SU474798A1 - Voltage Regulator - Google Patents

Description

3

12-15 is applied to the thyristor 16 and the control circuit consisting of a resistor 17, a capacitor 4 and a diisistor 18. The capacitor 4 is charged before the voltage of the probe of the distor 18 during one half period per V: rem determined by the resistance of the resistor 17 and the capacitance After the breakdown of the capacitor 18, the capacitor 4 is discharged through the control electrode circuit of the thyristor 16 II opens it. The charge time of the capacitor 4 to the nanstring of the dynstor 18 is set by changing the value of the variable resistor 17 and, therefore, it sets the moment of switching on the thyristor 16 during the current supply period; i.e., i.e., the average friction on the load 19 changes.

The elements that improve the characteristics of the voltage regulator and exclude the nonvoluntary thyristor of the thyristor 16 at the charge of the capacitor 4 to the voltage of the probing coaxial receiver 18 for a time longer than one half-cycle, in the case of the regulator in the area of controlling the output voltage, i.e. in case of large xs of the reistor 17, there is an electronic switch on the transistor 7, which discharges the capacitor 4 through the open collector-emitter junction of the transistor 7 and the limiting resistor 20 at the end and the beginning of each half period melting voltage when the thyristor 16 is closed.

To open the transistor 7, there is a control cascade on the transistor 5. The emitter target of transistor 5 includes a capacitor //, charged to a voltage determined by the capacitance of the switch 21, through a resistor 10 from a pulsing voltage 12-15 . The magnitude of the voltage on the capacitor 11 and the voltage on the base of the traazistor 5, given by the divider on the resistors 5 and I determine the sensitivity zone of the circuit. When the voltage decreases at the base of the transistor 5 at the end of each half-cycle below the voltage determined by the charge on the capacitor, transistor 5 opens. When opened and transistor 5, the capacitor 11 is discharged

through the transition collector-emitter of transistor 5 and the transition emitter - the base of transistor 7, opening the latter. The capacitor 4 is discharged through the open junction collector of transistor 7 and the resistor 20.

The use of such voltage regulators makes it possible to adjust the brightness of light sources, the heating wall of electric heaters, the rotation speed of variable-collector motors.

and direct current. Such voltage regulators can also be used for special transformerless power supplies. The losses on the adjustable elements are minimized and are determined by the losses on the semiconductor elements Irl of the passage of the direct current.

The subject is invented and

Claims (2)

1. A voltage regulator containing a thyristor included in a diagonal full-wave rectifier bridge, a thyristor control circuit with a dnistor and a timing circuit on a capacitor and a resistor connected to a bridge diagonal, characterized in that, in order to avoid output voltage jumps in the region of its small values, the regulator is supplied with a chain the discharge time of the master capacitor, consisting of a transistor wrench with a control loop, which ensures the discharge time of the master capacitor at the transition of the power supply to G1, is equal to and zero. 2. Voltage regulator according to claim 1, characterized in that the control loop contains a parallel string of a capacitor n a zener diode included in the emitter circuit. value of the transistor switch. R R one nineteen . AND