SU1328803A1 - Regulator of d.c. mean value - Google Patents

Abstract

The invention relates to secondary power sources of radio equipment. The aim of the invention is to obtain the output voltage invariance in a wide range of measurements of the input voltage of the stabilizer of the average DC value. The goal is achieved by introducing a sawtooth voltage control unit 12 into the circuit, as well as a one-square multiplier 7 and an amplifier 6 with an adjustable gain. Moreover, the input of the multiplier 7 is connected to the output of the integrator 8, and the output to the control input of the amplifier 6. The error signal from the adder 5 is fed to the amplifier 6, the transmission coefficient of which is inversely proportional to the control. The signal from the amplifier 6 is summed with the signal of the integrator 8 on the adder 9 and through the comparison circuit 10 is applied to control the key 1. 1 sludge. F (L and on

Description

 . one

The invention relates to electrical engineering, in particular, to converters, electrical energy, and can be used in power supply systems of various technical devices with increased demands on the stability and accuracy of the supply voltage.

The aim of the invention is to obtain the invariance of the output current in a wide range of input voltage variations.

The drawing shows a stabilizer of the average value of direct current. The stabilizer contains a power switch 1, an LC filter 2, a current sensor 3 and a first integrator 4, the output of which is connected to the first input of the adder 5, the second input of which is connected to the voltage source, and the output to the first input of the amplifier 6 with adjustable transmission coefficient, the second input of which is connected through serially connected multiplier 7 and the second integrator 8 to the input of the device. The output of the amplifier 6 is connected to the second input of the adder 9, the first input of which is connected to the output of the second integrator 8, and the output is connected to the first input of the comparison circuit 10, the second input of which is connected to the output of the sawtooth generator 11. The output of the comparison circuit 10 is connected to the control input of the power switch 1. The input of the sawtooth voltage generator 11 is connected to the output of the saw voltage slope control unit 12, the control input of which is connected to the output of the second integrator 8.

The device works as follows.

The output current of the pulse-width stabilizer is converted by the current sensor 3 into a reverse surge voltage. After integration, in the integrator 4, the feedback voltage is fed to the input of the adder 5, where it is compared with the reference voltage. The error signal is fed to the amplifier 6 with an adjustable transmission coefficient, inversely proportional to the control effect, i.e., the "input voltage E . The control input of amplifier 6 is given a signal proportional to the square of the direct voltage

13

R , . nro o10

328803. 2

connection (E), taken from the input of the power switch 1 through the integrator 8 and the Odvokadrantrantnogo - multiply 7, After increasing the voltage from the output of the amplifier 6 with an adjustable transfer coefficient is fed to the adder 9, where it is summed with the voltage, taken from the output of the integrator 8, and fed to a comparison circuit 10, where it is compared with a sawtooth voltage. The parameters of the pilot voltage are varied by a cascade 12 controlling the steepness of the sawtooth voltage. The signal taken from the output of the comparison circuit 10 is fed to the control input of the power switch 1 and controls its operation, stabilizing the load current.

In order to ensure the invariance of the output current with a wide range of input voltage, the circuit is equipped with a cascade 12 controlling the ramp of the sawtooth generator of the sawtooth voltage and an amplifier 6 with an adjustable transmission coefficient, which is controlled by the input voltage, as well as a single-quadrant multiply: -1tel 7 „

1Choose, that the invariance of the output current in the previous circuit; the agaem scheme is achieved,

Stabilizer output current in static mode

20

2b

thirty

one"

.. EG, -o - where E is the stabilizer input voltage $

I is the duty cycle of the pulse-width converter, R is the resistive load. The increment of current at the output of the stabilizer, without taking into account the components of the second order of smallness, is defined as

AI 1 (

E.1)

(Y)

The closure equation of the stabilizer with a pulse-width converter and the combined regulation on the perturbation of the supply voltage E and the output current I has the form

and

five

Where

01

K.S- -o K- pr

(2)

Wasp -

static transfer coefficient of the feedback circuit; static transmission coefficient of the direct-link circuit by disturbance,

Un

G --- - modulator transfer ratio; T - switching period of the modulator

U (, is the constant reference voltage of the stabilizer Up — the amplitude of the sawtooth voltage.

Equation (2) is determined from the condition of equality of the output voltage of the circuit of the adder 9 and the voltage of the sawtooth generator 11 and the duty cycle of the pulses of the pulse converter is determined. Go to increments get

-K (, - KnpjE d-Tdy. (3)

Equation (1) is substituted into equation (3) and, after conversion, have

Kos R 3

+ K

etc

(s / t + e)

Ye. (four)

From equation (2) and equation 1 °

E That

 L: - determine the value

 and op - K pr E

°, t. TO

(five)

If we substitute equations (4) and (5) into equation (1), we get the following expression:

. 1, Ucn - Кпр Е J- - V - Т Е

and.

TO

 Е + К „„ С / ТЕ

(6)

ETC

) 4E.

(rfT +% - E) 2

TO

After transformations from exponential 6), the final equation is obtained

, with TC „pE (+

TO

| -E)

- LE. (7)

R (JT + E) 2

As is known from the theory of invariance, in systems of combined regulation, under certain conditions, one can achieve independent

of the adjustable parameter from the input disturbance, i.e. its invariance. The condition for obtaining the invariance of current 1 due to a change in the input voltage E is determined by equating the numerator of equation (7) to zero

ten

and"

TK, Rf2c / T + E 0. (8) R

This condition is fulfilled with an appropriate choice of the coefficient.

and K

wasp

namely

TO

VT Uon

ETC

E (2d4 +

TO,

OS R

E)

)

together (4)

about

shit

yy6)

and

7)

This condition satisfies only 2Q for a certain value of E (Equation 7) and is violated when it changes. To fulfill condition (8) when E varies widely, the following conditions must be met:

and „- E const; K.,; .- E const.

Thus, the numerator of the expression (7) becomes equal to O, and I does not depend on E when it changes over a wide range. This and the ratios are obtained by introducing into the circuit two amplifiers with an adjustable gain and a one-quadrant multiplier.

Claims (1)

Invention Formula 40 average stabilizer direct current, containing a power switch, an LC filter, a current sensor, a first integrator, the output of which is connected to the first input of the first adder, the second input of which is connected to a voltage source, and the second sum50, the first the input of which through the second integrator is connected to the input output, and the output of the adder to the first input of the comparison node, the second input of which is connected to the output of the sawtooth generator 55, and the output from the control input of the power switch, is different This is due to the fact that, in order to obtain the invariance of the output voltage in a wide 5 1328803 6 com range of the input inn is connected to the output of the second voltage, the integrator is entered into the device, and the output to the first input a twist control unit: a hot sawtooth amplifier with an adjustable voltage factor J whose input is transmitted inversely proportional to the output of the second integrator that is controlled by it: and the output to the control input of the generator is the second input of the amplifier from the sawtooth voltage regulator, which is driven by the gain coefficient and a one-quadrant multiplier and connected to the output of the first adder, an amplifier with an adjustable gain output to the second input of the second transfer document, and the input multiply-Sh mator.