JP2013106290A - Auxiliary power unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an auxiliary power unit capable of utilizing an optical signal leaking from a predetermined path of a modulated optical signal as electric power.SOLUTION: An optical signal leaking from a predetermined path of a modulated optical signal is converted into a useful electric energy, using a photoelectric conversion element that converts an optical signal into an electric signal and a conversion circuit that smooths a voltage according to a load, for example, and is made to serve as an auxiliary power supply.

Description

  The present invention relates to an auxiliary power supply apparatus, and more particularly to an apparatus for producing an auxiliary power supply using an optical signal and a photoelectric conversion element.

  An apparatus that converts light energy into electric power by using a photoelectric conversion element and uses it as a power source is widely used in, for example, a solar power generation system. Patent Document 1 describes a photovoltaic power generation system capable of charge / discharge management. Patent Document 2 describes a solar power generation system in which a plurality of solar panels are combined.

  On the other hand, the power source of an electric circuit used in a conventional television receiver has been made by converting a commercial power source from alternating current to direct current. In a television receiver using an optical video signal, when an optical light source or a modulated optical signal is used, there is an optical signal called leakage light that leaks from a predetermined path in the process of transmitting the optical signal. In this specification, the leaked light includes both an optical signal that is unintentionally leaked from a predetermined path or an optical signal that is intentionally removed from the predetermined path.

JP 58-86829 A JP 56-124062 A

  In a conventional television receiver using an optical light source or an optical signal, there is a problem that the leaked light changes to heat and becomes energy loss, so that power cannot be used effectively.

  Therefore, the present invention has been made to solve the above-described problems, and an object of the present invention is to provide an auxiliary power supply device that can effectively use the energy of leakage light as electric power.

  An auxiliary power supply device according to the present invention is an auxiliary power supply device disposed in a predetermined device having a modulated optical signal path, and is disposed in the vicinity of the optical signal path and leaks from the optical signal path. A photoelectric conversion element that receives the leaked light and converts it into an electric signal, and a conversion circuit that converts the electric signal output from the photoelectric conversion element into electric energy (supply power) for applying to a predetermined load.

  According to the present invention, the leakage light is received by the photoelectric conversion element to be converted into an electric signal, and further converted into electric energy for application to a predetermined load. For this reason, leakage light can be used effectively as electric power, and there is an effect of reducing power consumption.

FIG. 3 is a diagram for explaining a path of an optical signal according to the first embodiment. It is a figure which shows the average sunlight spectrum on the ground. It is a figure which shows the waveform of the modulated optical signal. 1 is a circuit diagram of an auxiliary power supply layer device according to Embodiment 1. FIG. It is a figure explaining the output characteristic of a photoelectric conversion element. It is a figure which shows the electrical signal output from the conversion circuit of this invention. 5 is a circuit diagram of an auxiliary power supply device according to Embodiment 2. FIG. 6 is a circuit diagram of an auxiliary power supply apparatus according to Embodiment 3. FIG.

<Embodiment 1>
<Configuration>
In the present embodiment, for example, a television receiver is considered as a predetermined device provided with an auxiliary power supply device.

  FIG. 1 schematically shows transmission of an optical signal in a television receiver according to Embodiment 1 of the present invention. The optical signal 120 is a digital signal or an analog signal modulated to transmit video information, and is mainly composed of red, blue, and green light rays. FIG. 2 shows an average spectrum of sunlight on the ground. The wavelengths of the blue, green, and red light rays constituting the optical signal are substantially the same as the wavelength 30 of the blue light ray, the wavelength 40 of the green light ray, and the wavelength 50 of the red light ray included in the sunlight.

  The optical signal 120 passes through a path 140 provided in a space 130 that is blocked from outside light. In order to prevent the optical video signal from being affected by external light, the optical video signal is often transmitted through a space blocked from external light.

  At this time, there are several percent of leaked light 110 that leaks out of the path 140. The leak light 110 is modulated in the same manner as the optical signal 120. A photoelectric conversion element 100 that converts an optical signal into an electrical signal is disposed at a position where the leaked light 110 is received.

  Here, as the path 140, for example, in a rear projection television, when an optical signal obtained by modulating light from a light source is projected onto a screen, a path through which the optical signal from the light source to the screen passes is used. Can be considered. Further, the present invention can be applied not only to a rear projection type television but also to all projection televisions including a front projection type television. As the photoelectric conversion element 100, a general photodiode or the like may be used.

  FIG. 3 shows an example of the optical signal 120. 3A shows the time change of the digital optical signal 10, and FIG. 3B shows the time change of the analog optical signal 20. FIG. The signal waveform of the leaked light 110 is the same as the signal waveform of the optical signal 120.

