JPH0629011A - Battery type power supply device - Google Patents

Abstract

PURPOSE:To make sensing and display only in a specified period associated with a switch. CONSTITUTION:One end of a battery 1 is connected to one 2a of the terminals to be connected to a load (apparatus) 100, while the other end is connected to the other terminal 2b through a sensing resistor 3. One end of the battery 1 is connected to a regulator circuit 4 and a voltage-variable amplifier 5. The two ends of the sensing resistor 3 are connected to a differential amplifier 6, and the output therefrom is connected to the control terminal of the amplifier 5. The output of amplifier 5 is connected through a switch 7 to a voltage divider circuit of resistors 8a(b,c), 9a(b,c), and the voltage divider output and the output of the regulator circuit 4 are connected to a comparator 10a(b,c). The output therefrom is connected to a light emitting diode 11a(b,c). Also the output of the amplifier 5 is directly connected to a voltage divider circuit of resistors 12, 13, and the voltage divider output and the output of the regulator circuit 4 are connected to another comparator 14. The output therefrom is connected to light emitting diode 11c.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a battery type power supply device using, for example, a rechargeable secondary battery which is used as a power source for equipment such as a VTR integrated video camera.

[0002]

2. Description of the Related Art In a battery-type power supply device used as a power supply for a device such as a VTR integrated video camera, the remaining capacity of a built-in, for example, rechargeable secondary battery is displayed.

In that case, conventionally, two display methods have been performed, in which the state is always displayed according to the remaining capacity, and the state is always displayed only when a load (device) is connected. In this method, the display (warning) is displayed on the viewfinder of the device only when the remaining capacity becomes less than the specified value.

However, this method consumes a large amount of battery for detecting and displaying the remaining capacity, and is not suitable for use as a power supply device. In the other method, even if the remaining capacity is reduced due to natural discharge or the like, it may not be known until it is connected to the device and driven, and the device may not be driven when necessary. This application is made in view of such a point.

[0005]

The problem to be solved is that if the display is always attempted, the battery will be consumed so much that the display only when connected to the device may not drive the device when necessary. Is.

[0006]

The first means of the present invention is to provide a battery 1 and means for detecting the remaining capacity of the battery (a voltage dividing circuit of resistors 8a and 9a, 8b and 9b, 8c and 9c, Comparators 10a, 10b, 10c) and means (light emitting diodes 11a, 11) for displaying the detected remaining capacity.
b, 11c) and a switch 7 is provided in the detection means and the display means, and the detection and the display are performed only while the switch is pressed. It is a power supply device.

A second means according to the present invention is a battery 1 and means for detecting the remaining capacity of the battery (resistors 8a, 9a, 8).
b and 9b, 8c and 9c voltage divider circuit, comparator 10
a, 10b, 10c) and means for displaying the detected remaining capacity (light emitting diodes 11a, 11b, 11c) are incorporated, and a switch 7 is provided in the detection means and the display means.
Is provided so that the detection and display are performed only for a predetermined period after the switch is pressed.

The third means according to the present invention is the above-mentioned when the remaining capacity of the battery 1 detected by the detecting means (the voltage dividing circuit of the resistors 12 and 13 and the comparator 14) becomes equal to or less than a specified value. The battery-type power supply device according to the first means or the second means, wherein a warning is displayed (light emitting diode 11c) regardless of the switch 7.

The fourth means according to the present invention detects the value of the current flowing from the battery 1 to the load 100 (detection resistor 3, differential amplifier 6) and detects the remaining capacity of the battery according to this current value. The battery-type power supply device according to the first means, the second means, or the third means, which is configured to correct the value at the time of (voltage variable amplifier 5).

[0010]

According to this, the detection and the display are performed only for a predetermined period related to the switch, and when the remaining capacity becomes less than the specified value, the warning is displayed regardless of the switch, and the battery consumption is reduced. Thus, it is possible to detect and display a good remaining capacity.

[0011]

1 is a block diagram showing an example of a circuit of a battery type power supply device according to the present invention. In this figure, 1 is a rechargeable secondary battery, for example. One end of the battery 1 is connected to one terminal 2a of predetermined terminals connected to the load (device) 100. The other end of the battery 1 is grounded, and the other end of the battery 1 is connected to the other terminal 2b of the above-mentioned predetermined terminals through a detection resistor 3 described later.

Further, one end of the battery 1 is connected to the regulator circuit 4 for generating a reference voltage, and one end of the battery 1 is connected to the voltage variable amplifier 5. Further, both ends of the above-mentioned detection resistor 3 are connected to a differential amplifier 6, and this differential amplifier 6
Is connected to the control terminal of the voltage variable amplifier 5.

Further, the output of the voltage variable amplifier 5 is connected to resistors 8a and 9a through a push type switch 7,
It is connected to the voltage dividing circuits 8b and 9b, 8c and 9c. Here, the resistors 9a, 9b, and 9c have the same resistance value, and the resistors 8a, 8b, and 8c have different resistance values so that the necessary voltage division ratios can be obtained.

The divided outputs are connected to one input of the comparators 10a, 10b and 10c, respectively. The output of the regulator circuit 4 is the comparator 10
It is connected to the other input of a, 10b, and 10c. The outputs of the comparators 10a, 10b and 10c are connected to the light emitting diodes 11a, 11b and 11c, respectively.

The output of the voltage variable amplifier 5 is directly connected to the voltage dividing circuit of the resistors 12 and 13. Each of the divided outputs is connected to one input of the comparator 14. The output of the regulator circuit 4 described above is connected to the other input of the comparator 14. The output of the comparator 14 is connected to the oscillator 16 through the diode 15, and the output of the oscillator 16 is connected to the light emitting diode 11c.

Therefore, in this device, when the switch 7 is turned on, the resistors 8a and 9a, 8b and 9b, 8c and 9 are connected.
The voltage of the battery 1 divided by the voltage dividing circuit of c is supplied to the comparators 10a, 10b, 10c, and these voltages are compared with the reference voltage from the regulator circuit 4. The voltage of the battery 1 is, for example, 20% of the remaining capacity, 4
The comparative output is taken out when the voltage reaches 0% and 80%.

As a result, the remaining capacity of the battery 1 is, for example, 80.
%, 40%, 20% when light emitting diode 11
The states of the respective remaining capacities when a, 11b, and 11c are turned on and the switch 7 is turned on are displayed.

In this device, detection (comparison) and display are performed only when the switch 7 is turned on, and no voltage is supplied to the comparator or the light emitting diode when the switch 7 is turned off, so that battery consumption is greatly reduced. Can be reduced.

On the other hand, the voltage dividing circuit of the resistors 12 and 13 and the comparator 14 detect a state in which the remaining capacity of the battery 1 is below a specified value such that the device cannot be driven.
When this state is detected, the light emitting diode 11c is turned on regardless of the switch 7 (flashing by the oscillator 16).
The state below the specified value that cannot drive the device is clearly displayed.

Further, FIG. 2 shows the external appearance of the battery type power supply device according to the present invention. In the figure, reference numeral 21 denotes a battery-type power supply device as a whole, and a push switch 7 and light emitting diodes 11a, 11b, 11c are provided on the front surface of the device 21.

By pushing the push switch 7 to turn it on, the light emitting diodes 11a, 11a
The states of the respective remaining capacities are displayed at b and 11c.
When the remaining capacity becomes equal to or less than the specified value, the light emitting diode 11c is turned on (flashing by the oscillator 16) regardless of the switch 7.

Thus, according to the above device, the detection and the display are performed only for the predetermined period related to the switch, and
When the remaining capacity becomes less than or equal to the specified value, a warning is displayed regardless of the switch, and it is possible to reduce the consumption of the battery and perform good detection and display of the remaining capacity.

In the above-mentioned device, the switch 7 may be provided with a time constant so that the above-mentioned detection and display are performed during a predetermined period after the switch is pressed.

In the above-mentioned device, the output voltage of the battery 1 decreases as the load current increases. Therefore, the current value of the load is detected by the detection resistor 3 and the differential amplifier 6, and this current value is supplied to the control terminal of the voltage variable amplifier 5 to correct the value when the remaining capacity of the battery 1 is detected. This corrects the fluctuation of the detected voltage due to the magnitude of the load current. The value of the detection resistor 3 is sufficiently smaller than the internal impedance of the battery 1.

The device described above is not limited to the case of using a rechargeable secondary battery, but a plurality of general-purpose batteries (dry batteries) are collectively housed in a case, and terminals are provided at predetermined positions of the case for exclusive use. It can also be applied to the case of using in place of the rechargeable power supply device.

[0026]

According to the present invention, the detection and the display are performed only for a predetermined period related to the switch, and when the remaining capacity becomes less than the specified value, the warning is displayed regardless of the switch, and the battery It has become possible to detect and display a good remaining capacity with less consumption.

[Brief description of drawings]

FIG. 1 is a circuit block diagram of an example of a battery type power supply device according to the present invention.

FIG. 2 is an external view of an example of the battery type power supply device according to the present invention.

[Explanation of symbols]

 1 Battery 100 Load (equipment) 2a, 2b Terminal 3 Detection resistor 4 Regulator circuit 5 Voltage variable amplifier 6 Differential amplifier 7 Switch 8a, 9a, 8b, 9b, 8c, 9c Resistor 10a, 10b, 10c Comparator 11a, 11b, 11c Light emitting diode 12, 13 Resistor 14 Comparator 15 Diode 16 Oscillator

Claims (4)

[Claims] 1. A battery, a means for detecting the remaining capacity of the battery, and a means for displaying the detected remaining capacity are built-in, and a switch is provided in the detection means and the display means,
A battery-type power supply device characterized in that the detection and display are performed only while the switch is being pressed. 2. A battery, a means for detecting the remaining capacity of the battery, and a means for displaying the detected remaining capacity are built-in, and a switch is provided in the detection means and the display means,
A battery type power supply device characterized in that the detection and the display are performed only for a predetermined period after the switch is pressed. 3. The warning display according to claim 1 or 2, wherein when the remaining capacity of the battery detected by the detecting means falls below a specified value, a warning is displayed regardless of the switch. Battery powered power supply. 4. The method according to claim 1, wherein the value of the current flowing from the battery to the load is detected, and the value used when detecting the remaining capacity of the battery is corrected according to the current value. Item 3. A battery-type power supply device according to item 3.