JPH05175880A - Transmitting power controller - Google Patents

Abstract

(57) [Summary] [Object] The present invention relates to a transmission power control device for maintaining a constant transmission power in a transmission unit of a communication device,
It is an object of the present invention to shorten the convergence time to a specified output power and to be able to follow a signal with a short cycle. [Structure] A transmission power amplification means 1 for amplifying transmission power provided in a transmission section, a transmission power detection means 2 for detecting transmission power from an output of the transmission power amplification means 1, and a detection for the transmission power detection means 2. Based on the result, the first transmission power control means 3 for controlling the transmission power so that the output of the transmission power amplification means 1 becomes constant, and the temperature detection means 4 for detecting the temperature of the transmission part and the input to the transmission part. If there is no signal, the second transmission power control means 5 for controlling the transmission power based on the detection result of the temperature detection means 4 is given priority over the control by the first transmission power control means 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transmission power control device for maintaining a constant transmission power in a transmission section of a communication device. In recent years, as the importance of information and communication has risen significantly, environment improvements such as the launch of private communication satellites have been carried out in the field of satellite communication as well, and there is a demand for small, easy-to-use communication devices. ..

For this reason, although a transmission power amplifying device using a semiconductor is provided also in a radio device, in a radio transmission device, an excessive output has a bad influence on other lines, and thus is strictly regulated. Further, since a high-quality line cannot be set in a state of insufficient output, the transmission output power needs to be constantly controlled to a constant value.

[0003]

2. Description of the Related Art In conventional transmission power control methods, ALC (automatic level control) and AGC (automatic gain control) are often used. Here, the automatic level control is for controlling the output level to converge to a certain constant value, and the automatic gain control is for controlling the gain between the input and the output to be a constant value. For example, the output power is controlled to be constant.

Which method to use depends on the requirements of the system, so it cannot be decided unconditionally, but if satellite communication is taken as an example, ALC is adopted when a continuous signal is used like video transmission. Often. This is mainly because the output power is predetermined, that is, the convergence value of ALC control is fixed. On the other hand, when the number of signals transmitted by packet transmission of data, voice, FAX, etc., so-called wave number, changes with time, AGC
Often.

Of course, this is not the only determinant of the system, so the above is only an example. By the way, FIG. 4 is a block diagram showing a conventional transmission power control apparatus.
In 41, 41 is a voltage variable attenuator, and this voltage variable attenuator 41 increases or decreases the transmission power. Four
2 is a transmission power amplifier, and this transmission power amplifier 42
Is composed of transistors and FETs and amplifies transmission power.

Reference numeral 43 is a wave detector, and this wave detector 43 is
It detects the transmission power from the output of the transmission power amplifier 42 and detects the absence of input to the transmission unit, and is configured by using a diode. 44 is a transmission power control unit,
This transmission power control unit 44 is an OP amplifier (operational amplifier).
When there is an input to the transmission section, the detection output of the detector 43 is amplified, and the attenuation amount of the transmission power in the voltage variable attenuator 41 is adjusted to transmit the signal. The power is controlled to be kept constant.

Reference numeral 45 denotes a switch, and this switch 45
Is connected to the transmission power control unit 44 when there is an input to the transmission unit, and is connected to the constant pressure power supply 46 when there is no input to the transmission unit. With such a configuration, the following operation is performed. First, if there is an input to the transmitter,
The switch 45 is connected to the transmission power control unit 44. The input transmission signal has its transmission power increased or decreased by the output of the transmission power control unit 44 in the voltage variable attenuator 41. Then, the transmission power amplifier 42 amplifies the transmission power and outputs it.

At this time, the detector 43 operates the transmission power amplifier 4
Seeing the output of 2, the detection output is transmitted to the transmission power control unit 44, and the transmission power control unit 44 amplifies the detection output and transmits it to the voltage variable attenuator 41. The transmission power output by the above operation is fed back, so that the transmission power is controlled to be constant, that is, the detection output of the detector 43 is controlled to be constant.

However, in the case where voice transmission is performed only when there is a voice input and the carrier transmission is stopped at other times, including the silent period, the input to the transmission section is performed in normal operation. Disappears. This is the same as when the output power is simply reduced in the control unit, and the transmission power control diverges in the direction of increasing the output power.

However, when the output power diverges in an increasing direction, the next input causes an over-output, which causes a problem not only in actual operation but also in law, so that the power detected by the detector 43 is constant. When the value falls below the value, it is considered that the input is lost, and the following control is performed. That is, the detection unit 4
When it is detected in 3 that there is no input to the transmitter, the switch 45 is connected to the constant pressure power source 46. By this operation, the output power can be set to the minimum value.