  FIG. 4 shows a circuit diagram of the auxiliary power supply device in the present embodiment. The equivalent circuit 200 is an equivalent circuit of the photoelectric conversion element 100. The output of the equivalent circuit 200 (that is, the output of the photoelectric conversion element 100) is input to the conversion circuit 300, and the output voltage of the conversion circuit 300 is applied to the electric load unit 400.

  The equivalent circuit 200 is expressed as a circuit in which a current source 200d and a diode 200c are connected in parallel, a parallel resistor 200b is connected in parallel, and a series resistor 200a is connected in series.

  The conversion circuit 300 includes a capacitor 300a connected in parallel to the first terminal unit 300c and a Zener diode 300b connected in parallel to the capacitor 300a. Note that a regulator IC or the like may be used instead of the Zener diode 300b.

  The second terminal unit 300d is connected to the electric load unit 400. Here, the electric load unit 400 is, for example, an electric load existing inside the television receiver.

<Operation>
Next, the operation of the auxiliary power supply device according to this embodiment will be described. First, the operation of the photoelectric conversion element 100 will be described. When the leaked light 110 enters the photoelectric conversion element 100, the photoelectric conversion element 100 having the output characteristics of FIG. 5 converts the leaked light 110 into an electrical signal. That is, since a current flows in the current source 200d of the equivalent circuit 200 according to the intensity of the input optical signal (that is, the leakage light 110), the optical signal waveform of the leakage light 110 is the same in the first terminal unit 300c. The voltage of the waveform is applied.

  FIG. 6 shows an output voltage (voltage applied to the first terminal portion 300 c) of the photoelectric conversion element 100 when the optical signal shown in FIG. 3 is input to the photoelectric conversion element 100. In FIG. 6A, a first voltage waveform 400a is a voltage applied to the first terminal unit 300c when the digital optical signal 10 is received. In FIG. 6B, a fourth voltage waveform 500a is a voltage applied to the first terminal unit 300c when the analog optical signal 20 is received.

  Next, the operation of the conversion circuit 300 will be described with reference to FIGS. When a modulated voltage signal is applied to the first terminal unit 300c, the capacitor 300a roughens and smoothes the waveform of the voltage signal.

  FIG. 6 shows the output voltage of the capacitor 300a. In FIG. 6A, a second voltage waveform 400b is an output voltage of the capacitor 300a when the first voltage waveform 400a (digital) is input. In FIG. 6B, a fifth voltage waveform 500b is an output voltage of the capacitor 300a when the fourth voltage waveform 500a (analog) is input. 6 that the electric signal output from the photoelectric conversion element 100 is roughly smoothed by the capacitor 300a.

  In response to the output of the capacitor 300a, the Zener diode 300b further smoothes the voltage signal. This voltage is output from the second terminal unit 300 d and applied to the electric load unit 400.

  In FIG. 6A, a third voltage waveform 400c is a voltage at the second terminal portion 300d when the second voltage waveform 400b is input to the Zener diode 300b. In FIG. 6B, a sixth voltage waveform 500c is a voltage at the second terminal portion 300d when the fifth voltage waveform 500b is input to the Zener diode 300b. Thus, it can be seen that the output voltage of the capacitor 300a is further smoothed by the Zener diode 300b.

  And the voltage of the 2nd terminal part 300d is applied to the electric load part 400, and it uses for a predetermined apparatus as an auxiliary power supply.

<Effect>
The auxiliary power supply apparatus according to the present embodiment is an auxiliary power supply apparatus disposed in a predetermined apparatus having a modulated optical signal path. Then, the photoelectric conversion element 100 that is disposed in the vicinity of the optical signal path 140 and receives the leaked light 110 leaked from the path 140 and converts it into an electric signal, and the electric signal output from the photoelectric conversion element 100 is converted into the electric load unit 400. And a conversion circuit 300 that converts the electric energy to be applied to the electric energy. Therefore, the optical signal that has lost energy as the leakage light 110 is converted into an electric signal by being received by the photoelectric conversion element 100, and further converted into electric energy for driving the electric load unit 400 using the conversion circuit 300. By doing so, it is possible to drive the electric load unit 400, which has the effect of reducing power consumption.

  In addition, the conversion circuit 300 included in the auxiliary power supply device of this embodiment includes a circuit that smoothes the voltage of an input electric signal. Therefore, since a constant voltage is applied to the electric load unit 400, the electric load unit 400 can be driven stably, and the operation reliability is improved.

  The conversion circuit 300 included in the auxiliary power supply device of this embodiment includes a capacitor 300a connected in parallel with the photoelectric conversion element 100, and a constant voltage element that receives the output voltage of the capacitor 300a and outputs a constant voltage. It is prepared for. Therefore, since the conversion circuit 300 is configured with a relatively simple circuit, the effects of downsizing and manufacturing cost reduction can be expected.

  The apparatus provided with the auxiliary power supply device of this embodiment is a television receiver, and the modulated optical signal is a video signal. Since the optical video signal propagated in the television receiver is usually modulated, the auxiliary power supply device of this embodiment is expected to be highly versatile in the television receiver.

<Embodiment 2>
In Embodiment 1, as long as electrical load unit 400 is operable with a roughly smoothed voltage, conversion circuit 300 may be configured only by capacitor 300a.

  FIG. 7 is a circuit diagram of an auxiliary power supply apparatus according to Embodiment 2 of the present invention. In FIG. 7, the conversion circuit 300 includes only a capacitor 300a connected in parallel to the first terminal unit 300c. Since other configurations are the same as those of the first embodiment, description thereof is omitted.

  In the present embodiment, the output of the capacitor 300 a is directly applied to the electric load unit 400. Therefore, the output of the conversion circuit 300 (that is, the voltage of the second terminal portion 300d) becomes the second voltage waveform 400b in FIG. 6A or the fifth voltage waveform 500b in FIG. 6B.

  According to the auxiliary power supply device of the present embodiment, the conversion circuit 300 includes only the capacitor 300 a connected in parallel with the photoelectric conversion element 100. Therefore, the effect of downsizing the auxiliary power supply device and reducing the manufacturing cost can be expected.

<Embodiment 3>
As another embodiment of the present invention, an embodiment without the conversion circuit 300 is shown in FIG. Since the configuration of this embodiment is the same as that of Embodiment 1 except that the conversion circuit 300 is not provided, the description thereof is omitted.

  In the present embodiment, the output voltage of the photoelectric conversion element 100 is directly applied to the electric load unit 400. Since the waveform of the output voltage of the photoelectric conversion element 100 is the same as the waveform of the modulated optical signal, the modulated voltage is applied to the electric load unit 400. That is, the voltage applied to the electric load unit 400 is the first voltage waveform 400a in FIG. 6A or the fourth voltage waveform 500a in FIG. 6B.

  Therefore, the electrical load unit 400 in the present embodiment is limited to an electrical load that can operate with a modulated voltage.

  The auxiliary power supply according to the present embodiment is characterized in that it does not include the conversion circuit 300 and directly applies the electric signal output from the photoelectric conversion element 100 to the electric load unit 400. Therefore, the size and the manufacturing cost can be reduced by the amount that the conversion circuit 300 is not provided.

  Although the television receiver has been described as the predetermined device in which the auxiliary power supply device of the present invention is disposed, the present invention can also be used in devices other than the above-described television receiver.

  It should be noted that the present invention can be freely combined with each other within the scope of the invention, and each embodiment can be appropriately modified or omitted.

  10 digital optical signal, 20 analog optical signal, 30 blue light wavelength, 40 green light wavelength, 50 red light wavelength, 100 photoelectric conversion element, 110 leakage light, 120 light signal, 130 blocked from outside light Space, 140 paths, 200 equivalent circuit, 200a series resistance, 200b parallel resistance, 200c diode, 200d current source, 300 conversion circuit, 300a capacitor, 300b zener diode, 300c first terminal portion, 300d second terminal portion, 400 electricity Load section, 400a first voltage waveform, 400b second voltage waveform, 400c third voltage waveform, 500a fourth voltage waveform, 500b fifth voltage waveform, 500c sixth voltage waveform.

Claims (6)

An auxiliary power supply device disposed in a predetermined device having a modulated optical signal path,
A photoelectric conversion element that is disposed in the vicinity of the path of the optical signal, receives a leaked light leaked from the path of the optical signal, and converts it into an electrical signal;
A conversion circuit that converts an electrical signal output from the photoelectric conversion element into electrical energy for application to a predetermined load;
An auxiliary power supply device. The conversion circuit includes:
A circuit for smoothing the voltage of an input electric signal is provided.
The auxiliary power supply device according to claim 1. The conversion circuit includes:
A capacitor connected in parallel with the photoelectric conversion element;
A constant voltage element that receives the output voltage of the capacitor and outputs a constant voltage;
An auxiliary power supply device according to claim 1. The conversion circuit includes:
The auxiliary power supply device according to claim 1, comprising only a capacitor connected in parallel with the photoelectric conversion element. Without the conversion circuit,
An electrical signal output from the photoelectric conversion element is directly applied to a predetermined load,
The auxiliary power supply device according to claim 1. The predetermined device is a television receiver;
The modulated optical signal is a video signal;
The auxiliary power supply device according to claim 1.

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