JPH0358507A - High frequency power amplifier protection circuit - Google Patents

Abstract

PURPOSE:To attain continuous communication while protecting a high frequency power amplifier from burning due to heat by providing a logic output section sending a control signal decreasing transmission power to the high frequency power amplifier so as to reduce the transmission power. CONSTITUTION:A transmission part 1 is provided with a temperature sensor 12 sensing a temperature of a high frequency power amplifier 11, a comparator circuit 22 of a logic control section 2 compares a temperature data set by a temperature setting circuit 21 with the detected temperature data and gives an output when the detected temperature data exceeds the set temperature data and a logic output section 23 outputs a control signal to the high frequency power amplifier 11 by the output of the comparator circuit 22. Then the transmission power of the high frequency power amplifier 11 is reduced to prevent burning of the high frequency power amplifier 11. Thus, disabled communication due to interruption of power supply is avoided and continuous communication is attained while protecting the high frequency power amplifier 11.

Description

[Detailed Description of the Invention] [Summary] Regarding a protection circuit for monitoring the rise in temperature of a high frequency power amplifier in a transmitting section of a mobile communication terminal device, a device is provided which disconnects a lightning source section in response to a temperature rise in the high frequency power amplifier. The purpose is not to stop the transmission, but to lower the transmission power to protect the high frequency power transmitter from burnout due to heat, and to enable continuous communication.The purpose is to amplify the transmission input and increase the transmission output. a transmitter including a high frequency power amplifier that transmits the temperature, a temperature sensor that transmits detected temperature data obtained by monitoring the temperature of the high frequency power amplifier, a temperature setting circuit that outputs set temperature data, and a temperature setting circuit that outputs set temperature data; Comparing the waterlogging data and the detected temperature data,
a comparator that outputs a result that the detected temperature data exceeds the set temperature data; and the ratio IP! 17, t, which is provided with a logic output section that sends a control signal to reduce the transmission power to the high frequency power amplifier when the result of the 52 transmission is output;
Make it happen.

[Field of Application in Industry-12] The present invention relates to a 1'5 record keeping circuit for monitoring the temperature rise of a high-frequency power amplifier in a transmitting section of a mobile communication terminal.

(Technique of subordinate fruit) FIG. 5 is a diagram showing an example of a conventional circuit configuration.

In the first layer, 1 is a transmitting section consisting of a high frequency power amplifier 11 and a temperature sensor 12, 2 is a control section, 3 is a telephone, 4 is
5 is a synthesizer, 5 is a filter, 6 is an antenna, 7 is a receiving section, and 8 is a power supply section. The explanation will be given below using FIG. 5.

When the telephone 3 enters the talking state, the voice signal from the telephone 3 is input to the synthesizer 4, and the telephone 3 sends a press talk to the logic control unit 2 indicating that the telephone has been spoken. At this time, the logic control section 2 sends a logic signal to the synthesizer 4, modulation processing is performed on the carrier wave using the audio signal input from the telephone 3 to the synthesizer 4, and the obtained output is sent to the transmission section 1. As a result, the high I'rl wave 7ji of the transmitter 1 increases in power 1'iI7 2g +
+ is added to the output from the generator 4, and 'i
U 2+1', (main IJ based on the '1E source line of part 8
(Takaen's mental force is generated by receiving the sleeve 6: L, quality high frequency 'i'.4: The force passes through filter 5, and from antenna 6 to 5pjl ( ,?,.ji !Sent as waves.

On the other hand, in the case of reception, the received signal number input from the antenna (j) passes through the filter 5 to the receiving part 7, and then
In multiple al. I is processed and the logic control unit 2
After that, the call was picked up on heavy-duty machine 3.

When performing the above-mentioned transmission/reception operation, the 11k degree sensor l2 constantly monitors the /11k degree of the ri frequency travel force 1 width filter 11 and detects the detected 13 degree deku a. It is sent to the logic controller 2. If high-frequency power amplifier 11's number 7! Is it a logic system when it comes to 6 degrees outside the setting? The ffn section 2 detects this and sends a control signal -5j to the %A1 section 8, cutting off the power supplied from the power supply section 8 to the transmitting section 1 through the poison wire, making communication impossible. 1i
The bear was attacked by heat from the high-frequency power amplifier 11.
1 is fat.

That is, regardless of whether the device is communicating or not, the transmission is automatically stopped when the temperature of the high frequency power amplifier 11 falls outside a certain setting range. There is.

rProblems to be Solved by the Invention] Therefore, since the power supply section is cut off when the temperature of the device falls outside the set flooding range, emergency communications cannot be made or the function suddenly stops during communication. There was a problem that communication could not be restarted unless the temperature of the device fell within the set value range.

The present invention does not cut off the power supply section and stop the device in response to a rise in temperature of the high frequency power amplifier, but rather lowers the transmitting power to protect the high frequency power amplifier from burnout due to aging, while continuing communication. The purpose is to make it possible.

[Means to solve the problem]

FIG. 1 is a diagram showing the principle structure of the present invention.

In the figure, 1 is a transmitter 1 old part, which is obtained by monitoring the temperature of the high-frequency power amplifier 11 and the high-frequency power amplifier 11, which amplify the transmitting input from, for example, a poison talker and send out the transmitting output. Temperature sensor 1 that sends detected temperature data
2, and 2 is a logic/7k control unit, which outputs set temperature data. A degree data and iii+ +fL! A comparator 22 which compares the temperature data and outputs a comparison result when the test result data exceeds the set temperature data, and a high frequency signal when the comparison result is input. It is provided with a logic output section 23 that outputs a control signal for the electric power Doso width 3:411.

In this logic control unit 2, this 111f notation? ffl
When the l signal is input, the transmission of the high frequency power amplifier 11 {
The structure is such that thermal burnout of the high frequency power amplifier 11 is prevented by controlling the I'l'i'L power to lower it.

[For production]

As shown in FIG. 1 and FIG. 2C, if the temperature obtained by detecting the temperature of the high-frequency tE force amplifier 11 by the temperature sensor l2 exceeds a certain set temperature, Control from the logic control unit 2 to the high frequency power amplifier 11
The high frequency power amplifier 11 is prevented from being burnt by heat by transmitting a signal and controlling to lower the transmission power.

Therefore, it is possible to prevent communication from being disabled due to disconnection of the power supply section, making it possible to make emergency calls while preventing thermal burnout of the high frequency power amplifier 11.

〔Example〕

FIG. 3 is a diagram showing an example of the circuit configuration of the present invention. In the figure, 1 is a transmitting section consisting of a high frequency power amplifier 11 and a temperature sensor 12, 2 is a logic control Ill section, 3 is a lightning speaker, 4 is a synthesizer, 5 is a filter, 6 is an antenna, 7 is a receiving section, and 8 is a power supply Department. The operations for transmitting and receiving audio signals in the operations up to this point are the same as those in the conventional example shown in FIG. 5 described above.

In the present invention, the structure and control of the logic control section 2 are different from those of the conventional example, and the logic control section 2 is provided with a temperature setting circuit 21, a comparator 22, and a logic output section 23 to perform temperature control. I try to do it.

In FIG. 3, 13 is detected temperature data a from the temperature sensor l2, 21a is set temperature data b from the temperature setting circuit 21, and 22a is a temperature upper limit flag.

The operation of the temperature control 112 will be explained below using FIGS. 2 and 3.

■ Detection of 13 in which the temperature of the high frequency power amplifier 11 is monitored by the temperature sensor l2 and converted into a voltage value, 1. L
Degree data a is always ratio '19. is input to the device 22.

■ The taping temperature data b of 21a, which has been converted into a voltage by the temperature setting circuit 2l, is set to 21a,'. I! If the temperature is higher than the temperature data b, the comparator 22 sends a temperature-L rise flag 22a to the l-lower output unit 23.

■ Logic output section 2 that received the temperature rise flag 22a
3 sends out a control signal to the high-frequency power increaser 11 and sends out a warning signal to the telephone 3.

■ The high frequency power amplifier ■ 1 uses the control fffll signal to lower the input error and transmission power, and the telephone iso 3 uses the alarm 2l{g
Upon receiving the signal, the user is notified by a beep or a light emitting diode that the output power has been reduced because the temperature of the high frequency power amplifier 11 has exceeded the preset temperature.

Burnout of the high frequency power amplifier 11 is prevented with the transmitter/receiver circuit connected as described above.

FIG. 4 is a diagram showing another example of the UnJ path configuration of the present invention, and only the circuits of the transmitting section 1 and the logic control section 2 are described. The difference from Fig. 3 is that the high frequency power amplification rjr
11, the current value flowing from the power supply section 8 to the high frequency power amplifier 11 via the power supply line is detected and outputted by the current sensor 24, and is inputted to the comparator 22 together with the output of the temperature setting circuit 21. Accordingly, the temperature flag signal is sent to the logic output section 23, and the obtained control signal is used to monitor the power consumption of the high frequency power 1 width 2'&11.

[Effects of Hatsuri 1] From the above explanation, I! According to the present invention, the high frequency power amplifier of a mobile communication terminal device can be prevented from being burnt out due to heat without cutting off the lightning source.

Therefore, it is possible to communicate in an emergency, and there is an effect that communication can be performed while protecting the high frequency power amplifier, which will greatly contribute to the unbelievable improvement in the reliability of mobile communication.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the principle configuration of the present invention, FIG. 2 is a diagram showing the control flow of the present invention, FIG. 3 is a diagram showing an example of the circuit configuration of the present invention, and FIG. 4 is a diagram showing the circuit of the present invention. FIG. 5 is a diagram showing another example of the configuration, and FIG. 5 is a diagram showing an example of a conventional circuit configuration. In the figure, 1 is a transmitting section, 11 is a high frequency power amplifier, 12 is a temperature sensor, 2 is a logic system 1311 section, 21 is a temperature setting circuit, 22 is a comparator, 23 is a logic output section, 3 is a spirit talking device, and 6 is a Antenna, not shown. FIG. 1 shows the page structure of the present invention. FIG. 2 shows the control flow of the present invention. FIG. 3 shows an example of the circuit II of the present invention. FIG. 3 is another example of the circuit structure of the present invention. Figure 4 shows

Claims (1)

[Claims] A high frequency power amplifier (11) that amplifies a transmission input and sends out a transmission output, and a temperature sensor (11) that sends detected temperature data obtained by monitoring the temperature of the high frequency power amplifier (11). 12), a temperature setting circuit (21) that outputs set temperature data, and compares the set temperature data with the detected temperature data so that the detected temperature data is the set temperature data. A comparator (22) that outputs a result that exceeds the temperature data, and a logic output section (23) that sends a control signal to reduce the transmission power to the high frequency power amplifier (11) when the compared result is output.
A high frequency power amplifier protection circuit comprising: a logic control section (2) comprising; and a logic control section (2) comprising: