JPS6387098A - Power source supervising device for data transmission equipment - Google Patents

Abstract

PURPOSE:To always supervise the power source voltage of a transmitter at a receiver side by supervising the power source voltage at every time a switch is operated and transmitting a supervisory result to the receiver with the transmitter. CONSTITUTION:When the switch SW1 of the transmitter is turned on, a power source circuit 120 is turned on and a voltage is supplied to a transmission code generating circuit 100. In this time, a voltage supervising circuit 110 judges whether or not the supplied voltage is a prescribed value or above, and instructs a transmission code generating circuit 100 to set a battery code to 1 when the voltage comes to be a prescribed value or below. The transmission code generating circuit 100 forms a data format based on this, and transmits the data through a modulating circuit 130 to a receiving side. When the receiver detects that a battery code is set into the data format, a light emitting diode lights up and the alarm of the reduction of the power source voltage of the transmitter is given.

Description

Detailed Description of the Invention [Objective of the Invention] (Industrial Field of Application) The present invention is directed to a system that includes a transmitter and a receiver and has a predetermined distance between them, such as a system for remotely controlling a car door lock. The present invention relates to a device for transmitting data, and particularly to a power supply monitoring device for monitoring power supply voltage.

(Prior Art) Systems for operating car door locks, etc. using electronic keys have been proposed in the past (for example, Japanese Patent Publication No. 56-3471
No. 9, JP-A-57-108373). In this type of system, the electronic key is equipped with a transmitter that generates a predetermined identification signal, and a receiver is installed on the vehicle body, and when the receiver receives the predetermined identification signal, it performs a predetermined unlocking operation. It is configured to do so.

By the way, among these types of systems, those that allow remote control from a location away from the vehicle also require a power source on the electronic key side.

For this reason, these electronic keys are equipped with a power source such as a battery.

(Problems to be Solved by the Invention) However, since the electronic key needs to be carried and used, it is desired that the electronic key be small. Therefore, it is difficult to store large capacity batteries, and it is necessary to replace or charge the batteries as appropriate. However, since the replacement of these batteries is left to the user's discretion, the capacity of the battery may be completely consumed in some cases, and as a result, the unlocking operation may not be possible.

Therefore, an object of the present invention is to monitor the state of the power supply on the transmitter side and notify the state.

[Structure of the invention]

(Means for solving the problem) Therefore, in the present invention, at least one switch; wave generating means; power source means for supplying electric power to the wave generating means; monitoring means for monitoring the voltage of the power source means; a data transmitter comprising: a first control means that instructs the wave generation means to output a carrier wave when the switch is operated, and modulates the carrier wave with a signal containing detection information of the monitoring means; a wave receiving means for receiving the wave outputted by the wave generating means and outputting a predetermined electric signal; extracting and determining the detection information of the monitoring means from the electric signal demodulated by the wave receiving means; The data receiving device includes: a second control means for outputting a corresponding electric signal; and a display means for displaying a state according to the electric signal outputted by the second control means.

(Function) According to this, when the switch is operated, the transmitting device
The detection result of monitoring the voltage of the power supply means is transmitted. The receiving device receives this detection information and displays the detection result on the display means. Therefore, the power supply of the transmitter is monitored every time the switch of the transmitter is operated. Then, a display according to the result can be performed on the receiving device side.

(Example) Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

First, FIG. 1 shows and outlines the format of data used between a transmitting device and a receiving device in an electronic lock system for automobiles embodying the present invention.

In FIG. 1, a header consisting of 4 bits is used to establish synchronization during reception, and a specific pattern is used. In this example, 101O is used as the header. After this, a control code is sent. The control code consists of 4 bits, so eight types of information can be transmitted. In this example, the fixed pattern 1111 is set because the only instruction is to unlock the trunk lock mechanism as described above.

After this, a battery code will be sent to you. The battery code consists of 1 bit, and in this example, as will be described later, 1 is set when the power supply voltage of the transmitting device falls below a predetermined value. This battery cord transmits the state of the power supply voltage of the transmitting device.

Finally, a recognition code will be sent. The recognition code consists of 16 bits, and only when the recognition code matches the recognition code preset in the receiving device, the control indicated by the control code and battery code is performed.

Next, a transmitting device that creates and transmits a data format will be explained.

Referring to FIG. 2, this transmitter includes a transmission code generation circuit 100. Voltage monitoring circuit 11O9 power supply circuit 120.
Modulation circuit 1301 Oscillation circuit 140° High frequency amplification circuit 15
Equipped with 0 etc. In this example, the switch SWI instructs the trunk lock mechanism to be unlocked.

The transmission code generation circuit 100 includes a recognition code generation circuit made up of a large number of resistors. As a result, a 16-bit recognition code whose state is fixed at a predetermined binary level is generated.

Battery B is connected to the input power line of the power supply circuit 120.
T2 is connected. When switch SW1 is turned on,
When the power supply circuit 120 is turned on, the transmission code generation circuit 100
voltage is supplied to the When the power supply circuit 120 is turned on, the transmission code generation circuit 100 outputs a pumping signal to the power supply circuit 120, thereby self-maintaining the power-on state.

At this time, the voltage monitoring circuit 110 determines whether the supplied voltage is above a predetermined value, and if it is below the predetermined value, outputs it to the transmission code generation circuit 100 in order to set the aforementioned battery code to 1. . Here, an example of a specific circuit of this voltage monitoring circuit 110 is shown in FIG. transistor Q
1, the output voltage of the power supply circuit 120 is connected to the resistor R1.
, R2, a voltage divided to a predetermined value is applied. Then, the output voltage of the power supply circuit 120 decreases to this predetermined value,
The transistor Q1 is set to turn off when the voltage drops to a value that requires battery replacement or the like.

