Power switching system

Abstract

The utility model provides a power supply switching system. The system comprises a first power supply, a second power supply, and a switching circuit and a change-over switch corresponding to each power supply, each power supply is connected with a load through a corresponding change-over switch; the first switch of each switching circuit responds to the first coil of the switching circuit, and the second switch and the third switch respond to the second coil of the other switching circuit; the change-over switch corresponding to each power supply responds to the second coil of the switching circuit corresponding to the power supply; a first contact and a second contact of a change-over switch in each switching circuit are connected with a live wire of a corresponding power supply, a third contact is connected with one end of a second coil through a second switch, a fourth contact is connected with one end of a first coil through a third switch, and the other end of the first coil is connected with a third switch. The other end of the first coil and the other end of the second coil are connected with zero lines of corresponding power supplies. The system can reduce the cost.

Description

Technical Field

[0001] The present application relates to power supply technology, and in particular to a power switching system. Background Art

[0002] In order to ensure the reliable operation of electrical equipment, multiple completely independent power supply circuits are usually used for power supply. When one power supply fails, another power supply is switched to supply power to the load.

[0003] In the prior art, power switching is often achieved through a single-chip microcomputer, which has the problem of high cost. Utility Model Content

[0004] The present application provides a power switching system for automatically and accurately performing power switching and reducing costs.

[0005] On the one hand, the present application provides a power switching system, comprising: a first power supply, a second power supply, and a switching circuit and a switching switch corresponding to each power supply; each power supply is connected to one end of the corresponding switching switch, and the other end of the switching switch is connected to a load;

[0006] Each switching circuit includes a first coil, a second coil, a first switch, a second switch, a third switch and a transfer switch; wherein the first switch of each switching circuit is turned on in response to the first coil of the switching circuit being energized, and is turned off when it is not energized; the second switch and the third switch of each switching circuit are turned off in response to the second coil of another switching circuit being energized, and are turned on when it is not energized; the transfer switch corresponding to each power supply is turned on in response to the second coil of the switching circuit corresponding to the power supply being energized, and is turned off when it is not energized;

[0007] The conversion switch has a first contact, a second contact, a third contact and a fourth contact; the first contact and the second contact of the conversion switch of each switching circuit are connected to the live wire of the power supply corresponding to the switching circuit; the third contact of the conversion switch of each switching circuit is connected to one end of the second switch of the switching circuit, the other end of the second switch is connected to one end of the second coil of the switching circuit, and the other end of the second coil is connected to the neutral wire of the power supply corresponding to the switching circuit; the fourth contact of the conversion switch of each switching circuit is connected to one end of the first switch of the switching circuit and one end of the third switch, the other end of the first switch is connected to the other end of the second switch of the switching circuit, the other end of the third switch is connected to one end of the first coil of the switching circuit, and the other end of the first coil is connected to the other end of the second coil in the switching circuit.

[0008] Optionally, the conversion switch of the switching circuit corresponding to the first power supply and the conversion switch of the switching circuit corresponding to the second power supply are the same conversion switch.

[0009] Optionally, each switching circuit further includes: a fourth switch and an indicator light;

[0010] One end of the fourth switch is connected to the second contact of the conversion switch of the switching circuit, the other end of the fourth switch is connected to one end of the indicator light of the switching circuit, and the other end of the indicator light is connected to the neutral line of the power supply corresponding to the switching circuit; wherein the fourth switch of each switching circuit is turned on when the second coil of the switching circuit is energized, and is disconnected when it is not energized.

[0011] Optionally, both the first power supply and the second power supply are three-phase power supplies, and the switching circuit corresponding to each power supply is connected to any live wire of the three-phase live wires of the power supply.

[0012] Optionally, the power switching system further includes: a phase loss detection circuit corresponding to each power supply;

[0013] One end of the phase loss detection circuit is connected to the live wire of the corresponding power supply, and the other end is connected to the corresponding switching circuit. It is used to cut off the connection between the power supply and the switching circuit corresponding to the power supply when the corresponding power supply loses phase, so that the second coil in the switching circuit corresponding to the power supply is not energized.

[0014] Optionally, the phase loss detection circuit comprises: a plurality of coils and a plurality of switches in one-to-one correspondence, wherein the plurality of switches correspond to the coils of the phase loss detection circuit in one-to-one correspondence;

[0015] Each coil of the phase loss detection circuit corresponds to two phases of the power supply corresponding to the phase loss detection circuit, different coils of the phase loss detection circuit correspond to different two phases of the power supply corresponding to the phase loss detection circuit, and both ends of each coil of the phase loss detection circuit are respectively connected to the live wires of the corresponding two phases of the corresponding power supply;

[0016] Each switch of the phase loss detection circuit is turned on when the corresponding coil in the phase loss detection circuit is energized, and is turned off when the coil is not energized; the switches of the phase loss detection circuit are connected in series to form a series structure, one end of the series structure is connected to any live wire of the power supply corresponding to the phase loss detection circuit, and the other end is connected to the first contact of the conversion switch in the switching circuit corresponding to the phase loss detection circuit.

[0017] Optionally, the power switching system further includes: a protection circuit corresponding to each power supply;

[0018] One end of the protection circuit is connected to the live wire of the corresponding power supply, and the other end is connected to one end of the switching switch of the corresponding power supply, which is used to disconnect when the corresponding power supply has overcurrent or overvoltage, so as to cut off the connection between the power supply and the load.

[0019] Optionally, the protection circuit comprises: a circuit breaker;

[0020] One end of the circuit breaker is connected to the live wire of the power supply corresponding to the protection circuit, and the other end is connected to one end of the switching switch of the power supply corresponding to the protection circuit.

