Automatic switching device for UPS (Uninterrupted Power Supply)

Abstract

The utility model discloses an automatic switching device for a UPS (Uninterrupted Power Supply). The utility model relates to power supply control electronic circuits. Comprising the steps that a first UPS redundant power supply is connected with a load through a first switch and supplies power to the load in a first UPS redundant power supply mode; the second UPS redundant power supply is connected with the load through the second switch and supplies power to the load in a second UPS redundant power supply mode; the input end of the automatic switching unit is respectively connected with the first UPS redundant power supply and the second UPS redundant power supply, and the output end of the automatic switching unit is respectively connected with the first switch and the second switch; the input end of the self-locking and interlocking circuit is connected with the first switch and the second switch, and the output end of the self-locking and interlocking circuit is connected with the automatic switching unit. The power supply mode of the first UPS redundant power supply or the second UPS redundant power supply can be automatically switched, so that the power supply duration is long, the redundant power supplies are in redundant operation, and the operating load equipment is reliably and safely guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of power supply control electronic circuits, and more specifically to a UPS uninterruptible power supply automatic switching device. Background Art

[0002] UPS, or uninterruptible power supply, is a system device that connects a battery (mostly lead-acid maintenance-free battery) to a host computer and converts direct current into mains power through circuits such as the host inverter. It is mainly used to provide a stable and uninterrupted power supply to a single computer, a computer network system, or other power electronic equipment such as solenoid valves and pressure transmitters, so that the load maintains normal operation and protects the load software and hardware from damage. However, the traditional UPS uninterruptible power supply is a separate power supply when in use. When it fails, it will not work properly and will not protect the load.

[0003] In the prior art, such as patent No. 201921078333.0, a UPS fault switching device is disclosed. Although it involves fault switching, it uses a mechanical switch to achieve the self-locking function. The mechanical self-locking switch is large in size and easy to wear due to its mechanical structure. At the same time, it requires a large force to operate. In addition, when a higher switching speed is required, the above-mentioned mechanical self-locking switch is not suitable.

[0004] Therefore, how to provide a UPS uninterruptible power supply automatic switching device is a problem that those skilled in the art need to solve urgently. Utility Model Content

[0005] In view of this, the utility model provides a UPS uninterruptible power supply automatic switching device, which is used to solve the technical problems existing in the above-mentioned prior art.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A UPS uninterruptible power supply automatic switching device, comprising:

[0008] A first UPS redundant power supply, a second UPS redundant power supply, an automatic switching unit, a first switch, a second switch, and a self-locking interlocking circuit;

[0009] Wherein, the first UPS redundant power supply is connected to the load through the first switch, and the load is powered by the first UPS redundant power supply mode;

[0010] The second UPS redundant power supply is connected to the load through the second switch, and the load is powered by the second UPS redundant power supply mode;

[0011] The input end of the automatic switching unit is connected to the first UPS redundant power supply and the second UPS redundant power supply respectively, and the output end of the automatic switching unit is connected to the first switch and the second switch respectively;

[0012] The input end of the self-locking interlocking circuit is connected to the first switch and the second switch respectively, and the output end of the self-locking interlocking circuit is connected to the automatic switching unit.

[0013] Optionally, it also includes: an indicator light group;

[0014] The output end of the automatic switching unit is connected to the indicator light group.

[0015] Optionally, the indicator light group includes: a first indicator light that is on during normal operation, a second indicator light that is on when the first UPS redundant power supply is running, and a third indicator light that is on when the second UPS redundant power supply is running.

[0016] Optionally, the automatic switching unit includes:

[0017] The automatic switching unit comprises:

[0018] voltage detectors, comparators, and drivers;

[0019] The voltage detector is connected to the first UPS redundant power supply and the second UPS redundant power supply respectively;

[0020] The comparator is connected to the voltage detector;

[0021] An input end of the driver is connected to the comparator, and an output end of the driver is connected to the first switch and the second switch respectively.

[0022] Optionally, the self-locking interlocking circuit includes: a first loop and a second loop;

[0023] Wherein, the input of the first loop is connected to the first switch, and the output of the first loop is connected to the automatic switching unit;

[0024] The input of the second loop is connected to the second switch, and the output of the second loop is connected to the automatic switching unit.

