JPS6253548A - Power consumption reduction device for communication system - Google Patents

Abstract

PURPOSE:To reduce power consumption by providing a reception means receiving a transmission signal from a transmission system and a discriminating means whether or not a received signal is a transmission signal. CONSTITUTION:When the execution of a program is started, whether or not a reception exists is discriminated, and when no reception signal exists, the 1st power circuit 26a applies the intermission turned on for a time T1 and turned off for a time T2. When the presence of the reception signal is discriminated, a code of the reception signal is read. When a signal from a transmitter other than a transmitter 1 or a radio wave noise between times t1-t2, since it is discriminated that no code signal is included in the reception signal, the on/off interruption of the 1st power supply circuit 26a continues. When a transmission signal from the transmitter 1 is received between times t3-t4, the 1st power supply circuit 26a is turned on continuously between times t5-t6. Thus, the power consumption of the reception system is reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a device for reducing the power consumption of a receiving system while waiting for a transmission signal from a transmitting system. It can be used with various remote control devices, such as wireless door lock control devices.

[Conventional technology]

Conventionally, communication devices such as transceivers have had to be powered on during standby in order to monitor whether there are transmission signals from other transmitters.

However, if the power is left on continuously, power will be consumed in the receiving circuit even though no communication is actually performed, and if a battery is used as a power source, the battery will run out. It promotes wear and tear.

Therefore, in the past, the power consumption of the device was reduced by periodically turning the power supply on and off at a predetermined duty ratio during standby, and keeping the power supply on continuously from the time the transmission signal was input. There is.

[Problem that the invention seeks to solve]

However, with conventional devices, signals other than the intended transmission signal, such as radio waves of the same frequency used for other communications, are transmitted.
Even when a signal such as a noise radio wave due to lightning or the like is received, the power supply remains on continuously, resulting in an increase in power consumption.

The present invention was made to solve the above problems, and
The purpose of the present invention is to prevent the power supply from being continuously turned on when a signal other than the intended transmission signal is input during a standby state.

[Means for solving problems]

Therefore, in order to achieve the above object, the present invention provides a power consumption reduction device for a communication system having a power control means for periodically turning on and off the power of the receiving system until receiving a transmission signal from the transmitting system. The power supply control means includes: a receiving unit that receives a transmission signal from the transmission system; and a determination unit that determines whether the reception signal received by the reception unit is the transmission signal; After receiving the judgment result of the judgment means,
When it is determined that the received signal is not the transmitted signal,
A technical means is adopted in which the power source is configured to maintain periodic on/off operation.

〔Example〕

The present invention will be explained in detail below based on embodiments shown in the drawings.

FIG. 1 shows an embodiment in which the present invention is applied to a wireless door lock control system for a vehicle. This system has a small transmitter 1 that can be carried by the driver, a receiver 2 mounted on the car, and a door locking system that has a solenoid 3 for locking and unlocking the door. 1'lI device 4. The transmitter 1 includes an oscillation circuit 10, a modulation circuit 11,
It is composed of an amplifier circuit 12, a code generation circuit 13, and a transmitting antenna 14. The code generation circuit 13 generates a code unique to this transmitter 1 indicating that the transmitted signal is from this transmitter l. And modulation circuit 11
modulates the signal output from the oscillation circuit 10 based on the code output from the code generation circuit 13, and this modulated signal is amplified by the amplifier circuit 12 and radiated from the transmitting antenna 14.

Next, the configuration of the door rotor control device 4 will be explained.

The receiver 2 includes a receiving circuit 22 that receives a signal incident on a receiving antenna 21, and the received signal received here is sent to a received signal detection circuit 23 and converted into a digital signal according to the signal. Microcomputer 24
is input. The microcomputer 24 determines whether the received signal is a signal from the transmitter 1 based on a control program to be described later, and generates an output signal to the solenoid drive circuit 25 and power supply circuit 26.

The solenoid drive circuit 25 is a microcomputer 24
When the door is locked, a forward current is applied to the door lock solenoid 3 to unlock the door, and when the door is unlocked, a reverse current is applied to the door lock solenoid 3. It is configured to flush and lock the door.

The power supply circuit 26 is connected to an on-vehicle battery 27, and includes a first power supply circuit 26a that supplies the receiving circuit 22 and a second power supply circuit 2 that backs up the microcomputer 24.
6b.

Next, the operation of this embodiment having the above configuration will be explained using FIGS. 2 to 4.

FIG. 2 shows a flowchart of the control program of the microcomputer 24, and the microcomputer 24 executes the control program of steps 100-160. When the program starts running, step 110
If there is no received signal, proceed to step 160 to determine whether there is a received signal, and if there is no received signal, proceed to step 160 and
As shown in the figure, the first power supply circuit 26a performs an intermittent operation in which it is turned on for a time T1 (for example, 0.1 seconds) and turned off for a time T2 (for example, 0.5 seconds). If it is determined in step 110 that there is a received signal, the process proceeds to step 120 to read the code of the received signal, and the process proceeds to step 130.

In step 130, it is determined whether the received signal includes a code indicating that there is a transmitted signal from the transmitter m1.

Here, between times t1 and t2 shown in FIG.
If a transmitting device other than the above or radio wave noise is received, it is determined in step 130 that the received signal does not include the above-mentioned code signal, so step 160 is performed.
Then, the on/off intermittent operation of the first power supply circuit 26a is continued.

Further, when the transmission signal from the transmitter 1 is received between times t3 and t in FIG. 4, the process proceeds to step 140 and the first
The power supply circuit 26a is continuously turned on from time t5 to time t6. Furthermore, step 150 is performed by the solenoid drive circuit 25.
is activated, and Na flows into the door lock solenoid 3.

In addition, in FIGS. 3 and 4, waveform diagrams 3A and 4A show the waveform of the output signal S1 of the receiving circuit 22, and 3B
, 4B show the waveform of the output signal S2 of the first power supply circuit 26a.

In the above embodiment, the present invention is applied to a wireless door rotor control device for a vehicle, but the present invention is not limited to the above embodiment, and can be applied to various remote control devices and communication systems. Applicable.

In addition, the signals used for communication are not limited to radio waves, but also ultrasonic waves,
Light or the like may be used as the signal.

〔Effect of the invention〕

As described above, according to the present invention, if a signal other than the intended transmission signal is received while the reception means is waiting for a transmission signal, the reception system is not kept in a continuous on state. This has the effect that power consumption can be effectively reduced.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the overall configuration of the present invention, FIG. 2 is a flowchart of the microcomputer shown in FIG. 1,
3 and 4 are waveform diagrams of various parts of the receiver shown in FIG. 1. l...Transmitter, 2...Receiver, 22...Reception circuit, 24...Microcomputer, 26...Power supply circuit. Representative Patent Attorney Takashi Okabe A1%7 Figure 1

Claims (1)

[Scope of Claims] A power consumption reduction device for a communication system having a power control means for periodically turning on and off the power of the receiving system until receiving a transmission signal from the transmitting system, comprising: The power control means includes a receiving means for receiving a transmitted signal, and a determining means for determining whether the received signal received by the receiving means is the transmitted signal, and the power supply control means receives the determination result of the determining means. ,
A power consumption reduction device for a communication system, characterized in that the device is configured to maintain periodic on/off operation of the power source when it is determined that the received signal is not the transmitted signal.