SU472339A1 - Pulse AC Voltage Stabilizer - Google Patents

Description

one

The invention relates to the field of electrical engineering, in particular, to devices for the threading of electronic equipment.

Pulse AC voltage regulators are known, which include a booster transformer, a key regulating element, a control, an output filter, and a source of on-voltage.

A disadvantage of the known stabilizers is a significant distortion of the shape of the output voltage, especially with increasing input voltage. In addition, the dynamic properties of such stabilizers are not high enough due to the long duration of the booster pulse.

The aim of the invention is to eliminate the above disadvantages. To do this, one of the inputs of the output filter, completed by the integrating circuit, is connected directly to the network, and the other, via a key regulating element, is connected to the output of a booster transformer, and a sinusoidal voltage generator, amplified in frequency, is used as a source of reference voltage equal to the frequency of the network.

FIG. 1 shows the scheme of the proposed stabilizer; in fig. 2 - stress diagrams.

The device consists of a booster transformer 1, a key regulating element 2, a pulse-width modulator 3, a synchronization circuit 4, a voltage regulator 5, a comparison circuit 6, an alternating generator 7, an integral filter 8, a load 9.

The principle of operation of the proposed stabilizer is as follows.

The frequency of operation of the key regulating element 2 is chosen much higher than the frequency of the supply network, and at the input of the integral filter 8 there are rectangular pulses, the envelope of which is a sinusoid, whose frequency is equal to the frequency of the supply network. At the time of the open state of the key regulating element, the capacitor and the choke of the integral filter accumulate electrical energy. When the key regulating element is closed, the synchronization circuit 4 opens one of the switching thyristors and the choke of the integral filter is discharged to the load. Consequently, at the moment of pause, the voltage on the load 9 is maintained by the energy stored in the capacitor and the choke of the integral filter. By adjusting the duty cycle of the impuls, you can adjust the size of the output pattern. Let's say a form

network voltage for some reason is distorted. The same distorted form will be applied to the load. Since the comparison circuit as a voltage reference from the alternating sinusoidal stable voltage generator 7 receives a highly stable in amplitude and shape alternating voltage strictly synchronized with the network frequency, the comparison circuit will produce an error signal that is applied to the pulse-width module torus and changes the duration of the key regulatory element.

FIG. Figure 2 shows the voltage plots of L, Uon, and C / heating, as well as the current / switch in the regulating element.

At section ab (Fig. 2), the pulse-width modulator will increase the duration of current pulses and shorten the pause time. On the section b-d, on the contrary, the duration of the pulses will decrease, and the duration of the pause will increase. At the same time, the voltage at the load will drop slightly.

Thus, to achieve correction of the output voltage form with a distorted input. At the same time, voltage is stabilized at a mean value. The booster transformer 1 is required to compensate for the decrease in input voltage due to its discrete transfer to the load.

Subject invention

An impulse-impulse stabilizer that contains a booster transformer, a key regulating element, a control, an output filter, and an on-voltage source, characterized in that one of the inputs of the stabilizer and correcting the shape of the output voltage upon distortion of the input voltage the filter, which was made but the integrating circuit, is connected directly to the network, and the other, through a key regulating element, to the output of the booster transformer, and in A generator of sinusoidal voltage, stabilized with amplitude, with a frequency equal to the frequency of the network, was used as a source of reference voltage.

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