CN204652042U - A kind of dual power supply automatic switching device - Google Patents

Abstract

The utility model discloses a kind of dual power supply automatic switching device, comprise the first dpdt relay (K1), second dpdt relay (K2), 3rd dpdt relay (K3), 4th dpdt relay (K4), 5th dpdt relay (K5), the control coil of described first dpdt relay (K1) is connected with the A phase power supply terminal of the first power supply and B phase power supply terminal respectively, the control coil of described second dpdt relay (K2) is connected with the A phase power supply terminal of the first power supply and C phase power supply terminal respectively, the control coil of described 3rd dpdt relay (K3) is connected with the B phase power supply terminal of the first power supply and C phase power supply terminal respectively, dual power supply automatic switching device of the present utility model, time difference problem when main power source and stand-by power source switching can be overcome, simultaneously by arranging DC supply input, when main power supply has a power failure simultaneously, automatically switch to standby battery to power.

Description

A dual power supply automatic switching device

technical field

The invention relates to a double power supply automatic switching device.

Background technique

The substation is generally equipped with dual power sources of main power supply and backup power supply, so a power switching device is equipped to control and switch between the main power supply and the backup power supply. The existing power switching devices on the market can only switch between the main power supply and the backup power supply. Switching is performed, and the device will stop working when the main power supply and the backup power supply are cut off at the same time, and there may be a time difference during the power switching process, which may cause errors in equipment information collection.

Contents of the invention

In order to solve the problem of equipment information collection error due to time difference in the current power switching process, the utility model proposes a dual power automatic switching device, which can solve the above problems.

A dual-power automatic switching device, comprising a first double-pole double-throw relay (K1), a second double-pole double-throw relay (K2), a third double-pole double-throw relay (K3), a fourth double-pole double-throw relay ( K4), the fifth double-pole double-throw relay (K5), the control coil of the first double-pole double-throw relay (K1) is respectively connected to the A-phase power terminal and the B-phase power terminal of the first power supply, and the second The control coil of the double-pole double-throw relay (K2) is respectively connected with the A-phase power terminal and the C-phase power terminal of the first power supply, and the control coil of the third double-pole double-throw relay (K3) is respectively connected with the B phase power terminal of the first power supply. The phase power supply terminal is connected to the C-phase power supply terminal, the first movable contact of the first double-pole double-throw relay (K1) is connected to the A-phase power supply terminal of the second power supply, and the first double-pole double-throw relay (K1 ) is connected to the first moving contact of the second double pole double throw relay (K2), and the first normally closed contact of the second double pole double throw relay (K2) is connected to the second double pole double throw relay (K2) The first movable contact of the third double-pole double-throw relay (K3) is connected, and the first normally closed contact of the third double-pole double-throw relay (K3) is respectively connected with the fourth double-pole double-throw relay ( The control coil of K4) is connected with one of the input terminals of the fifth double-pole double-throw relay (K5), and the B-phase power supply terminal of the second power supply is respectively connected with the control coil of the fourth double-pole double-throw relay (K4) and the first The other input end of the fifth double-pole double-throw relay (K5) is connected, the first moving contact of the fourth double-pole double-throw relay (K4) is connected with the output power supply A, and the fourth double-pole double-throw relay The second movable contact of (K4) is connected with the output power supply B, the first normally closed contact of the fourth double-pole double-throw relay (K4) is connected with the A-phase power supply terminal of the first power supply, and the fourth The first normally open contact of the double pole double throw relay (K4) is connected with the A phase power supply terminal of the second power supply, and the second normally closed contact of the fourth double pole double throw relay (K4) is connected with the first power supply terminal The B-phase power terminal is connected, the second normally open contact of the fourth double-pole double-throw relay (K4) is connected to the B-phase power terminal of the second power supply, and the fifth double-pole double-throw relay (K5) is connected to the second normally open contact. A moving contact is connected to the third output terminal of the power supply, the first normally closed contact of the fifth double-pole double-throw relay (K5) is connected to the C-phase power terminal of the first power supply, and the fifth double-pole double-throw The first normally open contact of the relay (K5) is connected to the C-phase power supply terminal of the second power supply, and the second normally closed contact of the fifth double-pole double-throw relay (K5) is connected to the third double-pole double-throw The second normally closed contact of the relay (K3) is connected.

