JPS6238358Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is a communal viewing device equipped with an uninterruptible power supply device, which is operated by a commercial AC power source, or a storage battery equipped with the power supply device. The present invention relates to a device for confirming whether the device is operating or not.

Conventionally, communal viewing equipment has a configuration as shown in Figure 1, and the components of these communal viewing equipment, such as a head amplifier 1, branch amplifiers 2, 2, etc., are connected to a main line 3 or a coaxial cable. Branch line 4, 4...
It operates with a power supply superimposed on the Superimposition of power is performed by uninterruptible power supply devices 5,5.
As shown in Figure 2, this uninterruptible power source supply device
Under normal conditions, the commercial AC voltage supplied to the input terminals 6, 6 is transformed to an appropriate size by the transformer 7 and supplied to the main line 3. In the event of a power outage, the input terminals 8, 8 are connected to a storage battery (not shown). ) is converted into an alternating current voltage by an inverter 9 and supplied to the main line 3 via a transformer 7.

If the fuse 10 of the uninterruptible power source supply device is blown by mistake during the installation work or adjustment of such a communal viewing system, the inverter 9 will automatically start operating, and the worker will be given the option to operate using the storage battery. Accidents have occurred in which people do not know that the system has started and return home, but two to three hours later the storage battery discharges and the communal viewing system becomes inoperable.

The purpose of this invention is to prevent the above-mentioned accidents. Therefore, when the communal viewing equipment is operated on commercial AC power, the superimposed voltage is a sine wave, and it is operated on an inverter. In this case, focusing on the fact that the superimposed voltage is a rectangular wave, the design is such that the indicating device is driven when the superimposed voltage is a rectangular wave.

This invention will be explained in detail below based on one embodiment shown in FIGS. 3 and 4. FIG. 3 is a block diagram of the verification device according to this invention. In the figure, 20 and 20 are input terminals of this confirmation device, and the first
A low-pass filter 28 consisting of RFCs 22, 24 and a capacitor 26 extracts the sine wave voltage or rectangular wave voltage shown in FIG. do. This extracted voltage is converted into a direct current by a resistor 30, a rectifier diode 32, a smoothing capacitor 34, and a Zener diode 36, and a light emitting diode 38
is supplied to the collector of the NPN transistor 40 via.

The voltage extracted by the low-pass filter 28 is supplied to a differentiating circuit 46 consisting of a capacitor 42 and a resistor 44. When the extracted voltage is a sine wave voltage, the output voltage of the differentiating circuit 46 is selected to be 0 as shown in FIG. 4b. For example, the capacitor 42 may be selected to have a value of 0.033 μF, and the resistor 44 may be selected to have a value of 1KΩ. Therefore, the output of the rectifying and smoothing circuit 58, which is connected to the output side of the differentiating circuit 46 and includes a rectifying diode 48, a low resistor 50, a smoothing capacitor 52, a resistor 54, and a Zener diode 56, also becomes 0.

The output of the rectifying and smoothing circuit 58, which is 0, is connected to one input side of a NAND circuit 70 that constitutes an oscillation circuit 68 together with a NAND circuit 66 whose human outputs are connected by a time constant circuit 64 consisting of a resistor 60 and a capacitor 62. is supplied to Note that the other input side of the NAND circuit 70 is connected to a connection point between the resistor 60 and the capacitor 62, and the output side of the NAND circuit 70 is connected to the input side of the NAND circuit 66. Therefore, the output of the NAND circuit 70 becomes "1", which is supplied to the base of the transistor 40 via the resistor 72, so the transistor 40 becomes conductive and the light emitting diode 38 lights up.

Further, if the voltage extracted by the low-pass filter 28 is a rectangular wave voltage as shown in FIG. 4c,
The output voltage of the differentiating circuit 46 becomes a positive and negative pulse voltage as shown in d of the figure. These pulse voltages are converted into DC by a rectifying and smoothing circuit 58, and are converted into DC by a NAND circuit 7.
0 to one input. As a result, the oscillation circuit 68 starts operating, the output of the NAND circuit 70 alternates between "1" and "0", and the light emitting diode 38 blinks.

Further, the output of the NAND circuit 66 is connected to the oscillation circuit 80 together with the NAND circuit 80 whose input and output are coupled by a time constant circuit 78 consisting of a resistor 74 and a capacitor 76.
The signal is supplied to one input side of a NAND circuit 84 constituting the circuit 2. Note that the other input side of the NAND circuit 84 is connected to the connection point between the resistor 74 and the capacitor 76, and the output side of the NAND circuit 84 is connected to the input side of the NAND circuit 80. Therefore, the oscillation circuit 82 starts operating, and the piezoelectric buzzer 86 connected to the output side of the NAND circuit 80 intermittently generates an alarm sound.

Therefore, after the adjustment and construction of the joint viewing device shown in FIG. 1 is completed, the input terminals 20, 20 of the device shown in FIG. 3 or branch line 4, the light emitting diode 38 blinks and the piezoelectric buzzer 86
It can be seen that when the alarm sounds, the fuse 10 of the uninterruptible power source supply device shown in FIG. As a result, by immediately replacing the fuse, it is possible to prevent an accident in which the storage battery is discharged and the communal viewing device becomes inoperable.

In the above embodiment, the oscillators 68 and 82 and the transistor 40 are used to operate the light emitting diode 38 and the piezoelectric buzzer 86, but when the square wave voltage is superimposed, the voltage generated on the output side of the rectifying and smoothing circuit 58 is Various indicating devices can be used as long as they can be driven by DC voltage.

[Brief explanation of the drawing]

Figure 1 is a block diagram of a commonly used communal viewing device, Figure 2 is a block diagram of an uninterruptible power supply device used in the communal viewing device shown in Figure 1, and Figure 3 is a confirmation of this invention. The block diagram of the device, FIG. 4, is an output waveform diagram of each part of the device. 3, 4... Coaxial cable, 5... Uninterruptible intermittent power supply device, 28... Extracting circuit, 38, 86... Indicating device, 46... Differentiating circuit, 58... Rectifying and smoothing circuit.

Claims (1)

[Scope of utility model registration request] An uninterruptible supply device that generates an AC voltage obtained by transforming the commercial AC voltage when the commercial AC voltage is supplied, and generates a DC voltage changed to a rectangular wave voltage when the commercial AC voltage is not supplied. In a communal viewing device in which an amplifier driven by the alternating current voltage or square wave voltage superimposed on the signal transmitting coaxial cable is interposed in the signal transmitting coaxial cable, the alternating current voltage or the square wave voltage is superimposed on the signal transmitting coaxial cable. A circuit for extracting a rectangular wave voltage, and a time constant so that when the output of this extraction circuit is an alternating voltage, the output is almost 0, and when the output of the extraction circuit is a rectangular wave voltage, a positive and negative alternating pulse voltage is generated as an output. An operation confirmation device for a communal viewing device comprising an uninterruptible power source supply device comprising a selected differentiating circuit, a circuit for rectifying the output of the differentiating circuit, and an indicating device that operates in response to the output of this circuit.