SU432994A1 - CONDENSING MACHINE - Google Patents

Description

one

The invention relates to capacitor resistance welding, and can be used when operating at low charging voltages.

Condenser resistance welding devices are known, comprising a charging transformer, a rectifier, a charge and discharge thyristors, a capacitor bank, a stabilized voltage source, parallel to the output of which a voltage divider and a welding transformer are included.

The purpose of the invention is to increase the stability of low-energy on-charge charging of a battery of capacitors.

To do this, the output of the stabilized voltage source is connected to the terminal "minus the capacitor battery" by its minus and to the midpoint of the divider voltage and to the "plus terminal of the capacitor battery" is the input of the relaxed generator, the output of which is connected to the charge thyristor control circuit.

The drawing shows a schematic electrical diagram of the proposed machine.

The circuit of the machine contains a charging transformer 1, in the secondary circuit of which a current-limiting capacitor 2 is connected, a bridge rectifier 3. connected to the charging thyristor 4 and a battery of capacitors on

2

electrolytes 5, shunted by diode 6, discharge thyristor 7 and welding transformer 8; the thyristor control electrode 7 is connected via a start button 9 with a voltage source 10, a stabilized voltage source consisting of a dynstor 11, a capacitor 12 and a zener diode 13, the output of which is shunted by a divider 14; In addition, the output of the specified stabilizing voltage source is connected to a relaxation generator having a resistor 15, a capacitor 16, a dynistor 17 and a pulse transformer 18, the secondary winding of which is shunted by a diode 19 and connected to the control circuit of the charge thyristor 4, the power switch - a toggle switch 20.

With the following: Mykanin of the toggle switch 20, the network voltage is applied to the transformer 1, and a firing line appears at the output of the stabilized voltage source - divider 14-. Since the capacitor battery 5 is discharged at the first 1 time, all the voltage removed from the output of the divider 14 is applied to the relaxation generator on the dynistor 17. The perodic charge of the capacitor 16 starts through the resistor 15 and discharges it through the switching on distor 17 and the nervous winding an impulse transformer 18.

Parameters 14, 15, 16 and 17 are chosen so; to, so that the condition is always met

/R. ,

where hp is the frequency of the relaxation generator; / s - mains frequency.

By virtue of this ratio, a clear inclusion of charge thyristor 4 in each semi-ariod of the network voltage is provided. In this case, the capacitor battery begins to charge from the rectifier 3 through the current-limiting capacitor 2, and the voltage applied to the bottom wall will decrease as the capacitor battery charges. The latter occurs due to the indicated feature of including a stabilized voltage source and a relaxation generator on the dynistor 17. At the moment when the specified voltage on the capacitor bank 5 reaches the specified voltage,

r t / - s

LI with -

where E is the voltage taken from the output of the divider 14; Yas - preset voltage level

capacitor bank; Yad1 is the dynistor trigger voltage 17.

At the moment of equality of voltage, the relaxation generator on dnnistor 11 stops the production of imulses. post} firing on the control electrode of the thyristor 4, which is turned off, disconnecting the battery of capacitors 5 from rectifier 3; Charge is stopped.

After switching off the charging thyristor 4, the charging voltage of the battery of capacitors 5 begins to decrease due to the presence of leaks. At the moment when the voltage difference E - Yao becomes greater than the tripping voltage of the diode 17, the relaxation generator again begins to generate pulses that turn on the charge thyristor 4; the capacitor battery is recharged to

the pre-selected voltage value, and so on. ft.

Such a mode of operation of the circuit can be maintained as long as necessary, until with the help of button 9 the discharge thyristor 7 is switched on and the capacitor bank 5 is discharged to the welding transformer 8.

After discharge of the capacitor battery, the duty cycle of the circuit is repeated.

The subject and s obretep

Capacitor Welding Machine, containing charge transformer, capacitive

current limiting element, rectifier, charge and discharge thyristors, relaxation generator, capacitor bank, welding transformer and stabilized voltage source, parallel to the output of which a voltage divider is included, in order to increase the welding process stability, the output of the stabilized voltage source, its minus is connected to the terminal "minus the capacitor battery, and to the midpoint of the voltage divider and to the terminal" plus the battery of capacitors is connected a relaxation input generator, the output of which is connected to the control circuit of the charge thyristor.

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