CN202906807U - Dual-voltage automatic changeover switch - Google Patents

Abstract

The utility model provides a dual-voltage automatic changeover switch. The switch includes: a central controller, an input power supply circuit, an input voltage monitoring circuit, a switching circuit, a low voltage output circuit, and a high voltage output circuit; wherein the input power supply circuit is connected with the switching circuit, the switching circuit includes two output terminals respectively connected with the low voltage output circuit and the high voltage output circuit; the switching circuit includes a pick-up type relay switch, so as to conduct the input power supply circuit and the low voltage output circuit or high voltage output circuit; the input voltage monitoring circuit is connected to the input power supply circuit to monitor the input voltage; the central controller is connected to the input voltage monitoring circuit and the switching circuit, so that the switching circuit is controlled and read based on the input voltage signal to conduct the input power supply circuit and the low voltage output circuit or the high voltage output circuit. The automatic control is used, the device is prevented from being burnt by misoperation, and the operation complexity is reduced.

Description

Two voltage automatic transfer switchs

Technical field

The utility model relates to circuit control technology field, relates in particular to a kind of pair of voltage automatic transfer switch.

Background technology

External a lot of country uses the single-phase mains voltage of 110V/220V/60Hz, so just causes using very inconvenient.A lot of equipment are in order to improve availability, mostly by transformer equipment can be worked under two kinds of voltages, or adopt Manual Transfer Switch, or the change motor mode of connection makes the motor normal operation, but these methods all need to adopt manual mode, and it is very inconvenient that the user uses.

Existing diverter switch comprises coiling switching construction and switching over structure.The coiling switching refers to carry out changing-over according to the binding post in the winding diagram; The shortcoming of this structure is cumbersome, and the situation of connection error easily appears in the user, has certain danger.Switching over refers to realize switching by a rearrangeable switch, and the shortcoming of this structure is that the user may bump switch by mistake and makes burn-down of electric motor.

Summary of the invention

For defective and the deficiency of the unreasonable structure of existing pair of voltage apparatus, the purpose of this utility model is to propose more rational pair of voltage automatic transfer switchs of a kind of structure.

In order to achieve the above object, the utility model proposes a kind of pair of voltage automatic transfer switch, comprising: central controller, input power supply circuits, input voltage observation circuit, commutation circuit, low-voltage output circuit, high-voltage output circuit; Described input power supply circuits connect described commutation circuit, and described commutation circuit comprises two outputs, and described two outputs connect respectively described low-voltage output circuit, high-voltage output circuit; Described commutation circuit comprises the suction type relay switch so that described input power supply circuits and described low-voltage output circuit or high-voltage output circuit conducting; Described input voltage observation circuit connects described input power supply circuits with monitoring input voltage; Described central controller connects described input voltage observation circuit and commutation circuit, to control the described commutation circuit that reads with described input power supply circuits and described low-voltage output circuit or high-voltage output circuit conducting according to input voltage signal.

Preferred as technique scheme, the described pair of voltage automatic transfer switch also comprises input power supply circuits relay, and described input power supply circuits relay connects described central controller with according to the instruction conducting of described central controller/described input power supply circuits of disconnection.

Preferred as technique scheme, described central controller comprises:

Reading circuit is used for reading the input voltage value that described input voltage observation circuit is measured;

Decision circuitry connects described reading circuit to judge that whether current input voltage value is greater than predetermined threshold value;

Treatment circuit connects described decision circuitry obtaining judged result, and adjusts described commutation circuit according to judged result.

Preferred as technique scheme, described pair of voltage automatic transfer switch also comprises overload protecting circuit, described overload protecting circuit connects described central controller, so that overcurrent sends overload signal.

Preferred as technique scheme, described central controller also comprises:

The overload treatment circuit connects described overload protecting circuit, adjusts described commutation circuit and disconnect when receiving described overload signal; And described overload treatment circuit also connects described input voltage observation circuit, makes described commutation circuit conducting when receiving after described input voltage disconnection reconnects.

The beneficial effect of the technical scheme that the utility model embodiment provides comprises the following:

1, the utility model adopts the programming Control of central controller, and the existing hand control switch sensitivity of comparing is higher, and can because misoperation causes burning apparatus, not reduce operation complexity.

Description of drawings

Fig. 1 is the modular construction schematic diagram of an embodiment of the utility model;

Fig. 2 is the modular construction schematic diagram of another embodiment of the utility model;

Fig. 3 a and Fig. 3 b are the fundamental diagram of commutation circuit;

Fig. 4 is the schematic diagram of reduction voltage circuit and regulator rectifier circuit;

Fig. 5 is the schematic diagram of input current testing circuit;

Fig. 6 is the schematic diagram of central processing unit, low-voltage output circuit, high-voltage output circuit.

Embodiment

Below in conjunction with accompanying drawing the utility model preferred embodiment one is described further.The utility model will be further described below in conjunction with accompanying drawing and case study on implementation, and certain following embodiment should not be construed as restriction of the present utility model.

The utility model proposes a kind of pair of voltage automatic transfer switch, its principle comprises as shown in Figure 1 and Figure 2: central controller 1, input power supply circuits 2, input voltage observation circuit 3, commutation circuit 4, low-voltage output circuit 5, high-voltage output circuit 6; Described input power supply circuits 2 connect described commutation circuit 3, and described commutation circuit 4 comprises two outputs, and described two outputs connect respectively described low-voltage output circuit 5, high-voltage output circuit 6; Described commutation circuit comprise shown in Fig. 3 a and 3b suction type relay switch JQX so that as described in the input power supply circuits and as described in low-voltage output circuit 5 or high-voltage output circuit 6 conductings.Wherein, described input voltage observation circuit 3 connects described input power supply circuits 2 with monitoring input voltage; Described central controller 1 connects described input voltage observation circuit 3 and commutation circuit 4, to control the described commutation circuit 4 that reads according to input voltage signal with described input power supply circuits 2 and described low-voltage output circuit 5 or high-voltage output circuit 6 conductings.

Shown in Fig. 3 a and 3b, the described pair of voltage automatic transfer switch also comprises input power supply circuits relay NT, and described input power supply circuits relay NT connects described central controller with according to the instruction conducting of described central controller/described input power supply circuits of disconnection.

Concrete, shown in Fig. 3 a and Fig. 3 b, be that this suction type relay switch is that (Fig. 3 is a) and input circuit principle schematic of (Fig. 3 b) when being low pressure for high pressure with input circuit respectively.。

After the equipment energising, central processing unit detects input voltage.If input voltage is not more than 175V, then by attracting electric relay JQX, make the contact be in low-voltage contact position state shown in Fig. 3 b.Then attracting electric relay NT makes of the present utility model pair of voltage automatic transfer switch energising, thereby is the motor power supply.If input voltage is greater than 175V, then attracting electric relay JQX makes the contact be in high voltage contact position shown in Fig. 3 a.Then attracting electric relay NT makes of the present utility model pair of voltage automatic transfer switch energising, thereby is the motor power supply.

As shown in Figure 2, described central controller 1 comprises:

Reading circuit 11 is used for reading the input voltage value that described input voltage observation circuit is measured;

Decision circuitry 12 connects described reading circuit to judge that whether current input voltage value is greater than predetermined threshold value;

Treatment circuit 13 connects described decision circuitry obtaining judged result, and adjusts described commutation circuit according to judged result.

