Two-way power supply automatic switching power supply circuit

An automatic switching, dual-circuit power supply technology, applied in circuit devices, emergency power supply arrangements, electrical components, etc., can solve the problems of low reliability, complex structure, large size, etc., to achieve simple circuit, small size, reliability high effect

Inactive Publication Date: 2016-09-21
AVIC TECH XIAMEN ELECTRIC POWER TECH CO LTD
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AI-Extracted Technical Summary

Problems solved by technology

[0004] The invention provides a dual-channel power supply automatic switching power supply circuit, which solves the problems of the...
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Abstract

The invention provides a two-way power supply automatic switching power supply circuit, and aims at solving the problems that the original two-way power supply automatic switching power supply circuit is complicated in structure, large in size and low in reliability. The two-way power supply automatic switching power supply circuit comprises an AC power supply A, an AC power supply B, a selection control unit and an interlock control unit, wherein the selection control unit and the interlock control unit are mutually connected; the interlock control unit comprises an AC contactor KM1 and an AC contactor KM2 which are in interlock connection; a normally open contact KM1C of the AC contactor KM1 is connected between a live wire of the AC power supply A and a load in series; a normally open contact KM2C of the AC contactor KM2 is connected between the live wire of the AC power supply B and the load in series; and the selection control unit is used for controlling selection of suction of the normally open contact KM1C of the AC contactor KM1 or the normally open contact KM2C of the AC contactor KM2 and avoiding a short circuit caused by competition of two ways of power supplies when the AC power supply A and the AC power supply B are simultaneously powered on.

Application Domain

Emergency power supply arrangements

Technology Topic

ContactorAC power +6

Image

  • Two-way power supply automatic switching power supply circuit
  • Two-way power supply automatic switching power supply circuit
  • Two-way power supply automatic switching power supply circuit

Examples

  • Experimental program(3)

