JPH04365226A - Transmitter and transmitter/receiver - Google Patents

Abstract

PURPOSE:To reduce energy consumption when a high frequency output is small or in the case of reception or the like by controlling the switching frequency of a voltage converting and supplying means based on the output level of a high frequency power amplifying means. CONSTITUTION:A DC power source 11 to supply power to the respective parts of the transmitter, a high frequency power amplifying means 10 to amplify a high frequency signal modulating information to be transmitted, a voltage converting/supplying means 12 to convert the voltage of the DC power source 11 into a high voltage by switching and to supply it, and an output control signal generation part 13 to control the switching frequency of the voltage converting/supplying means 12 based on the output level of the high frequency power amplifying means 10 are provided. When the output level of the high frequency power amplifying means 10 is high, the switching of the voltage converting/supplying means 12 is controlled at a high frequency by the output control signal generation part 13 and when the output level is low, it is controlled at a low frequency. Thus, when the output level is low, energy consumption can be reduced.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transmitting device and a transmitting/receiving device, such as a mobile phone, which uses a battery as a power source and further includes a high frequency power amplification section.

0002

BACKGROUND OF THE INVENTION Batteries are used as a power source in wireless devices such as mobile phones. Such wireless devices require a relatively high voltage in the high frequency power amplification section of the transmitting section. However, combining many batteries to generate high voltage increases the size and impairs portability. For this reason, a DC-DC converter is used to convert low voltage direct current to high voltage direct current. This DC-DC converter switches input direct current at high frequency to obtain high voltage direct current. DC-D
C converters have relatively high efficiency, but internal losses increase when switching at high frequencies. In conventional wireless devices such as mobile phones, the switching frequency is determined based on the case where the high frequency power amplification section reaches maximum power.

[0003] For this reason, when the power of the high-frequency power amplifying section may be small, or when in standby mode, the loss within the DC-DC converter that reduces power consumption is large.
This was an obstacle to reducing power consumption.

0004

[Problems to be Solved by the Invention] As mentioned above, in conventional wireless devices, when the high frequency output is small or during reception, the power consumed inside the DC-DC converter becomes large compared to the total power consumption. , which was an impediment to lower power consumption.

[0005] The present invention was devised to solve such problems, and its purpose is to provide a transmitting device and a transmitting/receiving device that achieve low power consumption when high frequency output is small or during reception. do.

[0006]

[Means for Solving the Problems] In order to achieve the above-mentioned object, a first invention is a transmitting device that modulates information to be transmitted and radiates radio waves, the transmitting device having power supply to each part of the transmitting device. a DC power source to supply, and high frequency power amplification means for power amplifying the high frequency signal in which the information to be transmitted is modulated;
voltage conversion/supply means for converting the voltage of the DC power source into a higher voltage DC by switching and supplying it to the high frequency power amplification means; A second invention is a transmitting device comprising a switching frequency control means for controlling a switching frequency, and a second invention is a transmission device according to the first invention, wherein when the output level of the high frequency power amplification means is large, A third aspect of the present invention is a transmitting device that controls switching of the voltage conversion/supply means at a high frequency and at a low frequency when the output level of the high-frequency power amplification means is small, A transmitting/receiving device that performs the following: a DC power source that supplies power to each part of the transmitting/receiving device, a high frequency power amplification means that amplifies the power of a high frequency signal in which information to be transmitted is modulated, and a voltage of the DC power source that is controlled by switching. Voltage conversion/supply means converts the DC voltage into higher voltage DC and supplies it to the high frequency power amplification means, and a reception/supply means receives and demodulates the transmission output level request signal sent from the base station.
demodulation means, and control means for controlling the output level of the high frequency power amplification means based on the transmission output level request signal received and demodulated by the reception and demodulation means, and the switching frequency of the voltage conversion and supply means. A fourth invention is a transmitting/receiving device comprising: in the third invention, the control means controls the output of the high frequency power amplifying means at a high frequency when the output level of the high frequency power amplifying means is high; The transmitting/receiving device controls switching of the voltage converting/supplying means at a low frequency when the level is low.

[0007]

In the transmitter and transmitter/receiver of the present invention, the switching frequency of the voltage converting/supplying means is controlled based on the output level of the high frequency power amplifying means for transmitting.

[0008] Therefore, it is possible to reduce power consumption when the output level of the high frequency power amplifying means is low.

[0009]

Embodiments Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of an embodiment in which the present invention is applied to a portable radio telephone device.

As shown in the figure, the portable radio telephone device of this embodiment includes an antenna 1, a duplexer 2 for using the same antenna for transmission and reception, and an antenna 1 led from the duplexer 2. A reception high frequency section 3 converts the frequency of the high frequency signal induced by the signal and amplifies it to a predetermined level, a demodulation section 4 demodulates the high frequency signal frequency-converted and amplified by the reception high frequency section 3, and a signal demodulated by the demodulation section 4. a low-frequency wave section 7 that amplifies and outputs it from the speaker 5 and also amplifies the audio signal input from the microphone 6; a modulation section 8 that modulates a carrier wave with the signal from the microphone 6 amplified by the low-frequency section 7; A transmission high frequency section 9 that multiplies and frequency converts the high frequency signal modulated by the modulation section 8; a transmission power amplifier 10 that amplifies the power of the output signal from the transmission high frequency section 9 and supplies it to the duplexer 2; and a plurality of batteries 11. a DC-DC converter 12 that converts the voltage of the base station to generate a high voltage, and an output control signal generator that generates a signal for controlling the transmission output from the transmission output request signal from the base station demodulated by the demodulation unit 4. 13, and a transmission output control section 14 that changes the amplification degree of the transmission power amplification section based on the signal generated by the output control signal generation section 13.

