JPS62142424A - Powder consumption reducing device for receiving system - Google Patents

Abstract

PURPOSE:To reduce the power consumption by making on/off a receiving means periodically while waiting transmission signals. CONSTITUTION:The first power source circuit 26a makes an intermittent operation that turns on for T1 (for instance 0.05sec) and turns off for T2 (for instance 0.25sec), and judges whether there is a received signal or not during time T1 (time of power source on). When there is no receiving signal, the intermittent operation is continued, and when there is receiving signal, a code is read after continuing ON of the first power source circuit 26a. In the case where the reading of the code is completed, or the code is not sent in within a fixed time, the first power source circuit 26a is turned off.

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 applied to various remote control devices such as wireless door lock control devices for vehicles.

[Conventional technology]

Conventionally, in a transmitting device such as a transceiver, when waiting for a received signal, so-called standby, it has been necessary to keep the receiving circuit on in order to monitor whether there is a transmitted signal from another transmitter.

However, if the receiving circuit is kept on continuously,
Even though no communication is actually performed, power is consumed in the receiving circuit, and if a battery or the like is used as a power source, this will accelerate battery consumption.

Therefore, in the past, the receiver circuit was periodically turned on and off at a predetermined duty ratio during standby, and the receiver circuit was continuously turned on from the time the transmission signal was input to reduce the power consumption of the device. I have to.

[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 receiving circuit remains in a continuous ON state, resulting in an increase in power consumption.

The present invention was made to solve the above problems, and
The purpose is to prevent a receiving circuit from being continuously turned on even if a transmission signal is input.

[Means for solving problems]

Accordingly, in the present invention, in order to achieve the above object, as shown in FIG. , a reception power supply means M2 that periodically turns on and off the reception means M1 until the reception means M1 receives the transmission signal, and a reception power supply means M2 that periodically turns on and off the reception means M1 until the reception means M1 receives the transmission signal; , the receiving means M
.

A first command signal for turning on the receiving power supply means M2 is outputted to the receiving power supply means M2, and a second command signal for turning off the receiving means M upon detecting completion of reading of the discrimination code is output to the receiving power supply means M2. A technical means of providing a control means M3 for outputting to the receiving power supply means M2 is adopted.

〔Example〕

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

FIG. 2 shows an embodiment in which the present invention is applied to a wireless door lock control system for a vehicle. This system includes a small transmitter 1 that can be carried by the driver, a receiver 2 mounted on the vehicle, and a door lock control device 4 having a solenoid 3 for locking and unlocking the doors. The transmitter 1 includes an oscillation circuit 10, a modulation circuit 11, an amplification circuit 12, a code generation circuit 13, and a transmission antenna 14. The code generation circuit 13 is configured so that the transmission signal is
A code unique to this transmitter is generated indicating that it is from this transmitter l. The 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 transmission antenna 14. .

Next, the configuration of the door lock 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 transmission Ia1 based on a control program to be described later, and generates an output signal to the solenoid drive circuit 25 and the 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 power to the receiving circuit 22 and the received signal detection circuit 23, and a microcomputer 24.
and a second power supply circuit 26b that performs a bank amplification.

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

Waveform 4a in FIG. 4 shows the waveform of the input signal S1 to the receiving circuit 22, and 4B shows the waveform of the output signal S2 from the receiving circuit 22. FIG. 3 shows a flowchart of the control program of the microcomputer 24, and the microcomputer 24 executes the control program of steps 100-170. When the execution of the program starts, the process proceeds to step 110, and as shown in FIG. 4, the first power supply circuit 26
a is turned on for T + waiting time (e.g. 0.05 seconds), and T2 time (
For example, 0.25 seconds), the T
, standby time (power-on time), it is determined in step 120 whether or not there is a received signal.

If there is no received signal here, the process returns to step 110 and the intermittent operation continues. If it is determined in step 120 that there is a received signal, the process proceeds to step 130 and the first
After continuing to turn on the power supply circuit 26a, step 140
Load the code with
Or if the code is not sent within a certain amount of time,
Proceeding to step 150, the first power supply circuit 26a is turned off.

Through steps 130 to 150, the on time of the first power supply circuit 26a becomes longer as T1° in FIG. 4. Next, the process proceeds to step 160, where it is determined whether the transmitted signal from the transmitter 1 is included in the received signal, and if the signal is normal, the process proceeds to step 170, where the solenoid is driven, and then step 11
Return to 0. If the signal is not normal, the process returns to step 110 without driving the solenoid.

In the above configuration, as shown in FIG. 4, the receiving circuit 22 is turned on from time t1 to t11, but only at time T. After determining the code of the transmitted signal during this period, the switch turns off.

Furthermore, in the above-described embodiment, the microcomputer 24 discriminates between the presence or absence of a received signal and the quality of the received signal. may be provided independently. In this case, it is only necessary to supply power to the reception state determination circuit, and when there is no reception signal, the microcomputer 24
The power supply to the device can be turned off.

However, in this case, if the door lock solenoid 3 does not operate properly with one drive current, the second power supply circuit 26b uses the received signal to continue to issue a drive command to the solenoid drive circuit 25 until the door lock solenoid 3 is fully operated. Even after the reception of the signal has been completed, if the signal is legitimate, it is desirable to extend the time by an appropriate amount of time.

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, while the receiving means is waiting for a transmitted signal (standby), the receiving means is periodically turned on and off, and the received signal is output during this on-time period. Since the on-time is set to the minimum required minimum, power consumption in the receiving means during standby can be effectively reduced.

Furthermore, when a transmission signal is input, the receiving means is immediately turned off after reading the discrimination code included in the transmission signal, thereby preventing unnecessary power supply.

Therefore, according to the present invention, power consumption in the receiving means can be reduced very effectively.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the overall configuration of the present invention, FIG. 2 is a block diagram showing the overall configuration of an embodiment of the present invention, and FIG. 3 is a flowchart of the microcomputer shown in FIG. 2.
FIG. 4 is a waveform diagram of each part of the receiver shown in FIG. 2. DESCRIPTION OF SYMBOLS 1... Transmitter, 2... Receiver, 22... Receiving circuit, 24... Microcomputer, 26... Power supply circuit.

Claims (1)

[Scope of Claims] Receiving means for receiving a transmission signal from the transmission means and outputting a reception signal according to the transmission signal; a reception power supply means for periodically turning on and off the reception power supply means; when the reception signal is detected, a first command signal for turning on the reception means while reading a discrimination code included in the reception signal; output to the power supply means and detect that the reading of the discrimination code is completed;
A power consumption reduction device for a receiving system, comprising: a control means for outputting a second command signal for turning off the receiving means to the reception power supply means.