SU532933A1 - Device for charging battery with asymmetric current - Google Patents

Description

The invention relates to rechargeable batteries and may find application in the development of systems for forming and charging batteries.

Chargers are known that provide battery charge with asymmetric alternating current from single- and three-phase AC sources.

In the simplest device for charging a battery from a single-phase AC source, the AC component is superimposed on the half-wave rectifier current.

These devices have very low power indices and do not use them when charging batteries from three-phase sources. A device containing two diodes and a magnetic amplifier connected together with a capacitor on the secondary side of the transformer is also known. It involves connecting the phases of the source to the star and the zero wire of the star, which is not always possible. In addition, the size and weight of the magnetic amplifier designed for the working (charge) current commensurate with the size and weight of the power transformer, and the efficiency and the power factor of such a device is very low; therefore, the energy, including specific, characteristics have low values. Obviously, such a charging device cannot be used to charge a battery from an AC source, the windings of which are connected by a triangle.

as well as from windings connected in a star without zero output. A significant disadvantage of these devices is the presence of a capacitor in the line conductor, which prevents the flow of battery current.

5The charging device is also known, which contains one current-limiting capacitor, one valve element-diode and three terminals connected to the battery in such a way that the first source terminal is connected to the battery minus and the other two with a plus, respectively, through a capacitor and

0 diode. In this device, a substantial asymmetry of the currents consumed from the AC source is observed.

The energy performance of a contagious device as a whole can be improved if the battery

5 charge with asymmetric alternating current using the current of all phases of the source of alternating current dp battery charge. This also reduces the unevenness of the loaded phase of the source and increases the efficiency. and power factor at battery charge.

The purpose of the invention is to improve the energy performance of the device.

Claims (2)

Dp of this supposed device is equipped with an additional capacitor and two valves, for example, thyristors, one of which is connected between the first source terminal and the negative capacitor, and the other between the negative terminal of the battery and the second terminal. FIG. 1 shows the scheme of the device; Fig 2-4 the same, different options. Terminals 1, 2 and 3 are sources of alternating current (see Fig. 1), connected to battery 4 via a current limiting capacitor 5 and valves 6.7 and 8. Between the first source terminal and the negative terminal of the battery, i.e. parallel to valve 7, a current-limiting capacitor 9 is turned on. As the valves 7.8, thyristors are used, which must be controlled from a battery voltage control unit () i.e. shown) made according to any known scheme. In the device shown in FIG. The 2-valves are the usual diodes 10 and 11 and this device is equivalent to the device shown in FIG. 1 with open thyristors 7,8. -. Ori reviewing the operation of the charging device (Fig. 1), assume that the thyristors are open (under this condition, y, the struts, shown in Figs. 1 and 2 are equivalent). Then, in the presence of voltages, nickel circuits 1,2 and 3, the current of phase 1-3 charges the battery through diode 6 and valve 7, and the current of phase 2-3 charges the battery through diode 6 and valve 8. The current of phase 1-2 recharges the battery through the capacitor 5 and the valve 7 during the half-period, when positive voltage is on the terminal 2, and negative on terminal 1, in the next half-period the polarity of the voltage 1-2 changes to the opposite and the battery capacitor 5 and 9. During the second half-periods of the alternating voltages of phases 1-3 and 2-3, the capacitor 9 is discharged to the battery, giving it a charge hay j energy. Co11; |, Sensor 5 gives off energy when phase 1- 2. Thus, all the phases of the source are loaded on the battery and, together with the current-limiting capacitor, form an asymmetrical over-Metriibrfi current, the constant component of which charges the battery. Using the thyristor 7.8 to change the angular duration of the flow of the charging current, it is possible to adjust the value of the constant coherent current of this current. The simplified versions of the devices considered are the devices shown in FIG. 3 and B of the charging device of FIG. 3, the first source terminal is connected to the negative terminal of the battery directly, the second terminal is connected to the positive terminal of the battery via a current-limiting capacitor 5 and valve 12, and one third through the valve 13 is also connected to the positive terminal of the battery. The battery is charged by the current of two phases; 1-3 through valve 13 and 1-2 through venpai 12. Phase 2–3 current charges capacitor 5. In addition, a battery is charged to capacitor 5, when r; affffle terminals I and positive, and terminals 2 negative . In the next half-period of change of the phase 1-2 phase, the capacitor 5 transfers the accumulated by it to the battery, charging it. By changing the opening angle of the valves 12 and 13, it is possible to adjust the constant component of the asymmetric alternating current, which charges the battery. With fully open thyristors, this circuit is equivalent to the device according to the circuit of FIG. 4 and works in a similar way. Thus, the diagrams of the proposed devices with controlled and uncontrollable valves, better the load uniformity of the phases of a three-phase source and decrease the symmetry of the currents in the system, increase the energy performance of the system as a whole and provide its specific performance indicators. The invention The device for charging a battery is an asymmetric current containing a three-phase AC source, the first terminal of which is connected to the negative terminal of the battery, and the second and third are connected via a current-limiting capacitor and valve, respectively, to the positive terminal of the battery, characterized by In order to improve energy performance, it is equipped with an additional capacitor and two valves, for example thyristors, one of which is connected between the first source terminal the negative terminal of the battery and bypassed dopolt-gel capacitor, and the other - between the negative battery terminal and the second terminal nstochshzha. tfkff.l FIG. 2 F1lg 3 FIG.