JP6503193B2 - Electronics - Google Patents

Description

  The present invention relates to an electronic device, and more particularly to an electronic device provided with a capacitor as a backup of a power supply.

  As an electronic device mentioned above, an alarm which operates by receiving power supply from an AC power source which is an external power source is known. In such an alarm, there is a possibility that the user may unplug the connection plug with the AC power supply. With the plug removed, an alarm can not be generated when an abnormality actually occurs.

  Therefore, it has been proposed that a capacitor is provided in an alarm as a backup power supply, and when the plug is removed, power is supplied from the capacitor to notify that the plug is removed and to urge the plug to be reinserted.

  The capacitors mentioned above are not initially charged, but are charged after connecting the plug to an AC power supply and being turned on. As described above, since charging of the capacitor is started at the same time when the power is turned on, various problems have occurred.

  First, if the plug is removed before the capacitor is charged, the plug removal can not be notified. In particular, when it is desired to notify by voice that "Please do not remove the plug", it is necessary to use a capacitor with a large capacity to operate the audio output circuit, charging takes time, and a period in which the plug removal can not be notified. Will be longer.

  Furthermore, if the plug is unplugged before the capacitor is sufficiently charged, the power is insufficient and an unstable notification is given. Specifically, in the case of notifying "Please do not withdraw" by voice, for example, there is a risk that the voice may be cut off by "withdrawal". In addition, when a signal for notifying plug removal is output to an external device such as a gas meter, the signal may be interrupted halfway, which may cause an erroneous determination.

  Then, this invention makes it a subject to provide the electronic device which solved the various problems which arose in order to start charge of a capacitor simultaneously with power activation.

The invention according to claim 1 made in order to solve the above-mentioned problems is an electronic device comprising a load operated by receiving a power supply and a capacitor charged by the power supply, wherein the load is Cutoff detection means for detecting the shutoff of the power supply, and notification means for generating notification by sound upon receipt of the discharge current from the capacitor when the shutoff of the power supply is detected , indicating that the shutoff of the power supply has occurred. And, after the start of the power supply, determination means for determining whether the capacitor is charging or charging completion, and when it is determined that the charging is being performed by the determination means when interruption of the power supply is detected. is an electronic device characterized in that it and a notification stopping means for stopping the notification by the notification means.

According to a second aspect of the invention, an electronic device according to claim 1, characterized by further comprising a charging notification means for notifying a charging until it is determined that the end of charge by the pre-Symbol judging means is there.

As described above, according to the first aspect of the present invention, the determination means determines whether the capacitor is being charged or finished charging after the start of the power supply, and the determination means determines that the power is shut off. If it is determined that charging is in progress, the notification by the notification means is stopped. As a result, since unstable notification is not performed, the user's sense of anxiety can be wiped out. Therefore , it is possible to perform an operation that solves various problems that have occurred because the operating means started to charge the capacitor simultaneously with the power-on.

According to the second aspect of the present invention, further includes a charging notification means for notifying a charging until it is determined that the end of charge at the discretion constant means. As a result, it is possible to grasp a period in which the user can not notify that the power is shut off, and to urge the user not to pull out the plug during charging.

It is a circuit diagram showing one embodiment of an alarm as an electronic device of the present invention. It is a flowchart for demonstrating the initial stage delay processing procedure of CPU shown in FIG. 1 in 1st Embodiment. It is a time chart which shows the lighting state of the light emitting diode after the power activation in 1st Embodiment. It is a flowchart for demonstrating the plug omission alerting | reporting process procedure of CPU shown in FIG. 1 in 2nd Embodiment.

First Embodiment
Hereinafter, an alarm as an electronic device of the present invention will be described with reference to FIG. The alarm shown in FIG. 1 is an alarm that detects an abnormality such as a gas leak, for example. As shown in the figure, the alarm device 1 operates by receiving supply of a circuit control power supply V1 (= power supply) of 5 V DC, for example, a light emitting diode 12 (hereinafter abbreviated as “LED 12”), an audio output circuit 14 and the like. And a capacitor C which supplies power to the load 10 by discharging when the circuit control power supply V1 is cut off.

  The CPU 11 controls the entire alarm device 1. The transistor Tr is connected in series to the LED 12. The CPU 11 controls the lighting of the LED 12 by performing the on / off control of the transistor Tr. The voice output circuit 14 outputs, for example, a voice indicating that an abnormality such as a gas leak has occurred (for example, "Is there a gas leak?" Or a voice indicating that the plug has been removed (for example, "Don't pull it out") It is a circuit, and its output is controlled by the CPU 11. As apparent from the above, the CPU 11 and the audio output circuit 14 correspond to notifying means.

  The alarm device 1 further includes a regulator 15 that outputs the circuit control power supply V1 of 5 V when the power supply V2 of DC 7 V is input, for example, and supplies it to the CPU 11, the LED 12 and the audio output circuit 14 or the capacitor C. . The power source V2 is a power source obtained by converting an AC power source from an AC power source into 7 V DC by an AC / DC converter (not shown) and a DC / DC converter.

  The alarm device 1 further includes a resistor R1 and a first diode D1, a second diode D2, and voltage dividing resistors R21 and R22. The resistor R1 and the first diode D1 are connected in parallel with each other on a connection line through which both the charging current Ic from the circuit control power source V1 to the capacitor C and the discharging current Id from the capacitor C to the load 10 flow. The first diode D1 is connected such that the discharge current Id flows in the forward direction.

  The second diode D2 is connected to the input side of the regulator 15, and is connected such that the charging current Ic flows in the forward direction. The voltage dividing resistors R <b> 21 and R <b> 22 divide the voltage on the power supply V <b> 2 side of the second diode D <b> 2 and input the result to the AD port of the CPU 11. The CPU 11 functions as a shutoff detection unit, and detects that the circuit control power source V1 is shut off, that is, a plug omission, based on the voltage input to the AD port.

  Moreover, the alarm device 1 has a known circuit required as an alarm device, such as a sensor for detecting a gas leak, for example.

  Next, the operation of the alarm device 1 configured as described above will be described with reference to FIGS. 2 and 3. Prior to power on (before plugging the AC power supply), the capacitor C is in a non-charged state. When a plug is connected to the AC power supply to turn on the power, the power supply V2 is input to the regulator 15, and the circuit control power supply V1 is output from the regulator 15. The capacitor C is charged by the circuit control power supply V1 output from the regulator 15.

  At this time, the charging current Ic from the circuit control power supply V1 is supplied to the capacitor C via the resistor R1. Further, the power supply of the circuit control power supply V1 starts the CPU 11 to start the initial delay operation shown in FIG. First, the CPU 11 darkens the LED 12 for t1 seconds (for example, 3 seconds) after the power is turned on, and notifies that the setting of the display time of the replacement time limit of the alarm device 1 is being received (step S1). The setting of the display presence or absence of the replacement time limit is to set whether or not to notify when the replacement time limit of the alarm device 1 has passed. The user operates the switch (not shown) of the alarm device 1 for t1 seconds after the power is turned on to set the presence / absence of display of the replacement time limit.

  When t1 seconds have elapsed since the power is turned on (Y in step S2), if display is set (Y in step S3), switching between bright lighting and dark lighting is performed twice (step S4), Informs that it is displayed. On the other hand, if the display non-display is set (N in step S3), the CPU 11 performs switching of bright lighting and dark lighting once after t1 second (step S5), and notifies that the display is not displayed. Do.

  After waiting for t2 seconds (for example, 2 seconds) to elapse after t1 seconds (Y in step S6), the CPU 11 blinks the LED 12 to indicate that the capacitor C is charging (more specifically, dark) Repeatedly turn on and off) (step S7). From this, it is clear that the CPU 11 and the LED 12 correspond to the operating means and the charging notification means. Thereafter, the CPU 11 functions as a determination unit, and determines whether the capacitor C is being charged or has ended based on whether t3 seconds (for example, 15 seconds) have elapsed since the power was turned on (step S8).

  If t3 seconds have not elapsed (N in step S8), the CPU 11 determines that charging is in progress, and continues blinking of the LED 12. On the other hand, if t3 seconds have elapsed (Y in step S8), the CPU 11 determines that the charging is completed, stops the blinking of the LED 12 (step S9), and ends the processing. Thereby, the user can be notified that charging of capacitor C has ended. While performing this initial delay operation, the alarm device 1 does not issue a gas leak alarm.

  Thereafter, when the plug is removed from the AC power supply, the power supply V2 is shut off and the circuit control power supply V1 is also shut off. When the circuit control power supply V1 is shut off, the capacitor C is discharged, and power is supplied from the capacitor C to the CPU 11, the LED 12, and the audio output circuit 14. Therefore, even if the plug is removed, the power supply to the CPU 11 and the audio output circuit 14 can be maintained. Then, the CPU 11 detects that the plug has been disconnected from the voltage between the voltage dividing resistors R21 and R22, controls the audio output circuit 14, and can notify by voice that "Don't remove the plug".

