Dual power automatic switching device

Abstract

The utility model discloses a kind of dual power automatic switching device, the device includes first power supply, second power supply, switching circuit, auxiliary test circuit, power supply switch and voltage measuring device, wherein, the first power supply and second power supply are connected with the one end of switching circuit, the other end of switching circuit is connected with the one end of power supply switch and voltage measuring device respectively, for providing two-way power supply to power supply and in the test, voltage is detected by voltage measuring device;First power supply is also connected with the input end of auxiliary test circuit, the output end of auxiliary test circuit is connected with the other end of power supply switch, for in the test, power supply switch is disconnected, auxiliary test circuit and first power supply form power supply loop. By setting auxiliary test circuit to carry out switching test, ensure that automatic switching reliability and to power supply condition check, improve the stability and security of circuit.

Description

Technical Field

[0001] This utility model belongs to the field of power supply circuit technology, and specifically relates to a dual power supply automatic switching device. Background Technology

[0002] Electrical equipment and facilities are widely used in production and daily life. During these applications, they often require a stable power supply. To ensure power stability, dual power supply systems are frequently employed, typically featuring highly integrated or specialized dual power switching control devices. This increases costs, and the increased use of electronic components also poses risks to equipment stability. Furthermore, reliable power supply requirements ensure timely and reliable power restoration in the event of a single circuit failure. However, existing dual power supply systems do not consider the impact of periodic power switching on equipment, potentially causing damage. Utility Model Content

[0003] To address the aforementioned issues, this invention provides a dual-power automatic switching device that ensures reliable automatic switching and allows for monitoring of the power supply status.

[0004] The purpose of this utility model is to provide a dual-power automatic switching device, including a first power supply, a second power supply, a switching circuit, an auxiliary testing circuit, a power supply switch, and a voltage measuring device.

[0005] The first power supply and the second power supply are both connected to one end of the switching circuit. The other end of the switching circuit is connected to one end of the power supply switch and the voltage measuring device, respectively, to provide power to the two power supplies and to detect the voltage through the voltage measuring device during the switching test.

[0006] The first power supply is also connected to the input terminal of the auxiliary test circuit, and the output terminal of the auxiliary test circuit is connected to the other end of the power supply switch. When the power supply switch is turned off during switching tests, the auxiliary test circuit and the first power supply form a power supply loop.

[0007] Furthermore, the switching circuit includes a first switch, a second switch, a first relay, and a second relay, wherein,

[0008] One end of the first switch is connected to the first power source, and the other end of the first switch is connected to one end of the first relay. The other end of the first relay is connected to the voltage measuring device and one end of the power supply switch, respectively.

[0009] One end of the second switch is connected to the second power source, and the other end of the second switch is connected to one end of the second relay. The other end of the second relay is connected to the three-phase power line of the voltage measuring device and one end of the power supply switch, respectively.

[0010] The first relay includes a first relay coil, a first normally open auxiliary contact, and a first normally closed auxiliary contact. The second relay includes a second relay coil and a second normally closed auxiliary contact. One end of the first relay coil is connected to the U-phase line of the three-phase power supply line at the other end of the first switch, and the other end of the first relay coil is connected to one end of the second normally closed auxiliary contact. The other end of the second normally closed auxiliary contact is connected to the W-phase line of the three-phase power supply line at the other end of the first switch. One end of the second relay coil is connected to the U-phase line of the three-phase power supply line at the other end of the second switch, and the other end of the second relay coil is connected to one end of the first normally closed auxiliary contact. The other end of the first normally closed auxiliary contact is connected to the W-phase line of the three-phase power supply line at the other end of the second switch.

[0011] Furthermore, the auxiliary test circuit includes a third switch and a third relay. One end of the third switch is connected to the first power supply, the other end of the third switch is connected to one end of the third relay, and the other end of the third relay is connected to the other end of the power supply switch.

[0012] The third relay includes a third relay coil and a third normally open auxiliary contact. One end of the third relay coil is connected to the U-phase line of the three-phase power supply line at the other end of the third switch. The other end of the third relay coil is connected to one end of the first normally open auxiliary contact and the third normally open auxiliary contact, respectively. The other ends of the first normally open auxiliary contact and the third normally open auxiliary contact are both connected to the W-phase line of the three-phase power supply line at the other end of the third switch.

[0013] Furthermore, the voltage measuring device includes multiple fuses and a voltage display. One end of each fuse is connected to the corresponding phase of the three-phase power supply line, and the other end is connected to the three-phase voltage display.

[0014] Furthermore, one end of the third relay coil, the other end of the first normally open auxiliary contact and the third normally open auxiliary contact, one end of the first relay coil, the other end of the third normally closed auxiliary contact, one end of the third relay coil, and the other end of the first normally closed auxiliary contact are all connected to the corresponding circuits via fuses.

