CN218335417U

CN218335417U - Double-voltage automatic switching circuit

Info

Publication number: CN218335417U
Application number: CN202222395067.2U
Authority: CN
Inventors: 袁树林
Original assignee: Shenzhen Chaojie Industrial Co ltd
Current assignee: Shenzhen Chaojie Industrial Co ltd
Priority date: 2022-09-08
Filing date: 2022-09-08
Publication date: 2023-01-17
Anticipated expiration: 2032-09-08

Abstract

The utility model relates to a dual voltage automatic switch-over circuit, including AC input end, resistance-capacitance step-down circuit unit, bridge rectifier circuit unit, relay, the AC output end, the coil of AC input end, bridge rectifier circuit unit, relay connects gradually, and AC input end AC2 is connected with the public end of relay, and the AC output end includes low pressure AC output end, high pressure AC output end. The utility model discloses a resistance-capacitance voltage reduction circuit unit carries out the step-down current-limiting to the commercial power of input, and only when the voltage of the alternating current of alternating current input end input was high-voltage alternating current, the relay just can work, makes the power automatic switch-over between different voltages through the relay, can make alternating current input end automatic switch-over and low pressure exchange output, high pressure exchange output between be connected, the components and parts that use are few, simple circuit, safe and reliable.

Description

Double-voltage automatic switching circuit

Technical Field

The utility model relates to a detect and control circuit, especially a dual voltage automatic switch-over circuit.

Background

At present, voltages used in different regions in the world are different, mainly 110V and 220V, most products cannot be switched between 110V and 220V, and due to the fact that the difference between the two voltages is large, when international products are designed, a dial switch is adopted by a plurality of manufacturers to manually switch input voltages, but if an operator operates the international products wrongly in actual operation, an electronic circuit is damaged, certain economic loss is caused, and inconvenience is brought to the manufacturers and users.

To solve the existing problems, some double-voltage automatic switching control circuits appear on the market, but the double-voltage automatic switching control circuits use voltage detection units such as a single chip microcomputer and a PLC chip to detect voltage, then the switching of relays is controlled according to different voltages to realize automatic voltage switching control, the used voltage detection units also need burning programs, and the like, and the double-voltage automatic switching control circuits are complex and high in production cost.

SUMMERY OF THE UTILITY MODEL

To present not enough, the utility model provides a two voltage automatic switch-over circuits.

The utility model provides a technical scheme that its technical problem adopted is: the utility model provides a dual voltage automatic switch-over circuit, includes alternating current input end, resistance-capacitance step-down circuit unit, bridge rectifier circuit unit, relay, the output that exchanges, the coil of alternating current input end, bridge rectifier circuit unit, relay connects gradually, alternating current input end includes alternating current input end AC1, alternating current input end AC2, resistance-capacitance step-down circuit unit establish ties at alternating current input end AC1 behind the parallelly connected electric capacity of discharge resistance, alternating current input end AC2 is connected with the public end of relay, alternating current output end includes low pressure alternating current output, high pressure alternating current output, be connected with low pressure alternating current output between the normally closed contact of relay and the alternating current input end AC1, be connected with high pressure alternating current output between the normally open contact of relay and the alternating current input end AC 1.

Preferably, the bridge rectifier circuit unit is a bridge rectifier circuit unit composed of four diodes.

Preferably, a filter capacitor is connected in parallel to a coil of the relay.

Preferably, an adjustable resistor is connected in series between the bridge rectifier circuit unit and the coil of the relay.

Preferably, a safety circuit unit is arranged between the alternating current input end and the resistance-capacitance voltage reduction circuit.

Preferably, the fuse circuit unit is a fuse or a varistor.

The beneficial effects of the utility model reside in that: the utility model reduces the voltage and limits the current of the input commercial power through the resistance-capacitance voltage reduction circuit unit, when the alternating current input by the alternating current input end is the low-voltage alternating current in the double voltages, the relay keeps being connected with the original contact; when the alternating current input by the alternating current input end is the high-voltage alternating current in the double-voltage, the current and the voltage at the two ends of the coil of the relay are the rated working current and the rated working voltage of the relay, and the relay switches the contacts connected to realize the automatic voltage switching control. The relay can be directly controlled to work without voltage detection units such as a single chip microcomputer and a PLC chip for detecting voltage, a program is not required to be burnt, the number of used components is small, and the production cost is low.

Drawings

Fig. 1 is a schematic diagram of a circuit connection structure according to an embodiment of the present invention;

part names and serial numbers in the figure: 1-alternating current input end 11-alternating current input end AC 1-alternating current input end AC 2-resistance-capacitance voltage reduction circuit unit 21-discharge resistor 22-capacitor 3-bridge rectifier circuit unit 4-relay 41-coil 42 of relay-common end 43 of relay-normally closed contact 44 of relay-normally open contact 5 of relay-alternating current output end 51-low voltage alternating current output end 52-high voltage alternating current output end 6-filter capacitor 7-adjustable resistor 8-safety circuit unit.

Detailed Description

To more clearly illustrate the objects, technical solutions and advantages of the embodiments of the present invention, the present invention will be further described in conjunction with the accompanying drawings and embodiments, which are described in a clear and complete manner. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the protection scope of the present invention. Furthermore, directional terms mentioned in the present disclosure, such as "upper", "lower", "front", "rear", "left", "right", "inner", "outer", etc., refer only to the direction of the attached drawings, and the directional terms used are for better, clearer illustration and understanding of the present invention, rather than indicating or implying the orientation the present invention must have, and therefore should not be construed as limiting the present invention.

The embodiment of the utility model is shown in fig. 1, a dual-voltage automatic switching circuit, including AC input end 1, resistance-capacitance step-down circuit unit 2, bridge rectifier circuit unit 3, relay 4, AC output end 5, AC input end 1, bridge rectifier circuit unit 3, relay 4's coil connects gradually, AC input end 1 includes AC input end 1AC1, AC input end 1AC2, resistance-capacitance step-down circuit unit 2 establishes ties at AC input end 1AC1 for behind the parallelly connected electric capacity 22 of discharge resistance 21, AC input end 1AC2 is connected with relay 4's common port, AC output end 5 includes low pressure AC output 51, high pressure AC output 52, be connected with low pressure AC output 51 between relay 4's normally closed contact and the AC input end 1AC1, be connected with high pressure AC output 52 between relay 4's normally open contact and the AC input end 1AC 2.

The working principle of the resistance-capacitance voltage reduction is that the maximum working current is limited by using the capacitance generated by the capacitor 22 under a certain alternating current signal frequency, and meanwhile, a resistive element is connected in series with the capacitor 22, so that the voltage obtained at two ends of the resistive element and the power consumption generated by the resistive element completely depend on the characteristics of the resistive element. The capacitor 22 is used for reducing voltage, in fact, current is limited by using capacitive reactance, the capacitor 22 can play a role in limiting current and dynamically distributing voltage between the capacitor 22 and a load (a rectifier bridge and a circuit behind the rectifier bridge), and the resistance-capacitance voltage reducing circuit unit 2 is commonly used in an LED driving power supply.

In summary, when ac is input into the ac input terminal 1, after the ac with different voltages passes through the rc step-down circuit units 2 with the same specification, the output ac currents are different. The direct current power supply can be output after the voltage reduction and current limitation of the resistance-capacitance voltage reduction circuit unit 2 and the rectification of the bridge rectifier circuit unit 3. The relay 4 has working voltage and current, when the output direct current electric energy after the alternating current input end 1 inputs the alternating current meets the working voltage and current of the relay 4, the relay 4 is attracted, otherwise the relay 4 is not attracted.

In this embodiment, the dual voltage input by the ac input terminal 1 includes two types, i.e., a high-voltage ac and a low-voltage ac, and the capacitor 22 selects a corresponding and appropriate specification, so that when the voltage of the ac input by the ac input terminal 1 is the high-voltage ac, the current and the voltage at the two ends of the relay 4 are the rated working current and the voltage of the relay 4, and the relay 4 can work only when the voltage of the ac input by the ac input terminal 1 is the high-voltage ac.

