CN215419719U - Automatic switching device for alternating current and direct current power supplies of vehicle-mounted equipment - Google Patents
Automatic switching device for alternating current and direct current power supplies of vehicle-mounted equipment Download PDFInfo
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- CN215419719U CN215419719U CN202121447281.7U CN202121447281U CN215419719U CN 215419719 U CN215419719 U CN 215419719U CN 202121447281 U CN202121447281 U CN 202121447281U CN 215419719 U CN215419719 U CN 215419719U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
- Y04S20/20—End-user application control systems
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Abstract
The utility model relates to an automatic switching device of an alternating current and direct current power supply of vehicle-mounted equipment, which comprises an alternating current switch power supply, an electric load, a direct current standby power supply and an alternating current relay, wherein the alternating current switch power supply is connected with the alternating current relay; the alternating current relay is provided with two contacts which are in a single-pole double-throw mode, and comprises two relay coil ends and three leading-out ends; the three leading-out ends are a central contact end, a normally closed contact end and a normally open contact end; the coil end of the relay is connected with the alternating current input end of the alternating current switching power supply in parallel; the positive electrode of the electric load is connected with the central contact end of the relay; the direct-current output positive electrode of the alternating-current switch power supply is connected with the normally open contact end of the relay; the positive electrode of the direct-current standby power supply is connected with the normally closed contact end of the relay; the negative electrode of the output end of the alternating current switch power supply, the negative electrode of the direct current standby power supply and the negative electrode of the electric load are connected in parallel. The utility model adopts an alternating current relay to directly switch the power supply without a control circuit or voltage loss, and the two power supplies are completely isolated and do not interfere with each other.
Description
Technical Field
The utility model belongs to the technical field of power supply switching, and particularly relates to an automatic switching device for an alternating current power supply and a direct current power supply of vehicle-mounted equipment.
Background
The general vehicle-mounted equipment has the requirements of power supply of an alternating current 220V power supply and a direct current 12V power supply, the direct current power supply is used as a standby power supply, an automatic switching device is needed, the alternating current 220V power supply can be automatically switched to the direct current power supply for power supply when the alternating current 220V power supply is cut off, and the alternating current power supply needs to be switched to the alternating current power supply when the alternating current 220V power supply recovers to supply power.
There are various technical solutions for the switch, such as an electronic switch, a diode isolating switch, etc.
The first two schemes belong to electronic switching, the first scheme needs a control circuit to judge whether an alternating current power supply is electrified, the second scheme does not need to judge but is influenced by the voltage drop of a diode tube, the output voltage is reduced along with the output current, the output direct current voltage of an alternating current power supply end is higher than the direct current voltage of a direct current bottle end, and otherwise, uncertainty exists in which power supply is carried out.
The electronic switching scheme needs an independent control circuit and has the defects of high cost and complex structure; the diode isolating switch can cause the problem of voltage reduction, and the two paths of isolation are not enough, so that power can be supplied at the same time, and the electric quantity storage of the storage battery is reduced.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide an automatic switching device of an alternating current and direct current power supply of vehicle-mounted equipment, which adopts a relay as a switch, can completely isolate two paths of power supply circuits, does not need debugging, is a hard switching mode similar to a toggle switch, and is convenient and reliable.
The utility model provides an automatic switching device of an alternating current and direct current power supply of vehicle-mounted equipment, which comprises an alternating current switch power supply, an electric load, a direct current standby power supply and an alternating current relay, wherein the alternating current switch power supply is connected with the alternating current relay;
the alternating current relay is provided with two contacts which are in a single-pole double-throw mode, and comprises two relay coil ends and three leading-out ends; the three leading-out ends are a central contact end, a normally closed contact end and a normally open contact end;
the coil end of the relay is connected with the alternating current input end of the alternating current switching power supply in parallel; the positive electrode of the electric load is connected with the central contact end of the relay; the direct-current output positive electrode of the alternating-current switching power supply is connected with the normally open contact end of the relay; the positive electrode of the direct-current standby power supply is connected with the normally closed contact end of the relay; and the negative electrode of the output end of the alternating current switching power supply, the negative electrode of the direct current standby power supply and the negative electrode of the electric load are connected in parallel.
Further, the direct current standby power supply is a 12V direct current storage battery.
Compared with the prior art, the utility model has the beneficial effects that:
the power supply can be directly switched by adopting the alternating current relay without a control circuit or voltage loss, two power supplies are completely isolated and do not interfere with each other, the problem of automatic switching of alternating current and direct current power supplies of the vehicle-mounted equipment is solved in a low-cost and high-reliability mode, and the function of taking the direct current power supply as a backup is realized.
