SU1252874A1 - Device for controlling pulsed d.c.converter - Google Patents

Abstract

The invention relates to electrical engineering, namely to secondary power sources. The purpose of the invention is increased reliability. contains a driver thyme control thyristor 3 and a driver thyme generator 2, switching thyristor 4, switching capacitor 5, Introduction of current termination sensor 9 through discharge thyristor 4 eliminates the influence of interference caused by current pulses in the load, due to the fact that their switch-ons are separated in time and do not coincide with the work of power transformers. At the same time, the shaper units are simplified, since no additional solutions are needed to combat the interference. Sensor 9 is in the form of a pulse transformer. 3 il. with S g - FIG. 2

Description

The invention relates to a converter technique, namely to impulse converters for controlling the voltage of a dc consumer.

The aim of the invention is to increase the reliability of the control device by preventing the occurrence of voltage pauses at the output due to the prohibition of the inclusion of a discharge thyristor in case of untimely (false) switching of the charge thyristor on the interference from the main current during the switching of the thyristors.

Figure 1 shows the stress plots on the elements of the device; in flg.2, a block diagram of the control of the thyristors of the device together with a simplified power circuit of a dc voltage converter; figure 3 is a circuit diagram revealing

the content of all blocks of the pulse and control thyristor pulse control pulse drivers.

The device includes a primary (charge) thyristor control generator 1 and a driver 2 for controlling an auxiliary (discharge) thyristor. The thyristor impulse converter, for controlling which the device is used, contains charge thyristor 3, discharge thyristor 4, switching capacitor 5, diodes 6 and 7 at the output of which active-inductive load 8 is switched on, impulse current sensor 9 in the discharge thyristor circuit the first output of the former 1 is connected to the control electrode of the charge thyristor 3, and the second to its own switching off input, the input of the former 2 is connected to the switching capacitor 5, the output to the control electrode of the discharge About the thyristor 4, and the output of the pulse sensor for the termination of the discharge thyristor current is connected to the start input of the shaper 1.

I. ,

Shaper 1 (FIG. 3) includes

button 10, resistor II, capacitor 12, thyristors 13 and 14, diode 15, choke 16, variable resistor 17, storage capacitor 18, dynistor 19, pulse transformer 20, diodes 21 and 22.

five

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five

The driver includes a variable resistor 23, a storage capacitor 24, a dynistor 25, a pulse transformer 26, a diode 27.

The pulse sensor 9 for terminating the current of the discharge thyristor 4 contains a saturable transformer 28 and a diode 29. The trigger circuit consists of a capacitor 30, a resistor 31, and a button 32.

The device works as follows.

When the button 32 is pressed by the pulse formed on the output winding of the transformer 28, the thyristor 13 of the driver 1 is turned on, while the storage capacitor 18 starts to charge through the resistor 17. When the voltage across it reaches the threshold of the trigger of the dynistor 19, the latter breaks through, and the capacitor 18 is discharged to the pulse transformer 20 (Lig.12). Due to the oscillatory process, the dynistor is closed, and control pulses are generated on the secondary windings of the pulse transformer 20. One of them goes through the diode 22 to the control electrode of the thyristor 14, as a result of which the thyristor 13 is switched by oscillatory recharging of the capacitor 12 through the choke 16 and the driver 1 stops its operation. The second control pulse through the diode 21 is supplied to the charge thyristor 3 of the converter and the switching capacitor 5 begins to charge from the power source through the thyristor 3, the diode 7 and the load 8 with the polarity indicated in Fig. 3. The voltage across the capacitor 5 through the resistor 23 starts charging the booster capacitor 24 of the driver 2. When the voltage on it is equal to the response threshold of the dynistor 25, the latter breaks through and the capacitor 24 is discharged to the pulse transformer 26 (FIG. 1e). Due to the oscillatory process, the capacitor 24 and the capacitor 24 are closed, and a control pulse is generated on the output winding of the pulse transformer 26, which 5 through the diode 27 is fed to the control electrode of the discharge thyristor 4 of the pulse converter. Tiris- (torus 4 opens and commutes

0

five

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the capacitor 5 is charged to the load 8 through the diodes 6 and 7.

Diodes 6 and 7 perform in this scheme the function of zero diodes, and at the time of the end of charge (discharge) of the capacitor 5, the current in them is maintained due to the energy stored in the inductive load 8.

On the output winding of the transformer 28 of the pulse current sensor 9 at the time of the appearance of the current in the circuit of the thyristor 4 and at the time of its disappearance (i.e. at the time of changing the magnetic state of the transformer core), 5 polarity amplifiers, such as distributions, pulses, one of which (corresponding to the shutdown of the thyristor 4

Fig. IB) through the diode 29 enters the control electrode of the thyristor 3

Claims (1)

two-phase diodes, microcircuits and formula inventions A device for controlling the pulse DC / DC converter, which includes a charge and a row thyristor and a switching capacitor, which contains a charge control formers and a discharge thyristor, the last of which is connected by a switching capacitor, which is in order to increase the reliability of the current termination sensor through a different thyristor into it, connected to the start of the driver, the control of the charge thyristor pulses. shaper 1, after which the cycle of operation of the device is repeated. The converter can be turned off by pressing the 10 Stop button or by turning off the power voltage. The oscillograms of the output voltage of the converter and the voltage on the coccasing capacitor 5 are shown, respectively, in Fig. 1 (a, b). Thus, in the proposed device, the disturbances caused by current pulses in the load cannot in any way affect the operation both formers and determine the dips in the output voltage, since the moments of their work are separated in time and do not coincide with the work of power thyristors. This significantly increases the reliability of the control device. At the same time, the shaper blocks are simplified, since no additional solutions are required for the implementation of anti-interference and it becomes possible to use the control device of electronic devices with a high internal coefficient. gains, such as distancers, dual-base diodes, microcircuits, etc. Invention Formula A device for controlling a pulse DC / DC converter, including a charge and discharge thyristors and a switching capacitor, which contains control and driver thyristors for charging and discharge thyristors, the latter starting input of which is connected to a switching capacitor, characterized in that To increase reliability, a current termination sensor is introduced into it through a discharge thyristor connected to the trigger input of a thyristor control pulse generator. 1 J2l-if FIG. 3 Editor P.Kossey Compiled by E.Kalinkia Tehred, L, Serpukoya Proofreader M. Demchik Order 4628/54 Circulation 631 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab, 4/5 Production and printing company, Uzhgorod, Projecto st., 4