SU1663755A2 - Automatic power stabilizing device - Google Patents

Abstract

The invention relates to radio engineering. The purpose of the invention is to increase the dynamic range. The automatic power stabilization device contains an adjustable stage 1, an output power amplifier 2, an output power sensor 3, threshold elements 4 and 9, discrete integrators 5 and 8, a controlled power supply 6, a residual voltage sensor 7, an OR element 10, an antenna matching unit 11, antenna 12. The goal is achieved by introducing a current sensor 13 consumed from a controlled power source, as well as by inserting a current-to-voltage converter 14 and an adder 15. In this device, a controlled voltage source voltage control system 6 chnika power keeps constant the amount of constituents in the adder 15, one of which is proportional to the residual voltage, and the other inversely proportional to current. In this case, in order to prevent overloading of the power amplifier 2, the device reduces the residual voltage on the collector of the transistor of the power amplifier 2. 4 il.

Description

The invention relates to radio engineering, can be used in radio transmitting devices and is an improvement of the device according to the authors. St. No. 1136306.

The purpose of the invention is to increase the dynamic range.

Figure 1 shows the structural electrical circuit of the automatic power stabilization device; Figures 2, 3 are circuit diagrams illustrating the construction of a current sensor consumed from a controlled power source of a current to voltage converter, the value of which is inversely proportional to the current value and the adder; Figure 4 shows the load characteristics for explaining the operation of the automatic power stabilization device.

The automatic power stabilization device contains an adjustable stage 1, an output power amplifier 2.

output power sensor 3, threshold element 4, discrete integrator 5, controlled power supply source 6, residual voltage sensor 7, additional discrete integrator 8, additional threshold element 9, OR-NE element 10, antenna matching unit 11 and antenna 12, as well as a current sensor 13 consumed from a controlled power source, a current converter to a voltage 14 and an adder 15.

The device works as follows.

Let the load of the output power amplifier 2 be the antenna 12 connected to the output of the output power amplifier 2 through the antenna matching unit 11 Then the high-frequency energy from the output of the output power amplifier 2 of the power goes to the antenna 12 through the antenna matching power unit 11. The output power is $ h WITH

about

the power amplifier 2 is monitored by the output power sensor 3 and converted into a direct control voltage that enters the input of the threshold element 4. High-frequency voltage V from the collector of the transistor output power amplifier 2 is fed to the residual voltage sensor 7, the second input of which From the output of the controlled power supply 6, the voltage of the collector power E of the output power amplifier 2 is supplied. The voltage from the output of the residual voltage sensor 7 is proportional to the difference E-V, i.e. the residual voltage on the collector of the transistor output power amplifier 2, is fed to the input of the adder 15 To another input of the adder 15 from the current sensor 13 through the current converter to the voltage 14 receives a voltage inversely proportional to the collector current of the transistor output power amplifier 2. The components of the output voltage of the adder 15 from the residual voltage sensor 7 and the current sensor 13 at 2N Рн0пт are equal and equal to each half of the response threshold of the additional threshold element 9 (where ZH is the load impedance; Рн0пт load resistance in the optimal mode). Depending on the change in the load impedance ZH, the mode of the output power amplifier 2 with a constant supply voltage of the power amplifier 2 may vary from under-stressed when (E-V) e0DT, a ZH RHom

before overstretched when

() eopt a ZH RH0nT

where e0pt is the optimal residual voltage.

The interaction of the current sensor 13, the converter 14 and the adder 15 is illustrated by the segments of the dynamic characteristics shown in FIG. 4 (segments B, D, E are for the known device, and segments A, B, D are for the proposed device; A, B - for ZH RHonT; C, D - for ZH RH0rn: D, E - for ZH RH0nT.

In the known device, regardless of the load impedance, the residual voltage remains unchanged and is equal to e, therefore, when the current changes from m D ° Ik, the voltage at the output of power supply 6 changes from E1ki to E1k2. In the proposed device, when the current changes from in to ik2, the residual voltage changes from ei to 62, therefore the voltage at the output of power supply 6 changes from Ect to Ek2, which are smaller than Eki and in a known device.

the fact that in the proposed device the voltage control system of the controlled power supply 6 maintains the sum of the components in the adder 15,

one of which is proportional to the residual voltage, and the other is inversely proportional to the current.

If ZH RrionT then (Е-У) еОПт, and, at the output of the additional threshold element 9, a logical zero signal appears, which is fed to the additional discrete integrator 8 and to the input of the element OR NOT 10. By this signal the additional discrete integrator 8 provides a reduction in collector power supply voltage. At the same time, at the output of the threshold element 4, a logical zero signal also appears, which is fed to the second

0 input of the element OR NOT 10 Since the logical zero signal appears at both inputs of the element OR NO 10, a signal of a logical unit is transmitted at its output. This signal is a discrete integrator 5

5 provides an increase in the excitation voltage and a proportional increase in the current and high-frequency voltage of the output power amplifier 2, as well as an inversely proportional change

0 (decrease) of the voltage at the output of current sensor 13, which allows to increase the residual voltage on the collector in steady state

If g Knopt 1 then (E-V) e0riT, and output 5 on power P may be both more and less than P0pt.

When the output of the threshold element 4 appears a signal of a logical unit, however, since (E-V) e0ni,

0, the output of the additional threshold element 9 also appears as a signal of a logical unit; therefore, at the output of the element OR NOT 10, a signal of logical zero appears, according to which the discrete integrator 5

5 Provides a reduction in the excitation voltage and a proportional decrease in the current and high-frequency voltage of the output power amplifier 2. Simultaneous signal of a logical unit

0 comes from the output of the additional threshold element 9 to the output of the additional discrete integrator 8, which provides an increase in the voltage of the controlled power source 6. Insofar as

5, when the collector current decreases, the voltage at the output of the converter 14 increases, the residual voltage on the collector decreases, which makes it possible to reduce the voltage of the controlled power supply 6

At the output of the threshold element 4, a logical zero signal appears, however, since (EV) e0nr, the signal of a logical unit appears at the output of the threshold element 9, therefore a logical zero signal appears at the output of the OR-NOT 10 element, the integrator 5 provides a reduction in the drive voltage applied to the output power amplifier 2.

Consequently, despite the fact that the output voltage of the output power sensor 3 in the first case receives a control voltage corresponding to the need to reduce the excitation voltage, and in the second case increases, in both cases the discrete integrator 5 of the adjustable stage 1 receives a logical zero signal in which it provides a decrease in excitation voltage. Such a decrease occurs until a logical zero signal is received from the output of the additional threshold element 9, i.e. when (E-V) eorn. Such an algorithm is necessary in order to prevent overloading of

power module in the process of increasing the voltage of the collector power E pr

  In this case, in both cases, the residual voltage on the collector of the transistor of the output power amplifier 2 is simultaneously reduced.

Claims (1)

Claim of the invention. Automatic power stabilization device according to auth. No. 1136306, characterized in that, in order to increase the dynamic range, a current sensor consumed from a controlled power source, a current-to-voltage converter, the value of which is inversely proportional to the current value consumed from controlled power source, and an adder, while the residual voltage sensor and an additional threshold element are connected in series through an adder, another input of which is connected to the output of the current-to-voltage converter, and which is inversely proportional to the magnitude of the current. 1 From sh K .2,1 C G g UJ IT 3fe- W and R " FIG. g U l l teJ Cd .9 R Lg7Dl7 hee / - I -f L lgl / IT ft Ъ EKI fit BK Pff & 4 J fat J