JP2002078219A - Power unit and charger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve a problem that a battery deteriorates under a daily charge at a high temperature and a charged amount is reduced, and also to solve a problem that the time for an auxiliary charge meets with the power peak of a day. SOLUTION: A power unit comprises a secondary battery 2 and a charger 1 that in a supplementary fashion charges the secondary battery 2 and holds the secondary battery 2 in a dischargeable condition. The charger 1 comprises a 24-hour timer 7 that stores the time for charging the secondary battery 2 and a charge-control switch 5 that is switched by a charging signal of the 24-hour timer 7. When the time stored in the 24-hour timer 7 arrives, the charge- control switch 5 is turned on and the charger 1 carries out auxiliary charge of the secondary battery 2. The 24-hour timer 7 shifts the time for carrying out auxiliary charge of the secondary battery 2, changing the stored time every day.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a backup power supply which is always kept in a state where power can be supplied,
The present invention relates to a charger that is built in the power supply device and keeps the secondary battery in a state where the secondary battery can always be discharged.

[0002]

2. Description of the Related Art An emergency backup power supply device having a built-in secondary battery needs to supply power when a power failure occurs. If the secondary battery is discharged, power cannot be supplied. Therefore, the capacity corresponding to the self-discharge is supplementarily charged to keep the battery usable. This type of power supply or charger uses a floating nag charging method, in which a charging circuit is constantly connected in parallel with the secondary battery to keep the voltage of the secondary battery constant, and a capacity equivalent to the amount of discharged secondary battery every day. There is an auxiliary charging method. Floatnag charging method
Since the charging circuit is always connected, there is a feature that the charging current can be reduced. However, since the output voltage needs to be stabilized with extremely high accuracy, there is a disadvantage that the charging circuit is expensive. The reason is that if the output voltage is too high, the life of the secondary battery is significantly shortened, whereas if the output voltage is too low, the charging capacity of the secondary battery becomes small, so that sufficient power cannot be output at the time of power failure or the like.

The method of supplementary charging every day has the advantage that the output of the charging circuit does not need to be stabilized, so that the charging circuit can be made simple and low in cost. A charger that charges a secondary battery in this manner includes a 24-hour timer that stores the time of auxiliary charging, and a switching element that is turned on and off by the 24-hour timer. The 24-hour timer outputs a charging signal at the stored time, and the charging signal is input to the switching element, and the switching element is turned on to supplementarily charge the secondary battery. The 24-hour timer switches on the switching element at 2:00 pm, for example, to perform supplementary charging. The switching element is turned off when the auxiliary charging is completed. This charger performs supplementary charging by turning on the switching element for several hours at the same time on a daily basis.

[0004]

In a charger that charges a secondary battery at the same time every day using a 24-hour timer, the charging time does not change every day, so if the time for supplementary charging is set in an undesirable time zone. This causes various adverse effects. For example, in an extreme case, if the battery is installed in a place where summer sunshine hits, supplementary charging may be performed during the daytime when sunshine hits. When used in this environment, the battery is always charged at a high temperature and deteriorates to shorten its life. Also, at high temperatures, the charging efficiency decreases, so that the charging amount substantially decreases,
There is a problem that the battery cannot be maintained in a sufficiently charged state and cannot operate normally in an emergency. Further, when the set time of the 24-hour timer reaches the peak time of the power consumption, there is a problem that the peak power is increased.

[0005] The present invention has been developed for the purpose of solving such a drawback. An important object of the present invention is to shift the time of the supplementary charge every day, thereby causing the disadvantage of supplementary charge at a fixed time, that is, the disadvantage that the battery is charged at a high temperature every day and deteriorates or the charge capacity decreases. It is another object of the present invention to provide a power supply device and a charger that solve the problem that auxiliary charging matches the power peak time of one day.

[0006]

The power supply device of the present invention includes a secondary battery 2 and a charger 1 for supplementarily charging the secondary battery 2 and holding the secondary battery 2 in a dischargeable state. . The charger 1 includes a 24-hour timer 7 that stores a time at which the secondary battery 2 is charged, and a charge control switch 5 that is switched by the charge signal of the 24-hour timer 7. At the time stored in the 24-hour timer 7,
The charge control switch 5 is turned on, and the charger 1 supplementarily charges the secondary battery 2. The 24-hour timer 7 changes the stored time every day to shift the time at which the secondary battery 2 is supplementarily charged.

[0007] The charger 1 can calculate the charged amount from the discharged amount of the secondary battery 2 by the arithmetic circuit 8. This charger 1
When the time stored in the 24-hour timer 7 is reached, the charge control switch 5 is turned on for the charge time corresponding to the charge amount calculated by the arithmetic circuit 8, and the secondary battery 2 is supplementarily charged. The charger 1 can supplementarily charge the secondary battery 2 once a day at the time stored in the 24-hour timer 7.

The battery charger of the present invention supplementarily charges the secondary battery 2 and keeps the secondary battery 2 in a state where it can be discharged at all times. The charger 1 includes a 24-hour timer 7 that stores a time at which the secondary battery 2 is supplementarily charged, and a charging control switch 5 that is switched by a charging signal of the 24-hour timer 7. When the time stored in the 24-hour timer 7 comes, the charge control switch 5 is turned on to supplementarily charge the secondary battery 2.
The 24-hour timer 7 changes the stored time every day to shift the time at which the secondary battery 2 is supplementarily charged.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. However, the embodiment described below exemplifies a power supply device and a charger 1 for embodying the technical idea of the present invention, and the present invention does not specify the power supply device and the charger 1 as follows. .

Further, in this specification, in order to make it easy to understand the claims, the numbers corresponding to the members shown in the embodiments will be referred to as “claims” and “ In the column of “means”.
However, the members described in the claims are not limited to the members of the embodiments.

The power supply device shown in FIG. 1 includes a secondary battery 2 connected to a load, which is a device 3 to be used, for supplying power, and a charger 1 for supplementarily charging the secondary battery 2. Equipment used 3
Is an emergency lamp or the like that is lit by the secondary battery 2 when a power failure occurs. The secondary battery 2 is a rechargeable battery such as a nickel-cadmium battery, a nickel-hydrogen battery, or a lithium ion secondary battery.

The secondary battery 2 self-discharges and reduces its remaining capacity even when no power is supplied to the load. In order to compensate for the decrease in the remaining capacity due to the self-discharge of the secondary battery 2, the charger 1 supplementally charges the capacity corresponding to the self-discharge every day to charge the secondary battery 2 to a predetermined remaining capacity, for example, The battery can be maintained at a full charge or a state of charge close to full charge. The rate at which the self-discharge reduces the remaining capacity of the secondary battery 2 in one day is almost constant. For this reason, the secondary battery 2 can be supplementarily charged with a constant capacity every day and maintained at a predetermined remaining capacity. However, when the ambient temperature where the secondary battery 2 is installed changes, or when the secondary battery 2 is used together with the equipment 3 to be removed from the charger 1, the daily discharge capacity is not always constant. .
In this application, the discharge capacity of the secondary battery 2 is detected,
Supplementary charge of the charge capacity to compensate for the discharged capacity. The used device 3 used by detaching from the charger 1 is, for example, a flashlight or the like used in the event of a power outage, and is used by detaching the charger 1 and turning on a lamp.

The charger 1 is a charging power supply 4 for charging the secondary battery 2 and is connected between the charging power supply 4 and the secondary battery 2 to be turned on when charging the secondary battery 2. It has a charge control switch 5 that can be switched, and a charge control circuit 6 that controls the charge control switch 5 to be turned on and off. The charging power supply 4 is an AC 100
V is converted to a DC voltage that can charge the secondary battery 2.

The charge control switch 5 is a semiconductor switching element such as a transistor or an FET. The charge control switch 5 is turned on when the secondary battery 2 is supplementarily charged, and is turned off when the secondary battery 2 is not charged. The charge control switch 5 in the figure is a transistor. The emitter is connected to the charging power supply 4, the collector is connected to the secondary battery 2, and the base is connected to the charge control circuit 6. The transistor is
It is turned on when an on signal is input from the charge control circuit 6.

The charge control circuit 6 includes a 24-hour timer 7 that stores the time at which the secondary battery 2 is supplementarily charged, and an arithmetic circuit 8 that detects the discharge capacity of the secondary battery 2.

The 24-hour timer 7 stores a time at which the secondary battery 2 is supplementarily charged. The time for supplementary charging of the secondary battery 2 is not the same every day. The 24-hour timer 7 changes the stored time every day to shift the time for supplementary charging of the battery. For example, 24-hour timer 7
Recharges the secondary battery 2 at a time shifted by 1 to 5 hours every day. As shown in FIG. 2, the 24-hour timer 7, which performs supplementary charging at a time shifted by 4 hours every day, has 12:00, 8:00, 4:00,
The secondary battery 2 is supplementarily charged at 0:00, 20:00, and so on at intervals of 20 hours. The 24-hour timer 7 supplementarily charges the secondary battery 2 once a day. However, the secondary battery 2 may be supplementarily charged at a rate of plural times a day, or may be supplemented at a rate of once every two days or more. In the case of supplementary charging several times a day, the 24-hour timer 7 shifts the time of supplementary charging, and in the case of supplementary charging once every two days or more, the 24-hour timer 7 The time for supplementary charging is shifted instead of the same as the previous time.

The arithmetic circuit 8 integrates the discharge current of the secondary battery 2 to calculate the discharge capacity, calculates the remaining capacity from the discharge capacity, and calculates the charge capacity for supplementary charging, that is, the charge time, from the remaining capacity. The charger 1 in which the arithmetic circuit 8 calculates the discharge capacity of the secondary battery 2 and adjusts the charging time has a feature that the secondary battery 2 can always be charged to a predetermined remaining capacity without overcharging the secondary battery 2. Also, when the used equipment 3 is detached from the charger 1 together with the secondary battery 2 and used, the discharge capacity of the secondary battery 2 can be accurately detected and the secondary battery 2 can always be supplementarily charged to a predetermined remaining capacity. There are features. However, when the charger 1 performs supplementary charging for supplementing only the self-discharge of the secondary battery 2 without removing the used device 3 from the charger 1, the arithmetic circuit 8 is not necessarily required, and a fixed decision is made every day. The secondary battery 2 can be supplementarily charged at the set time.

