SU1718366A1 - Capacitor charger - Google Patents

Abstract

The invention relates to a pulsed technique and can be used, for example, in pulsed current sources with capacitance stored energy. The purpose of the invention is to increase the efficiency while increasing the charge rate of the capacitive energy storage device by transferring most of the energy to it in the first charge stage, which is provided by synchronous switching on of the thyristors 11-14 with their subsequent diagonal switching on. The charge of the capacitor 10 is carried out from the source 5 through the choke 8, diode 7. 2 Il.

Description

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The invention relates to a pulsed technique and can be used, for example, in pulsed current sources with a capacitive energy storage.

The purpose of the invention is to increase the efficiency while simultaneously increasing the charge rate of the capacitive energy storage device by transferring to the storage device most of the energy in the first charge stage.

FIG. 1 shows the structural electrical circuit of the device; in fig. 2 diagrams for the operation of the device.

The device for charging the capacitive energy storage device contains a thyristor bridge 1, in the first diagonal of which the first capacitor 2 is connected, the first output of the second diagonal is connected to the cathode of diode 3 and to the first output of the first cable 4, constant voltage source 5, the second diode 7, second 8. Third 9 chokes, second capacitor 10, the potential lining of which is connected to the second output of the second diagonal of the thyristor bridge 1, the anode of the second diode 7, the first output of the second throttle 8, the second output of which The second terminal of the first throttle 4 is connected to the anode of the first diode 3 and through the third choke 9 is connected to a capacitive energy storage device b.

The thyristor bridge is made on thyristors 11-14.

The device works as follows.

When the source 5 is turned on, the thyristors are locked and the capacitor 10 is charged through the choke 8 to a voltage equal to the voltage of the source 5, since when the voltage on the choke 8 passes through zero, the choke is shunted by the diode 7. At the moment to (Fig. 2) a signal is given the unlocking of the thyristors leads to the charge of the capacitive accumulator 6 from the capacitor 10 and the source 5 with a frequency determined by the equivalent capacitance of the capacitor and the accumulator and the total inductance of the chokes to a voltage, the value of which depends mainly on the ratio of capacitance capacitor 10 and accumulator 6. Diode 3, shunt the choke 4 when changing polarity on it, prevents an excessive increase in the voltage on the drive compared to the voltage on the capacitor 10 at the end of this charge level, and the choke 9 provides a slight excess on the drive 6 to securely lock the thyristors at the end of the stage. After locking the thyristors of the bridge (ti), the capacitor 10 is recharged until the voltage of source 5. At time t2, a triggering pulse is applied to the thyristors located in the common-mode arms of the bridge, such as thyristors 11 and 12, and after the charge of the capacitor 2 and accumulator

6 before the voltage of the second stage and the discharge of the capacitor 10 when the thyristors 11 and 12 are locked, at the moment ta, an unlocking pulse is applied to the thyristors 14 and 13, after opening of which the accumulator 6 is charged by the total voltage of the capacitors 10 and 2. A turn on of the thyristors located in different arms of the bridge, the dosed charge of the accumulator is carried out in decreasing portions

energy at the expense of a stepwise decrease in the voltage of the capacitor 2. After the required voltage is reached at the capacitive storage, the bridge thyristors are locked and the storage device is discharged to a pulse load, after which the charging cycle is repeated.

The capacitance value of the capacitor 10 is usually chosen greater than the value of the storage capacitor b, in order to transfer at the first stage most of the energy stored in the storage device during the charge cycle. The storage tank capacity 6, in turn, is several times larger than the capacity of the capacitor 2, therefore the frequency of the charge in the first stage is significantly lower than the frequency of the stages with metered charge and the time of the metered charge usually constitutes a smaller part of the charge cycle. Under these conditions, the number of thyristor inclusions is significantly reduced, therefore, the charge rate increases, the active losses decrease, and the efficiency of the charger increases. By reducing the frequency of the charge current over most of the charge

the cycle makes it possible to use low-frequency thyristors, which reduces the cost of the device.

Claims (1)

Claims A device for charging a capacitive energy storage device containing a thyristor bridge, in the first diagonal of which the first capacitor is connected, the first output of the second diagonal is connected to the cathode of the diode and the first output of the first cable, the constant voltage source, characterized in that in order to increase the efficiency and charge rate of the capacitive energy storage, a second diode, a second, third choke, a second capacitor, the potential lining of which is connected to the second output of the second agonali thyristor bridge, an anode of the second diode, the first home conclusions second choke and the second terminal of which is connected to the cathode of the second diode, and the DC source output voltage, a second terminal connected to the first choke the anode of the first diode and through the third choke is connected to a capacitive storage energy. tf ti ty FIG. 2