[0021] The power switching system provided by the present application includes a first power supply, a second power supply, and a switching circuit and a switching switch corresponding to each power supply. Each power supply is connected to one end of the corresponding switching switch, and the other end of the switching switch is connected to the load. Each switching circuit includes a first coil, a second coil, a first switch, a second switch, a third switch and a conversion switch. The switching switch corresponding to each power supply is turned on when the second coil of the switching circuit corresponding to the power supply is energized, and is disconnected when it is not energized. The corresponding switching switch can be controlled by the switching circuit to turn on or off the connection between the corresponding power supply and the load, so as to switch the power supply; the first contact and the second contact of the conversion switch of each switching circuit are connected to the live wire of the power supply corresponding to the switching circuit; the third contact of the conversion switch of each switching circuit is connected to one end of the second switch of the switching circuit, the other end of the second switch is connected to one end of the second coil of the switching circuit, and the other end of the second coil is connected to the neutral wire of the power supply corresponding to the switching circuit; each switching circuit The fourth contact of the conversion switch of the circuit is connected to one end of the first switch and one end of the third switch of the switching circuit, the other end of the first switch is connected to the other end of the second switch of the switching circuit, the other end of the third switch is connected to one end of the first coil of the switching circuit, and the other end of the first coil is connected to the other end of the second coil of the switching circuit. The first switch of each switching circuit is turned on in response to the first coil of the switching circuit being energized, and is disconnected when it is not energized; the second switch and the third switch of each switching circuit are disconnected in response to the second coil of another switching circuit being energized, and are turned on when it is not energized. When the main power supply fails, the second coil of the switching circuit corresponding to the backup power supply is energized, so as to switch to the backup power supply in time and accurately to supply power to the load, which is beneficial to improving the reliability of the system; a variety of control modes are provided by the conversion switch, so that the switching of the main power supply can be realized, which is beneficial to increasing the flexibility of the system; in addition, the system is composed of pure hardware, has good automatic switching performance, effectively reduces costs, and is easy to install and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0023] Figure 1 exemplarily shows a structural schematic diagram of a power switching system provided in Embodiment 1 of the present application;

[0024] Figure 2exemplarily shows a structural schematic diagram of a phase loss detection circuit corresponding to the first power supply provided in Embodiment 1 of the present application;

[0025] Figure 3 exemplarily shows a structural schematic diagram of a phase loss detection circuit corresponding to the second power supply provided in Embodiment 1 of the present application;

[0026] Figure 4 The flowchart of the power switching method provided in the second embodiment of the present application is exemplified in FIG.

[0027] The above drawings have shown clear embodiments of the present application, which will be described in more detail later. These drawings and text descriptions are not intended to limit the scope of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0028] Here, exemplary embodiments are described in detail, and examples thereof are shown in the accompanying drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The implementations described in the following exemplary embodiments do not represent all implementations consistent with the present application.

[0029] The technical solution of the present application is illustrated below with specific embodiments. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described in detail in some embodiments.

[0030] In order to ensure the reliable operation of electrical equipment, multiple completely independent power supply circuits are usually used for power supply. When one power supply fails, another power supply is switched to supply power to the load.

[0031] In the prior art, power switching is often achieved through a single-chip microcomputer, which has the problem of high cost.

[0032] The power switching system provided in this application is intended to solve the above-mentioned technical problems.

[0033] The power switching system provided by the present application includes a first power supply, a second power supply, and a switching circuit and a switching switch corresponding to each power supply. Each power supply is connected to one end of the corresponding switching switch, and the other end of the switching switch is connected to the load. Each switching circuit includes a first coil, a second coil, a first switch, a second switch, a third switch and a conversion switch. The switching switch corresponding to each power supply is turned on when the second coil of the switching circuit corresponding to the power supply is energized, and is disconnected when it is not energized. The corresponding switching switch can be controlled by the switching circuit to turn on or off the connection between the corresponding power supply and the load, so as to switch the power supply; the first contact and the second contact of the conversion switch of each switching circuit are connected to the live wire of the power supply corresponding to the switching circuit; the third contact of the conversion switch of each switching circuit is connected to one end of the second switch of the switching circuit, the other end of the second switch is connected to one end of the second coil of the switching circuit, and the other end of the second coil is connected to the neutral wire of the power supply corresponding to the switching circuit; each switching circuit The fourth contact of the conversion switch is connected to one end of the first switch of the switching circuit and one end of the third switch, the other end of the first switch is connected to the other end of the second switch of the switching circuit, the other end of the third switch is connected to one end of the first coil of the switching circuit, and the other end of the first coil is connected to the other end of the second coil of the switching circuit. The first switch of each switching circuit is turned on in response to the first coil of the switching circuit being energized, and is disconnected when it is not energized; the second switch and the third switch of each switching circuit are disconnected in response to the second coil of another switching circuit being energized, and are turned on when it is not energized. When the main power supply fails, the second coil of the switching circuit corresponding to the backup power supply is energized, so as to switch to the backup power supply in a timely and accurate manner to supply power to the load, which is beneficial to improving the reliability of the system, and providing multiple control modes through the conversion switch, which can realize the switching of the main power supply, which is beneficial to increasing the flexibility of the system; in addition, the system is composed of pure hardware, has good automatic switching performance, effectively reduces costs, and is easy to install and use.

[0034] Embodiment 1

[0035] Figure 1 A schematic diagram of the structure of a power switching system provided in an embodiment of the present application is shown in FIG. Figure 1 As shown, the power switching system provided in this embodiment may include: a first power supply, a second power supply, and a switching circuit corresponding to each power supply (the figure takes two power supplies as an example, the first switching circuit is the switching circuit corresponding to the first power supply, and the second switching circuit is the switching circuit corresponding to the second power supply) and a switching switch; each power supply is connected to one end of the corresponding switching switch, and the other end of the switching switch is connected to the load;

[0036] Each switching circuit includes a first coil, a second coil, a first switch, a second switch, a third switch and a transfer switch; wherein the first switch of each switching circuit is turned on in response to the first coil of the switching circuit being energized, and is turned off when it is not energized; the second switch and the third switch of each switching circuit are turned off in response to the second coil of another switching circuit being energized, and are turned on when it is not energized; the transfer switch corresponding to each power supply is turned on in response to the second coil of the switching circuit corresponding to the power supply being energized, and is turned off when it is not energized;

