RU1802396C - High-voltage d c amplifier - Google Patents

Abstract

The invention relates to radio engineering and can be used as a high-voltage amplifier for controlling electro-optical modulators, as well as piezoceramic devices in systems of step-wise scanning or scanning with optical beams. The purpose of the invention is to increase the linearity of the characteristic. Depending on the ratio of the signals at the input of the low-voltage operational amplifier 1, UBX and Uoc a signal appears at one of the outputs of the paraphase cascade 2. If UBX Uoc, then a controlled blocking generator 31 is started, with pulses through an isolation transformer 41, the key transistor 52 is opened. The load capacity b is charged. The load capacity 6 is discharged similarly at Uex Uoc by starting the controlled blocking generator 32. The capacity discharge and charge takes place until UBx U0c. 1 ill.

Description

The invention relates to radio engineering And can be used as a high-voltage amplifier for controlling electro-optical modulators, as well as xj: e devices made of piezoceramics in a NJax system of step scan or Qi scanning with optical beams. } The object of the invention is to increase the linearity of the characteristics of a high-voltage | DC amplifier.

The drawing shows the structural diagram | e of the proposed device and the following notation: 1-low voltage

operational amplifier; 2 - paraphase cascade; 31, 32 - the first and second frequency-controlled blocking generators; 41, 42

- {first and second decoupling transformers; 5 - key cascade; 51. 53 - blank resistors of the upper and lower shoulders; 52, 54 - high-voltage transistors of the upper and lower arms; 6 - load capacity; 71, 72 - the first and second windings.

The output of the low-voltage operational amplifier 1 is connected to the input of the paraphase cascade 2, the upper and lower arms of which are connected to the inputs of the same type of cascades, each of which contains blocking generators 31, 32 and decoupling transformers 41, 42 connected in series, the outputs of which are connected to the inputs of the upper and lower shoulders of the key cascade. The latter comprises suppressor resistors 51, 53 and high voltage transistors connected in series in the upper and lower arms. 52, 54. In this case, the bases of the transistors 58, 54 are the inputs of the key stage, the second output of the damping resistor of the upper arm 51 is connected to the bus of the high voltage power supply, and the emitter of the last high voltage transistor of the lower arm is connected to the common bus, the output of the key stage 5 is connected with a load capacity of 6 and a second opera input (L

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amplifier 1. The first input of operational amplifier 1 is the input of a high voltage amplifier. The additionally introduced windings 71, 72 are electrically connected in series with the quenching resistors 51, 53 of the key stage 5 and are inductively connected to their decoupling transformers 41, 42. The findings of the windings are connected in such a way that in. Inductive negative feedback circuits are formed on each arm of the high voltage amplifier.

The amplifier operates as follows.

Depending on the ratio of the signals at the input of the operational amplifier 1 DBX

AND DOC (Uoc; Uax Uoc) APPEAR 6 SIGNAL

at one of the outputs of the paraphase cascade 2 (U0c KUoc, K is the division ratio of the input divider of the operational amplifier). If Unx 0oc, then the controlled blocking generator 31 is started, the pulses of which through the isolation transformer 41 open the high-voltage switch 52. The load capacitance is charged. The discharge of the load capacitance is carried out similarly with UBX Uoc by starting the blocking generator 32. The discharge and charge of the capacitance occurs until UBX U0c. The pulse repetition rate of the burst generated by the blocking generators is proportional to the difference I UBX - Uoc I. The pulse duration depends on the difference (Un Uc) when the load capacitance is charged and on the value of the voltage Uc when it is discharged.

Unlike protrtype and analogs, the amplifier provides operation with increased linearity of characteristics.

Claims (1)

SUMMARY OF THE INVENTION A high-voltage DC amplifier, comprising a series-connected low-voltage operational amplifier, one input of which is an input of an amplifier, a paraphase cascade, the first output of which is connected to the input of a first controlled blocking generator having a first isolation transformer at the output, and the second output with the input of the second controlled blocking generator having a second decoupling transformer at the output, as well as an output push-pull key stage containing the first and second damping resistors and DC-connected in series, the first, second, third and fourth transistors, while the first output of the first damping resistor is connected to the corresponding high-voltage supply bus, the first and second transistors are connected between the base and emitter of the first and second transistors the secondary windings of the first decoupling transformer, respectively, the emitter of the second transistor, is connected to the other input of the low-voltage operational amplifier, and to the first output of the second damping resistor, while their connection point is connected to corresponding capacitor terminal load, between the base and the emitter of the third and fourth transistors, the first and second secondary windings of the second decoupling transformer are included, respectively, and the emitter of the fourth transistor is connected to a common bus, distinguishing it by the fact that, in order to increase the linearity of the characteristic, between the second output of the first blanking resistor and collector the first transistor, and also between the second terminal of the second suppression resistor and the collector of the third transistor, the first and second additional secondary windings are introduced, respectively, inductively coupled to the first and second decoupling transformers, respectively, forming an inductive negative feedback.