JPH0134265Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a starting device for circuit equipment, and particularly to a starting device for circuit equipment using a timer.

Timers that operate circuit devices at a preset time have been widely used for a long time, and in recent years
IC (integrated circuit) timers have become available at low cost and are becoming more widely used. FIG. 1 is a diagram showing an example of an operating circuit for in-vehicle equipment using a timer. Power is supplied from a car battery 1 to a circuit equipment 4 via a switch 2 linked to the engine key and a timer control switch 3, and the battery is The switch 3 is controlled to be turned on by the on-timer 5 which directly receives power from the switch 1. Power is supplied directly to the timer 5 from the car battery 1 because the clock function of the timer needs to proceed regardless of whether the device 4 is on or off, but the power consumption of the timer 5 is extremely small and can be ignored. There is no problem in practical use. Although not particularly shown, a manual power control switch is separately provided, and this manual switch also turns on the switch 3 to turn on the circuit device 4 at any time according to the user's request.
I am now able to make it work.

With such a configuration, when the user is absent and the engine key 2 is not operated, the battery 1 is not supplied to the circuit device 4 even if the timer 5 is activated and the power switch 3 is turned on. Power is not supplied from. Therefore, there is no power consumption and over-discharge of the battery is prevented.

However, if the switch 3 is connected directly to the battery 1 due to incorrect wiring, power will be supplied to the device 4 by the operation of the timer 5 regardless of whether or not the engine key is operated.
The electric power of the battery 1 will be consumed unnecessarily, leading to over-discharge, which will interfere with restarting the engine. Such miswiring is a problem that often occurs in the wiring harness inside the dashboard, which has poor visibility inside a narrow vehicle.
Particularly when the user installs the circuit equipment by himself, the probability of miswiring becomes extremely high.

In order to improve this inconvenience, it may be possible to limit the amount of time the device operates using a timer. That is, a timer is used to start the device, and after a certain period of time has elapsed, the device is always turned off, and then, if necessary, the user manually turns on the power. By doing this, it is possible to eliminate the wastage of battery due to the timer operation when the user is absent, but since the circuit equipment is cut off after a certain period of time after activation by the timer, for example, in the case of audio equipment, audio and music etc. This causes discomfort and requires the user to turn on the power, which lacks the convenience of using a timer.

An object of the present invention is to provide a timer-based activation device that prevents over-discharge of the power source and minimizes the user's operational hassle.

The activation device for circuit equipment according to the present invention includes a detection means that generates a detection signal when a circuit device other than a predetermined circuit device among a plurality of audio devices is in an operating state, and a means that generates a reset signal in response to an operation. and a time measuring means that measures a predetermined time from the time when power supply is started by the timer when the detection signal is not present and stops the measurement in response to a reset signal, and a predetermined circuit when the time measuring means finishes measuring the predetermined time. The device is characterized by having a control means for stopping the supply of power to the device.

An embodiment of the present invention will be described below with reference to FIG. In FIG. 2, parts equivalent to those in FIG. 1 are indicated by the same reference numerals, and their explanation will be omitted. The power switch 3 of the circuit device 4 is controlled by a so-called on timer 5 that turns it on and a so-called off timer 6 that turns it off. Furthermore, in order to detect the operating status of other circuit devices (not shown) that are not controlled by the timer, branch lines derived from the power lines of these devices are used as inputs of the OR gate 8, and the power source of the device 4 itself Line is also used as one input. This OR gate output is applied to a data input (D input) of a D-FF (delayed flip-flop) 9. The output of the off-timer 6 is supplied to the clock input (CK input) of this D-FF9, and the output of the D-FF9 serves as the set input of the off-timer 6 and also serves as the trigger input of the warning generator 7. . The off-timer 6 is reset by an external reset signal from the user. Note that the OR gate 8 corresponds to a detection means, the off timer 6 corresponds to a time measurement means, and the power switch 3 corresponds to a control means.

When the on-timer 5 completes the time measurement after being set, a signal indicating time up is supplied to the switch 3 via the off-timer 6, thereby turning on the switch 3. Therefore, the circuit device 4 becomes operational, and the CK of D-FF9 is activated.
A trigger will be applied to the input. At the moment of this trigger application, the D-FF 9 reads the output of the OR gate 8 and outputs it. Now, if at least one of all the other circuit devices is operating immediately before the timer 5 starts activating the circuit device 4, the output of the OR gate 8 is at a high level, and at the moment of the trigger, D -FF9 latches this high level input data and at the same time its output transitions from high level to low level. Therefore, neither the off timer 6 nor the warning generator 7 is set, and the circuit device 4 continues to operate. In other words, if at least one of the other devices had been operating, it would not have been turned on by timer 5, so it can be assumed that the user was present and turned on device 4. There is no problem even if it is operated continuously. Furthermore, even if the signal indicating the above-mentioned time-up is supplied to the switch 3, the voltage of the battery 1 is not immediately output to the line from the switch 3 to the circuit device 4 due to the delay in the operation of the switch 3. The high level signal generated by the operation is read from the OR gate 8.

If all other devices are turned off,
Even if the on-timer 5 finishes measuring time and a signal indicating time up is supplied to the switch 3, the low level output of the OR gate 8 is read into the data input of the D-FF9 due to the delay in the operation of the switch 3, and the power is at a high level. maintained. So, off timer 6
is set and the warning generator 7 issues a warning. If a user is present during this time, he or she performs a reset operation to reset the off timer 6 and turn off the switch 3. As a result, as will be described later, the output of the D-FF 9 changes to a low level due to a change in the output of the off-timer 6, and the warning generator 7 is reset. From then on,
The circuit device 4 operates continuously. If there is no user, the off timer 6 turns off the switch 3 after a certain period of time, cutting off the power line to the circuit equipment 4.

The warning generator 7 may be configured to provide a visual notification using a light emitting element, or may be configured to provide an auditory notification using an acoustic output.
In the latter case, a warning sound of a constant frequency may be used, or a so-called meaningful sound such as "Please reset" may be emitted.

The switch 3 is turned off by the operation of the off timer 6, but the output change of the off timer 6, that is, D
-The power line input to the circuit device 4 of the OR gate 8 can be considered to be at a high level due to the above-mentioned operation delay of the switch 3 and the time constant of the power line in the device 4 at the moment when the CK input level of the FF9 becomes high. D-FF
At that moment, the output of the alarm 9 changes from high level to low level, and the setting of the warning generator 7 is released.

The warning may be issued not only before the off timer 6 turns off the device, but also before the on timer 5 turns on the device. This is to prevent the device from operating unexpectedly and surprising the user. Additionally, even if the device becomes inoperable for some reason, it is possible to notify the user that the scheduled time has arrived. That is, by generating an alarm at an appropriate time in accordance with the operation of the on-timer 5 or the off-timer 6, the starting device according to the present invention can be made easier to operate.

As mentioned above, according to the present invention, even if the wiring is such that power is supplied directly from the battery 1 to the circuit device 4 through the switch 3 without going through the engine key 2,
This prevents unnecessary battery power consumption due to on-timer operation. Further, since the configuration is such that the on-operation of other circuit devices is detected in advance, the present invention is particularly useful since no operation is required from the user when the other device is on-operated.

Although all of the above circuits are shown as blocks, it is obvious that they can be constructed in the same way in software using a so-called microcomputer or the like. Moreover, it can be used not only for in-vehicle use but also for other devices with limited power supply capacity.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a starting circuit using a conventional timer, and FIG. 2 is a block diagram of an embodiment of the present invention. Explanation of the symbols of the main parts, 1...Battery, 3...
...Power switch, 4...Circuit equipment, 5...On timer, 6...Off timer, 7...Warning generator, 9...D-FF.

Claims (1)

[Claims for Utility Model Registration] (1) A starting device for a circuit device that automatically supplies power to a predetermined circuit device among a plurality of audio devices installed in a vehicle using a timer, a detection means for generating a detection signal when a circuit device other than the predetermined circuit device among the devices is in an operating state; a means for generating a reset signal in response to an operation; a time measuring means that measures a predetermined time from the start of power supply and stops the measurement in response to the reset signal; and a time measuring means that stops supplying the power to the predetermined circuit device when the time measuring means finishes measuring the predetermined time. 1. A starting device for a circuit device, characterized in that it has a control means for controlling the circuit device. (2) The starting device for a circuit device according to claim 1, wherein the timer control means includes an alarm generator that issues an alarm while the measuring means is measuring.