The precision and efficiency of the control system of precision spot welding machine are derived from a series of complex and sophisticated circuit designs. The system includes multiple key parts such as EMI filter circuit, transformer rectifier filter voltage regulator circuit, synchronization circuit, CPU program control circuit, startup circuit, drive circuit, externally excited switching power supply circuit, and pulse generation and output circuit.
As the "gateway" of the system, the EMI filter circuit is connected to the AC380V voltage through IN1 and IN2, and is output to the control transformer through OUT1 and OUT2 through the carefully designed filter LL6, which effectively filters out the clutter and interference in the power grid and ensures the stable operation of the subsequent circuit.
The transformer rectifier filter voltage regulator circuit further transforms the voltage into AC28V and AC9V, and then after rectification, filtering and voltage regulation, it finally outputs DC5V and DC24V, providing a stable and reliable power supply for the entire working circuit. This design is not only simple in structure, complete in function, and easy to adjust, but also has automatic compensation for grid voltage and high anti-interference ability, so that the controller can still work stably and reliably under grid voltage fluctuations or high-intensity electromagnetic interference environments.
In terms of heating control methods, the adjustment of medium-frequency welding current is particularly critical. By switching the branches of the primary coil of the welding transformer, adjusting the number of turns, or controlling the phase of the primary voltage, the welding current can be accurately controlled. This method of phase control of the primary voltage and adjustment of the welding current is the essence of heating control of precision spot welding machines.
In addition, the importance of thyristor as a "switch" in precision spot welding machines is self-evident. It can not only realize the on-off switching of the primary current, thereby controlling the power-on time during welding, but also control the primary voltage of the transformer, thereby adjusting the size of the welding current. This flexible control method provides more possibilities and accuracy for the welding process.
With the continuous advancement of mechanical technology, the functions of single-chip microprocessors are becoming increasingly powerful and the price is more affordable. Compared with the commonly used metal sheet temperature control method, single-chip microprocessors have significant advantages in control accuracy, reliability and intelligence. Therefore, in the control system of precision spot welding machine, the application of single-chip microprocessor has become a trend and necessity.
In summary, the heating control method of precision spot welding machine is a complex system integrating filtering, voltage transformation, rectification, voltage stabilization, synchronization, program control, drive and pulse generation. Its precise design, efficient control and strong anti-interference ability have jointly created the excellent performance of precision spot welding machine in the field of welding.
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