SU684525A1 - Ac voltage stabilizer - Google Patents

Description

(54) AC VOLTAGE STABILIZER

I

. The invention relates to electrical engineering and can be used in the power supply circuits of various radio engineering equipment.

The AC voltage regulator is known, which contains a transformer with one primary winding, in series with which a rectifying bridge with a transistor in the diagonal and several secondary windings is connected, each of which is connected to the load through a straightening device, a zener diode and a resistor i,

Most technical aspects of the proposed invention are a stabilizer comprising a power transformer, the primary winding of which is connected to the input terminals and is made in the form of two sections, between which a main rectifier with a regulating element, an auxiliary rectifier connected by

to the input terminals, and the output through the Zener diode to the control input of the reguishing element, to which also connect the first output of the resistor 2}.

A disadvantage of the known devices is that a diode rectifying bridge is used to obtain the base current of the regulating element and the stabilization current of the Zener diode, which increases the number of semiconductor diodes in these stabilizers.

The purpose of the invention is to simplify the electric circuit of the Stabilizer.

This goal is achieved by the fact that in a known AC voltage regulator an auxiliary voltage, the rectifier is made two-way / Echev, and the second output of the resistor is connected to the positive output of the main terminal.

Claims (1)

The invention is illustrated in drawing where on. Figure 1 shows the electrical circuit of the AC voltage regulator; in fig. 2 change the shape of the output voltage depending on the amplitude of the input voltage. The AC voltage regulator contains a power transformer 1, in which the primary winding is made in two sections 2 and 3, between which the main converter is connected, diode 4-7, with regulator element 8, a two-arm auxiliary rectifier assembled on diodes 9 and 10 and connected to the input terminals, zener diode 11 and reoistor 12, connected in series and connected by a common point to the regulating element 8, where the second output of the resistor is connected to the positive output, rectified, and the anode is stabilized Throne 11 is connected to the point of the necks 10 of the anodes 9 and auxiliary rectifier. The stabilizer voltage AC operates as follows. , When applied to the input of the mains voltage regulator, the output voltage is alternating at its output. If the half-wave is positive, the current 1-sh on section 2 of the primary winding of transformer 1 will flow through diode 6 above the capacitor, the collector emitter of the regulating transistor 8, diode 5 above the capacitor and section 3. When, as the network voltage increases, the voltage on the zener diode 11 reaches the stabilization value, it ignites. The current circuit for Zener diode 11 in this case will be: section 2, diode 6 straightened, h, resistor 12, stabilizer 11, diode 10, input imebfMa, According to the second Kirchhoff law for closed circuit: diode 1O, zener diode 11 , the base-emitter junction of the transistor 8, the diode S of section 3 has the form E ,. where e. tighter stabilization of the Zener diode 11; y is the voltage at the emitter base of the control transistor 8; Ug is the voltage drop on the direct resistance of diode 5; y is the voltage across section 3; y is the voltage across the direct resistance of the 1O diode. From the above expression can be seen. that the voltage across seshga 3 of the primary winding of transformer 1 cannot be greater than the value determined by the voltage stabilizing zener diode 11 (if we ignore the small voltage drop at the emitter junction of the control transistor and the direct resistance of the diodes). Thus, a further increase in the mains voltage will cause only an increase in the voltage drop across the regulating transistor 8, and the voltage on e7 {transformer primary winding e will not change. The voltage on section 2 will be slightly higher than on section 3, since the currents flowing through them are equal to the current value of the stabilizer 11, when the polarity of the voltage on the input terminals is changed the same as for the closed circuit: diode 9 auxiliary rectifier , zener diode 11, base-emitter junction of transistor 8, diode 7 supra miter, section 2 Hivieer type: Therefore, in each half-period of the supply voltage, the voltage on the section connected in series by the emitter of the regulating transistor 8 is limited by the voltage zener diodes 11. The distribution of currents in the sections of the primary winding changes mutually. The sum of the voltages in sections 2 and 3 remains constant, and the effect of the voltage on the secondary winding of the transformer. 1 will be stable. The use of a two-arm auxiliary voltage in an AC voltage regulator to create a stabilizer current, and connecting a resistor to one of the rectifier's terminals significantly simplifies the stabilizer circuitry by reducing the number of elements and increasing its reliability. Claims An alternating current voltage regulator containing a power transformer, the primary winding of which is connected to the INPUT terminals and executed in two sections, between which the main terminal with the regulating element, the auxiliary terminal connected by the input to the input terminals, and the output through the zener diode to the control input of the regulating element, to which the first output of the resistor is also connected, in which, for the sake of simplicity, the auxiliary rectifier is completed in it chevy, and the second output of the resistor is connected