In this embodiment, the ac power input from the ac input terminal 1 is 110V ac and 220V ac with the same frequency, the capacitor 22 is a 105J/400V BBS capacitor 22, and the relay 4 is a 12VDC relay 4. When the alternating current input by the alternating current input end 1 is 110V alternating current, the relay 4 is not attracted, the common end of the relay 4 is kept connected with the normally closed end, and the alternating current input end 1 is communicated with the low-voltage alternating current output end 51; when the alternating current input by the alternating current input end 1 is 220V alternating current, the relay 4 is closed, the common end of the relay 4 is connected with the normally open end, and at the moment, the alternating current input end 1 is communicated with the high-voltage alternating current output end 52, so that the output circuit can be automatically switched according to different input voltages.

In this embodiment, after the operation is finished, the discharging resistor 21 can discharge the capacitor 22, thereby preventing the user from getting an electric shock and increasing the safety.

In the actual operation process, the alternating current input end 1AC1 and the alternating current input end 1AC2 are correspondingly connected with a zero line and a live line of alternating current, the alternating current firstly carries out voltage reduction and current limitation through the resistance-capacitance voltage reduction circuit unit 2, and then the alternating current is converted into direct current through the bridge rectifier circuit unit 3 to be output. After the alternating current with different voltages passes through the resistance-capacitance voltage reduction circuit units 2 with the same specification, the current of the output alternating current is different. When the voltage of the alternating current input by the alternating current input end 1 is high-voltage alternating current, the relay 4 works, namely, the alternating current input end 1 is communicated with the high-voltage alternating current output end 52, otherwise, the alternating current input end 1 is communicated with the low-voltage alternating current output end 51, and an output circuit can be automatically switched according to different input voltages.

In a further improvement, as shown in fig. 1, the bridge rectifier circuit unit 3 is a bridge rectifier circuit unit 3 composed of four diodes, which is low in cost and meets the use requirement.

In a further improvement, as shown in fig. 1, a filter capacitor 622 is connected in parallel to the coil of the relay 4, and the filter capacitor 622 can filter an ac component of the current output by the bridge rectifier circuit unit 3, so that the output dc is smoother.

In a further improvement, as shown in fig. 1, an adjustable resistor 7 is connected in series between the bridge rectifier circuit unit 3 and the coil of the relay 4, so that the current and voltage at both ends of the relay 4 can be adjusted more accurately, that is, when the voltage of the ac input at the ac input terminal 1 is high-voltage ac, the current and voltage at both ends of the relay 4 are the rated operating current and voltage of the relay 4.

In a further improvement, as shown in fig. 1, a safety circuit unit 8 is arranged between the ac input terminal 1 and the rc step-down circuit to prevent a user from accessing an ac power with an excessively high voltage, so as to prevent the circuit from being damaged.

In a further improvement, as shown in fig. 1, the safety circuit unit 8 is a fuse or a voltage dependent resistor, and the components are easily available and effective.

It will be understood that modifications and variations can be made by persons skilled in the art in light of the above teachings and all such modifications and variations are considered to be within the scope of the invention as defined by the following claims.

Claims

1. A kind of dual voltage automatic switching circuit, characterized by that: including alternating current input end, resistance-capacitance voltage reduction circuit unit, bridge rectifier circuit unit, relay, alternating current output end, the coil of alternating current input end, bridge rectifier circuit unit, relay connects gradually, alternating current input end includes alternating current input end AC1, alternating current input end AC2, resistance-capacitance voltage reduction circuit unit establishes ties at alternating current input end AC1 after for the parallelly connected electric capacity of discharge resistance, alternating current input end AC2 is connected with the public end of relay, alternating current output end includes low pressure alternating current output end, high pressure alternating current output end, be connected with the low pressure output that exchanges between the normally closed contact of relay and the alternating current input end AC1, be connected with the high pressure output that exchanges between the normally closed contact of relay and the alternating current input end AC 1.

2. The dual-voltage automatic switching circuit of claim 1, wherein the bridge rectifier circuit unit is a bridge rectifier circuit unit consisting of four diodes.

3. The automatic dual-voltage switching circuit of claim 1, wherein a filter capacitor is connected in parallel to the coil of the relay.

4. The dual-voltage automatic switching circuit of claim 1, wherein an adjustable resistor is connected in series between the bridge rectifier circuit unit and the coil of the relay.

5. The dual-voltage automatic switching circuit of claim 1, wherein a fuse circuit unit is disposed between the AC input terminal and the RC step-down circuit.

6. The dual-voltage automatic switching circuit of claim 5, wherein the fuse circuit unit is a fuse or a varistor.