primary winding of the transformer T1 when it is turned on.

Referring to Fig. 5, Fig. 5 is a schematic diagram of the circuit structure of an embodiment of the auxiliary power distribution circuit. There are six power input terminals and power output terminals in the figure, three of which are used to connect to the power grid, and the other three input terminals It is used to connect to the AC power supply equipment, and the six output terminals are combined in pairs, and the two output terminals are connected to the primary winding of a three-phase transformer T1. The acquisition control circuit detects the input voltage, and controls the switch circuit 10 to turn off when the input voltage is overvoltage or high-order harmonic exists, so as to disconnect the electrical connection between the power grid and the transformer T1, and realize power-off protection. In addition, an external power supply switch circuit 10 is provided between the primary winding of the transformer T1 and the output terminal of the external power supply, and an internal power supply switch circuit 10 is provided between the primary winding of the transformer and the output terminal of the internal power supply. The power supply switch circuit 10 and the internal power supply switch circuit 10 can be realized by mechanical switches, and the user can control the conduction or shutdown of the external power supply switch circuit 10 and the internal power supply switch circuit 10 according to the actual application scenario, so as to realize the internal and external power supply of the system switch. For example, when the power grid fails, the user can turn off the internal power supply switch circuit 10 and control the external power supply switch circuit 10 to conduct, 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 double protected. For example, when the power distribution control switch circuit fails, the user can manually control the external power supply switch circuit 10 and the internal power supply switch circuit. The circuit 10 is turned off, so that troubleshooting can be performed after the system is powered off, which improves the stability and safety of the auxiliary power distribution circuit.

The above is only a preferred embodiment of the utility model, and therefore does not limit the patent scope of the utility model. Under the inventive concept of the utility model, the equivalent structural transformation made by using the specification of the utility model and the contents of the accompanying drawings, or Direct/indirect application in other related technical fields is included in the patent protection scope of the present 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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