SU1206939A1 - Device for charging capacitance integrator - Google Patents

Description

The invention relates to electrical engineering and is intended to supply pulsed loads, in particular capacitive energy stores,

The circuit of the invention is a reduction in power consumption.

Figure 1 is a schematic diagram of the device; FIG. 2 shows timing diagrams explaining his work.

The device contains pins 1 for connecting an AC power source, a key element made of opposite thyristors 2 and 3, a capacitor 4 connected in parallel to the primary winding of the transformer 5, Blender1, capacitive drive 7 and feedback loop 8, providing stabilization natr - married accumulator 7.

The operation of the device is as follows.

Let the key element turn on at the time t " O (FIG. 2) and the capacitive drive 7 begins to charge. Suppose that at the moment of switching on the residual induction in the core of the transformer is zero, and the voltage of the power source passes through its maximum value. In this case, the induction in the core varies sinusoidally (Fig. 2, b). By the time t, the voltage on the capacitive head reaches the nominal value, the transformer switches to idle mode, and at the time t the key element disconnects the primary winding of the transformer from the network. . In figure 2, b the moment t ,, corresponds to the passage of induction B through the maximum value. In this case, the voltage on the capacitor 4 is zero. Due to the energy of the magnetic field (in magnetizing inductance LJ, capacitor 4 is charged and then discharged to the primary winding of transformer 5. In the circuit formed by capacitor 4 and primary winding, damped oscillations occur and the residual induction in the transformer core decreases to almost zero At the time tj, the discharge of the capacitive accumulator 7 begins, and after the end of the discharge at the moment t the key element is switched on again. The new cycle of the charge of the capacitive accumulator is found. Figure 2b shows the most unfavorable When pleasing case where vklk chenie occurs at the beginning of the half-wave voltage mains. Dotted lines indicate duress, and free PR Btg moieties E induction.

in general, energy is stored

and in the inductance Lj "and in the capacitor 4, but in any case, in the circuit of the capacitor 4 and the primary winding of the transformer arise

damped oscillations and the residual induction in the core of the transformer decreases to zero, which reduces the magnitude of the inrush current during the next turn

transformer.

The frequency of damped oscillations and their duration are determined by the capacitance value of the capacitor 4 and the parameters of the magnetization branch

transformers (. and). It is advisable to take the capacitance value from the conditions of excitation in the oscillation circuit with the frequency of the supply network, frequency f "50 1

for example, at C 1314 X

uf

R

which increases the power factor of the installation. After the transformer is disconnected due to losses in the steel, the oscillations subside in one to two periods. It is also possible to reduce the capacitance of capacitor 4 by two to three times or more, which increases the oscillation frequency and shortens their duration, for example, in view of reducing the inrush of capacitive switching currents. However, it is better to limit the surge resistance of a small value, within a few percent of the capacitance, which is practically

will not lead to a deterioration of the efficiency of the device. In high-power installations, it is advisable to connect in series with an inductor (reactor) capacitor,

It does not matter for the device, in parallel with which a capacitor is switched on from the windings - primary or secondary.

It is also possible to connect; Two capacitors: both to the primary and to the secondary windings of the transformer. A variant with connecting a capacitor parallel to the secondary winding may in some cases be

G uj

1206939

more preferable, since it allows a slight reduction in the inrush current of the turn-on of the condensate switch, due to the inductive resistance of the recess of the transformer primary winding.

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Phi1.2

Editor N.Pushnenkova

8732/58 Circulation 5 Subscription

BNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Branch ShSh Patent, Uzhgorod, st. Project, 4

Compiled by E.Melnikova

Tehred M. Nador Corrector V. But ha

Claims (3)

1.' DEVICE FOR CHARGING A CAPACITIVE STORAGE, containing a transformer, the primary winding of which through the key element forms the input terminals, and the second through the rectifier is connected to the capacitive storage, and a feedback circuit connected to one of the terminals of the capacitive storage and the output to the control input a key element, characterized in that, in order to reduce power consumption, a capacitor is connected in parallel to one of the transformer windings. 2. The device according to claim 1, characterized in that a resistor is connected in series with the capacitor. 3. The device according to claim 1, characterized in that the reactor is connected in series with the capacitor.