CN212343328U - Power supply switching circuit - Google Patents
Power supply switching circuit Download PDFInfo
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- CN212343328U CN212343328U CN202020760197.XU CN202020760197U CN212343328U CN 212343328 U CN212343328 U CN 212343328U CN 202020760197 U CN202020760197 U CN 202020760197U CN 212343328 U CN212343328 U CN 212343328U
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Abstract
The utility model relates to a power supply switching circuit, which is used for providing a variable voltage power supply environment and comprises a power supply input end, a variable voltage unit, a switching unit and a power supply output end; the power supply input end is used for connecting a first voltage, and the voltage transformation unit is used for outputting a second voltage and a third voltage; the switching unit comprises a first contactor, a second contactor, a third contactor and a switching control circuit; the switching control circuit comprises a time relay, a first intermediate relay, a second intermediate relay, a third intermediate relay, a fourth intermediate relay and a fifth intermediate relay; and the power supply output end is used for outputting outwards and providing a variable voltage power supply environment. The utility model discloses a power supply switching circuit thereby realizes change over switch's electric interlocking with lower cost through introducing a plurality of auxiliary relay, can outwards stabilize three kinds of supply voltage of output, has guaranteed power supply safety.
Description
Technical Field
The utility model relates to an electrical equipment power supply technical field, more specifically say, relate to a power supply switching circuit.
Background
Some existing electrical devices are generally required to provide a stable variable voltage power supply environment. Such as a meter burn-in test cabinet, which requires three different supply voltages to be provided, thereby improving the reliability of the test results. For power supply safety, when the power supply voltage is switched, the interlock problem of the multi-way switch is involved. The existing power supply switching circuit generally adopts an intelligent controller capable of outputting a plurality of control signals to control a plurality of intermediate relays and realize electrical interlocking.
However, the cost of the intelligent controller used for realizing the interlocking of the change-over switch of the existing power supply switching circuit is too high, and the algorithm is complex. Thus, the existing power supply switching circuit still needs to be improved.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to solve above-mentioned technical problem, provide a power supply switching circuit, its electric interlocking with lower cost realization change over switch to can outwards stabilize three kinds of supply voltage of output, guarantee power supply safety.
In order to achieve the above purpose, the technical scheme of the utility model is that: a power supply switching circuit is used for providing a variable voltage power supply environment; it includes:
the power supply input end is used for connecting a first voltage;
the input end of the voltage transformation unit is coupled with the power supply input end and outputs a second voltage and a third voltage through the first output end and the second output end of the voltage transformation unit respectively;
the switching unit comprises a first contactor, a second contactor, a third contactor and a switching control circuit; the switching control circuit comprises a time relay, a first intermediate relay, a second intermediate relay, a third intermediate relay, a fourth intermediate relay and a fifth intermediate relay; the time relay is provided with a first time sequence switch and a second time sequence switch which are switched on according to a preset time sequence; a coil of the first intermediate relay, a normally closed contact of the second intermediate relay and a normally closed contact of the third intermediate relay are connected in series and then connected in parallel with a coil of the fourth intermediate relay to form a first branch circuit; a coil of the second intermediate relay, a normally closed contact of the first intermediate relay and a normally closed contact of the third intermediate relay are connected in series and then connected in parallel with a coil of the fifth intermediate relay to form a second branch; a coil of the third intermediate relay, the normally closed contact of the first intermediate relay, the normally closed contact of the second intermediate relay, the normally closed contact of the fourth intermediate relay and the normally closed contact of the fifth intermediate relay are connected in series to form a third branch; the first time sequence switch and the second time sequence switch are respectively connected with the first branch circuit and the second branch circuit in series and are connected with the power supply input end, and the third branch circuit is also connected with the power supply input end; the coils of the first contactor, the second contactor and the third contactor are respectively connected with the power supply input end through the normally open contacts of the first intermediate relay, the second intermediate relay and the third intermediate relay;
and the power supply output end is respectively connected with the first output end, the second output end and the power supply input end through the normally open contacts of the first contactor, the second contactor and the third contactor.
In one embodiment: the first voltage is greater than the second voltage and less than the third voltage.
In one embodiment: and the coil of the time relay is connected with the power supply input end.
In one embodiment: the voltage transformation unit is a double-output transformer.
In one embodiment: the power supply input end is connected with the voltage transformation unit, the switching unit and the power supply output end through the first manual switch.
In one embodiment: the switching unit is connected with the power supply input end through a second manual switch.
Compared with the prior art, the beneficial effects of the utility model reside in that: by introducing the fourth intermediate relay and the fifth intermediate relay and arranging the normally closed contact of the fourth intermediate relay and the fifth intermediate relay in the coil loop of the third intermediate relay, the electric interlocking of the three-way intermediate relay is realized at lower cost under the condition that the time relay only has two control signal outputs, so that the electric interlocking of the three-way contactor is realized, and the power supply safety of the power supply switching circuit is ensured.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a circuit diagram of a power supply switching circuit according to an embodiment of the present invention.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are preferred embodiments of the invention and should not be considered as excluding other embodiments. Based on the embodiment of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative work belong to the protection scope of the present invention.
In the claims, the specification and the drawings, unless otherwise expressly limited, the terms "first," "second," or "third," etc. are used for distinguishing between different elements and not for describing a particular sequence. In the claims, the specification and the drawings, the terms "including", "comprising" and variations thereof, if used, are intended to be inclusive and not limiting. In the claims, the description and the drawings of the present invention, if the term "electrically connected" is used, it is meant to include both direct electrical connection and indirect electrical connection.
Referring to fig. 1, an embodiment of the present invention provides a power supply switching circuit, in which a power supply output end of the power supply switching circuit is used for connecting a load to provide a variable voltage power supply environment. When the power supply switching circuit is applied to the instrument aging test cabinet, the load can be an instrument to be tested.
Specifically, the power supply switching circuit includes: the power supply system comprises a power supply input end, a voltage transformation unit, a switching unit and a power supply output end.
The power supply input end is connected with a first voltage, in this embodiment, the power supply input end includes a live wire end and a zero wire end, and the first voltage is 220V.
The input end of the voltage transformation unit is coupled with the power supply input end and is provided with a first output end and a second output end so as to output a second voltage and a third voltage respectively through the first output end and the second output end. In this embodiment, the voltage transformation unit is a dual-output transformer, the second voltage is 90V, and the third voltage is 280V, that is, the first voltage is greater than the second voltage and less than the third voltage.
The switching unit comprises a first contactor KM1, a second contactor KM2, a third contactor KM3 and a switching control circuit, wherein coils of the contactors are arranged on the switching control circuit, so that normally open contacts of the first contactor KM1, the second contactor KM2 and the third contactor KM3 can be selectively closed or opened under the condition that a current loop of the switching control circuit is conducted.
The power supply output end is respectively connected with the first output end, the second output end and the power supply input end through normally open contacts of the first contactor KM1, the second contactor KM2 and the third contactor KM3, so that switching control of output voltage is realized.
Regarding the switching control circuit, in order to realize that the normally open contacts of the first contactor KM1, the second contactor KM2 and the third contactor KM3 are not closed at the same time, the power supply safety is ensured, and the load is prevented from being damaged in the working process. In this embodiment, the switching control circuit includes a time relay, a first intermediate relay KA1, a second intermediate relay KA2, a third intermediate relay KA3, a fourth intermediate relay KA4, and a fifth intermediate relay KA 5. The coils of the first contactor KM1, the second contactor KM2 and the third contactor KM3 are connected with the power supply input end through normally open contacts of the first intermediate relay KA1, the second intermediate relay KA2 and the third intermediate relay KA3 respectively.
In a specific circuit structure, the time relay is provided with a first time sequence switch AL1 and a second time sequence switch AL2 which are switched to be closed according to a preset time sequence, and a coil of the time relay is connected with the power supply input end. In this embodiment, the time relay is integrated in an intelligent instrument controller, and the model of the intelligent instrument controller is AI-716P.
The coil of the first intermediate relay KA1, the normally closed contact of the second intermediate relay KA2 and the normally closed contact of the third intermediate relay KA3 are connected in series and then connected with the coil of the fourth intermediate relay KA4 in parallel to form a first branch circuit.
And a coil of the second intermediate relay KA2, a normally closed contact of the first intermediate relay KA1 and a normally closed contact of the third intermediate relay KA3 are connected in series and then are connected with a coil of the fifth intermediate relay KA5 in parallel to form a second branch.
The coil of the third intermediate relay KA3, the normally closed contact of the first intermediate relay KA1, the normally closed contact of the second intermediate relay KA2, the normally closed contact of the fourth intermediate relay KA4 and the normally closed contact of the fifth intermediate relay KA5 are connected in series to form a third branch.
The first timing switch AL1 and the second timing switch AL2 are connected in series with the first branch and the second branch, respectively, and are connected to the power supply input terminal, and the third branch is also connected to the power supply input terminal.
Therefore, the utility model discloses its theory of operation of power supply switching circuit is as follows:
after the load is connected to the power supply output end, the voltage at two ends of the load is controlled by the output voltage of the power supply switching circuit. Because the coil of the time relay is connected to the power supply input end, the time relay switches and closes the first timing switch AL1 and the second timing switch AL2 according to the preset timing after being electrified.
When the first timing switch AL1 is closed, the coils of the first intermediate relay KA1 and the fourth intermediate relay KA4 are energized, the normally open contact of the first intermediate relay KA1 is closed, the coil of the first contactor KM1 is energized, the normally open contact is closed, and the output end outputs 90V to supply power to the load. Simultaneously, first intermediate relay KA1 and fourth intermediate relay KA 4's normally closed contact disconnection, make second intermediate relay KA2 and third intermediate relay KA 3's coil can not the circular telegram, first intermediate relay KA1 has been prevented, second intermediate relay KA2 and third intermediate relay KA 3's normally open contact is closed simultaneously, first contactor KM1 like this, second contactor KM2, third contactor KM 3's coil can not be circular telegram simultaneously, its normally open contact just can not be closed simultaneously yet, power supply safety has been guaranteed.
By the same principle, when the second timing switch AL2 is closed, the coils of the second intermediate relay KA2 and the fifth intermediate relay KA5 are energized, the normally open contact of the second intermediate relay KA2 is closed, the coil of the second contactor KM2 is energized, the normally open contact is closed, and the output end 280V supplies power to the load. Meanwhile, the normally closed contacts of the second intermediate relay KA2 and the fifth intermediate relay KA5 are disconnected, so that the coils of the first intermediate relay KA1 and the third intermediate relay KA3 cannot be electrified, the normally open contacts of the first intermediate relay KA1, the second intermediate relay KA2 and the third intermediate relay KA3 are prevented from being closed at the same time, and power supply safety is guaranteed.
When the first timing switch AL1 and the second timing switch AL2 are both off, the coils of the first intermediate relay KA1, the second intermediate relay KA2, the fourth intermediate relay KA4 and the fifth intermediate relay KA5 are not electrified, so that the normally closed contacts of the third branch are all closed, the coil of the third intermediate relay KA3 is electrified, the normally open contact of the third intermediate relay is closed, and the output end of the output end. Meanwhile, the normally closed contact of the third intermediate relay KA3 is disconnected, so that the coils of the first intermediate relay KA1 and the second intermediate relay KA2 cannot be electrified, the normally open contacts of the first intermediate relay KA1, the second intermediate relay KA2 and the third intermediate relay KA3 are prevented from being closed simultaneously, and the power supply safety is ensured.
The utility model discloses an introduce fourth auxiliary relay KA4 and fifth auxiliary relay KA5 to locate third auxiliary relay KA 3's coil return circuit with its normally closed contact, make the electric interlocking that has realized three routes auxiliary relay under the condition that time relay only has two way outputs, thereby realized the electric interlocking of three routes contactor with lower cost, guaranteed power supply switching circuit's power supply safety, prevent to damage the load in the course of the work.
In addition, in this embodiment, in one working cycle of the time relay, the first timing switch AL1 and the second timing switch AL2 are configured as follows: the sequence of both open, first timing switch AL1 closed, both open, second timing switch AL2 closed, both open cycles. Therefore, the electrical equipment circularly switches according to the sequence of the power supply voltage of 220V-90V-220V-280V-220V and supplies power to the load.
In a preferred embodiment, the power supply switching circuit further includes a first manual switch QS and a second manual switch SB 1.
The power supply input end is connected with the voltage transformation unit, the switching unit and the power supply output end through a first manual switch QS. The switching unit is connected to the supply input via a second manual switch SB 1. The first manual switch QS is a knife switch, and the second manual switch SB1 is a button switch, so as to provide an operation interface for an operator of the electrical equipment and ensure the safety of electricity consumption.
The description of the above specification and examples is intended to illustrate the scope of the invention, but should not be construed as limiting the scope of the invention. Modifications, equivalents and other improvements which may be made to the embodiments of the invention or to some of the technical features thereof by a person of ordinary skill in the art through logical analysis, reasoning or limited experimentation in light of the above teachings of the invention or the above embodiments are intended to be included within the scope of the invention.
Claims (6)
1. A power supply switching circuit is used for providing a variable voltage power supply environment; it is characterized by comprising:
the power supply input end is used for connecting a first voltage;
the input end of the voltage transformation unit is coupled with the power supply input end and outputs a second voltage and a third voltage through the first output end and the second output end of the voltage transformation unit respectively;
the switching unit comprises a first contactor, a second contactor, a third contactor and a switching control circuit; the switching control circuit comprises a time relay, a first intermediate relay, a second intermediate relay, a third intermediate relay, a fourth intermediate relay and a fifth intermediate relay; the time relay is integrated in an intelligent instrument controller, the model of the intelligent instrument controller is AI-716P, and the intelligent instrument controller is provided with a first time sequence switch and a second time sequence switch which are switched on according to a preset time sequence; a coil of the first intermediate relay, a normally closed contact of the second intermediate relay and a normally closed contact of the third intermediate relay are connected in series and then connected in parallel with a coil of the fourth intermediate relay to form a first branch circuit; a coil of the second intermediate relay, a normally closed contact of the first intermediate relay and a normally closed contact of the third intermediate relay are connected in series and then connected in parallel with a coil of the fifth intermediate relay to form a second branch; a coil of the third intermediate relay, the normally closed contact of the first intermediate relay, the normally closed contact of the second intermediate relay, the normally closed contact of the fourth intermediate relay and the normally closed contact of the fifth intermediate relay are connected in series to form a third branch; the first time sequence switch and the second time sequence switch are respectively connected with the first branch circuit and the second branch circuit in series and are connected with the power supply input end, and the third branch circuit is also connected with the power supply input end; the coils of the first contactor, the second contactor and the third contactor are respectively connected with the power supply input end through the normally open contacts of the first intermediate relay, the second intermediate relay and the third intermediate relay;
and the power supply output end is respectively connected with the first output end, the second output end and the power supply input end through the normally open contacts of the first contactor, the second contactor and the third contactor.
2. A power supply switching circuit as claimed in claim 1, wherein: the first voltage is greater than the second voltage and less than the third voltage.
3. A power supply switching circuit as claimed in claim 1, wherein: and the coil of the time relay is connected with the power supply input end.
4. A power supply switching circuit as claimed in claim 1, wherein: the voltage transformation unit is a double-output transformer.
5. A power supply switching circuit as claimed in claim 1, wherein: the power supply input end is connected with the voltage transformation unit, the switching unit and the power supply output end through the first manual switch.
6. A power supply switching circuit as claimed in claim 1, wherein: the switching unit is connected with the power supply input end through a second manual switch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020760197.XU CN212343328U (en) | 2020-05-09 | 2020-05-09 | Power supply switching circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020760197.XU CN212343328U (en) | 2020-05-09 | 2020-05-09 | Power supply switching circuit |
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| CN212343328U true CN212343328U (en) | 2021-01-12 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113153558A (en) * | 2021-04-08 | 2021-07-23 | 徐州徐工环境技术有限公司 | Chassis engine rotating speed control device and control method |
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2020
- 2020-05-09 CN CN202020760197.XU patent/CN212343328U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113153558A (en) * | 2021-04-08 | 2021-07-23 | 徐州徐工环境技术有限公司 | Chassis engine rotating speed control device and control method |
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