JPH04287740A - On-vehicle adapter for portable telephone - Google Patents

Abstract

PURPOSE:To perform the excitation control with only an on-vehicle adapter in an on-vehicle adapter system for using an on-vehicle portable telephone. CONSTITUTION:An ignition detecting circuit 15 and a gate circuit 17 for controlling its switch are provided on an on-vehicle adapter 12, the output ADPT of the ignition detecting circuit 15 generated when the ignition switch of a vehicle is turned on and the signal SNS of the processor of a portable telephone generated during a talk are inputted to the gate circuit 17, and the switch is closed when the ignition switch is turned on and the signal of the processor exists to feed power. The talk is not interrupted when the ignition switch is turned off during the talk.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an in-vehicle adapter system for using a mobile phone in a vehicle. Since mobile phones are portable, they can also be brought into cars and used as car phones. In this case, an adapter is installed in the car so that when the mobile phone is used as a car phone, the power source is taken from the car battery. The present invention relates to an in-vehicle adapter system in such a case.

0002

[Prior art] When using a mobile phone for in-vehicle use,
Conventionally, as shown in FIG. 2, a mobile phone 10 and a car adapter 1 are used.
2. The ignition detection circuit 14 and the automobile 20 are configured. Power for the mobile phone 10 is supplied from the battery of the automobile 20 through the ignition detection circuit 14 and the in-vehicle adapter 12 . Power is supplied only when the car's ignition switch is on (while the engine is running). The ignition detection circuit performs this control, and when the ignition switch is on, it is notified to the mobile phone 10 by an ignition detection signal S2, and in response to this, the mobile phone 10 connects the in-vehicle adapter 1 to close the power supply circuit.
2 is used when attaching a mobile phone to a car; it takes power from the car battery and reports to the mobile phone that it is being used in car mode. Mobile phones have a power source (battery), but they also have a charging function. others,
It also has an interface for connecting to hands-free and booster amplifiers, which are optional in-vehicle functions. This in-vehicle adapter 12 is equivalent to an adapter (charger, etc.) for a cordless telephone.

[0003] Control based only on ignition detection
If the ignition switch is turned off during a call, the power supply will be cut off, which is inconvenient. When a car is stopped to make a call and the call is long, the engine is often turned off as well, so it is common for the ignition switch to be turned off during a call. However, it is undesirable that when the switch is turned off, the power is also cut off, making it impossible to talk. Therefore, the in-vehicle adapter 12 also performs control to continue power supply during the call.

0004

As shown in FIG. 2, conventionally, an in-vehicle adapter and an ignition detection circuit are interposed between a mobile phone and a car, resulting in a complicated configuration. The object of the present invention is to improve the above-mentioned problems and to enable power supply control using only an in-vehicle adapter.

[0005]

[Means for Solving the Problems] As shown in FIG.
It is possible to control the power supply by simply interposing 2. This in-vehicle adapter is provided with an ignition detection circuit 15, an OR gate 17, and a switch 16 for power supply control. One input of this OR gate 17 is the output of the detection circuit 15, and the other input is the busy signal SNS of the processor 1 of the mobile phone 10.

[0006]

[Operation] In this configuration, when the ignition switch of the automobile is on, the detection circuit 15 detects this and generates an H level output in this example, and therefore the output of the OR gate 17 becomes H level, turning on the switch 16. do. Therefore, the battery of the car 20, the switch 16, the regulator 18
Power is supplied to the mobile phone 10 through this route. When a call is in progress, processor 1 sets the call signal SNS to H level,
This passes through the OR gate 17 and enters the switch 16. Therefore, even if the ignition switch is turned off during a call, the power supply to the mobile phone will not be cut off. When the call ends, the processor 1 detects this and sets the signal SNS to L level. Therefore, if the ignition switch is off, the two inputs of the OR gate 17 become L, the output is L, and therefore the switch 16 is turned off and the power supply to the mobile phone 10 is stopped. Thus, according to the present invention, it is possible to control the power supply to a mobile phone using only the in-vehicle adapter.

[0007]

[Embodiment] To explain the configuration of FIG. 1 in detail, the in-vehicle adapter 12
In addition to the above-mentioned circuit elements, there is also a regulator 18 and a switch 1.
Equipped with 9. The regulator 18 has a function of protecting the mobile phone power line from external noise such as ignition noise. BATT, (battery) IGN (ignition), CUPOW, SNS (sense), ADPT (
adapter) and AVR (automatic voltage regulator) are connected to each terminal of the in-vehicle adapter as shown. Signals at these terminals (indicated by the same symbols) are shown in FIG. 1(b). In addition to the processor 1, the mobile phone 10 also includes an R-S flip-flop 2.
, an OR gate 3, a switch 4, and a regulator 5. The regulator 5 is for keeping the power supply voltage of the processor 1 constant, and also has the function of blocking external noise and eliminating ripples. The mobile phone 10 has a built-in power source (battery), but when it becomes a car phone, it can be switched to a car battery (by a changeover switch not shown).

As shown in FIG. 1(b), the ignition signal IGN and the output signal AD of the ignition detection circuit 15
PT is almost the same signal. The signal ADPT is input to the OR gate 17 and also to the OR gate 3, and the switch 4 is closed. The processor 1 is now in an operating state and outputs a signal SET that sets the flip-flop 2. Now flip-flop 2 is set and its Q
The output is supplied to OR gate 3. This makes the switch 4 self-holding, so to speak. At the end of the call, processor 1 sends a signal SNS
is set to L level and outputs a reset signal RESET. This resets the flip-flop 2, and if the ignition is off, the two inputs of the OR gate become L, the output becomes L, and the switch 4 turns off.

[0009]

As described above, according to the present invention, when a mobile phone is used in a vehicle, the power supply of the mobile phone can be controlled using only the vehicle adapter, and the configuration can be simplified.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of an in-vehicle adapter system of the present invention.

FIG. 2 is a block diagram showing a conventional method.

[Explanation of symbols]

10 Mobile phone 12　Car adapter 20　Automobile 16 Switch 17 Or Gate

Claims (1)

[Claims] Claim: 1. An ignition detection circuit ( 15) and a gate circuit (17) for controlling the switch, and to the gate circuit, the output (ADPT) of the ignition detection circuit that occurs when the ignition switch of the automobile is on, and the processor of the mobile phone that occurs during a call. A signal (SNS) of the mobile phone is input, and the switch is closed when the ignition switch is on and when the signal from the processor is present, thereby supplying the power. .