[0037] The conversion switch has a first contact, a second contact, a third contact and a fourth contact; the first contact and the second contact of the conversion switch of each switching circuit are connected to the live wire of the power supply corresponding to the switching circuit; the third contact of the conversion switch of each switching circuit is connected to one end of the second switch of the switching circuit, the other end of the second switch is connected to one end of the second coil of the switching circuit, and the other end of the second coil is connected to the neutral wire of the power supply corresponding to the switching circuit; the fourth contact of the conversion switch of each switching circuit is connected to one end of the first switch of the switching circuit and one end of the third switch, the other end of the first switch is connected to the other end of the second switch of the switching circuit, the other end of the third switch is connected to one end of the first coil of the switching circuit, and the other end of the first coil is connected to the other end of the second coil of the switching circuit.

[0038] Specifically, the power switching system includes: a first power supply, a second power supply, and a switching circuit and a switching switch corresponding to each power supply; each power supply is connected to one end of the corresponding switching switch, and the other end of the switching switch is connected to the load; the switching switch is used to turn on or off the connection between the corresponding power supply and the load; the switching circuit is used to control the switching switch connected to the corresponding power supply to turn on or off. In practical applications, the power switching system can include multiple power supplies, and the type and quantity of the power supply can be selected according to the actual production needs, which is not limited here.

[0039] Combination Figure 1 , taking the case of two power supplies as an example, the first power supply corresponds to the first switching circuit and the first switching switch KM1-1, the first power supply is connected to one end of the first switching switch KM1-1, and the other end of the first switching switch KM1-1 is connected to the load; the first switching switch KM1-1 is used to turn on or off the connection between the first power supply and the load, and the first switching circuit is used to control the first switching switch KM1-1. The second power supply corresponds to the second switching circuit and the second switching switch KM2-1, the second power supply is connected to one end of the second switching switch KM2-1, and the other end of the second switching switch KM2-1 is connected to the load; the second switching switch KM2-1 is used to turn on or off the connection between the second power supply and the load, and the second switching circuit is used to control the second switching switch KM2-1.

[0040] In practical applications, there may be multiple types of first power supply and second power supply. In one example, the first power supply and the second power supply are both three-phase power supplies, and the switching circuit corresponding to each power supply is connected to any live wire of the three-phase live wire of the power supply. Figure 1 As shown, the first power supply includes three-phase live wires A1, B1, C1 and neutral wire N1, and the second power supply includes three-phase live wires A2, B2, C2 and neutral wire N2. The switching circuit corresponding to each power supply is connected to any position of any live wire of the three-phase live wire of the power supply. Figure 1 For example, each switching circuit is connected to the C-phase live wire of the corresponding power supply, wherein the first switching circuit is connected to the C10 position of the C-phase live wire of the first power supply, and the second switching circuit is connected to the C20 position of the C-phase live wire of the second power supply. Corresponding to the first power supply and the second power supply, the load has multiple ports such as port L1, port L2, port L3, port N, and port L1, port L2, port L3, and port N correspond to the three-phase live wire and neutral wire of the first power supply and the second power supply, respectively.

[0041] Each switching circuit includes a first coil, a second coil, a first switch, a second switch, a third switch and a conversion switch. The first switch of each switching circuit is a normally open switch, which is turned on in response to the first coil of the switching circuit being energized, and is disconnected when it is not energized. The second switch and the third switch of each switching circuit are normally closed switches, which are disconnected in response to the second coil of another switching circuit being energized, and are turned on when it is not energized. The switching switch corresponding to each power supply is a normally open switch, which is turned on in response to the second coil of the switching circuit corresponding to the power supply being energized, and is disconnected when it is not energized. In practical applications, the first switch of each switching circuit and the first coil of the switching circuit can be realized by a time relay, the first switch of each switching circuit corresponds to the normally open contact of the time relay, and the first coil of the switching circuit corresponds to the coil of the time relay; the switching switch corresponding to each power supply, the second coil of the switching circuit corresponding to the power supply, and the second switch and the third switch of another switching circuit can be realized by an AC contactor, the switching switch corresponding to each power supply corresponds to the main normally open contact of the AC contactor, the second coil of the switching circuit corresponding to the power supply corresponds to the coil of the AC contactor, and the second switch and the third switch of another switching circuit correspond to two sets of normally closed contacts of the AC contactor. The conversion switch has a first contact, a second contact, a third contact and a fourth contact. The first contact and the second contact of the conversion switch of each switching circuit are connected to the live wire of the power supply corresponding to the switching circuit. The third contact of the conversion switch of each switching circuit is connected to one end of the second switch of the switching circuit, the other end of the second switch is connected to one end of the second coil of the switching circuit, and the other end of the second coil is connected to the neutral wire of the power supply corresponding to the switching circuit; the fourth contact of the conversion switch of each switching circuit is connected to one end of the first switch of the switching circuit and one end of the third switch, the other end of the first switch is connected to the other end of the second switch of the switching circuit, the other end of the third switch is connected to one end of the first coil of the switching circuit, and the other end of the first coil is connected to the other end of the second coil of the switching circuit.

[0042] Specifically, if Figure 1As shown, the first switching circuit includes a first coil KT1, a second coil KM1, a first switch KT1-1, a second switch KM2-2, a third switch KM2-3 and a conversion switch SAC1 of the first switching circuit. The conversion switch SAC1 includes a first contact Z1 of the conversion switch SAC1, a second contact Z2 of the conversion switch SAC1, a third contact Z3 of the conversion switch SAC1, and a fourth contact Z4 of the conversion switch SAC1. The first contact Z1 and the second contact Z2 of the conversion switch SAC1 are connected to the C10 position of the C phase live wire of the first power supply. The third contact Z3 of the conversion switch SAC1 is connected to one end of the second switch KM2-2, the other end of the second switch KM2-2 is connected to one end of the second coil KM1, and the other end of the second coil KM1 is connected to the N10 position of the neutral line of the first power supply. The fourth contact Z4 of the conversion switch SAC1 is connected to one end of the first switch KT1-1 and one end of the third switch KM2-3, the other end of the first switch KT1-1 is connected to the other end of the second switch KM2-2, the other end of the third switch KM2-3 is connected to one end of the first coil KT1, and the other end of the first coil KT1 is connected to the other end of the second coil KM1.

