JPS6389025A - Time limiter of electric equipment - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention particularly relates to a timer for electrical equipment, such as high-voltage equipment, which is used in accordance with its service life, inspection and replacement period.

10) Conventional technology For example, a steam sterilizer as shown in Japanese Utility Model Publication No. 6O-4J961 performs sterilization by filling a chamber with high-temperature, high-pressure steam. Each time, the temperature and pressure are high, which is extremely dangerous.

For this reason, the service life of the chamber is set in advance, and when that time comes, the chamber is replaced or the necessary parts are replaced2.

However, when determining whether it is time for service life, inspection, or replacement, the user must always check the equipment's instruction manual, etc. In such cases, there was a risk that pressure would be released from the most severely deteriorated parts of the chamber, or that the chamber would be damaged.

Incidentally, this kind of danger is extremely common not only in steam sterilizers but also in equipment whose performance is greatly affected by long-term use, such as equipment that uses a heat source or equipment that has a significant impact on the human body. ing.

(c) Problems to be Solved by the Invention According to the present invention, the operation of the equipment is stopped or a notification is given by an alarm when the equipment body reaches the end of its useful life or is due for inspection or replacement.

(b) Means for Solving the Problems The present invention includes a device body having a control circuit for controlling a load, a battery, and a voltage detection circuit for detecting the voltage across the battery, and detecting the voltage. When the circuit detects that the voltage across the battery has decreased to a value commensurate with the service life of the main body of the device or the period of inspection or replacement, the operation of the control circuit is stopped or a notification is given by an alarm. .

(E) Operation When the voltage across the battery falls to a value commensurate with the service life of the device or the time for inspection or replacement, the operation of the control circuit is stopped to prevent a dangerous situation, or an alarm is activated. This is to notify the user.

(f) Example An embodiment of the present invention will be described based on FIG.

(This is the 11-piece steam sterilizer main body, which has the following parts. (2) is a heater with a load below C connected to the AC power source (3)), (41 is a control circuit that controls the heater, for example A chamber (not shown) provided in the device body m
It detects the temperature or pressure inside the tank and maintains the saturated vapor pressure. (5) The heater (21 is set to 0N-O
A drive circuit that turns FF and includes a resistor (6), a first transistor (7), and a power relay (81) connected in series with the first transistor.This power relay (8) switches the heater when the transistor (7) is turned on. (21
Turn on the contact (9) connected in series with.

α[ is a small battery such as a lithium battery, (1+ is a voltage detection circuit that detects the voltage across the battery, and a control circuit (
4) and a first comparator (lz) that determines whether to stop the operation of the control circuit and an annunciator 081 (such as an LED).
The second comparator (1'
Compared to the second comparator U, the output of the second comparator U is inverted faster. 0
10shi, a6! is a resistor connected in series with each other, and the resistor (
The connection between the resistor I and the resistor (19) is connected to the non-inverting input terminal of the second comparator (131).

Additionally, the positive electrode of the battery carrier is connected to the inverting input terminal of each of the first and second comparators a3.0. Shizuha said LEDf
In the operating circuit of i81, the resistor (19) and the resistor t211 of the second transistor connected to the LED KlIf column (
It consists of 2'J. ta, (241 is the first
, second comparator (12, (connected between each non-inverting input terminal and output terminal of IJ and serving as a resistor for stabilizing the specific output. (251)
Fi is a set relay called a keep relay that has two coils I2 (to), one contact and one contact @, and when one coil α- is energized, the contact @ switches from ON to OFF, and the other coil opens. When energized, the contact (to) turns OFF.
It switches from F to ON, and the - degree contact t2s is O.
After switching from N to OFF or from flOFF to ON, the state is maintained even if the current to the coil □ or □ is stopped. (2) is a relay switch in which the first contact ω is connected to one coil (2), the second contact C (11) is connected to the other coil (2), and the common contact (to) is connected to the power source of the device body (1). The port is a discharge resistor connected between the battery α0 and the contact point .

Figure 2 shows the discharge characteristic diagram of the battery αO, and it is possible to obtain a discharge time (set to 3 years in the example) commensurate with the service life of the main body (1) of the device or the period of inspection and parts replacement. Similarly, the discharge resistance ω is set to an appropriate value.

Next, the operation will be described. When the device body (1) is shipped, the common contact area of the relay switch (2) is connected to one of the coils (2), and the coil is energized to turn off the contact (2). After this, even if the power to the device body (1) is stopped, the contact ■ remains OFF.
Maintain F state.

After the device body (1) is delivered to the user and installed, connect the common contact (to) of the relay switch ■ to the other coil, energize the coil, and connect the contact @″f:ONf:ON state discharge resistor field. A battery (IG) discharge circuit is formed by a series circuit with contact point (3).

Therefore, in the initial state, since the voltage across the battery α1 is high, the potential of the inverting input terminal of the first comparator α2 (comparison potential)
becomes higher than the potential of the non-inverting input terminal (reference potential), and its output terminal becomes an "L" output, allowing the control circuit (4) to perform sterilization operations in a normal state. That is, for example, when the temperature inside the chamber reaches a predetermined temperature, the operation of the drive circuit (5+ is stopped, the power relay (81) is deenergized, and the contact (91i 0 F F is set to maintain the inside of the chamber at saturated vapor pressure. At this time, the potential of the inverting input terminal (comparison potential) of the second comparator αJ is also higher than the potential of the non-inverting input terminal (C base potential), and its output terminal outputs "L" and the LED (Is lights up). do not.

Eventually, due to long-term use, the voltage across the stain pond a1 decreases, and when the service life of the main body (1) of the device approaches or the time for inspection or conversion approaches, the voltage across the battery section decreases, for example, when the service life is reached. When it reaches a value corresponding to the previous half year ago (two and a half years),
When the comparison potential of the second comparator (131 is lower than the reference potential), the ψ output terminal becomes rHJ, the operating circuit (4) is activated, and the LED fi8 lights up, indicating that the service life of the device (11) is approaching. inform.

In this way, the user can take measures such as replacing the device (1) during the lighting period of the LED α barrel, but if necessary measures are taken during this period, it is necessary to use the device continuously. In this case, the voltage across the battery section further decreases, and eventually the multi-output terminal of the first comparator (1z, whose comparison potential is lower than the reference potential) becomes rHJ and is input to the control circuit (4).
The control circuit controls the drive circuit (5) to energize the seat (8) and cut off the power to the heater (21).

In addition, although the present invention has described changes in battery terminal voltage in the order of advance notice before reaching the end of the service life of the device body and power cutoff to the heater after the end of the service life, it is simply a change in the terminal voltage of the device. may only notify when it is time to replace parts, or
It may be possible to cut off the power to the heater directly at the end of its service life without prior notice.

(G1) Effects of the Invention As described above, the present invention is capable of stopping the operation of the control circuit or using an alarm when the voltage across the battery drops to a value that is commensurate with the service life of the device or the time for inspection or replacement. Since this notification eliminates the need for the user to constantly check the end of the service life using manuals, there is no danger of the device being damaged if the end of the service life is reached.Dad, the voltage across the battery decreases. Since this can be changed depending on the value of the discharge resistance, the notification or operation can be stopped depending on the service life of the main body of the device used, inspection, and parts replacement timing.

[Brief explanation of the drawing]

The first factor is an electric circuit diagram showing an embodiment of a timer for an electric device according to the present invention, and FIG. 2 is a diagram showing the discharge characteristics of a battery. fli...Device body, +21...Load, (4)
...Control circuit, αG...Battery, (111-...Voltage detection circuit, -Discharge resistor Applicant: 1 other person from Sanyo Electric Co., Ltd. Representative patent attorney Takuji Nishino (1 other person) Fig. 2

Claims (2)

[Claims] (1) A device body having a control circuit that controls a load, a battery, and a voltage detection circuit that detects the terminal voltage of the battery; Alternatively, a timer for electrical equipment is characterized in that when it is detected that the value has decreased to a value appropriate for inspection or replacement, the operation of the control circuit is stopped or a notification is given by an alarm. (2) The voltage across the battery is lowered through a discharge resistor connected in series with the battery, and the value of the discharge resistor is set according to the service life of the device or the period of inspection and replacement. A timing device for electrical equipment as set forth in claim 1.