In the prior art, when motor generation overcurrent, overheated etc. overload (for example when motor rotation blockage time, the motor feels hot in the electric current increase), when reaching the break-off signal of overload protective device/electric current, the overload protective device of motor internal can disconnect motor is quit work.And when motor was cooled to the reset temperature of overload protection phase, then the overload protection phase can automatically reset, and motor recovers normal operating conditions.In case be easy to like this cause motor by stall, and do not find the unusual of machine operation in a very long time, the frequent switch of overload protective device meeting finally can cause overload protective device to lose efficacy, burn-down of electric motor.Therefore, as shown in Figure 2, this pair voltage automatic transfer switch also comprises overload protecting circuit 7, and described overload protecting circuit 7 connects described central controller 1, so that send overload signal during overcurrent.Wherein overload protective device belongs to ripe prior art, does not repeat them here.Simultaneously, as shown in Figure 1, also comprise at central controller:

Overload treatment circuit 14 connects described overload protecting circuit 7, adjusts described commutation circuit 4 and disconnect when receiving described overload signal; And described overload treatment circuit 14 also connects described input voltage observation circuit 3, makes described commutation circuit conducting when receiving after described input voltage disconnection reconnects.After the motor normal operation, overload treatment circuit 14 detects and judges current of electric, if electric current is judged to be stall greater than 1.7 times of rated operational currents, disconnect the NT relay with the protection motor 6 seconds behind the stall.

So just the problem of the frequent switch of the sort of overload protective device in the prior art can not occur, only have when user's active deenergization and reclose Shi Caihui to work on.

Shown in Fig. 4-6, be a kind of concrete circuit diagram that the utility model embodiment realizes.Central controller adopts PIC12F675-I/SN.Fig. 4 is the schematic diagram of reduction voltage circuit A and regulator rectifier circuit B; Fig. 5 is the schematic diagram of input current observation circuit; Fig. 6 is the schematic diagram 6 of central processing unit 1, low-voltage output circuit 5, high-voltage output circuit.

Certainly; the utility model also can have other embodiment; in the situation that do not deviate from the utility model spirit and essence thereof; the person of ordinary skill in the field works as can make various corresponding changes and distortion according to the utility model, but these corresponding changes and distortion all should belong to the protection range of claim of the present utility model.

Claims (5)

1. a two voltage automatic transfer switch is characterized in that, comprising: central controller, input power supply circuits, input voltage observation circuit, commutation circuit, low-voltage output circuit, high-voltage output circuit; Described input power supply circuits connect described commutation circuit, and described commutation circuit comprises two outputs, and described two outputs connect respectively described low-voltage output circuit, high-voltage output circuit; Described commutation circuit comprises the suction type relay switch so that described input power supply circuits and described low-voltage output circuit or high-voltage output circuit conducting; Described input voltage observation circuit connects described input power supply circuits with monitoring input voltage; Described central controller connects described input voltage observation circuit and commutation circuit, to control the described commutation circuit that reads with described input power supply circuits and described low-voltage output circuit or high-voltage output circuit conducting according to input voltage signal.

2. according to claim 1 pair of voltage automatic transfer switch, it is characterized in that, the described pair of voltage automatic transfer switch also comprises input power supply circuits relay, and described input power supply circuits relay connects described central controller with according to the instruction conducting of described central controller/described input power supply circuits of disconnection.

3. according to claim 1 pair of voltage automatic transfer switch is characterized in that, described central controller comprises:

Reading circuit is used for reading the input voltage value that described input voltage observation circuit is measured;

Decision circuitry connects described reading circuit to judge that whether current input voltage value is greater than predetermined threshold value;

Treatment circuit connects described decision circuitry obtaining judged result, and adjusts described commutation circuit according to judged result.

4. according to claim 1 pair of voltage automatic transfer switch is characterized in that, described pair of voltage automatic transfer switch also comprises overload protecting circuit, and described overload protecting circuit connects described central controller, so that send overload signal during overcurrent.

5. according to claim 4 pair of voltage automatic transfer switch is characterized in that, described central controller also comprises:

The overload treatment circuit connects described overload protecting circuit, adjusts described commutation circuit and disconnect when receiving described overload signal; And described overload treatment circuit also connects described input voltage observation circuit, makes described commutation circuit conducting when receiving after described input voltage disconnection reconnects.

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