SU385362A1 - DEVICE FOR BATTERY CHARGE FROM HIGH-VOLTAGE SOURCE - Google Patents

Description

one

The invention relates to the field of electrical engineering, in particular with regard to the operation of batteries.

Devices for charging a battery from a high-voltage source are known, which contain series-connected thyristors shunted by a capacitor and a choke, and a transformer whose primary winding is connected to the battery circuit and the secondary is connected in parallel to this battery through a diode that passes a charge current pulse.

A significant disadvantage of these devices is the considerable size of the transformer due to the presence of a constant component of its primary winding.

The proposed device, in order to eliminate this drawback by reversal of the transformer core, is equipped with a choke connected to the secondary circuit of this transformer.

FIG. 1 is a schematic diagram of the device; in fig. Figure 2 shows the voltage curves C / 1 (a) on the primary winding of the transformer, the primary current ii (b), and the secondary current t2 (c) of the transformer, as well as the battery charge current 1b; in fig. Figure 3 shows a hysteresis loop over which a transformer alternately reversals when the device is operating.

The device consists of a high-voltage controlled self-switching valve key HC, formed from Ti-Hz thyristors connected in series, shunted by capacitor Sk and a non-linear low-voltage inductor, which can be single-winding or double-winding. The primary winding Wi of the transformer Tr is connected in series with the valve key HC, the second end

which is connected to the positive pole of the battery of the battery (with the polarity of the power source indicated in Fig. 1).

The negative pole of the battery is connected to the minus of the power source and through the linear choke of the LD to the end of the secondary winding Wz of the transformer. The beginning of the secondary winding Tr through diode D is connected to “plus AB, and, accordingly, to the end of the primary winding WiTp.

It is this kind of turning on the windings Wi and Wz of the transformer that allows to use both the primary current and the secondary current to charge the battery, and, due to the presence of LD, create demagnetizing ampere turns Tp during the pause (HC state on) due to accumulated in LD energy.

The operation of the device is carried out by applying control pulses to the high-voltage controlled valve switch of the shock wave.

Switching on the HC causes the voltage pulse Ui Ud-UQ to be applied in the primary winding Tp, equal to the voltage of the power supply source t / d and the voltage AB UQ. Due to the switching circuit consisting of a capacitor Ck and a nonlinear throttle ND after some time t turns on V B (Fig. 2). During the ON state, B, a current tl flows through Wi (Fig. 2.6), due to which emf is induced in the secondary winding, iz flows through (Fig. 2, c) and energy is stored in LD Wi .

By the time the HC is turned off in the LD is stored

„„ A (i, t, Y

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the switch yS is spent on maintaining the current iz- The current charges the battery and simultaneously demagnetizes Tr. It is obvious that the total charge current of the AB (Fig. 2, d) is the sumMu + i2. Since during the time (where T is the period of the control pulses), the current flows through the secondary winding Tp, then the magnetic the state of the core Tp (Fig. 3) from the point / in which it was located while the HC was turned on goes to point 3 or 4, and not to the point W, which would have occurred if there was no LD. Therefore, Tp is made without a gap and can even be made of a material with a rectangular hysteresis loop. In this case, its magnetization reversal occurs from –W to –i – Bn, that is, almost at the full peak.

Since in this case the inductive resistance of the perpendicular winding is insignificant, it is possible to slightly overshoot

direct voltage UCK on the capacitor Sk over the voltage of the direct current source t / d. The magnitude of the reverse voltage is determined by the ratio of the turns Wi Wz ND, and can be selected from the conditions of reliable switching of the shock wave.

It is obvious that the higher the frequency of HC opening, the greater the charge current of the battery. The termination of a battery charge is accomplished by decreasing the frequency of control pulses to zero. In case the frequency control is unacceptable or undesirable for any reason, the regulation of the charge current of the AB can be achieved by changing the duration of a packet of pulses of a constant frequency, taken as the optimal one.

The proposed device also works from the AC source. The operation occurs as described above in the moments of the positive half-waves of the sinusoid of the supply voltage.

Subject invention

A device for charging a battery from a high-voltage source, containing series-connected thyristors, shunted by a capacitor and a choke, and a transformer, the primary winding of which is connected to the battery circuit, and the secondary is connected in parallel to this battery through a diode that transmits a charge current pulse that differs so that, in order to reduce the size of the transformer, it is equipped with a choke included in the stump of the secondary winding of the transformer.