SU864540A1 - Current pulse generator - Google Patents

Description

The invention relates to a pulse technique, namely to devices representing an impulse generator, and can be used for surface heating. Known current pulse generator, power source, to which a capacitive energy storage device is connected, a controlled switch connecting a capacitive storage device with a matching device fl. The disadvantage of the known device is limiting the possibility of heating the metal for quenching with a higher self-cooling rate, providing a fine-grained structure that promotes hardness. . This is due to the fact that the heating of the metal requires the energy that is stored in the capacitive storage device due to its capacity. The increase in capacitance leads to a decrease in the frequency of the pulsed current. A decrease in frequency causes an increase in the depth of heating, since a layer of considerable thickness is heated, the rate of its cooling decreases. Obtaining the same energy by reducing the capacitance and increasing the charging voltage necessitates the creation of a bulky and expensive static boost-rectifier device. The closest to the invention in its technical essence is the current-pulse current generators, containing the source of the same, to which the capacitive energy store is connected, a switch that enhances the matching device, the primary winding of which is connected through a switch with a capacitive drive, energy, charging choke with a ferromagnetic core, a frequency-setting capacitor connected through a charging choke to the secondary winding of a step-up matching device, controlled switch, step-down matching device The primary winding of which is connected via a controlled switch with a frequency setting capacitor, as well as a sensing element connected in parallel to the frequency setting capacitor, the output of which is connected to the input of the driver, the output of which is connected to the input of the control unit of the controlled switch 23. The disadvantage of this device is a decrease performance

while ensuring reliable operation of the generator. This is due to the fact that in order to ensure the reliability of the device operation, it is necessary to limit the discharges of the current-frequency capacitor passing through the controlled switch. Otherwise, the switch will quickly go out of order and the generator will not work. The limitation of the discharge current reduces the power output, which leads to a decrease in performance.

The purpose of the invention is to increase productivity while maintaining the reliability of the generator.

The goal is achieved by the fact that a current pulse generator containing a power source to which a capacitive energy storage device is connected, a switch that enhances the matching device, the primary winding of which is connected via a switch to a capacitive energy storage device with a ferromagnetic core, a frequency-creating capacitor connected through the charging choke with the secondary winding of the step-up matching device controlled switch, step-down matching device, primary winding is connected via a controlled switch with a frequency-creating capacitor, as well as a sensing element connected in parallel with the frequency, decanting capacitor, the output of which is connected to the input, specifying devices, the output of which is connected to the input of the control unit of the controlled switch, at least one more is entered a managed switch and another primary winding of the down-matching device, which form a series chain connected to each other, connected in parallel to the frequency-ejected capacitor, and - this primary windings of the step-down matching device are connected inductively with each other through its secondary winding. The drawing shows the electrical circuit of the pulse current generator.

The generator contains a power source 1, to which a capacitive drive 2 is connected, which through a switch o is connected to the primary winding 4 of a step-up matching device, the secondary winding 5 which through a charge} with a ferromagnetic core, is connected to a frequency defining capacitor 7, reducing the matching a device which is, for example, a magnetic field concentrator with a secondary winding 8 in the form of one discharge coil and at least two primary windings 9 and 10, laid in a groove The secondary windings are 8. The primary windings 9 and 10 are inductively coupled to each other through

secondary winding 8, which in turn is inductively connected to workpiece 11, at least two controllable switches 12 and 13, which form corresponding sequential chains with primary windings 9 and 10, in turn, these successive chains are interconnected in parallel and connected to the frequency setting capacitor 7, parallel to the frequency setting capacitor 7 is connected the sensitive element 14 of the setting device 1b, the setting device 1b and the controlled switches 12 and 13 are connected to the control unit 16.

The generator works as follows,

After charging the capacitive drive 2 from the power source 1, the switch 3 is triggered, as a result of which the capacitive drive 2 is discharged to the primary winding 4 of the step-up matching device. Induced in the secondary winding 5 of the step-up matching device, the current passing through the charging choke 6, equipped with a ferromagnetic core, is the charging current of the frequency defining capacitor 7. The voltage amplitude of the load frequency capacitor 7 is significantly higher compared to the amplitude of the discharge voltage of the capacitive accumulator 2 at the expense of raising the matching device. The sensing element 14 of the driver 15, reacting to the magnitude of the charging voltage, provides a signal through the driver 15 to the control unit 16, which sends out a control pulse to the control switches 12 and 13 at the moment when the charging current of the frequency setting capacitor 7 drops to almost zero. Since there is always a variation in the time of formation of the discharge, the breakdown of one of the controlled switches, for example, the controlled switch 12 will occur earlier. After the control switch 12 is triggered, a current begins to flow through the primary winding 9 of the downstream matching device, which induces it to the secondary winding 8. This induced current induces an emf in its primary winding 10, which leads to an increase in potential difference across the ynpaBjmeMoro electrodes of the switch 13. a growth with excess compensates for a certain decrease in the voltage on the electrodes of the controlled switch 13 due to the operation of the controlled switch 12 and leads to the breakdown of the controlled switch 1 3. Thus, the discharge current of the frequency-generating condensate jropa 7 is split in half and these smaller

Claims (1)

Claim A current pulse generator comprising a power source to which a capacitive energy storage device is connected, a switch, a boosting device, the primary winding of which is connected through a switch to a capacitive energy storage device, a charging choke with a ferromagnetic core, a frequency-setting capacitor connected through a charging choke with a secondary winding of the boosting matching devices, controlled switch, lowering matching device, the primary winding of which is connected through the control switch a torus with a frequency-setting capacitor, as well as a sensitive element connected in parallel with a frequency-setting capacitor, the output of which is connected to the input of the master device, the output of which is connected to the input of the control unit of the managed switch, characterized in that, in order to increase productivity while maintaining reliability, the generator is introduced at least one more managed switch and one more primary winding of the step-down matching device, forming a series circuit between each other, connected in parallel with the frequency-setting capacitor, while the primary winding of the lowering-matching device is inductively coupled to each other through its secondary winding.