[0011]

However, in such a conventional transmission power control device, the carrier is turned on in a short time such as when there is no sound in voice activation.
Even if the output is turned off, that is, the presence / absence of the input is switched in a short time, the output power is set to the minimum value, and when the output power is changed from no input to present, the power control is restarted, so There is a problem that the output power cannot be converged, and thus it is not possible to follow a signal with a short cycle.

The present invention has been made in view of the above problems, and provides a transmission power control device capable of shortening the convergence time to a specified output power and tracking a signal with a short cycle. The purpose is to

[0013]

FIG. 1 is a block diagram of the principle of the present invention. In FIG. 1, reference numeral 1 is a transmission power amplifying means, and the transmission power amplifying means 1 is provided in a transmission section and has a transmission power. For amplifying. Reference numeral 2 is a transmission power detection means, and this transmission power detection means 2 detects the transmission power from the output of the transmission power amplification means 1.

Reference numeral 3 is a first transmission power control means, and based on the detection result of the transmission power detection means 2, the first transmission power control means 3 controls the transmission power so that the output of the transmission power amplification means 1 becomes constant. To control. Reference numeral 4 is a temperature detecting means, and this temperature detecting means 4 detects the temperature of the transmitting section.

Reference numeral 5 is a second transmission power control means, and this second transmission power control means 5 has priority over the control by the first transmission power control means 3 when there is no signal input to the transmission section. The transmission power is controlled based on the detection result of the temperature detecting means 4. The second transmission power control means 5
The transmission power control by may be over-controlled in the direction of suppressing the transmission power.

[0016]

In the above-described transmission power control apparatus of the present invention, the input transmission signal is amplified in transmission power by the transmission power amplifying means 1 and output, but the transmission power detecting means 2 operates in the transmission power amplifying means 1. The transmission power is detected from the output, and based on the detection result, the first transmission power control means 3 controls the transmission power so that the output of the transmission power amplifier 1 becomes constant.

When there is no signal input to the transmitter, the second transmission is performed based on the detection result of the temperature detector 4 for detecting the temperature of the transmitter, prior to the control by the first transmission power controller 3. The power control means 5 controls the transmission power. The transmission power control by the second transmission power control means 5 can be over-controlled in the direction of suppressing the transmission power.

[0018]

Embodiments of the present invention will be described below with reference to the drawings. 2 is a block diagram showing an embodiment of the present invention. In FIG. 2, reference numeral 21 is a transmission power amplifying means, which is for amplifying the transmission power. The voltage variable attenuator 26, 27 and the amplifier 28 which will be described are included.

Here, the voltage variable attenuators 26 and 27 increase / decrease the transmission power by the control outputs of the second transmission power control means 25 and the first transmission power control means 23, respectively, and the amplifier 28 operates. It is a high frequency amplifier configured using transistors and FETs. Reference numeral 22 denotes a wave detector, and this wave detector 22 is transmission power detection means for detecting transmission power from the output of the transmission power amplification means 21, and a diode is used in the configuration. In addition, this detector 22
In the above, the absence of input to the transmitter is also detected using the detection result of the transmission power, but this function may be provided separately.

Reference numeral 23 is a first transmission power control means, and this first transmission power control means 23 controls the transmission power so that the output of the transmission power amplification means 21 becomes constant based on the detection result of the detector 22. And is composed of an OP amplifier and a resistor. Reference numeral 24 is a temperature detector, and this temperature detector 24 detects the temperature of the transmitter, and a thermistor is used.

Reference numeral 25 is a second transmission power control means. This second transmission power control means 25 is composed of an OP amplifier and a resistor, and when there is no signal input to the transmission section, the first transmission power control means 25 is provided. Prior to the control by the control means 23,
Although the transmission power is controlled based on the detection result of the temperature detector 24, the control of the transmission power is set so as to overcontrol in the direction of decreasing the transmission power.

This configuration is an example, and the element used is not limited to this as long as the same operation can be performed. Further, the method and configuration for changing the transmission power are not limited to this. In addition, in the present embodiment, if there is an input to the transmission unit, A
Although it is controlled by LC, it may be controlled by AGC or may be controlled by using both ALC and AGC. When the ALC and the AGC are used together as described above, the control accuracy does not change. However, by doing so, the control range (dynamic range) of the ALC or AGC can be reduced.

With the above structure, the following operation is performed. First, when there is an input to the transmission section, the input transmission signal has its transmission power increased or decreased by the voltage variable attenuators 26 and 27 in the transmission power amplification means 21, and the amplifier 28 is used.
The transmission power is amplified and output by the detector 22.
Detects the transmission output from the output of the transmission power amplification means 21,
The first transmission power control means 23 amplifies the detection output of the detector 22, and receives the output, and the voltage variable attenuator 27.
By controlling the attenuation amount of the transmission power in the above, the detection output of the detector 22 is adjusted to be constant, that is, the transmission power is adjusted to be constant.

On the other hand, when the power detected by the detector 22 is lower than a certain value, it is determined that there is no input to the transmission unit, the control by the first transmission power control means 23 becomes invalid, and the 2 The transmission power control means 25 becomes effective.
The second transmission power control means 25 amplifies and outputs the detection result of the temperature detector 24, and outputs the voltage variable attenuator 26.
Over-controls the amount of attenuation of the transmission power in the direction of decreasing the transmission power.

By the above operation, the transmission output (gain of the transmission unit) is adjusted even when there is no input to the transmission unit, and the amount of change until convergence is small even when there is an input again. It is possible to converge in a short time. Further, since the control of the transmission power by the second transmission power control means 25 is over-controlled in the direction of decreasing the transmission power,
When the input to the transmission unit becomes available again, the transmission power is always slightly lower than the specified value, and it is possible to solve the problem of operational or legal over-output.

FIG. 3 is a diagram for explaining the operation of this embodiment. That is, in FIG. 3, when the first input is present (refer to the section A), the transmission power is controlled to the specified value by the detector 22 and the first transmission power control means 23, and thereafter there is no input (section B). (Refer to FIG. 3), the temperature detector 24 and the second transmission power control means 25 control the transmission power so that the transmission power is slightly below the specified value, and the state returns to the state of input (see section C) again. And the detector 2
2. Returning to the control by the first transmission power control means 23, it can be seen that at this time, the transmission power quickly returns to the specified value. In FIG. 3, the dotted line characteristic is the characteristic of the conventional device shown in FIG. 4, but when there is no input (see section B), the transmission power is at the minimum value, so there is input again (section C). When returning to the state of (see), it is understood that the return of the transmission power to the specified value is slow.

[0027]

As described above in detail, according to the transmission power control apparatus of the present invention (claim 1), when there is no signal input to the transmission unit, the control by the first transmission power control means is performed. Since the transmission power is preferentially controlled based on the detection result of the temperature detecting means, it is possible to converge to the specified output power in a short time when there is no input from the input again, and the transmission power control is performed. It greatly contributes to the performance improvement of the method.

Further, according to the transmission power control device of the present invention (claim 2), the input power is again input by over-controlling the transmission power control when there is no input in the direction of decreasing the transmission power. In this case, since the transmission power is set to be slightly lower than the specified value, there is an advantage that it is possible to solve the problem of operational or legal overoutput.

[Brief description of drawings]

FIG. 1 is a principle block diagram of the present invention.

FIG. 2 is a block diagram showing an embodiment of the present invention.

FIG. 3 is an explanatory view of the operation of the embodiment of the present invention.

FIG. 4 is a block diagram showing a conventional example.

[Explanation of symbols]

 1,21 Transmission power amplification means 2 Transmission power detection means 3,23 First transmission power control means 4 Temperature detection means 5,25 Second transmission power control means 22,43 Detector 24 Temperature detector 26,27,41 Voltage variable Attenuator 28 Amplifier 42 Transmission power amplifier 44 Transmission power control unit 45 Switch 46 Constant voltage power supply

Claims (2)

[Claims] 1. A transmission power amplification means (1) provided in a transmission section for amplifying transmission power, and a transmission power detection means (2) for detecting transmission power from an output of the transmission power amplification means (1). And a first transmission power control means (3) for controlling the transmission power so that the output of the transmission power amplification means (1) becomes constant based on the detection result of the transmission power detection means (2). When there is no signal input to the temperature detecting means (4) for detecting the temperature of the transmitter, the temperature detecting means (4) has priority over the control by the first transmission power control means (3). Second, which controls the transmission power based on the detection result of 4)
A transmission power control device comprising a transmission power control means (5). 2. The transmission power control device according to claim 1, wherein the transmission power control by the second transmission power control means (5) is over-controlled in the direction of suppressing the transmission power.