SU1683151A1 - Converter of orthogonal voltages into d c voltage - Google Patents

Abstract

The invention relates to electrical engineering, in particular to the conversion of alternating voltage to constant, and can be used in high-speed automatic control systems. The purpose of the invention is to reduce output voltage ripples by compensating for its variable component. The device consists of negative and positive rectifiers 9-12 connected to the input terminals 13, 14, the outputs of which are connected via resistor 4, 5 and 7, 8 3 to the inverting and non-inverting inputs of the operational amplifier 1, respectively, to which one of the terminals are connected resistors 2,3, the other terminals of which are connected respectively to the output of amplifier 1, connected to the output terminal 15 and the common bus. The device is additionally equipped with a triangular voltage driver 16 and single-voltage rectifiers 17.18 positive and negative voltages, the outputs of which through resistors 6 and 19, respectively, are connected to the inverting and non-inverting inputs of amplifier 1, and the inputs to the output of the 16, four inputs which are connected to the outputs of the respective rectifiers 9-12. The introduction of these elements makes it possible to form a compensating voltage, by means of which the average value of the output voltage is maintained equal to the amplitude value of the input voltages. 1 hp f-ly, 2 ill. O 00 has eaten

Description

The invention relates to electrical engineering, in particular, to the conversion of alternating voltage into a constant voltage, and can be used for high-speed control systems.

The object of the invention is to reduce the output voltage by compensating for its variable component.

Fig. 1 shows a diagram of the conversion of orthogonal stresses into a constant; On fmg.2 - time diagrams that explain the principle of operation.

The orthogonal voltage ъ constant constant (Fig. 1) contains an operational amplifier 1. between the inverting input and the DW input of which the first 2 is turned on, and between the non-inverting input and the common input is the third 3 resistive coupling resistors, the third 4, the fourth 6 and n 6 resistors, the common connection point of which is connected to the inverting (. the turn of the operational amplifier 1, the sixth 7 l seventh 8 resistors, the common connection point of which is connected to the non-inversion input of the operating amplifier 1, the first 9 and the second 10 half-wave The positive voltage drivers, as well as the first 11 and second 12 half-wave negative voltage rectifiers, are connected to the outputs of which are connected to the third, the fourth, the fourth, the sixth, the seventh and the seventh 8 resistors, the first 13 "second 14 input terminals of the orthogonal converter voltage to a constant connected to the inputs of the first 9 and 11, respectively, and the second 10 and 12 half-wave rectifiers of the positive and negative voltages, the output of the operational amplifier 1 is connected to the output terminal 15 the orthogonal voltage generator is constant, additionally also contains a triangular voltage shaper 16 with four inputs, a third one-half-wave rectifier 17 positive voltage and a third one half-wave rectifier 18 negative voltage, the inputs of which are interconnected and connected to the output of the shaper 16 triangular voltage and the eighth resistor 19, which is connected between the non-inverting input of the operational amplifier 1 m output of the third half-wave rectifier 18 negative Nogo voltage, the outputs of the first 9 and second 10 odmopolupermodnyh rectifiers positive voltage and outputs a first 11 and second 12 half-wave

rectifiers negative voltage connected respectively to the third, first, second and fourth inputs of the former 16 triangular voltage, and

A free resistor pin is connected to the output of the third half-wave rectifier 17 positive voltage.

The triangular voltage driver 16 is made up of an operational amplifier 20, between the inverting input and the output of which the first 21 is connected, and between the inverting input and the common busbar - the second 22 feedback resistors,

the first 23 and second 24 resistors, the common connection point of which is connected to the inverting input of the operational amplifier 20, the third 25 and the fourth 26 resistors, the common connection point of which is connected to the non-inverting input of the operational amplifier 20, the output of which is connected to the output of the delta voltage transformer 16, to the first, second, third and fourth inputs of which are connected to the free conclusions of the first 23, second 24, third 25 and fourth 26 resistors, respectively.

The Converter operates as follows.

Operational amplifier 1, feedback resistors 2 and 3, as well as resistors 4, 5, 6 and 7, 8, 19 form an addition-subtraction circuit with three inverting and three non-inverting inputs.

The first input 13 is supplied with the voltage ei (t) UmSln (о t, and the second input 14 - the voltage ea (t) Umcos ш t (Fig. 2a), shifted by 90 ° with respect to the voltage ei (t) , where Dm is the amplitude value of alternating voltages; w 2n i is the frequency of orthogonal voltages.

The positive half-waves of the input voltages ei (t) and 62 (0 pass through half-wave rectifiers 9 and 10 and

are supplied respectively to the first and second inverting inputs of the addition-subtraction circuit,

The negative half waves of the input voltages ei (t) and e2 (t) pass through the half-wave rectifiers 11 and 12 and are fed to the first and second non-inverting inputs of the addition-subtraction circuit, respectively.

In the absence of compensating overload UK1 at the third inverting input and voltage U 2 2 at the third non-inverting input, the voltage I and 1 out at the output 15 of the converter is determined by the sum of the voltages Ui and IJ2 at the inverting inputs and the voltage Kz and U4 at the inverting inputs of the folding circuit - subtraction:

U out - (miUi + maUa) + (SSS + nalM), where mi R2 / R4 and m2 R2 / Rs are the transfer coefficients for the first and second inverting inputs, respectively;

ni R3 / R and 02 Rs / Rs are the transmission coefficients for the first and second non-inverting inputs, respectively.