Drawings
Fig. 1 is a schematic structural diagram of an automatic switching device for an ac/dc power supply of a vehicle-mounted device according to the present invention.
Detailed Description
The present invention is described in detail with reference to the embodiments shown in the drawings, but it should be understood that these embodiments are not intended to limit the present invention, and those skilled in the art should understand that functional, methodological, or structural equivalents or substitutions made by these embodiments are within the scope of the present invention.
Referring to fig. 1, the scheme can realize the functions of alternating current power supply and backup of the vehicle-mounted equipment by using the direct current storage battery, and adopts the following technical scheme:
for describing the scheme, the circuit in the vehicle-mounted equipment is divided into three major parts, namely an alternating current switching power supply 1, an electric load 2 and a direct current standby power supply 3.
The scheme adds a 220V alternating current relay 4 with two contacts, and the contacts are in a single-pole double-throw mode. The ac relay 4 has three leading-out terminals, i.e., a center contact, a normally closed contact terminal, and a normally open contact terminal, in addition to two coil terminals.
The coil end of the relay is connected with the alternating current input end of the switch power supply 1 in parallel and is connected to an alternating current 220V power supply.
The positive pole of the electric load 2 is connected to the central contact of the relay, the direct current output positive pole of the switch power supply 1 is connected to the normally open contact of the relay, and the positive pole of the direct current standby power supply 3 is connected to the normally closed contact of the relay.
The negative electrode of the output end of the switching power supply 1, the negative electrode of the direct current standby power supply 3 and the negative electrode of the electric load 2 are connected in parallel.
The working process is as follows:
when the alternating current 220V supplies power, the coil of the alternating current relay is attracted by the normally open contact through the current, the normally closed contact is disconnected, the switching power supply 1 works to output the direct current, the direct current is connected to the center of the contact through the normally open contact of the relay and reaches the positive electrode of the electric load 2, and the alternating current power supply is completed.
When the alternating current 220V is cut off, no current passes through the coil of the alternating current relay, the normally open contact is disconnected, the normally closed contact is closed, the positive pole of the direct current standby power supply 3 (a 12V direct current storage battery can be adopted) is connected to the center of the contact through the normally closed contact of the relay, and reaches the positive pole of the electric load 2 to finish the direct current power supply.
The automatic switching device utilizes the electromagnetic force generated by the 220V alternating current relay coil to attract or release the metal plate of the contact thereof, achieves the effect of automatic switching, simplifies the control circuit, has the advantages of simplicity, reliability, maintenance-free property, low cost and the like, and is suitable for automatic switching of two paths of power supplies. Meanwhile, when the contact is attracted with the metal plate, the resistance is extremely small, the problem of voltage reduction does not exist when a large current passes through the contact, the heating is low, namely, a power supply and a load are connected together by a lead, no additional device is provided, and the contact is suitable for various circuit loads.
It will be evident to those skilled in the art that the utility model is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the utility model being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Claims (2)
1. An automatic switching device of an alternating current power supply and a direct current power supply of vehicle-mounted equipment is characterized by comprising an alternating current switch power supply, an electric load, a direct current standby power supply and an alternating current relay;
the alternating current relay is provided with two contacts which are in a single-pole double-throw mode, and comprises two relay coil ends and three leading-out ends; the three leading-out ends are a central contact end, a normally closed contact end and a normally open contact end;
the coil end of the relay is connected with the alternating current input end of the alternating current switching power supply in parallel; the positive electrode of the electric load is connected with the central contact end of the relay; the direct-current output positive electrode of the alternating-current switching power supply is connected with the normally open contact end of the relay; the positive electrode of the direct-current standby power supply is connected with the normally closed contact end of the relay; and the negative electrode of the output end of the alternating current switching power supply, the negative electrode of the direct current standby power supply and the negative electrode of the electric load are connected in parallel.
2. The automatic switching device of the alternating current power supply and the direct current power supply of the vehicle-mounted equipment according to claim 1, wherein the direct current standby power supply is a 12V direct current battery.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121447281.7U CN215419719U (en) | 2021-06-28 | 2021-06-28 | Automatic switching device for alternating current and direct current power supplies of vehicle-mounted equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121447281.7U CN215419719U (en) | 2021-06-28 | 2021-06-28 | Automatic switching device for alternating current and direct current power supplies of vehicle-mounted equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215419719U true CN215419719U (en) | 2022-01-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121447281.7U Active CN215419719U (en) | 2021-06-28 | 2021-06-28 | Automatic switching device for alternating current and direct current power supplies of vehicle-mounted equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215419719U (en) |
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2021
- 2021-06-28 CN CN202121447281.7U patent/CN215419719U/en active Active
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