SU419878A1 - PARAMETRIC VOLTAGE STABILIZER - Google Patents

Description

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A parametric voltage regulator is known, comprising a linear choke, a non-linear unit and a capacitor.

In order to reduce the weight, dimensions and losses in the proposed stabilizer, the nonlinear unit is made in the form of two anti-parallel thyristors, the control electrode of each one through which the diode in the opposite direction and the resistor are connected to its own cathode, and between the anodes of the diodes a saturated choke is connected.

FIG. 1 and 2 shows the scheme described stabilizer.

The stabilizer contains an unsaturated choke 1, having a low inductance and rated for a voltage of several percent of the nominal, and the total operating current, capacitor 2, thyristors 3 and 4, limiting resistors 5 and 6 in the peer control thyristors, diodes 7 and 8, saturating ferromagnetic element 9, designed for total voltage and low current, which controls the thyristors, and load 10.

When voltage is applied to the clamps 11 and 12 and the unsaturated ferromagnetic element 9 (see Fig. 1), the current in the series circuit is close to zero, and all the voltage is applied to the load 10. Under the action of this voltage, the core of the element 9 is re-magnetized. When the induction of saturation 5s is achieved, the inductive resistance of the element 9 decreases sharply, the control electrode of the thyristor 3 through the resistor B and the diode 7 receives a control signal and the thrust 3 opens. The current increases sharply, and an oscillatory process occurs in the power circuit, which ends over a period of time that is many times less than the period of the supply voltage. When the discharge current of the capacitor 2 becomes zero, the thyristor 3 is turned off. During the discharge, the induction of the ferromagnetic element 9 remains unchanged, and at the end of the discharge, the voltage on it changes sign and its core begins to

reversal in the opposite direction. Then the process is repeated with the difference that in the next half-period (with a different polarity of the applied voltage) the control signal through the resistor 5 and

the diode 8 goes to the thyristor 4. When the supply voltage changes, the saturation angle of the ferromagnetic element 9 changes so that the volt-second integral for this element remains unchanged, i.e. the average value of the voltage across the load does not change.

In the absence of saturation of the ferromagnetic element 9 (see Fig. 2), the current in the common circuit flows through the choke choke 13 and the capacitor 2, and the discharge current is closed not through the external circuit, but through the closed end

tour: capacitor 2 - unsaturated choke 1 - thyristor 3 or 4.

Subject invention

A parametric voltage regulator containing a linear choke, a non-linear unit and a capacitor, characterized in that, in order to reduce weight, dimensions and losses, the non-linear unit is made in the form of two anti-parallel-connected thyristors, the control electrode of each of which through a diode in the opposite direction, and the resistor is connected to its own cathode, and between the anodes of the diodes, a saturation-1, ij choke is connected.

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