[0043] The second switching circuit includes a first coil KT2, a second coil KM2, a first switch KT2-1, a second switch KM1-2, a third switch KM1-3 and a transfer switch SAC2. The transfer switch SAC2 includes a first contact Z5 of the transfer switch SAC2, a second contact Z6 of the transfer switch SAC2, a third contact Z7 of the transfer switch SAC2, and a fourth contact Z8 of the transfer switch SAC2. The specific structure of the second switching circuit refers to the above-mentioned first switching circuit, which will not be repeated here.

[0044] The first switching switch KM1-1 responds to the second coil KM1 of the first switching circuit, and is turned on when the second coil KM1 of the first switching circuit is energized, and is turned off when the second coil KM1 of the first switching circuit is not energized. The first switch KT1-1 of the first switching circuit responds to the first coil KT1 of the first switching circuit, and is turned on when the first coil KT1 of the first switching circuit is energized, and is turned off when the first coil KT1 of the first switching circuit is not energized. The second switch KM2-2 and the third switch KM2-3 of the first switching circuit both respond to the second coil KM2 of the second switching circuit, and are turned off when the second coil KM2 of the second switching circuit is energized, and are turned on when the second coil KM2 of the second switching circuit is not energized.

[0045] The second switching switch KM2-1 responds to the second coil KM2 of the second switching circuit, is turned on when the second coil KM2 of the second switching circuit is energized, and is turned off when the second coil KM2 of the second switching circuit is not energized. The first switch KT2-1 of the second switching circuit responds to the first coil KT2 of the second switching circuit, is turned on when the first coil KT2 of the second switching circuit is energized, and is turned off when the first coil KT2 of the second switching circuit is not energized. The second switch KM1-2 and the third switch KM1-3 of the second switching circuit both respond to the second coil KM1 of the first switching circuit, are turned off when the second coil KM1 of the first switching circuit is energized, and are turned on when the second coil KM1 of the first switching circuit is not energized.

[0046] In actual applications, the first coil KT1 of the first switching circuit and the first switch KT1-1 of the first switching circuit are realized by a time relay, the first coil KT2 of the second switching circuit and the first switch KT2-1 of the second switching circuit are realized by another time relay, the first switching switch KM1-1, the second coil KM1 of the first switching circuit, and the second switch KM1-2 and the third switch KM1-3 of the second switching circuit are realized by an AC contactor, and the second switching switch KM2-1, the second coil KM2 of the second switching circuit, and the second switch KM2-2 and the third switch KM2-3 of the first switching circuit are realized by another AC contactor.

[0047] In this example, the corresponding switching switch is controlled by the switching circuit to connect or disconnect the corresponding power supply and the load, thereby switching the power supply. When the main power supply fails, the second coil of the switching circuit corresponding to the backup power supply is energized, thereby timely and accurately switching to the backup power supply to supply power to the load, which is beneficial to improving the reliability of the system. The conversion switch provides a variety of control modes, which can realize the switching of the main power supply, and is beneficial to increasing the flexibility of the system. In addition, the system is composed of pure hardware, has good automatic switching performance, effectively reduces costs, and is easy to install and use.

[0048] Based on the four contacts of the conversion switch, multiple working modes of the power switching system can be realized. In one example, in the first mode, in the switching circuit corresponding to the first power source, the second contact of the conversion switch is connected to the third contact, and the first contact is disconnected from the fourth contact; in the switching circuit corresponding to the second power source, the second contact of the conversion switch is disconnected from the third contact, and the first contact is connected to the fourth contact;

[0049] In the second mode, in the switching circuit corresponding to the first power supply, the second contact of the conversion switch is disconnected from the third contact, and the first contact is connected to the fourth contact; in the switching circuit corresponding to the second power supply, the second contact of the conversion switch is connected to the third contact, and the first contact is disconnected from the fourth contact.

[0050] Specifically, the power switching system may include a first mode, a second mode and a third mode, wherein in the first mode, the first power supply is a main power supply and the second power supply is a backup power supply; in the second mode, the first power supply is a backup power supply and the second power supply is a main power supply; in the third mode, the power switching system stops supplying power.

[0051] like Figure 1 As shown, in the first mode, in the first switching circuit corresponding to the first power supply, the second contact Z2 of the conversion switch SAC1 is connected to the third contact Z3, and the first contact Z1 is disconnected from the fourth contact Z4; in the second switching circuit corresponding to the second power supply, the second contact Z6 of the conversion switch SAC2 is disconnected from the third contact Z7, and the first contact Z5 is connected to the fourth contact Z8. When the first power supply is normal, the second switch KM2-2 of the first switching circuit is closed, the second coil KM1 of the first switching circuit is energized, the first switching switch KM1-1 is closed, and the first power supply supplies power to the load; the third switch KM1-3 of the second switching circuit is disconnected, the first coil KT2 of the second switching circuit is not energized, the first switch KT2-1 of the second switching circuit is disconnected, the second coil KM2 of the second switching circuit is not energized, the second switching switch KM2-1 is disconnected, and the second switch KM2-2 of the first switching circuit remains closed. When the first power supply fails, the second coil KM1 of the first switching circuit is not energized, the third switch KM1-3 of the second switching circuit is closed, the first coil KT2 of the second switching circuit is energized, the first switch KT2-1 of the second switching circuit is closed, the second coil KM2 of the second switching circuit is energized, and the second switching switch KM2-1 is closed, thereby switching to the second power supply to supply power to the load.

