WT-A/380-2 microcomputer controlled thyristor AC voltage regulating power supply can also be used as induction melting furnace rectifier. It is a intermediate frequency induction melting furnace equipment specially designed for the corresponding power level. And the design of a new type of voltage regulation power supply device. Hereinafter referred to as "type 2 microcomputer voltage regulating power supply device" or "this device".

The meaning of the symbol is: WT represents microcomputer voltage regulation; A represents rated current of high-frequency intermediate frequency furnace equipment with corresponding power level; the unit is amperometric (A), specific parameters see Table 1: 380 for rated input line voltage, The unit is volt (V): 2 for design serial number. This device is the second generation microcomputer voltage regulating power supply device in our factory.

1、Characteristics of Type I, 2 Microcomputer controlled Voltage regulating Power supply

The core of the control part of the induction melting furnace is 8031 single chip microcomputer, the peripheral is equipped with programmed memory, A / D conversion circuit, programmable logic circuit, drive and protection circuit, etc. All kinds of functions required for voltage regulation power supply are completed, and the performance is reliable and the debugging is simple. Advantages such as ease of use. The details are as follows:

 The functions of synchronization, phase division, phase shift and equal spacing trigger are realized by using the characteristics of single chip microcomputer and various command functions. All of these are done automatically by the microcomputer, without manual debugging and intervention, which overcomes the inaccuracy of the discrete element trigger system due to the dispersion of component parameters, temperature drift and debugging means. Causes the trigger pulse uniformity degree difficult to guarantee the flaw.

 the steady voltage link also adopts the software control. The given signal and feedback signal are converted into digital signal and sent to the single chip microcomputer. The single chip microcomputer automatically adjusts the pulse trigger angle after the given and feedback signal is processed to achieve the purpose of voltage stabilization. Because the given voltage is obtained from the precise reference voltage, and is not affected by the voltage fluctuation and temperature of the power network, the given and feedback system is filtered on the circuit and in the software. Therefore, the anti-interference ability and long-time stability of the system are greatly improved.

The optoelectronic isolation technology is used in the control system, which enhances the anti-interference ability of the system.

Taking advantage of software, soft start technology is adopted to prevent excessive impact on SCR, high integrated transformer and high voltage silicon stack, and prolong the service life of equipment.

A reliable protection system. When main circuit failure or program "walk", the system can quickly block the output voltage and display.

The device has a spare interface, which can add or change some control functions according to the needs of the user (the user needs to explain when ordering, so that the software can be programmed).

Technical parameters:

For high integrated transformer, high voltage silicon stack parameters used in conjunction with the corresponding power grade high frequency if furnace equipment, please refer to Table 1

When the three-phase input voltage is rated 380V, the thyristor output voltage is transformed into DC high voltage by high integral transformer boost and high voltage silicon stack rectifier under the condition of high integral transformer connected 380V/Y10KV. Its no-load voltage regulation range is 1-13.5 KV, with load adjustment range of 0-12.5 KV.

When the rated input power supply voltage is 380 V ±10, the stability of DC high voltage (anode high voltage) is not greater than ±2.

   Table 1