SU1354362A1 - Rectifier control device - Google Patents

Abstract

The device for controlling the power supply unit of an electron-ion unit is in the field of electrical engineering. The aim of the invention is to increase the efficiency of the installation. The device contains a two-circuit structure. The internal circuit is designed to regulate the current, and the external circuit to regulate the voltage. The introduction of a filter, the output of which is connected to the input of the current regulator, and the input to the shunt, provides an increase in the average voltage across the load. 1 il..o

Description

The invention relates to the field of electrical engineering and can be used in converter equipment.

The purpose of the invention is to increase the power of the installation by increasing the average voltage.

The drawing shows a diagram of the device.

The power circuit of the installation is formed by a rectifier 1, connected to load 2 via shunt 3, a pair of rectifier 1 is connected to a divider 4, to the control input of rectifier 1 a pulse shaper 5 is connected, the input is connected to a zero-body 6. The latter has four the entrance.

The first input is connected to the voltage regulator 7, and the second to the generator 8 sawtooth voltage, the third to the selector 9 bits. Two filters 10 and 11 are connected to the opposite inputs of the adder 12, which is connected to the fourth input of the null organ 6. The circuit 13 of this connection can be switched on to the dead-sensitivity block 13 (diode).

The regulator 7 is made according to the type of low-pass filter and is connected to the input with a divider 4, and the inputs of filters 10 and 11 are connected to the outputs of the shunt 3. The device can also contain an additional filter connected to the output of the shunt 3. This filter is necessary to smooth the pulsations of the signal removed from Shunt 3. Second (filter may be absent if the pulsation from the output of the shunt is insignificant.

The device works as follows.

The transducer 1 supplies the load 2 with adjustable high (10-50 kV) voltage. The regulation of this voltage is made by changing the phase of the pulses. The regulation of the voltage at the output of the BET melter I is carried out by the voltage regulator 7, operating according to the principle of self-excitation, with positive feedback on the voltage.

The summation of the signals occurs at the inputs of the zero-organ 6. The zero-organ 6 compares the total DC voltage with the voltage of the generator 8, synchronized with the network,

At the moment of voltage equality, a control impulse is formed, which

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After amplification in the pulse shaper 5, it enters the input of the slider 1, the Phase of these pulses determines the values of the output voltage of the rectifier.

Filter 10 is executed with a minimum constant time, on the basis of good signal filtering (about 10–50 ms), and filter II in the positive circuit has a large time constant (about 0.5–2 s).

Load 2 is the installation of an electron-ion technology (ozonizer, electrostatic precipitator, installation for painting in an electrostatic field, etc.). Such an installation is subject to frequent breakdowns (spark and arc). During breakdowns, the selector of 9 bits prohibits the supply of pulses to rectifier 1 or sharply increases their phase. The voltage at the output of the rectifier 1 disappears, which contributes to the discharge of the discharge. When discharges, the voltage disappears, and hence the signal at the input of the voltage regulator 7.

Thus, after each bit, the process of self-excitation of the system begins anew. The duration of this process, even with a small inertia of the regulator 7 (tens of milli-seconds), lasts at least several periods of the network (5-20). As a result of a slow set of voltage, an undesirable loss of its medium occurs; its meaning. A boost voltage boost could be introduced, for example, using a differentiating circuit. But under the conditions of a variable output voltage level, the force is allowed only for 0.5-1 periods. Otherwise, it can lead to voltage overshoot and, therefore, to repeated breakdown.

In the proposed device, a forced increase in the voltage and current is achieved due to the fact that the filter 11 has the property of a zombie. Rectifier state that takes place before the breakdown.

During the time of the breakdown, this signal value at the output of the adder 12 decreases slightly (to the level of 70-90%). Therefore, despite the disappearance of the voltage at the output of the regulator 7, the setpoint signal is applied to the input of the zero organ 6 corresponding to the state of the rectifier below pre-breakdown.

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any R-C filter may be used in the circuit.

After reaching the corona discharge region, the self-excited regulator 7 has a signal higher than the signal of the adder 12, and the signal from the output of the adder 12 becomes equal to zero, since the static transfer coefficients of the filters 10 and 11 are the same.

Thus, the adder 12 as if remembers the state of the rectifier i (current or voltage) before the breakdown in the load and after its termination sets the value slightly less.

The circuit may use a dead block. The appointment of his next. In the steady state without breakdown, the output signal of the adder 12 must be zero. However, due to inaccuracies (technological, temperature drift), the parameters of filters 10 and 11 are 30

is violated. This small error is 25 in that it is removed by the insensitivity unit 13 - a diode (one or two anti-parallel, or one-or two zener diodes with two consecutive J.

The filter 10 with a small time constant may be absent if the adder 2 is inertial.

Thus, the device provides a high response rate of voltage, which increases the average voltage on the load to increase the output voltage of the rectifier during short-term load breaks, it is equipped with an adder with antiphase inputs and two filters with different constants of time, the zero-organ is equipped the fourth input, the output of the current sensor is connected to the filter inputs, the outputs of which are connected to the anti-phase inputs of the adder, the output of which is connected to the fourth input of the zero-organ.

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ke. This in turn leads to an increase in the efficiency of the entire installation of electron-ion technology.

Fore, Mula Invention

The dp control unit of the rectifier, containing a pulse shaper, the output of which is intended to be connected to the rectifier input, and the input is connected to the output of the zero organ, the first input of which is connected to the output of the voltage regulator,

second input - to the generator output

A sawtooth voltage synchronized with the mains, the voltage output of the voltage sensor is connected to the third input of the zero-organ, the voltage sensor input is intended to be connected to the output of the rectifier, the current sensor whose input is intended to be connected to the power circuit of the rectifier ,

characterized in that

The aim of increasing the output voltage of the rectifier during short-term load breakdowns is that it is equipped with an anti-phase adder and two filters with different time constants, the zero-organ is equipped with a fourth input, and the output of the current sensor is connected to the filter inputs. phase inputs of the adder, the output of which is connected to the fourth input of the zero-body.

Compiled by S.Luzanov Editor L.Zaitseva Tehred I.Popovich Proofreader G.Reshetnik

Order 5710/52 Circulation 659 Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Production and printing company, Uzhgorod, st. Project, 4

Claims (1)

Claim A device for controlling the body rectifiers, containing a pulse shaper, 10 whose output is intended to be connected to the input of the rectifier, and the input is connected to the output of a zero-organ, the first input of which is connected to the output of the voltage regulator, 15 the second input to the output of the sawtooth generator, synchronized with mains supply, the output of the voltage sensor through the sensor of breakdowns of the load is connected to the third input It is designed to be included in the rectifier power circuit, 25 characterized in that, in order to increase the output voltage of the rectifier during short-term load breakdowns, it is equipped with an adder with antiphase inputs and 30 two filters with different time constants, a zero-organ is equipped with a fourth input, and the output the current sensor is connected to the inputs of the filters, the outputs of which are connected to the antiphase inputs of the adder, the output of which is connected to the fourth input of the zero-organ. average load voltage