SU1539744A1 - Piezoelectric/semiconductor control system - Google Patents

Abstract

The invention relates to secondary power sources of radio equipment. The aim of the invention is to maintain the maximum voltage at the output, to simplify and expand the area of stability. The goal is achieved by introducing a phase correction circuit into the device, and a control system direct circuit piezotransformer is used as the oscillator circuit of the discriminator. This allows the device to carry out a limiting oscillation cycle at the extreme value of the output voltage. Since both slopes of the amplitude-frequency characteristic of the piezotransformer are used in this device, the stability region expands. 1 hp f-ly, 1 ill.

Description

The invention relates to electronics, in particular, to piezoelectric technology, and can be used in electronic and converter technology.

The purpose of the invention is to maintain the maximum voltage at the output, to simplify and expand the area of stability.

The drawing shows the electrical circuit of the piee-semiconductor control system.

The circuit contains voltage amplifiers 1, connected in series with power amplifier 2, connected via a bridge circuit to which the inputs. a piezotransformer 3 is connected, where the inputs of the circuit of frequency discriminator 4, connected

outputs with amplifiers 5. A voltage divider 6 is connected to the output of the piezotransformer, whose output resistor 7 is connected between the middle points of the output and input circuits, the middle point of the input circuit being used as the middle point of the power supply. The elements controlled by the voltage from the discriminator with controlled resistance 8 are made on MOSFET transistors and are included in a phase-correction circuit 9 connected to the inputs of voltage amplifiers 1.

The device works as follows.

The discriminator 4 is made on a piezo transformer 3. When the frequency transitions through the resonant frequency of the piezotransformer 3, the output voltage

WITH

with sj

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The discriminator 4 changes its sign, and at the moment of resonance it has a phase shift of about 90 °, which corresponds to a zero value of the output voltage from the discriminator 4 n and the maximum voltage from the output of the piezotransformer 3.

The voltage-controlled resistances 8 are made on n-channel MOSFETs, their resistance increases with an increase in the negative voltage on the gate and decreases with an increase in the positive voltage on the gate.

The discriminator 4 and the controlled resistances 8 are included so as to reduce the mismatch between the resonant frequency of the piezo transformer ± ± n matching and the input pins,

thirty

ra frequency of the device as a whole. So, if the device frequency increases due to changes in the external parameters of the piezotransformer 3 devices, then using the discriminator 25 of the control resistances and the phase-correcting circuit, this frequency decreases and vice versa, and the gain of the amplifier 5 is somewhat higher than the critical one, overshoot is performed, but within the limits of the limiting cycle of oscillations at the highest value of the output voltage of the piezotransformer. In this way, the highest output voltage is obtained at a given source, piezotransformer, and load.

Without regard to estimates of the setting band and the holding band, we note that the stability region in this device expands, since here in the limit cycle mode both AFC slots of the piezotransformer are used.

with

by that

35

40

In order to maintain the output voltage max. 0, to simplify and draw the stability region, it has two amplifiers and a phase-matching bridge circuit, consists of two capacitors and two elements with controllable resistance. the minator, whose inputs are connected to the corresponding inputs of the piezo formatter, and the outputs through the corresponding amplifiers are connected to the connecting inputs of the corresponding components with a controllable resistance of the phase-correction circuit with the corresponding inputs of the power supply STI, and the conclusions of power - with the findings.

2. The system of claim 1, which is equal to the fact that the element with equal resistance is performed based on the field-effect transistor.

Q

five

matching and input pins,

0

five

The device is simplified, since the same piezotransformer 3 is included as an electoral element into two functional blocks — into the direct circuit of the control system and into the composition i of the discriminator 4; moreover, in the proposed device, compared to the known one, an additional controlled source generator and some other elements.

Claim I. Investigation of a piezo-semiconductor control system comprising a piezotransformer, inputs connected to the corresponding outputs of the power amplifier, and an output from the output terminals of the system, a node selecting the signal

by that.

about with

five

0

It is equipped with two amplifiers and a phase-correcting bridge circuit consisting of two capacitors and two elements with controllable resistance; the node for extracting the error signal is made on the frequency a discriminator whose inputs are connected to the corresponding inputs of the piezotransformer, and the output through appropriate amplifiers are connected to the control inputs of the corresponding elements with controllable oprotivleniem, Phase-correction circuit outputs are coupled to corresponding inputs of the power amplifier and the supply pins - with the input terminals.

2. The system of clause 1, clause 1 and h ai with the fact that the element with an adjustable resistance is made on the basis of a field effect transistor.

-V

Claims (2)

Claim 1. A piezoelectric semiconductor control system comprising a piezotransformer, inputs connected to the corresponding outputs of the power amplifier, and the output to the output terminals of the system, the node selection signal mismatch and input conclusions, characterized in that, in order to maintain the maximum voltage output, simplification and expansion stability region, it is equipped with two amplifiers and a phase-correcting bridge circuit consisting of two capacitors and two elements with controlled resistance, while the allocation unit error signal is made on the frequency discriminator whose inputs are connected to respective inputs piezotransformer and the outputs _{of the} amplifiers via respective control inputs connected to respective elements with the controlled impedance outputs fazokrrrektiruyuschey circuits associated with respective inputs of the power amplifier and the power output - to the input terminals. 2. The system according to π, I, is distinguished by the fact that the element with controlled resistance is made on the basis of a field-effect transistor. Compiled by S. Chernyshev Editor M. Petrova Tehred L. Oliinyk Proofreader S. Shekmar Order 218 Circulation 637 Subscription VNIIIPI of the State Committee for Inventions and Discoveries under the State Committee for Science and Technology of the USSR 113035, Moscow, Zh-35, Raushskaya embankment, d. 4/5 Production and Publishing Plant Patent, Uzhhorod, st. Gagarina, 101