  The discharge current Id from the capacitor C is supplied to the CPU 11, the LED 12, and the audio output circuit 14 through the first diode D1 without passing through the resistor R1.

  According to the first embodiment described above, the CPU 11 notifies that charging is in progress until it is determined that charging is completed. Thereby, the user can grasp the period during which the plug removal notification can not be made, and can urge the user not to pull out the plug during charging. Further, as in the present embodiment, in the alarm device 1 which does not perform the gas leak alarm during charging of the capacitor C, since the timing of charge termination can be grasped, inspection work can be performed promptly after charge termination. , Inspection work is easier to do.

Second Embodiment
Next, the alarm device 1 of the present invention in the second embodiment will be described. The configuration of the alarm device 1 is the same as that of the first embodiment, so the detailed description is omitted here. Next, the operation of the alarm device 1 in the second embodiment will be described with reference to FIG. As in the first embodiment, the capacitor C is not charged before the power is turned on (before the plug is connected to the AC power supply). When the plug is connected to the AC power supply to turn on the power, the capacitor C is charged.

  Further, when the power is turned on, the CPU 11 is activated to start the plug removal notification processing. First, the CPU 11 detects the interruption (plug omission) of the circuit control power supply V1 based on the voltage between the resistors R21 and R22 (step S10). When the plug removal is detected (Y in step S10), the CPU 11 functions as a determination unit, and determines whether the capacitor C is being charged or not based on whether or not t3 seconds have elapsed since the power was turned on (Y). Step S11). If t3 seconds, which is the end of charging, have passed (Y in step S11), the CPU 11 controls the audio output circuit 14 as shown in the right column of Table 1 below and says "Please do not unplug" At the same time, the external output is turned on for 2.5 seconds to notify the gas meter (not shown) that the plug is missing (step S12), and the plug missing notification process is ended.

  On the other hand, while t3 seconds have not elapsed (N in step S11), the CPU 11 determines that charging is in progress, and functions as an operation means and a notification stop means, as shown in the left column of Table 1; The notification is stopped (step S13), the voice is not output, the external output is not turned on, and the plug removal notification process is ended.

  According to the second embodiment described above, when it is determined that charging is in progress when the CPU 11 detects that the power is shut off, the notification of plug omission is stopped. As a result, for example, unstable notification such as interruption of sound halfway is not performed, and therefore the user's sense of anxiety can be wiped out.

  According to the above-described embodiment, the plug omission is notified by voice, but the present invention is not limited to this. The plug removal may be notified using a buzzer, an LED, a display, or the like.

  Moreover, according to the embodiment described above, although the LED 12 is used to notify that charging is in progress, the present invention is not limited to this. You may make it alert | report using an audio | voice or a display.

  Further, according to the above-described embodiment, the CPU 11 determines whether the capacitor C is being charged or charged based on the elapsed time since the power is turned on. However, the present invention is not limited to this. For example, based on the voltage across the capacitor C, it may be determined whether charging is in progress or charging is completed.

  Further, the above-described embodiment only shows a typical form of the present invention, and the present invention is not limited to the embodiment. That is, various modifications can be made without departing from the scope of the present invention.

1 Alarm (electronic equipment)
10 Load 11 CPU (load, operation means, shutoff detection means, notification means, determination means, charge notification means, notification stop means)
12 Light emitting diode (load, charging notification means)
14 Voice output circuit (load, notification means)
C capacitor

Claims (2)

What is claimed is: 1. An electronic device comprising: a load operated by receiving power supply; and a capacitor charged by the power supply,
The load is
Shutoff detection means for detecting shutoff of the power supply;
Notification means for producing a notification by sound indicating that the power supply has been interrupted by receiving supply of discharge current from the capacitor when the interruption of the power supply is detected;
A determination unit that determines whether the capacitor is charging or not after the start of the power supply;
Notification stop means for stopping notification by the notification means when it is determined that charging is being performed by the determination means when interruption of the power supply is detected;
Electronic apparatus, characterized in that it comprises a. The electronic device according to claim 1, characterized by further comprising a charging notification means for notifying a charging until it is determined that the end of charge by the pre-Symbol judging means.

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