SU913350A1 - Device for control of regulating transistor of pulsed dc voltage regulators - Google Patents

Description

The invention relates to electrical power engineering and can be used when developing voltage-controlled secondary power sources.

The known device for controlling the regulating transistor of the DC voltage regulator (1].

The closest to the invention to the technical essence is a device containing a power source and a single vibrator connected to it with two switching transistors and a time-sensitive capacitor connected (directly or through corresponding diodes) to the base of one of these transistors and to the collector of the other of these transistors [2] .

A disadvantage of the known device is the need to use two sources of constant voltage. In the presence of a single source of DC voltage in the power supply system, to obtain a second source, it is necessary to use a DC / DC converter, which greatly complicates the device.

2

The purpose of the invention is the simplification of the control device of the regulating transistor of the DC voltage pulse regulators.

The goal is achieved by introducing three additional transistors into the device for controlling the control transistor of the pulse voltage regulators, the first of which is connected between the power supply bus and the time capacitor plate connected to the collector of the switching transistor of the single-transistor; the base of said first transistor to * and additionally via a decoupling diode connected in parallel to control the transition of the same commutation ^g ruyuschego transistor, and a third additional transistor connected in parallel with the control

_{m the} transition of another switching transistor.

The drawing shows a diagram representing

is an example of the device.

The device is made on the basis of a controlled odnnobrator n contains commute913350

transistors 1 and 2, shunt transistors 3 and 4, charging transistor 5, diodes 6, 7, decoupling diode 8 and auxiliary diodes 9-11, timing capacitor 12, auxiliary capacitor 13, resistors 14-17, voltage converter 18 , power source 19. The device output is connected to the regulating transistor switch 20, which is part of the DC voltage regulator (the regulator circuit is not shown in the drawing). Clock pulses are fed to the input 21 of the device.

The scheme works as follows.

Before the arrival of the synchronizing pulse, 5 at the input 21, the device is in a stable equilibrium state. The switching transistor 2 odnovnbratora open and saturated, as the base of this transistor through a resistor 15 and diode 6 from the power source 19 20

the unlocking current comes in, and the switching transistor 1 is closed, since the voltage at its base-batch junction is less than the unlocking threshold. Additional transistors 3 and 4 are closed, and therefore the first 25 charging transistor 5 is also closed. The presence of the cutting diode 8 prevents the base current of transistor 5 from flowing through the circuit 19-5-14-8-1-9-10-10-19. Diode 7 is also turned off, because its cathode is connected to the positive bus of power supply 19 via resistor 16 and base-emitter junction of transistor 20. Due to the absence of a charge circuit (transistor 5 is closed and diode 7 is turned off), the voltage on the capacitor 12 is approximately equals zero.

With the arrival of the clock pulse to the input 21 of the device, transistors 3 and 4 open and shunt the control transitions of the corresponding switching transistors 1 (through diodes 8-10) and 2 (through diode 11) which are closed. Since the base of the charging transistor 5 through the open transistor 3 and the resistor 14 from the source 19 of the power supply unlocking current, the transistor 5 is open. Due to the sufficiently large current of the additional transistor 5, the time-conducting capacitor 12 during the time of the short-duration clock pulse is charged to a voltage approximately equal to the voltage of source 19. This charge passes through the circuit: 19-5-12-6-4-19. The voltage on the auxiliary capacitor 13 is equal to the voltage on the open transistor 4.

After the end of the synchronizing pulse, the transistors 3 and 4 are closed and, therefore, the shunting of the control transitions of the transistors 1 and 2 is completed. Due to the presence of

auxiliary capacitor 13, the voltage at which the jump can not change, the transistor 2 is held in the closed state. The switching transistor 1 opens, as the voltage at its base-emitter junction becomes greater than the unlocking threshold. The device goes into a quasi-stable equilibrium state when transistor 1 is open, and transistor 2 is closed and the stage of holding the single-voltage device corresponding to this state begins.

At this stage, the discharge of the time-keeping capacitor 12 occurs along the circuits 19—15—12——7—1—9—10—19, which causes a decrease in the blocking voltage on diode 6. At the stage of exposure, the control transistor switch 20 of the DC voltage regulator is open and saturated .

When the voltage on the time-keeping capacitor 12 becomes close to zero, diode 6 opens, an unlocking current flows into the base of transistor 2 and the holding phase of the single-oscillator ends. The device again goes into a state of stable equilibrium when the switching transistor 1 is closed and the switching transistor 2 is open and saturated. In this state, the control transistor 20 is closed. When the next sync pulse appears, all the processes in the circuit are repeated.

Changing the duration of exposure of the one-shot, therefore, the duration of the on state of the regulating transistor 20 of the pulse regulator is carried out using a voltage-current converter 18. When increasing (decreasing) the voltage of the power source 19, the current through the resistor 17 connected to the right side of the capacitor 12 also increases (decreases). This increase (decrease) leads to acceleration (deceleration) of the discharge process of the capacitor 12, and thus to a decrease (increase) in the duration of the exposure of the one-shot.

Using a new set of attributes distinguishes the proposed apparatus ⁴⁵ controlling the control transistor pulsed DC voltage regulators from the known, since it is when the system has a single power supply voltage makes it possible to eliminate the necessity of application no ⁵⁰ inverter DC voltage constant. As a result, the device is greatly simplified and its weight and size characteristics are improved.

Claims (1)

Claim Device to control the regulator transistor pulse regulators constant 913350 four The power supply voltage contains a power source and a single-oscillator connected to it with two switching transistors and a time-dependent capacitor connected via a diode to the base of one of the switching transistors and to the collector of the other of these transistors, in order to simplify by eliminating the second power supply , three additional transistors are introduced into it, the first of which is connected between the power supply bus and the timing capacitor plate connected to the coy-, mutter collector guide monostable transistor, the second transistor via a further resistor connected to the base of said first transistor Tel'nykh refill · I through an isolation diode connected in parallel with the control 5 a transition of the same switching transistor, and a third additional transistor is connected in parallel to the control transition of another switching transistor.