SU995201A1 - Storage battery charging device - Google Patents

Description

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The invention relates to electrical engineering and can be used to operate batteries.

Chargers are known on the basis of a bridge rectifier and a discharge node, designed to charge a battery with an asymmetric current 1.

The closest to the proposed technical entity is a device for charging a battery, containing a valve rectifier bridge, a smoothing choke, a thyristor-throttle-capacitor discharge unit with a capacitor recharge circuit, switching thyristors connected between the input of the rectifier a bridging bridge and the device's output on the side of the smoothing throttle, and a connecting cable for connecting the battery.

The charging rectifier forms a smoothed constant current of increased density at the first charge stage. At the second step of charging, with an asymmetric current, the charging rectifier, together with switching thyristors, ensures the formation of a charged current pulse in the circuit of a charged battery, in the pauses between which the thyristor-throttle-capacitor node

discharge ensures the formation of discharge depolarizing current pulses with its LC oscillating circuit below. 5 action of the amount of EMF. battery and pre-charge discharge capacitor voltage 2.

In a number of cases, it is impossible to install near a charger and a battery, and the length of the connecting two-core cable reaches 100-150 m. In this case, its own inductance becomes commensurate with the inductance of the discharge throttle and affects the joint operation of the charge rectifier and switching thyristors. Due to the charge current pulses flowing through the cable, the current pulses in the latter create a supply of electromagnetic energy, which delays the switching of the charging current for the duration of the pause

20 from the battery circuit to the internal circuit, and the device becomes practically inoperative.

Claims (2)

In addition, with the simultaneous charging of several parallel branches of batteries, there is a large imbalance of charging currents. The purpose of the invention is to increase the reliability of the device. This goal is achieved by using a connecting cable in the device for charging the battery as the discharge throttle, and the output rectifier of the battery rectifier with a smoothing choke is shunted by a reverse diode, the LED. FIG. 1 and 2 is a schematic diagram of the proposed device. The device contains valves 1 - II, choke 12, capacitor 13, recharge circuit 14, cable 15 and runs on a battery 16. Thyristors I-16 are assembled in a valve bridge and form a charging rectifier 12 between the three-phase input the output of the device from the side of the smoothing drossel 12 connected switching thyristors 7-9. An output circuit of a series-connected thyristor 10 and a capacitor 13 is connected to the output terminals of the device, and through a two-core connecting cable .15 - an accumulator battery 16. At the first charge stage, thyristors 1-6 work, ensuring the formation of a constant charge current of increased density, smoothed to the required level by choke 12 and inductance of measuring cable 15. In the second stage of charging, asymmetric current with a frequency of 150 Hz is fed control pulses. Switching thyristors 7-9 connected to the de-energizing the currently reproducible branch. In this case, the rectifier current is switched to the auxiliary valve bridge 1, 3, 5, 7.8 and 9 while maintaining the continuity of the current flow in the smoothing choke 12. Since the connecting cable 15 also has a supply of electromagnetic energy that does not instantly interrupt the cable current 15 (and battery 16), the latter is closed through the reverse diode II, without moving the charging current from thyristors 2, 4 and 6 to thyristors 7, 8 and 9. At the same time, to avoid the influence of parasitic inductances on the switching process The resistors diode 11 must be connected directly between the combined anodes of thyristors 2, 4 and 6 and the connection point of the combined anodes of the switching thyristors 7-9 to the end of the smoothing throttle 12. After dissipating the electromagnetic energy stored in the cable 15 (for battery charge 16 ), a control pulse is applied to the discharge thyristor 10 and a discharge depolarizing current pulse is formed during the oscillatory overcharge of the LC circuit formed by the capacitance of the capacitor 13 and the inductance of measures After the discharge current pulse passes through a zero value, the thyristor 10 is locked and a reverse voltage is applied to it, equal to the difference between the overcharge voltage of the capacitor 13 and the emf of the battery 16. As the inductance of the cable 15 is determined by its type and the required length (measuring cable) it is equipped with the unit as a necessary force element with a constant inductance. Since the power of the reverse diode 11 is insignificant and it works only at the second dose meter stage, an LED can be used as it, which will simultaneously play the role of an indicator of the normal switching mode of switching thyristors 7-9. With simultaneous parallel charging of p 16 battery legs 16 and 1 b, the latter are connected to a n + 1 charger to ensure a uniform division of the asymmetric current across the battery m batteries (Fig. 2). Apparatus of the Invention A device for charging a battery, comprising a valve rectifying bridge, a smoothing choke, a thyristor-choke-capacitor discharge unit with a capacitor overcharge circuit, switching thyristors connected between the input of the rectifying bridge and the device output from the side of the smoothing throttle and a connecting cable for connecting the battery, characterized in that, in order to increase the reliability of the device, a measuring connection is used as the discharge throttle cable, and the output terminals of the charge rectifier with a smoothing choke are shunted by a reverse diode, which is used as an LED. Sources of information taken into account in the examination 1. Zorohovich AE and others. Devices for charging and discharging batteries. M., “Energie, 1975, fig. 7-9, p. 203. 2. USSR author's certificate as per jYo 2944555 / 24-07, cl. H 02 J 7/10, 06.23.80 (prototype). one Tg-T -T tt t Fg / g