SU487383A1 - Voltage stabilizer - Google Patents

Description

one

This invention relates to the field of secondary power sources.

A device is known that contains a voltage converter, an auxiliary rectifier, a regulating element made according to a composite transistor, and a key stabilizer.

A disadvantage of the known device lies in the VOLUME THAT, when used as an emission suppressor for the voltage of the nervous network, a significant POWER is dispersed on the regulating element of the key stabilizer.

The purpose of the invention is to increase the efficiency by reducing the power dissipated on the regulating element of the key stabilizer. This is achieved by introducing a comparator on the transistor, which ensures full unlocking of the regulating transistor of the key voltage regulator at a voltage of the primary network not exceeding the set maximum value.

FIG. 1 shows a diagram of the proposed device; in fig. 2 a, b, c, d, e, f, g are voltage diagrams on stabilizer elements.

The voltage stabilizer contains an auxiliary stabilized source 1, a pulse-width modulator 2, a control transistor 3, a full-wave rectifier 4, a variable-duration pulse generator 5, a blocking generator 6, a comparator made on transistor 7.

The voltage regulator operates as follows.

If the voltage of the primary source does not exceed the emergency level, a rectangular shape is formed on the output winding of the variable-voltage pulse generator 5

voltage (Fig. 2a). This arrangement is rectified by the full-wave rectifier 4, and at the transition emitter-base of the regulating transistor 3, the voltage has the form shown in fig. 2 b. The regulating transistor 3 is introduced into saturation and during the action of the back and front edges of the pulse voltage of the emission suppressor in this case is equal to the input one minus the voltage drop across the regulating

transistor.

If the voltage of the primary source exceeds the alarm level, then a voltage is generated at the output winding of a pulse-width generator of varying duration.

"Pads at zero (Fig. 2c), and at the non-junction emitter-base of the regulating transistor after full-wave straightening, positive impulses are formed, the duration of which varies according to the change in the direction of the primary source

nickname (Fig. 2 g). In this case, the emission suppressor acts as a key stabilizer and the voltage at its output does not exceed a given level.

Until the primary source exceeds the emergency level, the pulse-width modulator is not controlled, but generates pulses (Fig. 2e), which in duration make up an insignificant part of the period to a non-temporal generator of pulses, modulating its output voltage (Fig. 2e). This increases the level of the transition voltage emitter-base of its transistor (Fig. 2 g), increasing losses on it. In order to avoid them, the width of the imi mual modulator is switched on only from the moment the voltage at the output of the noise suppressor reaches a predetermined level.

This happens as follows. If the voltage at the output of the surge suppressor does not exceed the alarm level, transistor 7 is closed. The pulses of the blocking generator do not pass through it to the input of a pulse-width modulator. When the output voltage reaches the required level at the output of the voltage suppressor, transistor 7 opens and sends the impulses to the input of the pulse-width modulator.

After starting, the pulse-width modulator, made on the basis of a standby multivibrator, affects the duration of positive pulses arriving at the emitter-base transition of the regulating transistor of the key stabilizer, stabilizing the output emission suppressor.

four

In order to protect the elements of the control circuit from emergency overvoltages of the primary source, the supply voltage to them is supplied through a continuous regulator. The stabilizer starts to operate in the stabilization mode from the moment it reaches the primary source of emergency voltage. Until then, the regulating transistor of the continuous regulator stabilizer, en. This use of a continuous regulator additionally increases the efficiency of the entire device.

Subject invention

A voltage regulator, a control transistor operating in a key mode, which is connected via a two-period rectifier to the output of a variable-duration pulse generator connected to a transmitter-pulse modulator, a blocking generator and an output of the device, and an auxiliary stabilized power source connected to the circuit m of power supply of said generators and a pulse-width modulator, characterized in that, in order to increase the c. d., it is equipped with a comparator, the input of which is connected to the output output divider, and the output through the diffusion circuit and the diode is connected to the input of the pulse-width modulator, and the output winding of the blocking generator transformer through the diode and

A resistor is connected between the emitter and the base of the comparator transistor.

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