[0015] Furthermore, it also includes a protection circuit, which includes a protection switch and a grounding protection circuit. One end of the protection switch is connected to the three-phase power supply line, and the other end of the protection switch is connected to one end of the grounding protection circuit, and the other end of the grounding protection circuit is grounded.

[0016] This invention improves the stability and safety of the circuit by setting up an auxiliary test circuit for switching tests, ensuring the reliability of automatic switching and checking the power supply status.

[0017] Other features and advantages of this invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of this invention can be realized and obtained by means of the structures pointed out in the description, claims, and drawings. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 An embodiment of the present invention illustrates an automatic dual-power switching device;

[0020] Figure 2 Another dual-power automatic switching device is shown in an embodiment of this utility model. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0022] like Figure 1 As shown in the illustration, this utility model provides an automatic dual-power switching device. The device includes a first power supply, a second power supply, a switching circuit, an auxiliary testing circuit, a power supply switch, and a voltage measuring device. Both the first and second power supplies are connected to one end of the switching circuit. The other end of the switching circuit is connected to one end of the power supply switch and the voltage measuring device, respectively, to provide power from both sources and to detect the voltage during switching tests. The first power supply is also connected to the input of the auxiliary testing circuit, and the output of the auxiliary testing circuit is connected to the other end of the power supply switch. During switching tests, when the power supply switch is disconnected, the auxiliary testing circuit and the first power supply form a power supply loop. By using the auxiliary testing circuit for switching tests, the reliability of automatic switching and the monitoring of the power supply status are ensured, improving the stability and safety of the circuit.

[0023] Specifically, such as Figure 2The switching circuit includes a first switch 1QF1, a second switch 1QF2, a first relay 1KM1, and a second relay 1KM2. One end of the first switch 1QF1 is connected to the first power supply 1#, and the other end of the first switch 1QF1 is connected to one end of the first relay 1KM1. The other end of the first relay 1KM1 is connected to both the voltage measuring device and one end of the power supply switch 2QF. One end of the second switch 1QF2 is connected to the second power supply 2#, and the other end of the second switch 1QF2 is connected to one end of the second relay 1KM2. The other end of the second relay 1KM2 is connected to both the voltage measuring device and one end of the power supply switch 2QF. The first relay 1KM1 includes a first relay coil (A1, A2), a first normally closed auxiliary contact (31, 32), and a first normally open auxiliary contact (13, 14). The second relay 1KM2... The system includes a second relay coil (A1, A2) and a second normally closed auxiliary contact (31, 32). The A1 terminal of the first relay coil is connected to the U-phase line of the three-phase power supply line between the first switch 1QF1 and the first relay 1KM1. The A2 terminal of the first relay coil is connected to the 32 terminal of the second normally closed auxiliary contact, and the 31 terminal of the second normally closed auxiliary contact is connected to the W-phase line of the three-phase power supply line between the first switch 1QF1 and the first relay 1KM1. Similarly, the A1 terminal of the second relay coil is connected to the U-phase line of the three-phase power supply line between the second switch 1QF2 and the second relay 1KM2. The A2 terminal of the second relay coil is connected to the 32 terminal of the first normally closed auxiliary contact, and the 31 terminal of the first normally closed auxiliary contact is connected to the W-phase line of the three-phase power supply line between the second switch 1QF2 and the second relay 1KM2. In this embodiment, the first relay 1KM1 and the second relay 1KM2 are identical relays, and therefore the markings on the corresponding relay coils and contact terminals are the same.

[0024] The auxiliary test circuit includes a third switch 1QF3 and a third relay 1KM3. One end of the third switch 1QF3 is connected to the first power supply 1#, and the other end of the third switch 1QF3 is connected to one end of the third relay 1KM3. The other end of the third relay 1KM3 is connected to the three-phase power supply line at the other end of the power supply switch 2QF. The other end of the power supply switch 2QF is also connected to the port of the electrical equipment. Figure 2 (U, V, W ports)

[0025] The third relay 1KM3 includes a third relay coil (A1, A2) and a third normally open auxiliary contact (13, 14). The A1 terminal of the third relay coil is connected to the U-phase line of the three-phase power supply line between the third switch 1QF3 and the first relay 1KM3. The A2 terminal of the third relay coil is connected to the 13 terminal of the first normally open auxiliary contact and the third normally open auxiliary contact, respectively. The 14 terminals of the first normally open auxiliary contact and the third normally open auxiliary contact are both connected to the W-phase line of the three-phase power supply line between the third switch 1QF3 and the first relay 1KM3.

