JP2009258067A - Battery voltage sag detecting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a battery voltage sag detecting device capable of communicating battery voltage sag to users reliably. <P>SOLUTION: The battery voltage sag detecting device includes a preliminary alarm means (7) performing preliminary alarm announcing battery voltage sag during a predetermined preliminary alarm period, when, by comparing the battery voltage a dummy load is connected to a battery and dummy load current is flowed with a first battery voltage sag detection threshold, the battery voltage sag is detected where battery voltage is less than the first battery voltage sag detection threshold and a real alarm means (10) performing real alarm detecting battery voltage sag after the preliminary alarm duration pass over, and also includes a decision means (2) for deciding whether transitional period after power activation is within a predetermined period and a controlling means (2) forcing the real alarm means to perform real alarm immediately according to detection of battery voltage sag when the decision means (2) decides it to be within the predetermined period. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a battery voltage drop detection device.

  Battery-powered alarms such as gas alarms and fire alarms need to notify the user of battery voltage drop (battery exhaustion) reliably and have the product or battery replaced. In this case, in order for the user to be surely aware of the battery voltage drop, it is necessary to provide a notification for a certain period of time using a display such as an LED or an alarm sound such as a sound. Therefore, even after the battery voltage is lowered, a sufficient battery capacity is required to perform LED display and sound alarm only for a predetermined period (see, for example, Patent Document 1).

  FIG. 5 is a flowchart showing an example of the operation of the conventional battery voltage drop detection device. The battery voltage drop detection device is incorporated in, for example, a battery-type fire alarm device, and determines whether or not 25 hours have passed by the built-in timer during fire monitoring (standby) (step S51) (step S53). If it has elapsed, the pseudo load resistance is connected to the battery, and a pseudo load pulse current equal to or greater than the maximum actual load is passed (step S55).

  Then, the battery voltage at that time is measured (step S57). Next, it is determined whether or not the measured battery voltage is equal to or lower than the battery voltage drop detection threshold Vth1 (step S59). If the battery voltage is not lower than the battery voltage drop detection threshold Vth1, the process returns to step S51. If the battery voltage is equal to or lower than the battery voltage drop detection threshold Vth1, the battery voltage drop is detected. Therefore, the LED (light emitting diode) is immediately blinked to display the battery voltage drop notification. (Step S61).

  Thereafter, it is determined whether or not a preset display period (for example, two weeks) has elapsed (step S63). If not, the process returns to step S61 to continue the LED display. If the display period elapses, an alarm sound is then generated by a buzzer or a speaker (step S65).

  FIG. 6 is a graph showing the discharge load characteristics of the battery. In discharge load characteristics, it is generally known that the battery voltage decreases as the environmental temperature decreases and the discharge current increases. In FIG. 6, the battery voltage at room temperature of the battery is 3V, 2.6V is the battery voltage drop detection threshold Vth1, 2.4V is the minimum operating voltage Ve of the alarm, and the pseudo load pulse current is 100 mA.

  In FIG. 6, the battery base voltage during standby (when the pseudo load is not connected) at the environmental temperature of + 23 ° C. and the pulse voltage at + 23 ° C., 0 ° C. and −10 ° C. (the battery battery when the pseudo load resistor is connected) The change in voltage is shown. In this case, when a battery voltage drop is detected at −10 ° C., there is a battery capacity of about 270 mAh before the battery voltage drops to the lowest operating voltage Ve (2.4 V), and when detected at + 23 ° C. The battery capacity is about 100 mAh.

These 270 mAh and 100 mAh are battery capacities required to cause a battery voltage drop alarm by LED display or sound until the battery voltage drop is detected at each environmental temperature and before the voltage drops to the minimum operating voltage Ve. That is, in the battery voltage drop detection device, during the battery voltage drop detection operation, the alarm possible time during which the alarm can be performed from the battery voltage drop detection to the minimum operating voltage is affected by the change in the environmental temperature, and the environmental temperature rises As it gets shorter.
JP 2006-201904 A

  However, in the above-described battery voltage drop detection device, when the current consumption increases due to a circuit failure or the like, the battery voltage drop detection is detected earlier than the design specification, and a predetermined period (for example, two weeks) after the battery voltage drop is detected. There is a possibility that the battery voltage drops to the minimum operating voltage or less before the lapse of time, the alarm sound cannot be generated without the user's knowledge, and the battery voltage drop cannot be reliably notified to the user.

  In view of the above-described problems, an object of the present invention is to provide a battery voltage drop detection device that can reliably notify a user of a battery voltage drop.

  In order to solve the above-mentioned problem, the invention according to claim 1 compares a battery voltage when a pseudo load is connected to a battery and a pseudo load current flows, and a first battery voltage drop detection threshold value. Battery voltage drop detecting means for detecting a battery voltage drop when the battery voltage is equal to or lower than the first battery voltage drop detection threshold, and a battery voltage drop detected by the battery voltage drop detecting means. A battery comprising: a preliminary alarm means for performing a preliminary alarm for notifying a battery voltage drop when a predetermined warning period is issued; and a main alarm means for performing a main alarm for notifying a battery voltage drop after the preliminary alarm period has elapsed. A voltage drop detection device, wherein when the battery voltage drop is detected by the battery voltage drop detection means, determination means for determining whether or not an elapsed period from power-on is within a predetermined period, and the battery voltage drop detection When the battery voltage drop is detected by the stage, if it is determined by the determination means that it is within a predetermined period, the control means for causing the alarm to immediately perform the alarm without waiting for the preliminary alarm period to elapse, It exists in the battery voltage drop detection apparatus characterized by having.

  According to a second aspect of the present invention, the battery voltage drop detection unit is set to intermittently perform the detection operation, and the control unit is performed after the power is turned on or after the shipment mode is released. When a battery voltage drop is detected as a result of the first detection operation, the alarm is performed by the alarm unit after the preliminary alarm by the auxiliary alarm unit regardless of the determination by the determination unit. The battery voltage drop detection device according to claim 1, wherein

  According to a third aspect of the present invention, the battery voltage when the pseudo load is connected to the battery and the pseudo load current is passed is compared with the first battery voltage drop detection threshold, and the battery voltage is the first voltage. A battery voltage drop detection means for detecting a battery voltage drop when the battery voltage drop detection threshold value is below the threshold value, and a battery voltage drop notification when the battery voltage drop is detected by the battery voltage drop detection means A battery voltage drop detection device comprising: a preliminary warning means for performing a preliminary warning during a predetermined preliminary warning period; and a main warning means for performing a main warning for notifying a battery voltage drop after the preliminary warning period has elapsed, When a battery voltage drop is detected by the battery voltage drop detection means, a determination means for determining whether the elapsed period from power-on is within a predetermined period, and when the determination means determines that the battery voltage drop is within a predetermined period, Said It exists and threshold changing means in place of the battery voltage detection threshold to change to a higher second battery voltage drop detection threshold it, to have a battery voltage drop detecting device according to claim.

  According to a fourth aspect of the present invention, the preliminary alarm means is a display means for displaying a battery voltage drop notification, and the alarm means is an alarm sound generating means for notifying the battery voltage drop with an alarm sound. It exists in the battery voltage drop detection apparatus of any one of Claims 1-3 characterized by these.

  As described above, according to the first aspect of the present invention, when a battery voltage drop is detected within a predetermined period from the insertion of the battery, this alarm is immediately generated. Even if it increases, it is possible to reliably notify the user of the battery voltage drop by this alarm.

  According to the second aspect of the present invention, even if a battery voltage drop test is performed in which a consumed battery is mounted and a battery voltage drop detection alarm operation is confirmed, a battery voltage drop is detected after a predetermined period of time has elapsed since the power was turned on. As in the case where the alarm is issued, the alarm is generated in the order of the preliminary alarm and the main alarm, and the pass evaluation can be obtained without hesitation in the battery voltage drop test. Also, if a battery voltage drop is detected when the contractor installs an alarm device equipped with this battery voltage drop detection device and cancels the shipment mode, the battery voltage drop is notified to the contractor with a preliminary warning. Since this alarm does not occur, the user (household) will not feel uneasy or distrustful.

  According to the third aspect of the present invention, when the battery voltage drop is detected within a predetermined period after the power is turned on, the battery voltage drop detection threshold value is changed to a high value. Even when the battery voltage increases, the battery voltage drop can be reliably notified to the user by the preliminary alarm and the main alarm.

  According to the fourth aspect of the present invention, it is possible to reliably notify the user of the battery voltage drop by using the alarm display as the preliminary alarm and the alarm sound as the main alarm.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(First embodiment)
FIG. 1 is a block diagram showing a configuration example of a battery voltage drop detection device of the present invention. In FIG. 1, the battery voltage drop detection device is incorporated in, for example, a battery-type fire alarm, and includes a CPU 2, a pnp transistor 3, a pseudo load resistor 4, a pnp transistor 6, an LED 7, and a resistor 8 connected to the battery 1. , A pnp transistor 9 and a buzzer 10 are provided.

  The CPU 2 is connected to the battery 1 and obtains an operating power supply and performs battery voltage drop detection. The emitter of the pnp transistor 3 is connected to the battery 1, the collector is grounded via the pseudo load resistor 4, and the base is connected to the CPU 2. The emitter of the pnp transistor 6 is connected to the battery 1, the collector is grounded via the LED 7 and the resistor 8, and the base is connected to the CPU 2. The emitter of the pnp transistor 9 is connected to the battery 1, the collector is grounded via a buzzer 10, and the base is connected to the CPU 2.

  Although not shown in the figure, the CPU 2 performs a predetermined interval (for example, 25 hours in this embodiment) and a storage means such as a ROM for storing a control program and a RAM for storing data generated during the processing, and the like. Built-in timer that counts the time for

  The CPU 2 controls the pseudo load current to flow through the battery 1 in a pulse manner every 25 hours counted by the built-in timer, shifts the battery voltage drop detection timing by 1 hour every day, and takes 24 hours a day for 25 days. The battery voltage drop is detected at different times for each hour.

  The battery voltage drop detection operation in the first embodiment of the battery voltage drop detection apparatus having such a configuration will be described with reference to the flowchart of FIG. During the fire monitoring (standby) (step S1), the CPU 2 determines whether or not 25 hours have passed by the built-in timer (step S3). If it has elapsed, the pnp transistor 3 is turned on. The pseudo load resistor 4 is connected to the battery 1 and a pseudo load pulse current equal to or greater than the maximum actual load is passed (step S5). The value of the current flowing through the pseudo load resistor 4 is set to a value operable as an alarm device for a considerable period (for example, three weeks) even after the battery voltage drop is detected.

  Then, the battery voltage at that time is measured (step S7). Next, it is determined whether or not the measured battery voltage is equal to or lower than the battery voltage drop detection threshold Vth1 (step S9). If the battery voltage is not lower than the battery voltage drop detection threshold Vth1, the process returns to step S1. If the battery voltage is equal to or lower than the battery voltage drop detection threshold Vth1, it means that the battery voltage drop has been detected. Next, the CPU 2 functions as a determination means, and has elapsed since the fire alarm was turned on. It is determined whether or not the period is within a predetermined period (step S11). The predetermined period is shorter than an expected period (for example, 8 years) from the power-on to the battery voltage drop detection expected in the case of current consumption during normal operation, and an increase in current consumption due to circuit failure is expected. In this case, a period (for example, one year) from the power-on expected to the battery voltage drop detection is set.

  If not within the predetermined period, the CPU 2 outputs a low-level output voltage to the pnp transistor 6 to turn on the transistor 6, and causes a pulse current to flow through the LED 7 and the resistor 8. Thereby, LED7 blinks and the battery voltage drop is displayed (step S13). Thereafter, it is determined whether or not a preset display period (for example, two weeks) has elapsed (step S15). If not, the process returns to step S13, and the LED blinking display is continued. That is, the LED 7 is a display unit that functions as a preliminary alarm unit that notifies the battery voltage drop by display. If the display period (for example, two weeks) has elapsed, the CPU 2 outputs a low-level output voltage to the transistor 9 to turn on the transistor 9, operate the buzzer 10, and generate an alarm sound (step S17). ). In other words, the buzzer 10 is an alarm sound generating means that functions as a main alarm means for notifying a battery voltage drop with an alarm sound.

  On the other hand, if the elapsed time from the power-on of the fire alarm is within a predetermined period, the CPU 2 functions as a control means, immediately outputs a low level output voltage to the transistor 9 and turns on the transistor 9, and this alarm The buzzer 10 as means is operated to generate an alarm sound (step S17).

  As described above, according to the present embodiment, when the battery voltage drop detection is not within the predetermined period, first, a preliminary warning by display is generated for a predetermined display period, and then this alarm is generated by an alarm sound. When the voltage drop detection is within the specified period, the alarm sound, which is the main alarm, will be generated immediately, resulting in an increase in current consumption due to circuit failure, etc., leading to battery voltage drop detection earlier than the design specification. Even in this case, it is possible to reliably notify the user of the battery voltage drop. Furthermore, when the battery voltage drop is detected earlier than the design specification, a circuit failure (current increase) can be detected.

(Second Embodiment)
Next, a second embodiment of the present invention will be described. In the first embodiment described above, when the battery voltage drop is detected within a predetermined period, the preliminary alarm is omitted and this alarm is immediately performed. In the second embodiment, If the battery voltage drop is detected within the predetermined period, the battery voltage drop threshold is changed to a higher value than when the battery voltage drop threshold is not detected within the predetermined period. The battery voltage drop can be notified.

  The battery voltage drop detection operation in the second embodiment will be described with reference to the flowchart of FIG. During the fire monitoring (standby) (step S21), the CPU 2 determines whether or not 25 hours have elapsed by the built-in timer (step S23). The resistor 4 is connected to the battery 1 and a pseudo load pulse current equal to or greater than the maximum actual load is passed (step S25). The value of the current flowing through the pseudo load resistor 4 is set to a value operable as an alarm device for a considerable period (for example, three weeks) even after the battery voltage drop is detected.

  Then, the CPU 2 measures the battery voltage at that time (step S27). Next, the CPU 2 determines whether or not the elapsed period from when the fire alarm is turned on is within a predetermined period (for example, one year) (step S29).

  If it is not within the predetermined period (for example, if more than one year has elapsed), it is determined whether or not the measured battery voltage is equal to or lower than the first battery voltage drop detection threshold Vth1 ( Step S31). If the battery voltage is not less than or equal to the first battery voltage drop detection threshold Vth1, the process returns to step S21. If the battery voltage is equal to or lower than the first battery voltage drop detection threshold Vth1, the battery voltage drop is detected. Therefore, the CPU 2 outputs a low-level output voltage to the transistor 6 to output the transistor 6 Is turned on, and a pulse current is passed through the LED 7 and the resistor 8. Thereby, LED7 blinks and a battery voltage drop is displayed (step S33). Thereafter, it is determined whether or not a preset display period (for example, two weeks) has elapsed (step S35). If not, the process returns to step S33, and the LED blinking display is continued. If the display period (for example, 2 weeks) has elapsed, the CPU 2 outputs a low-level output voltage to the transistor 9 to turn on the transistor 9, operate the buzzer 10, and generate an alarm sound (step S37). ).

  On the other hand, if it is within a predetermined period (for example, within one year), the CPU 2 determines that the measured battery voltage is higher than the first battery voltage drop detection threshold Vth1 and is set in advance. It is determined whether or not the drop detection threshold value Vth2 is below (step S39). If the battery voltage is not less than or equal to the second battery voltage drop detection threshold Vth2, the process returns to step S21. If the battery voltage is less than or equal to the second battery voltage drop detection threshold Vth2, it means that a battery voltage drop has been detected, so the process proceeds to steps S33 to S37, where an alarm display by the LED 7 and an alarm by the buzzer 10 are displayed. A battery voltage drop is notified by sound generation. Note that the second battery voltage drop threshold value Vth2 is an LED display and a warning for a considerable period (for example, 3 weeks) from the time of battery voltage drop detection even when there is an increase in current due to a failure or the like. The value is set so that sound can be generated.

  Thus, according to this embodiment, if the battery voltage is not within the predetermined period, it is compared with the normal first battery voltage detection threshold, and if it is within the predetermined period, the normal first battery voltage detection is performed. Since the second battery voltage drop detection threshold value that is higher than the threshold value is changed and compared, the current consumption increases due to a circuit failure or the like within a predetermined period, and the battery voltage drop detection is detected earlier than expected. Even in the event that the battery voltage reaches the minimum operating voltage Ve from the time when the battery voltage is detected, the preliminary alarm by display and the main alarm by alarm sound can be generated. Can be notified.

(Third embodiment)
Next, a third embodiment of the present invention will be described. In the first embodiment described above, when a battery voltage drop is detected within a predetermined period after the battery is inserted, the preliminary alarm is omitted and this alarm is immediately issued. However, it has been found that the following problems occur in the battery-type fire alarm incorporating the battery voltage drop detection device as shown in the first embodiment.

  The battery-type fire alarm incorporating the above-described battery voltage drop detection device is subjected to a battery voltage drop detection test for confirming whether or not a preliminary alarm and a main alarm are generated according to the battery voltage drop before shipment. The battery voltage drop detection test is performed by connecting a load resistor to the battery to intentionally deplete the battery to create a battery with a lowered voltage, and mounting the battery on the battery fire alarm. As a worker who performs the battery voltage drop detection test, naturally, a preliminary warning (LED 7 blinking) is first followed by a preset display period, and then this alarm (LED 7 blinking + alarm sound) is expected to occur. .

  However, when the battery-type fire alarm of the first embodiment is loaded with a battery whose battery voltage has dropped in advance and a battery voltage drop detection test is performed, it is determined that the battery voltage drop has been detected within a predetermined period from the insertion of the battery. Then, the preliminary alarm (LED 7 blinking) is omitted and this alarm (LED 7 blinking + alarm sound) is immediately generated. Therefore, the worker who performs the battery voltage drop detection test has a problem that he / she is worried about whether or not to accept this operation. As an operator who performs a battery voltage drop detection test, even if a battery voltage drop detection test is carried out by mounting a battery with a lowered battery voltage in advance, the battery voltage drop occurs when used in a normal state for a predetermined period or longer. I would like to make a pass / fail judgment by confirming similar alarm actions.

  It has also been found that the following problems occur in the battery-type fire alarm as shown in the first embodiment. The battery fire alarm is set in a shipping mode with a personal computer or the like with a battery connected. At this time, if there is a malfunction in the wiring board built in the battery fire alarm and the battery is exhausted in a short period of time, if the contractor installs it at home and cancels the shipping mode, The battery type alarm shown in the first embodiment omits the preliminary alarm (LED 7 blinking) and immediately generates this alarm (LED 7 blinking + alarm sound).

  As a result, a warning sound indicating battery suddenly sounds at the time of installation, and if the contractor replaces it with another battery type fire alarm, the user may happen to see it and feel anxiety and distrust. is there. Therefore, in this third embodiment, when the battery voltage drop is detected by the first battery voltage measurement performed after power-on and after the shipment mode is released, even if within a predetermined period from power-on, This warning is made after the preliminary warning is given.

  The battery voltage drop detection operation in the third embodiment will be described with reference to the flowchart of FIG. The CPU 2 starts a battery voltage drop detection operation in response to battery insertion or release of the shipping mode, controls the transistor 3 to be on, connects the pseudo load resistor 4 to the battery 1, and is equal to or more than the maximum actual load. A load pulse current is passed (step S71). The value of the current flowing through the pseudo load resistor 4 is set to a value operable as an alarm device for a considerable period (for example, three weeks) even after the battery voltage drop is detected.

  Then, the CPU 2 measures the battery voltage at that time (step S72). Next, the CPU 2 determines whether or not the measured battery voltage is equal to or lower than the battery voltage drop detection threshold value Vth1 (step S73). If the battery voltage is equal to or lower than the battery voltage drop detection threshold Vth1, it means that the battery voltage drop has been detected. Next, the CPU 2 outputs the low level output voltage of the pnp transistor 6 to output the transistor 6 is turned on, and a pulse current is passed through the LED 7 and the resistor 8. Thereby, LED7 blinks and the battery voltage drop is displayed (step S74).

  Thereafter, it is determined whether or not a preset display period (for example, two weeks) has elapsed (step S75). If not, the process returns to step S74, and the LED blinking display is continued. If the display period (for example, 2 weeks) has elapsed, the CPU 2 outputs a low-level output voltage to the transistor 6 to turn on the transistor 9, and operates the buzzer 10 to generate an alarm sound (step S76). ).

  On the other hand, if the battery voltage is not lower than the battery voltage drop detection threshold Vth1, after fire monitoring is performed (step S77), it is determined whether or not 25 hours have passed by the built-in timer ( Step S78). When the CPU 2 determines that 25 hours have elapsed by the built-in timer, the transistor 2 is turned on to connect the pseudo load resistor 4 to the battery 1 and to flow a pseudo load pulse current equal to or greater than the maximum actual load (step) S79).

  Then, the CPU 2 measures the battery voltage at that time (step S80). Next, the CPU 2 determines whether or not the measured battery voltage is equal to or lower than the battery voltage drop detection threshold value Vth1 (step S81). If the battery voltage is not lower than the battery voltage drop detection threshold Vth1, the process returns to step S77.

  If the battery voltage is equal to or lower than the battery voltage drop detection threshold Vth1, the battery voltage drop has been detected, so the CPU 2 next determines that the elapsed time since the power-on of the fire alarm is a predetermined period ( For example, it is determined whether or not it is within one year (step S82). Since the predetermined period is set in the same manner as in the first embodiment, detailed description thereof is omitted here.

  If not within the predetermined period, the CPU 2 outputs a low-level output voltage of the pnp transistor 6 to turn on the transistor 6, and causes a pulse current to flow through the LED 7 and the resistor 8. Thereby, LED7 blinks and a battery voltage drop is displayed (step S83). Thereafter, it is determined whether or not a preset display period (for example, two weeks) has elapsed (step S84). If not, the process returns to step S83, and the LED blinking display is continued. If the display period (for example, two weeks) has elapsed, the CPU 2 outputs a low level output voltage to the transistor 6 to turn on the transistor 9, and operates the buzzer 10 to generate an alarm sound (step S85). ).

  On the other hand, if the elapsed time from the power-on of the fire alarm is within a predetermined period, the CPU 2 immediately outputs a low-level output voltage to the transistor 9 to turn on the transistor 9 and turn on the buzzer 10 as an alarm means. Operate to generate an alarm sound (step S85).

  As described above, according to the present embodiment, when the battery voltage drop is detected by the result of the first battery voltage measurement operation performed after the CPU 2 is turned on or after the shipment mode is released, it is within a predetermined period. Regardless of whether or not it is determined, this alarm is set after the preliminary alarm is set. Therefore, even if a battery voltage drop test is performed to check the battery voltage drop detection alarm operation when a consumed battery is installed, a preliminary warning is issued in the same way as when a battery voltage drop is detected after a predetermined period of time has elapsed since the power was turned on. In this order, the alarms occur, and the battery voltage drop test can be evaluated without fail. Also, if a battery voltage drop is detected when the contractor installs an alarm device equipped with this battery voltage drop detection device and cancels the shipment mode, the battery voltage drop is notified to the contractor with a preliminary warning. Since this alarm does not occur, the user (household) will not feel uneasy or distrustful.