Example Embodiment

[0028] Example one:
[0029] Reference figure 2 In the present invention, the normally open contact KM1C of the AC contactor KM1 is connected in series between the live wire of the AC power source A and the load, and the normally open contact KM2C of the AC contactor KM2 is connected in series to the AC Between the live wire of the power supply B and the load; one end of the normally closed contact KM1A of the AC contactor KM1 is connected to the neutral line N, and the other end is connected to one end of the coil KM2B of the AC contactor KM2; the other end of the coil KM2B One end is connected to the AC contactor KM3; one end of the normally closed contact KM2A of the AC contactor KM2 is connected to the neutral line N, and the other end is connected to one end of the coil KM1B of the AC contactor KM1. The other end is connected to the live wire of the AC power source A. Thus, the AC contactor KM1 and the AC contactor KM2 form an electrical interlock.
[0030] The normally open contact KM3C of the AC contactor KM3 is connected to the other end of the coil KM2B, one end of the coil KM3B is connected to the neutral line N, and the other end is connected to the live wire of the AC power source B.
[0031] working principle:
[0032] State one:
[0033] When the AC power supply A is energized and the AC power supply B is not energized, the coil KM3B of the AC contactor KM3 is not energized, so the normally open contact KM3C of the AC contactor KM3 is in the disconnected state, causing the coil KM2B of the AC contactor KM2 to fail Power on, so the normally open contact KM2C of the AC contactor KM2 is also in the open state, and the normally closed contact KM2A of the AC contactor KM2 is in the closed state. At this time, the coil KM1B of the AC contactor KM1 is energized due to the closing of KM2A. There is current flowing in the coil KM1B of the AC contactor KM1, the normally closed contact KM1A of the AC contactor KM1 is opened, the normally open contact KM1C of the AC contactor KM1 is closed, and the load works under the power of AC power A;
[0034] At this time, if the AC power source B comes on again, the normally open contact KM3C of the AC contactor KM3 is closed, but at this time the normally closed contact KM1A of the AC contactor KM1 is still in the open state, at this time the coil of the AC contactor KM2 KM2B is not energized, so the normally open contact KM2C of the AC contactor KM2 is still in the disconnected state, ensuring stable power supply from AC power A;
[0035] If the AC power supply A is cut off at this time, the coil KM1B of the AC contactor KM1 loses power, the normally open contact KM1C of the AC contactor KM1 is opened, and the normally closed contact KM1A of the AC contactor KM1 is closed. At this time, the AC contactor KM2 The coil KM2B of the AC contactor is energized, the normally closed contact KM2A of the AC contactor KM2 is opened, and the normally open contact KM2C of the AC contactor KM2 is closed. At this time, the AC power supply B is powered.
[0036] State 2:
[0037] When the AC power supply B is live and the AC power supply A is not live, the normally closed contact KM1A of the AC contactor KM1 is closed, and the normally open contact KM3C of the AC contactor KM3 is closed. At this time, the coil KM2B of the AC contactor KM2 When the power is turned on, the normally open contact KM2C of the AC contactor KM2 is closed, the normally closed contact KM2A of the AC contactor KM2 is disconnected, the normally open contact KM1C of the AC contactor KM1 is in the open state, and the load is supplied by the AC power supply B Down work
[0038] At this time, if the AC power source A comes on again, because the normally closed contact KM2A of the AC contactor KM2 is disconnected, the coil KM1B of the AC contactor KM1 is in open circuit, at this time the normally open contact KM1C of the AC contactor KM1 It is still disconnected, ensuring stable power supply from AC power B.
[0039] If the AC power supply B is cut off at this time, the normally open contact KM3C of the AC contactor KM3 is disconnected, at this time the coil KM2B of the AC contactor KM2 loses power, the normally open contact KM2C of the AC contactor KM2 is disconnected, and the AC contactor The normally closed contact KM2A of KM2 is closed, the coil KM1B of the AC contactor KM1 is energized, the normally closed contact KM1A of the AC contactor KM1 is opened, and the normally open contact KM1C of the AC contactor KM1 is closed. A power supply.
[0040] State 3:
[0041] When AC power supply A and AC power supply B come on at the same time, it takes a while for the coil KM3B of the AC contactor KM3 to excite, and it also takes a while for the normally open contact KM3C to close. Therefore, during the time when the AC contactor KM3 is operating, the AC The AC contactor KM1 in power supply A acts first. At this time, the coil KM1B of the AC contactor KM1 is energized, the normally closed contact KM1A of the AC contactor KM1 is opened, and the normally open contact KM1C of the AC contactor KM1 is closed. AC circuit A takes the lead in supplying power. Due to the electrical interlock, the AC contactor KM2 in AC power supply B does not operate, which avoids the competing actions of AC contactor KM1 and AC contactor KM2 causing an instant short circuit between AC power supply A and AC power supply B.