Therefore, when the output voltage of the power supply circuit 120 is above a predetermined value, the transistor Q1 is on, and when the output voltage is below the predetermined value, the transistor Q1 is turned off. Thereby, the transmission code generation circuit 100 can set a predetermined value to the battery code according to these detections.

The transmission code generation circuit 100 forms transmission data based on the data format described above, and a serial binary signal corresponding to the transmission data is applied to the modulation circuit 130. Therefore, high frequency signals of two predetermined frequencies appear alternately at the output of the modulation circuit 130.

The oscillation circuit 140 oscillates a radio frequency, and after amplifying the modulated signal with the high frequency amplification circuit 150,
Radio waves are radiated from the antenna 160.

As described above, when the switch SWl of the transmitting device is turned on, the power supply voltage of the transmitting device is monitored, and if the voltage is below a predetermined value, transmitting data including this information is emitted.

Next, FIG. 4 shows the receiving side of the electronic lock system, that is, the receiving device installed on the vehicle. Referring to FIG. 4, this receiving device includes a receiving unit 10°, a power supply unit 20. Signal processing unit 30. Microcomputer 40. Switch matrix 50° driver 609 light emitting diode L
It is equipped with an ED, an LED driver 70, and the like.

A receiving antenna RAN is connected to the receiving unit 10. An on-vehicle battery BT is connected to the input power line of the power supply unit 20.

The switch matrix 50 includes 161 switches in this example, which are connected to ports PA and PB of the microcomputer 40 in a matrix. The states of these 16 switches correspond to the unique identification code of this receiving device itself.

A solenoid SLI that controls the trunk lock mechanism to unlock is connected to the output terminal of the driver 60.

The light emitting diode LED is connected to the microcomputer 40 via the LED driver 70, and according to instructions from the microcomputer 40, the light emitting diode LED is
lights up.

In these configurations, the operation of the microcomputer 40 will be explained with reference to FIG. First, when the receiver is powered on, the microcomputer 40 performs initial settings (step 510). Next, the switch matrix 50
The determined recognition code is set inside the microcomputer 40 (step 511). After that,
Header detection operations are performed until a signal is received and a header is detected (step 512). When the header is detected, it is checked whether the recognition code set in the microcomputer 40 and the recognition code of the received data match (step 513).

When the two match, the control included in the received data, that is, the solenoid SLI for unlock control is energized (step 514). Next, the battery code of the received data is referred to (step 515).

If the battery code is 1, the LED driver 70 is activated (step 516) to illuminate the light emitting diode LED to alert that the power supply voltage of the transmitter is low. If the battery code is O, the LED driver 70 is not energized. After a predetermined period of time has elapsed, the solenoid SLI that was set to be energized is set to be de-energized (step 517), the process returns to the header detection step, and the above operations are repeated.

In this operation, header detection, recognition code checking, and solenoid SLI energization and deenergization processing are described in Japanese Patent Application No. 1986-1 previously filed by the same applicant.
Since I am familiar with No. 20149, I have simplified it here.

As described above, when the transmitter is operated, the power supply voltage of the transmitter is detected. If the voltage is below a predetermined value, the battery code in the data format is set.

When the receiving device detects that the battery cord is set, it lights up a light emitting diode LED to warn that the power supply voltage of the transmitting device is decreasing.

〔Effect of the invention〕

As described above, each time the transmitting device is operated, it transmits the detection result of monitoring the voltage of the power supply means. The receiving device displays this detection result on the display means.

Therefore, the voltage of the power supply means of the transmitter can be constantly monitored. By displaying the voltage state of the power supply means, it is possible to deal with the problem before the power supply means completely loses its capacity.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing a data format used in a power supply monitoring device according to an embodiment of the present invention, FIG. 2 is a block diagram showing a transmitting device used in a power supply monitoring device according to an embodiment of the present invention, and FIG. 3 is a circuit diagram showing the power monitoring circuit shown in FIG. 2, FIG. 4 is a block diagram showing a receiving device used in the power monitoring device according to an embodiment of the present invention, and FIG. 2 is a flowchart showing an outline of the operation of the microcomputer 40. 10... Receiving unit (wave receiving means), 20... Power supply unit, 30... Signal processing unit (demodulating means/
wave receiving means), 40...microcomputer (second
control means), 50... switch matrix, 60...
...Driver, 70...LED driver (display means)
, 100... Transmission code generation circuit (first control means)
, 11O... Voltage monitoring circuit (monitoring means), 120...
- Power supply circuit (power supply means), 130... Modulation circuit (wave generation means), 140... Oscillation circuit (wave generation means), 15
0...High frequency amplifier circuit (wave generation means), SWI...
Switch, LED...Light emitting diode (display means)

Claims (1)

[Scope of Claims] At least one switch; wave generating means; power source means for supplying power to the wave generating means; monitoring means for monitoring the voltage of the power source means; when the switch is operated, a carrier wave is transmitted to the wave generating means; a data transmitter comprising: a first control means for instructing the output of the carrier wave and modulating the carrier wave with a signal including detection information of the monitoring means; and a data transmitter comprising a demodulation means and receiving a wave output from the wave generation means. wave receiving means for outputting a predetermined electric signal; a second control means for extracting and determining detection information of the monitoring means from the electric signal demodulated by the wave receiving means and outputting an electric signal according to the result; a data receiving device comprising: a display means for displaying a state according to an electrical signal outputted by the second control means;
A power monitoring device for a data transmission device comprising: