JPH04326211A - Thermal protection system for ratio communication equipment - Google Patents

Abstract

PURPOSE:To enable transmission in a short time when emergency communication is required by driving a timer to limit time for transmission to fixed time in response to a limit signal and raising an alarm of transmission limit. CONSTITUTION:This system is composed of a communication equipment 1, microcomputer 2 to control the communication equipment 1 and temperature sensor 3 to detect the temperature of a radiator 4 fitted to the transmission power amplification part of the communication equipment 1. A limit signal generating means is provided to generate the limit signal when the output of the temperature sensor 3 exceeds a first reference value Tu, and a transmission limit timer means is provided to raise the alarm of the transmission limit by detecting the existence of the limit signal and driving the timer to control the time for transmission to the fixed time when there is the limit signal. Even when the output of the temperature sensor 3 excees the first reference value Tu, transmission is enabled during the time set by the transmission limit timer. Therefore, the transmission is enabled within the timer time even untial use is enabled after a temperature is lowered from a transmission stop state caused by the temperature increase of the communication equipment 1.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for controlling a transmission operation in a wireless communication device according to heat generated during transmission.

0002

[Prior Art] Conventionally, when communicating with a wireless communication device,
If you transmit continuously or intermittently for a long time,
The transmission power amplification section of a wireless communication device may reach a very high temperature even if a radiator is attached. Furthermore, recent wireless communication devices have become more compact, and a problem has arisen in that only small radiators can be used due to their shapes. In other words, even if the transmission output is the same, due to the smaller shape and radiator, if the transmission continues for a long time, the radio communication equipment may be damaged due to poor heat dissipation efficiency, and the operator may suffer dangerous injuries such as burns from the heat. Sometimes we meet. Therefore, there has been a method of detecting the temperature of the radiator using a temperature sensor, comparing it with a reference value, and restricting transmission according to the comparison.

FIG. 3 is a diagram showing temperature and transmission limits. The reference temperature used in the conventional method is the first reference value T.
This first reference value Tu is compared with the output of the temperature sensor.
If the limit was exceeded, transmission would be stopped or the transmission output would be reduced. This is a method in which normal communication can be performed when the temperature drops by stopping transmission or reducing the transmission output and becomes below the second reference value TL. Therefore, if the temperature rises above the first reference value Tu, it will take time for the temperature to drop to the second reference value TL even if transmission is restricted, and even if an emergency call occurs during that time, communication may not be possible or the transmission output may be reduced. In some cases, the communication distance becomes short, which is an inconvenience.

0004

[Problems to be Solved by the Invention] According to the present invention, transmission is restricted when the detected value of the temperature sensor exceeds the first reference value Tu, which was done in the conventional technology, and emergency communication is not possible in this state. Ta. In order to solve this problem, it is an object of the present invention to provide a thermal protection system for a wireless communication device that allows transmission for a very short time even when the temperature value detected by the temperature sensor exceeds the first reference value Tu.

[0005]

[Means for Solving the Problems] A microcomputer-controlled wireless communication device or wireless transmitter equipped with a temperature sensor, which generates a limit signal when the output of the temperature sensor exceeds a first reference value Tu. and a transmission limit timer means that detects the presence or absence of a limit signal and, if there is a limit signal, drives a timer that limits the transmission time to a fixed time and issues a transmission limit warning, and the output of the temperature sensor is a first reference. value T
This method allows transmission for the time set by the transmission limit timer even if the transmission limit exceeds u.

[0006]

[Operation] When the PTT switch of the wireless communication device is turned on, the temperature of the transmission power amplification section rises, and the heat radiation from the heat sink is no longer enough, and the heat sink becomes abnormally high temperature. When the output detected by the temperature sensor attached there increases and exceeds the first reference value Tu, a transmission restriction timer is set and a transmission restriction warning sound is output. Therefore, transmission is possible only for the time set by the timer. Once the time has elapsed and a timeout occurs, the transmission state is automatically stopped. When the temperature rises further and exceeds an arbitrarily set third reference value TH, transmission is completely stopped. Due to the transmission restriction, the temperature decreases until it reaches the second reference value TL, but the transmission is restricted until the second reference value T.
When the value is below L, normal transmission becomes possible.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a block diagram showing the main parts of an embodiment of the present invention. In the figure, a communication device (or transmitter) 1,
It consists of a microcomputer 2 that controls the communication device 1 and a temperature sensor 3 that detects the temperature of a radiator 4 attached to the transmission power amplification section of the communication device 1.

In the transmission operation with the above configuration, when the PTT switch is pressed, the microcomputer 2 transmits the transmission control Tx.
A signal is output and transmitted from the communication device 1. While the transmission time is short, the temperature generated by the communication device does not rise that much, but if the communication becomes long and the transmission time increases, the heat dissipation of the radiator will no longer be able to cope with the increase, and the temperature will rise. Therefore, the temperature sensor 3, in the embodiment, a temperature sensing element such as a thermistor, is used and its detected value is read into the microcomputer 2. This read detection value is compared in size with three reference values stored in the memory of the microcomputer 2, and a control signal is output in accordance with the comparison. The first reference value Tu limits transmission when the temperature of the wireless communication device 1 gradually rises in the transmitting state, the detected value of the temperature sensor 3 rises, and the value taken into the microcomputer 2 exceeds the first reference value Tu. This is the standard value for restrictions to be added. The second reference value TL, which is set to the first reference value Tu or lower, is set to 1. When the heat generation of the communication device 1, which has been restricted in transmission due to a rise in temperature, stops, the temperature decreases, and when the temperature drops to the second reference value TL, normal transmission is possible. This is the reference value for restoring to the state.

The third reference value TH in FIG. 3 is a new reference value provided by the present invention, and is appropriately set as necessary between the first reference value Tu and infinity. This is a reference value that forcibly stops transmission when the third reference value TH is exceeded. The above-mentioned transmission restriction includes a transmission restriction timer set that limits the transmission time, and a transmission restriction timer means that emits a transmission restriction warning sound.

Next, the operation of the present invention will be explained according to the flowchart shown in FIG. When the communication device enters the operating state by START 10 and turns on the PTT switch, the value detected by the temperature sensor 3 is compared with the value detected by the temperature sensor 3 through the judgment boxes 11, 12, 15, and 16, and if it is smaller than the second reference value TL, the transmission control signal Tx is activated. It is output to transmitter 1 and enters the transmitting state. If the transmission state continues for a long time and the output level of the temperature sensor 3 rises and is between the first reference value Tu and the second reference value TL, the control flag 1 is detected in the judgment box 20, and if it is off, the control flag 1 is transmitted as is. I can continue. This control flub 1
If there is, the limit will be set by the transmission limit timer. When the transmission state continues for a long time and the output of the temperature sensor 3 further increases and exceeds the first reference value Tu, the presence or absence of the control flag 1 is determined in the judgment box 24. If it is determined that there is no control flag 1, the judgment box 28
The presence or absence of the transmission control Tx signal is determined, and if it is determined that the signal is present, control flag 1 is turned on in process 29, and a transmission limit timer is set in process 30. In the present invention, the setting time is set to 10 seconds, but this setting time can be set as appropriate. Sets the transmission limit timer and outputs a warning sound. Transmission continues in this state, and when the transmission limit timer is counted in step 25 and a time-out is determined in decision box 26, the transmission control Tx signal is turned off in step 27 to stop the transmission. On the other hand, when the PTT switch is pressed while transmission is interrupted, the detection value of the temperature sensor 3 is determined to be greater than or equal to the first reference value Tu by the judgment box 15 or greater than the second reference value TL by the judgment box 16. Then, the decision box 21 determines whether the transmission control Tx is off or on, and if it is off, the transmission limit timer is set and a warning sound is output in steps 22 and 23, and then the transmission control Tx signal is output to set the time limit. enable certain transmissions. Further, if the temperature rise of the communication device is significantly increased and the detection value of the temperature sensor 3 is determined to be equal to or higher than the third reference value TH in the judgment box 12, the limit flag 2 is turned on in the process 32, and the transmission control Tx signal is turned on. Also, in step 34, Tx-1NH is turned on. That is, send (
Tx) Sets a prohibition state flag and transmits control Tx in process 27.
Turn off and stop sending.

From the above explanation, if there is a temperature rise in the initial transmission state, normal unlimited transmission is possible below the first reference value Tu, and the detected value of the temperature sensor between the first reference value Tu and the third reference value TH. If there is, a timer is set using the transmission limit timer means and a warning sound is output. Furthermore, when the temperature sensor detects a high temperature and exceeds the third reference value TH, transmission is completely stopped. When the temperature rise ends and the temperature begins to fall,
If the temperature sensor detects a value between the third reference value TH and the second reference value TL, the transmission limit timer means sets a timer and outputs a warning sound. Transmission can only be performed for the set timer time. When the temperature further decreases to below the second reference value TL, normal transmission becomes possible.

Although the present invention uses a thermistor as the temperature sensing element, the present invention is not limited to this, and it is also possible to use other temperature sensing elements such as a thermostat. Further, in the present invention, the control based on the temperature rise is such that the transmission is stopped, but a method of reducing the transmission output in order to suppress the temperature rise may also be used.

[0013]

Effects of the Invention The temperature-based transmission control method according to the present invention includes a transmission control timer means that enables transmission for a very short time even if the detected value of the temperature sensor exceeds the first reference value Tu, and warns the operator. By emitting a message and making it usable for the timer period, it is possible to transmit even if the wireless communication device stops transmitting due to a temperature rise until it becomes usable when the temperature drops, as long as it is within the timer period. This has the effect of guaranteeing time communication.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of a wireless communication device of the present invention.

FIG. 2 is a flowchart explaining the operation of the present invention.

FIGS. 3(a) and 3(b) are graphs showing the operation of the present invention and reference values; FIG. 3(b) shows the third reference value TH set to infinity;

[Explanation of symbols]

1 Communication device 2 Microcomputer 3 Temperature sensor 4 Heat sink 10 Start 11, 12, 14, 15, 16, 18, 20, 21, 2
4, 26, 28, 32 Judgment box 13, 17, 19, 22, 23, 25, 27, 29, 3
0, 31, 32, 34, 35 processing

Claims (1)

[Claims] 1. A microcomputer-controlled wireless communication device or wireless transmitter equipped with a temperature sensor, comprising a limit signal generating means for generating a limit signal when the output of the temperature sensor exceeds a reference value set as a desired value. , a transmission limit timer means for detecting the presence or absence of the limit signal, and driving a timer that limits the transmission time to a certain time when the limit signal is present to issue a transmission limit warning, the output of the temperature sensor being set to the reference level. A thermal protection method for a wireless communication device, which is characterized in that it enables transmission within a limited timer time even if a value exceeds a value.