JPH06311057A - Radio power transmitter - Google Patents

Abstract

PURPOSE:To utilize power effectively by sending harmonics together with a fundamental wave and sending information simultaneously. CONSTITUTION:A final stage power amplifier circuit 12 amplifies power of a transmission signal Sa to be a predetermined power Sb, and an LPF 14 passes a power Sc of a fundamental wave f0 only. Moreover, only the power Sc of the fundamental wave f0 from the LPF 14 is extracted by a BPF 15 and the transmitted power Sd is emitted as a radio wave Wa via an output terminal Tb and an antenna ANT 16. The power of a double frequency 2f0 in the power Sb from the final stage power amplifier circuit 12 is reflected in the LPf 14 and the power of the double frequency 2f0 is fed to an LPF 18, from which the power Se is transmitted, a power Sf extracted and passed by the BPF 19 is emitted as a radio wave Wb through an output terminal Tc and an antenna ANT 20.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wireless power transmitter for simultaneously transmitting power of a fundamental wave and a harmonic wave.

[0002]

2. Description of the Related Art Conventionally, when wirelessly transmitting by modulating with a data signal, an audio signal, a video signal, etc., transmission is performed from a transmitting device at one frequency corresponding to the reception frequency of a receiver on the receiving side. In addition, simultaneous transmission may be performed at a plurality of frequencies in consideration of radio wave propagation corresponding to the reflection status of the ionosphere at daytime and nighttime, such as shortwave broadcasting. Such a wireless transmission device has an oscillation signal processing system, a modulation signal processing system, a power transmission system, etc., and radio waves are transmitted through an antenna connected to the power transmission system.

FIG. 2 is a block diagram showing a schematic configuration of a conventional wireless power transmitter. In FIG. 2, this device includes a final stage power amplifier circuit 2 that amplifies a transmission signal Sa input through an input terminal Ta to a predetermined power, and a circulator 3 that passes the power amplified by the final stage power amplifier circuit 2. And a low-pass filter (LPF) 4 that passes the low frequency band of the electric power from the circulator 3. Further, in this device, a bandpass filter (BPF) 5 that passes only the frequency band of the power output from the LPF 4, and the power from this BPF 5 is output to the output terminal T.
The antenna (ANT) 6 which is supplied through b and radiates as the radio wave W, and the power of the double frequency which is the unwanted wave reflected by the LPF 4 is supplied through the reflection terminal of the circulator 3, and the shielded terminating resistor (pseudo) is used. Load) 7
And are provided.

Next, the operation of this conventional structure will be described. The transmission signal Sa is amplified by the final stage power amplifier circuit 2 to a predetermined power and then sent out. Then, it is radiated from the ANT 6 through the circulator 3, LPF 4, and BPF 5. In this case, the high-frequency transmission signal Sa includes the harmonic component signal in the frequency spectrum, that is,
Contains spurs. The power of the double frequency in the harmonic component signal is at a lower level than the transmission signal Sa of the fundamental wave, but it is at a relatively high level, so it is reflected by the LPF 4 and passed through the reflection terminal of the circulator 3 to terminate the resistor 7.
Is supplied to and absorbed.

As described above, in the conventional wireless power transmitter, the shielded terminating resistor 7 absorbs the component signal of the relatively high level of the doubled frequency to prevent the leakage of spurious waves to the outside. It is blocking. This prevents the transmitter and the receiver near the ANT 6 from being unable to receive due to spurious (unwanted waves).

As proposals relating to this type of wireless power transmission apparatus, "solar power transfer apparatus" disclosed in Japanese Patent Laid-Open No. 58-103839 and "movement" disclosed in Japanese Patent Laid-Open No. 63-70621. The information exchange device with the body "and the" wireless receiving device "disclosed in Japanese Patent Laid-Open No. 3-7033 can be mentioned.

[0007]

In the above-mentioned conventional wireless power transmitter, the power of the doubled frequency of a relatively high level is processed as an unnecessary wave and is only converted into heat by the terminating resistor 7. . Therefore, there is room for improvement in consideration of effective use of electric power.

Further, Japanese Patent Laid-Open No. 58-103839
In Japanese Unexamined Patent Publication No. 63-70621 and Japanese Unexamined Patent Publication No. 3-7033, there is no structure for effectively utilizing electric power of a relatively high level double frequency.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a wireless power transmission apparatus capable of transmitting a fundamental wave and a harmonic wave to effectively use electric power.

[0010]

In order to achieve the above-mentioned object, a wireless power transmitter of the present invention has a fundamental wave power passing means for passing fundamental wave power, and radiates electric power from the fundamental wave power passing means. A first antenna and harmonic power extraction means for extracting harmonic power included in the power of the fundamental wave;
The second antenna for radiating the harmonic power from the harmonic power extraction means as a radio wave.

In this configuration, the fundamental wave power passing means includes a first low-pass filter that allows the power of the fundamental wave to pass therethrough and reflects harmonic power, and a fundamental wave that has passed through the first low-pass filter. A first bandpass filter for extracting only electric power and radiating it from the first antenna, a second lowpass filter for passing harmonic power reflected by the first lowpass filter, and a second lowpass filter are provided. A second bandpass filter for extracting only the electric power of the passed harmonics and radiating it from the second antenna.

In these configurations, the frequency of the harmonic power is set to be twice the fundamental frequency.

[0013]

The wireless power transmitter of the present invention having the above-mentioned structure radiates the fundamental wave power from the antenna, and
The harmonic power contained in the power of the fundamental wave is extracted and radiated from the antenna at the same time. Therefore, for example, it is possible to simultaneously perform information transmission from two antennas to two desired service areas having different beam directions, and it is possible to effectively use electric power.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of a wireless power transmitter of the present invention will be described with reference to the drawings. 1 is a block diagram showing the configuration of an embodiment of a wireless power transmitter of the present invention. In FIG. 1, this device has a fundamental wave transmission system A and a double frequency wave transmission system B that transmits harmonics.
The fundamental wave transmission system A transmits the transmission signal Sa through the input terminal Ta.
Power amplifier circuit 1 that is supplied with and amplifies to a predetermined power
Have two.

Further, the fundamental wave transmission system A is supplied with the fundamental wave f0 amplified by the final stage power amplifier circuit 12 and the power Sb containing the doubled frequency 2f0, and the cutoff frequency is doubled with the fundamental wave f0. The center frequency of the frequency 2f0, that is, the low-pass filter (LP
F) 14 and a bandpass filter (BPF) that extracts and passes only the power Sc of the fundamental wave f0 from the LPF 14.
15 and the electric power Sd from this BPF 15 is output terminal Tb
And an antenna (ANT) 16 which is supplied through the antenna and radiates as a radio wave Wa.

Next, the double frequency wave transmission system B includes the fundamental wave f 0 amplified by the final stage power amplifier circuit 12 and the double frequency 2
The power Sb including f0 is supplied and the cutoff frequency is 2
The LPF 18 has a low-frequency power Se at a double frequency 2f0, that is, a double frequency 2f0 that is a harmonic of the fundamental wave f0. Further, in the double frequency wave transmission system B, a BPF 19 for extracting and passing only the electric power Se of the double frequency 2f0 from the LPF 18, and this BP
The power Sf from F19 is supplied through the output terminal Tc, and the ANT 20 that radiates as the radio wave Wb is provided.

Next, the operation of the configuration of this embodiment will be described. In the fundamental wave transmission system A, first, the transmission signal S
The power a is amplified by the final stage power amplifier circuit 12 to a predetermined power Sb and sent out. Then, the power Sc of only the fundamental wave f0 is passed through the LPF 14 whose cutoff frequency is the center frequency of the fundamental wave f0 and the double frequency 2f0. Furthermore, L
Only the electric power Sc of the fundamental wave f0 from the PF14 is transmitted to the BPF15.
The electric power Sd that has been extracted and passed in step S2 is radiated as a radio wave Wa from the ANT 16 connected to the output terminal Tb.

Further, in the double frequency wave transmission system B, the power of the double frequency 2f 0 in the power Sb from the final stage power amplifier circuit 12 is reflected by the LPF 14. This double frequency 2f0
Is supplied to the LPF 18, and the low frequency power Se passes through the LPF 18. Further, the electric power Sf obtained by extracting only the electric power Se of the double frequency 2f0 from the LPF 18 by the BPF 19 and passing it is connected to the output terminal Tc A.
It is radiated as a radio wave Wb from NT20.

Thus, the fundamental wave f0 and the doubled frequency 2
f0 is transmitted from the ANTs 16 and 20, respectively, by the radio waves Wa and W
It is simultaneously transmitted as b. In this case, double the frequency 2
The electric power Sf of f0 is lower than the electric power Sd of the fundamental wave f0, for example, about 1/10, but compared with the case where it is conventionally absorbed as an unnecessary wave by a terminating resistor or the like, 2 Data, audio signals, video signals and the like can be transmitted through the radio wave Wb having the double frequency 2f0. Simultaneous transmission of the fundamental wave f0 and the doubled frequency 2f0 is performed by the ANT.
The signals are transmitted so that the beam directions of 16 and 20 are different. That is, the information can be transmitted to two desired service areas at the same time, and the electric power can be effectively used.

In this embodiment, the fundamental wave f0 and the electric powers Sd and Sf of the double frequency 2f0 are transmitted, but electric power of the frequency nf0 which is three times or more may be transmitted.
In this case, the cutoff frequencies of the LPFs 14, 18 and the BPFs 15, 19 are made to correspond to the frequency nf0, respectively. Further, in this embodiment, the configuration has been described in which the two waves of the radio waves Wa and Wb are radiated using the two ANTs 16 and 20, but the configuration of the antenna device is simplified by using one dual-wave antenna device. You can also do it.

[0021]

As described above, the wireless power transmitter of the present invention radiates the power of the fundamental wave from the antenna,
Moreover, since the harmonic power contained in the power of the fundamental wave is extracted and the radio waves are simultaneously radiated from the antennas, for example, information can be simultaneously transmitted from each antenna to two desired service areas having different beam directions. As a result, it is possible to effectively use electric power.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of an embodiment of a wireless power transmitter of the present invention.

FIG. 2 is a block diagram showing a configuration of a conventional wireless power transmitter.

[Explanation of symbols]

 12 final stage power amplifier circuit 14,18 LPF 15,19 BPF 16,20 ANT

Claims (3)

[Claims] 1. A fundamental wave power passing means for passing a fundamental wave power, and a radio wave radiating power from the fundamental wave power passing means.
And a second antenna for radiating the harmonic power from the harmonic power extraction means as a radio wave, and a second antenna for radiating the harmonic power from the harmonic power extraction means. Transmitter. 2. The fundamental wave power passing means transmits only the power of the fundamental wave which passes the power of the fundamental wave and reflects the harmonic power, and the power of the fundamental wave which has passed through the first low pass filter. A first bandpass filter for extracting and radiating from a first antenna, a second lowpass filter for passing the harmonic power reflected by the first lowpass filter, and a second lowpass filter 2. A wireless power transmitting apparatus according to claim 1, further comprising: a second bandpass filter for extracting only the power of the harmonic wave and radiating it from the second antenna. 3. The harmonic power frequency is 2 times the fundamental frequency.
The wireless power transmission device according to claim 1, wherein the wireless power transmission device has a doubled frequency.