  As mentioned above, although embodiment of this invention was described, this invention is not limited to this, A various deformation | transformation and application are possible.

  For example, in the above-described embodiment, the case where the battery voltage drop detection device of the present invention is applied to a fire alarm device has been described. However, the present invention is not limited to this, and can be applied to other alarm devices and other devices. .

  Further, the above-described embodiments are merely representative forms of the present invention, and the present invention is not limited to the embodiments. That is, various modifications can be made without departing from the scope of the present invention.

It is a block diagram which shows the structural example of the battery voltage fall detection apparatus of this invention. (First embodiment) It is a flowchart explaining the battery voltage fall detection operation | movement in 1st Embodiment of the battery voltage fall detection apparatus of this invention. (First embodiment) It is a flowchart explaining the battery voltage fall detection operation | movement in 2nd Embodiment of the battery voltage fall detection apparatus of this invention. (Second Embodiment) It is a flowchart explaining the battery voltage fall detection operation | movement in 3rd Embodiment of the battery voltage fall detection apparatus of this invention. (Third embodiment) It is a flowchart explaining the battery voltage fall detection operation | movement in the conventional battery voltage fall detection apparatus. (Conventional example) It is a graph which shows the discharge load characteristic of a battery.

Explanation of symbols

1 battery 2 CPU (determination means, control means, threshold value changing means)
4 Pseudo load resistance 7 LED (display means, preliminary alarm means)
10 Buzzer (alarm sound generating means, this alarm means)

Claims (4)

A battery voltage when a pseudo load is connected to the battery and a pseudo load current is passed is compared with a first battery voltage drop detection threshold value, and the battery voltage becomes the first battery voltage drop detection threshold value. A battery voltage drop detecting means for detecting a battery voltage drop when the battery voltage drop is detected by the battery voltage drop detecting means when a battery voltage drop is detected by the battery voltage drop detecting means. A battery voltage drop detection device comprising: preliminary warning means for a period of time; and this warning means for performing a warning for notifying a battery voltage drop after the preliminary warning period has elapsed,
A determination unit that determines whether or not an elapsed period from power-on is within a predetermined period when a battery voltage drop is detected by the battery voltage drop detection unit;
When the battery voltage drop is detected by the battery voltage drop detection means, if the judgment means judges that it is within a predetermined period, the warning means immediately issues the warning without waiting for the preliminary warning period to elapse. Control means
A battery voltage drop detection device comprising: The battery voltage drop detection means is set to intermittently perform the detection operation,
When the control means detects a battery voltage drop as a result of the first detection operation performed after the power is turned on or after the shipment mode is released, the preliminary alarm means regardless of the determination by the determination means The battery voltage drop detection device according to claim 1, wherein the battery voltage drop detection device is set to perform the main alarm by the main alarm means after the preliminary alarm is performed. A battery voltage when a pseudo load is connected to the battery and a pseudo load current is passed is compared with a first battery voltage drop detection threshold value, and the battery voltage becomes the first battery voltage drop detection threshold value. A battery voltage drop detecting means for detecting a battery voltage drop when the battery voltage drop is detected by the battery voltage drop detecting means when a battery voltage drop is detected by the battery voltage drop detecting means. A battery voltage drop detection device comprising: preliminary warning means for a period of time; and this warning means for performing a warning for notifying a battery voltage drop after the preliminary warning period has elapsed,
A determination unit that determines whether or not an elapsed period from power-on is within a predetermined period when a battery voltage drop is detected by the battery voltage drop detection unit;
Threshold value changing means for changing to a higher second battery voltage drop detection threshold value instead of the first battery voltage drop detection threshold value when it is judged by the judging means to be within a predetermined period; ,
A battery voltage drop detection device comprising: The preliminary warning means is a display means for performing display for notifying a battery voltage drop,
The battery voltage drop detection device according to any one of claims 1 to 3, wherein the alarm means is an alarm sound generating means for notifying a battery voltage drop with an alarm sound.

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