A power switching device and power supply system

Abstract

The embodiment of the present disclosure provides a power switching device and a power supply system. The power switching device comprises: a first contactor comprising a first coil, a first normally open contact and a first normally closed contact, the first coil being connected with a first pole pin and a second pole pin of a first input terminal; a first control module connected with the first input terminal and a power output terminal; a second control module connected with a second input terminal and the power output terminal; a trigger module connected with the first normally open contact and the first normally closed contact, the trigger module being configured to receive two groups of different trigger signals from the first normally open contact and the first normally closed contact according to the energization state of the first coil, and selectively trigger the first control module to communicate the first input terminal with the power output terminal or trigger the second control module to communicate the second input terminal with the power output terminal under the control of the trigger signals. The power switching device of the present disclosure has simple structure and stable control.

Description

Technical Field

[0001] This disclosure relates to the field of power supply technology, and in particular to a power switching device and a power supply system. Background Technology

[0002] To ensure continuous and uninterrupted operation of electrical equipment, at least two power sources are typically used. These two power sources are connected to the equipment via a power switching device. One power source can serve as the primary power source, and the other as the secondary power source. Before the power switching device switches, the primary power source is connected to the equipment. When the primary power source fails, the secondary power source is switched to the equipment via the power switching device, ensuring continuous and uninterrupted operation.

[0003] The power switching devices in related technologies require manual assistance or complex control and detection circuits. There is an urgent need for a power switching device with a simple structure and stable control. Summary of the Invention

[0004] This disclosure provides a power switching device and a power supply system to solve or alleviate one or more technical problems in the prior art.

[0005] As a first aspect of the present disclosure, an embodiment of the present disclosure provides a power switching device, including a first input terminal, a second input terminal, and a power output terminal. The first input terminal is used to connect to a power supply pin of a first power supply, and the second input terminal is used to connect to a power supply pin of a second power supply. The power switching device further includes:

[0006] The first contactor includes a first coil, a first normally open contact, and a first normally closed contact. The two ends of the first coil are respectively connected to the first pole pin and the second pole pin of the first input terminal.

[0007] The first control module is connected to the first input terminal and the power output terminal;

[0008] The second control module is connected to the second input terminal and the power output terminal;

[0009] The trigger module is connected to the first normally open contact and the first normally closed contact. The trigger module is configured to receive two different sets of trigger signals from the first normally open contact and the first normally closed contact according to the energization state of the first coil, and selectively trigger the first control module to connect the first input terminal to the power output terminal under the control of the trigger signals, or trigger the second control module to connect the second input terminal to the power output terminal.

[0010] In some embodiments, one end of the first normally open contact is connected to the trigger module, and the other end is connected to the second pin of the first input terminal; one end of the first normally closed contact is connected to the trigger module, and the other end is connected to the second pin of the second input terminal.

[0011] In some embodiments, the first control module includes at least one second normally open contact, which is disposed between the first input terminal and the power output terminal. The trigger module triggers the first control module to close the at least one second normally open contact.

[0012] In some embodiments, the trigger module includes a second coil, and the trigger signal includes a first trigger signal. The second coil is energized under the control of the first trigger signal and triggers at least one second normally open contact to close.

[0013] In some embodiments, the second control module includes a third normally closed contact, a second coil, the third normally closed contact and a first normally open contact are connected in series between the first pole pin and the second pole pin of the first input terminal, the trigger signal includes a second trigger signal, and the trigger module is further configured to trigger the third normally closed contact to open under the control of the second trigger signal.

[0014] In some embodiments, one end of the second coil is connected to the first pole pin of the first input terminal, and the other end is connected to the third normally closed contact.

[0015] In some embodiments, at least one second normally open contact includes two second normally open contacts, wherein one second normally open contact is connected between the first pin of the first input terminal and the first pin of the power output terminal, and the other second normally open contact is connected between the second pin of the first input terminal and the second pin of the power output terminal.

[0016] In some embodiments, the second control module includes at least one third normally open contact, which is disposed between the second input terminal and the power output terminal. The trigger module triggers the second control module to close the at least one third normally open contact.

[0017] In some embodiments, the trigger module includes a third coil, and the trigger signal includes a second trigger signal. The third coil is energized under the control of the second trigger signal and triggers at least one third normally open contact to close.

[0018] In some embodiments, the first control module includes a second normally closed contact, a third coil, the second normally closed contact and the first normally closed contact are connected in series between the first pole pin and the second pole pin of the second input terminal, the trigger signal includes a first trigger signal, and the trigger module is further configured to trigger the second normally closed contact to open under the control of the first trigger signal.

[0019] In some embodiments, one end of the third coil is connected to the first pole pin of the second input terminal, and the other end is connected to the second normally closed contact.

[0020] In some embodiments, at least one third normally open contact includes two third normally open contacts, wherein one third normally open contact is connected between the first pin of the second input terminal and the first pin of the power output terminal, and the other third normally open contact is connected between the second pin of the second input terminal and the second pin of the power output terminal.

[0021] In some embodiments, the system further includes a second contactor and a third contactor. The second contactor includes a second coil, at least one second normally open contact, and a second normally closed contact. The third contactor includes a third coil, at least one third normally open contact, and a third normally closed contact. The first control module includes the second normally open contact and the second normally closed contact in the second contactor. The second control module includes the third normally open contact and the third normally closed contact in the third contactor. The triggering module includes the second coil and the third coil.

[0022] The second coil, the third normally closed contact, and the first normally open contact are connected in series between the first pole pin and the second pole pin of the first input terminal, and at least one second normally open contact is disposed between the first input terminal and the power output terminal.

[0023] The third coil, the second normally closed contact, and the first normally closed contact are connected in series between the first and second pins of the second input terminal, and at least one third normally open contact is disposed between the second input terminal and the power output terminal.

[0024] In some embodiments, the first power source includes an AC power source, and the first contactor includes a first AC contactor; the second power source includes an AC power source.

[0025] As a second aspect of the present disclosure, the present disclosure provides a power supply system including the power switching device of the present disclosure.

[0026] In some embodiments, a power processing circuit is further included. The input side of the power processing circuit is connected to the power output terminal of the power switching device, and the output side of the power processing circuit is used to supply power to the electrical device. The power processing circuit is configured to convert the first voltage output by the power output terminal into a second voltage to provide the second voltage to the electrical device.

[0027] The technical solution of this disclosure embodiment, by setting a first contactor and connecting the trigger module to the first normally open contact and the first normally closed contact, realizes that when the main power supply is working normally, the main power supply supplies power to the electrical equipment. When the first power supply fails, the first contactor realizes automatic switching between the first power supply and the second power supply, realizing continuous and uninterrupted power supply to the electrical equipment. Furthermore, when the first coil is energized in different states, the trigger module receives two different sets of trigger signals (the first trigger signal and the second trigger signal). The difference between the two sets of trigger signals realizes reliable electrical interlocking, which can ensure that only one of the first power supply and the second power supply supplies power to the electrical equipment at any given time. The power switching device of this disclosure is simple in structure and stable in performance.

[0028] The above overview is for illustrative purposes only and is not intended to be limiting in any way. In addition to the illustrative aspects, embodiments, and features described above, further aspects, embodiments, and features of this disclosure will become readily apparent from the accompanying drawings and the following detailed description. Attached Figure Description

[0029] In the accompanying drawings, unless otherwise specified, the same reference numerals throughout the various drawings denote the same or similar parts or elements. These drawings are not necessarily drawn to scale. It should be understood that these drawings depict only some embodiments according to this disclosure and should not be construed as limiting the scope of this disclosure.

[0030] Figure 1 This is a circuit topology diagram of a power switching device in one embodiment of the present disclosure;

[0031] Figure 2 This is a circuit topology diagram of a power switching device in another embodiment of the present disclosure;

[0032] Figure 3 This is a circuit topology diagram of a power switching device in another embodiment of the present disclosure;

[0033] Figure 4 for Figure 3 A schematic diagram of the working process of the power switching device shown.

[0034] Figure 5 This is a circuit topology diagram of a power switching device in yet another embodiment of this disclosure;

[0035] Figure 6 This is a circuit topology diagram of a power supply system in one embodiment of the present disclosure;

[0036] Figure 7 This is a circuit topology diagram of a power processing circuit in one embodiment of the present disclosure;

[0037] Figure 8This is a circuit topology diagram of a power processing circuit in one embodiment of the present disclosure. Detailed Implementation

[0038] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of this disclosure. Therefore, the drawings and description are to be considered exemplary in nature and not restrictive.

[0039] In related technologies, power switching devices typically employ Automatic Transfer Switch (ATS) mechanisms or bidirectional thyristor static transfer switches (STS) to switch between dual power supplies. ATS mechanisms, in addition to contactors, require two circuit breakers to achieve mechanical or electrical interlocking, and manual switching of both circuit breakers is necessary when switching between the two power supplies. Power switching devices using bidirectional thyristor static transfer switches (STS) offer high switching reliability, but require more complex control and detection circuits. Insufficient product testing can also introduce power interference and noise, resulting in poor static and dynamic overload capacity, and significant heat generation under high power loads.

[0040] To address some problems in the related technologies, embodiments of this disclosure provide a power switching device. Figure 1 This is a circuit topology diagram of a power switching device in one embodiment of the present disclosure, as follows: Figure 1 As shown, the power switching device includes a first input terminal IN1, a second input terminal IN2, and a power output terminal OUT. The first input terminal IN1 is used to connect to the power supply pin of the first power supply 11, and the second input terminal IN2 is used to connect to the power supply pin of the second power supply 12. The power output terminal OUT is used to connect to the electrical device. The first power supply 11 or the second power supply 12 provides power to the electrical device through the power switching device.

[0041] The power switching device also includes a first contactor, a first control module 21, a second control module 22, and a trigger module 30. The first contactor includes a first coil (which can be called the KM1 coil), a first normally open contact T11, and a first normally closed contact NC1. In the first contactor, when the first coil is not energized, the first normally open contact T11 is open, and the first normally closed contact NC1 is closed and conducting; when the first coil is energized, the first normally open contact T11 closes and conducts, and the first normally closed contact NC1 opens. The two ends of the first coil are connected to the first and second pins of the first input terminal IN1, respectively. When the first power supply 11 is connected to the first input terminal IN1 and supplies power, the first coil is energized, the first normally open contact T11 changes from open to closed, and the first normally closed contact NC1 changes from closed to open.

[0042] It is understood that a power source typically includes a positive and a negative terminal. In this document, the first terminal is one of the positive and negative terminals, and the second terminal is the other of the positive and negative terminals. In the embodiments illustrated in the accompanying drawings, the first terminal is used as the positive terminal and the second terminal as the negative terminal for example. In other embodiments, the first terminal can be the negative terminal and the second terminal can be the positive terminal.

[0043] The first control module 21 is connected to the first input terminal IN1 and the power output terminal OUT. The second control module 22 is connected to the second input terminal IN2 and the power output terminal OUT.

[0044] The trigger module 30 is connected to both the first normally open contact T11 and the first normally closed contact NC1. The trigger module 30 is configured to receive two different sets of trigger signals from the first normally open contact T11 and the first normally closed contact NC1 according to the energization state of the first coil, and selectively trigger the first control module 21 to connect the first input terminal IN1 to the power output terminal OUT, or trigger the second control module 22 to connect the second input terminal IN2 to the power output terminal OUT.

[0045] In other words, the trigger module 30 can receive two different sets of trigger signals from the first normally open contact T11 and the first normally closed contact NC1 according to the energization state of the first coil, and selectively trigger the first control module 21 or the second control module 22 under the control of the trigger signals. The first control module 21 connects the first input terminal IN1 to the power output terminal OUT, and the second control module 22 connects the second input terminal IN2 to the power output terminal OUT.

[0046] Based on the nature of the first contactor, the states of the first normally open contact T11 and the first normally closed contact NC1 are different when the first coil is not energized or is energized. Therefore, the trigger module 30 can receive two different sets of trigger signals from the first normally open contact T11 and the first normally closed contact NC1 according to the energization state of the first coil. For example, when the first coil is energized, the first normally open contact T11 is closed and the first normally closed contact NC1 is open, and the trigger module 30 receives the first trigger signal, which can be denoted as 10; when the first coil is not energized or is de-energized, the first normally open contact T11 is open and the first normally closed contact NC1 is closed, and the trigger module 30 receives the second trigger signal, which can be denoted as 01. The first trigger signal and the second trigger signal are different. Under the control of the first trigger signal, the trigger module 30 can trigger the first control module 21 to connect the first input terminal IN1 with the power output terminal OUT, thereby supplying power to the electrical equipment through the power output terminal OUT of the first power supply 11. Under the control of the second trigger signal, the trigger module 30 can trigger the second control module 22 to connect the second input terminal IN2 with the power output terminal OUT, so that the second power supply 12 supplies power to the electrical equipment through the power output terminal OUT.

[0047] In this disclosed technical solution, the two ends of the first coil are connected to the first and second pins of the first input terminal IN1, respectively. The first power supply 11 can be regarded as the main power supply, and the second power supply 12 as the auxiliary power supply. When the main power supply is supplying power normally, the first coil is energized, and the trigger module 30 receives the first trigger signal, which connects the first input terminal IN1 with the power output terminal OUT, thereby the first power supply 11 supplies power to the electrical equipment. When the main power supply fails, the first coil is de-energized, and the trigger module 30 receives the second trigger signal, which connects the second input terminal IN2 with the power output terminal OUT.

[0048] Therefore, the power switching device disclosed herein, by setting a first contactor and connecting the trigger module 30 to the first normally open contact T11 and the first normally closed contact NC1, realizes that when the main power supply is working normally, the main power supply supplies power to the electrical equipment. When the main power supply fails, the first contactor realizes the automatic switching between the main power supply and the auxiliary power supply, realizing continuous and uninterrupted power supply to the electrical equipment. Furthermore, when the first coil is energized in different states, the trigger module 30 receives two different sets of trigger signals (the first trigger signal and the second trigger signal). The difference between the two sets of trigger signals realizes reliable electrical interlocking, which can ensure that only one of the first power supply 11 and the second power supply 12 supplies power to the electrical equipment at any given time. The power switching device disclosed herein has a simple structure and stable performance.

[0049] like Figure 1As shown, in order for the trigger module 30 to receive two different sets of trigger signals from the first normally open contact T11 and the first normally closed contact NC1, one end of the first normally open contact T11 is connected to the trigger module 30, and the other end is connected to the second pin of the first input terminal IN1, and then to the second pin of the first power supply 11; one end of the first normally closed contact NC1 is connected to the trigger module 30, and the other end is connected to the second pin of the second input terminal IN2, and then to the second pin of the second power supply 12.

[0050] When the first coil is energized, the first normally open contact T11 is closed, transmitting the signal from the second pin of the first power supply 11 to the trigger module 30. The first normally closed contact NC1 is open, preventing the transmission of the signal from the second pin of the second power supply 12 to the trigger module 30. In this case, the first trigger signal received by the trigger module 30 can be considered as 10. When the first coil is de-energized, the first normally open contact T11 is open, preventing the transmission of the signal from the second pin of the first power supply 11 to the trigger module 30. The first normally closed contact NC1 is closed, transmitting the signal from the second pin of the second power supply 12 to the trigger module 30. In this case, the second trigger signal received by the trigger module 30 can be considered as 01.

[0051] Figure 2 This is a circuit topology diagram of a power switching device in another embodiment of the present disclosure, such as... Figure 2 As shown, the first control module 21 may include at least one second normally open contact T2, which is located between the first input terminal IN1 and the power output terminal OUT. The trigger module 30 triggers the first control module 21 to close at least one second normally open contact T2. For example, one end of the second normally open contact T2 is connected to the first input terminal IN1, and the other end is connected to the power output terminal OUT. When the second normally open contact T2 is closed and conducting, the first input terminal IN1 is connected to the power output terminal OUT, allowing the first power supply 11 to supply power to the electrical equipment. When the trigger module 30 does not receive the first trigger signal, at least one second normally open contact T2 remains open. By configuring the first control module 21 with at least one second normally open contact T2 that can be triggered by the trigger module 30, the structure of the first control module 21 is simple, the control is simple, and complex control and detection circuits are avoided.

[0052] like Figure 2As shown, the trigger module 30 may include a second coil (also called the KM2 coil). The trigger signal includes a first trigger signal. Under the control of the first trigger signal, the second coil is energized and triggers at least one second normally open contact to close; or, in the case of the first trigger signal, the second coil is energized and triggers at least one second normally open contact T2 to close. In this structure, the second coil and the second normally open contact T2 can be part of a second contactor. When the trigger module 30 receives the first trigger signal, the first trigger signal energizes the coil in the second contactor, thereby causing the second normally open contact T2 to close and conduct. When the second coil is de-energized, the second normally open contact T2 opens. This structure allows the functions of the second coil and the second normally open contact T2 to be realized using only one second contactor, further simplifying the structure of the power switching device.

[0053] In other embodiments, a first relay can also be used to implement the functions of the trigger module 30 and the second normally open contact T2. For example, the second coil and at least one second normally open contact T2 are part of the first relay. When the trigger module 30 receives a first trigger signal, the first trigger signal can energize the coil in the first relay, thereby causing the second normally open contact T2 to close and conduct.

[0054] In other embodiments, the trigger module 30 is not limited to including the second coil, but may also be other structures capable of triggering the closure of the second normally open contact T2.

[0055] In one embodiment, the second coil and the first normally open contact T11 are connected in series between the first and second pins of the first input terminal IN1.

[0056] like Figure 2 As shown, the second control module 22 includes a third normally closed contact NC3. The second coil, the third normally closed contact NC3, and the first normally open contact T11 are connected in series between the first and second pins of the first input terminal IN1. The trigger signal includes a second trigger signal. The trigger module is also configured to trigger the third normally closed contact to open under the control of the second trigger signal; in other words, the third normally closed contact NC3 is configured to open when the trigger signal is the second trigger signal.

[0057] When the first power supply 11 is working normally, the first coil is energized, the first normally open contact T11 closes, the first normally closed contact NC1 opens, and the trigger signal is the first trigger signal, which de-energizes the third coil (also called the KM3 coil). The third normally closed contact NC3 closes, causing the two ends of the second coil to connect to the first and second pins of the first input terminal IN1, respectively. Thus, the first power supply 11 supplies power to the second coil, which is then energized and operates. The first power supply 11 is connected to the power output terminal OUT through the first control module 21, supplying power to the electrical equipment. When the first power supply 11 fails, the first coil is de-energized, the first normally open contact T11 opens, the first normally closed contact NC1 closes, the trigger signal is the second trigger signal, and the third normally closed contact NC3 opens, ensuring that the second coil is de-energized. The first control module 21 disconnects the first power supply 11 from the power output terminal OUT, and the second power supply 12 is connected to the power output terminal OUT through the second control module 22, achieving electrical interlocking between the first control module 21 and the second control module 22.

[0058] In one embodiment, such as Figure 2 As shown, the second coil can be connected between the first normally open contact T11 and the third normally closed contact NC3. Alternatively, the second coil can be connected between the second pin of the first input terminal IN1 and the first normally open contact T11. In another embodiment, as... Figure 3 As shown, the second coil is connected between the first pin of the first input terminal IN1 and the third normally closed contact NC3. That is, one end of the second coil is connected to the first pin of the first input terminal IN1, and the other end is connected to the third normally closed contact NC3.

[0059] exist Figure 2 In this configuration, at least one second normally open contact T2 can be at least two second normally open contacts T2. The number of second normally open contacts T2 can be determined based on the number of power output terminal OUT pins. For example, if the power output terminal OUT includes a first terminal pin and a second terminal pin, the number of second normally open contacts T2 can be two, namely second normally open contacts T21 and T22. One second normally open contact T21 is located between the first terminal pin (+) of the first input terminal IN1 and the first terminal pin (+) of the power output terminal OUT, and the other second normally open contact T22 is located between the second terminal pin (-) of the first input terminal IN1 and the second terminal pin (-) of the power output terminal OUT. When the power output terminal OUT includes more pins, the number of second normally open contacts T2 can correspond one-to-one with multiple pins, and multiple pins of the first input terminal are connected one-to-one with multiple pins of the power output terminal OUT through multiple second normally open contacts T2.

[0060] like Figure 2As shown, the second control module 22 may include at least one third normally open contact T3, which is located between the second input terminal IN2 and the power output terminal OUT. The trigger module 30 triggers the second control module 22 to close at least one third normally open contact T3. For example, one end of the third normally open contact T3 is connected to the second input terminal IN2, and the other end is connected to the power output terminal OUT. When the third normally open contact T3 is closed and conducting, the second input terminal IN2 is connected to the power output terminal OUT, allowing the second power supply 12 to supply power to the electrical equipment. When the trigger module 30 does not receive a second trigger signal, at least one third normally open contact T3 remains open. By configuring the second control module 22 with at least one third normally open contact T3 that can be triggered by the trigger module 30, the structure of the second control module 22 is simple, the control is simple, and complex control and detection circuits are avoided.

[0061] like Figure 2 As shown, the trigger module 30 may include a third coil, and the trigger signal includes a second trigger signal. The third coil is energized under the control of the second trigger signal, triggering at least one third normally open contact to close; or, in other words, when the trigger signal is the second trigger signal, the third coil is energized, triggering at least one third normally open contact T3 to close. In this structure, the third coil and the third normally open contact T3 can be part of a third contactor. When the trigger module 30 receives the second trigger signal, the second trigger signal energizes the coil in the third contactor, thereby causing the third normally open contact T3 to close and conduct. When the third coil is de-energized, the third normally open contact T3 opens. This structure allows the functions of the third coil and the third normally open contact T3 to be achieved using only one third contactor, further simplifying the structure of the power switching device.

[0062] In other embodiments, a second relay can also be used to implement the functions of the trigger module 30 and the third normally open contact T3. For example, the third coil and at least one third normally open contact T3 are part of the second relay. When the trigger module 30 receives the second trigger signal, the second trigger signal can energize the coil in the second relay, thereby causing the third normally open contact T3 to close and conduct.

[0063] In other embodiments, the trigger module 30 is not limited to including the third coil, but may also be other structures capable of triggering the closure of the third normally open contact T3.

[0064] In one embodiment, the third coil and the first normally closed contact NC1 are connected in series between the first and second pins of the second input terminal IN2.

[0065] like Figure 2As shown, the first control module 21 includes a second normally closed contact NC2, a third coil, the second normally closed contact NC2, and a first normally closed contact NC1 connected in series between the first and second pins of the second input terminal IN2. The trigger signal includes a first trigger signal, and the trigger module is further configured to trigger the second normally closed contact to open under the control of the first trigger signal; or, the second normally closed contact NC2 is configured to open when the trigger signal is the first trigger signal.

[0066] When the first power supply 11 fails, the first coil is de-energized, the first normally open contact T11 opens, the first normally closed contact NC1 closes, and the trigger signal is the second trigger signal, causing the second coil to be de-energized. The second normally closed contact NC2 closes, causing the two ends of the third coil to be connected to the first and second pins of the second input terminal IN2, respectively. The second power supply 12 then supplies power to the third coil, which operates. The second power supply 12 is connected to the power output terminal OUT through the second control module 22, supplying power to the electrical equipment. When the first power supply 11 resumes normal operation, the first coil is energized, the first normally open contact T11 closes and conducts, the first normally closed contact NC1 opens, the trigger signal is the first trigger signal, and the second normally closed contact NC2 opens, ensuring the third coil is de-energized. The second control module 22 disconnects the second power supply 12 from the power output terminal OUT. The first power supply 11 is connected to the power output terminal OUT through the first control module 21, achieving electrical interlocking between the first control module 21 and the second control module 22.

[0067] In one embodiment, such as Figure 2 As shown, the third coil can be connected between the first normally closed contact NC1 and the second normally closed contact NC2. Alternatively, the third coil can be connected between the second pin of the second input terminal IN2 and the first normally closed contact NC1. In another embodiment, as... Figure 3 As shown, the third coil is connected between the first pin of the second input terminal IN2 and the second normally closed contact NC2. That is, one end of the third coil is connected to the first pin of the second input terminal IN2, and the other end is connected to the second normally closed contact NC2.

[0068] exist Figure 2In this configuration, at least one third normally open contact T3 may include at least two third normally open contacts T3. The number of third normally open contacts T3 can be determined based on the number of power output terminal OUT pins. For example, if the power output terminal OUT includes a first terminal pin (+) and a second terminal pin (-), the number of third normally open contacts T3 can be two: one third normally open contact T31 is located between the first terminal pin (+) of the second input terminal IN2 and the first terminal pin (+) of the power output terminal OUT, and the other third normally open contact T32 is located between the second terminal pin (-) of the second input terminal IN2 and the second terminal pin (-) of the power output terminal OUT. When the power output terminal OUT includes more pins, the number of third normally open contacts T3 can correspond one-to-one with multiple pins, and the multiple pins of the second input terminal are respectively connected to the multiple pins of the power output terminal OUT through multiple third normally open contacts T3.

[0069] Figure 3 This is a circuit topology diagram of the power switching device in another embodiment of the present disclosure, such as... Figure 3 The power switching device shown also includes a second contactor and a third contactor. The second contactor includes a second coil, at least one second normally open contact T2, and a second normally closed contact NC2. The third contactor includes a third coil, at least one third normally open contact T3, and a third normally closed contact NC3. The first control module 21 includes at least one second normally open contact T2 and a second normally closed contact NC2 from the second contactor. The second control module 22 includes at least one third normally open contact T3 and a third normally closed contact NC3 from the third contactor. The trigger module 30 includes the second coil of the second contactor and the third coil of the third contactor.

[0070] like Figure 3 As shown, the second coil, the third normally closed contact NC3, and the first normally open contact T11 are connected in series between the first and second pins of the first input terminal IN1. At least one second normally open contact T2 is located between the first input terminal IN1 and the power output terminal OUT. The third coil, the second normally closed contact NC2, and the first normally closed contact NC1 are connected in series between the first and second pins of the second input terminal IN2. At least one third normally open contact T3 is located between the second input terminal IN2 and the power output terminal OUT.

[0071] refer to Figure 3 There are two second normally open contacts T2, namely T21 and T22, and two third normally open contacts T3, namely T31 and T32. The working process of the power switching device is as follows: Figure 4 As shown, combined with Figure 3 and Figure 4 The working principle of the power switching device is briefly described as follows:

[0072] When the first power supply 11 is operating normally, the KM1 coil is energized, the first normally open contact T11 closes, the first normally closed contact NC1 opens, the KM3 coil is de-energized, the third normally closed contact NC3 closes, the KM3 coil is de-energized, and the third normally open contacts T31 and T32 open, disconnecting the connection between the second power supply 12 and the power output terminal OUT. When the KM2 coil is energized, the second normally open contacts T21 and T22 close, connecting the first power supply 11 to the power output terminal OUT, allowing the first power supply 11 to supply power to the electrical equipment or load. When the KM2 coil is energized, the second normally closed contact NC2 opens, further ensuring that the KM3 coil is de-energized, and the third normally open contacts T31 and T32 open, disconnecting the connection between the second power supply 12 and the power output terminal OUT.

[0073] When the first power supply 11 fails, the KM1 coil is de-energized, the first normally open contact T11 opens, and the first normally closed contact NC1 closes. The KM2 coil is de-energized, and the second normally open contacts T21 and T22 open, disconnecting the first power supply 11 from the power output terminal OUT. The de-energization of the KM2 coil causes the second normally closed contact NC2 to close, energizing the KM3 coil. The third normally open contacts T31 and T32 close, connecting the second power supply 12 to the power output terminal OUT, allowing the second power supply 12 to supply power to the electrical equipment or load. The energization of the KM3 coil causes the third normally closed contact NC3 to open, further ensuring the de-energization of the KM2 coil. The second normally open contact T2 opens, disconnecting the first power supply 11 from the power output terminal OUT.

[0074] In one embodiment, the first power supply 11 includes a single-phase AC power supply, and the second power supply 12 includes a single-phase AC power supply. The first terminal (+) of the first power supply 11 is an L terminal and the second terminal (-) is an N terminal. The first terminal (+) of the second power supply 12 is an L terminal and the second terminal (-) is an N terminal. Correspondingly, the first terminal (+) of the power output terminal OUT is an L terminal and the second terminal (-) is an N terminal.

[0075] In another embodiment, the first power supply 11 and the second power supply 12 can both be DC power supplies, with the first terminal pin (+) being the positive terminal pin of the DC power supply and the second terminal pin (-) being the negative terminal pin of the DC power supply.

[0076] Figure 5 This is a circuit topology diagram of a power switching device in another embodiment of the present disclosure, and... Figure 3 The difference in the embodiments is that, in Figure 5In this embodiment, the first power supply 11 is a three-phase AC power supply, and the second power supply 12 is a three-phase AC power supply. Both the first power supply 11 and the second power supply 12 include four pins, namely L1, L2, L3 and N. Correspondingly, the first input terminal IN1 includes four pins, namely L1, L2, L3 and N; the second input terminal IN2 includes four pins, namely L1, L2, L3 and N; and the power output terminal OUT includes four pins, namely L1, L2, L3 and N.

[0077] exist Figure 5 In this configuration, at least one second normally open contact T2 may include four second normally open contacts T21, T22, T23, and T24. The second normally open contact T21 is connected between L1 of the first input terminal IN1 and L1 of the power output terminal OUT; the second normally open contact T22 is connected between L2 of the first input terminal IN1 and L2 of the power output terminal OUT; the second normally open contact T23 is connected between L3 of the first input terminal IN1 and L3 of the power output terminal OUT; and the second normally open contact T24 is connected between N of the first input terminal IN1 and N of the power output terminal OUT.

[0078] At least one third normally open contact T3 may include four third normally open contacts T31, T32, T33, and T34. The third normally open contact T31 is connected between L1 of the second input terminal IN2 and L1 of the power output terminal OUT; the third normally open contact T32 is connected between L2 of the second input terminal IN2 and L2 of the power output terminal OUT; the third normally open contact T33 is connected between L3 of the second input terminal IN2 and L3 of the power output terminal OUT; and the third normally open contact T34 is connected between N of the second input terminal IN2 and N of the power output terminal OUT.

[0079] The power switching device in this embodiment employs a first contactor, a second contactor, and a third contactor, and is configured as follows: Figure 3 or Figure 5 The connection relationship shown enables the first power supply 11 to disconnect the second power supply 12 from the power output terminal OUT when the first power supply 11 is working normally, and the second power supply 12 to disconnect the first power supply 11 from the power output terminal OUT when the second power supply 12 is working, so that only one power supply supplies power to the electrical equipment at any given time. Furthermore, the use of the second contactor and the third contactor to achieve reliable electrical interlocking avoids complex control circuits and detection circuits, and has the advantages of simple structure and simple principle.

[0080] In one embodiment, the first power supply 11 includes an AC power supply, and the first contactor includes a first AC contactor. The second power supply 12 includes an AC power supply. The second contactor includes a second AC contactor, and the third contactor includes a third AC contactor. When the first, second, and third contactors are all AC contactors, the time from energizing the AC contactor coil to contact actuation is generally 10ms to 20ms. This ensures that the load does not stop when switching between the first and second power supplies, thus achieving continuous and uninterrupted power supply to the load.

[0081] The specific specifications and models of the first, second, and third contactors are not limited to AC contactors and can be selected according to actual needs.

[0082] When the first and second power supplies are DC power supplies, the first, second, and third contactors can also be DC contactors, achieving the same technical effect and realizing reliable electrical interlocking.

[0083] Another embodiment of this disclosure provides a power supply system including the power switching device in any embodiment of this disclosure. It also includes a first power supply 11 and a second power supply 12. The first power supply 11 is connected to a first input terminal IN1 of the power switching device, and the second power supply 12 is connected to a second input terminal IN2 of the power switching device.

[0084] Figure 6 The circuit topology diagram of a power supply system in one embodiment of the present disclosure is shown. The power supply system further includes a power processing circuit. The input side of the power processing circuit is connected to the power output terminal OUT of the power switching device. The output side of the power processing circuit is used to supply power to the electrical equipment. The power processing circuit is configured to convert the first voltage output by the power output terminal OUT into a second voltage to provide the second voltage to the electrical equipment.

[0085] Figure 7 This is a circuit topology diagram of a power processing circuit in one embodiment of the present disclosure, as shown below. Figure 7 As shown, the power processing circuit includes a rectifier module, a power factor correction (PFC) boost circuit, and an inverter module. The input side of the rectifier module receives a first voltage, the output side of the rectifier module is connected to the input side of the PFC boost circuit, the output side of the PFC boost circuit is connected to the input side of the inverter module, and the output side of the inverter module is used to output a second voltage. The power processing circuit may also include a filter circuit, which is disposed between the power switching device and the rectifier module, and is used to filter the voltage output by the power switching device. The inverter module may include a first inverter circuit and a second inverter circuit. The output terminal of the first inverter circuit is used to connect to the compressor, and the output terminal of the second inverter circuit is used to connect to the fan.

[0086] For example, Figure 7The filter circuit in the middle includes two input pins, therefore, Figure 7 The power switching device in the middle can adopt Figure 2 or Figure 3 The power switching device shown.

[0087] Figure 8 This is a circuit topology diagram of a power processing circuit in one embodiment of the present disclosure, as shown below. Figure 8 As shown, the power processing circuit also includes a rectifier module, a power factor correction (PFC) boost circuit, an inverter module, and a filter circuit disposed between the power switching device and the rectifier module. Figure 7 The difference in the embodiments is that, Figure 8 In this embodiment, the filter circuit includes four input pins, therefore, Figure 8 The power switching device in the middle can adopt Figure 5 The power switching device shown.

[0088] The power switching device or power supply system disclosed herein has a simple power switching principle, a simple and reliable electrical interlocking structure, and high control stability. It can be widely used in places requiring continuous power supply, such as hospitals, airports, chemical plants, metallurgical plants, data centers, and telecommunications equipment rooms.

[0089] In this disclosure, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this disclosure, "multiple" means two or more, unless otherwise explicitly specified.

[0090] In this disclosure, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this disclosure according to the specific circumstances.

[0091] In this disclosure, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0092] The foregoing disclosure provides many different implementations or examples for carrying out different structures of this disclosure. To simplify this disclosure, the components and arrangements of specific examples are described above. Of course, these are merely examples and are not intended to limit this disclosure. Furthermore, reference numerals and / or reference letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various implementations and / or arrangements discussed.

[0093] The above are merely specific embodiments of this disclosure, but the scope of protection of this disclosure is not limited thereto. Any person skilled in the art can easily conceive of various variations or substitutions within the technical scope disclosed in this disclosure, and these should all be included within the scope of protection of this disclosure. Therefore, the scope of protection of this disclosure should be determined by the scope of the claims.

Claims

1. A power switching device, characterized in that, The power switching device includes a first input terminal, a second input terminal, and a power output terminal. The first input terminal is used to connect to the power supply pin of a first power supply, and the second input terminal is used to connect to the power supply pin of a second power supply. The power switching device further includes: The first contactor includes a first coil, a first normally open contact, and a first normally closed contact. The two ends of the first coil are respectively connected to the first pole pin and the second pole pin of the first input terminal. The first control module is connected to the first input terminal and the power output terminal; The second control module is connected to the second input terminal and the power output terminal; A trigger module is connected to the first normally open contact and the first normally closed contact. The trigger module is configured to receive two different sets of trigger signals from the first normally open contact and the first normally closed contact according to the energization state of the first coil, and selectively trigger the first control module to connect the first input terminal to the power output terminal under the control of the trigger signals, or trigger the second control module to connect the second input terminal to the power output terminal.

2. The power switching device according to claim 1, characterized in that, One end of the first normally open contact is connected to the trigger module, and the other end is connected to the second pin of the first input terminal; one end of the first normally closed contact is connected to the trigger module, and the other end is connected to the second pin of the second input terminal.

3. The power switching device according to claim 1, characterized in that, The first control module includes at least one second normally open contact, which is disposed between the first input terminal and the power output terminal. The trigger module triggers the first control module to close the at least one second normally open contact.

4. The power switching device according to claim 3, characterized in that, The trigger module includes a second coil, and the trigger signal includes a first trigger signal. The second coil is energized under the control of the first trigger signal and triggers the closure of the at least one second normally open contact.

5. The power switching device according to claim 4, characterized in that, The second control module includes a third normally closed contact. The second coil, the third normally closed contact, and the first normally open contact are connected in series between the first and second pins of the first input terminal. The trigger signal includes a second trigger signal. The trigger module is further configured to trigger the third normally closed contact to open under the control of the second trigger signal.

6. The power switching device according to claim 5, characterized in that, One end of the second coil is connected to the first pole pin of the first input terminal, and the other end is connected to the third normally closed contact.

7. The power switching device according to claim 3, characterized in that, The at least one second normally open contact includes two second normally open contacts, one of which is connected between the first pin of the first input terminal and the first pin of the power output terminal, and the other is connected between the second pin of the first input terminal and the second pin of the power output terminal.

8. The power switching device according to any one of claims 1-7, characterized in that, The second control module includes at least one third normally open contact, which is disposed between the second input terminal and the power output terminal. The trigger module triggers the second control module to close the at least one third normally open contact.

9. The power switching device according to claim 8, characterized in that, The trigger module includes a third coil, and the trigger signal includes a second trigger signal. The third coil is energized under the control of the second trigger signal and triggers the closure of at least one third normally open contact.

10. The power switching device according to claim 9, characterized in that, The first control module includes a second normally closed contact. The third coil, the second normally closed contact, and the first normally closed contact are connected in series between the first and second pins of the second input terminal. The trigger signal includes a first trigger signal. The trigger module is further configured to trigger the second normally closed contact to open under the control of the first trigger signal.

11. The power switching device according to claim 10, characterized in that, One end of the third coil is connected to the first pole pin of the second input terminal, and the other end is connected to the second normally closed contact.

12. The power switching device according to claim 8, characterized in that, The at least one third normally open contact includes two third normally open contacts, one of which is connected between the first pin of the second input terminal and the first pin of the power output terminal, and the other third normally open contact is connected between the second pin of the second input terminal and the second pin of the power output terminal.

13. The power switching device according to any one of claims 1-7, characterized in that, It also includes a second contactor and a third contactor. The second contactor includes a second coil, at least one second normally open contact, and a second normally closed contact. The third contactor includes a third coil, at least one third normally open contact, and a third normally closed contact. The first control module includes the second normally open contact and the second normally closed contact of the second contactor. The second control module includes the third normally open contact and the third normally closed contact of the third contactor. The triggering module includes the second coil and the third coil. The second coil, the third normally closed contact, and the first normally open contact are connected in series between the first pole pin and the second pole pin of the first input terminal, and the at least one second normally open contact is disposed between the first input terminal and the power output terminal; The third coil, the second normally closed contact, and the first normally closed contact are connected in series between the first and second pins of the second input terminal, and the at least one third normally open contact is disposed between the second input terminal and the power output terminal.

14. The power switching device according to claim 1, characterized in that, The first power source includes an AC power source, and the first contactor includes a first AC contactor; the second power source includes an AC power source.

15. A power supply system, characterized in that, Includes the power switching device according to any one of claims 1-14.

16. The power supply system according to claim 15, characterized in that, It also includes a power processing circuit, the input side of which is connected to the power output terminal of the power switching device, the output side of which is used to supply power to the electrical equipment, and the power processing circuit is configured to convert the first voltage output by the power output terminal into a second voltage to provide the second voltage to the electrical equipment.

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