SU892673A1 - Device for charging reservoir capacitor - Google Patents

Description

one

The invention relates to a pulse technique and can be used to charge storage capacitors in high-power pulse generators that feed optical quantum generators, plasma engines, welding units, etc.

A device for charging a storage capacitor is known, which contains charge thyristors, metering capacitors, a charge choke, and a storage capacitor fl.

The disadvantage of this device. The reliability of operation is relatively low.

The closest to the technical essence of this invention is a device for charging a storage capacitor, comprising two metering capacitors, an input and a two-winding output chokes, seven thyristors and two C23 diodes.

The disadvantages of this device (; tva are connected, first of all, with the recovery of residual energy from the metering capacitors to the output choke, which play the role of an inductive storage device having a low efficiency, which can be increased only by increasing the mass of the throttles In addition, during each dosing cycle, the current stored in the output choke is transferred from the branch of one thyristor to the branch with another thyristor. As a result, the di / dt values in five of the seven thyristors are increased, which leads to overheating. This causes additional

ts deterioration of efficiency and increase in the mass of heat radiators.

The purpose of the invention is to increase the efficiency and improve the mass and overall performance.

20 devices.,

This goal is achieved by the fact that in the device for charging the storage capacitor, containing the first

and the second metering capacitors, the first plates of which are connected to the negative pole of the power source, the first and second thyristors, the anodes of which through the first choke are connected to the positive pole of the power source, the third and fourth thyristors, the cathodes. Which are connected to the first output of the primary winding of the second throttle and the cathode the fifth thyristor, the sixth and seventh thyristors, the anodes of which are connected to the second output of the primary winding of the second droselle and the anode of the first diode, the cathode of which is connected to the negative field ohm power source, the second plate of the first metering capacitor connected to the cathode of the first, the third anode and cathode of the sixth thyristors, the second plate of the second metering capacitor connected to the second cathode, anode, fourth and the cathode of the seventh thyristors, and the secondary winding of the second drossel is connected an additional capacitor and an eighth thyristor are introduced, and an additional capacitor is connected between the cathode of the first diode and the junction point of the anode; a thyristor with the cathode of the eighth thyristor, the anode of which is connected to the second terminal of the primary winding of the second choke.

The drawing shows a circuit diagram of the device.

The device comprises a first choke 1, through which the anodes of the first and second thyristors 2 and 3 are connected to the positive bus of the power source. The thyristor cathodes 2 and 3 are connected respectively to the anodes of the third and fourth thyristors t and 5 and the first plates of the first and second metering capacitors 6 and 7, the second plates of which are connected to the negative power source, the cathode of the primary diode 8 and the first plate of the additional capacitor 9. Cathodes thyristors 4 and 5 are connected to the first output of the primary winding 10 of the second throttle 11 and the cathode of the fifth thyristor 12. The second output of the winding 10 is connected to the anode of the diode 8 and the anodes of the sixth and seventh thyristors 13 and 14, the cathodes of which are connected respectively to the cathodes of the thyristors 2 and 3. The anode of thyristor 12 is connected to the capacitor plate 9 vtroy and

the cathode of the eighth thyristor 15, the anode of which is connected to the second terminal of the winding 10 of the throttles 11, the secondary winding 16 of which through the second diode 17 is connected to a storage capacitor 18.

The device works as follows.

In the initial position, the voltages on the capacitors 6.7 and E are zero. When the device is turned on in the block

Controls (not shown) Lorni and Un Un pulses, shifted in time, relate each other by a time ut equal to half the device's operation period. Impulses u- come on

the inputs of the thyristors are 2.5 and 15, and the pulses are the inputs of the thyristors 3, and 15. In addition, control pulses U are generated in the control unit.

and and

pulsed against pulses

at time At (7utxi, and impulses U.

The control pulses U are fed to the inputs of the thyristors 13.1 and 12, and the pulses and to the inputs of the thyristors 12 and 15, for the duration of the pause in the charge cycles of the storage capacitor 18.

When the pulse Q is applied, the thyristor 2 opens and the oscillating charge of the metering capacitor 6 occurs up to twice the voltage of the power source. Tiris.tori 5 and 15 do not open, as the voltage on the capacitors 7 and 9 are equal to zero. For the same reason, thyristors 12 and 1 are not opened when a control pulse U (|.

