SU577609A1 - Device for charging storage battery with asymmetric current - Google Patents

Description

(54) DEVICE FOR CHARGING BATTERY ACCUMULATOR ASYMMETRIC CURRENT

Thus, these charging devices have a comparatively complex pattern of forming an asymmetric current, and due to the fact that the energy of the discharge pulses is approximately 15-40% of the energy of the charging pulses, the charge of batteries using such devices is relatively low efficiency.

The aim of the invention is to simplify the device and increase efficiency.

For this purpose, an electrical discharge capacitor is made in the form of two capacitors, connected to the two opposite shoulders of a bridge rectifier, the other two arms of which form thyristors, and the terminals of the input diagonal are connected to the secondary windings of the specified transformer.

FIG. 1 is given the electrical circuit of the proposed device; figure 2 and 3 - the same options.

In the battery device, battery 1 is connected to the output terminals of a bridge controlled rectifier 2, to terminals 3, 4 of the input diagonal of which are connected three-phase AC source windings 5. Two two opposite arms of the bridge 2 include capacitors 6, 7, and the other two his shoulders are formed by thyristors 8 and 9, the opening signals of which are supplied from unit 10, which monitors the voltage of the battery and the source and the phase control of the thyristors.

When considering the processes in the device, we assume that its thyristors 8 and 9 are completely open in the corresponding half-periods, i.e. current is conducted as normal diodes.

Considering that the battery voltage is less than the amplitude value of the source EMF, consider the operation of the device rectifier.

In the half-period of the instantaneous value of the EMF of source 5, (which will be considered odd), when the voltage of terminal 3 is positive, terminal 4 is negative, and the source voltage exceeds the battery voltage, it is charged along the circuit: terminal valve 8, battery 1, thyristor 9 / terminal 4. The capacitors b and 7, which are connected to the charge circuit, are charged respectively through the open thyristors 8 and 9 before the voltage of the battery and accumulate the source energy.

The battery’s charge on the circuit under consideration continues until the source voltage, the age in absolute value and then decrease, becomes equal to the battery voltage. Thyristors 8 and 9 at the same time cease to conduct the source current and their resistance increases infinitely. At this time, parallel to the battery, there is a switched on circuit of three sources connected in series: cond. Generator 6, source 5 and condensate 11a 7 whose voltage is equal to each other. The total voltage of the circuit under consideration is equal to the battery voltage, since the polarity of the source voltage is inverse to the polarity of the co-sensor.

As the source emf decreases, the total voltage of the circuit under consideration increases and therefore the capacitors, having discharged, give the battery the energy previously stored by them from the source. At the point in time when the source voltage becomes zero, the capacitors are discharged to a voltage that is half the voltage of the battery.

In the next (even) half-period of the emf of the source, when the terminal 4 is positive, and the terminal 3 is negative, the polarity of the capacitors and the source turns on and the capacitors continue to discharge to the battery until the instantaneous value of the source voltage equal to the voltage of the battery. After this, the polarity of the voltage of the capacitors changes as they recharge at this time. The battery charge continues until the source voltage reaches its maximum value. At this time, the charging current pulse of the battery stops. The voltage of the capacitors connected in series at this time is equal to the difference of the amplitude value of the voltage of the source and the battery.

At the moment when the instantaneous value of the voltage of the source decreases, the battery starts charging through the source 5 to the capacitors B and 7, which are recharged again. The charging pulse lasts until the source voltage becomes zero. At this time, the voltage of each capacitor is equal to half the battery voltage.

With a change in the polarity of the source voltage in the next odd half-period, the sub-discharge pulse of the battery lasts until the source voltage equals the voltage of the battery. At this time, the sub-discharge pulse stops, and if the valves 8 and 9 are open, the source charges the battery and charges the capacitors in the same way as in the case discussed above.

If the thyristors are closed, the source current to the battery through the valves does not leak. Changing the opening time of the thyristors, you can adjust the average value