JPH06245002A - Facsimile equipment - Google Patents

Abstract

PURPOSE:To inform abnormality and to predict the service life of a power source when the output voltage of a electrolytic capacitor drops. CONSTITUTION:An A/D converter 1 converts the output voltage of the electorolytic capacitor of a switching power source part to a digital signal to send it to a facsimile constrol part 2. When the output voltage of the electrolytic capacitor is not more than a threshold value, a display part 3 displays the generation of abnormality. A memory 4 stores elapse of time data of the output voltage and a speaker 5 issues an alarm. Thus, a facsimile equipment provided with the detecting function of the capacitor deterioration of power source is realized.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a facsimile machine, and more particularly to a facsimile machine having a power source deterioration detection function. For example, it is applied to an electronic device using a telephone line.

[0002]

2. Description of the Related Art As a known document describing the prior art of the present invention, there is, for example, Japanese Patent Laid-Open No. 4-36666. The one disclosed in this publication is a power source to which a capacitor is connected via a rectifier, and is provided with a peak hold circuit and an arithmetic unit for measuring and calculating an average value of the output voltage of the capacitor and the output voltage of the peak hold circuit. It is a thing. However, the life of the power supply is mainly determined by the deterioration of the electrolytic capacitor, and the life can be detected by monitoring the output voltage of the electrolytic capacitor of the power supply. However, since these things have not been done, the abnormality of the power source starts to be detected, and at this time, there are cases where problems such as flame and ignition, and interruption of the facsimile occur.

[0003]

[Purpose] The present invention has been made in view of the above situation, and predicts the life of a power supply by notifying an abnormality by a display or an alarm sound when the output voltage of an electrolytic capacitor becomes smaller than a set threshold value. Moreover, by knowing the time-dependent data of the output voltage of the electrolytic capacitor, it is possible to predict the occurrence of an abnormality, and further, when the failure occurs, the time-lapse data stored in the memory is transferred to a central data collection center or the like by a telephone line, It is also an object of the present invention to provide a facsimile device that calls up a facsimile device from a central data collection center when necessary and receives time-lapse data stored in a memory to improve the efficiency of maintenance of deterioration of power source parts. It was made.

[0004]

In order to achieve the above object, the present invention provides (1)
In a facsimile machine equipped with a power source using an electrolytic capacitor charged by a rectified output current from a rectifying circuit, a detecting unit for detecting an output voltage of the electrolytic capacitor and an output voltage detected by the detecting unit are preset. When the value falls below the threshold value, there is a notification means for notifying an abnormality by a display and an alarm sound, and a function for detecting deterioration of the capacitor of the power supply is provided.
(2) The temporal data of the output voltage can be stored in a memory in the apparatus, and the stored data can be printed out from the printing unit of the apparatus when necessary, and further, (3) the above (1) or (2)
In this case, the time data of the output voltage stored in the memory in the apparatus by the notifying means when an abnormality occurs can be transferred to the central data collection center via the telephone line, and the facsimile machine is called from the central data collection center when necessary. It is characterized in that it is possible to receive the time-lapse data stored in the memory. Hereinafter, description will be given based on examples of the present invention.

FIG. 1 is a block diagram for explaining an embodiment of a facsimile apparatus according to the present invention, in which 1 is an A / D.
A conversion unit, 2 is a facsimile control unit, 3 is a display unit, 4 is a memory, 5 is a speaker, 6 is a network control unit, 7 is a handset, and 8 is a plotter unit. The A / D conversion unit 1 converts the output voltage of the electrolytic capacitor of the switching power supply unit into a digital signal and sends it to the control unit 2. The display unit 3 displays the occurrence of an abnormality when the output voltage of the electrolytic capacitor becomes less than or equal to the threshold value. The memory 4 stores temporal data of the output voltage. The speaker 5 produces a warning sound. The network control unit 6 connects a telephone line or the like.

FIG. 2 is a block diagram of the switching power supply section.
In the figure, 11 is a commutator, 12 is an electrolytic capacitor, 13 is a switching element, and 14 is a transformer. Commutator 11
Rectifies the AC input. The electrolytic capacitor 12 temporarily stores the output of the commutator 11. The switching element 13 is
It is a switching element.

Next, the operation will be described. The current rectified by the commutator 11 is stored in the electrolytic capacitor 12, and the cycle of discharging the load is repeated. The charging / discharging voltage waveform (voltage waveform across the electrolytic capacitor) is shown in FIGS. The output voltage across the electrolytic capacitor 12 is as shown in FIG.
It has a flat waveform as shown in (a). The voltage across the electrolytic capacitor 12 is digitally converted by the A / D converter 1 and compared with a threshold value preset by software. The threshold value is a predetermined value, which is a value for determining that the life is near, and is preset by software. The output voltage is
In the case of the initial capacitor, it is flat as shown in FIG. 3A, but as the deterioration progresses gradually and the capacity of the electrolytic capacitor 12 decreases (capacity deterioration) (FIG. 3B).
(C)), the average output voltage generated across the electrolytic capacitor 12 gradually decreases.

When the output voltage becomes smaller than the preset threshold value (FIG. 3 (c)),
An abnormality is displayed on the display unit 3 and a warning sound is generated from the speaker 5 to inform that the failure due to the deterioration of the electrolytic capacitor 12 is approaching. At the same time, the central control center is called from the fax and the time-lapse data stored in the memory 4 is sent out. It is also possible to store the output voltage in the memory 4 and print it from the plotter unit 8 of the facsimile machine when necessary. It is also possible to call a facsimile machine from the central control center when necessary and receive the time-lapse data stored in the memory 4.

Next, how to determine the threshold value will be described. When the capacity of the electrolytic capacitor deteriorates, the current (ripple current) flowing into the electrolytic capacitor increases in an attempt to keep the output voltage constant. This ripple current is
As the capacity decreases, the voltage increases in an attempt to keep the voltage constant. The ripple current shows a peak value in the valley of the voltage as shown in FIG. The allowable value of the ripple current is a value specific to the electrolytic capacitor and is a value presented by the manufacturer. If you use beyond the allowable ripple current,
The electrolytic capacitor heats up remarkably, further accelerating the life. This ripple current can be measured with an oscilloscope via a current probe, and the capacitance of the electrolytic capacitor has been experimentally reduced to obtain the average value of the output voltage (voltage across the electrolytic capacitor) when the allowable ripple current is reached. Use as a threshold value.

Next, the life of the electrolytic capacitor will be described. Aluminum electrolytic capacitors have a larger loss than other capacitors and therefore generate internal heat due to ripple current. Since the heat generated by the ripple current is accompanied by the temperature rise, this value greatly affects the life. Therefore, the maximum allowable ripple current is set. The heat generated when the ripple current is applied is expressed by the following equation. W = I _R ² · R + VI _L (1) W: Internal power consumption I _R : Ripple current R: Internal resistance (equivalent series resistance) (2) V: Applied voltage I _L : Leakage current

The leakage current (I _L ) is 20 ° C. at the maximum operating temperature.
However, since I _R >> I _L , W≈I _R ² · R (3). I _R ² · R = βAΔT (4) β: Heat dissipation constant A: With case surface (cm ² ) A = π / 4D (D + 4L) D: Diameter of case (cm) L: Length of case (cm) ΔT: Temperature rise due to internal heat generation (° C) is established. From equation (4), the heat generated by the ripple current is

[0012]

[Equation 1]

It is represented as The internal heat generated by this ripple current and the ambient temperature have different degrees of influence on the life. The applicable range varies depending on the shape of the capacitor and the usage conditions, but the acceleration rate for internal heat generation is approximately doubled at 5 to 10 ° C. This relational expression is expressed by Expression (6).

[0014]

[Equation 2]

Next, claim 3 will be described. In the fax of the collection center, the user mode is entered and the non-standard function frame: NSF (Non-Standard Facilities:
A bit is set to a specific bit of the non-standard function identification signal) so that the time-lapse data stored in the fax memory can be received. On the other hand, in the fax mode as well, the user mode is similarly entered, and a bit is set in a specific bit of the NSF so that the time-lapse data stored in the memory can be transmitted. It is assumed that these functions are added to both faxes by software.

FIG. 4 is a diagram showing a reception flow in claim 3. Hereinafter, each step will be described in order.
First, on the receiving side, it is judged whether or not a bit is set in a specific bit of NSF (step 1). If the bit is not set, the bit is set (step 2). Next, on the transmitting side, it is determined whether or not a bit is set in a specific bit of NSF (step 3), and if the bit is not set, the bit is set (step 4). Next, the receiving side makes a call to the facsimile machine. Next, the transmitting side judges whether or not the specific bit of the NSF of the transmitting side is recognized (step 6), and if it is recognized, then the temporal data in the memory is transmitted (step 7) and the receiving side receives it. Yes (step 8).

FIG. 5 is a flow chart for explaining the operation of the facsimile apparatus according to the present invention. Hereinafter, each step will be described in order. step1 ; First, the output voltage of the capacitor is A / D converted. step2 ; Next, it is determined whether or not time-lapse data is stored in the memory. If you do not memorize it, step 4 described later
Go to step3 ; If the information is stored in step 2,
The temporal data of the output voltage is stored in the memory. step4 : If not stored in step 2, then it is determined whether the A / D output has dropped below the threshold value. If the A / D output has not dropped, go to step 9 described later. step5 : If the A / D output is lowered in the step 4, an abnormal display is displayed on the display unit.

[0018]step6; Next, an alarm is given by the speaker
generate.step7 ; Next, at the same time when an alarm occurs,
Determine whether to call. If you call
Go to step 13 to be mentioned.step8 If you don't call it in step 7
For example, the abnormal voltage is stored in the memory.step9 ; Next, determine whether to print out the elapsed data.
Refuse. If you do not print out, step 1 described later
Go to 2.step10 The output is printed in step 9
Data is output from the memory and sent to the plotter.
Itstep11 Print next.step12 ; In step 9 above, no printout is made, so
If so, whether to send the time-lapse data over the line next
To judge. If it is not sent, the process ends. step13 If it is sent in step 12 above
For example, the FAX of the central control center is called.step14 ; Next, save the time-lapse data or abnormal data from the memory
Output, send and end.

[0019]

As is apparent from the above description, the present invention has the following effects. (1) Effect corresponding to claim 1: The output voltage of the electrolytic capacitor is detected, and when the output voltage falls below a set threshold value, an abnormality is notified, so that the power supply malfunctions due to deterioration of the electrolytic capacitor. It is possible to detect the fullness of the parts early and reliably before the occurrence of the problem and prevent them. (2) Effect corresponding to claim 2: The time-dependent data of the output voltage is stored in the memory in the facsimile apparatus, and the time-dependent data can be printed when necessary, so that data such as prediction of component deterioration or abnormality occurrence can be known. Because it is possible, it is useful for maintenance. (3) Effect corresponding to claim 3: When an abnormality occurs in (1), the time-lapse data stored in the memory of the facsimile can be transferred to a central data collection center or the like by a telephone line, and when necessary. Since it is also possible to call a facsimile from the central data collection center and receive the time-lapsed data stored in the memory, it is possible to know the status of the deterioration of the parts of the power supply without the need for a service person to visit the user.

[Brief description of drawings]

FIG. 1 is a configuration diagram for explaining an embodiment of a facsimile apparatus according to the present invention.

FIG. 2 is a configuration diagram of a switching power supply unit according to the present invention.

FIG. 3 is a diagram showing a relationship between a change in output voltage and a ripple current due to deterioration of the electrolytic capacitor according to the present invention.

FIG. 4 is a diagram showing a reception flow in claim 3 of the present invention.

FIG. 5 is a diagram showing a flow for explaining the operation of the facsimile apparatus according to the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... A / D conversion part, 2 ... Facsimile control part, 3 ... Display part, 4 ... Memory, 5 ... Speaker, 6 ... Network control part, 7 ... Handset, 8 ... Plotter part.

Claims (3)

[Claims] 1. A facsimile apparatus equipped with a power source using an electrolytic capacitor charged by a rectified output current from a rectifying circuit, a detecting unit detecting an output voltage of the electrolytic capacitor, and an output detected by the detecting unit. A facsimile apparatus comprising a notification means for notifying an abnormality by a display and an alarm sound when a voltage falls below a preset threshold value, and having a function of detecting deterioration of a capacitor of a power supply. 2. The facsimile apparatus according to claim 1, wherein the time-dependent data of the output voltage is stored in a memory in the apparatus, and the stored data can be printed out from the printing unit of the apparatus when necessary. 3. The time-series data of the output voltage stored in the memory of the apparatus when an abnormality occurs by the notifying means can be transferred to a central data collection center via a telephone line, and the central data collection center can facsimile the data when necessary. 3. The facsimile apparatus according to claim 1, wherein the facsimile apparatus is capable of calling the apparatus and receiving time-lapse data stored in a memory.