CN2881756Y

CN2881756Y - Automatic switching device for double-voltage

Info

Publication number: CN2881756Y
Application number: CN 200520132032
Authority: CN
Inventors: 卢玉清
Original assignee: Individual
Current assignee: Individual
Priority date: 2005-10-28
Filing date: 2005-10-28
Publication date: 2007-03-21
Anticipated expiration: 2015-10-28

Abstract

The utility model relates to a voltage switching device, and particularly relates to an automatic switching device for double-voltage, which is capable of automatically switching the voltage between 220V and 380V A normal voltage signal, detected by a voltage detecting circuit, is sent to a power supply control circuit. The voltage signal of 220V is sent to a voltage doubling rectifying circuit. The doubled voltage is sent to a filter circuit. The filtered AC voltage is finally sent to an inverter. The voltage signal of 380V is directly sent to a filter circuit via a switch circuit and a rectifying circuit. The filtered AC voltage is finally sent to the inverter. An overvoltage voltage signal is sent to an overvoltage protective circuit and the power supply control circuit and then is sent to the switch circuit so as to protect the filter circuit and the inverter from overvoltage damage. The undervoltage voltage is sent to an inverter circuit via an undervoltage protective circuit so as to shutoff the inverter. The utility model thoroughly solves the device damage caused by wrong voltage electrical connection to ensure the working safety of the device.

Description

Two voltage automatic switching devices

Technical field

The utility model is a kind of voltage switching device, particularly a kind of two voltage automatic switching devices that 220V and 380V are automaticallyed switch.

Background technology

In the present electric welding machine industry of China, common welding machine is to connect the effect that different voltages reach switching in the mode that increases transformer tapping by different terminals, happens occasionally with regard to the phenomenon that causes machine to burn because of the wrong terminal like this; And if in inversion welding also the mode with the increase transformer tapping increase input terminal, so not only increase volume, and circuit is more complicated, cost also increases, security performance reduces on the contrary.

Summary of the invention

To be that design is a kind of all can allow machine operate as normal, misconnection voltage also can not cause two voltage automatic switching devices of machine breakdown in difference power supply occasion to the purpose of this utility model.China's power-frequency voltage grade is 220V and 380V, in different places electric pressure difference, have only in some place under a kind of situation of single-phase voltage, use this circuit can realize two voltage automatic switching functions, to reach any equal machine operate as normal that can allow of two kinds of voltages; And when misoperation or error, when just single-phase 220V voltage misconnection being arrived the connection terminal of 220V voltage to the terminals of 380V voltage or with single-phase 380V voltage misconnection, also can automatically switch reaches the position of operate as normal.For this reason, this device has made things convenient for the user to a great extent, has also enlarged usable range, also avoids the machine breakdown that causes because of the misconnection electric pressure simultaneously.

The utility model is realized as follows: the utility model comprises voltage detecting circuit, power control circuit, voltage doubling rectifing circuit, filtering circuit, inverter, rectification circuit, overvoltage crowbar, under-voltage protecting circuit, inverter control circuit, on-off circuit;

The normal pressure signal enters in the power control circuit by voltage detecting circuit, and wherein the voltage signal of 220V enters voltage doubling rectifing circuit, and voltage is increased to and enters filtering circuit after double, and filtering obtains required DC voltage and enters inverter; Wherein the voltage signal of 380V directly enters filtering circuit by on-off circuit, rectification circuit, and filtering obtains required DC voltage and enters inverter;

The overvoltage signal enters overvoltage crowbar, and enters on-off circuit again by power control circuit, thereby protection filtering circuit and inverter avoid its overvoltage to damage;

Under-voltage signal enters inverter control circuit by under-voltage protecting circuit, thereby turn-offs inverter.

Good effect of the present utility model is as follows: the utility model in the scope of voltage ripple of power network ± 10%, and under 220V or 380V voltage, all can operate as normal; Use by regulating the inverter usable range, can also design to satisfy under the bigger situation of input voltage fluctuation variation; No matter be indoor or field work, all can not be subjected to the restriction of input voltage grade, machine is the energy operate as normal all; Easy to operate, thoroughly solved the machine breakdown that wrong voltage causes, guaranteed the safety that machine uses; Manufacturing process is simple, and it is extremely low to improve cost.

Description of drawings

Fig. 1 is the utility model circuit block diagram

Fig. 2 is the utility model circuit theory diagrams

Among the figure: 1 voltage detecting circuit, 2 power control circuits

3 voltage doubling rectifing circuits, 4 filtering circuits

5 inverters, 6 rectification circuits

7 overvoltage crowbars, 8 under-voltage protecting circuits

9 inverter control circuits, 10 on-off circuits

Embodiment

The utility model comprises voltage detecting circuit 1, power control circuit 2, voltage doubling rectifing circuit 3, filtering circuit 4, inverter 5, rectification circuit 6, overvoltage crowbar 7, under-voltage protecting circuit 8, inverter control circuit 9, on-off circuit 10;

When being input as 220V or 380V alternating voltage, at first detected voltage signal is sent in the power control circuit 2 by voltage detecting circuit 1, distinguish 220V or 380V by the recognizer in the power control circuit 2, if the signal that recognizes is 220V, then start voltage doubling rectifing circuit 3 by power control circuit 2, immediately voltage is increased to doublely, obtains required DC voltage to inverter 5 through filtering circuit 4 filtering then; If the signal that recognizes is 380V, then directly obtains required DC voltage and deliver to inverter 5 by on-off circuit 10, rectification circuit 6, filtering circuit 4 without voltage multiplying rectifier;

When input voltage was higher than 220V+10% or 380V+10%, overvoltage crowbar 7 started, and this signal is sent into recognizer in the power control circuit 2, on-off circuit 10 can be cut off, thereby protection filtering circuit 4 and inverter 5 avoided its overvoltage to damage;

When input voltage was lower than 220V-10% or 380V-10%, under-voltage protecting circuit 8 started, and this signal is sent into inverter control circuit 9, thereby turn-offed inverter 5.

The utility model can be used for the inversion direct current manual arc welder, and when input voltage 380V, the direct rectifying and wave-filtering of circuit obtains the 536V DC voltage and sends into inverter; When input voltage was 220V, circuit obtained the 620V DC voltage through voltage multiplying rectifier and sends into inverter.

The utility model also can be used for inversion direct current arc-welding power supply, inversion direct current argon arc welding machine, inversion direct current CO ₂Gas shielded welding machine, inversion direct current air plasma cutter, condenser discharge welder, high-frequency heating power, laser bonding, stud welding machine, Switching Power Supply and other weldering, cut equipment.

Claims

1. two voltage automatic switching device, it is characterized in that: described pair of voltage automatic switching device comprises voltage detecting circuit, power control circuit, voltage doubling rectifing circuit, filtering circuit, inverter, rectification circuit, overvoltage crowbar, under-voltage protecting circuit, inverter control circuit, on-off circuit;