[0052] In the second mode, in the first switching circuit corresponding to the first power supply, the second contact Z2 of the conversion switch SAC1 is disconnected from the third contact Z3, and the first contact Z1 is connected to the fourth contact Z4; in the second switching circuit corresponding to the second power supply, the second contact Z6 of the conversion switch SAC2 is connected to the third contact Z7, and the first contact Z5 is disconnected from the fourth contact Z8. When the second power supply is normal, the second switch KM1-2 of the second switching circuit is closed, the second coil KM2 of the second switching circuit is energized, the second switching switch KM2-1 is closed, and the second power supply supplies power to the load; the third switch KM2-3 of the first switching circuit is disconnected, the first coil KT1 of the first switching circuit is not energized, the first switch KT1-1 of the first switching circuit is disconnected, the second coil KM1 of the first switching circuit is not energized, the first switching switch KM1-1 is disconnected, and the second switch KM1-2 of the second switching circuit remains closed. When the second power supply fails, the second coil KM2 of the second switching circuit is not energized, the third switch KM2-3 of the first switching circuit is closed, the first coil KT1 of the first switching circuit is energized, the first switch KT1-1 of the first switching circuit is closed, the second coil KM2 of the first switching circuit is energized, and the second switching switch KM2-1 is closed, thereby switching to the second power supply to power the load.

[0053] In the third mode, in the first switching circuit corresponding to the first power supply, the second contact Z2 and the third contact Z3 of the conversion switch SAC1 are disconnected, and the first contact Z1 and the fourth contact Z4 are disconnected; in the second switching circuit corresponding to the second power supply, the second contact Z6 and the third contact Z7 of the conversion switch SAC2 are disconnected, and the first contact Z5 and the fourth contact Z8 are disconnected.

[0054] In this example, based on the conversion switch in each switching circuit, the main power supply and the backup power supply can be replaced, thereby providing a variety of operating modes for the power switching system, which is conducive to increasing the flexibility of the system; in addition, this system is composed of pure hardware, with good automatic switching performance while effectively reducing costs and is easy to install and use.

[0055] In order to efficiently control the conversion switch, in one example, the conversion switch of the switching circuit corresponding to the first power source and the conversion switch of the switching circuit corresponding to the second power source are the same conversion switch.

[0056] Specifically, the conversion switch of the switching circuit corresponding to the first power supply and the conversion switch of the switching circuit corresponding to the second power supply are the same conversion switch. By switching the mode of the conversion switch once, the connection between the first contact and the third contact of the first switching circuit, the connection between the second contact and the fourth contact, and the connection between the first contact and the third contact of the second switching circuit, and the connection between the second contact and the fourth contact can be controlled, which is conducive to improving the convenience of operation.

[0057] When the main power supply fails, the power switching system can automatically switch to the backup power supply to supply power to the load. To intuitively indicate the current power supply, in one example, each switching circuit further includes: a fourth switch and an indicator light;

[0058] One end of the fourth switch is connected to the second contact of the conversion switch of the switching circuit, the other end of the fourth switch is connected to one end of the indicator light of the switching circuit, and the other end of the indicator light is connected to the neutral line of the power supply corresponding to the switching circuit; wherein the fourth switch of each switching circuit is turned on when the second coil of the switching circuit is energized, and is disconnected when it is not energized.

[0059] Specifically, in each switching circuit, one end of the fourth switch is connected to the second contact of the conversion switch of the switching circuit, the other end of the fourth switch is connected to one end of the indicator light of the switching circuit, and the other end of the indicator light is connected to the neutral line of the power supply corresponding to the switching circuit. The fourth switch is a normally open switch, which is turned on when the second coil of the switching circuit is energized, and the indicator light is on, thereby indicating that the power supply corresponding to the switching circuit is supplying power to the load at this time.

[0060] like Figure 1 As shown, the first switching circuit also includes a fourth switch KM1-4 of the first switching circuit and an indicator light HG1, one end of the fourth switch KM1-4 of the first switching circuit is connected to the second contact Z2 of the first switching circuit, the other end of the fourth switch KM1-4 of the first switching circuit is connected to one end of the indicator light HG1 of the first switching circuit, and the other end of the indicator light HG1 of the first switching circuit is connected to the position N10 of the neutral line of the first power supply. The second switching circuit also includes a fourth switch KM2-4 of the second switching circuit and an indicator light HG2, one end of the fourth switch KM2-4 of the second switching circuit is connected to the second contact Z6 of the second switching circuit, the other end of the fourth switch KM1-4 of the second switching circuit is connected to one end of the indicator light HG2 of the second switching circuit, and the other end of the indicator light HG2 of the second switching circuit is connected to the neutral line N20 of the second power supply. Exemplarily, in the first mode, when the first power supply is normal, the second coil KM1 of the first switching circuit is energized, the fourth switch KM1-4 of the first switching circuit is closed, and the indicator light HG1 of the first switching circuit is illuminated; the second coil KM2 of the second switching circuit is not energized, the fourth switch KM2-4 of the second switching circuit is disconnected, and the indicator light HG2 of the second switching circuit is not illuminated. When the first power supply fails, the indicator light HG1 of the first switching circuit is not illuminated; the second coil KM2 of the second switching circuit is energized, the fourth switch KM2-4 of the second switching circuit is closed, and the indicator light HG2 of the second switching circuit is illuminated. The other modes are similar and will not be described in detail here.

[0061] In this example, the fourth switch and indicator light based on each switching circuit can accurately indicate the power source currently supplying power to the load, and enable the staff to promptly perform maintenance and processing when a power failure occurs, thereby improving the reliability of the system.

[0062] In order to deal with the problem of power phase loss, one or more phases of a multi-phase power supply may fail or be interrupted. In one example, the power switching system further includes: a phase loss detection circuit corresponding to each power supply;

[0063] One end of the phase loss detection circuit is connected to the live wire of the corresponding power supply, and the other end is connected to the corresponding switching circuit. It is used to cut off the connection between the power supply and the switching circuit corresponding to the power supply when a phase loss occurs in the corresponding power supply, so that the second coil in the switching circuit corresponding to the power supply is not energized.

[0064] Specifically, a corresponding phase loss detection circuit is arranged between the live wire of each power supply and the switching circuit corresponding to the power supply. The phase loss detection circuit is used to cut off the connection between the power supply and the switching circuit corresponding to the power supply when the corresponding power supply has a phase loss. In combination with the above example, the second coil in the switching circuit corresponding to the power supply is not energized, the switching switch corresponding to the power supply is disconnected, the second coil in the other switching circuit is energized, and the switching switch corresponding to the other power supply is closed, thereby switching to the other power supply to supply power to the load.

[0065] In this example, a phase loss detection circuit is used to detect the phase loss of the power supply. When the corresponding power supply loses a phase, the connection between the power supply and the switching circuit corresponding to the power supply is cut off, thereby achieving switching of the power supply, which is beneficial to improving the reliability of power supply.

[0066] The specific structure of the phase loss detection circuit can be various, which is not limited here. In one example, the phase loss detection circuit includes: a plurality of coils and a plurality of switches, and the plurality of switches correspond to the coils of the phase loss detection circuit one by one;

[0067] Each coil of the phase loss detection circuit corresponds to two phases of the power supply corresponding to the phase loss detection circuit, different coils of the phase loss detection circuit correspond to different two phases of the power supply corresponding to the phase loss detection circuit, and one end of each coil of the phase loss detection circuit is respectively connected to the live wires of the corresponding two phases of the corresponding power supply;

[0068] Each switch of the phase loss detection circuit is turned on when the corresponding coil in the phase loss detection circuit is energized, and is turned off when the coil is not energized; the switches of the phase loss detection circuit are connected in series to form a series structure, one end of the series structure is connected to any live wire of the power supply corresponding to the phase loss detection circuit, and the other end is connected to the first contact of the conversion switch in the switching circuit corresponding to the phase loss detection circuit.

[0069] Specifically, the phase loss detection circuit includes: a plurality of coils and a plurality of switches, wherein the number of coils is the same as the number of phases of the power supply, and the plurality of switches correspond to the plurality of coils one by one. Each coil of the phase loss detection circuit corresponds to two phases of the power supply corresponding to the phase loss detection circuit, and different coils of the phase loss detection circuit correspond to different two phases of the power supply corresponding to the phase loss detection circuit, and one end and the other end of each coil are respectively connected to the live wires of the corresponding two phases of the corresponding power supply. Taking a three-phase power supply as an example, the phase loss detection circuit corresponding to each power supply includes three coils and three switches, and any two phases of each power supply correspond to a coil in the phase loss detection circuit corresponding to the power supply, and the two ends of each coil are respectively connected to the corresponding two-phase live wires. Each switch of the phase loss detection circuit is turned on in response to the corresponding coil in the phase loss detection circuit being energized, and is turned off when it is not energized. In practical applications, each coil of the phase loss detection circuit and its corresponding switch can be implemented by an intermediate relay, the coil corresponds to the coil of the intermediate relay, and the switch corresponds to the normally open contact of the intermediate relay. The switches of the phase loss detection circuit are connected in series to form a series structure, one end of which is connected to any live wire of the power supply corresponding to the phase loss detection circuit, and the other end is connected to the first contact of the conversion switch in the switching circuit corresponding to the phase loss detection circuit.

[0070] Figure 2 A schematic diagram of a phase loss detection circuit corresponding to a first power supply provided in an embodiment of the present application is shown in FIG. Figure 2As shown, the phase loss detection circuit corresponding to the first power supply includes a third coil KA1, a fourth coil KA2, a fifth coil KA3, a fifth switch KA1-1, a sixth switch KA2-1 and a seventh switch KA3-1, wherein the third coil KA1 corresponds to the fifth switch KA1-1, the fifth switch KA1-1 is turned on when the third coil KA1 is energized, and is disconnected when it is not energized; the fourth coil KA2 corresponds to the sixth switch KA2-1, the sixth switch KA2-1 is turned on when the fourth coil KA2 is energized, and is disconnected when it is not energized; the fifth coil KA3 corresponds to the seventh switch KA3-1, the seventh switch KA3-1 is turned on when the fifth coil KA3 is energized, and is disconnected when it is not energized. One end of the third coil KA1 is connected to the A10 position of the A phase live wire of the first power supply, and the other end of the third coil KA1 is connected to the B10 position of the B phase live wire of the first power supply; one end of the fourth coil KA2 is connected to the A10 position of the A phase live wire of the first power supply, and the other end of the fourth coil KA2 is connected to the C10 position of the C phase live wire of the first power supply; one end of the fifth coil KA3 is connected to the B10 position of the B phase live wire of the first power supply, and the other end of the fifth coil KA3 is connected to the C10 position of the C phase live wire of the first power supply. One end of the fifth switch KA1-1 is connected to the C10 position of the C phase live wire of the first power supply, and the other end of the fifth switch KA1-1 is connected to one end of the sixth switch KA2-1, and the other end of the sixth switch KA2-1 is connected to one end of the seventh switch KA3-1, and the other end of the seventh switch KA3-1 is connected to one end of the first switching circuit, and the other end of the first switching circuit is connected to the N10 position of the neutral line of the first power supply.

[0071] Figure 3 A schematic diagram of a phase loss detection circuit corresponding to a second power supply provided in an embodiment of the present application is shown in FIG. Figure 3 As shown, the phase loss detection circuit corresponding to the second power supply includes a sixth coil KA4, a seventh coil KA5, an eighth coil KA6, an eighth switch KA4-1, a ninth switch KA5-1 and a tenth switch KA6-1. The structure of the phase loss detection circuit corresponding to the second power supply is similar to that of the phase loss detection circuit corresponding to the first power supply, which will not be repeated here.

