JPH05135827A - Electric apparatus with ac plug - Google Patents

Abstract

PURPOSE:To prevent an overheating of an AC plug and to increase the safety. CONSTITUTION:A thermister 13 is provided in an AC plug 10 installed in an AC plug socket in order to use a commercial powder source, the temperature detecting data from the thermister 13 is calculated, and the controller in an apparatus main body decides whether the temperature is an abnormal value or not, and when the temperature becomes abnormal, a LED 18 is made to display as to an abnormal temperature, or the operation of the apparatus main body is regulated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric device having an AC plug which uses a commercial power source such as a facsimile machine and office equipment.

[0002]

2. Description of the Related Art As a power source of a conventional facsimile apparatus, a commercial power source is usually supplied, and in this case, the power source is supplied to a power source circuit in the facsimile apparatus through an AC (alternating current) plug to supply power. In the circuit, the voltage necessary for the facsimile machine is generated and used. The facsimile machine has a scanner, plotter, and motor
Since it is equipped as an O (input / output) device and consumes a large amount of power, it is necessary to secure safety related to power sources, and various safety devices have been proposed and implemented.

[0003]

At present, facsimiles have begun to be used in ordinary households, and when used in ordinary households, ordinary consumers may install the facsimiles. Power is supplied from one outlet to many home electric appliances without considering the above, and the outlet and AC plug become hot when used in the condition of so-called octopus wiring, and if this use condition continues smoking or ignition There is a problem that there is a possibility of. But,
Conventionally, there has been no device that controls the temperature of the AC plug.

An object of the present invention is to provide an electric device having an AC plug with high safety by preventing overheating of the AC plug.

[0005]

In order to achieve the above object, the present invention provides a temperature detecting means for detecting the temperature of an AC plug in an electric equipment equipped with an AC plug which uses a commercial power source through an AC outlet. And a comparator for calculating temperature data from the temperature detecting means to compare whether or not the temperature is within a safe temperature range, and a signal indicating that the temperature is out of the safe temperature range from the comparing means, and a temperature abnormality is detected. Notification concerning
Alternatively, it is provided with means for restricting the operation of the device body.

Further, the temperature detecting means is configured to contact the two terminals of the AC plug at the same time to detect the temperature.

Further, it is characterized in that it receives a signal indicating that the temperature is out of the safe temperature range from the comparing means, shuts off the main power source of the electric equipment main body, and can notify the temperature abnormality.

Further, the AC plug is provided with a temperature abnormality display means.

[0009]

According to the above means, when the comparing means receives the temperature data from the temperature detecting means and determines that the temperature of the AC plug has risen above a predetermined safe temperature range,
Since notification of temperature abnormality or operation restriction of the device body is performed, smoke and ignition from the AC plug can be prevented,
Safety is improved.

Since the temperature detecting means is in contact with the two terminals of the AC plug, the temperature detecting accuracy is improved.

When the temperature of the AC plug becomes abnormal,
By turning off the main power supply of the electric device body and only reporting the temperature abnormality, the safety is further improved and the cause of the main power supply OFF can be known.

Further, by displaying the temperature abnormality on the AC plug, for example, even in the octopus wiring state, the abnormality can be easily found only by looking at the plug.

[0013]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 4 is a block diagram showing the configuration of a facsimile apparatus according to an embodiment of the present invention. 1 is a scanner for reading document information, 2 is a plotter for printing image information, and 3 is compression of image information. A decompressing encoding / decoding unit, 4 is a communication control unit for performing facsimile communication, 5 is a modem for modulating / demodulating communication data, 6 is a network control unit for connecting to a line, and 7 is an abnormality as described later. An operation display unit 8 for displaying an abnormality to the operator at the time of temperature or performing a predetermined facsimile operation, as will be described later, determines a temperature abnormality by comparing with a temperature measurement and a threshold value, and further performs a predetermined facsimile operation. It is a system control unit.

FIG. 1 is a block diagram of the above-mentioned facsimile apparatus.
It is a block diagram which shows an example of a C plug, and is an AC outlet 9.
A thermistor 13, which is a temperature detecting means, is provided between two publicly known terminals 11 and 12 inside the AC plug 10 which obtains a commercial power source by being fitted to the system control section 8 of the facsimile main body. Connected to each other.

FIG. 2 is a block diagram showing another example of the AC plug, in which a protruding portion is formed on a part of the two terminals 16 and 17 of the AC plug 10.
16a and 17a are provided, and the thermistor 13 is brought into contact with both the projecting portions 16a and 17a so that the temperature can be detected more reliably from the terminals 16 and 17.

In the AC plugs shown in FIGS. 1 and 2, the temperature data from the thermistor 13 is sent to the system controller 8.
The system controller 8 calculates and compares whether or not the temperature inside the AC plug 10 has risen to a temperature above a predetermined safe temperature range. When the system control unit 8 determines that the temperature is abnormal, the system control unit 8 controls the operation and display unit 7 to display an abnormality or stop the operation of the facsimile body.

FIG. 3 is a block diagram showing another example of the AC plug. The AC plug 10 of FIG. 1 is provided with an LED (light emitting diode) 18 which is a temperature abnormality display means for displaying a temperature abnormality. Has been.

FIG. 5 is an explanatory view showing a related configuration of the AC plug of FIG. 3 and a comparison circuit provided in the facsimile main body, and 20 is for converting a change in resistance value of the thermistor 13 into a change in potential. Voltage dividing resistor, 21 is A / D that converts the potential at the voltage dividing point (point A) into analog / digital data for temperature data
(Analog / digital) converter, 22 is a CPU (central processing unit) for comparing temperature data with a threshold value, 23 is a RAM of a memory used by the CPU 22 for calculation, and 24 is a program for the comparison. ROM of memory, 25 is the LED
A driver for driving 18 (switching transistor), 26 is an I / O port, 27 is a current limiting resistor of the LED 18, 28 is a power source, and this circuit is the system control unit 8
It is provided independently of.

FIG. 6 is a temperature-resistance value characteristic diagram of the thermistor 13. In the present embodiment, the thermistor 13 used has the characteristic that the resistance value decreases as the temperature rises.

FIG. 7 is an explanatory diagram showing changes in the potential at the point A of the comparison circuit of FIG. 5. In this embodiment, the temperature inside the AC plug 10 is up to about 40.degree. If the temperature exceeds the threshold, the temperature is abnormal, and thresholds TH1 and TH2 relating to temperature data in two stages are set at two temperatures of about 40 ° C. and 50 ° C.

FIG. 8 is a flowchart relating to the processing by the above comparison circuit. This processing flow is executed at fixed time intervals by interruption, and first, the thermistor 13 detects the potential at point A in FIG. After this (S1), this potential is A / D converted by the A / D converter 21 to obtain temperature data T (S2). Next, the CPU 22 compares the temperature data T with the thresholds TH1 and TH2, and T > TH2 (YES in S3), turn off the main power of the facsimile main body (S
4), temperature abnormality display by LED18 or alarm by buzzer is issued (S5). When T> TH1 (YES in S6), the temperature abnormality display or alarm is given (S6).
5) Call attention to the operator. According to the display of the LED 18, even if there are many AC plugs, the AC plugs in which the temperature is abnormal can be immediately and easily found.

The function of the above-mentioned comparison circuit can be performed by the system control unit 8 in FIG. 4, but in the step (S4)
In the case of the configuration in which the main power source of the facsimile main body is turned off as described above, it is necessary to install the system control unit 8 and the comparison circuit separately.

[0024]

As described above, according to the present invention,
By detecting whether or not the AC plug is in a safe temperature range and notifying that the temperature becomes abnormal or restricting the operation of the device body, it is possible to prevent smoking and ignition of the AC plug, and the temperature detection means Since the two terminals of the AC plug are in contact with each other, the accuracy of temperature detection can be improved, and when the AC plug reaches an abnormal temperature, the main power supply of the electric device main body is turned off to further improve safety. In addition, since the display concerning the abnormal temperature is displayed on the AC plug, the AC plug in the abnormal temperature state can be easily identified, and the cause of the main power off can be immediately known.
It is possible to provide an electric device having a highly safe AC plug that prevents the C plug from overheating.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an example of an AC plug in a facsimile apparatus according to an embodiment of the present invention.

FIG. 2 is a configuration diagram showing another example of an AC plug.

FIG. 3 is a configuration diagram showing another example of an AC plug.

FIG. 4 is a block diagram showing a configuration of a facsimile apparatus which is an example of an electric device having an AC plug of the present invention.

5 is an explanatory diagram showing a related configuration between the AC plug of FIG. 3 and a facsimile main body. FIG.

FIG. 6 is a temperature-resistance value characteristic diagram of the thermistor.

7 is an explanatory diagram showing changes in potential at point A of the comparison circuit of FIG.

8 is a flowchart relating to processing by the comparison circuit of FIG.

[Explanation of symbols]

7 ... Operation display section (temperature abnormality display means), 8 ... System control section (comparison means), 9 ... AC (AC) outlet, 10 ...
AC plug, 11, 12, 16, 17 ... Terminal, 13 ... Thermistor (temperature detection means), 18 ... LED (temperature abnormality display means),
22 ... CPU (comparing means), 23 ... RAM, 24 ... RO
M.

Claims (4)

[Claims] 1. In an electric device equipped with an AC plug that uses a commercial power source via an AC outlet, temperature detection means for detecting the temperature of the AC plug and temperature data from this temperature detection means are calculated to ensure safety. Comparing means for comparing whether or not in the temperature range, and a signal indicating that the temperature is out of the safe temperature range from the comparing means, and reporting the temperature abnormality,
Alternatively, an electric device having an AC plug, which is provided with means for restricting the operation of the device body. 2. The temperature detecting means is the AC plug 2
The electrical device having an AC plug according to claim 1, wherein the electrical device is configured to be in contact with one terminal at the same time to detect the temperature. 3. The main power source of the electric device main body is shut off in response to a signal indicating that the temperature is out of a safe temperature range from the comparison means, and a notification regarding a temperature abnormality can be issued. An electric device comprising the AC plug according to claim 1. 4. An electric device having an AC plug according to claim 1, wherein the AC plug is provided with a temperature abnormality display means.