When pi gp2 ni P2 a. At the output 15 of the converter, there will be a pulsing (with a double frequency) voltage U out of negative polarity (Fig. 26):

U

out

a (U3 + U4-Ui-U2).

a positive voltage is fed to the third inverting input of the addendum-subtracting circuit with a transfer ratio R2 / R6. Negative half wave

 a triangular voltage U0, having passed through a half-wave rectifier 18 negative voltage, is fed to the third non-inverting input of the addition-subtraction circuit with a transfer coefficient / 3 R3 / R19.

The sum of the two voltages U "1 and Uk2 gives the resultant voltage UK (Fig. 2e), which is compensating and the value of which is

UK - # -UK1 + fc UK2

A triangular voltage driver 16 is formed by an operational amplifier 20, feedback resistors 21 and 22, and also resistors 23-26,

The positive input half-wave Ui arrives at the third input of the triangular voltage driver 16, and the second input voltage Ui ei (t) is negative at the second input. The sum of the voltages Ui + Us gives a pulsating voltage EI (Fig. 2c) of positive polarity.

The positive input half-wave IJ2 arrives at the first input of the triangular voltage generator, and the half-input u of the input voltage e2 (t) is negative at the fourth input. The sum of the voltages U2 + U4 gives a pulsating voltage E2 (Fig. 2d) of negative polarity,

As a result of the summation of the voltages EI and E2 at the output of the triangular voltage former 16, there will be a voltage Uo (Fig. 2e) close to the triangular voltage, the value of which

Uo - (KiU2 4 K2U3) + (Kz1I + K4U4),

where Ki R21 / R23 and K2 R21 / R24 are the transfer coefficients for the first and second inverting inputs respectively

Кз R22 / R26 and К4 R22 / R26 are transmission coefficients for the third and fourth non-inverting inputs, respectively.

When Ki Kg Кз «4 K, the output voltage of the former 16 triangular voltages

Uo - K (Ui + U4 - U2 - of)

The half-wave UK of the triangular voltage U0 is positive, passing through a half-wave rectifier 17

At) 8i / fc P the compensating voltage is equal to

(UK2 -UKI)

As a result of the summation of the two voltages U1 and UK at the output 15 of the orthogonal voltage converter into a constant, the output voltage (Fig. 2g) UBHX and 1х + UK is formed, the value of which (with K1) is

UBb "-2Uffl (o: - / 3) Grt + (a + Ј) cos al

When choosing the transfer coefficients ai / addition circuit

a l

ъ 0,335 and

16 V2 (V2 - 1) (V5 -1) x 0.139

the mean value Eqp of the output voltage of the converter of orthogonal voltages into a constant is exactly equal to the amplitude value Um of the input voltages ei (t) and e2 (t):

Jih

(. - -S-J2 rfy-e) iinot W "j5 costOtldUt ccpl l JOLJ

 Um (o (s) (YT)) + (“C) - | ol B (/ 2-f) lW-Un ,.

The technical and economic effect is to reduce the ripple at the output of the converter. The ripple factor is the ratio of the difference between the maximum Emax and the minimum Emin values of the output voltage value.

Uvih converter to double the average value of the ECP for the period.

In the absence of a compensating voltage, the ripple factor

100

  (/ I-1). , 27%

If there is a compensating wife

 Emax Emln

 Urn

100

Where

Emqx-2ym W-p) sin | (Et; n - 2 Um (d-p) sin + JO MSO

does not exceed 3.85%,

Claims (2)

Claim 1. An orthogonal voltage-to-constant voltage converter containing the first and second input and output pins for connecting a power supply and a load respectively, as well as an operational amplifier, between the inverting input and the output of which is connected the first and between the non-inverting input and common busbar - the second feedback resistors, the third, fourth and fifth resistors, the common connection point of which is connected to the inverting input of the amplifier, the sixth and seventh resistors, and whose connections are connected to the non-inverting input of the op-amp, the first and second single-half-wave rectifiers of the positive voltage, and the first and second single-half-wave negative voltage rectifiers, to the outputs of which the free outputs of the third, fourth, sixth and seventh are connected resistors, the first and second input pins are connected to the inputs of the first and second half-wave rectifiers, respectively 0 five 0 5 0 5 0 5 positive and negative voltages, the output of the operational amplifier is connected to the output terminal, characterized in that, in order to reduce the ripple of the output voltage by compensating for its variable component, a triangular voltage driver with four inputs is added, the third half-wave rectifier of the positive voltage and the third half-wave rectifier of negative voltage, the inputs of which are interconnected and connected to the output of a delta voltage shaper and the eighth resistor, which is connected between the non-inverting input of the operational amplifier and the output of the third one-half-wave negative voltage rectifier, while the outputs of the first and second one-half-wave positive voltage rectifiers and the outputs of the first and second one-wave rectifier of the negative voltage are connected to the third, the first, second, and fourth inputs of the triangular voltage driver, and to the output of the third half-wave rectifier of positive voltage direct voltage output is connected free fifth resistor. 2. The converter according to claim 1, wherein the triangular voltage driver is made of an operational amplifier, between the inverting input and the output of which the first is turned on, and between the non-inverting input and the common bus - the second feedback resistors, first and second resistors, the common connection point of which is connected to the inverting input of the operational amplifier, the third and fourth resistors, the common connection point of which is connected to the non-inverting input of the operational amplifier, the output of which Inonii with the output of the delta voltage to the first, second, third and fourth inputs of which are connected leads, respectively, the first, second, third and fourth resistors. Oh oh X7  g / f h b y d Oh oh / XyywWN t -sr 2 & and byk ch / t -sr 2 & FIG. 2