[0025] Optionally, the first loop includes: a first diode, a second diode, a first operational amplifier, a first resistor and a second resistor;

[0026] Among them, the anode of the first diode is connected to the first switch and the second input end of the first operational amplifier, the cathode of the first diode is connected to the anode of the second diode and the first input end of the first operational amplifier, the output end of the first operational amplifier is connected to the automatic switching unit, and is connected to the anode of the first diode and the cathode of the second diode through a first resistor; the first resistor and the second resistor are connected in series to ground.

[0027] Optionally, the second loop includes: a third diode, a fourth diode, a second operational amplifier, a third resistor and a fourth resistor;

[0028] Among them, the anode of the third diode is connected to the second switch and the second input end of the second operational amplifier, the cathode of the third diode is connected to the anode of the fourth diode and the first input end of the second operational amplifier, the output end of the second operational amplifier is connected to the automatic switching unit, and is connected to the anode of the third diode and the cathode of the fourth diode through a third resistor; the third resistor and the fourth resistor are connected in series to ground.

[0029] Through the above technical scheme, it can be known that compared with the prior art, the utility model discloses a UPS uninterruptible power supply automatic switching device, which can automatically switch to the power supply mode of the first UPS redundant power supply or the second UPS redundant power supply, so that the power supply duration is long, the redundant power supplies operate redundantly, and the operating load equipment is reliably and safely guaranteed, and the technical problems in the prior art that the UPS power supply itself has a high failure rate and is easy to cause damage to the load software and hardware, and achieves the technical effect of reducing the failure rate of the UPS power supply and reducing the impact on the production process. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0031] Figure 1 It is a schematic diagram of the structure of the utility model;

[0032] Figure 2 This is a schematic diagram of the self-locking interlocking circuit structure provided by the utility model. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0034] See also Figure 1 As shown, the embodiment of the utility model discloses a UPS uninterruptible power supply automatic switching device, comprising:

[0035] A first UPS redundant power supply, a second UPS redundant power supply, an automatic switching unit, a first switch, a second switch, a self-locking interlocking circuit, and an indicator light group.

[0036] In a specific embodiment, the first UPS redundant power supply is connected to the load via a first switch, and the load is powered by the first UPS redundant power supply mode.

[0037] The second UPS redundant power supply is connected to the load via the second switch, and supplies power to the load via the second UPS redundant power supply mode.

[0038] The input end of the automatic switching unit is connected to the first UPS redundant power supply and the second UPS redundant power supply respectively, and the output end of the automatic switching unit is connected to the first switch and the second switch respectively.

[0039] Specifically, the automatic switching unit detects the voltage of the first UPS redundant power supply and the second UPS redundant power supply and automatically switches the first switch or the second switch off, including: the automatic switching unit includes:

[0040] voltage detectors, comparators, and drivers;

[0041] The voltage detector is connected to the first UPS redundant power supply and the second UPS redundant power supply respectively;

[0042] The comparator is connected to the voltage detector;

[0043] The input end of the driver is connected to the comparator, and the output end of the driver is connected to the first switch and the second switch respectively.

[0044] The output end of the automatic switching unit is connected to the indicator light group, which includes: a first indicator light that is lit during normal operation, a second indicator light that is lit when the first UPS redundant power supply is running, and a third indicator light that is lit when the second UPS redundant power supply is running.

[0045] The input end of the self-locking interlocking circuit is connected to the first switch and the second switch respectively, and the output end of the self-locking interlocking circuit is connected to the automatic switching unit.

[0046] Specifically, the output end of the self-locking interlocking circuit is connected to the driver of the automatic switching unit.

[0047] In a specific embodiment, the self-locking interlocking circuit includes: a first loop and a second loop;

[0048] Wherein, the input of the first circuit is connected to the first switch, and the output of the first circuit is connected to the automatic switching unit;

[0049] The input of the second loop is connected to the second switch, and the output of the second loop is connected to the automatic switching unit.

[0050] Optionally, the first loop includes: a first diode, a second diode, a first operational amplifier, a first resistor and a second resistor;

[0051] Among them, the anode of the first diode is connected to the first switch and the second input end of the first operational amplifier, the cathode of the first diode is connected to the anode of the second diode and the first input end of the first operational amplifier, the output end of the first operational amplifier is connected to the automatic switching unit, and is connected to the anode of the first diode and the cathode of the second diode through the first resistor; the first resistor and the second resistor are connected in series to ground.

[0052] Optionally, the second loop includes: a third diode, a fourth diode, a second operational amplifier, a third resistor and a fourth resistor;

[0053] Among them, the anode of the third diode is connected to the second switch and the second input end of the second operational amplifier, the cathode of the third diode is connected to the anode of the fourth diode and the first input end of the second operational amplifier, the output end of the second operational amplifier is connected to the automatic switching unit, and is connected to the anode of the third diode and the cathode of the fourth diode through the third resistor; the third resistor and the fourth resistor are connected in series to ground.

[0054] In a specific embodiment, the working principle of the utility model is: the first UPS redundant power supply and the second UPS redundant power supply are connected in parallel, and the load is powered separately. When the first switch is closed, the second indicator light is on, and when the second switch is closed, the third indicator light is on. The voltage stability of the first UPS redundant power supply or the second UPS redundant power supply when working is detected by the voltage detector. The comparator compares whether the detected voltage is normal. If it is not normal, the first UPS redundant power supply or the second UPS redundant power supply is powered on / off by controlling the opening / closing of the first switch or the second switch, and automatically switches to the power supply mode of the first UPS redundant power supply or the second UPS redundant power supply. Through the self-locking interlocking circuit, it is ensured that when one UPS redundant power supply fails and does not operate, the other UPS redundant power supply remains in operation, avoiding the loss caused by load power outage, and the two UPS redundant power supplies can work alternately, so that the power supply duration is long, the redundant power supplies operate redundantly, and the operating load equipment is reliably and safely guaranteed, solving the technical problem that the UPS power supply itself has a high failure rate in the prior art and is easy to damage the load software and hardware, and achieving the technical effect of reducing the failure rate of the UPS power supply and reducing the impact on the production process.

[0055] For details, see Figure 2 As shown, it is a schematic diagram of the self-locking interlocking circuit structure, a first diode D1, a second diode D2, a third diode D3, a fourth diode D4, a first operational amplifier A, a second operational amplifier B, a first resistor R1, a second resistor R2, a third resistor R3 and a fourth resistor R4.

[0056] The anode of the first diode D1 is connected to the first switch and the second input terminal of the first operational amplifier A, i.e., the forward input terminal; the cathode of the first diode D1 is connected to the anode of the second diode D2 and the first input terminal of the first operational amplifier A, i.e., the reverse input terminal; the output terminal of the first operational amplifier A is connected to the driver of the automatic switching unit; in addition, two series resistors are provided between the output terminal of the first operational amplifier A and the ground, which are connected to the anode of the first diode D1 and the cathode of the second diode D2 through the first resistor R1; the first resistor R1 and the second resistor R2 are connected to the ground in series. The first resistor R1 and the second resistor R2 divide the output level of the first operational amplifier A and transmit it to the second input terminal of the first operational amplifier A, i.e., the forward input terminal; that is, the feedback voltage is transmitted from the connection point of the first resistor R1 and the second resistor R2 to the second input terminal of the first operational amplifier A, i.e., the forward input terminal.

[0057] The anode of the third diode D3 is connected to the second switch and the second input terminal of the second operational amplifier B, i.e., the forward input terminal; the cathode of the third diode D3 is connected to the anode of the fourth diode D4 and the first input terminal of the second operational amplifier B, i.e., the reverse input terminal; the output terminal of the second operational amplifier B is connected to the driver of the automatic switching unit; in addition, two series-connected resistors are provided between the output terminal of the second operational amplifier B and the ground, which are connected to the anode of the third diode D1 and the cathode of the fourth diode D4 through the third resistor R3; the third resistor R3 and the fourth resistor R4 are connected to the ground in series. The third resistor R3 and the fourth resistor R4 divide the output level of the second operational amplifier B and transmit it to the second input terminal of the second operational amplifier B, i.e., the forward input terminal; that is, the feedback voltage is transmitted from the connection point of the third resistor R3 and the fourth resistor R4 to the second input terminal of the second operational amplifier B, i.e., the forward input terminal.

[0058] In a specific embodiment, Figure 2 Each resistor is selected according to the specific situation to ensure reliable operation of the switch.

[0059] In a specific embodiment, the working principle of the above circuit is as follows: when the power is turned on, the output terminal of each operational amplifier outputs a low potential (which can be achieved by adding resistors to divide the voltage, which is not output in the figure). When the first switch or the second switch is closed, the non-inverting input terminal of the corresponding first operational amplifier A or the first operational amplifier B obtains a high potential, which is higher than the voltage of the inverting input terminal by 1.4V (diode voltage drop), and the output becomes high. This embodiment takes the closing of the first switch as an example. At this time, the closed first switch is opened. Due to the feedback of the voltage division of the first resistor R1 and the second resistor R2, the potential of the non-inverting input terminal is still higher than the inverting input terminal, so the output terminal of the first operational amplifier A maintains a high potential. When the second switch is closed, the circuit repeats the above process. At the same time, through the third diode D3 and the fourth diode D4, the potential of the inverting terminal of all operational amplifiers is higher than the potential of the non-inverting input terminal of the corresponding operational amplifier fed back to the feedback branch, so the outputs of other operational amplifiers that have not been triggered are all low (regardless of whether the previous output is high or low). In short, every time the first switch or the second switch is triggered, only the output end of the operational amplifier corresponding to the switch is high level, and the output end of the other operational amplifier is low level, which realizes the self-locking and interlocking function of the switch. It realizes electronic self-locking, holding and interlocking, is not easy to wear, has a high switching speed, and has a low cost due to the use of cheap components and a simple circuit structure.

[0060] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0061] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A UPS uninterruptible power supply automatic switching device, characterized in that: include: A first UPS redundant power supply, a second UPS redundant power supply, an automatic switching unit, a first switch, a second switch, and a self-locking interlocking circuit; Wherein, the first UPS redundant power supply is connected to the load through the first switch, and the load is powered by the first UPS redundant power supply mode; The second UPS redundant power supply is connected to the load through the second switch, and the load is powered by the second UPS redundant power supply mode; The input end of the automatic switching unit is connected to the first UPS redundant power supply and the second UPS redundant power supply respectively, and the output end of the automatic switching unit is connected to the first switch and the second switch respectively; The input end of the self-locking interlocking circuit is connected to the first switch and the second switch respectively, and the output end of the self-locking interlocking circuit is connected to the automatic switching unit.

2. A UPS uninterruptible power supply automatic switching device according to claim 1, characterized in that: Also includes: Indicator light group; The output end of the automatic switching unit is connected to the indicator light group.

3. A UPS uninterruptible power supply automatic switching device according to claim 2, characterized in that: The indicator light group includes: a first indicator light that is on during normal operation, a second indicator light that is on when the first UPS redundant power supply is running, and a third indicator light that is on when the second UPS redundant power supply is running.

4. The UPS automatic switching device according to claim 1, characterized in that: The automatic switching unit comprises: voltage detectors, comparators, and drivers; The voltage detector is connected to the first UPS redundant power supply and the second UPS redundant power supply respectively; The comparator is connected to the voltage detector; An input end of the driver is connected to the comparator, and an output end of the driver is connected to the first switch and the second switch respectively.

5. The UPS automatic switching device according to claim 1, characterized in that: The self-locking interlocking circuit comprises: a first loop and a second loop; Wherein, the input of the first loop is connected to the first switch, and the output of the first loop is connected to the automatic switching unit; The input of the second loop is connected to the second switch, and the output of the second loop is connected to the automatic switching unit.

6. A UPS uninterruptible power supply automatic switching device according to claim 5, characterized in that: The first loop includes: a first diode, a second diode, a first operational amplifier, a first resistor and a second resistor; Among them, the anode of the first diode is connected to the first switch and the second input end of the first operational amplifier, the cathode of the first diode is connected to the anode of the second diode and the first input end of the first operational amplifier, the output end of the first operational amplifier is connected to the automatic switching unit, and is connected to the anode of the first diode and the cathode of the second diode through a first resistor; the first resistor and the second resistor are connected in series to ground.

7. The UPS automatic switching device according to claim 5, characterized in that: The second loop includes: a third diode, a fourth diode, a second operational amplifier, a third resistor and a fourth resistor; Among them, the anode of the third diode is connected to the second switch and the second input end of the second operational amplifier, the cathode of the third diode is connected to the anode of the fourth diode and the first input end of the second operational amplifier, the output end of the second operational amplifier is connected to the automatic switching unit, and is connected to the anode of the third diode and the cathode of the fourth diode through a third resistor; the third resistor and the fourth resistor are connected in series to ground.

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