Next, the operation of the portable radio telephone device having the above-described structure will be explained.

First, a high frequency signal is induced in the antenna 1 by radio waves transmitted from a base station (not shown), etc.
The signal passes through the duplexer 2 and is guided to the reception high frequency section 3. The reception high frequency section 3 amplifies and frequency converts the high frequency signal from the duplexer 2. The demodulator 4 demodulates the high frequency signal output from the reception high frequency section 3, and the low frequency section 7 amplifies the output from the demodulation section 4 to a low frequency and outputs it from the speaker 5.

On the other hand, the user's voice is collected by a microphone 6, amplified by a low frequency section 7, and modulated into a carrier wave by a modulation section 8. This modulated high frequency signal is subjected to frequency conversion, multiplication, and excitation amplification in the transmission high frequency section 9. Then, the power of the output of the transmission high frequency section 9 is amplified in the transmission power amplification section 10, and the amplified power is supplied to the antenna 1 via the duplexer 2, and is radiated from the antenna 1 as a radio wave.

The battery 11 is supplied to each part of the apparatus except the transmission power amplifying section 10, and is also supplied to the DC-DC converter 12. The DC-DC converter 12 generates a high voltage by switching the voltage of the battery 11, and supplies the high voltage to the transmission power amplification section 10.

Furthermore, the radio waves transmitted from the base station include a transmission power request signal, which is demodulated by the demodulator 4 and transferred to the output control signal generator 13. The output control signal generating section 13 generates a transmission output signal based on the sent transmission power request signal, and transfers it to the transmission output control section 14. The transmission output control section 14 changes the power amplification factor of the transmission power amplification section 10 based on this transmission output signal. Further, the output control signal output from the output control signal generation section 13 is transferred to the DC-DC converter 12, and the switching frequency of the DC-DC converter 12 is high when a large transmission power is required, and high when a low transmission power is required. control is made so that it is low when

Therefore, in the portable radio telephone device of this embodiment, when the transmission power is small, the switching frequency of the DC-DC converter 12 becomes small, so that the DC-DC
Loss inside converter 12 is reduced.

Furthermore, although the portable radio telephone device of this embodiment is configured so that a transmission output request signal is sent from the base station, it is also possible to vary the transmission output from an operation panel or the like. In this case, the output control signal generation section 13 may transfer the output control signal to the transmission output control section 14 based on a signal from an operation panel or the like.

[0019]

According to the transmitting device and the transmitting/receiving device of the present invention, the switching frequency of the voltage conversion/supply means is controlled based on the output level of the high frequency power amplifying means for transmission, so that the output of the high frequency power amplifying means is controlled. It becomes possible to reduce power consumption when the level is low.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the configuration of a portable radio telephone device according to an embodiment of the present invention.

[Explanation of symbols]

1...Antenna 2...Shared device 3...Receiving high frequency section 4...Demodulator 5...Speaker 6...Mike 7...Low frequency section 8...Modulation section 9...Transmission high frequency section 10...Transmission power amplification section 11...Battery 12...DC-DC converter 13...Output control signal generation section 14...Transmission output control section

Claims (4)

[Claims] 1. A transmitting device that modulates information to be transmitted and radiates radio waves, the transmitting device comprising: a DC power source that supplies power to each part of the transmitting device; and a high-frequency signal in which the information to be transmitted is modulated. a high-frequency power amplification means for amplifying; and a voltage converter that converts the voltage of the DC power source into a higher voltage DC by switching and supplies the high-frequency power amplification means to the high-frequency power amplification means.
A transmitting device comprising a supply means and a switching frequency control means for controlling a switching frequency of the voltage conversion/supply means based on the output level of the high frequency power amplification means. 2. The switching frequency control means operates at a high frequency when the output level of the high frequency power amplification means is high, and at a low frequency when the output level of the high frequency power amplification means is low. 2. The transmitting device according to claim 1, wherein the transmitting device controls switching of the supply means. 3. A transmitting/receiving device that communicates information using radio waves, comprising: a DC power supply that supplies power to each part of the transmitting/receiving device; and a high-frequency power source that amplifies the power of a high-frequency signal modulated with information to be transmitted. an amplifying means, a voltage converting/supplying means that converts the voltage of the DC power supply into a higher voltage DC by switching and supplies it to the high frequency power amplifying means, and receives a transmission output level request signal sent from a base station. - A receiving/demodulating means for demodulating, and controlling the output level of the high frequency power amplifying means based on the transmission output level request signal received/demodulated by the receiving/demodulating means, and controlling the switching frequency of the voltage converting/supplying means. A transmitting/receiving device comprising a control means for controlling. 4. The control means operates at a high frequency when the output level of the high frequency power amplification means is high, and at a low frequency when the output level of the high frequency power amplification means is low. 4. The transmitting/receiving device according to claim 3, wherein the transmitting/receiving device controls switching of the transmitting/receiving device.