When the pulse Urj arrives, the thyristor 3 opens and the oscillating charge of the second metering capacitor 7 occurs to double the voltage of the power source. At the same time, the first output thyristor 2 is closed, the thyristor 4 is opened, and an oscillating resampling of capacitor 6 along the circuit occurs:

Claims (2)

thyristor 4 - winding 10 droplets 11 diode 8 - capacitor 6. At the moment when the reverse voltage on capacitor 6 exceeds (taking into account the transformation ratio of droplets 11), the voltage on the storage capacitor 18 is the last to charge across the circuit: winding 16 droplets 11 diode 17 - capacitor 18. These processes will proceed before the arrival of an ultrasonic pulse at the supply of which thyristors 12 and 13 are opened, which will cause the thyristor to close t. From this moment, the oscillating discharge of the first metering capacitor 6 along the circuit will begin: capacitor 6 capacitor 9 thyristor 12 - winding 10 droplets 11 - thyristor 13. When the voltage on the capacitor 6 reaches a nearly zero level, the thyristor 13 closes and diode 8 opens and the energy stored in choke 11 is completely transferred to condenser 9 through a circuit: diode 8 - capacitor 9 - thyristor 12. Upon completion of this process, the thyristor 12 closes. When the next control is applied, the thyristor 2 is reopened by a pulse, through which the oscillating charge of the capacitor 6 occurs until the voltage of the power supply is doubled. At the same time, thyristors 5 and 15 are opened and capacitor 7 is re-discharged along the circuit: second thyristor 5 — winding 10 droplets 11 — thyristor 15 — additional capacitor 9 — capacitor 7 When the voltage on capacitor 9 reaches almost zero, the thyristor 15 closes and diode 8 opens, and then the discharge of the capacitor 7 occurs along the circuit: thyristor 5 - winding 10 droplets 11 diode 8 - capacitor 7. From the moment when the reverse voltage on the capacitor 7 exceeds (taking into account the transformation ratio of the chokes 11), the voltage on the accumulator After the capacitor 7 is re-discharged, further charging of capacitor 18 through diode 17 will begin. These processes will occur before the pulse arrives and, when supplied, will open thyristors I and 12 /, which will cause the thyristor 5 to close and oscillator discharge 7 along the circuit: capacitor 9 - thyristor 12 winding 10 droppers 4 - thyristor 1L - capacitors 7. When the voltage on the capacitor 7 reaches almost the left level, the thyristor I closes and the energy stored in the choke 11 is completely transferred to the cond nsator 9 Chains diode 8 - capacitor 9 - thyristor 12 - 10, the choke coil 11, At the end of this process, the thyristor 12 is closed. Further, the processes described above are repeated many times. When this happens, the charge capacitor 18 is charged to a predetermined voltage level. Due to zero initial conditions on the metering capacitors 6 and 7 during each dosing cycle, this charge is carried out with a constant power take-off from the power source. During a pause in the charge cycle of the storage capacitor 18, a control pulse 1A is applied to the inputs of the thyristors 12 and 15. At the same time, energy from capacitors 6 and 7 is transferred oscillatingly to choke 11 and stored in it as a kind of current flowing through the circuit: thyristor 15 thyristor 12 - winding 10 throttles 11. When the charging cycle is resumed, the control impulse U. the energy stored in the choke 11 during the pause period is also removed, transferred to the storage capacitor 18, as described above. a Thus, the introduction of thyristic; re 15 and an additional capacitor 9 made it possible to accumulate the residual energy of the metering capacitors not in the output choke, but in the additional capacitor, which in turn made it possible to reduce it. the constant component of the current in the choke 11 and reduce the values of dt / dt in thyristors V, 5,12,13 and. This led to a corresponding increase in efficiency and an improvement in the overall dimensions of the device. The invention The device for charging the storage capacitor, comprising first and second metering capacitors, the first plates of which are connected to the negative pole of the power source, the first and second thyristors, the anodes of which through the first choke are connected to the positive pole of the power source, the third and fourth thyristors, the cathodes of which connected to the first output of the primary winding of the second throttle and the cathode of the fifth thyristor, the sixth and seventh thyristors, the anodes of which are connected to the second output of the primary winding and the second throttle and the anode of the first diode, the cathode of which is connected to the negative pole of the power source, the second lining of the first metering capacitor is connected to the first cathode, the third anode and the sixth thyristor cathode, the second side of the second doping capacitor is connected to the second cathode, fourth anode and the cathode of the seventh thyristors, and the secondary winding of the second throttle through the second diode is connected to a storage capacitor, characterized in that, in order to increase the efficiency uluchshe8 audio and mass-dimensional parameters, introduced an additional capacitor and an eighth thyristor, wherein an additional capacitor is connected between the cathode of the first diode and the anode point compounds fifth thyristor with the cathode of the eighth thyristor, the anode of which is connected to the second terminal of the primary winding of the second choke. Sources of information taken into account in the examination 1. Problems of technical electrodynamics, 1970, No. 2, Kiev, IED AN SSSR, p. 103 2. USSR author's certificate №, cl. H 03 K 3/53, 1977. / ETC HS L4 / 7 -Kp and J V5 au F5 four,