The arithmetic circuit 8 detects the voltage of the secondary battery 2 to detect full charge, and when the charge is full, the charge control switch 5
Can be switched off to control charging to be stopped. This charger 1 has a feature that the secondary battery 2 can be supplementarily charged to a predetermined remaining capacity without overcharging.

In the illustrated charging control circuit 6, when the time stored in the 24-hour timer 7 comes, the 24-hour timer 7 outputs a charging signal. The charge signal is input to the arithmetic circuit 8, and the arithmetic circuit 8 turns on the charge control switch 5. When it is time to finish the supplementary charging of the secondary battery 2, the arithmetic circuit 8
The charge control switch 5 is turned off.

[0020]

The power supply device and the charger according to the present invention have an advantage that the harmful effects of supplementary charging at a predetermined time can be very easily eliminated. It stores the time at which the power supply and the charger of the present invention charge the secondary battery.
The charge control switch is turned on by the charge signal from the time timer to supplementarily charge the secondary battery, and the 24-hour timer changes the stored time every day to perform the supplementary charge of the secondary battery. It is because it has shifted. In the power supply device and the charger having this structure, the time at which the secondary battery is supplementarily charged is changed every day without making the time constant. It is possible to effectively eliminate the disadvantage that the battery is charged at a high temperature and deteriorates or the charging capacity is reduced, and the adverse effect that the auxiliary charging matches the power peak time of one day.

Further, the power supply device according to the second aspect of the present invention and the charger according to the fifth aspect include an arithmetic circuit for calculating the charge amount from the discharge amount of the secondary battery, and the charge amount calculated by the arithmetic circuit. Since the secondary battery is supplementarily charged by turning on the charge control switch only for the charging time corresponding to the above, there is a feature that the secondary battery can always be charged to a predetermined remaining capacity without overcharging.
In particular, when the power device and the charger are used together with the secondary battery from the charger, the power supply device and the charger accurately detect the discharge capacity of the secondary battery and always compensate for the remaining capacity. Can be charged.

[Brief description of the drawings]

FIG. 1 is a block diagram of a power supply device according to an embodiment of the present invention.

FIG. 2 is a timing chart for charging a secondary battery by the power supply device according to the embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Charger 2 ... Secondary battery 3 ... Equipment used 4 ... Charging power supply 5 ... Charge control switch 6 ... Charge control circuit 7 ... 24 hour timer 8 ... Arithmetic circuit

Claims (6)

[Claims] 1. A secondary battery (2) and a charger for supplementarily charging the secondary battery (2) and keeping the secondary battery (2) in a dischargeable state.
(1), the charger (1) is switched by a 24-hour timer (7) storing the time of charging the secondary battery (2), and a charging signal of the 24-hour timer (7). A charge control switch (5), and at the time stored in the 24-hour timer (7), the charge control switch (5) is turned on, and the charger (1) is recharged with the secondary battery (2). A power supply device for supplementarily charging the secondary battery, wherein the time stored in the 24-hour timer (7) is changed every day to shift the time for supplementary charging the secondary battery (2). The battery charger (1) includes a calculation circuit (8) for calculating a charge amount from a discharge amount of the secondary battery (2), and when a time stored in a 24-hour timer (7) is reached, The power supply device according to claim 1, wherein the charge control switch (5) is turned on for a supplementary charge of the secondary battery (2) for a charge time corresponding to the charge amount calculated by the calculation circuit (8). 3. The power supply device according to claim 1, wherein the charger (1) supplementarily charges the secondary battery (2) once a day at a time stored in the 24-hour timer (7). . 4. A charger for supplementarily charging a secondary battery (2) and holding the secondary battery (2) in a dischargeable state, comprising:
(2) 24-hour timer that stores the time of supplementary charging
(7) and a charge control switch (5) that is switched by a charge signal of the 24-hour timer (7), and when the time stored in the 24-hour timer (7) comes, the charge control switch (5) Is switched on to supplementarily charge the rechargeable battery (2). The time stored in the 24-hour timer (7) is changed every day to set the time for supplementarily recharging the rechargeable battery (2). A charger that can be shifted. 5. An arithmetic circuit (8) for calculating the amount of charge from the amount of discharge of the secondary battery (2). When the time stored in the 24-hour timer (7) comes, the arithmetic circuit (8) The charger according to claim 4, wherein the secondary battery (2) is supplementarily charged by turning on the charge control switch (5) for a charging time corresponding to the calculated amount of charge. 6. The battery charger according to claim 4, wherein the secondary battery (2) is supplementarily charged once a day at a time stored in the 24-hour timer (7).