JP2534485Y2 - Battery-powered power supply - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Purpose of the Invention] (Industrial Field of Application) The present invention relates to a battery-powered power supply device incorporated in a small portable electronic device such as a laptop computer.

(Prior art) Many of these types of small electronic devices can be operated with either a built-in battery or a commercial AC power supply, and some incorporate a secondary battery and a circuit that charges it from an AC power supply. Some use both a primary battery and an AC power supply.

(Problems to be solved by the invention) For devices such as computers and word processors, if the power is turned off without going through a certain procedure, the data will be lost or it will be very troublesome to restore to the original state. Causes inconvenience. When running on internal batteries, care must be taken to ensure that the power does not suddenly turn off due to battery exhaustion.

In the above-described secondary battery type, since the battery capacity is relatively small, there is concern that an AC power source is not close to the battery so that it can be charged at any time. In this regard, the primary battery type has a larger battery capacity, and a spare battery for replacement can be prepared, so it is safe. However, to replace the battery while continuing to operate, AC power is required.In places where there is no AC power, the battery is cut off after a certain procedure before the battery is completely exhausted, and the battery is replaced in that state Will do.
Here, there is a problem that a series of input operations required for a procedure of temporarily suspending operation, turning off the power, replacing the battery, and then resuming the operation is troublesome.

The present invention has been made in view of the above-described conventional circumstances, and its purpose is to allow a battery to be replaced while a system such as a computer (power supply target) is operated without the help of an AC power supply. To provide a battery-type power supply device.

[Structure of the invention] (Means for solving the problem) In order to achieve the above object, the invention is directed to a first battery and a second battery that supply operating power to the same power supply target, and the first battery. A first switch connecting the power supply target,
A second switch connecting the second battery and the power supply target; and a second switch connecting the first battery to the power supply target when a voltage of the first battery becomes equal to or lower than a first threshold value during power supply to the power supply target. Means for turning on both switches of the first battery and the switch of the second battery for a predetermined time and then turning off the switch of the first battery; When the voltage of the second battery falls below a second threshold value lower than the first threshold value after the voltage falls below the threshold value, the switch of the first battery and the second battery are turned off. Means for turning on both switches of the battery switch for a predetermined time and then turning off the switch of the second battery.

(Operation) In the above configuration, the battery-type power supply device according to the present invention increases the voltage of the first battery during the power supply from the first battery that supplies operating power to the same power supply target to the power supply target. When the voltage falls below the threshold value, both switches of the first battery and the switch of the second battery are turned on for a predetermined time, and then the first battery is turned on.
Turn off the battery. Further, the first battery is the first battery.
And when the voltage of the second battery falls below a second threshold below the first threshold, the switch for the first battery and the second battery Since both switches are turned on for a predetermined time and then the switch of the second battery is turned off, it is possible to prevent a power failure of the system due to exhaustion of both batteries.

(Embodiment) FIG. 1 shows a schematic configuration of a battery type power supply device according to an embodiment of the present invention. In the figure, reference numeral 1 denotes a system such as a computer or a word processor, which is a power supply target of the present power supply device. Two systems of batteries B1 and B2 capable of operating this system are incorporated in the device, and the battery B1 is connected to the power supply line of the system 1 via the switching element S1, and the battery B2 is connected to the power supply line of the system 1 via the switching element S2. . The control circuit 2 includes the above-described switching means and monitoring means, monitors the voltages of the batteries B1 and B2, and controls the switching elements S1 and S2.

FIG. 2 shows a control procedure by the control circuit 2.

In the initial processing, both the switching elements S1 and S2 are turned on, the batteries B1 and B2 are operated in parallel, and the voltages of the batteries B1 and B2 are checked (steps 100, 101, 102). In this embodiment, the threshold value as a criterion for determining a voltage drop is set high for the battery B1 and low for the battery B2, and the battery B1 is used with priority as described below.

If the voltages of the batteries B1 and B2 are both normal, the switching element S2 is turned off, and power is supplied from the battery B1 to the system 1 (repeated from 101 to 102 to 103 to 105). When the voltage of the battery B1 becomes lower than the reference (the threshold value for this determination is relatively high, the battery B1 can be used for a considerable time thereafter), a consumption notification signal of the battery B1 is output (106), and the battery B2 is discharged. Check the voltage (107).

If the voltage of battery B2 is normal, first switch
Both S1 and S2 are turned on for a predetermined time, and then the switching element S1 is turned off (108 → 109 → 110). This is battery B1
The battery has been switched to the battery B2 without any trace (no instantaneous interruption). In this state, the battery B1 can be replaced with a new one.

When the voltage of not only the battery B1 but also the battery B2 becomes lower than the reference (the threshold of the battery B2 is low, the battery B2 is more depleted), the switching elements S1 and S2 are both turned on for a predetermined time. After that, the switching element S2 is turned off, and power is supplied from the battery B1 which consumes little power (107 → 111 → 112).
In addition, a power failure warning signal is issued to the system 1 (113), and a battery B2 exhaustion notification signal is issued. In this state, first replace the battery B2 (then B2 is used),
Next, the battery B1 is replaced (then B1 is used). Therefore, the instantaneous interruption does not occur at all, and the system 1 can be continuously operated.

[Effects of the Invention] As described in detail below, when the voltage of the first battery falls below the first threshold while the first battery supplies power to the power supply target, the first battery is switched. And the second battery switch are turned on for a predetermined period of time, and then the first battery switch is turned off, so that the voltage of the second battery falls below a second threshold value lower than the first threshold value. When this happens, both the switch of the first battery and the switch of the second battery are turned on for a predetermined time and then the switch of the second battery is turned off.
Even if the second battery is consumed following the first battery, it is possible to switch to the first battery, which is less consumed than the second battery, operate the system, and secure time to replace the battery. It is possible to prevent a power failure of the system due to consumption of both batteries.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a battery type power supply device according to an embodiment of the present invention, and FIG. 2 is a flowchart of a control operation executed by a control circuit in the device. 1: System (power supply target) 2: Control circuit B1, B2: Battery S1, S2: Switching element

Claims (1)

(57) [Scope of request for utility model registration] A first power supply for supplying operating power to the same power supply target
And a second battery; a first switch connecting the first battery and the power supply target; a second switch connecting the second battery and the power supply target; When the voltage of the first battery becomes equal to or lower than the first threshold while power is being supplied to the power supply target, both switches of the first battery and the second battery are turned on for a predetermined time. Means for turning off the switch of the first battery after the first battery; and after the voltage of the first battery has fallen below the first threshold, the voltage of the second battery remains below the first threshold. Means for turning on the switches of the first battery and the switch of the second battery for a predetermined time and then turning off the switch of the second battery when the voltage falls below the low second threshold value; A battery-powered power supply comprising: