Alternating current power supply phase sequence fault suppression circuit

Abstract

The utility model relates to a suppression circuit for a phase sequence fault of an alternating current power supply. The suppression circuit comprises at least two power supplies, a switching circuit, a selection module and load equipment, wherein a plurality of first ends of the switching circuit are respectively connected with corresponding power supplies, and a plurality of second ends of the switching circuit are connected with a first end of the selection module; the second end of the selection module is connected with load equipment. According to the circuit, double power supplies supply power to load equipment, and the situation that the whole system is powered off due to the fact that one power supply fails can be avoided, so that the redundancy of power supply is improved; besides, the suppression circuit can detect the phase sequence state of the three-phase alternating-current power supply in real time through the phase sequence monitor, and cuts off the access between the power supply with the phase sequence fault and the selection module under the condition of the phase sequence fault of the three-phase alternating-current power supply, so that the power supply quality of the whole power supply system is ensured.

Description

Technical Field

[0001] The present application relates to the technical field of power supply, and in particular to a circuit for suppressing phase sequence fault of an alternating current power supply. Background Art

[0002] With the development of social economy and the acceleration of urbanization, the demand for AC power is increasing year by year, and three-phase AC power is gradually applied to household, industry, medical treatment, transportation, communication and other aspects.

[0003] However, if the three-phase AC power supply has a phase sequence error or phase failure during use, it is very easy to cause damage to the electrical equipment. Therefore, it is an urgent problem to monitor the phase sequence of the three-phase AC power supply in real time and cut off the three-phase AC power supply in time to protect the electrical equipment when a phase sequence failure occurs. Utility Model Content

[0004] Based on this, it is necessary to provide a circuit for suppressing phase sequence failure of three-phase AC power supply to address the problem in the prior art that the phase sequence of the three-phase AC power supply cannot be monitored in real time and that the three-phase AC power supply cannot be cut off in time when a phase sequence failure occurs to protect electrical equipment.

[0005] A suppression circuit for AC power phase sequence fault, characterized in that the suppression circuit comprises: at least two power supplies, a switch circuit, a selection module and a load device;

[0006] Among them, multiple first ends of the switch circuit are respectively connected to corresponding power sources, multiple second ends of the switch circuit are all connected to the first end of the selection module; and the second end of the selection module is connected to the load device.

[0007] In the embodiment of the present application, the switch circuit is in the on state so that the power signals output by at least two power supplies can reach the selection module through the switch circuit. After the selection module receives the at least two power signals transmitted based on the switch circuit, it selects one power supply to power the load device so that the load device works normally; or, the switch circuit is in the off state so that the power signals output by at least two power supplies cannot reach the selection module through the switch circuit, so that the selection module cannot receive the power signals transmitted based on the switch circuit, and then cannot select one power supply to power the load device, so that the load device is in a stagnant state. The above circuit realizes dual power supply for the load device, which can avoid the situation where one power supply fails and causes the entire system to be powered off, thereby improving the redundancy of the power supply.

[0008] In one embodiment, the switch circuit comprises a plurality of switch devices, a first end of each switch device is connected to a corresponding power source, and a second end of each switch device is connected to a first end of the selection module.

[0009] In the embodiment of the present application, the switch devices corresponding to each power supply are placed in a conducting state, so that the power signals output by at least two power supplies can reach the selection module through their corresponding switch devices. After the selection module receives at least two power signals transmitted by each switch device, it selects one power supply to power the load device, so that the load device can work normally. On the basis of the above embodiment, the switch circuit includes a plurality of switch devices, the first end of each switch device is respectively connected to the corresponding power supply, and the second end of each switch device is connected to the first end of the selection module, which further realizes the dual power supply for the load device, and can avoid the situation where one power supply fails and causes the entire system to be powered off, thereby improving the redundancy of the power supply.

[0010] In one embodiment, the suppression circuit further includes: a controller; and a plurality of third terminals of the switch circuit are respectively connected to a plurality of output terminals of the controller.

[0011] The controller may send an on or off instruction to the switch circuit / switch device to indicate that the switch circuit / switch device is in an on or off state. For example, the controller sends an on instruction to the switch circuit / switch device to indicate that the corresponding switch device is in an on state, so that the switch device in the on state transmits the corresponding power signal to the selection module; for another example, the controller sends an off instruction to the switch circuit / switch device to indicate that the corresponding switch device is in an off state, so that the switch device in the off state cannot transmit the corresponding power signal to the selection module.

[0012] In the embodiment of the present application, the controller controls the on / off state of the switch circuit, so that the switch device in the on / off state turns on / off the corresponding power supply and the electrical signal transmission between the selection module. The above-mentioned suppression circuit controls the on / off state of the switch circuit by the controller to realize dual power supply for the load device, which can avoid the situation where one power failure causes the whole system to be powered off, thereby improving the redundancy of the power supply.

[0013] In one embodiment, the third terminals of the switch devices are respectively connected to corresponding output terminals of the controller.

[0014] The above suppression circuit controls the on-off state of the switch device through the controller, thereby realizing dual power supply for the load device, which can avoid the situation where one power failure causes power failure of the entire system, thereby improving the redundancy of power supply.

[0015] In one embodiment, the switch device comprises: a three-phase AC contactor.

[0016] The switch device in the above embodiment includes a three-phase AC contactor, which provides a basis for ensuring that the power signal of the three-phase power supply is transmitted to the selection module.

[0017] In one embodiment, the controller includes a PLC programmable logic controller.

[0018] The controller in the above embodiment includes a three-phase AC contactor, which provides a basis for ensuring that the power signal of the three-phase power supply is transmitted to the selection module.

[0019] In one embodiment, the suppression circuit further includes: a phase sequence monitor, the third terminal of the selection module is connected to the input terminal of the phase sequence monitor, and the output terminal of the phase sequence monitor is connected to the input terminal of the controller.

[0020] The phase sequence monitor 60 is used to generate an abnormal signal and transmit the abnormal signal to the controller 50 when a power supply 10 having a timing fault is detected in at least two power supplies 10, wherein the timing fault includes timing errors and chaos.

[0021] The controller 50 is used to receive the abnormal signal output by the phase sequence monitor 60 , determine the faulty power source 10 according to the abnormal signal, and control the corresponding switch device 201 to disconnect the path between the faulty power source 10 and the selection module 30 .

[0022] The phase sequence monitor 60 is further configured to generate a normal signal and transmit the normal signal to the controller 50 when it is detected that no power source 10 has a timing fault among the at least two power sources 10 .

[0023] The controller 50 is also used to receive the normal signal output by the phase sequence monitor, determine the normal power source 10 according to the normal signal, and control the corresponding switch device 201 to conduct the path between the normal power source 10 and the selection module 30.

[0024] The above suppression circuit can detect the phase sequence state of the three-phase AC power supply in real time through the phase sequence monitor, and in the case of a phase sequence failure of the three-phase AC power supply, cut off the path between the power supply with the phase sequence failure and the selection module, thereby ensuring the power supply quality of the entire power supply system.

[0025] In one embodiment, the phase sequence monitor comprises a PSP phase sequence protector.

[0026] The above-mentioned phase sequence monitor includes a PSP phase sequence protector, which provides a basis for ensuring real-time monitoring of the power supply signal of the three-phase power supply and transmitting the monitored power supply signal to the controller.

[0027] In one embodiment, the selection module includes a PD power redundancy module.

[0028] The above-mentioned selection module includes a PD power redundancy module, which realizes dual power supply for load equipment and can avoid the situation where one power failure causes power failure of the entire system, thereby improving the redundancy of power supply.

[0029] In one embodiment, the power of the load device is greater than a preset power threshold.

[0030] The above AC power phase sequence failure suppression circuit realizes dual power supply for load equipment, which can avoid the situation that one power failure causes power failure of the entire system, thereby improving the redundancy of power supply. In addition, the phase sequence state of the three-phase AC power supply can be detected in real time by the phase sequence monitor, and in the case of a phase sequence failure of the three-phase AC power supply, the path between the power supply with the phase sequence failure and the selection module is cut off, thereby ensuring the power supply quality of the entire power supply system. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] FIG1 is a schematic diagram of a circuit for suppressing an AC power supply phase sequence fault in an embodiment;

[0032] FIG2 is a schematic diagram of a circuit for suppressing an AC power supply phase sequence fault in another embodiment;

[0033] FIG3 is a schematic diagram of a circuit for suppressing an AC power supply phase sequence fault in another embodiment;

