JPS60182826A - Power supply momentary interruption processing system of radio communication equipment - Google Patents

Abstract

PURPOSE:To restart talking immediately after restoration of voltage by keeping a talking channel with a backup power supply even if a voltage applied to a radio section, a control section and a storage section of an automobile telephone set is decreased momentarily. CONSTITUTION:It is supporsed that a voltage of a power supply 103 is decreased below 10V due to any cause while an automobile telephone set is in talking via a base station, a detection circuit 201 detects it, a signal 0 is inputted to a CPU 501, a switch 605 of a radio equipment 6 is turned off and the talking with the fixed station is stopped. When the power supply voltage restores to a voltage over 10V, the switch 605 is turned on and the talking is restarted. When the input voltage of the control section 5 is 5V or below, the detection circuit 505 inputs a signal 0 to the CPU501 to hold the CPU1 in holding state and W/R of RAM502, 503 is stopped, a voltage of a capacitor 504 is applied and the storage of the CPU501 and the RAM502 is kept. When the voltage is restored within a prescribed time, the talking is restarted by the stored channel. Thus, the talking is restarted easily.

Description

[Detailed description of the invention] [Technical field of invention] The present invention relates to a method for handling momentary power interruptions in wireless communication devices.

[Technical background of the invention]

There is a radio device that has a control section and a storage section that stores variable information related to the control, and controls the control section and the radio section based on the information stored in the storage section. . When the radio is driven by a required power source, particularly a battery, if a momentary power failure occurs, the operation of the radio is reset to its initial state.

FIG. 1 shows a block diagram of a car telephone device as an example of such a conventional radio device.

A car phone device can communicate with other car phone devices and general wired phone devices (hereinafter, both are collectively referred to as other phone devices) via a fixed station that has jurisdiction over multiple other car phone devices including the car phone device. ), one selected from the plurality of call channels assigned to the car telephone device in question.
In this device, the power supply voltage supplied from the power supply unit 1 is converted into an appropriate voltage by the voltage conversion unit 2, and the communication circuit unit 3, the display operation unit 4, and the control unit 5. , and added to the radio section 6.

For example, a power supply voltage of 13 [V] is supplied to the communication circuit section 3, a power supply voltage of 5 [V] is supplied to the display operation section 4 and the control section 5, and a power supply voltage of 10 [V] is supplied to the radio section 6. When making a call to another telephone device using such a car phone device, the selected call channel is notified to the fixed station via a control channel shared by multiple car phone devices under the jurisdiction of the fixed station, and the car phone Establish a telephone line between the device and the fixed station. Also, during a call, a tone signal with a frequency component outside the audio frequency band is constantly output to the call channel being used, and if the fixed station cannot receive the tone signal for a predetermined period of time, for example, 5 seconds or more, it will be forced to I'm trying to open up a call channel.

[Problems with background technology]

By the way, in a car telephone device having such a configuration,
For example, if you start your car engine while talking on a phone call, the voltage may drop temporarily and the power may be cut off.

Figure 2 shows this situation. The output voltage of the power supply section 1 has decreased by 10% compared to the rated output of 13.7 V [V].
When the voltage is below [V], the operation of the wireless section 6 becomes unstable.

However, in this case, if the voltage returns to 10[73] or more within 5 seconds, the normal state is immediately restored based on the information stored in the storage section 7 of the control section 5.

However, when the output voltage of the power supply section 1 becomes 5 [V] or less, the control section 5 is reset to the initial state, and the variable information necessary for establishing a telephone line stored in the storage section 7 of the control section 5, that is, other telephone equipment. 's phone number disappears. In this case, the operator must enter the phone number again. Then, the communication channel must be determined again using the control channel. However, such an operation is not desirable since it causes a decrease in channel utilization efficiency and a deterioration in service.

[Purpose of the invention]

The present invention has been made in view of the above-mentioned circumstances, and an object of the present invention is to provide a method for handling instantaneous power supply interruption that allows easy recovery even if a momentary interruption occurs in the power supply voltage.

[Summary of the invention]

Therefore, in the present invention, the power supply voltage applied to the control section and the storage section is monitored, and when the power supply voltage drops below a predetermined voltage, the control section is put into a hold state, and the control section and the storage section are held for a predetermined period of time. Means for backing up the voltage applied to K is provided, and when the power supply voltage is restored, K performs a predetermined restoration operation based on the contents stored in the storage section.

[Embodiments of the invention]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a block circuit diagram of a car telephone device e, which describes embodiments of the present invention in detail with reference to the accompanying drawings, is shown. In addition, in FIG. 3, the same function 1 as in FIG. The same reference numerals are given to the parts that serve the same purpose. The car telephone device of this embodiment is composed of a power supply section 1, a voltage conversion section 2, a communication circuit section 3, a display operation section 4, a control section 5, and a radio section 6.

The power supply unit 1 is formed of a thin transistor 102' which turns on and off in response to the on/off of the power switch 101. When the power switch 101 is turned on, the transistor 102 is turned on and the battery 103 is turned on. 13.7
A power supply voltage of V[vl is applied to the voltage converter 2.

The voltage conversion unit 2 includes a voltage detection circuit 201 that monitors the output voltage of the power supply unit 1, and three regulators 202, 203,
204.

The voltage detection circuit 201 is configured as shown in FIG. 4, and a voltage obtained by dividing the output voltage of the power supply section 1 by a voltage dividing circuit consisting of resistors 207 and 208 is applied to the inverting input terminal of the comparator 205. A reference voltage formed by a resistor 209 and a Zener diode 210 is applied to the non-inverting input terminal, and when the input voltage is 10 [73 or more], a signal "1" is given, and when it is less than 10 [V], a signal "1" is given. The signal "0#" is output to the control circuit 5, which will be described later.The regulators 202, 203, and 204 are connected to the output voltages 't13.7 [V], 5 [V], and 10 [V] of the power supply section 1. The signal is converted and outputted to the communication circuit section 3, display/operation section 4, control section 5, and radio section 6, respectively.

The communication circuit section 3 is a handset equipped with a transmitter and a receiver;
It consists of a headset that allows the operator to make and receive calls without having to hold the handset, a transmitting circuit, an amplifying circuit, a sidetone circuit (not shown), etc., and can communicate with other telephones like a regular telephone. You can now make calls. That is, the call signal output from the call circuit section 3 is transmitted to a fixed station (not shown) via the control section 5 and the radio section 6, and the call signal transmitted from the fixed station is received by the radio section 6 and sent to the control section 6. The signal is input to the telephone call circuit section 3 via the telephone line 5, and a telephone call is thereby started.

The display/operation section 4 is used to display the status of the car telephone device and also to establish a line with other telephone devices, and a detailed circuit diagram is shown in FIG. In FIG. 5, a central processing unit (hereinafter abbreviated as CPU) 401 controls the operation of the display/operation unit 4, and a light emitting diode 402 is controlled by the CPU 401 to change the state of the mobile phone device, For example, information such as call status, call received while the user is away, headset usage status, and being out of range of a fixed station are displayed. In addition, the CPU 401 has a pushbutane dial 40.
When the telephone number of another telephone device, that is, dial data is input by pressing 3, the dial data is stored in read/write memory (hereinafter abbreviated as RAM) 404,
The driver 405 is controlled to display the dial data on the liquid crystal display 406 and further output to the control section 5.

The control unit 5 performs all operational control of the entire car phone device, and includes a CPU 501, a RAM 502, and a RAM 50.
3 and peripheral circuits, and uses the output voltage of the voltage converter 2 as a main power source.

When the dial data is output from the display/operation section 4, the CPU 501 stores it in the iRAM 502, and controls the entire radio section 6 to establish a telephone line with the fixed station. That is, the CPU 501 outputs all data corresponding to an arbitrary communication channel, that is, a channel designation signal, to the frequency synthesizer 601 that constitutes all the local oscillators, outputs a local heating signal from the frequency synthesizer 601 to the receiving circuit 602, and the receiving circuit 602 outputs a local heating signal. When the electric field strength of one received communication channel is below a certain value, that communication channel is selected as the communication channel with the fixed station. Then, store the selected call channel in RAM.
502, and broadcast the selected communication channel to all fixed stations via the control channel to establish a communication line. Note that a call between the mobile phone device and a fixed station is transmitted from a call signal output circuit 603 outputted from the call circuit section 3 via an antenna duplexer 604, a high frequency switch 605, and an antenna 606, and A call signal transmitted from the station is received by the receiving circuit 602 via the antenna 606, the high frequency switch 605, and the antenna duplexer 604, and is output to the call circuit section 3. Further, the voltage detection circuit 505 of the control section 5 has the same circuit configuration as the voltage detection circuit 201, and when the input voltage of the control circuit 5 is larger than 5 [V], a signal "1#" is sent, and when it is smaller, a signal "1#" is sent. Output “0” to the CPU 501.

Further, the battery 506 is a backup power source for the RAM 503 that stores data necessary for establishing a call line based on speed dial operation, and even when the power switch 101 is opened, the memory of the RAM 503 is It retains its contents.

Note that the diodes 507 to 510 are provided to prevent backflow.

Next, the operation of the car telephone device when the output voltage of the power supply unit 1 is momentarily interrupted will be explained.

First, due to a momentary interruption of the power supply section 1, its output voltage is 10 CV.
), the voltage detection circuit 201 outputs a signal "0#" to the CPU 501 of the control unit 5, and the CPU 50
1 turns off the high frequency switch 605 so that communication signals are not transmitted or received with the fixed station. Note that the high frequency amplification circuit of the receiving circuit 602 and the high frequency amplifying circuit of the transmitting circuit 603 may be made inoperable without providing the high frequency switch 605. In addition, the CPU 501
When the output voltage returns to 10 (:V) or more, the high frequency switch 605t is turned on again.

Next, when the input voltage of the control unit 50 becomes 5 [V] or less, a signal "0" is output from the voltage detection circuit 505 to the CPU 501, and the CPU 1 enters a hold state where execution of instructions is temporarily stopped. No data is read from or written to 502 or 503. In this state, CPU 501
and the voltage applied to RAM 502 are held by capacitor 504, so that the CPU
501 and RAM 502 are never reset.

When the input voltage returns to 5 [v] or higher, the CPU 501
performs a return operation based on the information stored in RAM 502. That is, the CPU 501 uses the RAM 50
The display of the favorite display operation section 4 is restored based on the communication channel designation signal stored in the communication channel 2, the communication channel is outputted to the radio section 6, and the state before the voltage drop is restored.

FIG. 6 is a diagram showing changes in the voltage applied to the CPU 501 and the RAM 502 when the input voltage of the control section 5 becomes 5 [V] or less. The input voltage of the control unit 5 decreases at t. If it is west of the second (see Figure 6(,)), the CPU 501 and RAM 45 are connected by the capacitor 504.
02 is not smaller than the voltage V' [V] at which the radio is reset to its initial state, the contents of the memory of the CPU 501 and the RAM 502 are not reset (6th Figure (see b).

Note that the time t0 during which the CPU 501 and the RAM 502 can be backed up by the capacitor 504 is determined by the capacitance of the capacitor 504.

〔Effect of the invention〕

As described above, according to the present invention, the output voltage of the power supply unit and the input voltage of the control unit are detected to control the operation of the radio unit and the control unit, and the operation of the radio unit and the control unit is controlled for a predetermined period even after a momentary power interruption. By compensating the power supply to the control unit, it is possible to prevent the car telephone device from becoming unstable.

[Brief explanation of drawings]

Figure 1 is a block diagram of a conventional car telephone device;
The figure is an explanatory diagram showing how the output voltage of the power supply circuit of the automobile telephone device shown in FIG. FIG. 4 is a circuit diagram of the voltage detection circuit of the automobile telephone device shown in FIG. 3, and FIG. 5 is a circuit diagram of the display operation circuit of the automobile telephone device shown in FIG. 3. , FIG. 6 is a diagram showing voltage changes in various parts as the input voltage of the flFII control part decreases. DESCRIPTION OF SYMBOLS 1... Power supply part, 2... Voltage conversion part, 3... Call circuit part, 4... Display operation part, 5... Control part, 6...
Radio section, 7... Storage section, 201, 505... Voltage detection circuit, 504... Capacitor as backup power supply, 6o5... High frequency switch. Figure 6

Claims (3)

[Claims] (1) a wireless section; a control section that controls the operation of the wireless section;
A power interruption processing method for a wireless communication device, comprising at least a storage section that stores variable information related to control of the control section, and a power source that applies a predetermined voltage to the radio section, the control section, and the storage section. In this step, a voltage applied from the power supply to the control unit and the storage unit is monitored, and when the voltage falls below a predetermined voltage, a predetermined voltage is applied to the control unit and the storage unit for at least a predetermined period. After the voltage applied from the power source is restored, the control section is configured to:
1. A power interruption processing method for a wireless communication device, characterized in that a predetermined recovery operation is performed based on variable information stored in the storage section. (2) The variable information is at least communication channel information indicating a communication channel, and the return operation is at least an operation of returning to a communication channel corresponding to the communication channel information. Method for handling instantaneous power interruption of wireless communication equipment as described in . (3) The wireless communication according to claim (1), wherein the variable information is at least display information regarding the communication partner station, and the return operation is at least a display return operation based on the display information. Machine power interruption handling method.