RU208079U1 - CONTROLLED PHASE REFRACTOR - Google Patents

Abstract

The utility model relates to measuring technology and can be used in the construction of measuring transducers, where it is necessary to control the phase of a sinusoidal signal. The controlled phase shifter contains a phase shift unit by 90°, the first and second controlled voltage dividers, an adder, a scaling unit, an inverse cosine converter, a sine shaper and an inverter. The signal input of the device is connected to the inputs of the first controlled voltage divider and the 90° phase shift unit, the output of which is connected to the input of the second controlled voltage divider, the outputs of the first and second controlled voltage dividers are connected respectively to the first and second inputs of the adder, the output of which is connected to the first output device and an inverter, the output of which is the second output of the device, and the control input of the device is connected to the input of the scaling unit, the output of which is connected to the control input of the first controlled voltage divider and the input of the inverse cosine converter, the output of which is connected through the sine shaper to the control input of the second controlled voltage divider. The technical result of the claimed utility model is to simplify the device and improve accuracy. 2 ill.

Description

The utility model relates to measuring equipment and can be used in the construction of measuring transducers where it is necessary to control the phase of a sinusoidal signal.

Known controlled phase shifter [USSR author's certificate No. 1402962 IPC G01R 25/00, publ. 06/15/1988], two controlled voltage dividers, a phase shift unit by 90 °, an adder, a comparison unit and an inverter, in which the signal input is connected directly to the first input of the comparison unit and to the signal input of the first controlled voltage divider, and through the shift unit phases by 90 ° - with the signal input of the second controlled voltage divider, the control inputs of the first and second controlled voltage divider are connected, respectively, with the control input of the phase shifter and the output of the comparison unit, and the outputs, respectively, with the first and second inputs of the adder connected by its output directly to the second input the comparison unit and the first output of the phase shifter, and through the inverter - with the second output of the phase shifter.

The disadvantage of the known phase shifter is its low speed due to the inertia of the comparison unit.

The closest analogue to the proposed utility model is a controlled phase shifter [USSR author's certificate No. 1721536 IPC G01R 25/00, publ. 03/23/1992], containing two controlled voltage dividers, a phase shift block by 90 °, two quadrators, two adders, a reference voltage source and an inverter, in which the signal input is connected directly to the signal input of the first, and through the phase shift block by 90 ° - with the signal input of the second controllable voltage divider, the control input of the second controllable voltage divider is connected to the control input of the phase shifter, and the output is connected to the first input of the first adder, the second input of the first adder is connected to the output of the second controllable voltage divider, and the output is directly connected to the first, and through the inverter - with the second outputs of the phase shifter, while the first (direct) input of the second adder is connected to the output of the reference voltage source, the second (inverse) input - to the output of the first quadrator connected by its input to the control input of the phase shifter, the third (inverse) input - with the output of the second square, and the output with the fourth (direct) input, with the input of the second square pa and with the control input of the second controlled voltage divider.

This technical solution was chosen as a prototype.

The disadvantage of this phase shifter is the large number of operating units, which reduces the accuracy of the device. In addition, the device uses a reference voltage source proportional to the square of the amplitude value of the control signal, the stability of which also affects the accuracy of the device. In this case, when calculating the sine of the phase shift angle, the operation of extracting the square root is performed, which leads to an increase in the square of the signal of the instability error of the reference voltage source.

The technical result of the claimed utility model is to simplify the device and improve accuracy.

The specified technical result is achieved by the fact that in a known controlled phase shifter containing two controlled voltage dividers, a 90 ° phase shift unit, an adder and an inverter, the signal input of the device is connected to the inputs of the first controlled voltage divider and a 90 ° phase shift unit, the output of which is connected with the input of the second controllable voltage divider, the outputs of the first and second controllable voltage dividers are connected, respectively, with the first and second inputs of the adder, the output of which is connected to the first output of the device and the inverter, the output of which is the second output of the device, an arccosine converter, a sine shaper and a scaling unit are additionally introduced , and the control input of the device is connected to the input of the scaling unit, the output of which is connected to the control input of the first controlled voltage divider and the input of the inverse-cosine converter, the output of which is connected through the sine shaper to the control input of the second control removable voltage divider.

Significant differences of the proposed device are the introduction of an additional arc-cosine transducer, a sine shaper, a scaling unit and the organization of new connections between the elements of the device. The combination of elements and connections between them provide a positive effect - simplifying the device and increasing the accuracy of the phase shifter.

The essence of the utility model is illustrated by drawings. FIG. 1 shows a functional diagram of a frequency meter, FIG. 2 - dependences of the phase shift angle ϕ and voltages u ₂ and u ₄ on the control voltage U _y .

The controlled phase shifter contains (Fig. 1) a 90 ° phase shift unit 1, the first and second controlled voltage dividers 2 and 3, an adder 4, a scale unit 5, an arc-cosine converter 6, a sine driver 7 and an inverter 8.

The device works as follows. The input sinusoidal AC voltage u _in = U _{m in} sinωt (Fig. 2) with a frequency of ω is fed to the inputs of the first controlled voltage divider 2 and a phase shift unit by 90 ° 1, at the output of which a voltage is generated u ₁ = U _{m in} cosωt and is fed to the input of the second controlled voltage divider 3.

At the same time, the control voltage U _y is applied to the input of the scaler 5. When choosing the value of the control voltage U _v = ± 10 V, the transmission coefficient of the scaling unit 5 is selected equal to K _p = 0.1. As a result, at the output of the scaler 5, a voltage u ₂ = cosϕ with a unit amplitude is _{obtained, proportional to the control voltage U y} (Fig. 2), which is fed to the control input of the first controlled voltage divider 2. The dependence u ₂ = f (U _y ) is linear (Fig. 2).

After converting the voltage u ₂ = cosϕ in the arc-cosine converter 6, a voltage u ₃ proportional to the value of the phase shift angle ϕ is formed at its output. The voltage u _{3 is} fed to the input of the sine shaper 7, at the output of which a voltage u ₄ = sinϕ with a unit amplitude is formed (Fig. 2) and fed to the control input of the second controlled voltage divider 3. The dependence u ₄ = f (U _y ) is a semicircle with a unit radius (Fig. 2).

Controlled voltage dividers 2 and 3 perform the operation of multiplying the corresponding input signals u _in = U _{m in} sinωt and u ₁ = t _{m in} cosωt by the received signals u ₂ = cosϕ and u ₄ = sinϕ (the operation of multiplying by signals less than one, i.e. that is, in fact, the operation of division). The output signals of the controlled voltage dividers 2 and 3 are summed up in the adder 4, at the output of which and at the first output of the phase shifter, according to the well-known trigonometric expression, the voltage u _{out1 is formed} :

u _out1 = (U _{m in} sinωt) cosϕ + (U _{m in} cosωt) sinϕ = U _{m in} sin (ωt + ϕ).

Thus at the second output of the phase shifter, after inversion by inverter 8 u _OUT1 voltage generated voltage u _Out2:

u _out2 = U _{m in} sin (ωt + 180 ° + ϕ) = U _{m in} sin [ωt- (180 ° -ϕ)].

It follows that the controlled phase shifter allows you to shift the phase of the input voltage when U _y changes in the range from -10 V to +10 V by ϕ ₁ (at output 1) from 180 ° to 0 °, and - by ϕ ₂ (at output 2) from 0 ° to -180 ° (Fig. 2).

As a result, the proposed controlled phase shifter provides a phase shift of the input voltage within 180 ° when the control voltage U _y changes within ± 10 V. The dependences of the phase shift angles ϕ ₁ and ϕ ₂ on U _y are shown in FIG. 2.

Thus, the introduction of an arc-cosine converter, a sine shaper and a scaling unit into the controlled phase shifter and the organization of new connections between the elements of the device led to the achievement of a technical result - a simplification of the device and an increase in accuracy.

In the practical implementation of the proposed controlled phase shifter, the phase shift unit by 90 ° 1 can be performed according to the scheme (RF Patent No. 127554, Н03В 27/00. Quadrature signal generator, 04/27/2013). Controlled voltage dividers 2 and 3 can be performed on a voltage multiplier microcircuit K525PS3 with a transfer coefficient equal to unity, made according to the scheme (Kolombet E.A. Microelectronic means of processing analog signals. - M .: Radio and communication, 1991, p. 75, Fig. 3.12, a). Adder 4 is a conventional two-input non-inverting adder based on an operational amplifier (OA). Scaling unit 5 is a non-inverting op-amp amplifier with a gain of 0.1. Arc-cosine converter 6 can be performed according to one of the schemes (RF Patent No. 2072555, G06G 7/22. Arc-cosine converter, 01/27/1997) or on an op-amp, turning on the cosine shaper, made according to one of the schemes (A. J. Peyton, V. Walsh . Analog electronics on operational amplifiers. - M .: BINOM, 1994, p. 271, fig. 10.10; Timonteev V.N., Velichko L.M., Tkachenko V.A.Analog multipliers of signals in radio-electronic equipment. - M. : Radio and communication, 1982, p. 66, fig. 4.25), in the chain of its negative feedback. The sine shaper 7 can be made according to the scheme (Timonteev V.N., Velichko L.M., Tkachenko V.A. - M .: Radio i svyaz, 1982, p. 65, fig. 4.21, p. 66, fig. 4.22). Inverter 8 is a conventional unity-gain op-amp inverting amplifier.

Claims (1)

A controlled phase shifter containing two controlled voltage dividers, a 90 ° phase shift unit, an adder and an inverter, the signal input of the device is connected to the inputs of the first controlled voltage divider and a 90 ° phase shift unit, the output of which is connected to the input of the second controlled voltage divider, the outputs of the first and the second controllable voltage dividers are connected respectively to the first and second inputs of the adder, the output of which is connected to the first output of the device and the inverter, the output of which is the second output of the device, characterized in that an arccosine converter, a sine shaper and a scaling unit are additionally introduced into it, and the control the input of the device is connected to the input of the scaling unit, the output of which is connected to the control input of the first controlled voltage divider and the input of the inverse-cosine converter, the output of which is connected through the sine driver to the control input of the second controlled voltage divider.

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