JPH03184426A - Power unit for radio communication equipment - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a power supply device for a vehicle-mounted wireless communication device that uses a battery provided in the vehicle as a power source.

[Conventional Example] In recent years, various types of wireless communication devices have been proposed, including ones that are small and have a large transmission output. Some of these wireless communication devices are installed in vehicles and are powered by the vehicle's battery, and these in-vehicle wireless communication devices are not only used for business purposes, but are also being used by the general public. Ta.

By the way, in the case of the above-mentioned wireless communication devices, especially commercial wireless communication devices, devices with high transmission output are used in order to ensure reliable communication with command stations and other vehicles. Because of its large size, it is now supplied directly to the vehicle's battery.

FIG. 2 shows a conventional example of this, and in this figure,
The power supply device includes a power switch 1 for supplying and stopping power to the wireless communication device, a relay circuit (opening/closing circuit) 2 that is activated when the power switch 1 is turned on, and a vehicle battery 3.
A choke coil 4 and a smoothing capacitor 5 are provided to remove engine noise and the like superimposed on the power supplied from the engine.

Here, when the power switch 1 is turned on, the relay circuit 2 is activated, and the relay switch 2a is turned on, so power from the battery 3 is output (supplied) to the wireless communication device via the relay circuit 2. At this time, noise due to engine operation may be superimposed on the power supplied to the wireless communication device, but the engine noise and the like are removed by the choke coil 4 and capacitor 5. Therefore,
A stable power supply without noise is supplied to the wireless communication device, and communication by the wireless communication device is performed stably.

[Problems to be Solved by the Invention] By the way, in the power supply device for the wireless communication device described above, 1. If you forget to turn off the power switch 1, the reception special current or standby current will continue to flow, so if you leave the vehicle for a long time, for example if it is left in a parking lot or garage for many days, the battery 3 Electric capacity decreases, wireless communication equipment becomes unusable, and.

In some cases, the vehicle's engine would not start.

Therefore, the 0N10FF of the vehicle's ignition switch
A system has been proposed in which the power switch 1 is turned ON and OFF in conjunction with the power switch 1, which prevents the user from forgetting to turn off the power switch 1. However, it is necessary to provide a cable (accessory) between the ignition switch and the power supply.

When setting up a wireless communication device in a vehicle, there is a problem in that complicated work such as cable wiring is required.

This invention was made in view of the above problems, and its purpose is to provide a wireless communication device and its power supply device that can automatically stop the power supply and reduce battery power consumption when the user forgets to turn off the power switch. Our goal is to provide the following.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a noise detection means for detecting noise contained in the power supply in a power supply device for a radio communication device that uses a battery as a power source provided in a vehicle. and a control means for automatically stopping the supply of the power when the noise detection is not performed for a predetermined period of time when the power is supplied.

Further, the control means includes a timer circuit that is reset by the noise, and stops supplying the power when the noise is not detected and the timer circuit finishes operating.

[Effect] With the above configuration, if the engine is turned off but the power supply of the wireless communication device is not turned off.

Power from the battery continues to be supplied to the wireless communication device. At this time, since the power supplied from the battery does not include noise from the engine or the like, the timer circuit for a predetermined period (for example, 10 hours) is not reset and remains in the 5-operation state. Then, when the timer time has elapsed, the timer circuit ends its operation, and the supply of the power is controlled to stop due to this end of operation. In this way, if the engine is turned off but the power switch of the power supply device is not turned off and the vehicle is not used for a long time or even days, power will be supplied to the wireless communication device after the timer time of the above-mentioned timer circuit has elapsed. will be stopped automatically.

In addition, if the engine is not turned off, that is, if the vehicle is in use, the timer circuit is constantly reset, so the timer circuit does not stop operating and the power supply to the wireless communication device is interrupted. If the engine is not stopped, or if the engine is turned off but immediately turned back on and the vehicle is used again, noise will be generated by the engine, etc., and the timer circuit will be reset before the operation ends, so the same applies to the above.

The power supply to the wireless communication device is not stopped.

[Example] Hereinafter, an embodiment of the present invention will be described based on FIG. 1.

In FIG. 1, the same parts as in FIG. 2 are designated by the same reference numerals, and redundant explanation will be omitted.

In FIG. 1, the power supply device of the wireless communication device includes an np switch that activates the relay circuit 2 when the power switch 6 is turned on.
An n-type transistor 7, a DC blocking capacitor 8 that passes noise components (noise from the engine, etc.) superimposed on the power source of the vehicle battery 3, and a noise amplification circuit 9 that amplifies this noise to a predetermined size. The detection circuit IO detects this amplified noise component and converts it into a DC voltage, and when the power switch 2 is turned on, it resets a predetermined time (for example, a long time such as 10 hours) or operates depending on whether or not noise is detected. , and a timer circuit (for example, an IC timer circuit) 11 that outputs a control signal that turns on the transistor 7 in the reset state and turns off the transistor 7 in the timer operation end state. .

