Archangelsky converter

 

(57) Abstract:

The invention relates to measuring technique and can be used as a functional Converter to calculate the values of the functions arc tgk when k<1. The aim of the invention is to enhance the functionality while simplifying the structure of the Converter. This goal is achieved by the fact that the approximation is carried out in a range of angles from 0 to 4, which allows you to apply simple approximating function that was easy to do. The Converter comprises a controlled amplifier, an adder and a reference voltage. Used, an approximate function allows you to simplify the Converter, to provide a large dynamic range of input signals, high-speed, low truncation error of about 0.15oand low instrumental error, which does not exceed methodical. 1 Il.

The invention relates to measuring technique and can be used in various functional converters, when you are defining values arctan To high speed, low accuracy and ease of implementation in some interval of values of the argument.

atory, blocks of summation and subtraction of the voltage, the memory block, the block nonlinear correction, switches, and flow calibration. Its work is based on the approximation argument functions, logarithmic functions, orthogonal components.

The device is quite complex in design, has a low performance.

Know another device analog transnova Converter containing two resistors with zeropressure conductivity, resistor to zeropressure resistance and an operational amplifier.

The device requires the use of complex digital devices, which in combination with the analog signals irrational.

Known trigonometric functional converters time-pulse action based on the formation time intervals using a harmonic reference signal, for example, similar to the device in which to obtain the output signal, proportional to the value of arctan (z/x), use two balanced modulator, an adder and a comparator.

The device is quite simple in execution, but has low speed.

Know another device containing the adders S="ptx2">

The device is quite simple to implement, has low performance when using diodes in the feedback circuit of the logarithmic amplifiers, this type of approximation gives a large error 0.7aboutto change interval argument from zero to 4.

The closest General technical characteristics is functional Converter comprising the sensor signals, the controlled amplifier, adder, a controlled voltage reference, block Comparators, operational amplifier with adjustable feedback circuit with corresponding connections. The device performs automatic selection of the gain block when the deviation of the characteristics of the sensor from the linear law, however, does not allow the necessary trigonometric transformation.

The aim of the invention is to enhance the functionality while simplifying the structure.

This is achieved by the fact that in arctangent Converter containing an adder, a controlled amplifier and voltage reference, the output of which is connected to the first input of the adder, the information input of the control amplifier is the input of the Converter, the second input of the sum is d which is the output of the Converter.

The essence of the invention lies in the fact that with limited argument value, for example To < 1, the approximation can be done with a simple function with high precision, specifying select this function in the following form:

arctan K K f(k) for K < 1, (1) where the value of the argument;

f(k) and A K to f(k) < 1;

f(k) 1 f(k) 1;

A and the coefficients chosen from the condition of minimization of the approximation error.

The drawing shows a structural diagram Arkhangelskoe Converter.

It comprises a controlled amplifier 1, an adder 2, the voltage reference.

Blocks in arctangents the Converter is connected as follows. The input of the Converter is connected to the information input of the control amplifier 1 and the second input of the adder 2. The first input of the adder 2 is connected to the reference voltage Uop. The output of the adder 2 is connected to a second managing input of the control amplifier 1. The output of the controlled amplifier 1 is connected to the output Arkhangelskoe Converter.

Archangelsky the Converter operates as follows.

Input voltage Uxcorresponding to the value of the argument It comes to information/SUB> from the source of reference voltage. The value of Uopchoose in accordance with the following expression:

Ux(max)K(max)Uop(2) the Voltage Uopwhen K(max)1 is chosen equal to the maximum output signal, that is, UopUx(max). At the output of the adder 2 receive the voltage U2that depends on the voltage Ux. The voltage U2from the output of the adder 2 controls the gain of the controlled amplifier 1. This voltage U2is defined by the following dependency:

U2UcC Uxfor all voltages Uxwhen U2< U2maxand

U2U2maxfor all other values of Ux,

where UcA U2maxand With a U2max/Uopthe coefficients A and A are chosen in accordance with (1);

U2maxthe voltage at which the gain controlled amplifier 1, is equal to the unit. In this case, for simplicity, let us assume U2maxUop.

The condition U2U2maxcan be performed in different ways, for example by using the output stage with a limitation in the adder 2, so the cascade restrictions on the structural diagram is not shown and not a separate unit.

Thus, MK Ux/Uopyou can write

U2U2max(A aK). (4) This voltage U2is supplied to the control input of the control amplifier 1. The transmission coefficient of this controlled amplifier 1 is controlled using the voltage U2coming from the output of the adder 2. This voltage has a value in accordance with expressions (3), (4), so the output voltage can be written as follows:

U1UoUxf(k), (5) where UxUopK and f(k) A aK.

Consequently, the received expression in accordance with (1).

U1Uoarctan K K Uopf(k) for Ux/Uopwhere f(k) A-aK f(k) < 1;

f(k) 1 f(k) 1;

A and the coefficients chosen from the condition of minimization of the approximation error.

I.e. arctan K [( /4)/Uop]Uo( /4) K f(k), where Ux/Uopthe argument value of 0 To 1.0.

The approximation error of q can be obtained from the following expression: q 1 [K(A aK)/arctgK] To 1.

For example, when A 1,075 and 0.29 error q in dependence from 0 To 1 will change from 0 to 0.3abouttherefore, the truncation error will be equal to q/2 i.e. 0,15about. Instrumental error of the device will not exceed metodicheskoe implementation is not difficult.

The proposed Converter is very simple, consists of two operational amplifiers, one of which is used as an adder in the feedback circuit which includes a Zener diode, and the other OS is used as an adjustable amplifier, the maximum transmission coefficient of each block does not exceed one, so Uocan vary in a wide range of input signals.

ARCHANGELSKY CONVERTER comprising an adder, a controlled amplifier and voltage reference, the output of which is connected to the first input of the adder, the information input of the control amplifier is the input of the Converter, characterized in that in it the second input of the adder is connected to the input of the Converter, and the output connected with the control input of the control amplifier whose output is the output of the Converter.

 

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