[0072] In this example, by setting multiple coils between any two-phase live wires of the power supply, the corresponding coils shall not be energized when a phase loss occurs, so that the switches corresponding to the coils are disconnected, cutting off the connection between the power supply and the corresponding switching circuit, thereby achieving power switching, effectively realizing phase loss detection and protection, and improving system reliability.

[0073] In order to further improve the safety and reliability of the system, in one example, the power switching system further includes: a protection circuit corresponding to each power supply;

[0074] One end of the protection circuit is connected to the live wire of the corresponding power supply, and the other end is connected to one end of the switching switch of the corresponding power supply, which is used to disconnect when the corresponding power supply has overcurrent or overvoltage, so as to cut off the connection between the power supply and the load.

[0075] Specifically, one end of each protection circuit is connected to the live wire and the neutral wire of the corresponding power supply, and the other end is connected to the switching circuit of the corresponding power supply and one end of the switching switch, which is used to disconnect when the corresponding power supply has overcurrent or overvoltage, so as to cut off the connection between the power supply and the load.

[0076] In this example, by setting a protection circuit between the power supply and the corresponding switching switch, the connection between the power supply and the load can be automatically disconnected when overcurrent or overvoltage occurs, thereby effectively performing overcurrent and overvoltage protection and improving system reliability.

[0077] The specific structure of the protection circuit can be various. In one example, the protection circuit includes: a circuit breaker;

[0078] One end of the circuit breaker is connected to the live wire of the power supply corresponding to the protection circuit, and the other end is connected to one end of the switching switch of the power supply corresponding to the protection circuit.

[0079] Specifically, Figure 1 As shown, the protection circuit corresponding to the first power supply includes a circuit breaker QF1, one end of the circuit breaker QF1 corresponding to the first power supply is connected to the live wires and the neutral wire of each phase of the first power supply, and the other end is connected to the first switching circuit and the switching switch KM1-1 corresponding to the first power supply; the protection circuit corresponding to the second power supply includes a circuit breaker QF2, one end of the circuit breaker QF2 corresponding to the second power supply is connected to the live wires and the neutral wire of each phase of the second power supply, and the other end is connected to the second switching circuit and the switching switch KM2-1 corresponding to the second power supply.

[0080] In this example, by setting a circuit breaker between the power supply and the corresponding switching switch, the connection between the power supply and the load can be automatically disconnected when overcurrent or overvoltage occurs, thereby effectively performing overcurrent and overvoltage protection and improving system reliability.

[0081] The power switching system provided in this embodiment includes a first power supply, a second power supply, and a switching circuit and a switching switch corresponding to each power supply. Each power supply is connected to one end of the corresponding switching switch, and the other end of the switching switch is connected to the load. Each switching circuit includes a first coil, a second coil, a first switch, a second switch, a third switch and a conversion switch. The switching switch corresponding to each power supply is turned on when the second coil of the switching circuit corresponding to the power supply is energized, and is disconnected when it is not energized. The corresponding switching switch can be controlled by the switching circuit to turn on or off the connection between the corresponding power supply and the load, so as to switch the power supply; the first contact and the second contact of the conversion switch of each switching circuit are connected to the live wire of the power supply corresponding to the switching circuit; the third contact of the conversion switch of each switching circuit is connected to one end of the second switch of the switching circuit, the other end of the second switch is connected to one end of the second coil of the switching circuit, and the other end of the second coil is connected to the The neutral line of the power supply corresponding to the switching circuit; the fourth contact of the conversion switch of each switching circuit is connected to one end of the first switch of the switching circuit and one end of the third switch, the other end of the first switch is connected to the other end of the second switch of the switching circuit, the other end of the third switch is connected to one end of the first coil of the switching circuit, and the other end of the first coil is connected to the other end of the second coil of the switching circuit. The first switch of each switching circuit is turned on when the first coil of the switching circuit is energized, and is disconnected when it is not energized; the second switch and the third switch of each switching circuit are disconnected when the second coil of another switching circuit is energized, and are turned on when it is not energized. When the main power supply fails, the second coil of the switching circuit corresponding to the backup power supply is energized, so as to switch to the backup power supply in a timely and accurate manner to supply power to the load, which is beneficial to improving the reliability of the system. The conversion switch provides multiple control modes, which can realize the switching of the main power supply, which is beneficial to increasing the flexibility of the system.

[0082] Embodiment 2

[0083] Figure 4 FIG. 1 is a flow chart of a power switching method provided in an embodiment of the present application. The power switching method provided in this embodiment is used to control the power switching system as described above. Figure 4 As shown, the method includes:

[0084] S401, in response to the first mode instruction, conducting the connection between the second contact and the third contact of the conversion switch of the switching circuit corresponding to the first power source and the connection between the first contact and the fourth contact of the conversion switch of the switching circuit corresponding to the second power source, and disconnecting the connection between the first contact and the fourth contact of the conversion switch of the switching circuit corresponding to the first power source and the connection between the second contact and the third contact of the conversion switch of the switching circuit corresponding to the second power source, so as to switch to the first mode;

[0085] S402, in response to the second mode instruction, disconnect the connection between the second contact and the third contact of the conversion switch of the switching circuit corresponding to the first power supply and the connection between the first contact and the fourth contact of the conversion switch of the switching circuit corresponding to the second power supply, and connect the connection between the first contact and the fourth contact of the conversion switch of the switching circuit corresponding to the first power supply and the connection between the second contact and the third contact of the conversion switch of the switching circuit corresponding to the second power supply to switch to the second mode; wherein the main power supply is different in different modes.

