JPH0686472A - Battery voltage converter - Google Patents

Abstract

PURPOSE:To provide a battery voltage converter improved so that an electrical quantity of a battery can be effectively used concerning the battery voltage converter in which a voltage of the battery is converted and the voltage is supplied to a load. CONSTITUTION:A DC voltage converter in which a voltage of a battery is converted and the voltage is supplied to a load comprises DC voltage conversion means A(1) for converting the voltage of a battery A, DC voltage conversion means 13(2) for converting the voltage of a battery B, operating switching means (3) for alternately switching operations of the DC voltage conversion means A(1) and B(2), and switching command generating means (4) for generating a switching command to the operating switching means (3).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a battery voltage converter for converting a battery voltage and supplying it to a load.

[0002]

BACKGROUND OF THE INVENTION Many portable electronic devices are in use today. A battery is used as a power supply for operating these electronic devices.After switching the DC voltage from the battery to convert it to AC, in addition to a step-up or step-down transformer, the output of the transformer is rectified and specified. DC voltage is obtained and supplied to electronic circuits.

[0003]

The operating time of an electronic device may be long depending on the time, and the battery voltage gradually decreases when it is operated for a long time. It begins to descend and becomes unusable.

Generally, it is known that a battery, especially a manganese battery or an alkaline battery, discharges a larger amount of electricity when it is used in a divided manner than when it is continuously used for a long time. An object of the present invention is to provide a battery voltage conversion device improved so that the capacity of the battery can be effectively used.

[0005]

Means adopted by the present invention to solve the above problems will be described with reference to FIG.
FIG. 1 shows the principle of the present invention. A DC voltage converter for converting the voltage of a battery and supplying it to a load, comprising: (a) a battery A
DC voltage converting means A (1) for converting the voltage of
DC voltage conversion means B (2) for converting the voltage of the battery B,
(C) an operation switching means (3) for alternately switching the operations of the DC voltage converting means A (1) and B (2); and (d) a switching command generation for generating a switching command to the operation switching means (3). Means (4);

[0006]

The DC voltage converting means 1 converts the voltage of the battery A and supplies it to the load. The DC voltage converting means B2 is a battery B
Voltage is converted and supplied to the load. The operation switching means 3 is
The operations of the DC voltage converting means A1 and B2 are alternately switched by a switching command from the switching command generating means 4.

As described above, the operation of the DC voltage generating means for converting the voltage from the batteries A and B and supplying it to the load is alternately switched, so that either one of the batteries A and B is inactive. In this state, the terminal voltage of the battery is restored during this period, the amount of electricity of the battery can be effectively used, and the electronic device as the load can be continuously used for a longer time.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described with reference to FIGS. 2 is a configuration diagram of the first embodiment, and FIG. 3 is an operation time chart of the same embodiment. In FIG. 2, 1
Reference numeral 1 is a DC voltage converter A, and 12 is a DC voltage converter B, which converts a DC current from the batteries A71 and B72 into an AC by a switching circuit (not shown), converts a voltage through a transformer, and converts the voltage. The AC voltage is rectified and supplied to the load 6.

The operation switching means 3 for alternately switching the operations of the DC voltage converters A11 and B12 is composed of AND circuits 31 and 32, and the AND circuits 31 and 32 form a flip-flop. The switching command generating means 4 for generating a switching command to the operation switching means 3 is an operational amplifier 4
1 and 42, power supply 43, resistors R _{1 to} R ₄ (44 to ₄
7).

The voltage of the power supply 43 gives a reference voltage for generating a switching command, and when a battery is used, the terminal voltage drops, and a switching command is generated when the voltage drops below the reference voltage. To do. Therefore, the reference voltage is lower than the battery voltage when there is no load, and is set to a value equal to or higher than the voltage at which the voltage cannot be recovered even when the use of the battery is stopped.

Next, the operation will be described with reference to the time chart of FIG. 3A and 3B are voltages input to operational amplifiers 41 and 42, (c) and (d) are output voltages, and (e) and (f) are AND circuits 3.
2 and 31 outputs are shown.

At time T ₀ , the operation is started, the output of the AND circuit 32 becomes “1”, the output of the AND circuit 31 becomes “0”, the DC voltage converter A11 starts its operation, and the DC power is supplied to the load. To do. When the DC voltage converter A11 starts its operation, as shown in FIG.
Voltage decreases with time, becomes the same as the voltage of the power supply 43 at time T ₁ , the output of the operational amplifier 41 becomes 0 as shown in FIG. 3C, and becomes positive at time t = T ₁ + Δt.

When the output of the operational amplifier 41 becomes positive, the flip-flop formed by the AND circuits 31 and 32 is inverted, and the output of the AND circuit 32 becomes "as shown in FIGS. 3 (e) and 3 (f). 0 ", the output of the AND circuit 31 becomes" 1 ", the operation of the DC voltage converter A11 is stopped, and the DC voltage converter B12 is operated.

Then, at time t = T ₂ + Δt,
The output of the operational amplifier 42 becomes positive, the flip-flop is inverted, the DC voltage converter A11 starts operating again, the DC voltage converter B12 stops operating, and the battery voltage is restored. Next, a second embodiment will be described with reference to FIGS.

In FIG. 4, the DC voltage converter A11, the DC voltage converter B12, the operation switching means 3, the battery A71, the battery B72 and the load 6 are as described in FIG.
In the second embodiment, the switching command generating means 4 includes a timer circuit 52.
And an inverter 53.

The timer circuit 52 generates a switching command signal at regular time intervals. That is, if the load 6 is constant and the power is continuously supplied from the battery 71 or 72,
The time T ₁ until the terminal voltage of the battery drops to the reference voltage described in the first embodiment can be obtained in advance. Therefore, in the timer circuit 52, this T
_The switching signal is generated in less than ₁ hour.

The operation time chart shown in FIG. 5 shows the case where the switching signal is generated from the timer circuit 52 every time T ₁ (FIG. 5 (a)). When the operation is started at time t = T ₀ , the signal "1" is sent from the timer circuit 52, the output of the AND circuit 32 becomes "1", and the output of the AND circuit 31 becomes "0", the DC voltage converter A11 starts to operate, and the load 6 starts supplying power from the battery A71.

The operation of the DC voltage converter A11 is started,
When power is supplied from the battery A71, the terminals of the battery A71
The voltage drops over time. However, the movement of battery A71
When the terminal voltage does not recover even if the operation is stopped
Before time, that is, time t = T ₁Output of timer circuit 52
Becomes “0”, and the AND circuit 3 via the inverter 53.
Enter “1” in 1.

When "1" is input to the AND circuit 31, the flip-flop is inverted, the output of the AND circuit 31 becomes "1", the output of the AND circuit 32 becomes "0", and the operation of the DC voltage converter A11 is performed. Stop the DC voltage converter B1
The operation of No. 2 is started, and electric power is supplied from the battery B72 to the load 6.

Then, the time t = T ₂ after the elapse of a certain time.
The signal "1" is again sent from the timer circuit 52 to
The flip-flop is inverted and the operation of the DC voltage converter A11 is started. Next, a third embodiment will be described with reference to FIGS.

In FIG. 6, except for the switching command generating means 4, it is the same as that described in FIG. The third switching command generating means 4 in the embodiment of operational amplifier 41 and 42 and resistors R ₁ ~
It is composed of R ₈ (44 to 51). The operational amplifiers 41 and 42 include resistors R ₃ and R ₄ and R ₇ and R ₈ , R ₁
And the divided voltage of the R ₂ and R ₅ and R ₆ by a battery A71 and cell B72, and outputs a voltage difference operates as a comparator.

The operation is started at time t = T ₀ , the AND circuit 32 outputs "1", the AND circuit 31 outputs "0", the DC voltage converter A11 starts the operation, and the load 6 receives the battery A7.
Power is supplied from 1. When the DC voltage converter A11 operates and the supply of electric power from the battery A11 is started, the terminal voltage of the battery A11 decreases with time, and at time t = T ₁ , the terminal voltage difference between the battery A71 and the battery B72 becomes constant. Above a certain value.

When the terminal voltage difference exceeds a certain value at time t = T ₁ , the output of the operational amplifier 41 becomes positive, the flip-flop is inverted, the output of the AND circuit 31 is "1", and the output of the AND circuit 32. Becomes "0", the DC voltage converter B12 starts operating, and the DC voltage converter A11
Stop the operation of.

When the operation of the DC voltage converter A11 is stopped, the battery A71 becomes unloaded and its terminal voltage recovers with time. On the other hand, the terminal voltage of the battery B72 decreases with time. At time t = T ₂ , when the voltage difference between both batteries becomes a certain value or more, the output of the operational amplifier 42 becomes positive, the flip-flop is inverted, the output of the AND circuit 32 is “1”, the output of the AND circuit 31. Becomes "0", the operation of the DC voltage converter A11 is restarted, and the operation of the DC voltage converter B12 is stopped.

In the embodiment described above, the DC voltage converters A and B are switched, but the operation of the switching unit for converting DC to AC in the DC voltage converter is switched to convert AC voltage. It is also possible to share a transformer that operates and an AC / DC converter that rectifies and filters the transformed AC voltage, and thus the circuit configuration can be simplified.

Although one embodiment of the present invention has been described above, the present invention is not limited to these embodiments and various modifications can be made according to the gist of the invention.

[0027]

As described above, according to the present invention, the following effects can be obtained. Since the operation of the DC voltage generating means for converting the voltage from the batteries A and B to be supplied to the load is alternately switched to operate, either one of the batteries A and B is in the rest state, and the terminals of the batteries are in the meantime. The voltage is restored, the amount of electricity of the battery can be effectively used, and the electronic device as a load can be continuously used for a longer time.

[Brief description of drawings]

FIG. 1 is a principle diagram of the present invention.

FIG. 2 is a configuration diagram of a first embodiment of the present invention.

FIG. 3 is an operation time chart of the first embodiment.

FIG. 4 is a configuration diagram of a second embodiment of the present invention.

FIG. 5 is an operation time chart of the second embodiment.

FIG. 6 is a configuration diagram of a third embodiment of the present invention.

FIG. 7 is an operation time chart of the third embodiment.

[Description of Reference Signs] 1 DC voltage converting means A 2 DC voltage converting means B 3 Operation switching means 4 Switching command generating means 6 Load 11, 12 DC voltage converter 31, 32 AND circuit 41, 42 Operational amplifier 43 Power supply 44-51 Resistance 52 timer circuit 53 inverter 71, 72 battery

Claims (4)

[Claims] 1. A DC voltage converter for converting the voltage of a battery and supplying it to a load, comprising: (a) a DC voltage converting means A for converting the voltage of the battery A.
(1) and (b) DC voltage conversion means B for converting the voltage of the battery B
(2), (c) an operation switching means (3) for alternately switching the operations of the DC voltage converting means A (1) and B (2), and (d) a switching command to the operation switching means (3). A battery voltage conversion device comprising: a switching command generating means (4) for generating. 2. The switching command generation means (4) generates a switching command when the voltages of the batteries A and B become equal to or lower than a set value. The battery voltage converter described. 3. The battery voltage converter according to claim 1, wherein a switching command of said switching command generating means (4) is generated by a timer at fixed time intervals. 4. A switching command of the switching command generating means (4) is generated when the voltage difference between the batteries A and B exceeds a set value. Battery voltage converter.