SU915189A1 - Dc voltage-to-arbitrary shape voltage converter - Google Patents

Description

The invention relates to a converter technique and can be used to supply loads with a voltage of arbitrary shape. '

Known Converter DC voltage to alternating, in which the required form of the output voltage is approximated by a multi-stage signal ^].

Its disadvantage is that the power amplifier is controlled by bipolar pulses within one half-cycle of the output voltage, which complicates the device and makes it difficult to stabilize the shape of the output voltage.

The closest in technical terms to the proposed is a converter containing a block of controlled keys, an adder and a control node. The output voltage is formed by summing the unipolar pulses [2 ^] in each half-period.

2

However, it is characterized by insufficient stability of the form of output. th voltage. .

The purpose of the invention is to increase the stability of the shape of the output voltage ⁵ and to obtain a constant voltage at the output.

This is achieved in the proposed ,, inverter control unit is made as an amplitude ⁰ quantizing present comparator, a signal input of which is connected with the master oscillator, the output - a unit driven keys and input setting change of the comparator is connected to the feedback circuit

⁵ output converter.

In addition, the converter contains an additional power rectifier connected by an input to the output of the adder, with the feedback circuit connected to the output of the rectifier.

FIG. 1 shows the scheme of the proposed converter, single-phase version; in fig. 2 - the same, three-phase 915189

four

a variant; FIG. 3 ~ a diagram illustrating the operation of the converter.

The converter contains a master oscillator 1, a matching transformer 2, an amplitude quantizing comparator 3, a block of controlled keys 4, an adder 5. a feedback circuit 6 and 7 connected to the input 8 of a change in the setting of the comparator 3, an additional power rectifier 9, a power source 10 and a stabilizer voltage 11.

The device works as follows.

The input of the comparator from the master 5 generator 1 receives a low-power signal (Fig. 3), which should be reproduced at the output of the converter. In the three-phase variant (FIG. 2), the comparator of each phase 20 is given its own signal with a corresponding phase shift. At the outputs of the comparator (fig.Z) a pack of unipolar pulses is formed in each of the half-cycles of the input voltage, which 25 arrive at the block 4 of controlled keys and further on the adder 5 · The block 4 of keys and the adder 5 are the power amplifier.

Thus, at output 5, i.e. at the main output of the converter, the signal is the sum of the pulses of a packet and is shown in FIG. 3 in the form of a 1 ^ _m curve (for the single-phase circuit of FIG. 1). ₃₅

When the output voltage deviates from the specified form, which may be due to a change in the load supply voltage, etc., the feedback circuit 6 sends a signal to input 8 of the comparator 3 setpoint change, which leads to a change in the duration of the pulses generated at its output and to restore the desired forms.

power rectifier 9 (figure 2). The feedback circuit can be connected to the output of the rectifier 9 and divided into circuits 6 and 7, one of which

5 affects the setpoint of all levels of the comparator, except the top one, and the other affects only the setpoint of the upper level.

As a comparator, it is expedient to use a comparator according to auth.St. No. 372666.

Claims (2)

Claim 1. Constant voltage to arbitrary voltage converter containing interconnected block of controlled keys, adder and control unit, characterized in that, in order to increase the stability of the output voltage form, the control unit is designed as an amplitude quantum comparator, signal input which is connected with the master oscillator, the output is connected with the unit of controlled keys, and the input of the comparator setpoint change is connected through the feedback circuit with the output of the converter. 2. The converter according to claim 1, differing in the fact that in order to obtain a constant voltage at the output, an additional power rectifier is connected to it, connected by an input to the output of the adder, the feedback circuit being connected to the rectifier output.