Example Embodiment

[0042] Embodiment two:
[0043] Reference image 3 The second embodiment is basically the same as the first embodiment. The difference is that the normally open contact of the AC relay RLY1 is connected to the other end of the coil KM2B, and one end of the coil of the AC relay RLY1 is connected to the zero Line N, the other end is connected to the live wire of the AC power source B.
[0044] working principle:
[0045] State one:
[0046] When AC power supply A is energized and AC power supply B is not energized, the coil of AC relay RLY1 is not energized, so the normally open contact of AC relay RLY1 is in the disconnected state, which causes the coil KM2B of AC contactor KM2 to not be energized, so AC The normally open contact KM2C of the contactor KM2 is also in the open state, and the normally closed contact KM2A of the AC contactor KM2 is in the closed state. At this time, the coil KM1B of the AC contactor KM1 is energized due to the closing of KM2A, when the AC contactor KM1 There is current flowing in the coil KM1B of the AC contactor, the normally closed contact KM1A of the AC contactor KM1 is disconnected, and the normally open contact KM1C of the AC contactor KM1 is closed, and the load works under the power of AC power A;
[0047] At this time, if the AC power supply B is powered on again, the normally open contact of the AC relay RLY1 is closed, but at this time the normally closed contact KM1A of the AC contactor KM1 is still in the open state, and the coil KM2B of the AC contactor KM2 is not Power on, so the normally open contact KM2C of the AC contactor KM2 is still in the disconnected state, ensuring stable power supply from the AC power supply A;
[0048] If the AC power supply A is cut off at this time, the coil KM1B of the AC contactor KM1 loses power, the normally open contact KM1C of the AC contactor KM1 is opened, and the normally closed contact KM1A of the AC contactor KM1 is closed. At this time, the AC contactor KM2 The coil KM2B of the AC contactor is energized, the normally closed contact KM2A of the AC contactor KM2 is opened, and the normally open contact KM2C of the AC contactor KM2 is closed. At this time, the AC power supply B is powered.
[0049] State 2:
[0050] When AC power source B is energized and AC power source A is not energized, the normally closed contact KM1A of AC contactor KM1 is closed, and the normally open contact of AC relay RLY1 is closed. At this time, the coil KM2B of AC contactor KM2 is energized , The normally open contact KM2C of the AC contactor KM2 is closed, the normally closed contact KM2A of the AC contactor KM2 is disconnected, the normally open contact KM1C of the AC contactor KM1 is in the open state, and the load is working under the power of AC power supply B ;
[0051] At this time, if the AC power source A comes on again, because the normally closed contact KM2A of the AC contactor KM2 is disconnected, the coil KM1B of the AC contactor KM1 is in open circuit, at this time the normally open contact KM1C of the AC contactor KM1 It is still disconnected, ensuring stable power supply from AC power B.
[0052] If the AC power supply B is cut off at this time, the normally open contact of the AC relay RLY1 is disconnected. At this time, the coil KM2B of the AC contactor KM2 loses power, the normally open contact KM2C of the AC contactor KM2 is disconnected, and the normally open contact of the AC contactor KM2 is disconnected. The normally closed contact KM2A is closed, the coil KM1B of the AC contactor KM1 is energized, the normally closed contact KM1A of the AC contactor KM1 is opened, and the normally open contact KM1C of the AC contactor KM1 is closed. At this time, the AC power supply A is powered .
[0053] State 3:
[0054] When AC power supply A and AC power supply B come on at the same time, it takes a while for the coil of AC relay RLY1 to be excited, and it also takes a while for the normally open contact of AC relay RLY1D to close. Therefore, during the period of AC relay RLY1 action, the AC The AC contactor KM1 in power supply A acts first. At this time, the coil KM1B of the AC contactor KM1 is energized, the normally closed contact KM1A of the AC contactor KM1 is opened, and the normally open contact KM1C of the AC contactor KM1 is closed. AC circuit A takes the lead in supplying power. Due to the electrical interlock, the AC contactor KM2 in AC power supply B does not operate, which avoids the competing actions of AC contactor KM1 and AC contactor KM2 causing an instant short circuit between AC power supply A and AC power supply B.

Example Embodiment

[0055] Embodiment three:
[0056] Reference Figure 4 The third embodiment is basically the same as the second embodiment. The difference is that the selection control unit includes an AC relay RLY2 and an AC relay RLY3. One end of the coil of the RLY2 is connected to the neutral line N, and the other end is connected to the neutral line N. The live wire of the AC power supply B; the normally open contact of the RLY2 is connected to one end of the coil of the AC relay RLY3, and the other end of the coil of the AC relay RLY3 is connected to the neutral wire N; the AC relay RLY3 The normally open contact of is connected to the other end of the coil KM2B.
[0057] Working principle: The working principle of the third embodiment is basically the same as that of the second embodiment. The difference is that the selection control unit is composed of AC relay RLY2 and AC relay RLY3 in series. When the control unit is selected to work, AC relay RLY2 and AC relay RLY3 acts in sequence to increase the subsequent circuit action time to achieve the purpose of delay. In order to avoid the competing actions of AC contactor KM1 and AC contactor KM2, AC power supply A and AC power supply B are short-circuited and provide more time.
[0058] Of course, the number of AC relays in the present invention is not limited to the scope listed in the embodiments of the present invention, and can be further increased to 3, 4, and 5 according to the actual selected relay type and the required delay time. ... as long as the purpose of the present invention can be achieved.
[0059] In the present invention, AC power source A is three-phase AC power, its three live wires are LA1, LA2, LA3, AC power source B is three-phase power, and its three live wires are LB1, LB2, LB3, correspondingly, AC contactor KM1 and AC There are also three normally open contacts of the contactor KM2; of course, when only one or two live wires are used in the AC power supply A or the AC power supply B, the present invention is still applicable.
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