Automatic switching device with double input sources and electric equipment

Abstract

The invention provides an automatic switching device with double input sources and electric equipment. The device comprises a controller, a manual change-over switch, a state change-over switch, a first relay, a second relay, a first switch module and a second switch module, the controller is used for controlling the on-off states of the first relay and the second relay when the state change-over switch is in an off state; when the state change-over switch is in a closed state, if the first relay is in a closed state, when the first contact and the third contact are connected, the first relay is disconnected, and the second relay is closed; if the second relay is in the closed state, when the first contact and the second contact are connected, the second relay is disconnected, and the first relay is closed. According to the device, manual and automatic control of double-input-source switching can be achieved, used parts are simple and low in cost, the cost can be reduced, in the manual state, the situation that the input sources are flashed during manual switching to automatic switching can be avoided through logic control, and continuous and stable power supply to electric equipment is guaranteed.

Description

Technical Field

[0001] The present invention relates to the field of circuit technology, and in particular to an automatic switching device for dual input sources and electrical equipment. Background Art

[0002] Many existing electrical equipment require continuous power supply to ensure stable operation. Therefore, important equipment is usually equipped with multiple input sources. ATS (Automatic transfer switching equipment) is usually used to realize automatic switching of multiple input sources.

[0003] ATS can automatically switch the load circuit from one input source to another (backup) input source to ensure continuous and reliable operation of important loads. However, ATS has high cost and poor economic efficiency. Summary of the invention

[0004] The embodiment of the present invention provides an automatic switching device for dual input sources and an electrical device to solve the problem of high cost of automatic switching devices for dual input sources in the prior art.

[0005] In a first aspect, an embodiment of the present invention provides an automatic switching device for dual input sources, comprising: a controller, a manual switching switch, a state switching switch, a first relay, a second relay, a first switch module, and a second switch module;

[0006] The first ends of the state switching switch, the first relay, and the second relay are all connected to the first input source; the second end of the state switching switch is connected to the first contact of the manual switching switch, and the second contact of the manual switching switch and the second end of the first relay are all connected to the first switch module; the third contact of the manual switching switch and the second end of the second relay are all connected to the second switch module; the first switch module is connected in series between the first input source and the power supply end of the electrical device; the second switch module is connected in series between the second input source and the power supply end of the electrical device;

[0007] The controller is used to control the switching states of the first relay and the second relay when the state switching switch is in an open state; when the state switching switch is in a closed state, if the first relay is in a closed state, then when the first contact is connected to the third contact, the first relay is disconnected and the second relay is closed; if the second relay is in a closed state, then when the first contact is connected to the second contact, the second relay is disconnected and the first relay is closed.

[0008] In a possible implementation, when the controller detects that the state switching switch is disconnected, the controller sends a first control signal to the first relay, or sends a second control signal to the second relay;

[0009] The first relay is closed based on the first control signal;

[0010] The second relay is closed based on the second control signal.

[0011] In a possible implementation manner, both the first control signal and the second control signal are high level signals;

[0012] The controller is also used for sending a high level signal to the first relay if the first input source is detected to be normal when the state switching switch is detected to be disconnected; and sending a high level signal to the second relay if the second input source is detected to be normal.

[0013] In one possible implementation, the controller is also used to, when simultaneously monitoring that both the first input source and the second input source are normal, use the input source with the highest priority between the first input source and the second input source as the first target input source, and send a high-level signal to the relay corresponding to the first target input source.

[0014] In one possible implementation, the controller is also used to send a high-level signal to a relay corresponding to the second target input source if it is detected that the first target input source has a fault and when the second target input source is normal; the second target input source is another input source between the first input source and the second input source except the first target input source.

[0015] In a possible implementation, the first switch module includes a first contactor module and a first input source contactor; the second switch module includes a second contactor module and a second input source contactor;

[0016] The first contactor module is connected in series between the second end of the first relay and the ground, and the first input source contactor is connected in series between the first input source and the power supply end of the electrical device; and when the first contactor module is turned on, the first input source contactor is closed;

[0017] The second contactor module is connected in series between the second end of the second relay and the ground, the second input source contactor is connected in series between the second input source and the power supply end of the electrical device, and when the second contactor module is turned on, the second input source contactor is closed;

[0018] The switching states of the first contactor module and the second contactor module are mutually exclusive.

[0019] In a possible implementation, the first contactor module includes a coil and a normally open contact of a first contactor, a coil and a normally open contact of a second contactor, and a first normally closed contact and a second normally closed contact of a third contactor;

[0020] The coil of the first contactor and the first normally closed contact of the third contactor are connected in series between the second end of the first relay and the ground; the normally open contact of the first contactor, the coil of the second contactor and the normally closed contact of the third contactor are connected in series between the second end of the first relay and the ground; the normally open contact of the second contactor and the coil of the first input source contactor are connected in series between the second end of the first relay and the ground; and the switch of the first input source contactor is connected in series between the first input source and the power supply end of the electrical device;

[0021] The second contactor module includes a coil and a normally open contact of the third contactor, a normally closed contact of the first contactor, and a normally closed contact of the second contactor;

[0022] The coil of the third contactor, the normally closed contact of the second contactor and the normally closed contact of the first contactor are connected in series between the second end of the second relay and the ground; the normally open contact of the third contactor and the coil of the second input source contactor are connected in series between the second end of the second relay and the ground; and the switch of the second input source contactor is connected in series between the second input source and the power supply end of the electrical equipment.

[0023] In a possible implementation, the controller is further used to monitor the duration when the switch state of the control switch corresponding to the target input source is inconsistent with the switch state of the switch module corresponding to the target input source; if the duration exceeds a first preset duration, a timeout alarm message is generated;

[0024] The control switch includes a relay and a manual switching switch; the target input source is any one of the first input source and the second input source.

[0025] In a possible implementation, the manual switch further includes a fourth contact, and the fourth contact is suspended.

[0026] In a second aspect, an embodiment of the present application provides an electrical device, which includes: an automatic switching device for dual input sources as described in the first aspect above.

[0027] The embodiment of the present invention provides an automatic switching device for dual input sources and an electrical equipment, the device comprising a controller, a manual switching switch, a state switching switch, a first relay, a second relay, a first switch module and a second switch module; the controller is used to control the switch states of the first relay and the second relay when the state switching switch is in an open state; when the state switching switch is in a closed state, if the first relay is in a closed state, then when the first contact is connected to the third contact, the first relay is disconnected and the second relay is closed; if the second relay is in a closed state, then when the first contact is connected to the second contact, the second relay is disconnected and the first relay is closed. The above device can realize manual and automatic control of dual input source switching, uses simple and inexpensive components, can reduce costs, and in the manual state, through the above logic control, can avoid the input source flashing when manually switching to automatic, to ensure continuous and stable power supply to the electrical equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0029] Figure 1 It is a structural schematic diagram of an automatic switching device for dual input sources provided by an embodiment of the present invention;

[0030] Figure 2 It is a circuit diagram of an automatic switching device for dual input sources provided by an embodiment of the present invention;

[0031] in, Figure 1-2 The symbols in the table have the following meanings:

[0032] KU, status switching switch; QS1, manual switching switch; KS1, first relay; KS2, second relay; KA1, first input source contactor; KA2, second input source contactor; KM1, first contactor; KM2, second contactor; KM3, third contactor. DETAILED DESCRIPTION

[0033] In the following description, specific details such as specific system structures, technologies, etc. are provided for the purpose of illustration rather than limitation, so as to provide a thorough understanding of the embodiments of the present invention. However, it should be clear to those skilled in the art that the present invention may be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to prevent unnecessary details from obstructing the description of the present invention.

[0034] In the description of the present application specification and the appended claims, the terms "first", "second", "third", etc. are only used to distinguish the descriptions and should not be understood as indicating or implying relative importance.

[0035] References to "one embodiment" or "some embodiments" etc. described in the specification of this application mean that one or more embodiments of the present application include specific features, structures or characteristics described in conjunction with the embodiment. Therefore, the statements "in one embodiment", "in some embodiments", "in some other embodiments", "in some other embodiments", etc. that appear in different places in this specification do not necessarily refer to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized in other ways. The terms "including", "comprising", "having" and their variations all mean "including but not limited to", unless otherwise specifically emphasized in other ways.

[0036] In addition, the “plurality” mentioned in the embodiments of the present application should be interpreted as two or more.

[0037] In order to make the purpose, technical solutions and advantages of the present invention more clear, specific embodiments will be described below in conjunction with the accompanying drawings.

[0038] Figure 1 A schematic diagram of the structure of an automatic switching device for dual input sources provided by an embodiment of the present invention, such as Figure 1 As shown, the automatic switching device of dual input sources includes: a controller, a manual switching switch QS1, a state switching switch KU, a first relay KS1, a second relay KS2, a first switch module 10 and a second switch module 20;

[0039] The first ends of the state switching switch KU, the first relay KS1, and the second relay KS2 are all connected to the first input source; the second end of the state switching switch KU is connected to the first contact of the manual switching switch QS1, and the second contact of the manual switching switch QS1 and the second end of the first relay KS1 are all connected to the first switch module 10; the third contact of the manual switching switch QS1 and the second end of the second relay KS2 are all connected to the second switch module 20; the first switch module 10 is connected in series between the first input source and the power supply end of the electrical device; the second switch module 20 is connected in series between the second input source and the power supply end of the electrical device;

[0040] The controller is used to control the switching states of the first relay KS1 and the second relay KS2 when the state switching switch KU is in the open state; when the state switching switch KU is in the closed state, if the first relay KS1 is in the closed state, then when the first contact is connected to the third contact, the first relay KS1 is disconnected and the second relay KS2 is closed; if the second relay KS2 is in the closed state, then when the first contact is connected to the second contact, the second relay KS2 is disconnected and the first relay KS1 is closed.

[0041] In this embodiment, the input source may be a power source; different input sources may be different sources of electricity, for example, the input source may be a power grid, a power generation device, or an energy storage device. When the state switching switch KU is in a closed state, the user may select the first input source or the second input source to connect to the power-consuming device through the manual switching switch QS1. When the first contact and the second contact of the manual switching switch QS1 are connected, the first input source supplies power to the first switch module 10 through the state switching switch KU, the first contact and the second contact of the manual switching switch QS1, so that the first switch module 10 is turned on, thereby connecting the first input source to the power-consuming device and supplying power to the power-consuming device. When the first contact and the third contact of the manual switching switch QS1 are connected, the first input source supplies power to the second switch module 20 through the state switching switch KU, the first contact and the third contact of the manual switching switch QS1, so that the second switch module 20 is turned on, thereby connecting the second input source to the power-consuming device and supplying power to the power-consuming device.

[0042] When the state switching switch KU is in the disconnected state, the middle route is blocked. At this time, the controller controls the first input source or the second input source to supply power to the electrical device by controlling the on / off state of the first relay KS1 and the second relay KS2. Specifically, when the controller detects the first control signal, it sends the first control signal to the first relay KS1. The first relay KS1 is closed after receiving the first control signal. The first input source supplies power to the first switch module 10 through the first relay KS1, so that the first switch module 10 is turned on, so that the first input source is connected to the electrical device and supplies power to the electrical device. When the controller detects the second control signal, it sends the second control signal to the second relay KS2. The second relay KS2 is closed after receiving the second control signal. The first input source supplies power to the second switch module 20 through the second relay KS2, so that the second switch module 20 is turned on, so that the second input source is connected to the electrical device and supplies power to the electrical device.

[0043] In this embodiment, when the state switching switch KU is converted from the open state to the closed state, the controller monitors whether the closed relay and the manual switching switch QS1 are located on the same side, that is, when the first relay KS1 is closed, the first contact and the second contact of the manual switching switch QS1 are closed, the controller does not act; when the first relay KS1 is closed, the first contact and the third contact of the manual switching switch QS1 are closed, the controller controls the first relay KS1 to be disconnected and controls the second relay KS2 to be closed; when the second relay KS2 is closed, the first contact and the second contact of the manual switching switch QS1 are closed, the controller controls the second relay KS2 to be disconnected and controls the first relay KS1 to be closed; when the second relay KS2 is closed, the first contact and the third contact of the manual switching switch QS1 are closed, the controller does not act. In the process of manually switching the input source, by closing the manual and automatic lines at the same time, the method can avoid the flash of the input source at the moment when the state switching switch KU is converted from the closed state to the open state, ensure the continuous and stable power supply of the electrical equipment, and optimize the user's power consumption experience.

[0044] In this embodiment, the automatic switching device may further include a display device. When the controller detects that the state switching switch KU is changed from an open state to a closed state, the currently closed relay and the recommended input source may be displayed through the display device. The user may select the first input source or the second input source based on the recommended content.

[0045] It can be seen from the above embodiments that the above device can realize manual and automatic control of dual input source switching, and in the manual state, by setting software logic, it can avoid the input source flashing when switching from manual to automatic, thereby ensuring continuous power supply to the electrical equipment. In addition, the dual input source automatic switching device provided in this embodiment only includes a relay and a contactor, and the device is simple and low in cost, which can reduce the cost of realizing the dual input source automatic switching function.

[0046] In a possible implementation, when the controller detects that the state switching switch KU is disconnected, the controller sends a first control signal to the first relay KS1 or sends a second control signal to the second relay KS2;

[0047] The first relay KS1 is closed based on the first control signal;

[0048] The second relay KS2 is closed based on the second control signal.

[0049] In this embodiment, the controller is used to monitor the switching state of the state switching switch KU. When the state switching switch KU is disconnected, the switching state of the first relay and the second relay is no longer controlled based on the power supply state. When the state switching switch KU is closed, the first control signal is sent to the first relay KS1, or the second control signal is sent to the second relay KS2 according to the state of the first input source and the second input source.

[0050] In a possible implementation manner, both the first control signal and the second control signal are high level signals;

[0051] The controller is also used to send a high level signal to the first relay KS1 if the first input source is detected to be normal when the state switching switch KU is detected to be disconnected; and send a high level signal to the second relay KS2 if the second input source is detected to be normal.

[0052] In this embodiment, the controller can monitor the electrical parameters of the input source, and judge the quality of the input source electrical signal based on the input source electrical parameters, and judge the difference in input source signal quality between the first input source and the second input source. If the difference in input source signal quality between the first input source and the second input source is greater than a first preset threshold, the input source with better input source signal quality is used as the first target input source, and a control signal is sent to the relay corresponding to the first target input source; if the difference in input source signal quality between the first input source and the second input source is not greater than the first preset threshold, the input source with higher priority between the first input source and the second input source is selected as the first target input source, and a control signal is sent to the relay corresponding to the first target input source, so as to avoid the problem of frequent switching of input sources due to fluctuations in the quality of the input source electrical signals.

[0053] Specifically, the controller may be connected to a power quality analyzer to obtain the quality of the input source electrical signal.

[0054] Specifically, the controller can also determine the quality of the input source electrical signal based on the voltage and frequency of the input source. When the voltage value of the input source exceeds the over-under voltage value range, or the signal frequency exceeds the over-under frequency range, the input source signal quality is determined to be poor; otherwise, the input source signal quality is determined to be qualified and the signal source is not switched.

[0055] In one possible implementation, the controller is also used to, when simultaneously monitoring that both the first input source and the second input source are normal, use the input source with the highest priority between the first input source and the second input source as the first target input source, and send a high-level signal to the relay corresponding to the first target input source.

[0056] In this embodiment, both the first relay KS1 and the second relay KS2 are closed when a high-level signal is obtained, and are opened when a low-level signal is obtained.

[0057] In one possible implementation, the controller is also used to send a high-level signal to a relay corresponding to the second target input source if it is detected that the first target input source has a fault and when the second target input source is normal; the second target input source is another input source between the first input source and the second input source except the first target input source.

[0058] In this embodiment, if the input source with the highest priority fails and another input source is detected to be normal, a high level signal is sent to the relay corresponding to the other input source to achieve automatic switching of the input source of the electrical equipment.

[0059] In a possible implementation, the first switch module 10 includes a first contactor module and a first input source contactor KA1; the second switch module 20 includes a second contactor module and a second input source contactor KA2;

[0060] The first contactor module is connected in series between the second end of the first relay KS1 and the ground, and the first input source contactor KA1 is connected in series between the first input source and the power supply end of the electrical device; and when the first contactor module is turned on, the first input source contactor KA1 is closed;

[0061] The second contactor module is connected in series between the second end of the second relay KS2 and the ground, the second input source contactor KA2 is connected in series between the second input source and the power supply end of the electrical device, and when the second contactor module is turned on, the second input source contactor KA2 is closed;

[0062] The switching states of the first contactor module and the second contactor module are mutually exclusive.

[0063] In one possible implementation, Figure 2 The circuit diagram of the automatic switching device for dual input sources provided in this embodiment is shown as follows: Figure 2 As shown, the first contactor module includes a coil and a normally open contact of a first contactor KM1, a coil and a normally open contact of a second contactor KM2, and a first normally closed contact and a second normally closed contact of a third contactor KM3;

[0064] The coil of the first contactor KM1 and the first normally closed contact of the third contactor KM3 are connected in series between the second end of the first relay KS1 and the ground; the normally open contact of the first contactor KM1, the coil of the second contactor KM2 and the normally closed contact of the third contactor KM3 are connected in series between the second end of the first relay KS1 and the ground; the normally open contact of the second contactor KM2 and the coil of the first input source contactor KA1 are connected in series between the second end of the first relay KS1 and the ground; and the switch of the first input source contactor KA1 is connected in series between the first input source and the power supply end of the electrical equipment;

[0065] The second contactor module includes a coil and a normally open contact of the third contactor KM3, a normally closed contact of the first contactor KM1, and a normally closed contact of the second contactor KM2;

[0066] The coil of the third contactor KM3, the normally closed contact of the second contactor KM2 and the normally closed contact of the first contactor KM1 are connected in series between the second end of the second relay KS2 and the ground; the normally open contact of the third contactor KM3 and the coil of the second input source contactor KA2 are connected in series between the second end of the second relay KS2 and the ground; and the switch of the second input source contactor KA2 is connected in series between the second input source and the power supply end of the electrical equipment.

[0067] In a possible implementation, the device further includes a fuse;

[0068] The fuse is connected in series between the first input source and the state switching switch KU.

[0069] In this embodiment, by utilizing the normally open contacts and normally closed contacts of the contactor, the switch state interlocking of the first contactor module and the second contactor module can be achieved. When the first contactor module is turned on, since the normally closed contact of the second contactor KM2 is disconnected, the second contactor module cannot be turned on even if the second relay KS2 receives a high-level signal; when the second contactor module is turned on, since the normally closed contact of the third contactor KM3 is disconnected, the first contactor module cannot be turned on even if the first relay KS1 receives a high-level signal. In this way, through the electrical interlocking of the above structure, it can be ensured that only one input source supplies power to the electrical equipment, thereby avoiding damage to the electrical equipment caused by multiple input sources being connected to the electrical equipment at the same time.

[0070] In another possible implementation, the first contactor module includes the coil and normally open contact of the fourth contactor, and the first normally closed contact and the second normally closed contact of the fifth contactor; the second contactor module includes the first normally closed contact and the second normally closed contact of the fourth contactor, the coil and the normally closed contact of the fifth contactor.

[0071] The coil of the fourth contactor and the first normally closed contact of the fifth contactor are connected in series between the second end of the first relay KS1 and the ground, the normally open contact of the fourth contactor, the second normally closed contact of the fifth contactor and the coil of the first input source contactor KA1 are connected in series between the second end of the first relay KS1 and the ground, and the normally open contact of the first input source contactor KA1 is connected in series between the first input source and the power supply end of the electrical equipment.

[0072] The coil of the fifth contactor and the first normally closed contact of the fourth contactor are connected in series between the second end of the second relay KS2 and the ground, the normally open contact of the fifth contactor, the second normally closed contact of the fourth contactor and the coil of the second input source contactor KA2 are connected in series between the second end of the second relay KS2 and the ground, and the normally open contact of the second input source contactor KA2 is connected in series between the second input source and the power supply end of the electrical equipment.

[0073] The above structure can also realize the electrical interlocking of the first contactor module and the second contactor module, ensuring that only one input source supplies power to the electrical device, thereby preventing damage to the electrical device caused by multiple input sources being connected to the electrical device at the same time.

[0074] In one possible implementation, the controller is also used to, when the state switching switch is in the off state, if an input source switching task is detected, delay the closing of another relay other than the target relay for a preset time after the target relay is disconnected; the target relay is any one of the first relay and the second relay.

[0075] In this embodiment, there is a mechanical switching time when the contactor switches. In this embodiment, the controller monitors the closing interval between the two relays, and closes the other relay after one relay is disconnected for a preset time, thereby avoiding sparking.

[0076] In a possible implementation, the controller is also used to continuously generate safety reminder information within a first preset time after the target switch module is disconnected when the state switching switch is in a closed state, and the safety reminder information is used to remind the user not to close another switch module other than the target switch module within the first preset time; the target switch module is any one of the first switch module and the second switch module.

[0077] In a possible implementation, the manual switch QS1 further includes a fourth contact, and the fourth contact is suspended.

[0078] In a possible implementation, the controller is further used to monitor the duration when the switch state of the control switch corresponding to the target input source is inconsistent with the switch state of the switch module corresponding to the target input source; if the duration exceeds a first preset duration, a timeout alarm message is generated;

[0079] The control switch includes a relay and a manual switching switch; the target input source is any one of the first input source and the second input source.

[0080] In this embodiment, the relay corresponding to the first input source is the first relay, corresponding to the first contact and the second contact of the manual switching switch, and the corresponding switch module is the first switch module; the relay corresponding to the second input source is the second relay, corresponding to the first contact and the third contact of the manual switching switch, and the corresponding switch module is the second switch module.

[0081] Specifically, if the controller has controlled the first relay or the second relay to close, and the switch module of the corresponding input source is still in the disconnected state after the relay is closed for the first preset time, a timeout alarm message is generated; if the controller has controlled the first relay or the second relay to open, and the switch module of the corresponding input source is still in the closed state after the relay is opened for the first preset time, a timeout alarm message is generated; the timeout alarm message is used to prompt the user that there is a fault in the automatic switching device.

[0082] If the controller detects that the first switch module is still in the disconnected state after the first contact and the second contact of the manual switch are closed for a first preset time;

[0083] Or, if the controller detects that the first switch module is still in a closed state after the first contact and the second contact of the manual switch are disconnected for a first preset time period;

[0084] Or, if the controller detects that the second switch module is still in the disconnected state after the first contact and the third contact of the manual switch are closed for a first preset time period;

[0085] Or, if the controller detects that the second switch module is still in a closed state after the first contact and the third contact of the manual switch are disconnected for a first preset time period;

[0086] Or, if the controller detects that after the first contact and the fourth contact of the manual switching switch are closed for the first preset time, there is still a switch module in the closed state;

[0087] The controller generates a timeout alarm message.

[0088] In this embodiment, when the state switching switch KU is in a closed state, when the controller detects that the first contact and the fourth contact of the manual switching switch QS1 are closed, if the first relay KS1 is in a closed state, the first relay KS1 is disconnected; if the second relay KS2 is in a closed state, the second relay KS2 is disconnected to stop the first input source and the second input source from supplying power to the electrical equipment.

[0089] In this embodiment, by setting the fourth contact, after the first contact and the second contact of the manual switching switch are disconnected, the first contact and the fourth contact are closed. When the disconnection duration of the first contact and the fourth contact reaches the preset time, the user can close the first contact and the third contact to realize the switching of the dual input sources and avoid the ignition problem caused by the too short switching time of the contactor.

[0090] Specifically, the controller can indicate whether another switch module can be closed through an indicator light, and control the indicator light to light red during the preset time when the target switch module is disconnected to remind the user not to close the other switch module. This embodiment can also display a safety reminder message through the display module to remind the user to close the other switch module after the preset time is reached after the target switch module is disconnected. This embodiment can also continuously control the alarm to ring during the preset time when the target switch module is disconnected to remind the user not to close the other switch module, thereby ensuring the safe switching of the contactor.

[0091] In one possible implementation, when the first input source is a power grid and the second input source is a power generation device, the power grid has a higher priority than the power generation device, and when a power grid abnormality is detected, the power generation device is started. If the power generation device has not started within a preset time after a start signal is sent to the power generation device, it is determined that the power generation device has timed out from starting. If the power generation device has not stopped within a preset time after a shutdown signal is sent to the power generation device, it is determined that the power generation device has timed out from shutting down.

[0092] In addition, after the controller sends a start signal to the generator for a preset time, if the voltage / frequency of the generator is detected to be abnormal, the generator start-up is determined to be abnormal, and generator start-up abnormality information is generated.

[0093] In a second aspect, an embodiment of the present application provides an electrical device, which includes: an automatic switching device for dual input sources as described in the first aspect above.

[0094] In this embodiment, the electrical equipment may be important electrical equipment such as an air conditioning system, a UPS (Uninterruptible Power System) input source, etc. By installing an automatic switching device for dual input sources on the important electrical equipment, not only can the manual and automatic switching of the first input source and the second input source be realized, but also the phenomenon that both the first input source and the second input source are connected to the electrical equipment can be avoided through electrical interlocking. In addition, by using two lines to provide the first input source to the switch module in the manual state, the input source flashing when switching from the manual state to the automatic state can be avoided, thereby ensuring continuous and stable power supply to the electrical equipment. At the same time, the automatic switching device for dual input sources provided in this embodiment can replace the ATS by only using the cooperation of contactors, relays and software logic, which can avoid the use of complex and expensive devices, thereby reducing the implementation cost of the automatic switching function of dual input sources.

[0095] The embodiments described above are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be included in the protection scope of the present invention.

Claims

1. An automatic switching device for dual input sources, characterized in that: include: A controller, a manual switching switch, a state switching switch, a first relay, a second relay, a first switch module and a second switch module; The first ends of the state switching switch, the first relay, and the second relay are all connected to the first input source; the second end of the state switching switch is connected to the first contact of the manual switching switch, and the second contact of the manual switching switch and the second end of the first relay are all connected to the first switch module; the third contact of the manual switching switch and the second end of the second relay are all connected to the second switch module; the first switch module is connected in series between the first input source and the power supply end of the electrical device; the second switch module is connected in series between the second input source and the power supply end of the electrical device; The controller is used to control the switching state of the first relay and the second relay when the state switching switch is in the off state; When the state switching switch is in a closed state, if the first relay is in a closed state, then when the first contact is connected to the third contact, the first relay is disconnected and the second relay is closed; if the second relay is in a closed state, then when the first contact is connected to the second contact, the second relay is disconnected and the first relay is closed.

