SU546994A1 - Device for charging battery with asymmetric current - Google Patents

Description

one

The invention relates to the field of electrical engineering, in particular to devices for battery charging.

A device for charging an accumulator with a thorium battery is known to have an asymmetric current, which contains a source of non-shock current, a controlled rectifier, a charging and a discharge circuit, the discharge circuit being designed as a series-connected controlled valve and a capacitor connected in accordance with the battery and charged through the choke from the additional rectifier 1J.

It is also known a device for charging a battery with an asymmetric current, comprising a charging rectifier based on an adjustable autotransformer with two groups of moving current-collecting contacts and an output smoothing choke and a negative-discharge discharge current assembly, consisting of successively connected Throssel, thyristor and a capacitor, the recharge of which is accomplished by a valve-throttle bypassing it 2.

The disadvantages of the known devices are the possibility of interruptions of the formation of an asymmetric current and shorting of the battery of batteries along a circuit formed by series-connected choke, thyristor

and recharge by a single valve throttle chain.

To increase reliability, reduce the installed capacity of the elements of the device and to increase its efficiency, i. In the proposed device, the recharge of the chain is made in the form of the secondary winding of the smoothing throttle connected through an additional rectifier directly to the single capacitor plate and through the zero point of the transformer and the cathode group of the rectifier valves to the other capacitor plate.

FIG. 1 and 2 are given the basic circuits of the described device.

The device (see Fig. 1) contains an autotransformer 1, chokes 2 and 3, diodes 4-10, thyristor 11 and capacitor 12. Autotransformer 1 has two groups of substrates, x current-collecting contacts, one of which is connected to an anode group of diodes 4- 6, and to the other, a cathode group of diodes 7–9, which form a three-phase open bridge rectifier with a smoothing choke 2 at the output. In parallel to the output terminals of the rectifier, a node for the formation of negative - discharge current pulses, consisting of successively connected droplets 3, thyristor 11 and capacitor 12, is connected, and the battery charge

13. Common point of connection of the thyristor cathode

11 and coiderizer plates 12 are connected via successively connected diode 10 and the secondary winding of the smoothing throttle 2 to the zero point of the autotransformer 1.

A rectifier based on a three-phase autotransformer 1, diodes 4-9 and a smoothing droplet 2 provides rectification of the voltage of the battery and the charge of the battery 13 with a constant smoothed current.

Let in steady state at time i Q the voltage across the capacitor plates

12 corresponds to that indicated in FIG. 1. When a control pulse is applied to the thyristor And the capacitor 12 is recharged along the circuit: capacitor 12 - thyristor AND-choke 3 - battery 13, through which the current of a small duration and large amplitude, which is small, flows The bottom of the battery 13.

After the capacitor 12 recharges to a voltage of opposite polarity and the discharge current pulse passes zero, the thyristor I is locked and a reverse voltage is applied to it equal to the difference of the voltages on the capacitor 12 and the battery 13. As it is The capacitor 12 is simultaneously and direct to diode 10; the capacitor is re-recharged along the circuit: capacitor 12 - diode 10 - secondary Obstruction of the smoothing throttle 2 - transformer windings 1 - anode group diode Dov 4-6 - primary winding smoothing throttle 2 - battery torn battery 13. Total ed. s., acting in this m circuit, it is defined as the difference between the sum of the voltages of the capacitor 12 and the three-phase half-bridge rectifier 4-6 and the counter voltage e. d. battery.

Under the action of the total ed. with. In this circuit, a recharge current of the capacitor 12 flows, which is simultaneously charged for the battery 13, i.e., the discharge energy stored in the capacitor is now used for additional charging of the battery.

After the capacitor 12 is recharged to the voltage of the original polarity indicated in FIG. 1, the diode 10 is closed and the process of the operation of the node for generating negative current pulses is repeated.

Due to the fact that the recharge current of the capacitor flows through the battery, the energy of the discharge is recovered back to the battery for its additional charge during the flow of positive current pulses, and therefore, the charge efficiency increases. .

By connecting the recharge circuit between the plate of the capacitor 13 and the zero point of the autotransformer 1 is eliminated

the possibility of short-circuiting the battery by the internal circuits of the charger and the reliability of its operation is increased. This makes it possible to reduce not only the rated power of the recharged and smoothed: 1- willow; generally chokes (in the known circuits, their inductance must be chosen not from the condition of smoothing currents, but from the condition of stable switching of the thyristor

And), but also the rest of the elements of the node for the formation of negative impulses (do not need a supply of mine; post, based on possible failures of the formation of the thyristor 11) Additional reduction set

power and size reduction of the device are provided by performing smoothing and recharging chokes in the form of a double-wound throttle on a common magnetic core, and both by combining two

chokes in one and due to the influence of mutual induction, which allows to reduce the number of turns of the windings.

FIG. 2 shows a device in which the rectifying diode 10, which is a single-phase single-half-rectifier (with respect to the voltage of the capacitor 12), is replaced by a single-phase full-wave rectifier 14, made, for example, according to a bridge circuit. This implementation

the rectifier allows using it simultaneously not only to recharge the capacitor, but also to increase the total em. with., acting in the circuit recharging yes capacitor.

A two-half-period single-phase rectifier provides an additional rectification of the alternating voltage of nulsation released on the secondary winding of the smoothing throttle 2 as it flows into its front

the primary winding of the rectified primary charge current. The rectified voltage is added to the voltage m on the capacitor, thereby providing a recharge of the latter to more than a high initial voltage, which allows a significant increase in the amplitude of the negative and current pulses, especially at low voltages of the charged battery. battery 13. In order to smooth out the ripple voltage of the pulsation, as well as to ensure the reloading conditions, the full-wave rectifier 14 must include an output choke. To make it possible to control the negative - discharge current pulses, the recharge rectifier 14 can be made controlled.

Claims (2)

1. Author's certificate LL 404146, cl. H 02J 7/10, 1973. 2. Author's certificate LL 430454, cl. H 01t 45/04, 1974 (prototype). TTT to t $ 5 A SU  I 1 - triT r1 ..A, C A 3 GG-  I I ynp n h V /; I / y 1 " i - .. j., .i sagst i