Method for controlling constant voltage pulse stabilizer

FIELD: electric engineering.

SUBSTANCE: for controlling constant voltage pulse stabilizer current value of stabilized voltage is measured, measured value is compared with constant support voltage, on basis of discordance signal by means of synchronization voltage of saw-like shape broad-pulse modulated signal is formed, used for controlling adjusting stabilizer element. Also, this signal is demodulated and received correction signal is added to discordance signal. When selecting correction signal transfer coefficient, static error value of voltage stabilization is corrected. It is possible to ensure equality of static error to zero by selecting transfer coefficient appropriately. Current control method is effective for different variants of direct voltage converters (of increasing, decreasing and inverting types) and different modes of their operation (as with continuous, as with discontinuous stabilizer throttle currents).

EFFECT: lesser static error of voltage stabilization in case of external interference (change of inlet voltage or load resistance, influence of non-ideal elements of stabilizer power circuit).

3 dwg

 

The invention relates to electrical engineering, and in particular to methods of control pulse DC-DC converters.

Known way to control pulse stabilizer, constant voltage based on the pulse width modulation control signal regulating element, namely, that compare the current value of the stabilized voltage with a constant reference voltage based on the amplified signal of the error by using the voltage of the sawtooth-shaped PWM control signal regulating element (power key) [1, C; 2, S. 89].

Pulse converters, managed in this way are characterized by the presence of static errors of the voltage determined by the amplitude of the sawtooth voltage and the gain of the signal amplifier of the error.

The present invention solves the problem of minimizing static error voltage regulation.

According to the proposed method, this task is solved as follows.

To control pulse stabilizer, constant voltage and measure the current value of the stabilized voltage, compare the measured value with a constant reference voltage, with the result of the error signal and the sawtooth voltage forms the shape of the PWM control signal regulating element of the stabilizer. With the error signal summarize the correction signal obtained by demodulation of PWM control signal regulating element. Moreover, the gain of the correction signal is chosen based on the desired static error voltage regulation.

An example of structural-functional scheme of the stabilizer, which implements the proposed method, shown in figure 1.

The power circuit of the stabilizer includes input 1 and output 2 filters, as well as the regulating element 3. The control unit of the stabilizer to form a first 4 and second 5 adders, the comparator 6, the generator of the sawtooth voltage 7, the demodulator 8.

The inputs of the adder 4 serves the measured output voltage Uwiththat need to be stabilized, and a constant reference voltage Uaboutthat sets the desired value of the stabilized voltage. Received the error signal is fed to one input of the adder 5, the second input of which is converted by the demodulator 8 output PWM signal of the comparator 6, used for control of the regulating element 3.

The formation of the PWM signal can occur in different ways. In the case of forming the PWM signal with the duty cycle, defined by the formula

where Uhe drank.the amplitude of the sawtooth voltage;

Uy=(Uwith-U0)+Uto(1-KC)Kto- the control voltage at the input of the comparator 6;

(Uwith-U0) signal mismatch;

Uto(1-KC)Ktosignal correction;

Utothe amplitude of the pulses at the output of the comparator 6;

Uto(1-KC- the amplitude of the demodulated PWM signal;

Toto- transfer coefficient of a correction signal, after transformations we can obtain

Schedule according To theC=f(Uc) is shown in figure 2.

Segment a in figure 2 represents the maximum static error stabilization Ucwhen UtoToto=0. The ratio selection signal correction can reduce the value of the static errors and′.

From (3) it is obvious that when selecting a gear ratio equal to

a static error is equal to zero

Uc=U0.

It is easy to show that in the case of forming the PWM signal with the duty cycle, defined by the formula

where: Uy=(U0-Uwith)+UtoKCKto- voltage control;

(U0-Uwith) signal mismatch;

UkToCTotosignal correction;

UtoKC- amplit is Yes demodulated PWM signal,

fair expression

and

that is, when choosing Totoin accordance with the expression (4) obtained a similar result

Uwith=U0.

As an example, consider a voltage step down type with a serial connection of a regulatory element and a smoothing inductor output filter (figure 3), where PI is the power supply voltage E; Rn- load resistance; ρn=1/Rnthe conductivity of the load.

Static control characteristics of the power part of stabilizer is determined by the equality

where r0that is the total resistance of the power circuit of the stabilizer, which characterize the imperfection of its elements.

After simple transformations we can show that a fair expression:

Substituting (2) into (9), after transformations we obtain:

where

Hence, for Kto=Udrank/Uto(i.e. when a=0), Uc=U0.

Thus, a static error voltage is zero.

In the General case for switching regulator of any type there is a dependency ratio is zapolneniya from the input or output voltage, load power Pnthe inductance L or other parameters

The control unit of the stabilizer generates a PWM control signal regulating element with the fill factor, defined by equation (2) or (6).

Equating the right hand sides of equations (9) and (2) or (6), we obtain

If selected gear ratio in accordance with (4) we get A=0, Uc=U0then there is a stabilized voltage does not depend on the parameters of the function F.

The use of the proposed method stabilizer control allows you to reduce the static error voltage. Choosing the gear ratio of demodulated PWM signal, you can adjust the amount of static errors. When the transmission coefficienta static error is equal to zero when exposed to various destabilizing factors (change E ρn, r0...).

This control method is effective for different variants of the DC-DC converters (buck, boost and inverting types) and different modes of operation (as in Beresnevich and discontinuous currents throttle stabilizer).

SOURCES of INFORMATION TAKEN INTO account OL THE DRAFTING

1 Khusainov CI the high-Frequency pulse stabilizers, constant voltage. M: Energy, 1980.

2 Sergeev, B.S. Schematic functional units of the secondary power supply sources: a Handbook. M.: Radio and communication, 1992.

The method of controlling a pulse stabilizer, constant voltage based on the pulse width modulation control signal regulating element, which consists in the fact that the measured current value of the stabilized voltage, compare the measured value with a constant reference voltage, on the basis of the error signal and the sawtooth voltage form the PWM control signal regulating element of the switching regulator, wherein the c signal mismatch summarize the correction signal obtained by demodulation of PWM control signal regulating element, and the gain of the correction signal is selected based on the desired static error voltage regulation.



 

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