TWM566627U - Controllable charging and discharging circuit of welding machine - Google Patents

Abstract

A controllable charging and discharging circuit for a welding machine, which can include a power supply unit, a rectifying unit, a power supply unit, a charging unit, a discharging unit and a working unit. The power supply unit can adjust the input voltage according to different workpieces, and after rectifying by the rectifying unit, to the charging unit Charging is performed. When the charging unit reaches the required electric energy, the electric energy is input into the working unit by the discharge unit, and the workpiece to be welded is welded. If the working voltage of the workpiece to be welded is smaller when the workpiece is replaced, a power-discharging unit is provided, and the power-discharging unit can discharge the higher electric energy during the original charging to avoid excessive electric energy entering the working unit, causing damage to the workpiece or Bad solder joints.

Description

Welding machine controllable charge and discharge circuit

The present invention relates to a charging and discharging circuit, and particularly relates to a charging and discharging circuit controllable by a welding machine.

Resistance welding is to heat the workpiece to be welded between the two electrodes, and use the electric resistance heat generated by the current flowing through the contact surface of the workpiece and the electrode and the adjacent region to heat the workpiece to a molten state or a plastic state. To be joined, in order to avoid arcing of the contact surface and to control the metal joint condition, the welding process continues to apply pressure.

Check, the conventional resistance welding control circuit uses AC power as a common means to control the current by the rectifier, and to output continuous current for welding for a long time. The welding time is longer, the power efficiency and efficiency are lower, so it is more power-consuming. However, the AC welding machine has a long electrification time, but it is easy to cause the welding point to be too large. Therefore, for a specific material, the resistance welding machine has another type: a capacitor energy storage type. The power factor of the capacitor energy storage type is higher than that of the AC type, so it is more energy-saving. However, due to the energy storage of the capacitor, when the different workpieces are changed, the initial welding current is large, and the discharge time is extremely short, and the welding result is difficult to control. It is used for welding non-ferrous metal workpieces with slow heat dissipation.

Although the capacitor energy storage welding machine has its advantages, there are still disadvantages, that is, the amount of current flowing is extremely large, and the energization time is extremely short. In addition to the shape of the workpiece welding, such current characteristics are also likely to cause electrode head wear. The resistance welding machine is widely used in the metal processing industry. The improvement direction is mainly to accurately measure the welding current and precisely control the welding current. The improvement of the resistance welding machine is an important industrial issue.

In view of the above prior art problems, it is an object of the present invention to provide a controllable stable charge and discharge circuit to solve the problems of the prior art capacitive energy storage type resistance welding machine.

According to one of the purposes of the present invention, a controllable charge and discharge circuit for a welding machine is proposed, which can include a power supply unit, a rectifying unit, a power supply unit, a charging unit, a discharge unit and a working unit. The power supply unit can adjust the input voltage according to different workpieces. After being rectified by the rectifying unit, the charging unit is charged. When the charging unit is charged, the discharging unit is disconnected on the circuit. When the charging unit reaches the required electric energy, the discharging unit is in the circuit, and the charging unit is open on the circuit. The electric energy is input into the working unit by the discharge unit, and the workpiece to be welded is welded. If the working voltage is lower when the workpiece is replaced after the workpiece is replaced, a power-discharging unit is provided, which can discharge the higher electric energy during the original charging to avoid excessive electric energy entering the working unit, resulting in damage to the workpiece or poor solder joint. The problem.

In the following, reference will be made to the relevant drawings to explain how to implement the controllable charge and discharge circuit of the welding machine of the present invention. In order to clearly illustrate the schematic description, the dimensions and proportions of the components in the drawings may be exaggerated or reduced, in the following description. In the context of a patent or a patent application, when the element is "connected" to another element, it can be directly connected to the other element or the intervening element can be present, and when the element is referred to as "directly connected" to another element, There are no intervening elements.

In the following, according to the adjustment of the target charging voltage, the charging is performed after the charging is performed. Referring to FIG. 1 and FIG. 2, after confirming the required electric energy of the workpiece to be welded, the charging voltage input to the rectifying unit 2 by the charging transformer 11 of the power supply unit 1 is adjusted. A current limiting resistor 7 is disposed between the charging transformer 11 and the rectifying unit 2 to prevent unstable current or surge in the power grid from entering the rectifying unit 2, causing circuit damage. When the alternating current positive phase sequence flows in, the current flows through the step-controlled rectifier 21, The charging capacitor 41 in the charging unit 4 is charged. When the negative phase sequence of the AC circuit flows in, the current flows through the step-controlled rectifier 23 to charge the charging capacitor 41 in the charging unit 4, and the rectifier rectifier 21 and the controlled rectifier are controlled. The anti-reverse diode 22 and the anti-reverse diode 24 are respectively connected at one end of 23 to avoid circuit damage. When the welding machine controls the charge and discharge circuit to perform charging, the controller 8 sets the discharge unit 5 and the discharge unit 3 to be open.

When the charging capacitor 41 is charged to the required power, the controller 8 opens the rectifying unit 2, at which time the discharge unit 5 and the bleeder unit 3 are set as paths. During the discharge, the voltage controlled rectifier 51 enters an on state, and the electric energy contained in the charging capacitor 41 is placed in the working unit 6 for performing the welding work. If there is a different workpiece, the working voltage needs to be lowered, and the leakage unit 31 is provided with a leakage capacitor 31 and a bleeder resistor 32 for protecting the workpiece. For example, the working voltage required for the workpiece to be welded is less than that of the previously welded workpiece. Then, the bleeder unit 3 is originally stored in the charging capacitor 41, and the electrical energy required for the workpiece to be soldered is discharged, and the correct working power is put into the working unit 6 for soldering work.

In summary, this creation has a groundbreaking structure, and has improved design and creation content, while at the same time achieving industrial use and progress, and this creation has not been seen in any information that can be known to the public. It is novel, when it meets the requirements of the Patent Law and Regulations, it proposes a new type of patent application according to law, and asks the board of directors to grant legal patent rights to the princess.

Only the above-mentioned ones are only one of the preferred embodiments of the present invention, and the scope of implementation of the present invention cannot be limited accordingly; that is, the equal changes and modifications created by the patent application scope of this creation should still be covered by this creation patent. range.

1‧‧‧Power supply unit
2‧‧‧Rectifier unit
3‧‧‧Discharge unit
4‧‧‧Charging unit
5‧‧‧Discharge unit
6‧‧‧Working unit
7‧‧‧ Current limiting resistor
8‧‧‧ Controller
11‧‧‧Charging transformer
21‧‧‧Controlled rectifier
22‧‧‧Anti-reverse diode
23‧‧‧Controlled rectifier
24‧‧‧Anti-reverse diode
31‧‧‧Break capacitance
32‧‧‧Discharge resistor
41‧‧‧Charging capacitor
42‧‧‧Anti-reverse diode
51‧‧‧Controlled rectifier

The first picture is a schematic diagram of the creation of the second picture

Claims (7)

A controllable charge and discharge circuit for a welding machine, comprising: a power supply unit; a rectifying unit, the rectifying unit is connected to the power supply unit; a charging unit, the charging unit is connected to the rectifying unit; and a discharging unit, the discharging unit and the discharging unit The charging unit is connected. When the charging unit performs charging, the discharging unit is an open circuit. When the discharging unit performs discharging, the charging unit is an open circuit; a working unit; the working unit is connected to the discharging unit, and the discharging unit inputs electrical energy. The unit of work. The welding machine controllable charging and discharging circuit of claim 1, further comprising a bleeder unit connected to the discharge unit. The controllable charge and discharge circuit of the welding machine according to claim 2, wherein the power leakage unit is a capacitor, a resistor or a combination of a capacitor and a resistor. The welding machine controllable charging and discharging circuit according to any one of claims 1 to 3, wherein the rectifying unit is a controlled rectifier. The soldering machine controllable charging and discharging circuit according to any one of claims 1 to 3, wherein the charging unit is a capacitor. The controllable charge and discharge circuit of the welding machine according to any one of claims 1 to 3, wherein the discharge unit is a controlled rectifier. The controllable charge and discharge circuit of the welding machine according to any one of claims 1-3, wherein a current limiting resistor is disposed between the power supply unit and the rectifying unit to limit current flow.