JP2003079132A - Electronic device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To achieve an electronic device, in which the change with passage of time of an aluminum electrolytic capacitor increases the ripple amount of electric power supplied to each circuit that constitutes the electronic device and causes the decrease in its function, that displays 'REPLASE CAPACITOR' on a display device prior to the occurrence of the decrease in function, so that the appropriate timing of the replacement of the electrolytic capacitor can be checked visually. SOLUTION: This electronic device comprises a means for always determining if the ripple amount of the power generated in a power supply circuit is an appropriate value. Even if the ripple amount of the power is caused to increase due to the change with passage of time of the electrolytic capacitor, a ripple detection circuit outputs a detection signal and superimposes the information of 'REPLACE CAPACITOR' on a transmission signal.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power supply circuit, and more particularly to detecting deterioration of an aluminum electrolytic capacitor used for power supply rectification.

[0002]

2. Description of the Related Art Generally, an aluminum electrolytic capacitor is used in a power supply circuit incorporated in or externally attached to an electronic device such as a television camera for the purpose of power rectification. Aluminum electrolytic capacitors are parts that have a shorter life than other parts. The capacity of the aluminum electrolytic capacitor used in such a power supply circuit decreases with time. As a result, the power supply rectification function of the power supply circuit deteriorates, and the ripple superimposed voltage or current is
For example, when it is supplied to each circuit block constituting the TV camera, the ripple amount of the supplied power increases, and thus the function of the electronic device deteriorates, for example, the image quality deteriorates in the case of the TV camera. become. In order to prevent such functional deterioration, the aluminum electrolytic capacitor is replaced before the capacity of the aluminum electrolytic capacitor is reduced or when it is considered necessary.

However, since the amount of decrease in the capacity of the aluminum electrolytic capacitor varies depending on the use conditions, it is difficult to predict how long the phenomenon of the functional deterioration will occur, and since the noise phenomenon is prevented in advance, there is no decrease in the capacity. I often replaced the aluminum electrolytic capacitor.

[0004]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
When the capacity of the aluminum electrolytic capacitor of the power supply circuit was reduced due to aging, the power supply rectification capability was reduced, the ripple-superposed power was supplied to the electronic device, and the function of the electronic device was degraded due to aging. In order to prevent such functional deterioration, the aluminum electrolytic capacitor was frequently replaced. However, since the amount of decrease in the capacity of the aluminum electrolytic capacitor differs depending on the usage conditions, it was difficult to predict how long the function would deteriorate. Therefore, when the aluminum electrolytic capacitor is periodically replaced, it is replaced even when the capacity of the aluminum electrolytic capacitor is small. An object of the present invention is to provide a technique capable of visually confirming an appropriate replacement time so as not to uselessly replace an aluminum electrolytic capacitor as described above.

[0005]

In order to achieve the above object, in the power supply circuit of the present invention, the ripple amount of the power supply generated in the electronic device is an appropriate value in the power supply circuit incorporating the aluminum electrolytic capacitor. Alternatively, it is characterized by having a means for always judging and notifying the judgment result.

That is, at least one electronic device of the present invention is provided.
Detection means having two power supply circuits, each detecting a ripple amount of a power supply generated by the power supply circuit, a means for judging whether or not the ripple amount detected by the detection means exceeds a predetermined value, and a judgment means. It is provided with a generating means for generating information based on the determination result of (1) and an output means for outputting the information generated by the generating means. Alternatively, the electronic device of the present invention has at least one power supply circuit, and the detection means for respectively detecting the ripple amount of the power supply generated by the power supply circuit and the ripple amount detected by the detection means exceed a predetermined value. It is provided with a means for determining whether or not it has occurred, a generating means for generating information when the ripple amount exceeds a predetermined value by the determining means, and an output means for outputting the information generated by the generating means. The output means of the electronic device of the present invention is a display means and displays information in characters. Alternatively, the output means of the electronic device of the present invention is
It is a voice output means and outputs information by voice.

Further, the electronic device of the present invention comprises a transmitting means for transmitting the information generated by the generating means, and the output means outputs the information transmitted by the transmitting means.
Furthermore, in the electronic device of the present invention, the transmission means is an internet line. Alternatively, in the electronic device of the present invention, in addition to the information, the device name, identification number, product name, installation location, installation date, product number, lot number, manufacturer name, power circuit identification number, product name, installation At least one of the place, the installation date, the product number, the lot number, the manufacturer name, and the replacement history of the aluminum electrolytic capacitor is added.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described with reference to FIG. FIG. 1 is a block diagram showing a schematic configuration of a television camera of the present invention. 1 is a lens, 2 is a solid-state image sensor, 3 is a pre-processing circuit, 4 is an analog-digital converter (hereinafter referred to as A / D converter), 5 is a digital signal processor (hereinafter referred to as DSP), 6 is A ripple detection circuit, 7 is a microcomputer (hereinafter referred to as a microcomputer), 8 is a character generation circuit, 9 is a power supply circuit, 10 is a synthesizer, and 11 is a television camera.

In FIG. 1, the light passing through the lens 1 is
An image is formed on the solid-state image sensor 2, converted into an electric signal, and output to the preprocessing circuit 3. The preprocessing circuit 3 subjects the output of the solid-state image sensor 2 to clamping, sampling, and automatic gain control, and outputs the result to the A / D converter 4. A / D
The converter 4 converts the output of the preprocessing circuit 3 from an analog signal to a digital signal and outputs it to the DSP 5. , DSP 5
Is subjected to process processing such as gamma and white balance on the output of the A / D converter 4, and encoded processing to a video signal, and is output as a video signal via the synthesizer 10.

The microcomputer 7 sends character data to the character generation circuit 8 when the result of the ripple detection circuit 6 exceeds a specified value. Reference numeral 9 denotes a power supply circuit, which supplies the voltage of the external power supply to each circuit of the TV camera (solid-state image sensor 2, preprocessing circuit 3,
A / D converter 4, DSP 5, ripple detection circuit 6, microcomputer 7, character generation circuit 8, synthesizer 10) is a circuit that converts the voltage required. The ripple detection circuit 6 detects the amount of ripple superimposed on the voltage supplied from the power supply circuit 9 constantly or at regular intervals. And
It is determined whether the ripple amount is within a preset specified value, and if it exceeds the specified value, a signal (detection signal) is output to the microcomputer 7. When the detection signal is given, the microcomputer 7 outputs the character data to the character generation circuit 8. The character generation circuit 8 generates a character from the input character data and outputs, for example, the character "condenser exchange" to the synthesizer 10, and the synthesizer 10 superimposes the character "condenser exchange" on the video signal. , Output as a video signal.

In the above embodiment, the ripple detection circuit is used.
6 detects the ripple amount of the power supply circuit 9 and determines whether the ripple amount is within a preset specified value. However, the ripple detection circuit 6 detects the ripple amount of the power supply circuit 9 and outputs the value of the detected ripple amount to the microcomputer 7, and the microcomputer 7 determines whether the ripple amount is within a preset specified value. You may decide. As described above, according to the above-described embodiment, even when the power ripple amount increases due to the aging of the aluminum electrolytic capacitor, the ripple detection circuit outputs the detection signal and superimposes the word "capacitor replacement" on the video signal. Therefore, it is possible to visually confirm that it is time to replace the aluminum electrolytic capacitor.

A second embodiment of the present invention will be described with reference to FIG. Figure 2 shows N (N is a positive integer) including the power supply circuit
3 is a block diagram showing a schematic configuration of the electronic device of FIG. The TV cameras 11-1, 11-2, ..., 11-N have a built-in power supply circuit (not shown) that uses an aluminum electrolytic capacitor, and in addition, as in Fig. 1, a ripple detection circuit, a microcomputer, and characters. It contains a generator circuit (not shown). The video signals from the TV cameras 11-1, 11-2, ..., 11-N and the characters that are superimposed on the video signals and indicate the state of the power supply circuit are converted into transmission data and the data bus 12
Is supplied to the monitor 13 via. Monitor 13
The input transmission data is converted into a video signal and, for example, at fixed time intervals, the TV cameras 11-1, 11-2 ,.
The video signal output from N and the character that is superimposed on the video signal and represents the state of the power supply circuit are displayed. Also, for example,
A warning sound is output from the speaker attached to the monitor 13 to warn the observer. At this time, multiple (N) TV cameras 11-1, 11-2, ..., 11-N or TV cameras 11-1, 11-2, ..., 11-N have a built-in power supply. In order to identify a circuit, for example, a device name, identification number, product name, installation location, installation date, product number, revision, lot number, manufacturer of an electronic device such as a television camera is added to the ripple amount information. Name, power circuit identification number,
Product name, installation location, installation date, product number, lot number,
At least one manufacturer's name and aluminum electrolytic capacitor exchange history identification number are superimposed, the information is converted into transmission data, the converted information is transmitted, and the transmitted information is displayed on the monitor 13.

A third embodiment of the present invention will be described with reference to FIG. Fig. 3 shows N power supply circuits (N is a positive integer)
FIG. 13 is a block diagram showing a schematic configuration in the case where the electronic device of FIG. The TV cameras 11'-1, 11'-2, ..., 11'-N have a built-in power supply circuit (not shown) that uses an aluminum electrolytic capacitor, and, in the same manner as in Fig. 1, a ripple detection circuit, It contains a microcomputer, a character generation circuit, and a network interface (not shown). The video signals from the TV cameras 11'-1, 11'-2, ..., 11'-N and the characters superposed on the video signals and representing the state of the power supply circuit are converted into transmission data and transmitted to the Internet. Line 1
For example, it is output to two monitors 13-1 and 13-2 via 4. At this time, multiple (N) TV cameras 1
To identify the power supply circuit built in 1'-1, 11'-2, ..., 11'-N, or the TV camera 11'-1, 11'-2, ..., 11'-N In addition, for example, IP address, TV camera identification number, power circuit number or type (product name, device name, revision, power circuit board name, manufacturer name, installation location, etc.) is a character that represents the state of the power circuit. It is superimposed with information, converted into transmission data, and finally displayed with the video signal on the monitor 13.

In the above embodiment, the electronic device having the power supply circuit built in or attached thereto has been described by taking the television camera as an example. However, it may be a power supply circuit used for an electronic device other than the television camera. FIG. 4 is a block diagram showing a schematic configuration of the electronic device of the present invention. Electronic device 11 ′
Is a power supply circuit 9 that is supplied with power from the outside and supplies the voltage required for each circuit (not shown).
Ripple detection circuit that detects the amount of voltage ripple of 6
And the ripple amount information output from the ripple detection circuit 6 is received, it is determined whether the ripple amount exceeds a predetermined value, and the information signal of the ripple amount and the information signal added to it are output according to the determination result. The microcomputer 7 and the data generating circuit 8'which generates information according to the information signal output from the microcomputer 7.

In the case of a plurality of electronic devices, the system configuration may be a combination of electronic devices of different types such as a television camera and other electronic devices. Further, in the embodiments of FIGS. 1 to 3, the character data is superimposed on the video signal and output or transmitted, but the character data may be output or transmitted independently. Further, any data may be used as long as it is data to be transmitted as shown in FIG. 4 instead of a video signal, and may be a symbol or an identification code instead of being superimposed as character data.

[0016]

As described above, according to the present invention, the ripple detection circuit 8 outputs a detection signal even when the amount of power supply ripple increases due to the aging of the aluminum electrolytic capacitor, and the word "capacitor replacement" is displayed. Since it is superimposed on the video signal, it is possible to realize an electronic device using a power supply circuit that allows the operator to visually confirm the proper time to replace the aluminum electrolytic capacitor.

[Brief description of drawings]

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention.

FIG. 2 is a block diagram showing a schematic configuration of a second embodiment of the present invention.

FIG. 3 is a block diagram showing a schematic configuration of a third embodiment of the present invention.

FIG. 4 is a block diagram showing the configuration of an embodiment of the present invention.

[Explanation of symbols]

1: Lens, 2: Solid-state image sensor, 3: Preprocessing circuit,
4: A / D converter, 5: DSP, 6: Ripple detection circuit,
7: Microcomputer, 8: Character generation circuit, 8 ': Data generation circuit, 9: Power supply circuit, 10: Combiner, 11, 11-1, 1
1-2, ..., 11-N, 11'-1, 11'-2, ..., 11'-
N: TV camera, 11 ': Electronic device, 12: Data bus, 13, 13-1, 13-2: Monitor, 14: Internet line.

Claims (7)

[Claims] 1. An electronic device having at least one power supply circuit, wherein each of the detection means detects a ripple amount of a power supply generated by the power supply circuit, and the ripple amount detected by the detection means exceeds a predetermined value. An electronic device comprising: a means for determining whether or not it is generated, a generation means for generating information based on a determination result of the determination means, and an output means for outputting the information generated by the generation means. 2. In an electronic device having at least one power supply circuit, detection means for detecting a ripple amount of a power supply generated by the power supply circuit, and ripple amount detected by the detection means exceed a predetermined value. And a means for generating information when the ripple amount exceeds a predetermined value by the determination means, and an output means for outputting the information generated by the generation means. An electronic device characterized by. 3. The electronic device according to claim 1, wherein the output unit is a display unit and displays the information in characters. 4. The electronic device according to claim 1, wherein the output unit is a voice output unit, and outputs the information by voice. 5. The electronic device according to claim 1, further comprising a transmission unit that transmits the information generated by the generation unit, and the output unit includes the transmission unit. An electronic device which outputs the information transmitted by the electronic device. 6. The electronic device according to claim 5, wherein the transmission means is an Internet line. 7. The electronic device according to claim 1, wherein the information further includes a device name, an identification number, a product name, an installation place, an installation date, a product number of the electronic device, At least one of lot number, manufacturer name, power supply circuit identification number, product name, installation location, installation date, product number, lot number, manufacturer name, and history of aluminum electrolytic capacitor replacement is added. Electronic device.