JPH04248329A - Electronic appliance - Google Patents

Abstract

PURPOSE:To operate an electric appliance with high efficiency by detecting the terminal voltage of a battery and switching the battery based on thus detected terminal voltage. CONSTITUTION:When the terminal voltage V1 of a dry cell 2 exceeds the terminal voltage V2 of a dry cell 4 by more than a predetermined extent, a switching control circuit 28 turns a transistor 6 ON while turns a transistor 16 OFF thus feeding power from the dry cell 2 through a smoothing capacitor 30 to camcorder body. When the dry cell 2 is used continuously under that state, terminal voltage V1 of the dry cell 2 drops. When the terminal voltage V2 of the dry cell 4 exceeds the terminal voltage V1 of the dry cell 2 by more than a predetermined extent, the transistor 16 is turned ON followed by turn OFF of the transistor 8 thus feeding power from the dry cell 4 to the camcorder body.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to electronic equipment, and can be applied to, for example, a camera-integrated video tape recorder.

0002

2. Description of the Related Art Hitherto, some electronic devices such as camera-integrated video tape recorders have been designed to be able to be used with batteries or dry cells. As shown in FIG. 4, when such a battery or dry cell is used for a long time with a load connected, the terminal voltage drops rapidly just before it is completely discharged.

[0003] Therefore, in this type of electronic equipment, by setting the operating voltage so that it cannot operate immediately before the terminal voltage suddenly drops, the electric power of the battery or dry battery can be used to the maximum, and the battery can be , which allows efficient use of dry batteries.

0004

[Problem to be Solved by the Invention] By the way, in batteries and dry batteries, even if the terminal voltage drops and electronic equipment cannot operate, there remains power, and this remaining power is used to power electronic equipment. If you can make it work, you can use it even more efficiently.

The present invention has been made in consideration of the above points, and it is an object of the present invention to propose an electronic device that can use batteries and dry cells more efficiently than in the past.

[0006]

[Means for Solving the Problems] In order to solve the problems, in the present invention, first and second batteries 2 and 4,
A comparison circuit 26 that compares the voltages V1 and V2 of the first and second batteries 2 and 4 and outputs a comparison result SC, and selects the first or second battery 2 or 4 based on the comparison result SC,
a power output circuit 6 that outputs driving power to the electronic device body;
8, 10, 12, 16, 18, 20, 22, 28, 30
and be prepared.

[0007]

[Operation] Voltages V1 and V of the first and second batteries 2 and 4
2, and based on the comparison result SC, select the first or second
If the battery 2 or 4 is selected and the driving power is output to the main body of the electronic device, even if the remaining capacity of the first and second batteries 2 and 4 is low and their terminal voltages V1 and V2 drop, It can be used after waiting for the return of the terminal voltages V1 and V2, and the first and second batteries 2 and 4 can be used more effectively.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings.

(1) First Embodiment In FIG. 1, 1 generally indicates the power supply circuit of a camera-integrated video tape recorder, and dry batteries 2 and 4 are used alternately. That is, in the power supply circuit 1, the dry battery 2 has its negative terminal grounded and its positive terminal connected to the transistor 6.

The transistor 6 has its base and emitter connected by a resistor 8, and also has a resistor 10 and a transistor 12.
The base is grounded through the transistor 12, thereby switching the operation of the transistor 12 so that the power from the dry battery 2 can be output to the main body of the camera-integrated video tape recorder (not shown).

Similarly, the dry battery 4 has its negative terminal connected to ground, and its positive terminal connected to the transistor 16. transistor 16
The base and emitter are connected by a resistor 18, and the base is grounded via a resistor 20 and a transistor 22. This switches the operation of the transistor 22, and connects the power source of the dry battery 4 to the main body of the camera-integrated video tape recorder. It is designed so that it can be output to. The voltage detection circuit 26 detects terminal voltages V1 and V2 of the dry batteries 2 and 4.
is detected, and when the terminal voltage V1 of the dry battery 2 becomes larger than the terminal voltage V2 of the dry battery 4 by a predetermined value or more, the signal level of the comparison output signal SC is raised. When the terminal voltage V1 of the dry battery 2 becomes larger than a predetermined value or more, the signal level of the comparison output signal SC is lowered.

As shown in FIG. 2, the switching control circuit 28 outputs control signals S1 and S1 to the transistors 12 and 22 in response to the signal level of the comparison output signal SC (FIG. 2A).
S2 (FIGS. 2B and 2C) is output, thereby driving the main body of the camera-integrated video tape recorder by alternately using the dry batteries 2 and 4.

That is, when the terminal voltage V1 of the dry battery 2 becomes larger than the terminal voltage V2 of the dry battery 4 by a predetermined value or more, the switching control circuit 28 switches the transistor 6 to the on state and then switches the transistor 16 to the off state, thereby Power from the dry battery 2 is outputted to the main body of the camera-integrated video tape recorder via the smoothing capacitor 30. If the dry battery 2 is continued to be used in this state, the terminal voltage V1 of the dry battery 2 will drop. Therefore, when the terminal voltage V2 of the dry battery 4 becomes higher than the terminal voltage V1 of the dry battery 2 by a predetermined value or more, the transistor 16 is turned on, and then the transistor 8 is turned off, and the power source of the dry battery 4 is turned off. Output to the main body of the camera-integrated video tape recorder.

[0014] In other words, even if a dry battery is used until it is almost fully discharged and the terminal voltage becomes low,
It has the characteristic that the terminal voltage recovers if the device is stopped and left unused, and when the terminal voltage recovers in this way, it can be used in the original electronic device for a short period of time. Therefore, if dry batteries 2 and 4 are used alternately based on the comparison results of terminal voltages V1 and V2 (Fig. 2 (D) and (E)) in this way, the remaining capacity of dry batteries 2 and 4 will decrease. Even in this case, the dry batteries 2 and 4 can be used, and the dry batteries 2 and 4 can be used effectively accordingly.

In practice, if the dry batteries 2 and 4 are switched and used in this way, the battery life will be reduced by about 10 to 20% compared to the conventional method.
] A considerably larger amount of power can be extracted from the dry batteries 2 and 4, and the dry batteries 2 and 4 can be used more effectively. Furthermore, if you switch and use dry batteries 2 and 4 in this way,
It is also possible to use the dry battery 2 or 4 in a state where the internal resistance is small.

Furthermore, in this embodiment, the switching control circuit 28 simultaneously supplies power from the two dry batteries 2 and 4 to the main body of the camera-integrated videotape recorder for a minute period T when switching between the dry batteries 2 and 4. This is designed to prevent instantaneous power outages.

In the above configuration, when power is supplied from the dry cell battery 2 to the main body of the camera-integrated videotape recorder, the power supply circuit 1 interrupts the supply of power from the dry cell battery 4, thereby restoring the terminal voltage V2 of the dry cell battery 4. wait. In this state, the terminal voltage V2 of the dry battery 4 is restored and the dry battery 2
When the terminal voltage V1 of the dry battery 2 drops and the terminal voltage V1 of the dry battery 2 becomes larger than the terminal voltage V2 of the dry battery 4 by a predetermined value or more, the transistor 16 is switched to the on state, and then the transistor 6 is switched to the off state.

As a result, the power from the dry battery 4 is supplied to the main body of the camera-integrated video tape recorder, and the supply of power from the dry battery 2 is interrupted. In this state, dry battery 2
When the terminal voltage V1 of the dry battery 4 is restored, the terminal voltage V1 of the dry battery 4 is restored.
2 drops and the terminal voltage V2 of the dry battery 4 becomes greater than the terminal voltage V1 of the dry battery 2 by a predetermined value or more, the transistor 6
After switching to the on state, transistor 16 switches to the off state.

As a result, the power from the dry battery 2 is supplied to the main body of the camera-integrated video tape recorder, and the supply of power from the dry battery 4 is interrupted. By repeating this switching operation, the dry batteries 2 and 4 can be used more efficiently than in the past.

According to the above configuration, by alternately switching and using the dry batteries 2 and 4, even when the remaining capacity of the dry batteries 2 and 4 becomes low, the dry batteries 2 and 4 can be used, which makes it possible to In comparison, the dry batteries 2 and 4 can be used more efficiently.

(2) Other Embodiments Although the above-mentioned embodiment describes the case in which power is supplied directly from the dry battery to the main body of the camera-integrated video tape recorder, the present invention is not limited to this. It may also be used in combination with a regulator circuit.

That is, as shown in FIG.
, the control circuit 42 controls the terminal voltage V of the dry batteries 2 and 4.
1 and V2, and drive transistors 44 and 46 based on the detection results. As a result, the power supply circuit 40
is connected to the dry batteries 2 and 4 via the transistor 44 or 46.
The power is output to the filter 48, and the diode
After rectifying with 0 or 52, it is output via a smoothing capacitor 30.

Even if the dry batteries 2 and 4 are used alternately in combination with the switching regulator circuit in this way, the dry batteries 2 and 4 can be used more efficiently than in the past.

Furthermore, in the above-mentioned embodiment, a case was described in which two dry batteries are used by switching, but the present invention is not limited to this, and even if two or more dry batteries are used by switching. good.

[0025] Furthermore, in the above-mentioned embodiment, a case was described in which dry batteries were used, but the present invention is not limited to this.
It can also be widely applied when using batteries.

Furthermore, in the above-described embodiments, the case where the present invention is applied to a camera-integrated video tape recorder has been described, but the present invention is not limited to this, but can be widely applied to electronic equipment that uses dry cells or batteries. Can be done.

[0027]

Effects of the Invention As described above, according to the present invention, the terminal voltage of the battery is detected and the battery is switched and used based on the detection result, so that the battery can be used even when the remaining capacity of the battery is low. It can be used after waiting for the terminal voltage to return.
Accordingly, it is possible to obtain an electronic device that can use batteries more efficiently than in the past.

[Brief explanation of the drawing]

FIG. 1 is a connection diagram showing a power supply circuit according to an embodiment of the present invention.

FIG. 2 is a signal waveform diagram for explaining the operation.

FIG. 3 is a connection diagram showing another embodiment.

FIG. 4 is a characteristic curve diagram showing changes in terminal voltage of a dry battery.

[Explanation of symbols]

1, 40...charging device, 2, 4...dry battery, 26...voltage detection circuit, 28...switching control circuit.

Claims (1)

[Claims] Claim 1: First and second batteries, and the first and second batteries.
a comparison circuit that compares the voltages of the batteries and outputs a comparison result; and a power output circuit that selects the first or second battery based on the comparison result and outputs driving power to the electronic device main body. An electronic device characterized by: