Automatic switching circuit device

Abstract

The present invention relates to an automatic switching circuit device, which is used to automatically switch to bypass power supply after a UPS or DPS host is unplugged. The automatic switching circuit device includes: an external automatic bypass, which is connected in parallel with the UPS or DPS host between the input and output, and includes a first relay capable of controlling the external automatic bypass to be closed or disconnected; and an external automatic bypass control loop, which includes a first part that can be physically plugged and unplugged with the UPS or DPS host and a second part that is physically separated from the UPS or DPS host when the UPS or DPS host is plugged or unplugged, the second part including a drive coil of the first relay, and the first part can connect or disconnect the external automatic bypass control loop when the UPS or DPS host is plugged or unplugged, thereby changing the on or off state of the drive coil of the first relay.

Description

Technical Field

[0001] The invention relates to an automatic switching circuit device. Background Art

[0002] In everyday product applications, many pluggable products and applications are designed for easy maintenance. In most cases, a component is allowed to exit service after being removed. However, in other cases, it is desirable for the entire system to immediately issue an alarm or switch to a different operating mode to ensure continued service. In these cases, a design solution is needed to implement automatic switching when a component is removed.

[0003] In current UPS applications, with the adoption of modular UPSs, the bypass function has been separated from the power module. Automatic bypass requires an auxiliary power supply and control unit, which takes up a lot of space. It also relies on a bypass command from the host computer to switch. If the host computer fails or is unplugged and fails to issue a bypass switch command, the automatic bypass function loses its switching basis and cannot function properly. Some UPSs still require manual switching of the maintenance switch, which is quite troublesome. Misoperation or omission can have serious consequences.

[0004] Currently, some UPS products have their automatic bypass function integrated into the main unit. If the main unit is unplugged, the bypass function is also disconnected. At this point, the UPS must rely on external manual bypass to maintain power to the load. If the user forgets to operate the manual bypass switch, the load loses power, creating a risk of a power outage. The manual bypass switch is typically not located near the main unit's power module interface or within the same cabinet door, making it difficult to operate.

[0005] For example, in traditional UPSs, the automatic bypass function may be integrated with the power circuit or a separate automatic bypass module, depending on the manufacturer's solution. When the main unit or automatic bypass is undergoing maintenance, manual maintenance bypass switching is required to ensure power to the load. This operation requires a specific timeframe and often requires different user interfaces, leading to operational difficulties and potential failures.

[0006] Therefore, it is hoped to provide a device that is independent of host communication, does not require manual timing operation, and can automatically switch to bypass power supply after the UPS host is unplugged. Summary of the Invention

[0007] In response to the above technical problems, the present invention provides an automatic switching circuit device for automatically switching to bypass power supply after a UPS or DPS host is unplugged. The automatic switching circuit device includes: an external automatic bypass, which is connected in parallel with the UPS or DPS host between the input and output, and includes a first relay capable of controlling the external automatic bypass to be closed or disconnected; and an external automatic bypass control loop, which includes a first part that can be physically plugged and unplugged with the UPS or DPS host and a second part that is physically separated from the UPS or DPS host when the UPS or DPS host is plugged and unplugged, the second part including a drive coil of the first relay, and the first part can connect or disconnect the external automatic bypass control loop when the UPS or DPS host is plugged and unplugged, thereby changing the on or off state of the drive coil of the first relay.

[0008] According to a preferred embodiment of the automatic switching circuit device of the present invention, the first relay is a normally closed relay, and the external automatic bypass control circuit is connected to the output power of the UPS or DPS host through the first portion. When the UPS or DPS host is unplugged, the external automatic bypass control circuit is disconnected from the output power of the UPS or DPS host because the first portion is physically unplugged from the UPS or DPS host. This de-energizes the drive coil of the first relay, causing the first relay, a normally closed relay, to close and provide a bypass function.

[0009] Preferably, the external automatic bypass control loop further includes a second relay, which is disposed within the external automatic bypass control loop and is configured to connect or disconnect the external automatic bypass control loop under the instruction of the UPS or DPS host, thereby switching the drive coil of the first relay on or off. The second relay can be disposed within a first portion that can be physically removed along with the UPS or DPS host, or within a second portion of the external automatic bypass control loop that remains after the first portion is removed. Due to the use of the second relay, the automatic switching circuit device of the present invention can not only automatically switch as the UPS or DPS host is plugged in or out, but can also achieve autonomous control when the UPS or DPS host is plugged in.

[0010] According to another preferred embodiment of the automatic switching circuit device of the present invention, the first relay is a normally open relay, and the external automatic bypass control circuit is connected to the auxiliary power supply via the second portion. Preferably, the second portion of the external automatic bypass control circuit includes a controllable circuit configured to de-energize the drive coil of the first relay in the external automatic bypass control circuit when the UPS or DPS is plugged in, and to energize the drive coil of the first relay when the UPS or DPS is unplugged. This controllable circuit is implemented, for example, by a circuit including a transistor or MOS transistor.

[0011] Preferably, the external automatic bypass control loop also includes a second relay for implementing autonomously controlled bypass. The second relay is disposed within the external automatic bypass control loop and is configured to connect or disconnect the external automatic bypass control loop under instructions from the UPS or DPS host, thereby energizing or de-energizing the drive coil of the first relay. The second relay can be disposed within a first portion that can be physically removed along with the UPS or DPS host, or within a second portion of the external automatic bypass control loop that remains after the first portion is removed. The use of the second relay enables autonomous control of the automatic switching circuit device.

[0012] Preferably, the UPS or DPS host also has a parallel working bypass. This working bypass works in parallel with the rectifier and inverter. Depending on the status of the rectifier and inverter and the overall control instructions, it can switch to the working bypass mode to ensure continuous power supply to the load in the event of a host failure; or, to save energy, adopt direct mains power supply (ECO operating mode).

[0013] According to a preferred embodiment of the automatic switching circuit device of the present invention, the plug-in connection between the first portion and the second portion of the external automatic bypass control circuit includes a pair of short pins, the length of which is shorter than the length of the long pins of other wiring that come into contact during the insertion of the UPS or DPS host. Thus, the external automatic switching circuit device is connected to the UPS or DPS host via the long and short pins. During host insertion, the long pin and the long pins of the other wiring are connected first, and the short pins are connected later. During host removal, the short pin is disconnected first, and the long pin and the long pins of the other wiring are disconnected later. This ensures that during the insertion of the UPS or DPS host and when the UPS or DPS host starts up, the external automatic bypass remains in the connected bypass state for a period of time due to the time difference between the long and short pins. By the time the short pins disconnect, the UPS or DPS host has completed startup, thus achieving a seamless switch from external automatic bypass to the UPS or DPS host during the insertion process. Similarly, when the UPS or DPS host is unplugged, the short pin is disconnected first, and the external automatic bypass is connected and starts working first. At this time, since the long pin pair remains in contact, the output of the UPS or DPS host still exists, thereby realizing the parallel operation of the external automatic bypass and the UPS or DPS host in a short time, which ensures that the system output is not interrupted during the switching process.

[0014] According to a preferred embodiment of the automatic switching circuit device of the present invention, the automatic switching circuit device also includes a microswitch linked to the locking device or plug-in / plug-out stroke of the UPS or DPS host, which is used to provide the external automatic bypass control circuit with a command or level signal to change the on / off state of the drive coil of the first relay. This enables the microswitch to trigger the operation of the first relay when the UPS or DPS host is unlocked or during its plug-in / plug-out stroke, thereby achieving a time difference between the connection and / or disconnection of the UPS or DPS host and the external automatic bypass.

[0015] Although the time difference provided in the above two preferred embodiments can also be achieved by a switching instruction sent by the UPS or DPS host before plugging and unplugging when the UPS or DPS host has a control function, it should be understood that the external automatic bypass achieved by the switching instruction and the time difference between the UPS or DPS host when plugging and unplugging are not inherently safe, and may therefore lead to control risks when the instruction is erroneous or no instruction is sent.

[0016] Preferably, the first relay further has a static switch connected in parallel. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 and Figure 2 The following respectively show the general application scenarios of UPS or DPS host under the existing technology;

[0018] Figures 3 to 6 A schematic diagram showing the principle of an automatic switching circuit device according to an embodiment of the present invention when used in combination with a UPS or DPS host;

[0019] Figures 7 to 9 A schematic diagram showing the principle of an automatic switching circuit device according to another embodiment of the present invention when used in combination with a UPS or DPS host;

[0020] Figure 10 The diagram schematically illustrates the principle of a time difference between a UPS or DPS host and the automatic switching circuit device during the plugging and unplugging process due to the length of the pins in the automatic switching circuit device according to one embodiment of the present invention.

[0021] Figure 11 FIG. 3 schematically shows a portion of an automatic switching circuit device having a short pin, which delays the automatic switching circuit device from being switched on and off relative to a UPS or DPS host. DETAILED DESCRIPTION

[0022] The present invention will be described in detail below with reference to the accompanying drawings, which are only used to explain the present invention and are not to be construed as limiting the present invention.

[0023] Figure 1 and Figure 2 The following are general application scenarios of UPS or DPS host under the existing technology. In order to overcome the defects in the existing technology, Figures 3 to 6 and Figures 7 to 9 Two groups of embodiments of the automatic switching circuit device of the present invention are respectively shown.

[0024] exist Figure 3 In the diagram, the three groups of long pins and one group of short pins on the right side schematically show the physically pluggable UPS or DPS host and the first part of the external automatic bypass control circuit. However, it is obvious that as will be discussed later in conjunction with Figure 10 The long and short pin design is merely a preferred embodiment of the present invention. The UPS or DPS host and the first part of the external automatic bypass control loop shown here are not limited to connection with the long and short pin scheme shown in the figure. Instead, conventional equal-length pins may also be used. In this case, during the plugging and unplugging process, the contacts shown in the figure will be connected and disconnected simultaneously.

[0025] The external automatic bypass is connected and disconnected by the first relay which is a normally closed relay and is connected in parallel with the rectifier and inverter phase of the UPS or DPS host as shown in the figure.

[0026] like Figure 3As shown, the closing and opening of the first relay of the external automatic bypass is controlled by the connection and opening of the external automatic bypass control loop. When the UPS or DPS host and the first part of the external automatic bypass control loop are unplugged as a whole, the external automatic bypass control loop is disconnected from the host output power supply, so that the drive coil of the first relay is de-energized. Since the first relay is a normally closed relay, it is closed and connected, so that the external automatic bypass is connected after the UPS or DPS host and the first part of the external automatic bypass control loop are unplugged as a whole. Conversely, when the UPS or DPS host and the first part of the external automatic bypass control loop are inserted as a whole, the external automatic bypass control loop is connected to the host output power supply, so that the drive coil of the first relay is energized. Since the first relay is a normally closed relay, it is disconnected, so that the external automatic bypass is disconnected after the UPS or DPS host and the first part of the external automatic bypass control loop are inserted as a whole.

[0027] Figure 3 It should be understood that in embodiments not shown, the working bypass can be omitted and the automatic bypass can be used to directly perform the function of the working bypass.

[0028] Figure 4 Shown Figure 3 In a variation of the illustrated embodiment, a second relay controlled by the UPS or DPS host is provided in the first portion of the external automatic bypass control loop. When the UPS or DPS host and the first portion of the external automatic bypass control loop are connected, the UPS or DPS host can still control the connection and disconnection of the external automatic bypass control loop by issuing control commands to the second relay, thereby controlling the disconnection and connection of the external automatic bypass.

[0029] Figure 5 The embodiment shown is Figure 4 Similar, except that Figure 5 There is no working bypass in the system, but the external automatic bypass directly assumes the function of working bypass.

[0030] Figure 6 Another embodiment of the present invention is shown, in which the external automatic bypass is connected and disconnected by a first relay serving as a normally open relay. Accordingly, an auxiliary power supply and controllable circuit are provided in the external automatic bypass control circuit to ensure that when the UPS or DPS host and the first portion of the external automatic bypass control circuit are removed as a whole, the drive coil of the first relay is energized, thereby closing and connecting the first relay serving as a normally open relay, thereby connecting the external automatic bypass. Conversely, when the UPS or DPS host and the first portion of the external automatic bypass control circuit are inserted as a whole, the drive coil of the first relay is de-energized, thereby opening the first relay serving as a normally open relay, thereby disconnecting the external automatic bypass.

[0031] exist Figure 6 In the illustrated embodiment, the first portion is a shorting pin. When the first portion of the UPS or DPS host and the external automatic bypass control circuit are integrated and removed, the insertion and removal of the shorting pin changes the circuit topology, turning the transistor shown in the diagram on and off, thereby controlling the de-energization and re-energization of the drive coil of the first relay. It should be understood that other switching circuits, such as MOS transistor-based switching circuits, can also be used to control the drive coil of the first relay. The details are not further elaborated here.

[0032] Figure 7 Shown in Figure 6 A variation of the embodiment shown in FIG. In which a shorting pin is not used to connect and disconnect the drive coil of the first relay, a similar Figure 4 The second relay controlled by the UPS or DPS host in the illustrated embodiment controls the connection and disconnection of the external automatic bypass control loop by giving control instructions to the second relay by the UPS or DPS host, thereby controlling the connection and disconnection of the external automatic bypass.

[0033] Similarly, if Figure 8 As shown, the second relay can be placed in the second portion of the external automatic bypass control loop, which is physically separate from the first portion. After the UPS or DPS host and the first portion of the external automatic bypass control loop are integrated, the UPS or DPS host issues control commands to the second relay, connecting and disconnecting the second relay's drive coil, triggering the corresponding action of the second relay, thereby connecting or disconnecting the external automatic bypass according to the design.

[0034] Figure 9 Shown with Figure 8 Similar embodiment, except that Figure 9 There is no working bypass in the system, but the external automatic bypass directly assumes the function of working bypass.

[0035] Figure 10 The principle of the time difference between the UPS or DPS host and the automatic switching circuit device during the plug-in and unplugging process due to the long and short pins is further explained in detail in the figure. The short pin in the figure is shown in black and gray shadows. As shown in the figure, when inserted, the UPS or DPS host at the bottom of the figure and the automatic switching circuit device at the top of the figure are close to each other. From left to right in the figure is the time sequence of the insertion process. It can be seen that due to the length difference between the long and short pins, the long pin pair contacts first during insertion, and then the short pin contacts. From right to left is the time sequence of the unplugging process, in which the short pin disconnects first due to its shorter length, and the long pin disconnects later.

[0036] Figure 11FIG2 schematically shows a portion of another embodiment of the automatic switching circuit device of the present invention, wherein the application of a short pin in a controllable circuit is shown, wherein the short pin causes the automatic switching circuit device to be delayed in being connected and disconnected relative to the UPS or DPS host.

[0037] The above describes preferred embodiments of the present invention, but the spirit and scope of the present invention are not limited to the specific contents disclosed herein. Those skilled in the art can arbitrarily combine and expand the above embodiments based on the teachings of the present invention to create more embodiments and applications within the spirit and scope of the present invention. The spirit and scope of the present invention are not limited by the specific embodiments but by the claims.

[0038] Reference Signs List

[0039] 10 Automatic switching circuit device

[0040] 20UPS or DPS host

[0041] 30 external automatic bypass

[0042] 40 External automatic bypass control circuit

[0043] 41 Part 2

[0044] 42 Part 1

Claims

1. An automatic switching circuit device for automatically switching to bypass power supply after a UPS or DPS host is unplugged, characterized in that: The automatic switching circuit device comprises: an external automatic bypass, connected in parallel with the UPS or DPS host between the input and output, and comprising a first relay capable of controlling the external automatic bypass to be closed or opened; and an external automatic bypass control circuit, the external automatic bypass control circuit comprising a first portion that is physically pluggable and unpluggable with the UPS or DPS host and a second portion that is physically separated from the UPS or DPS host when the UPS or DPS host is plugged in or unplugged, the second portion comprising a drive coil of the first relay; The first part can connect or disconnect the external automatic bypass control circuit when the UPS or DPS host is plugged in or out, thereby changing the on or off state of the driving coil of the first relay, wherein, The first relay is a normally closed relay, and the external automatic bypass control loop is connected to the output power of the UPS or DPS host through the first part, or the first relay is a normally open relay, and the external automatic bypass control loop is connected to the auxiliary power supply through the second part.

2. The automatic switching circuit device according to claim 1, characterized in that: The external automatic bypass control loop also includes a second relay, which is arranged in the external automatic bypass control loop and is used to connect or disconnect the external automatic bypass control loop under the instruction of the UPS or DPS host, thereby turning on or off the drive coil of the first relay.

3. The automatic switching circuit device according to claim 2, characterized in that: The second relay is provided in the first portion.

4. The automatic switching circuit device according to claim 2, characterized in that: The second relay is provided in the second portion.

5. The automatic switching circuit device according to claim 1, characterized in that: The UPS or DPS host also has a parallel working bypass.

6. The automatic switching circuit device according to claim 1, characterized in that: The plug-in connection between the first part and the second part of the external automatic bypass control loop includes a pair of short pins, the length of which is shorter than the length of other long pin pairs that contact each other during the insertion process of the UPS or DPS host.

7. The automatic switching circuit device according to claim 1, characterized in that: The automatic switching circuit device also includes a micro switch linked to the locking device or plug-in stroke of the UPS or DPS host, which is used to provide the external automatic bypass control circuit with an instruction or level signal for changing the on or off state of the drive coil of the first relay.

8. The automatic switching circuit device according to claim 1, characterized in that: The first relay further has a static switch connected in parallel.

Images