Here, it is assumed that the engine of the vehicle of the wireless communication device having the above configuration is operating and the power switch 6 is turned on. At this time, noise from various devices during engine operation, such as engine noise, is superimposed on the power source of the battery 3. Therefore, the noise component superimposed on the power supply passes through the capacitor 8 and is amplified to a predetermined magnitude by the noise amplification circuit 9. That is, when detecting a noise component in the detection circuit IO, it is possible to detect the noise component and easily obtain a DC voltage corresponding to the noise component. and,
The operation of the timer circuit is reset by the DC voltage signal generated by the noise component.

Transistor 7 is turned on. The timer circuit 11 is retriggered until the noise detection is no longer performed.
The timer never expires.

Therefore, the timer circuit is constantly reset while noise from the engine or the like is being detected.

At this time, since the power switch 6 remains ON, the power from the battery 3 is applied to the relay circuit 2 via the transistor 7, so the relay circuit 2 is activated and the relay switch 2a is turned ON. Ru. Thereby, the power of the battery 3 is supplied to the wireless communication device via the power supply device, so that the wireless communication device can be used.

Next, it is assumed that the driver turns off the engine but forgets to turn off the power switch 6 and leaves the vehicle. Then, since the power supply of the battery 3 no longer contains noise, the DC voltage of the detection circuit IO becomes an extremely low value compared to the above case. This "L" level activates the timer in the timer circuit 11, and this timer operation is not reset until the 'H' level is input. is timer circuit 1
1 outputs a control signal to turn on the transistor 7, so that the wireless communication device is supplied with power from the battery 3 as before.

Subsequently, when the timer operation of the above-mentioned timer cycle [11 is completed, that is, no noise is detected during the timer time and the timer circuit 11 is not reset, the timer circuit 11 outputs a control signal to turn off the transistor 7. be done. As a result, the relay switch 2a of the relay circuit 2 is turned to O.
It is set to FF, and power from the battery 3 is no longer supplied to the wireless communication device.

In other words, if the engine does not start for the timer period (10 hours), it means that the vehicle is parked in a parking lot, the wireless communication device is not used, and it is obvious that the driver forgot to turn off the power switch 6. This is because it can be determined that

Furthermore, if the engine is started while the timer circuit 11 is operating, the power supply again contains noise, so the timer operation is reset. This reset state causes
The timer circuit 11 is retriggered and its timer operation does not end until the noise detection is no longer performed.Therefore, if only the engine is turned off and the vehicle is temporarily left, the above timer period (10 hours) When the user returns within the range and starts the engine, the wireless communication device can be used without stopping the power supply from the battery 3.

In this case, the engine is turned off but the power switch 6 is not turned off in order to park the vehicle in a parking lot, garage, etc. and leave it there for a long time.

The power supply to the wireless communication device is automatically stopped before the power of the battery 3 is consumed, so if you try to use the vehicle after a long period of time (or several days), the power of the battery 3 will be This is particularly effective when the vehicle is not used for many days.

In addition, since there is no need to link the ignition switch to ON10FF, there is no need for complicated work such as wiring cables, and the circuit of the power supply device can be easily constructed, so it can be realized at low cost.

In addition, if the power supply switch 6 remains ON and the power supply to the wireless communication device is stopped, turn the power switch 6 to 0F.
By turning on the timer circuit 11 and the like after FL, the timer circuit 11 etc. are set to the initial state, and power from the battery 3 can be supplied to the wireless communication device again.[Effects of the Invention] As explained above, According to the power supply device of the main type wireless communication device of this invention, noise superimposed on the power supply is detected,
Since the power supply to the wireless communication device is automatically stopped when this noise is not detected for a predetermined period of time, it is possible to prevent forgetting to turn off the power switch of the power supply device, reduce battery power consumption, For example, many days)
This has the effect of eliminating the problem that when the vehicle is not used, the battery power is consumed and the engine does not start.

[Brief explanation of drawings]

FIG. 1 is a schematic block diagram of a wireless communication device showing an embodiment of the present invention, and FIG. 2 is a schematic block diagram of a conventional power supply device for a wireless communication device. In the figure, 1 and 6 are power switches, 2 is a relay circuit, 2a is a relay switch, 3 is a battery (vehicle), 4 is a choke coil, 5 is a capacitor, 7 is a transistor (NPN type), and 8 is a capacitor (DC 9 is a noise amplification circuit, IO is a detection circuit, and 11 is a timer circuit.

Claims (2)

[Claims] (1) A power supply device for a wireless communication device that uses a battery as a power source provided in a vehicle, comprising a noise detection means for detecting noise contained in the power source; and when the noise detection is not performed for a predetermined time when the power is supplied 1. A power supply device for a wireless communication device, comprising: a control means for automatically stopping and controlling the supply of power. (2) Claim (1) wherein the control means includes a timer circuit that is reset by the noise, and stops supplying the power when the noise is not detected and the timer circuit finishes operating. ) The power supply device for the radio communication device described in ).