Further, the first power supply and the second power supply are three-phase three 100V AC power supplies respectively.

The second moving contact of the first double-pole double-throw relay (K1) is connected to the positive input terminal of the DC power supply, and the second normally-closed contact of the first double-pole double-throw relay (K1) is connected to the first The second moving contact of the two double pole double throw relay (K2) is connected, the second normally closed contact of the second double pole double throw relay (K2) is connected with the second normally closed contact of the third double pole double throw relay (K3) The second movable contact is connected, the second normally closed contact of the third double pole double throw relay (K3) is connected with the second normally closed contact of the fifth double pole double throw relay (K5), and the second normally closed contact of the fifth double pole double throw relay (K5) is connected. The second moving contact of the fifth double-pole double-throw relay (K5) is connected to the output end of the DC power supply.

Further, a 220V DC power is input to the positive input terminal of the DC power supply.

Further, the output end of the DC power supply is connected to the input end of the DC-DC converter.

The dual power supply automatic switching device of the utility model can overcome the time difference problem when switching between the main power supply and the backup power supply. At the same time, by setting the input terminal of the DC power supply, when the main and backup power supplies are powered off at the same time, it will automatically switch to the backup battery for power supply.

Description of drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiment. The drawings are only for the purpose of illustrating a preferred embodiment and are not to be considered as limiting the invention. In the attached picture:

Fig. 1 is a kind of embodiment circuit schematic diagram of a kind of dual power supply automatic switching device that the utility model proposes;

Fig. 2 is a partial circuit schematic diagram of a dual power supply automatic switching device proposed by the utility model.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

Embodiment 1, this embodiment proposes a dual-power automatic switching device, including a first double-pole double-throw relay K1, a second double-pole double-throw relay K2, a third double-pole double-throw relay K3, a fourth double-pole double-throw relay Throwing relay K4, the fifth double-pole double-throw relay K5, the control coil of the first double-pole double-throw relay K1 is respectively connected with the A-phase power terminal UA1 and the B-phase power terminal UB1 of the first power supply, and the second double-pole double-throw The control coil of the knife-double-throw relay K2 is respectively connected to the A-phase power terminal UA1 and the C-phase power terminal UC1 of the first power supply, and the control coil of the third double-pole double-throw relay K3 is respectively connected to the B-phase power terminal of the first power supply. UB1 is connected to the C-phase power terminal UC1, the first movable contact 3 of the first double-pole double-throw relay K1 is connected to the A-phase power terminal UA2 of the second power supply, and the first movable contact 3 of the first double-pole double-throw relay K1 A normally closed contact 8 is connected with the first movable contact 3 of the second double pole double throw relay K2, and the first normally closed contact 8 of the second double pole double throw relay K2 is connected with the third double pole relay K2. The first movable contact 3 of the knife double throw relay K3 is connected, and the first normally closed contact 8 of the third double pole double throw relay K3 is respectively connected with the control coil and the fifth double pole double throw relay K4 of the fourth double pole double throw relay K4. One of the input terminals of the double-pole double-throw relay K5 is connected, and the B-phase power terminal UB2 of the second power supply is respectively connected to the control coil of the fourth double-pole double-throw relay K4 and the other input of the fifth double-pole double-throw relay K5. The first movable contact 3 of the fourth double-pole double-throw relay K4 is connected to the output power A phase UAOUT, and the second movable contact 4 of the fourth double-pole double-throw relay K4 is connected to the output power B phase UBOUT connection, the first normally closed contact 8 of the fourth double-pole double-throw relay K4 is connected to the A-phase power supply terminal UA1 of the first power supply, the first normally open contact of the fourth double-pole double-throw relay K4 7 is connected to the A-phase power terminal UA2 of the second power supply, the second normally closed contact 6 of the fourth double-pole double-throw relay K4 is connected to the B-phase power terminal UB1 of the first power supply, and the fourth double-pole double-throw The second normally open contact 5 of the throw relay K4 is connected to the B-phase power terminal UB2 of the second power supply, and the first movable contact 3 of the fifth double-pole double-throw relay K5 is connected to the third output terminal UCOUT of the power supply, so The first normally closed contact 8 of the fifth double pole double throw relay K5 is connected to the C-phase power supply terminal UC1 of the first power supply, and the first normally open contact 7 of the fifth double pole double throw relay K5 is connected to the second The phase C power supply terminal UC2 of the power supply is connected, and the second normally closed contact 6 of the fifth double pole double throw relay K5 is connected with the second normally closed contact 6 of the third double pole double throw relay K3. Among them, UA1, UB1, and UC1 are the rated three-phase three-100V AC input terminals of the first power supply; UA2, UB2, and UC2 are the rated three-phase three-100V AC input terminals of the second power supply, and the first power supply and the second power supply are respectively the main Power supply, backup power supply. K1, K2, K3, K4, and K5 are double-pole double-throw relays with rated coils of AC100V. The working principle of the dual power supply automatic switching device of the present embodiment is as follows:

When the three-phase alternating current UA1, UB1, UC1 of the first power supply and the three-phase alternating current UA2, UB2, UC2 of the second power supply are all input with 100V alternating current, the coils of the relays K1, K2, and K3 are all energized and closed, K1, K2, The normally open contact of K3 is closed, and the normally closed contacts of K1, K2, and K3 are disconnected. Therefore, the relay coils of K4 and K5 will not be closed if there is no power. The normally closed contact is closed, the second movable contact 4 is connected to the second normally closed contact 6, and the output terminals UAOUT, UBOUT, UCOUT are connected to UA1, UB1, UC1, and the power is supplied by the first power supply.

When the three-phase AC power UA1, UB1, UC1 of the first power supply has no AC power input, and the three-phase AC power UA2, UB2, UC2 of the second power source has 100V AC power input, the coils of the relay K1, K2, K3 have no power, and the two sets of normally closed The contact pulls in, and the No. 3 contact of K1 will conduct with the No. 1 contact of K4. Therefore, the control coils of K4 and K5 relays are respectively connected with UA2 and UB2, and the control coils of K4 and K5 are closed. When the open contacts are closed and the normally closed contacts are disconnected, the output terminals UAOUT, UBOUT, UCOUT are connected to UA2, UB2, UC2 and powered by the second power supply.

The dual-power automatic switching device of this embodiment, when the two power supplies are powered at the same time, is powered by the first power supply of the main power supply, and when the first power supply is powered off, it is instantly switched to Powered by the second power supply, there will be no time difference in the middle.

Preferably, in this embodiment, the second movable contact of the first double-pole double-throw relay K1 is connected to the positive input terminal 220V+ of the DC power supply, and the second normally-closed contact of the first double-pole double-throw relay K1 is It is connected with the second moving contact of the second double pole double throw relay K2, the second normally closed contact of the second double pole double throw relay K2 is connected with the second contact of the third double pole double throw relay K3 The moving contact is connected, the second normally closed contact of the third double pole double throw relay K3 is connected with the second normally closed contact of the fifth double pole double throw relay K5, and the fifth double pole double throw The second moving contact of the relay K5 is connected to the output terminal KDC of the DC power supply. In this embodiment, as shown in FIG. 2 , the output terminal KDC of the DC power supply is connected to the input terminal of the DC-DC converter U6, and outputs a DC voltage of 5V through the change of the DC-DC converter U6.

When the three-phase AC power UA1, UB1, UC1 of the first power supply and the three-phase AC power UA2, UB2, UC2 of the second power supply do not have 100V AC input, when DC220+ and DC220- have power, K1, K2, K3, The control coils of the K4 and K5 relays are not powered on and will not pull in, then the second moving contact of the relay K1 will conduct with the second moving contact of the relay K5, so the DC-DC converter U6 will output +5V DC power supply, the three-phase power output part of the device will be connected to UA1, UB1, UC1 (no electricity), and the DC output +5V and 5V ground output terminals will have 5V DC power output.

It should be noted that the power supply levels of the first power supply, the second power supply, and the DC power supply are lowered sequentially. When the three-phase AC power UA1, UB1, and UC1 of the first power supply are powered, the three-phase AC power UA2, UB2, and UC2 of the second power supply are not. Electricity, when DC220+ and DC220- have electricity, they are powered by the first power supply.

When the three-phase alternating current UA1, UB1, UC1 of the first power supply and the three-phase alternating current UA2, UB2, UC2 of the second power supply have 100V alternating current, whether there is DC220+ input or not, the second moving contact of relay K1 is normally open with it. The contact 5 is closed, therefore, the direct current DC220+ does not supply power, but is powered by the first power supply.

When the three-phase AC UA1, UB1, and UC1 of the first power supply are powered, and UA2, UB2, and UC2 are not powered, regardless of whether there is a DC220+ input, the second moving contact 4 of the relay K1 is pulled in and closed with its normally open contact 5, Therefore, the direct current DC220+ does not provide power, but is powered by the first power source.

When the three-phase alternating current UA1, UB1, and UC1 of the first power supply are not powered, when the three-phase alternating current UA2, UB2, and UC2 of the second power supply are active, and the direct currents DC220+ and DC220- are active, the second power supply supplies power.

The dual power supply automatic switching device of the utility model can overcome the time difference problem when switching between the main power supply and the backup power supply. At the same time, by setting the input terminal of the DC power supply, when the main and backup power supplies are powered off at the same time, it will automatically switch to the backup battery for power supply.

Although the present invention has been described with reference to specific examples, this is for the purpose of illustration only and not limitation of the invention, changes, additions and/or deletions to the embodiments may be made without departing from the scope of the invention.

Claims (5)

1. a dual power supply automatic switching device, it is characterized in that: comprise the first dpdt relay (K1), second dpdt relay (K2), 3rd dpdt relay (K3), 4th dpdt relay (K4), 5th dpdt relay (K5), the control coil of described first dpdt relay (K1) is connected with the A phase power supply terminal of the first power supply and B phase power supply terminal respectively, the control coil of described second dpdt relay (K2) is connected with the A phase power supply terminal of the first power supply and C phase power supply terminal respectively, the control coil of described 3rd dpdt relay (K3) is connected with the B phase power supply terminal of the first power supply and C phase power supply terminal respectively, first moving contact of described first dpdt relay (K1) is connected with the A phase power supply terminal of second source, first normally-closed contact of described first dpdt relay (K1) is connected with the first moving contact of described second dpdt relay (K2), first normally-closed contact of described second dpdt relay (K2) is connected with the first moving contact of described 3rd dpdt relay (K3), first normally-closed contact of described 3rd dpdt relay (K3) is connected with the control coil of described 4th dpdt relay (K4) and a wherein input of the 5th dpdt relay (K5) control coil respectively, the B phase power supply terminal of second source is connected with the control coil of described 4th dpdt relay (K4) and an other input of the 5th dpdt relay (K5) control coil respectively, first moving contact of described 4th dpdt relay (K4) is connected with out-put supply A, second moving contact of described 4th dpdt relay (K4) is connected with out-put supply B, described first normally-closed contact of the 4th dpdt relay (K4) is connected with the A phase power supply terminal of the first power supply, described first normally opened contact of the 4th dpdt relay (K4) is connected with the A phase power supply terminal of second source, described second normally-closed contact of the 4th dpdt relay (K4) is connected with the B phase power supply terminal of the first power supply, described second normally opened contact of the 4th dpdt relay (K4) is connected with the B phase power supply terminal of second source, first moving contact of described 5th dpdt relay (K5) is connected with out-put supply C phase output terminal, described first normally-closed contact of the 5th dpdt relay (K5) is connected with the C phase power supply terminal of the first power supply, described first normally opened contact of the 5th dpdt relay (K5) is connected with the C phase power supply terminal of second source, second normally-closed contact of described 5th dpdt relay (K5) is connected with the second normally-closed contact of described 3rd dpdt relay (K3).

2. dual power supply automatic switching device according to claim 1, is characterized in that: described first power supply and second source are respectively three-phase three 100V AC power.

3. dual power supply automatic switching device according to claim 2, it is characterized in that: the second moving contact of described first dpdt relay (K1) is connected with the electrode input end of DC power supply, second normally-closed contact of described first dpdt relay (K1) is connected with the second moving contact of described second dpdt relay (K2), second normally-closed contact of described second dpdt relay (K2) is connected with the second moving contact of described 3rd dpdt relay (K3), second normally-closed contact of described 3rd dpdt relay (K3) is connected with the second normally-closed contact of described 5th dpdt relay (K5), second moving contact of described 5th dpdt relay (K5) is connected with DC power output end.

4. dual power supply automatic switching device according to claim 3, is characterized in that: the electrode input end input 220V DC power supply of described DC power supply.

5. dual power supply automatic switching device according to claim 4, is characterized in that: described DC power output end is connected with the input of DC-DC converter.