[0086] Specifically, after the user selects the first power supply as the main power supply and the second power supply as the standby power supply, and issues the first mode instruction, in response to the first mode instruction, the connection between the second contact and the third contact of the conversion switch of the switching circuit corresponding to the first power supply and the connection between the first contact and the fourth contact of the conversion switch of the switching circuit corresponding to the second power supply are turned on, and the connection between the first contact and the fourth contact of the conversion switch of the switching circuit corresponding to the first power supply and the connection between the second contact and the third contact of the conversion switch of the switching circuit corresponding to the second power supply are disconnected, thereby switching the system to the first mode. After the user selects the first power supply as the standby power supply and the second power supply as the main power supply, and issues the second mode instruction, in response to the second mode instruction, the connection between the second contact and the third contact of the conversion switch of the switching circuit corresponding to the first power supply and the connection between the first contact and the fourth contact of the conversion switch of the switching circuit corresponding to the second power supply are disconnected, and the connection between the first contact and the fourth contact of the conversion switch of the switching circuit corresponding to the first power supply and the connection between the second contact and the third contact of the conversion switch of the switching circuit corresponding to the second power supply are turned on, thereby switching to the second mode, so that the system can accurately switch between different modes.

[0087] In the power switching method provided in this embodiment, by responding to the instructions of the corresponding mode, the connection between the second contact and the third contact, the connection between the first contact and the fourth contact of the conversion switch of the switching circuit corresponding to the first power supply, and the connection between the first contact and the fourth contact, and the connection between the second contact and the third contact of the conversion switch of the switching circuit corresponding to the second power supply are controlled, so that the system can be accurately switched to different modes, thereby realizing the switching of the main power supply, which is beneficial to improving the flexibility of the system.

[0088] Those skilled in the art will readily appreciate other embodiments of the present application after considering the specification and practicing the utility model disclosed herein. The present application is intended to cover any variations, uses or adaptations of the present application, which follow the general principles of the present application and include common knowledge or customary technical means in the art that are not disclosed in the present application. The specification and examples are intended to be exemplary only.

[0089] It should be understood that the present application is not limited to the exact construction that has been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof.

Claims

1. A power switching system, characterized in that: include: A first power supply, a second power supply, and a switching circuit and a switching switch corresponding to each power supply; each power supply is connected to one end of the corresponding switching switch, and the other end of the switching switch is connected to the load; Each switching circuit includes a first coil, a second coil, a first switch, a second switch, a third switch and a transfer switch; wherein the first switch of each switching circuit is turned on in response to the first coil of the switching circuit being energized, and is turned off when it is not energized; the second switch and the third switch of each switching circuit are turned off in response to the second coil of another switching circuit being energized, and are turned on when it is not energized; the transfer switch corresponding to each power supply is turned on in response to the second coil of the switching circuit corresponding to the power supply being energized, and is turned off when it is not energized; The conversion switch has a first contact, a second contact, a third contact and a fourth contact; the first contact and the second contact of the conversion switch of each switching circuit are connected to the live wire of the power supply corresponding to the switching circuit; the third contact of the conversion switch of each switching circuit is connected to one end of the second switch of the switching circuit, the other end of the second switch is connected to one end of the second coil of the switching circuit, and the other end of the second coil is connected to the neutral wire of the power supply corresponding to the switching circuit; the fourth contact of the conversion switch of each switching circuit is connected to one end of the first switch of the switching circuit and one end of the third switch, the other end of the first switch is connected to the other end of the second switch of the switching circuit, the other end of the third switch is connected to one end of the first coil of the switching circuit, and the other end of the first coil is connected to the other end of the second coil in the switching circuit.

2. The system according to claim 1, characterized in that The conversion switch of the switching circuit corresponding to the first power supply and the conversion switch of the switching circuit corresponding to the second power supply are the same conversion switch.

3. The system according to claim 1, characterized in that Each switching circuit also includes: a fourth switch and an indicator light; One end of the fourth switch is connected to the second contact of the conversion switch of the switching circuit, the other end of the fourth switch is connected to one end of the indicator light of the switching circuit, and the other end of the indicator light is connected to the neutral line of the power supply corresponding to the switching circuit; wherein the fourth switch of each switching circuit is turned on when the second coil of the switching circuit is energized, and is disconnected when it is not energized.

4. The system according to claim 1, characterized in that The first power supply and the second power supply are both three-phase power supplies, and the switching circuit corresponding to each power supply is connected to any live wire of the three-phase live wires of the power supply.

5. The system according to claim 4, characterized in that The power switching system further includes: a phase loss detection circuit corresponding to each power supply; One end of the phase loss detection circuit is connected to the live wire of the corresponding power supply, and the other end is connected to the corresponding switching circuit. It is used to cut off the connection between the power supply and the switching circuit corresponding to the power supply when the corresponding power supply loses phase, so that the second coil in the switching circuit corresponding to the power supply is not energized.

6. The system according to claim 5, characterized in that The phase loss detection circuit comprises: a plurality of coils and a plurality of switches corresponding to each other, wherein the plurality of switches correspond to the coils of the phase loss detection circuit to each other; Each coil of the phase loss detection circuit corresponds to two phases of the power supply corresponding to the phase loss detection circuit, different coils of the phase loss detection circuit correspond to different two phases of the power supply corresponding to the phase loss detection circuit, and both ends of each coil of the phase loss detection circuit are respectively connected to the live wires of the corresponding two phases of the corresponding power supply; Each switch of the phase loss detection circuit is turned on when the corresponding coil in the phase loss detection circuit is energized, and is turned off when the coil is not energized; the switches of the phase loss detection circuit are connected in series to form a series structure, one end of the series structure is connected to any live wire of the power supply corresponding to the phase loss detection circuit, and the other end is connected to the first contact of the conversion switch in the switching circuit corresponding to the phase loss detection circuit.

7. The system according to any one of claims 1 to 6, characterized in that: The power switching system further includes: a protection circuit corresponding to each power supply; One end of the protection circuit is connected to the live wire of the corresponding power supply, and the other end is connected to one end of the switching switch of the corresponding power supply, which is used to disconnect when the corresponding power supply has overcurrent or overvoltage, so as to cut off the connection between the power supply and the load.

8. The system according to claim 7, characterized in that The protection circuit comprises: a circuit breaker; One end of the circuit breaker is connected to the live wire of the power supply corresponding to the protection circuit, and the other end is connected to one end of the switching switch of the power supply corresponding to the protection circuit.

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