SU1651357A1 - Capacitor charging device - Google Patents

Abstract

The invention relates to a pulse technique and can be used for charging capacitor capacitors used as sources of pulse power that are part of autonomous power sources. The aim of the invention is to increase efficiency and reduce weight and size parameters. The device contains a power source 1, a choke 2, a diode 3, a storage capacitor 4, comparison circuits 6 and 7, voltage reference sources 8 and 9, a transistor switch 5, a pulse generator 13. A ten meter counter is inserted in the device, combined with decoder 12, which, in combination with schembi 7 comparisons, connected through separating diodes 10 and 11 to the reset input, forms an unlocking sequence of pulses so that the energy stored in choke 2 is completely transferred to capacitor 4 in all parts of the charge curve. 2 Il.

Description

The invention relates to a pulse technique and can be used to charge storage capacitors, which are used as sources of pulsed power, which are part of the autonomous power sources of on-board systems.

The purpose of the invention is improving efficiency and reducing overall dimensions.

In FIG. 1 is a functional electrical diagram of a device for charging a capacitor; in FIG. 2 - diagrams of currents and voltages.

The device contains a constant voltage source 1 connected in series with the inductor 2 having windings 2.1 and 2.2 with a common point, a diode 3 and a storage 'capacitor 4. The common connection point of the inductor windings through a key transistor 5 is connected to the negative terminal of source 1. First inputs comparison elements 6 and 7 are connected to reference voltage sources 8 and 9, respectively, and the second inputs are connected respectively to the cathode of diode 3 and to the collector of transistor 5. The outputs of comparison elements 6 and 7 are connected through a separator diodes 10 and 11 to the reset input, counter 12, to the counting input of which the master oscillator 13 is connected. The output of the first discharge of the counter is connected through the amplifier 14 {power to the base of the key transistor 5.

The device operates as follows. .

When the power supply 1 is connected to the device, the generator 13 starts to work, the storage capacitor 4 is charged through the primary and secondary windings 2.1 and 2.2 of the metering inductor 2 and diode 3 to approximately the supply voltage. The voltage at the second input of the first comparison element 6 is less than the level set by the first reference voltage source 8 and the signal at the output of the first comparison element 6 is 0, the signal at the output of the second comparison element 7 is also 0. In this case, the duty cycle of pulses at Output 1 of counter 12 will be maximum and equal to C = 10. At time t (Fig. 26), a trigger pulse of duration T opens transistor 5. In the primary winding

2.1 throttle begins to increase current (Fig.2g). After the time T has passed, the transistor closes, the energy from the inductor 2 starts to be transferred to the capacitor 4. For a time equal to 9T, the energy from the inductor 3 is transmitted 99% to the storage capacitor 4. The waveform at the input of the comparison element 7 repeats the voltage across the capacitor 4. after the first 2-3 pulses when the capacitor voltage exceeds 4 and _P2 _ (2c), - a voltage source 9 is determined, the comparison element 7 is triggered and resets the counter at a time and holds it up until the throttle power reset occurs in cond nsator. When the voltage at the collector of the transistor 5 is lower and _П £ (Fig.2c) at the time tg, the counter starts, the transistor 5 opens, and the cycle repeats.

Thus, the duty cycle of the charge pulses of the capacitor 4 decreases with increasing voltage at the capacitor 4. Therefore, the energy stored in the inductor at all stages of the charge is completely transferred to the capacitor 4. As the charge, when the voltage across the capacitor 4 reaches U _{n <} (FIG. .2d), determined by the reference voltage source 8, the comparison element 6 is triggered and its signal resets the counter 12 to 0, the control pulses cease, the transistor 5 closes. When the load is connected and the voltage drops below a predetermined voltage, the capacitor 4 is recharged until the specified voltage is reached, this stabilizes the voltage across the capacitor and the current removed from the capacitor to the load.

Claims (1)

Formula A device for charging a capacitor containing two comparison elements, a pulse generator, a power amplifier, a DC voltage source, to the outputs of which a serial circuit is connected from the primary winding of the inductor and the transistor switch, the first output of the secondary winding of the drssel is connected through the anode-cathode of the diode to the first lining of the storage capacitor , the second output of the secondary winding of the throttle under the keys to the connection point of the collector of the transistor key with the primary winding of the throttle, the second lining of the accumulator the capacitor is connected to the negative terminal of the DC voltage source, the first inputs of the comparison elements are each connected to its own reference voltage source, the second input of the first comparison element is connected to the junction point of the diode cathode with the first capacitor plate, the output of the power amplifier is connected to the transistor base 357 that, in order to increase efficiency and improve weight and size characteristics, a decimal counter combined with a decoder and two ί 'separation diodes are introduced into the device, the second input of the second comparison element is connected to the collector of the key transistor, the outputs of the first and second comparison elements 0 are connected through separation diodes to the counter reset input, the master oscillator is connected to the counting input, the output of the first discharge of the decoder is connected to the amplifier