[0026] In this embodiment of the invention, the voltage measuring device includes multiple fuses and a voltage display, with each fuse connected to the voltage display. Further, the multiple fuses are 1F27-1F29, with one end of each fuse connected to each phase of the three-phase power supply line (1A, 1B, 1C), and the other end connected to the three-phase voltage display 1PV.

[0027] The A1 terminal of the third relay coil, the 14 terminal of the first normally open auxiliary contact and the third normally open auxiliary contact, the A1 terminal of the first relay coil, the 31 terminal of the second normally closed auxiliary contact, and the A1 terminal of the second relay coil and the 31 terminal of the first normally closed auxiliary contact are all connected to the corresponding circuits via fuses, such as... Figure 2 As shown, terminal A1 of the third relay coil is connected to the U-phase line of the three-phase power supply line through fuse 1F25; terminals 14 of the first normally open auxiliary contact and the third normally open auxiliary contact are connected to the W-phase line of the three-phase power supply line through fuse 1F26; terminal A1 of the first relay coil is connected to the U-phase line of the three-phase power supply line through fuse 1F21; terminal 31 of the second normally closed auxiliary contact is connected to the W-phase line of the three-phase power supply line through fuse 1F22; terminal A1 of the second relay coil is connected to the U-phase line of the three-phase power supply line through fuse 1F23; and terminal 31 of the first normally closed auxiliary contact is connected to the W-phase line of the three-phase power supply line through fuse 1F24.

[0028] In this embodiment of the present invention, the device further includes a protection circuit, which includes a protection switch 1QF and a grounding protection circuit 1FVC. One end of the protection switch 1QF is connected to the three-phase power supply line, and the other end of the protection switch 1QF is connected to one end of the grounding protection circuit 1FVC, and the other end of the grounding protection circuit 1FVC is grounded.

[0029] The aforementioned device is a dual-power automatic switching device with a simple structure and higher reliability, constructed using common electrical components, which reduces or avoids the decline in power supply system reliability caused by problems with the use of power electronic devices.

[0030] In this embodiment of the utility model, U, V, W, 1U, 1V, 1W, L1, L2, L3, 1A, 1B, 1C, etc. in the three-phase power supply line all represent different phases of the three-phase power supply line, and will not be described in detail here.

[0031] In this embodiment of the utility model, the working principle of automatic switching between dual power supplies is as follows: When power supply #1 (AC power supply #1, i.e., the first power supply mentioned above) is energized, the first switch 1QF1 is closed, and the first relay coil of the first relay 1KM1 is energized and attracted through the normally closed auxiliary contacts 32 and 31 of the second relay 1KM2 at the U and W phases of power supply #1, thus forming the starting circuit of the first relay coil of the first relay 1KM1 with a voltage of 380V (volts), thereby disconnecting the normally closed auxiliary contacts 32 and 31 of the first relay 1KM1, locking the 1KM2 relay to prevent it from being attracted, and power supply #1 is powered. If power supply #1 fails, the first relay coil of the first relay 1KM1 is de-energized, and the normally closed auxiliary contacts 32 and 31 of the first relay 1KM1 are closed. When power supply #2 is energized, the second relay coil of the second relay 1KM2 is energized, disconnecting the normally closed auxiliary contacts 32 and 31 of the second relay 1KM2. The second relay coil of the second relay 1KM2 is then energized and energized through the normally closed auxiliary contacts 32 and 31 of the first relay 1KM1 in the U and W phases of power supply #2, forming a 380V (volt) starting circuit for the second relay coil of the second relay 1KM2, thereby locking relay 1KM1 to prevent it from energizing, and power supply #2 is supplied.

[0032] In this embodiment of the invention, the working principle of the dual-power automatic switching test is as follows: When power supply #1 is on, the third switch 1QF3 (test power supply circuit breaker) is closed.

[0033] The control circuit is as follows: Fuse 1F25 receives U-phase line power from power supply #1, which passes through the third relay coil of the third relay 1KM3 and the normally open auxiliary contacts 13 and 14 of the first relay 1KM1 (since power supply #1 is supplied, normally open auxiliary contacts 13 and 14 are closed at this time), and then returns to the W-phase line of power supply #1 via fuse 1F26, forming a starting circuit for the third relay coil of the third relay 1KM3 with a voltage of 380V. The third relay 1KM3 is energized, and the normally open auxiliary contacts 13 and 14 of the third relay 1KM3 are closed, forming a blocking circuit to supply power to the coil of 1KM3, keeping 1KM3 energized. Further, the power supply circuit was tested: power was supplied to the main circuit of power supply #1 via power source #1, third switch 1QF3, and third relay 1KM3. Power supply switch 2QF was disconnected, cutting off the power supply to the dual-power automatic power supply circuit, and the output circuit was powered by the test power supply circuit. Switching operations were performed on the first switch 1QF1 of power source #1 and the second switch 1QF2 of power source #2. The voltage was observed using the voltage display 1PV in the voltage testing device to determine the automatic power supply switching function and check the status of the two power supplies. After completing the switching test, the first switch 1QF1 connected to power source #1 was restored first, i.e., the first switch 1QF1 was closed to ensure main power supply. Then, the second switch 1QF2 connected to power source #2 was restored, power supply switch 2QF was closed, and the third switch 1QF3 (test power supply circuit breaker) was disconnected.

[0034] The aforementioned dual-power automatic transfer switch is applied to electrical systems where equipment and facilities require reliable power supply. The application environment must be able to provide two AC power sources. The device uses common components in its circuitry, with auxiliary circuits working in tandem. The circuit connection is simple, easy to operate, and convenient for inspection and maintenance. This device can effectively and automatically switch between dual power sources to the power system, ensuring the reliability of the power supply. Furthermore, by periodically switching the test circuit, operation can be performed without interrupting power to check the automatic transfer function and power supply status, ensuring the overall system's power supply reliability.

[0035] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A dual power automatic switching device, characterized by comprising: It includes a first power supply, a second power supply, a switching circuit, an auxiliary testing circuit, a power supply switch, and a voltage measuring device, among which, The first power supply and the second power supply are both connected to one end of the switching circuit. The other end of the switching circuit is connected to one end of the power supply switch and the voltage measuring device, respectively, to provide power to the two power supplies and to detect the voltage through the voltage measuring device during the switching test. The first power supply is also connected to the input terminal of the auxiliary test circuit, and the output terminal of the auxiliary test circuit is connected to the other end of the power supply switch. When the power supply switch is turned off during switching tests, the auxiliary test circuit and the first power supply form a power supply loop.

2. The dual power automatic transfer device according to claim 1, characterized in that, The switching circuit includes a first switch, a second switch, a first relay, and a second relay, wherein, One end of the first switch is connected to the first power source, and the other end of the first switch is connected to one end of the first relay. The other end of the first relay is connected to the voltage measuring device and one end of the power supply switch, respectively. One end of the second switch is connected to the second power source, and the other end of the second switch is connected to one end of the second relay. The other end of the second relay is connected to the three-phase power line of the voltage measuring device and one end of the power supply switch, respectively. The first relay includes a first relay coil, a first normally open auxiliary contact, and a first normally closed auxiliary contact. The second relay includes a second relay coil and a second normally closed auxiliary contact. One end of the first relay coil is connected to the U-phase line of the three-phase power supply line at the other end of the first switch, and the other end of the first relay coil is connected to one end of the second normally closed auxiliary contact. The other end of the second normally closed auxiliary contact is connected to the W-phase line of the three-phase power supply line at the other end of the first switch. One end of the second relay coil is connected to the U-phase line of the three-phase power supply line at the other end of the second switch, and the other end of the second relay coil is connected to one end of the first normally closed auxiliary contact. The other end of the first normally closed auxiliary contact is connected to the W-phase line of the three-phase power supply line at the other end of the second switch.

3. The dual power automatic transfer device according to claim 2, wherein The auxiliary test circuit includes a third switch and a third relay. One end of the third switch is connected to the first power supply, the other end of the third switch is connected to one end of the third relay, and the other end of the third relay is connected to the other end of the power supply switch. The third relay includes a third relay coil and a third normally open auxiliary contact. One end of the third relay coil is connected to the U-phase line of the three-phase power supply line at the other end of the third switch. The other end of the third relay coil is connected to one end of the first normally open auxiliary contact and the third normally open auxiliary contact, respectively. The other ends of the first normally open auxiliary contact and the third normally open auxiliary contact are both connected to the W-phase line of the three-phase power supply line at the other end of the third switch.

4. The dual power automatic transfer device according to claim 2, wherein The voltage measuring device includes multiple fuses and a voltage display. One end of each fuse is connected to the corresponding phase of the three-phase power supply line, and the other end is connected to the three-phase voltage display.

5. The dual automatic transfer switch of claim 3, wherein, One end of the third relay coil, the other end of the first normally open auxiliary contact and the third normally open auxiliary contact, one end of the first relay coil, the other end of the third normally closed auxiliary contact, one end of the third relay coil and the other end of the first normally closed auxiliary contact are all connected to the corresponding circuits via fuses.

6. The dual automatic transfer switch of claim 3, wherein, It also includes a protection circuit, which includes a protection switch and a grounding protection circuit. One end of the protection switch is connected to the three-phase power supply line, and the other end of the protection switch is connected to one end of the grounding protection circuit, and the other end of the grounding protection circuit is grounded.

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