Dual-power change-over switch

Abstract

An embodiment of the present disclosure provides a dual power transfer switch, comprising: a first circuit breaker and a second circuit breaker, each including a closing coil and a first main contact, the first main contact in the first circuit breaker being electrically connected to a main power supply, and the first main contact in the second circuit breaker being electrically connected to a backup power supply; each of the first interlocking circuit and the second interlocking circuit comprises a first auxiliary contact, a driving coil and a pair of second main contacts, and the opening and closing states of the first auxiliary contact and the pair of second main contacts in each of the first interlocking circuit and the second interlocking circuit are opposite; a first auxiliary contact of each of the first interlock circuit and the second interlock circuit is electrically connected to a drive coil of the other interlock circuit, and paired second main contacts in the first interlock circuit are electrically connected to a closing coil in the first circuit breaker. And a pair of second main contacts in the second interlock circuit are electrically connected to a closing coil in the second circuit breaker.

Description

TECHNICAL FIELD

[0001] Embodiments of the present disclosure generally relate to the technical field of electrical equipment, and more particularly, to a dual power transfer switch. BACKGROUND

[0002] With the increasing requirement of key load on power supply continuity, the demand for dual power, uninterruptible power supply and other equipment is also increasing, and the dual power transfer switch plays a key role in it.

[0003] In a conventional dual power transfer switch, the pair of circuit breakers are respectively connected to one of the dual power supplies, and the controller controls the energization of the closing coil or the opening coil to realize the closing or opening operation of the circuit breaker. However, how to realize the closing interlocking function of the pair of circuit breakers in the dual power transfer switch is a technical problem that needs to be solved at present. CONTENT OF THE UTILITY MODEL

[0004] The purpose of the present disclosure is to provide a dual power transfer switch to at least partially solve the above problems.

[0005] In one aspect of the present disclosure, a dual power transfer switch is provided, which is adapted to be connected to a main power supply and a backup power supply and comprises: a first circuit breaker and a second circuit breaker, each comprising a closing coil and a first main contact, the first main contact in the first circuit breaker being electrically connected to the main power supply, and the first main contact in the second circuit breaker being electrically connected to the backup power supply; and a first interlocking circuit and a second interlocking circuit, each comprising a first auxiliary contact, a drive coil and a pair of second main contacts, the opening and closing states of the first auxiliary contact and the pair of second main contacts in each of the first interlocking circuit and the second interlocking circuit are opposite, the first auxiliary contact of each of the first interlocking circuit and the second interlocking circuit is electrically connected to the drive coil of the other interlocking circuit, the pair of second main contacts in the first interlocking circuit is electrically connected to the closing coil in the first circuit breaker, and the pair of second main contacts in the second interlocking circuit is electrically connected to the closing coil in the second circuit breaker, wherein the drive coil in one of the first interlocking circuit and the second interlocking circuit can drive the corresponding pair of second main contacts to close when energized.

[0006] According to the embodiment of the present disclosure, when the drive coil in the first interlocking circuit is energized, the drive coil in the first interlocking circuit can drive the pair of second main contacts in the first interlocking circuit to close, and then the closing coil of the first circuit breaker is energized, so that the first circuit breaker is closed. However, since the opening and closing states of the first auxiliary contact and the pair of second main contact in each interlocking circuit are opposite, the first auxiliary contact in the first interlocking circuit is open, so that the drive coil in the second interlocking circuit is not energized, and then the pair of second main contacts in the second interlocking circuit cannot be closed, resulting in that the closing coil in the second circuit breaker cannot be energized, and the second circuit breaker cannot be closed. Similarly, when the drive coil in the second interlocking circuit is energized, the second circuit breaker is closed, and the first circuit breaker cannot be closed. Therefore, the dual power transfer switch according to the embodiment of the present disclosure can make the first circuit breaker and the second circuit breaker cannot be closed at the same time through the interlocking of the first interlocking circuit and the second interlocking circuit, so as to realize the closing interlocking function of the pair of circuit breakers, thereby avoiding the short circuit of the main power supply and the standby power supply.

[0007] In some embodiments, the dual power transfer switch further comprises a voltage reduction circuit, an input end of the voltage reduction circuit is electrically connected to the main power supply and the standby power supply, and the first circuit breaker and the second circuit breaker each further comprise a second auxiliary contact opposite to the opening and closing state of the first main contact, the second auxiliary contact comprises a first end, and an output end of the voltage reduction circuit is electrically connected to the first end of the second auxiliary contact in the first circuit breaker and the first end of the second auxiliary contact in the second circuit breaker.

[0008] In some embodiments, the second auxiliary contact further comprises a second end, the second end of the second auxiliary contact in the first circuit breaker is electrically connected to the first auxiliary contact in the first interlocking circuit, and the second end of the second auxiliary contact in the second circuit breaker is electrically connected to the first auxiliary contact in the second interlocking circuit.

[0009] In some embodiments, the dual power transfer switch further comprises a control circuit, a first sampling circuit and a second sampling circuit, the first sampling circuit is electrically connected to the standby power supply to collect a state signal of the standby power supply, the second sampling circuit is electrically connected to the main power supply to collect a state signal of the main power supply, and the control circuit is electrically connected to the first sampling circuit and the second sampling circuit respectively to obtain the state signal of the standby power supply and the state signal of the main power supply.

[0010] In some embodiments, the dual power transfer switch further comprises a selection circuit, an input of the selection circuit is electrically connected to the main power supply and the backup power supply, and the selection circuit is electrically connected to the control circuit to enable the control circuit to control the selection circuit to select one of the backup power supply and the main power supply based on a status signal of the backup power supply and a status signal of the main power supply.

[0011] In some embodiments, the dual power transfer switch further comprises a first node and a second node, the first node and the second node are electrically connected to an output of the selection circuit, one of the pair of second main contacts in the first interlocking circuit and one of the pair of second main contacts in the second interlocking circuit are respectively electrically connected to the first node, and the other of the pair of second main contacts in the first interlocking circuit and the other of the pair of second main contacts in the second interlocking circuit are respectively electrically connected to the second node.

[0012] In some embodiments, the dual power transfer switch further comprises a first switch circuit and a second switch circuit electrically connected to the control circuit, the first switch circuit is electrically connected to the drive coil in the first interlocking circuit, and the second switch circuit is electrically connected to the drive coil in the second interlocking circuit.

[0013] In some embodiments, the first circuit breaker and the second circuit breaker each further comprise a motor, two ends of the motor of one of the first circuit breaker and the second circuit breaker are respectively electrically connected to the first node and the second node.

[0014] In some embodiments, the first circuit breaker and the second circuit breaker each further comprise a trip coil, the dual power transfer switch further comprises a first trip circuit and a second trip circuit, the first trip circuit and the second trip circuit each comprise an actuating coil and a pair of third main contacts, the pair of third main contacts in the first trip circuit are electrically connected to the trip coil in the first circuit breaker, and the pair of third main contacts in the second trip circuit are electrically connected to the trip coil in the second circuit breaker, wherein the actuating coil in the first trip circuit and the second trip circuit can drive the corresponding pair of third main contacts to close when the actuating coil is energized.

[0015] In some embodiments, one of the pair of third main contacts in the first disconnecting circuit and one of the pair of third main contacts in the second disconnecting circuit are electrically connected to the first node, the other of the pair of third main contacts in the first disconnecting circuit and the other of the pair of third main contacts in the second disconnecting circuit are electrically connected to the second node, and the output of the voltage reduction circuit is electrically connected to the actuating coil in the first disconnecting circuit and the actuating coil in the second disconnecting circuit.

[0016] In some embodiments, the dual power transfer switch further comprises a third switching circuit and a fourth switching circuit connected with the control circuit, the third switching circuit is electrically connected to the actuating coil of the first disconnecting circuit, and the fourth switching circuit is electrically connected to the actuating coil of the second disconnecting circuit.

[0017] It should be understood that the content described in this section is not intended to limit the key features or important features of the embodiments of the present disclosure, nor is it used to limit the scope of the present disclosure. Other features of the present disclosure will become apparent through the following description. BRIEF DESCRIPTION OF DRAWINGS

[0018] The above and other features, advantages, and aspects of embodiments of the present disclosure will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings in which:

[0019] Figure 1 A working schematic diagram of a dual power transfer switch according to some embodiments of the present disclosure is shown;

[0020] Figure 2 A working schematic diagram of Figure 1 A structural schematic diagram of the first circuit breaker and the second circuit breaker is shown;

[0021] Figure 3 A working schematic diagram of Figure 1 A structural schematic diagram of the first interlocking circuit and the second interlocking circuit is shown;

[0022] Figure 4 A working schematic diagram of Figure 1 A structural schematic diagram of the first disconnecting circuit and the second disconnecting circuit is shown.

[0023] BRIEF DESCRIPTION OF DRAWINGS

[0024] 100 is a dual power transfer switch; 200 is a main power supply; 300 is a backup power supply;

[0025] 11 is a first circuit breaker, 12 is a second circuit breaker, 131 is a closing coil, 132 is a first main contact, 133 is a second auxiliary contact, 1331 is a first end, 1332 is a second end, 134 is an opening coil, 135 is a motor;

[0026] 21 is a first interlock circuit, 22 is a second interlock circuit, 231 is a first auxiliary contact, 232 is a drive coil, 233 is a second main contact;

[0027] 3 is a step-down circuit; 4 is a control circuit; 5 is a selection circuit;

[0028] 61 is a first node, 62 is a second node;

[0029] 71 is a first sampling circuit, 72 is a second sampling circuit;

[0030] 81 is a first switching circuit, 82 is a second switching circuit, 83 is a third switching circuit, 84 is a fourth switching circuit;

[0031] 91 is a first opening circuit, 92 is a second opening circuit, 931 is an actuating coil, 932 is a third main contact. DETAILED DESCRIPTION

[0032] Preferred embodiments of the present disclosure will be described in greater detail below, with reference to the accompanying drawings. While preferred embodiments of the present disclosure are shown in the drawings, it is understood that the present disclosure can be embodied in various forms without being limited by the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the present disclosure to those skilled in the art.

[0033] The term "comprising" and variations thereof as used herein are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements is not necessarily limited to those elements, but can include other elements not expressly listed or inherent to such process, method, article, or apparatus. Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an overly literal sense unless expressly so defined herein.

[0034] As described above, the paired circuit breakers in a conventional dual power conversion switch are respectively connected to one of the dual power sources, and the controller realizes the closing or opening operation of the circuit breaker by controlling whether the closing coil or the opening coil is energized. However, in the case where the controller sends an erroneous instruction, the circuit breakers may close at the same time, thereby causing the risk of short-circuiting the dual power sources. Therefore, how to realize the closing interlocking function of the paired circuit breakers in the dual power conversion switch is a technical problem that urgently needs to be solved. The embodiment of the present disclosure provides a dual power conversion switch 100 to at least partially solve the above problem. In the following, Figures 1 to 4 The principles of the present disclosure are described.

[0035] Figure 1 FIG. 1 shows a schematic diagram of the operation of a dual power conversion switch 100 according to some embodiments of the present disclosure. Figure 1 As shown, the dual power conversion switch 100 described herein generally includes a first circuit breaker 11, a second circuit breaker 12, a first interlock circuit 21, a second interlock circuit 22, a step-down circuit 3, a control circuit 4, a selection circuit 5, a first node 61, a second node 62, a first sampling circuit 71, a second sampling circuit 72, a first switching circuit 81, a second switching circuit 82, a third switching circuit 83, a fourth switching circuit 84, a first tripping circuit 91, and a second tripping circuit 92. The first interlock circuit 21, the second interlock circuit 22, the first tripping circuit 91, and the second tripping circuit 92 include relays capable of high isolation and large current.

[0036] Figure 2 Shown Figure 1 The schematic diagram of the structure of the first circuit breaker 11 and the second circuit breaker 12 is shown in FIG. Figures 1 to 2 As shown, in some embodiments, the first circuit breaker 11 and the second circuit breaker 12 each include a closing coil 131, an opening coil 134, a first main contact 132, and a motor 135. The first main contact 132 in the first circuit breaker 11 can be electrically connected to the main power source 200, and the first main contact 132 in the second circuit breaker 12 can be electrically connected to the backup power source 300. When energized, the motor 135 can rotate and compress a spring, causing the spring to store energy. When the closing coil 131 of each of the first and second circuit breakers 11 and 12 is energized, the closing coil 131 can generate a magnetic field and drive a release member to release the spring. The spring releases energy and, through an intermediate mechanism, drives the corresponding first main contact 132, thereby closing the circuit breaker. Correspondingly, when the opening coil 134 of each of the first and second circuit breakers 11 and 12 is energized, the opening coil 134 can also generate a magnetic field, causing the circuit breaker to open.

[0037] However, the inventors have noticed that, during the operation of the double power transfer switch 100, if the control circuit 4 sends a false command and causes the closing coil 131 in the first circuit breaker 11 and the second circuit breaker 12 to be energized at the same time, the first circuit breaker 11 and the second circuit breaker 12 can be closed at the same time, thereby causing the risk of short-circuiting the main power supply 200 and the standby power supply 300.

[0038] Based on this, Figure 3 It is shown Figure 1 The structure diagram of the first interlocking circuit 21 and the second interlocking circuit 22 is shown. As Figure 3 As shown, in some embodiments, the first interlocking circuit 21 and the second interlocking circuit 22 each include a first auxiliary contact 231, a driving coil 232, and a pair of second main contacts 233. The opening and closing states of the first auxiliary contact 231 and the pair of second main contacts 233 in each of the first interlocking circuit 21 and the second interlocking circuit 22 are opposite. For example, when the pair of second main contacts 233 in the first interlocking circuit 21 is in a closed state, then the first auxiliary contact 231 in the first interlocking circuit 21 is in an open state. And when the pair of second main contacts 233 in the first interlocking circuit 21 is in an open state, then the first auxiliary contact 231 in the first interlocking circuit 21 is in a closed state. The opening and closing states of the first auxiliary contact 231 and the pair of second main contacts 233 in the second interlocking circuit 22 are also the same, which will not be described here.

[0039] In some embodiments, the first auxiliary contact 231 is associated with and opposite to the pair of second main contacts 233 through a mechanical linkage, for example, two ends of the mechanical linkage can be coupled to the pair of second main contacts 233 and the first auxiliary contact 231 respectively, when the pair of second main contacts 233 act, the first auxiliary contact 231 is actuated through the transmission of the mechanical linkage.

[0040] Referring to Figure 3 Further, the driving coil 232 in one of the first interlocking circuit 21 and the second interlocking circuit 22 can drive the corresponding pair of second main contacts 233 to close when energized. That is, when the driving coil 232 in the first interlocking circuit 21 is energized, the driving coil 232 generates an electromagnetic force and can drive the pair of second main contacts 233 in the first interlocking circuit 21 to close. And when the driving coil 232 in the second interlocking circuit 22 is energized, the driving coil 232 generates an electromagnetic force and can drive the pair of second main contacts 233 in the second interlocking circuit 22 to close.

[0041] Continuing to refer to Figure 3Further, since the first auxiliary contact 231 of each interlocking circuit is electrically connected to the drive coil 232 of the other interlocking circuit, the open / close state of the first auxiliary contact 231 of each interlocking circuit directly affects whether the drive coil 232 of the other interlocking circuit is energized or not.

[0042] As can be appreciated, the first auxiliary contact 231 in the first interlocking circuit 21 is electrically connected to the drive coil 232 of the second interlocking circuit 22, and the first auxiliary contact 231 in the second interlocking circuit 22 is electrically connected to the drive coil 232 of the first interlocking circuit 21. With the above configuration, if the drive coil 232 of the second interlocking circuit 22 is energized, the first auxiliary contact 231 in the first interlocking circuit 21 must be closed. And if the drive coil 232 of the first interlocking circuit 21 is energized, the first auxiliary contact 231 in the second interlocking circuit 22 must be closed.

[0043] Continuing to refer to Figures 2 to 3 Further, the pair of second main contacts 233 in the first interlocking circuit 21 is electrically connected to the close coil 131 in the first circuit breaker 11, and the pair of second main contacts 233 in the second interlocking circuit 22 is electrically connected to the close coil 131 in the second circuit breaker 12. That is, with the pair of second main contacts 233 in the first interlocking circuit 21 closed, the close coil 131 in the first circuit breaker 11 can be energized. And with the pair of second main contacts 233 in the second interlocking circuit 22 closed, the close coil 131 in the second circuit breaker 12 can be energized.

[0044] According to embodiments of the present disclosure, with the drive coil 232 in the first interlocking circuit 21 energized, the drive coil 232 in the first interlocking circuit 21 can drive the pair of second main contacts 233 in the first interlocking circuit 21 to close, and then the close coil 131 of the first circuit breaker 11 is energized, so that the first circuit breaker 11 is closed. However, since the open / close states of the first auxiliary contact 231 and the pair of second main contacts 233 in each interlocking circuit are opposite, the first auxiliary contact 231 in the first interlocking circuit 21 is open, so that the drive coil 232 in the second interlocking circuit 22 is not energized, and then the pair of second main contacts 233 in the second interlocking circuit 22 cannot be closed, resulting in that the close coil 131 in the second circuit breaker 12 cannot be energized, and the second circuit breaker 12 cannot be closed. Similarly, with the drive coil 232 in the second interlocking circuit 22 energized, the second circuit breaker 12 is closed, and the first circuit breaker 11 cannot be closed.

[0045] Therefore, the dual power transfer switch 100 according to the embodiments of the present disclosure can make the first circuit breaker 11 and the second circuit breaker 12 unable to be closed simultaneously by the interlocking of the first interlocking circuit 21 and the second interlocking circuit 22, so as to realize the closing interlocking function of the pair of circuit breakers, thereby avoiding the short circuit of the main power supply 200 and the standby power supply 300. In addition, the dual power transfer switch 100 according to the embodiments of the present disclosure has a simple structure and can adapt to various voltage grades, and is safe and reliable.

[0046] Referring back to Figure 1 In some embodiments, the input end of the step-down circuit 3 is electrically connected to the main power supply 200 and the standby power supply 300 to take power from the main power supply 200 or the standby power supply 300. The step-down circuit 3 can convert alternating voltage into direct current output voltage Vcoil, for example, the direct current output voltage can include 12Vdc or 24Vdc. Therefore, the dual power transfer switch 100 according to the embodiments of the present disclosure can meet the power supply requirements of multiple electrical components.

[0047] Referring back to Figure 2 In some embodiments, the first circuit breaker 11 and the second circuit breaker 12 each further include a second auxiliary contact 133 opposite to the opening and closing state of the first main contact 132. For example, when the first main contact 132 in the first circuit breaker 11 is in a closed state, then the second auxiliary contact 133 in the first circuit breaker 11 is in an open state; and when the first main contact 132 in the first circuit breaker 11 is in an open state, then the second auxiliary contact 133 in the first circuit breaker 11 is in a closed state. The opening and closing states of the first main contact 132 and the second auxiliary contact 133 in the second circuit breaker 12 are also the same, which will not be described here.

[0048] Preferably, the control circuit 4 can collect the state of the second auxiliary contact 133 in the first circuit breaker 11 and the second circuit breaker 12 to detect whether the first circuit breaker 11 and the second circuit breaker 12 are in a closed or open state, so as to reasonably control the first circuit breaker 11 and the second circuit breaker 12 to perform closing and opening operations. In addition, the control circuit 4 can also collect the state of the motor 135 in the first circuit breaker 11 and the second circuit breaker 12.

[0049] Referring back to Figures 1 to 3Further, the second auxiliary contact 133 can include a first end 1331 and a second end 1332. The output end of the voltage reduction circuit 3 is electrically connected to the first end 1331 of the second auxiliary contact 133 in the first circuit breaker 11, and the second end 1332 of the second auxiliary contact 133 in the first circuit breaker 11 is electrically connected to the first auxiliary contact 231 in the first interlocking circuit 21. The output end of the voltage reduction circuit 3 is also electrically connected to the first end 1331 of the second auxiliary contact 133 in the second circuit breaker 12, and the second end 1332 of the second auxiliary contact 133 in the second circuit breaker 12 is electrically connected to the first auxiliary contact 231 in the second interlocking circuit 22. Thus, the DC output voltage Vcoil output by the voltage reduction circuit 3 can power the drive coil 232 in the first interlocking circuit 21 and the second interlocking circuit 22.

[0050] According to embodiments of the present disclosure, as described above, the first circuit breaker 11 can be closed when the drive coil 232 in the first interlocking circuit 21 is energized; then the first main contact 132 of the first circuit breaker 11 is closed, and the second auxiliary contact 133 of the first circuit breaker 11 is opened. Since the second end 1332 of the second auxiliary contact 133 of the first circuit breaker 11 is electrically connected to the first auxiliary contact 231 in the first interlocking circuit 21, and then to the drive coil 232 in the second interlocking circuit 22, the drive coil 232 in the second interlocking circuit 22 cannot be energized, and then the pair of second main contacts 233 in the second interlocking circuit 22 cannot be closed, resulting in that the closing coil 131 in the second circuit breaker 12 cannot be energized, and the second circuit breaker 12 cannot be closed. Similarly, when the drive coil 232 in the second interlocking circuit 22 is energized, the second circuit breaker 12 is closed, and the first circuit breaker 11 cannot be closed.

[0051] Therefore, the dual power transfer switch 100 according to embodiments of the present disclosure can prevent the first circuit breaker 11 and the second circuit breaker 12 from being closed at the same time through the interlocking of the first circuit breaker 11 and the second circuit breaker 12, so as to realize the double closing interlocking function of the pair of circuit breakers, thereby avoiding the short circuit of the main power supply 200 and the backup power supply 300.

[0052] Referring back to Figure 1 In some embodiments, the first sampling circuit 71 can be electrically connected to the backup power supply 300 to collect the status signal of the backup power supply 300, and the second sampling circuit 72 is electrically connected to the main power supply 200 to collect the status signal of the main power supply 200. The control circuit 4 is electrically connected to the first sampling circuit 71 and the second sampling circuit 72 respectively to obtain the status signal of the backup power supply 300 and the status signal of the main power supply 200. Thus, the control circuit 4 can obtain the respective status of the main power supply 200 and the backup power supply 300 through the first sampling circuit 71 and the second sampling circuit 72.

[0053] Continuing to refer toFigure 1 In some embodiments, the input of the selection circuit 5 is electrically connected to the main power source 200 and the backup power source 300. The selection circuit 5 can be electrically connected to the control circuit 4. The control circuit 4 can send a selection control instruction to the selection circuit 5 based on the status signal of the backup power source 300 and the status signal of the main power source 200, so as to control the selection circuit 5 to select one of the backup power source 300 and the main power source 200. That is, in the case that the main power source 200 is in good condition, the control circuit 4 controls the selection circuit 5 to be connected to the main power source 200. In the case that the backup power source 300 is in good condition, the control circuit 4 controls the selection circuit 5 to be connected to the backup power source 300.

[0054] With reference to the foregoing Figures 1 to 3 In some embodiments, the first node 61 and the second node 62 are electrically connected to the output of the selection circuit 5. One of the second main contacts 233 in the pair of second main contacts 233 in the first interlocking circuit 21 and one of the second main contacts 233 in the pair of second main contacts 233 in the second interlocking circuit 22 are respectively electrically connected to the first node 61. The other of the second main contacts 233 in the pair of second main contacts 233 in the first interlocking circuit 21 and the other of the second main contacts 233 in the pair of second main contacts 233 in the second interlocking circuit 22 are respectively electrically connected to the second node 62. Thus, in the case that the pair of second main contacts 233 in the first interlocking circuit 21 are closed, the selection circuit 5 can select one of the backup power source 300 and the main power source 200 to supply power to the closing coil 131 in the first circuit breaker 11. In the case that the pair of second main contacts 233 in the second interlocking circuit 22 are closed, the selection circuit 5 can select one of the backup power source 300 and the main power source 200 to supply power to the closing coil 131 in the second circuit breaker 12.

[0055] With reference to the foregoing Figures 1 to 2 Further, the two ends of the motor 135 of one of the first circuit breaker 11 and the second circuit breaker 12 are respectively electrically connected to the first node 61 and the second node 62. Thus, the selection circuit 5 can select one of the backup power source 300 and the main power source 200 to supply power to the motor 135 and rotate the motor 135 to compress the spring.

[0056] With reference to the foregoing Figure 1 and Figure 3In some embodiments, the first switch circuit 81 and the second switch circuit 82 are electrically connected to the control circuit 4 respectively. The first switch circuit 81 is electrically connected to the drive coil 232 in the first interlock circuit 21, and the second switch circuit 82 is electrically connected to the drive coil 232 in the second interlock circuit 22. Thus, in the case that the main power source 200 is in good condition, the control circuit 4 controls the first switch circuit 81 to be conductive, then the drive coil 232 in the first interlock circuit 21 is energized, the pair of second main contacts 233 in the first interlock circuit 21 is closed, so that the closing coil 131 in the first circuit breaker 11 is energized, the first circuit breaker 11 is closed, then the double power transfer switch 100 can be switched to the main power source 200. While in the case that the standby power source 300 is in good condition, the control circuit 4 controls the second switch circuit 82 to be conductive, then the drive coil 232 in the second interlock circuit 22 is energized, the pair of second main contacts 233 in the second interlock circuit 22 is closed, so that the closing coil 131 in the second circuit breaker 12 is energized, the second circuit breaker 12 is closed, then the double power transfer switch 100 can be switched to the standby power source 300.

[0057] Figure 4 The structure of the first opening circuit 91 and the second opening circuit 92 is shown. Figure 1 As shown in the figure, in some embodiments, the first opening circuit 91 and the second opening circuit 92 each include an actuating coil 931 and a pair of third main contacts 932. Since the pair of circuit breakers does not need to have the opening interlock function, the third auxiliary contacts in the first opening circuit 91 and the second opening circuit 92 do not need to be connected. Figure 1 and Figure 4 As shown in the figure, in some embodiments, the first opening circuit 91 and the second opening circuit 92 each include an actuating coil 931 and a pair of third main contacts 932. Since the pair of circuit breakers does not need to have the opening interlock function, the third auxiliary contacts in the first opening circuit 91 and the second opening circuit 92 do not need to be connected.

[0058] Referring to Figure 1 , Figure 2 and Figure 4 Further, the pair of third main contacts 932 in the first opening circuit 91 is electrically connected to the opening coil 134 in the first circuit breaker 11, and the pair of third main contacts 932 in the second opening circuit 92 is electrically connected to the opening coil 134 in the second circuit breaker 12. Like the drive coil 232 in the first interlock circuit 21 and the second interlock circuit 22, in the case that the actuating coil 931 in the first opening circuit 91 and the second opening circuit 92 is energized, the actuating coil 931 can drive the corresponding pair of third main contacts 932 to be closed.

[0059] With the above configuration, in the case that the actuating coil 931 in the first tripping circuit 91 is energized, the actuating coil 931 generates electromagnetic force and can drive the pair of third main contacts 932 in the first tripping circuit 91 to close, then the tripping coil 134 in the first circuit breaker 11 is energized, and the first circuit breaker 11 can trip. In the case that the actuating coil 931 in the second tripping circuit 92 is energized, the actuating coil 931 generates electromagnetic force and can drive the pair of third main contacts 932 in the second tripping circuit 92 to close, then the tripping coil 134 in the second circuit breaker 12 is energized, and the second circuit breaker 12 can trip.

[0060] With continued reference to Figure 1 , Figure 2 and Figure 4 , in some embodiments, one of the pair of third main contacts 932 in the first tripping circuit 91 and one of the pair of third main contacts 932 in the second tripping circuit 92 are respectively electrically connected to the first node 61. The other of the pair of third main contacts 932 in the first tripping circuit 91 and the other of the pair of third main contacts 932 in the second tripping circuit 92 are respectively electrically connected to the second node 62. Thus, in the case that the pair of third main contacts 932 in the first tripping circuit 91 are closed, the selection circuit 5 can select one of the backup power source 300 and the main power source 200 to supply power to the tripping coil 134 in the first circuit breaker 11. In the case that the pair of third main contacts 932 in the second tripping circuit 92 are closed, the selection circuit 5 can select one of the backup power source 300 and the main power source 200 to supply power to the tripping coil 134 in the second circuit breaker 12.

[0061] With continued reference to Figure 1 and Figure 4 , in some embodiments, the output of the step-down circuit 3 is electrically connected to the actuating coil 931 in the first tripping circuit 91 and the actuating coil 931 in the second tripping circuit 92. The third switch circuit 83 and the fourth switch circuit 84 are respectively electrically connected to the control circuit 4. The third switch circuit 83 is electrically connected to the actuating coil 931 of the first tripping circuit 91, and the fourth switch circuit 84 is electrically connected to the actuating coil 931 of the second tripping circuit 92.

[0062] With the above configuration, in the case where the state of the main power supply 200 is poor, the control circuit 4 controls the third switch circuit 83 to be on, and then the output terminal of the step-down circuit 3, the actuating coil 931 of the first tripping circuit 91, and the third switch circuit 83 form a path, the actuating coil 931 of the first tripping circuit 91 is energized, and thus the tripping coil 134 of the first circuit breaker 11 is energized, and the first circuit breaker 11 can be tripped. In the case where the state of the backup power supply 300 is poor, the control circuit 4 controls the fourth switch circuit 84 to be on, and then the output terminal of the step-down circuit 3, the actuating coil 931 of the second tripping circuit 92, and the fourth switch circuit 84 form a path, and then the actuating coil 931 of the second tripping circuit 92 is energized, and thus the tripping coil 134 of the second circuit breaker 12 is energized, and the second circuit breaker 12 can be tripped.

[0063] In some embodiments, the first switch circuit 81, the second switch circuit 82, the third switch circuit 83, and the fourth switch circuit 84 include one of a triode and a MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor).

[0064] The process of switching the dual power transfer switch 100 from the main power supply 200 to the backup power supply 300 will be described below:

[0065] The first circuit breaker 11 is closed: the first main contact 132 is closed, and the second auxiliary contact 133 is open. The second circuit breaker 12 is tripped: the first main contact 132 is open, and the second auxiliary contact 133 is closed.

[0066] The control circuit 4 controls the third switch circuit 83 to be on, and then the output terminal of the step-down circuit 3, the actuating coil 931 of the first tripping circuit 91, and the third switch circuit 83 form a path, and the actuating coil 931 of the first tripping circuit 91 is energized. The actuating coil 931 of the first tripping circuit 91 drives the pair of third main contacts 932 of the first tripping circuit 91 to be closed, the tripping coil 134 of the first circuit breaker 11 is energized, and the first circuit breaker 11 is tripped. The first main contact 132 of the first circuit breaker 11 is open, and the second auxiliary contact 133 of the first circuit breaker 11 is closed.

[0067] The control circuit 4 controls the second switch circuit 82 to be on, and then the output terminal of the step-down circuit 3, the second auxiliary contact 133 of the first circuit breaker 11, the first auxiliary contact 231 of the first interlocking circuit 21, the driving coil 232 of the second interlocking circuit 22, and the second switch circuit 82 form a path, and the driving coil 232 of the second interlocking circuit 22 is energized. The driving coil 232 of the second interlocking circuit 22 drives the pair of second main contacts 233 of the second interlocking circuit 22 to be closed, the closing coil 131 of the second circuit breaker 12 is energized, and the second circuit breaker 11 is closed. The dual power transfer switch 100 is switched to the backup power supply 300.

[0068] It should be noted that the process of switching the dual power transfer switch 100 from the backup power source 300 to the main power source 200 is similar to the above process, which will not be described here.

[0069] In addition, the switching control timing of the dual power transfer switch 100 according to the embodiments of the present disclosure is all based on the principle of first separation and then combination, thereby ensuring safety.

[0070] The closing interlock design according to the embodiments of the present disclosure can be applied to various dual power transfer switches to at least partially solve the above problems. It should be understood that the closing interlock design according to the embodiments of the present disclosure can also be applied to other electrical components, and the embodiments of the present disclosure are not limited thereto.

[0071] The above has described the embodiments of the present disclosure, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes are obvious to those skilled in the art without departing from the scope and spirit of the described embodiments. The selection of the terms used herein is intended to best explain the principles of the embodiments, practical application, or improvement of the technology in the market, or to enable other ordinary skilled persons in the art to understand the embodiments disclosed herein.

Claims

1. A dual power transfer switch (100), characterized in that: The dual power conversion switch (100) is suitable for connecting to a main power source (200) and a backup power source (300) and comprises: A first circuit breaker (11) and a second circuit breaker (12), each comprising a closing coil (131) and a first main contact (132), the first main contact (132) in the first circuit breaker (11) being electrically connected to the main power source (200), and the first main contact (132) in the second circuit breaker (12) being electrically connected to the backup power source (300); and A first interlock circuit (21) and a second interlock circuit (22), each comprising a first auxiliary contact (231), a drive coil (232), and a pair of second main contacts (233); the first auxiliary contact (231) and the pair of second main contacts (233) in each of the first interlock circuit (21) and the second interlock circuit (22) are in opposite open and closed states; the first auxiliary contact (231) in each of the first interlock circuit (21) and the second interlock circuit (22) is electrically connected to the drive coil (232) of the other interlock circuit; the pair of second main contacts (233) in the first interlock circuit (21) is electrically connected to the closing coil (131) in the first circuit breaker (11); and the pair of second main contacts (233) in the second interlock circuit (22) is electrically connected to the closing coil (131) in the second circuit breaker (12); The driving coil (232) in one of the first interlock circuit (21) and the second interlock circuit (22) can drive the corresponding pair of second main contacts (233) to close when energized.

2. The dual power conversion switch (100) according to claim 1, characterized in that: The dual power conversion switch (100) further comprises a step-down circuit (3), the input end of the step-down circuit (3) being electrically connected to the main power supply (200) and the backup power supply (300), the first circuit breaker (11) and the second circuit breaker (12) each comprising a second auxiliary contact (133) having an opening and closing state opposite to that of the first main contact (132), the second auxiliary contact (133) comprising a first end (1331), and the output end of the step-down circuit (3) being electrically connected to the first end (1331) of the second auxiliary contact (133) in the first circuit breaker (11) and the first end (1331) of the second auxiliary contact (133) in the second circuit breaker (12).

3. The dual power conversion switch (100) according to claim 2, characterized in that: The second auxiliary contact (133) further includes a second end (1332), the second end (1332) of the second auxiliary contact (133) in the first circuit breaker (11) being electrically connected to the first auxiliary contact (231) in the first interlock circuit (21), and the second end (1332) of the second auxiliary contact (133) in the second circuit breaker (12) being electrically connected to the first auxiliary contact (231) in the second interlock circuit (22).

4. The dual power conversion switch (100) according to claim 2, characterized in that: The dual power conversion switch (100) further comprises a control circuit (4), a first sampling circuit (71) and a second sampling circuit (72); the first sampling circuit (71) is electrically connected to the backup power supply (300) to collect a status signal of the backup power supply (300); the second sampling circuit (72) is electrically connected to the main power supply (200) to collect a status signal of the main power supply (200); and the control circuit (4) is electrically connected to the first sampling circuit (71) and the second sampling circuit (72) respectively to obtain a status signal of the backup power supply (300) and a status signal of the main power supply (200).

5. The dual power conversion switch (100) according to claim 4, characterized in that: The dual power conversion switch (100) further includes a selection circuit (5), an input end of which is electrically connected to the main power supply (200) and the backup power supply (300), and the selection circuit (5) is electrically connected to the control circuit (4) so ​​that the control circuit (4) controls the selection circuit (5) to select one of the backup power supply (300) and the main power supply (200) based on a status signal of the backup power supply (300) and a status signal of the main power supply (200).

6. The dual power conversion switch (100) according to claim 5, characterized in that: The dual power conversion switch (100) further includes a first node (61) and a second node (62), wherein the first node (61) and the second node (62) are electrically connected to the output end of the selection circuit (5), one second main contact (233) of the pair of second main contacts (233) in the first interlock circuit (21) and one second main contact (233) of the pair of second main contacts (233) in the second interlock circuit (22) are electrically connected to the first node (61), and the other second main contact (233) of the pair of second main contacts (233) in the first interlock circuit (21) and the other second main contact (233) of the pair of second main contacts (233) in the second interlock circuit (22) are electrically connected to the second node (62).

7. The dual power conversion switch (100) according to claim 6, characterized in that: The dual power conversion switch (100) further comprises a first switch circuit (81) and a second switch circuit (82) electrically connected to the control circuit (4), wherein the first switch circuit (81) is electrically connected to a drive coil (232) in the first interlock circuit (21), and the second switch circuit (82) is electrically connected to a drive coil (232) in the second interlock circuit (22).

8. The dual power conversion switch (100) according to claim 7, characterized in that: The first circuit breaker (11) and the second circuit breaker (12) each further include a motor (135), and two ends of the motor (135) of one of the first circuit breaker (11) and the second circuit breaker (12) are electrically connected to the first node (61) and the second node (62), respectively.

9. The dual power conversion switch (100) according to claim 6, characterized in that: The first circuit breaker (11) and the second circuit breaker (12) each further include a tripping coil (134); the dual power conversion switch (100) further includes a first tripping circuit (91) and a second tripping circuit (92); the first tripping circuit (91) and the second tripping circuit (92) each include an actuating coil (931) and a pair of third main contacts (932); the pair of third main contacts (932) in the first tripping circuit (91) are electrically connected to the tripping coil (134) in the first circuit breaker (11); and the pair of third main contacts (932) in the second tripping circuit (92) are electrically connected to the tripping coil (134) in the second circuit breaker (12). When the actuating coils (931) in the first opening circuit (91) and the second opening circuit (92) are energized, the actuating coils (931) can drive the corresponding pairs of third main contacts (932) to close.

10. The dual power conversion switch (100) according to claim 9, characterized in that: One third main contact (932) of the paired third main contacts (932) in the first opening circuit (91) and one third main contact (932) of the paired third main contacts (932) in the second opening circuit (92) are electrically connected to the first node (61), respectively; the other third main contact (932) of the paired third main contacts (932) in the first opening circuit (91) and the other third main contact (932) of the paired third main contacts (932) in the second opening circuit (92) are electrically connected to the second node (62), respectively; and the output end of the step-down circuit (3) is electrically connected to the actuating coil (931) in the first opening circuit (91) and the actuating coil (931) in the second opening circuit (92).

11. The dual power conversion switch (100) according to claim 10, characterized in that: The dual power conversion switch (100) further comprises a third switch circuit (83) and a fourth switch circuit (84) connected to the control circuit (4), wherein the third switch circuit (83) is electrically connected to the actuating coil (931) of the first opening circuit (91), and the fourth switch circuit (84) is electrically connected to the actuating coil (931) of the second opening circuit (92).

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