SU788298A1 - High-voltage ripple filter - Google Patents

Description

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The invention relates to electrical engineering and can be used in high-voltage devices for various purposes, in particular in high-voltage power sources intended for physical research.

Filters are known for smoothing pulsations of rectified voltage, containing an actuator connected between the same input and output terminals, and amplifier fl.

The disadvantage of such devices is significant power loss in the executive body. In addition, the input voltage ripple in such devices should not exceed the maximum allowable junction voltage of the collector-emitter of the transistor of the actuator, which significantly reduces their scope, in particular, does not allow them to be used in high-voltage installations with high pulsation.

Also known is an active capacitive filter, the active capacitive filter circuit of which is designed to control the DC voltage in the power supply systems, includes

an amplifier controlling the output transistor stage 2.

However, the known filter has a relatively low allowable range of input voltage ripple.

Closest to the proposed technical entity is a device containing a transistor, through the power transition of which the like input and output terminals are connected to each other, and the other two, outputs are connected directly; and a divider on resistors. Parallel

15 the collector-base of the transistor included a chain of series-connected zener diode and throttle L3j.

However, this device is characterized by these disadvantages.

20 The purpose of the invention is to expand the allowable range of the ripple value of the input voltage.

The goal is achieved by the fact that in the high-voltage drift)

25 filter containing the executive body, performed on the transistor, the power transition which is included between the input and output terminals of the same name, and its collector-base

Claims (3)

30 the transition is shunted by a chain of series-connected stabilizers and throttles, a resistive divider of output voltages and an amplifier connected to it, its executive body is made of N series-connected similar transistor circuits, and a Roger generator is inserted into it, the input terminals of which are connected to the output of the mentioned amplifier , and having at the output N rectifiers, which through the additionally introduced coupling capacitors are connected to the control transitions of the actuators of the executive organ. A typical electrical circuit diagram of the device is shown in the drawing. The filter contains an actuator 1, made on N series-connected transistors 2, a collector-base junction of which is shunted by a series of Zener diode 3 and droplets 4, a voltage divider on resistors 5 and 6, an amplifier 7 connected to it, and Royer’s generator 8 with N output windings 9 and N output rectifiers 10, which are connected via dividing capacitor 11 to the control transitions of the actuators of the executive organ. The device works as follows. The operating mode of the transistor 2 of the executive organ 1 with direct current is set by chains of series-connected zener diodes 3 and chokes 4. In this case, the constant component voltage on the executive organ is defined as follows: -N and UcT. n. where N is the number of series-connected transistors of the executive body; Uj, .t, is the stabilization voltage of the zener diodes 3. A part of the filter output signal, removed from the resistor 5 of the voltage divider, is amplified by the amplifier 7 and is fed to the power buses of the 8Roore generator, generating square-shaped pulses with a frequency determined by the Kotelnikov theorem taking into account obtaining the required quality of the output voltage. Since the output voltage of the amplifier, and hence the voltage of the generator, is modulated by the ripple of the output voltage of the filter, the output voltage of the secondary windings 9 is also modulated, with the envelope repeating the shape of the pulsations. The voltage of the windings 9 is generated by rectifiers, 10 and across the separation capacitors 11 I apply to the basic transitions of the transistors of the actuator. The voltages 10 and the capacitors 11 produce an envelope from the output signal of the windings 9. Thus, the ripple of the output voltage of the filter is almost completely allocated to the transistor of the actuator. In the known device, the maximum permissible ripple of the input voltage is determined as follows: riax and where is the maximum permissible transition voltage of the collector-emitter of the transistor of the executive body; K 1 is the safety factor for voltage. The maximum allowable range of input voltage ripples in the proposed device is UM S nTi, - where K, - is the safety factor, taking into account the spread of the gain factors of the transistors. Thus, with IT, 1, moil e-1 to-Ea. - k.-e-b in the proposed input voltage ripple device can be up to one-fold higher than the known one, which allows using the proposed filter in power supplies of electronic-ion technology devices, in particular in cascade generators, where the voltage ripple reaches several kilovolts. Claims of the Invention A high-voltage dust-closure filter containing an executive element made on a transistor, the power transition of which includes the melody with the same input and output terminals, and its collector-base junction is shunted by a chain of series-connected zener diodes and droplets, and a resistive output voltage divider and connected to it. amplifier, which is determined by the fact that, in order to expand the permissible range of the ripple value of the input voltage, its executive body is made of N pos Similar transistor circuits are connected and a Roeper generator is inserted into it, the input pins connected to the output of the mentioned amplifier, and having N rectifiers at the output, which are connected to control transitions of the executive organ transistors through dividing capacitors. Sources of information taken into account in the examination 1. The author's certificate of the USSR 495748, cl. H 02 M 1/14, 1976. 2. The patent of the USA 3670220, cl. NOM 1/14, 1970. 3. Authors certificate of the USSR 607310, cl. H 2 M 1/14, 1977. D L (y