CN214958861U

CN214958861U - Dual-power switching circuit

Info

Publication number: CN214958861U
Application number: CN202023135491.0U
Authority: CN
Inventors: 彭兴强
Original assignee: Sanchu Co Ltd of China Railway Tunnel Group Co Ltd
Current assignee: Sanchu Co Ltd of China Railway Tunnel Group Co Ltd
Priority date: 2020-12-23
Filing date: 2020-12-23
Publication date: 2021-11-30
Anticipated expiration: 2030-12-23

Abstract

A dual power supply switching circuit is characterized in that a main power supply is electrically connected with a switch K1, a switch K1 is electrically connected with a fuse FU1, and the fuse FU1 is electrically connected with a contactor KM 1; the standby power supply is electrically connected with a switch K2, a switch K2 is electrically connected with a fuse FU2, the fuse FU2 is electrically connected with a contactor KM2, and a contactor KM1 and a contactor KM2 are both electrically connected with a load; the contactor KM3 and the contactor KM4 are electrically connected with the fuse FU 1; the contact FU21 is connected between fuse FU1 and contactor KM1, and the button SB is connected with contact FU21 electrically, and normally open contact KM31 is connected with the button SB electrically, and contact KM41 is connected with contact KM31 electrically, and time relay KT1 is connected with contact KM41 electrically, and auxiliary relay KA is connected with normally closed contact KM11 electrically, and time relay KT2 is connected with auxiliary relay KA electrically. The utility model discloses realize dual supply automatic switch-over.

Description

Dual-power switching circuit

Technical Field

The utility model relates to a mains operated technical field, concretely relates to dual supply switching circuit.

Background

At present, in some important power utilization places, an emergency power supply needs to be additionally arranged, the emergency power supply usually adopts the form of a diesel generator and the like, and when the mains supply is disconnected, the emergency power supply needs to be switched to the generator for power supply. When the common power fails or is in power failure, the common power is automatically switched into the standby power supply through dual power supply switching, so that the equipment can still normally operate. Most common are elevators, fire fighting, surveillance, lighting, etc.

The double-circuit power supply intelligent contactless switch with automatic switching and hot standby functions in the prior art is controlled by a microprocessor and is realized by an IGBT (insulated gate bipolar transistor). The special controller designed by the traditional technology uses the sampling circuit to sample the power supply, so as to judge whether the power supply is normal or not.

The applicant usually directly purchases circuit switching equipment before, the cost is higher, and normal operation of operation can not be guaranteed, so relevant research and development are carried out, the experimental effect is good, the popularization value is higher, the popularization significance is certain in the whole society, the application prospect is good, and patent protection is urgently needed.

SUMMERY OF THE UTILITY MODEL

Therefore, the utility model provides a dual power supply switching circuit can realize stand-by power supply's input or withdraw from because of the trouble (open phase) has a power failure back or the main power supply resumes the back at the main power.

In order to achieve the above object, the present invention provides the following technical solutions: a dual-power switching circuit comprises a main power supply and a standby power supply, and further comprises a switch K1, a switch K2, a fuse FU1, a fuse FU2, a contactor KM1, a contactor KM2, a contactor KM3, a contactor KM4, a time relay KT1, a time relay KT2, an intermediate relay KA and a button SB; the main power supply is electrically connected with the switch K1, the switch K1 is electrically connected with the fuse FU1, and the fuse FU1 is electrically connected with a contactor KM 1; the standby power supply is electrically connected with the switch K2, the switch K2 is electrically connected with the fuse FU2, the fuse FU2 is electrically connected with the contactor KM2, and the contactor KM1 and the contactor KM2 are both electrically connected with a load; the contactor KM3 is electrically connected with one contact of the fuse FU1, and the contactor KM4 is electrically connected with the other contact of the fuse FU 1;

fuse FU21 of fuse FU2 is connected to between fuse FU1 and the contactor KM1, the button SB with fuse auxiliary contact FU21 electricity is connected, a normally open contact KM31 of contactor KM3 with the button SB electricity is connected, a normally open contact KM41 of contactor KM4 with normally open contact KM31 electricity is connected, time relay KT1 with normally open contact KM41 electricity is connected, auxiliary relay KA is connected with a normally closed contact KM11 of contactor KM1 electricity, time relay KT2 with auxiliary relay KA electricity is connected.

As a preferable scheme of the dual power supply switching circuit, the time relay KT2, the contactor KM3 and the contactor KM4 are all connected to a neutral line O.

As a preferable scheme of the double-power switching circuit, a normally open contact KT21 of the time relay KT2 is electrically connected with a coil KM21 of the contactor KM2, and the coil KM21 is connected to a neutral line O.

As a preferable scheme of the dual power supply switching circuit, one coil KA1 of the intermediate relay KA is electrically connected with the time relay KT1, and the coil KA1 is connected to a neutral line O.

As a preferable scheme of the double power supply switching circuit, the other auxiliary contact KM22 of the contactor KM2 is electrically connected with a coil KM12 of the contactor KM1, and the coil KM12 is connected to the neutral line O.

As a preferred solution for a dual power switching circuit, one coil KT11 of the time relay KT1 is connected to the neutral line O.

As a preferable scheme of the double-power switching circuit, an auxiliary contact KM22 is connected in series with a coil KM12, and a time relay KT1 is connected in series with a coil KA 1;

the coil KT11 is connected in parallel with the auxiliary contact KM22 and the coil KM12 which are connected in series; the coil KT11 is also connected in parallel with a time relay KT1 and a coil KA1 which are connected in series.

The utility model has the advantages of as follows: the device is provided with a switch K1, a switch K2, a fuse FU1, a fuse FU2, a contactor KM1, a contactor KM2, a contactor KM3, a contactor KM4, a time relay KT1, a time relay KT2, an intermediate relay KA and a button SB; the main power supply is electrically connected with a switch K1, a switch K1 is electrically connected with a fuse FU1, and a fuse FU1 is electrically connected with a contactor KM 1; the standby power supply is electrically connected with a switch K2, a switch K2 is electrically connected with a fuse FU2, the fuse FU2 is electrically connected with a contactor KM2, and a contactor KM1 and a contactor KM2 are both electrically connected with a load; the contactor KM3 is electrically connected with one contact of the fuse FU1, and the contactor KM4 is electrically connected with the other contact of the fuse FU 1; a fuse auxiliary contact FU21 of the fuse FU2 is connected between the fuse FU1 and the contactor KM1, the button SB is electrically connected with the fuse auxiliary contact FU21, a normally open contact KM31 of the contactor KM3 is electrically connected with the button SB, a normally open contact KM41 of the contactor KM4 is electrically connected with the normally open contact KM31, the time relay KT1 is electrically connected with the normally open contact KM41, the relay KA is electrically connected with a normally closed contact KM11 of the contactor KM1, and the time relay KT2 is electrically connected with the relay KA. The utility model discloses a power failure back is had a power failure because of trouble (open phase) at the main power supply, and the switch-on generator is the load power supply, and when the main power source of work resumes the power supply, resumes the main power source and supply power for the load. And a time relay is added in the scheme for delay control, so that compared with a circuit switching device which is directly purchased, the cost is greatly saved, the normal operation of operation is ensured, automatic switching is realized, the method has a higher popularization value, and has certain popularization significance in the whole society.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It should be apparent that the drawings in the following description are merely exemplary, and that other embodiments can be derived from the drawings provided by those of ordinary skill in the art without inventive effort.

The structure, ratio, size and the like shown in the present specification are only used for matching with the content disclosed in the specification, so as to be known and read by people familiar with the technology, and are not used for limiting the limit conditions which can be implemented by the present invention, so that the present invention has no technical essential significance, and any structure modification, ratio relationship change or size adjustment should still fall within the scope which can be covered by the technical content disclosed by the present invention without affecting the efficacy and the achievable purpose of the present invention.

