JP2000350382A - Backup power supply circuit with discharge function - Google Patents

Abstract

PROBLEM TO BE SOLVED: To achieve full discharge of a photocell for preventing memory effect by equipping two systems of rechargeable batteries and switching one chargeable battery to the backup of a body power supply and the other rechargeable battery to full discharging. SOLUTION: When the movable piece of a switch 13 is switched to the side of a fixed terminal 13a, and the movable piece of a switch 14 is switch 14 is switched to the side of a fixed terminal 14a, a rechargeable battery 11 is connected to a charger 16 with a discharge function for discharging. Then, when discharging is completed, charging is made. A rechargeable battery 13 is connected to a body power supply 17 and functions as the backup power supply of the body power supply 17. Then, when the movable piece of the switch 13 is switched to the side of a fixed terminal 13b and that of the switch 14 is switched to a fixed terminal 14b, the rechargeable battery 11 is connected to the body power supply 17 and function as the backup power supply of the body power supply 17. Also, a rechargeable battery 12 is connected to the charger 16 with a discharge function for discharging, and charging is made when the discharging is completed.

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 circuit having a discharge function, and more particularly to a backup power supply circuit having a discharge function capable of completely discharging a rechargeable battery.

[0002]

2. Description of the Related Art Conventionally, there has been known a backup power supply circuit using a secondary battery (rechargeable battery) which can be charged and used repeatedly instead of a non-rechargeable primary battery.

A nickel-cadmium storage battery mainly used as a rechargeable battery has a memory effect, which causes a reduction in charge capacity and a shortened life of the rechargeable battery when the battery is recharged without being completely discharged after being charged. I have.

[0004]

However, the conventional backup power supply circuit using a rechargeable battery repeatedly discharges when the power supply of the main body is cut off and recharges the battery before the battery is not completely discharged. In some cases, the battery does not function as a backup power supply after being used for a long time.

It is an object of the present invention to provide a backup power supply circuit with a discharge function which enables a complete discharge of a rechargeable battery without generating a memory effect.

[0006]

In order to achieve the above object, a backup power supply circuit with a discharge function according to the present invention is a backup power supply circuit with a discharge function for backing up a main body power supply using a rechargeable battery. Equipped with a rechargeable battery, one rechargeable battery as a backup for the main unit power supply,
It is characterized in that the other rechargeable battery is switched to complete discharge.

[0007] With the above configuration, in a backup power supply circuit with a discharge function for backing up the main body power supply using a rechargeable battery, two rechargeable batteries are provided,
One rechargeable battery is switched to a backup of the main body power supply, and the other rechargeable battery is switched to full discharge. As a result, it is possible to completely discharge the rechargeable battery without causing the memory effect.

[0008]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a circuit diagram of a backup power supply circuit with a discharge function according to an embodiment of the present invention. As shown in FIG. 1, a backup power supply circuit 10 having a discharge function is provided.
Has a switch unit 15 composed of rechargeable batteries 11 and 12 of two systems, switches 13 and 14 of two circuits and two contacts, and a charger 16 with a discharge function.

The negative poles of the rechargeable batteries 11 and 12 are respectively connected to ground, and the positive pole of the rechargeable battery 11 is connected to the fixed terminal 13a of the switch 13 and the fixed terminal 14b of the switch 14. The positive pole of the rechargeable battery 12 is
The fixed terminal 13b of the switch 13 and the fixed terminal 14a of the switch 14 are connected. The fixed terminal 13c of the switch 13 is connected to the charger 16 with a discharging function, and the fixed terminal 14c of the switch 14 is connected to the main body power supply 17.

In the backup power supply circuit with a discharging function 10 having the above configuration, first, the movable piece of the switch 13 is switched to the fixed terminal 13a side, and the movable piece of the switch 14 is switched to the fixed terminal 14a side. Since it is connected to the charger 16 with a discharging function, it is discharged, and when the discharging is completed, charging is performed. The rechargeable battery 12 has a main body power supply 17.
And functions as a backup power supply for the main body power supply 17.

Next, the movable piece of the switch 13 is connected to the fixed terminal 1.
When the movable piece of the switch 14 is switched to the fixed terminal 14a side on the 3b side, the rechargeable battery 11 is connected to the main body power supply 17 and functions as a backup power supply for the main body power supply 17,
The rechargeable battery 12 is discharged because it is connected to the charger 16 with a discharging function, and is charged when the discharging is completed.

As described above, according to the present invention, the rechargeable battery can be completely discharged without causing a memory effect.
Two rechargeable batteries 11 and 12 are built in, and when one rechargeable battery is performing backup or standby standby of the power supply of the electronic device, the other rechargeable batteries are completely discharged. By switching between the two rechargeable batteries 11 and 12, backup of the main power supply 17 and complete discharge of the rechargeable batteries can be alternately performed.

That is, the backup power supply circuit 10 with a discharge function can prevent the function of the backup power supply from functioning as a backup power supply after being used for a long time due to the memory effect, and can prevent the loss of the rechargeable battery.

In the above embodiment, the manual switch switching (see FIG. 1) has been described. However, the timer operation or the program control operation can be performed by replacing the switch with a relay or an electronic switch.

[0016]

As described above, according to the present invention, in a backup power supply circuit having a discharge function for backing up a main body power supply using a rechargeable battery, two rechargeable batteries are provided. Since the other rechargeable battery is switched to full discharge for backup of the main body power supply, it is possible to completely discharge the rechargeable battery without causing a memory effect.

[Brief description of the drawings]

FIG. 1 is a circuit diagram of a backup power supply circuit with a discharge function according to an embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Backup power supply circuit with discharge function 11, 12 Rechargeable battery 13, 14 Switch 13a, 13b, 13c Fixed terminal 14a, 14b, 14c Fixed terminal 15 Switch section 16 Charger with discharge function 17 Main power supply

Claims (6)

[Claims] 1. A backup power supply circuit having a discharge function for backing up a main body power supply using a rechargeable battery, comprising two systems of rechargeable batteries, one of which is used as a backup of the main body power supply and the other is completely discharged. A backup power supply circuit with a discharge function, characterized by switching to 2. The backup power supply circuit with a discharge function according to claim 1, wherein when one of the rechargeable batteries is used for backing up the power supply of the main body, the other rechargeable battery is completely discharged. 3. The method according to claim 2, wherein the two rechargeable batteries are switched.
The backup power supply circuit with a discharge function according to claim 1 or 2, further comprising a switch unit including a switch having two contacts of the circuit. 4. The backup power supply circuit with a discharge function according to claim 3, wherein said switch section switches between said two systems of rechargeable batteries alternately. 5. The switch unit according to claim 1, wherein one rechargeable battery is connected to a charger having a discharging function, and the other rechargeable battery is connected to a main body power supply. 5. The backup power supply circuit with a discharge function according to claim 4, wherein the backup power supply circuit with a discharge function is switched to a state of being connected to a charger with a discharge function. 6. The backup power supply circuit with a discharge function according to claim 3, wherein the switch section performs a timer operation, a program control operation, and the like of the switch.