2. The automatic switching device for dual input sources according to claim 1, characterized in that: When the controller detects that the state switching switch is disconnected, the controller sends a first control signal to the first relay, or sends a second control signal to the second relay; The first relay is closed based on the first control signal; The second relay is closed based on the second control signal.

3. The automatic switching device for dual input sources according to claim 2, characterized in that: The first control signal and the second control signal are both high level signals; The controller is also used for sending a high level signal to the first relay if the first input source is detected to be normal when the state switching switch is detected to be disconnected; and sending a high level signal to the second relay if the second input source is detected to be normal.

4. The automatic switching device for dual input sources according to claim 3, characterized in that: The controller is also used to, when simultaneously monitoring that the first input source and the second input source are both normal, use the input source with the highest priority between the first input source and the second input source as the first target input source, and send a high level signal to the relay corresponding to the first target input source.

5. The automatic switching device for dual input sources according to claim 4, characterized in that: The controller is also used to send a high-level signal to the relay corresponding to the second target input source when it is detected that the first target input source fails and when the second target input source is normal; the second target input source is another input source between the first input source and the second input source except the first target input source.

6. The automatic switching device for dual input sources according to claim 1, characterized in that: The first switch module includes a first contactor module and a first input source contactor; the second switch module includes a second contactor module and a second input source contactor; The first contactor module is connected in series between the second end of the first relay and the ground, and the first input source contactor is connected in series between the first input source and the power supply end of the electrical device; and when the first contactor module is turned on, the first input source contactor is closed; The second contactor module is connected in series between the second end of the second relay and the ground, the second input source contactor is connected in series between the second input source and the power supply end of the electrical device, and when the second contactor module is turned on, the second input source contactor is closed; The switching states of the first contactor module and the second contactor module are mutually exclusive.

7. The automatic switching device for dual input sources according to claim 6, characterized in that: The first contactor module includes a coil and a normally open contact of a first contactor, a coil and a normally open contact of a second contactor, and a first normally closed contact and a second normally closed contact of a third contactor; The coil of the first contactor and the first normally closed contact of the third contactor are connected in series between the second end of the first relay and the ground; the normally open contact of the first contactor, the coil of the second contactor and the second normally closed contact of the third contactor are connected in series between the second end of the first relay and the ground; the normally open contact of the second contactor and the coil of the first input source contactor are connected in series between the second end of the first relay and the ground; and the switch of the first input source contactor is connected in series between the first input source and the power supply end of the electrical device; The second contactor module includes a coil and a normally open contact of the third contactor, a normally closed contact of the first contactor, and a normally closed contact of the second contactor; The coil of the third contactor, the normally closed contact of the second contactor and the normally closed contact of the first contactor are connected in series between the second end of the second relay and the ground; the normally open contact of the third contactor and the coil of the second input source contactor are connected in series between the second end of the second relay and the ground; and the switch of the second input source contactor is connected in series between the second input source and the power supply end of the electrical equipment.

8. The automatic switching device for dual input sources according to any one of claims 1 to 7, characterized in that: The controller is also used to monitor the duration when the switch state of the control switch corresponding to the target input source is inconsistent with the switch state of the switch module corresponding to the target input source; if the duration exceeds a first preset duration, a timeout alarm message is generated; The control switch includes a relay and a manual switching switch; the target input source is any one of the first input source and the second input source.

9. The automatic switching device for dual input sources according to any one of claims 1 to 7, characterized in that: The manual switching switch also includes a fourth contact, and the fourth contact is suspended.

10. An electrical device, characterized in that: include: An automatic switching device for dual input sources as claimed in any one of claims 1 to 9.

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