[0034] FIG4 is a schematic diagram of a circuit for suppressing an AC power supply phase sequence fault in another embodiment;

[0035] Description of Figure Numbers:

[0036] 01-Suppression circuit of AC power phase sequence fault;

[0037] 10- Power supply;

[0038] 20- switch circuit;

[0039] 30-Select module;

[0040] 40- load equipment;

[0041] 50-controller;

[0042] 60-Phase sequence monitor;

[0043] 201-Switch device. DETAILED DESCRIPTION

[0044] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0045] In the description of the present application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0046] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0047] In this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0048] In the present application, unless otherwise clearly specified and limited, if there is a description that a first feature is "above" or "below" a second feature, etc., or similar descriptions appear, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0049] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only implementation method.

[0050] With the development of social economy and the acceleration of urbanization, the demand for AC power supply has increased year by year, and three-phase AC power supply has been gradually applied to various fields such as household, industry, medical treatment, transportation, and communication. The three-phase AC power supply is an electric power system composed of three AC circuits with the same frequency, equal potential amplitude, and a phase difference of 120°. my country produces and distributes three-phase AC power. However, if the three-phase AC power supply has a phase sequence error or a phase failure during use, it is very easy to cause damage to the electrical equipment. Therefore, it has become a problem to be solved urgently to monitor the phase sequence of the three-phase AC power supply in real time and cut off the three-phase AC power supply in time to protect the electrical equipment when a phase sequence failure occurs. The utility model aims to solve this problem.

[0051] After introducing the background technology of the AC power supply phase sequence fault suppression circuit provided by the embodiment of the present application, the AC power supply phase sequence fault suppression circuit described in the present application will be introduced in detail below.

[0052] In an exemplary embodiment, as shown in FIG1 , a suppression circuit 01 for AC power phase sequence fault is provided, comprising: at least two power supplies 10 , a switch circuit 20 , a selection module 30 , and a load device 40 ;

[0053] The multiple first ends of the switch circuit 20 are respectively connected to the corresponding power sources 10 , the multiple second ends of the switch circuit 20 are all connected to the first end of the selection module 30 ; and the second end of the selection module 30 is connected to the load device 40 .

[0054] The selection module 40 is used to select a power source 10 to supply power to the load device 40 according to the power signal transmitted by the switch circuit 20 .

[0055] The two power sources 10 both include a three-phase AC power source, which provides power to the load device 40 via the switch circuit 20 and the selection module 30 to ensure the normal operation of the load device 40 .

[0056] The switch circuit 20 includes a three-phase switch circuit, and the switch circuit 20 is used to ensure the on / off state between the power supply and the selection module 30. For example, when the power supply 10 is turned on, the switch circuit 20 is automatically in the on state, and when the power supply 10 is not turned on, the switch circuit 20 is automatically in the off state.

[0057] The selection module 30 includes a PD power redundancy module, and the selection module 30 is used for, when any one or more of the at least two power supplies 10 fails, the other normal power supplies 10 immediately take over their work to ensure the normal power supply of the load device 40, and after the failed power supply is repaired, coordinate all power supplies 10 to provide normal power supply to the load device 40. The addition of the selection module 30 is to achieve high availability of the load device 40.

[0058] The power of the load device 40 is greater than a preset power threshold, and the load device 40 includes equipment such as a compressor, a fluorine pump and a server.

[0059] In the embodiment of the present application, the switch circuit 20 is placed in an on state so that the power signals output by at least two power sources 10 can reach the selection module 30 through the switch circuit 20. After the selection module 30 receives the at least two power signals transmitted based on the switch circuit 20, it selects one power source 10 to power the load device 40 so that the load device 40 works normally; or, the switch circuit 20 is placed in an off state so that the power signals output by at least two power sources 10 cannot reach the selection module 30 through the switch circuit 20, so that the selection module 30 cannot receive the power signal transmitted based on the switch circuit 20, and further cannot select one power source 10 to power the load device 40, so that the load device 40 is in a stagnant state.

[0060] The AC power supply phase sequence fault suppression circuit provided in the embodiment of the present application includes: at least two power supplies, a switch circuit, a selection module and a load device; wherein, the multiple first ends of the switch circuit are respectively connected to the corresponding power supplies, and the multiple second ends of the switch circuit are all connected to the first end of the selection module; the second end of the selection module is connected to the load device. The above circuit realizes dual power supply for the load device, which can avoid the situation where one power supply fails and causes the whole system to be powered off, thereby improving the redundancy of the power supply.

[0061] In an exemplary embodiment, as shown in FIG. 2 , the switch circuit 20 includes a plurality of switch devices 201 , a first end of each switch device 201 is connected to a corresponding power source 10 , and a second end of each switch device 201 is connected to a first end of the selection module 30 .

[0062] Among them, the switching device 201 includes a three-phase AC contactor, which is used to transmit the power signal of its corresponding power supply 10 to the selection module 30, so as to ensure the on-off state between its corresponding power supply 10 and the selection module 30, and when the corresponding power supply 10 and the selection module 30 are conductive, the power supply 10 provides electrical energy to the load device 40.

[0063] In the embodiment of the present application, the switch devices 201 corresponding to each power supply 10 are placed in a conducting state, so that the power signals output by at least two power supplies 10 can reach the selection module 30 through their corresponding switch devices 201. After the selection module 30 receives at least two power signals transmitted based on each switch device 201, it selects one power supply to power the load device 40, so that the load device 40 works normally; or, the switch device 201 corresponding to any one of the at least two power supplies 10 is placed in a disconnected state, so that the power signal output by any one power supply cannot reach the selection module 30 through its corresponding switch device 201, so that the selection module 30 cannot receive the power signal transmitted based on its corresponding switch device 201, and then the selection module 30 selects one power supply 10 from the power supplies 10 corresponding to other switch devices 201 to power the load device 40, so that the load device 40 is in a stagnant state.

[0064] The AC power supply phase sequence fault suppression circuit 01 provided in the embodiment of the present application is based on the above embodiment. The switch circuit 20 includes multiple switch devices 201, and the first end of each switch device 201 is respectively connected to the corresponding power supply 10, and the second end of each switch device 201 is connected to the first end of the selection module 30, which further realizes dual power supply for the load device 40, and can avoid the situation where one power supply failure causes power failure of the entire system, thereby improving the redundancy of power supply.

[0065] In an exemplary embodiment, as shown in FIG. 3 , the suppression circuit further includes: a controller 50 ; a plurality of third terminals of the switch circuit 20 are respectively connected to a plurality of output terminals of the controller 50 , and a third terminal of each switch device 201 is respectively connected to a corresponding output terminal of the controller 50 .

[0066] The controller 50 may send a turn-on or turn-off instruction to the switch circuit 20 / switch device 201 to indicate that the switch circuit 20 / switch device 201 is in the turn-on or turn-off state. For example, the controller 50 sends a turn-on instruction to the switch circuit 20 / switch device 201 to indicate that the corresponding switch device 201 is in the turn-on state, so that the switch device 201 in the turn-on state transmits the corresponding power signal to the selection module 30; for another example, the controller 50 sends a turn-off instruction to the switch circuit 20 / switch device 201 to indicate that the corresponding switch device 201 is in the turn-off state, so that the switch device 201 in the turn-off state cannot transmit the corresponding power signal to the selection module 30. The controller 50 includes a programmable logic controller (PLC).

[0067] In the embodiment of the present application, the controller 50 controls the on / off state of the switch circuit 20 , so that the switch device 201 in the on / off state turns on / off the corresponding electrical signal transmission between the power source 20 and the selection module 30 .

[0068] The AC power supply phase sequence fault suppression circuit provided in the embodiment of the present application, based on the above embodiment, further includes: a controller; multiple third terminals of the switch circuit are respectively connected to multiple output terminals of the controller. The controller further controls the on-off state of the switch circuit to realize dual power supply for the load device, which can avoid the situation where one power supply failure causes the entire system to be powered off, thereby improving the redundancy of the power supply.

[0069] In an exemplary embodiment, as shown in FIG4 , the suppression circuit 01 further includes: a phase sequence monitor 60 , the third terminal of the selection module 30 is connected to the input terminal of the phase sequence monitor 60 , and the output terminal of the phase sequence monitor 60 is connected to the input terminal of the controller 50 ;

[0070] The phase sequence monitor 60 is used to generate an abnormal signal when a power source 10 having a timing fault is detected in at least two power sources 10, and transmit the abnormal signal to the controller 50;

[0071] The controller 50 is used to receive the abnormal signal output by the phase sequence monitor 60 , determine the faulty power source 10 according to the abnormal signal, and control the corresponding switch device 201 to disconnect the path between the faulty power source 10 and the selection module 30 .

