SU449343A1 - Key voltage regulator - Google Patents

Description

one

Key voltage regulators are known, comprising a winding of a power transformer with taps, a current transformer, control transistors and diodes.

However, the known stabilizers have low reliability and are distinguished by the lack of protection against overload and short circuit.

The purpose of the invention is to improve the reliability of the device, to protect the circuit from overloads and short circuits.

This goal is achieved by adding diodes, a resistor, a capacitor, a thyristor, a zener diode and an anode to the key voltage regulator. The diodes are connected to the bases of the control transistors, through an additional resistor - with the middle tap of the transformer winding, and through the secondary winding of the current transformer, diode and additional stabilizer Litron - with the manager

the emitter electrode, with the diodes between the bases of the control transistors and between the i taps of the winding, respectively, being connected counter-sequentially. The drawing is principled

electrical circuit of the proposed stabilizer.

When the positive polarity of the voltage at the terminals 1 and 2 of the windings of the transformer 3 through the circuit: Zener diode 4, load 5, transistor 6, current transformer 7 flows a power current. The transistor 6 is held in a saturated state by the current of the secondary winding 8 of the current transformer 7.

At the same time, the magnetization reversal of the core of the drossel 9 takes place, which is close to the output voltage.

After the core is saturated, a current pulse passes through the choke 9, which locks

and supporting transistor 6 until the end of the half period in the cut-off mode.

In the next half-period, the described processes are repeated with the Y transistor. During overloads or short-circuits of the scientific research institute, the voltage on the winding increases.

11, the thyristor 12 is turned on, and through the resistor 13 and the diodes 14, 15 it closes the transistor 6 in one period, and through the diodes 16, 17 - the transistor, 10 volts. another period. Diodes 15 and 17 are connected to transformer tap-offs for obtaining a positive blocking voltage at the bases of transistors 6 ,. 10 with no output voltage. The capacitor 18 and the resistor 19 provide current through the thyristor 12 and the moments of transition of the network voltage through zero and prevent it from turning off. The resistor 13 limits the current of the thyristor 12 when it is turned on. The diode 20 creates a positive bias on the control electrode of the thyristor 12, the stabilizer 21 determines the moment of the protection tripping.

To unlock the protection, it is sufficient to remove the supply voltage for the time of the discharge of the capacitor 18,

The subject is injected. and a Key Voltage Regulator containing a power transformer winding with taps, a current transformer regulating transistors and diodes, so that, in order to protect the device from overloads and short circuits and increase reliability diodes, resistors,

capacitor, - a zener diode, a thyristor, the anode of which is connected through additional diodes to the extreme ones, and through an additional capacitor to the middle leads of the power transformer winding, the cathode of the thyristor

through a resistor and diodes connected to the bases of the regulating transistors, through an additional resistor to the middle branch of the transformer winding, and through the secondary winding of the current transformer, diode and zener diode to the control electrode of the thyristor

regulatory transistor bases and between the winding taps, respectively, included

 counter-consistently.

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