SU813460A1 - Method of exponential conversion of analogue signal - Google Patents

Description

(54) METHOD FOR POWER PROGRAMMING ANALOG SIGNAL

A signal in time to the time point corresponding to the input signal equal to an exponentially decreasing signal, and depending on the power conversion rate, an additional time interval is accumulated; before forming an additional time interval, the exponential signal decreasing in time is obtained, , fixing the value of the reformed exponential-decreasing signal time in an additional time interval Change from the beginning of his decline.

On figi presents the block diagram of the device; figure 2 - diagrams of his work.

The device for power conversion contains a comparison unit 1, a control unit 2, an exponentially varying signal generator 3, a key 4, an analog storage unit 5, a pulse generator 6, a frequency divider 7, a fiepere switch 8, the first and second elements 9 and 10 , Element OR 11, reversible counter 12.

The device works as follows.

The control unit 2 starts the generator 3 of an exponentially decreasing in time signal / output voltage of which SCH) C, e1 (Fig. 2) is fed to the inputs of comparison unit 1 and key 4. As a result, the input voltage Uji with exponential ejection at the output of the comparison unit is rectangular impulse Ui (t), the duration of which tf is determined by the moments of starting generator 3 and the equality of the instantaneous values of the compared signals:

 -, where T is a constant of time;

UQ is the amplitude value of the exponentially decreasing voltage.

Simultaneously with the start of the generator 3, the control unit 2 supplies the element 9 and the reversible counter 12 with a control signal. If switch 8 is in the upper position, then pulses with frequency f c from generator 6 of pulses through element 9 and element 11 or 11 are summed by counter 12 during time t (in Fig. 2, U4 (t). This is how the time interval is measured In the next cycle, the control unit 2 restarts the generator 3, but at the same time, the counter 12 switches to the subtraction mode, allowing passage and passing from the output of the frequency divider 7 through the switch, tel.8, AND 10 element and the OR 11 element to the counting input reversible

the counter. at the time point corresponding to the transition of the reversible counter code 12 through the zero state, key 4 is closed and the instantaneous value of the decaying voltage exponential is stored in the analog storage unit 5.

Due to the different frequency of the pulses in the modes of addition and subtraction, the duration of the additional time interval tj is formed. The time corresponding to the zero code in the counter / is separated from the moment of restarting the generator 3 on. ta time:

. In view of the above, the output voltage of the device is defined by the following expression:

p-p

or

,

where n

fi

At the same time, the result of the transformation does not depend on the value of the time constant of the exponentially decreasing voltage, which indicates a high accuracy of the calculations.

In the considered case f, - .4 and, therefore,. To obtain the exponent, it is sufficient to turn the switch 8 to the lower position. At the same time, the frequency of the pulses at the counter input is in the addition mode fj (less than their frequency ft in the subtraction mode, which corresponds to the exponent n l.

Thus, the proposed method calculates power dependences with an exponent and has a wider transformation range than the known one.

Claims (2)

1. Smolov VB Analog computers M. G Higher School, 1972, pp. 229-230. 2.Assignment of the USSR on the application O 2438774/24, cl. G About G 7/20, 03/01/77.