[0072] Among them, timing failures include timing errors and chaos.

[0073] The phase sequence monitor 60 includes a phase sequence protector (PSP). The phase sequence monitor 60 is used to monitor the power signal inputted from the input end of the selection module 30 in real time, and transmit the monitored power signal to the controller 50. After receiving the power signal monitored by the phase sequence monitor 60, the controller 50 determines whether the power signal monitored by the phase sequence monitor 60 is a normal signal, and if it is determined that the power signal monitored by the phase sequence monitor 60 is an abnormal signal, the controller 50 determines the corresponding power supply 10 with phase sequence fault according to the abnormal signal, and controls the switch device 201 corresponding to the power supply 10 with phase sequence fault to disconnect the path between the faulty power supply 10 and the selection module 30.

[0074] In one embodiment, the phase sequence monitor 60 is further used to generate a normal signal when it is detected that no power source 10 with a timing fault occurs in at least two power sources 10, and transmit the normal signal to the controller 50;

[0075] The controller 50 is also used to receive the normal signal output by the phase sequence monitor, determine the normal power source 10 according to the normal signal, and control the corresponding switch device 201 to conduct the path between the normal power source 10 and the selection module 30.

[0076] Among them, the phase sequence monitor 60 is used to monitor the power signal input into the input end of the selection module 30 in real time, and transmit the monitored power signal to the controller 50. After receiving the power signal monitored by the phase sequence monitor 60, the controller 50 determines whether the power signal monitored by the phase sequence monitor 60 is a normal signal, and when it is determined that the power signal monitored by the phase sequence monitor 60 is a normal signal, the controller 50 determines the corresponding power supply 10 with normal phase sequence according to the normal signal, and controls the switch device 201 corresponding to the power supply 10 with normal phase sequence to turn on the path between the normal power supply 10 and the selection module 30.

[0077] The suppression circuit for phase sequence fault of AC power provided in the embodiment of the present application also includes: a phase sequence monitor, the third end of the selection module is connected to the input end of the phase sequence monitor, and the output end of the phase sequence monitor is connected to the input end of the controller. The above suppression circuit can detect the phase sequence state of the three-phase AC power supply in real time through the phase sequence monitor, and in the case of a phase sequence fault of the three-phase AC power supply, cut off the path between the power supply with the phase sequence fault and the selection module, thereby ensuring the power supply quality of the entire power supply system.

[0078] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0079] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A suppression circuit for AC power phase sequence fault, characterized in that: The suppression circuit includes: at least two power supplies, a switch circuit, a selection module and a load device; Among them, multiple first ends of the switch circuit are respectively connected to corresponding power sources, multiple second ends of the switch circuit are all connected to the first end of the selection module; and the second end of the selection module is connected to the load device.

2. The suppression circuit according to claim 1, characterized in that The switch circuit includes a plurality of switch devices, a first end of each of the switch devices is connected to a corresponding power source, and a second end of each of the switch devices is connected to a first end of the selection module.

3. The suppression circuit according to claim 2, characterized in that The suppression circuit further includes: a controller; and a plurality of third terminals of the switch circuit are respectively connected to a plurality of output terminals of the controller.

4. The suppression circuit according to claim 3, characterized in that The third end of each of the switch devices is connected to the corresponding output end of the controller.

5. The suppression circuit according to any one of claims 2 to 4, characterized in that: The switch device comprises: a three-phase AC contactor.

6. The suppression circuit according to claim 3 or 4, characterized in that: The controller includes a PLC programmable logic controller.

7. The suppression circuit according to claim 3, characterized in that The suppression circuit further includes: a phase sequence monitor, the third end of the selection module is connected to the input end of the phase sequence monitor, and the output end of the phase sequence monitor is connected to the input end of the controller.

8. The suppression circuit according to claim 7, characterized in that The phase sequence monitor includes a PSP phase sequence protector.

9. The suppression circuit according to claim 1, characterized in that The selection module includes a PD power redundancy module.

10. The suppression circuit according to claim 1, characterized in that The power of the load device is greater than a preset power threshold.

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