Fig. 1 is a schematic diagram of a dual power switching circuit provided in an embodiment of the present invention.

Detailed Description

The present invention is described in terms of specific embodiments, and other advantages and benefits of the present invention will become apparent to those skilled in the art from the following disclosure. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Referring to fig. 1, a dual power supply switching circuit is provided, which includes a main power supply and a standby power supply, and further includes a switch K1, a switch K2, a fuse FU1, a fuse FU2, a contactor KM1, a contactor KM2, a contactor KM3, a contactor KM4, a time relay KT1, a time relay KT2, an intermediate relay KA, and a button SB; the main power supply is electrically connected with the switch K1, the switch K1 is electrically connected with the fuse FU1, and the fuse FU1 is electrically connected with a contactor KM 1; the standby power supply is electrically connected with the switch K2, the switch K2 is electrically connected with the fuse FU2, the fuse FU2 is electrically connected with the contactor KM2, and the contactor KM1 and the contactor KM2 are both electrically connected with a load; the contactor KM3 is electrically connected with one contact of the fuse FU1, and the contactor KM4 is electrically connected with the other contact of the fuse FU 1;

In this embodiment, the time relay KT2, the contactor KM3, and the contactor KM4 are all connected to a neutral line O. A normally open contact KT21 of the time relay KT2 is electrically connected to a coil KM21 of the contactor KM2, and the coil KM21 is connected to a neutral line O. A coil KA1 of the intermediate relay KA is electrically connected to the time relay KT1, and a coil KA1 is connected to a neutral line O.

In this embodiment, the other auxiliary contact KM22 of the contactor KM2 is electrically connected to a coil KM12 of the contactor KM1, and the coil KM12 is connected to the neutral line O. A coil KT11 of the time relay KT1 is connected to the neutral line O.

In the embodiment, the auxiliary contact KM22 is connected in series with the coil KM12, and the time relay KT1 is connected in series with the coil KA 1; the coil KT11 is connected in parallel with the auxiliary contact KM22 and the coil KM12 which are connected in series; the coil KT11 is also connected in parallel with a time relay KT1 and a coil KA1 which are connected in series.

The principle of the dual power supply switching circuit in this embodiment is as follows:

when the contactor works, the switch K1 and the switch K2 are both closed, the contactor KM1 is electrified to attract the normally-open main contact of the contactor to be closed, the normally-closed contact is opened, the normally-open contacts of the contactor KM3 and the contactor KM4 are closed, and the main power supply supplies power to the load.

At the moment of switching on the switch K2, the time relay KT2 is electrified and attracted, but before the normally open contact which is closed in a delayed way is switched on, the normally closed contact of the contactor KM1 is disconnected, and the time relay KT2 is cut off and released, so that the time relay KM2 cannot be attracted.

When a main power supply has power failure due to a fault (phase failure), the contactor KM1, the intermediate relay KA and the time relay KT1 are released, a normally open main contact of the time relay KM1 is disconnected, the time relay KM1 and the intermediate relay KA are normally closed and connected, the time relay KT2 is enabled to attract and delay for 1-2 s, the time relay KT2 is enabled to be closed and normally open, the contactor KM2 is enabled to be electrified, a normally open main contact of the contactor KM2 is attracted and connected, a standby power supply supplies power to a load, and meanwhile the contactor KM2 is enabled to be normally closed and disconnected.

When the working power supply recovers to supply power, the time relay KT1 is powered on for timing, after one minute, the time relay KT1 delays to close the normally open contact, the intermediate relay KA is powered on for actuation, the normally closed contact of the intermediate relay KA is disconnected, the time relay KT2 and the contactor KM2 release the normally closed contact of the contactor KM2, the contactor KM1 is powered on for actuation, and the main power supply is recovered to supply power for the load.

The utility model is provided with a switch K1, a switch K2, a fuse FU1, a fuse FU2, a contactor KM1, a contactor KM2, a contactor KM3, a contactor KM4, a time relay KT1, a time relay KT2, an intermediate relay KA and a button SB; the main power supply is electrically connected with a switch K1, a switch K1 is electrically connected with a fuse FU1, and a fuse FU1 is electrically connected with a contactor KM 1; the standby power supply is electrically connected with a switch K2, a switch K2 is electrically connected with a fuse FU2, the fuse FU2 is electrically connected with a contactor KM2, and a contactor KM1 and a contactor KM2 are both electrically connected with a load; the contactor KM3 is electrically connected with one contact of the fuse FU1, and the contactor KM4 is electrically connected with the other contact of the fuse FU 1; a fuse auxiliary contact FU21 of the fuse FU2 is connected between the fuse FU1 and the contactor KM1, the button SB is electrically connected with the fuse auxiliary contact FU21, a normally open contact KM31 of the contactor KM3 is electrically connected with the button SB, a normally open contact KM41 of the contactor KM4 is electrically connected with the normally open contact KM31, the time relay KT1 is electrically connected with the normally open contact KM41, the relay KA is electrically connected with a normally closed contact KM11 of the contactor KM1, and the time relay KT2 is electrically connected with the relay KA. The utility model discloses a power failure back is had a power failure because of trouble (open phase) at the main power supply, and the switch-on generator is the load power supply, and when the main power source of work resumes the power supply, resumes the main power source and supply power for the load. And a time relay is added in the scheme for delay control, so that compared with a circuit switching device which is directly purchased, the cost is greatly saved, the normal operation of the operation is ensured, the high-power automatic switching over 1000KW is realized, the popularization value is high, and the popularization significance is realized in the whole society.

Although the invention has been described in detail with respect to the general description and the specific embodiments, it will be apparent to those skilled in the art that modifications and improvements can be made based on the invention. Therefore, such modifications and improvements are intended to be within the scope of the invention as claimed.

Claims

1. A dual-power switching circuit comprises a main power supply and a standby power supply, and is characterized by further comprising a switch K1, a switch K2, a fuse FU1, a fuse FU2, a contactor KM1, a contactor KM2, a contactor KM3, a contactor KM4, a time relay KT1, a time relay KT2, an intermediate relay KA and a button SB; the main power supply is electrically connected with the switch K1, the switch K1 is electrically connected with the fuse FU1, and the fuse FU1 is electrically connected with a contactor KM 1; the standby power supply is electrically connected with the switch K2, the switch K2 is electrically connected with the fuse FU2, the fuse FU2 is electrically connected with the contactor KM2, and the contactor KM1 and the contactor KM2 are both electrically connected with a load; the contactor KM3 is electrically connected with one contact of the fuse FU1, and the contactor KM4 is electrically connected with the other contact of the fuse FU 1;

2. The dual-power-supply switching circuit of claim 1, wherein the time relay KT2, the contactor KM3 and the contactor KM4 are all connected to a neutral line O.

3. The dual-power-supply switching circuit of claim 1, wherein a normally-open contact KT21 of the time relay KT2 is electrically connected with a coil KM21 of the contactor KM2, and the coil KM21 is connected to a neutral line O.

4. The dual power supply switching circuit of claim 3, wherein a coil KA1 of said intermediate relay KA is electrically connected with said time relay KT1, and coil KA1 is connected to neutral line O.

5. The dual power supply switching circuit of claim 4, wherein the other auxiliary contact KM22 of the contactor KM2 is electrically connected to a coil KM12 of the contactor KM1, and the coil KM12 is connected to the neutral line O.

6. A dual power supply switching circuit as claimed in claim 5, in which one coil KT11 of the time relay KT1 is connected to neutral O.

7. The dual-power-supply switching circuit of claim 6, wherein the auxiliary contact KM22 is connected in series with the coil KM12, and the time relay KT1 is connected in series with the coil KA 1;