JPH11122123A - Radio receiver - Google Patents

Radio receiver

Info

Publication number
JPH11122123A
JPH11122123A JP27745797A JP27745797A JPH11122123A JP H11122123 A JPH11122123 A JP H11122123A JP 27745797 A JP27745797 A JP 27745797A JP 27745797 A JP27745797 A JP 27745797A JP H11122123 A JPH11122123 A JP H11122123A
Authority
JP
Japan
Prior art keywords
switching
frequency
power supply
reception
switching power
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP27745797A
Other languages
Japanese (ja)
Inventor
Takao Sato
孝雄 佐藤
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kokusai Electric Corp
Original Assignee
Kokusai Electric Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Kokusai Electric Corp filed Critical Kokusai Electric Corp
Priority to JP27745797A priority Critical patent/JPH11122123A/en
Publication of JPH11122123A publication Critical patent/JPH11122123A/en
Pending legal-status Critical Current

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  • Noise Elimination (AREA)

Abstract

PROBLEM TO BE SOLVED: To prevent switching noise of a switching power supply from giving disturbance onto reception sensitivity in the case the switching power supply is used for the radio receiver. SOLUTION: A switching power supply 2 is provided with a switching frequency oscillation circuit 5 that generates selectively at least two kinds of oscillating frequencies and the oscillated frequency is selected by a switching signal applied externally. A radio reception section 1 receiving a switching power supply is provided with a reception circuit 3 and a reception frequency. The reception frequency control circuit 4 outputs a switching frequency changeover signal to the switching frequency oscillation circuit 5 when a harmonic frequency of the switching noise of the switching power supply 2 has been matched with the reception frequency.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【0001】[0001]

【発明の属する技術分野】本発明は、スイッチング電源
を使用した無線受信機に関するものである。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radio receiver using a switching power supply.

【0002】[0002]

【従来の技術】複数の希望波を周波数を変えて受信する
オールバンド受信機能を有した無線受信機において、小
形,軽量化等のため電源部にスイッチング電源を使用し
た場合の、従来の無線受信機は、図2に示すように構成
されている。アンテナからの受信波を無線受信部21で
受信し、受信出力を復調器に出力する。無線受信部21
は、スイッチング電源22からのスイッチング電源を動
作電源とする。このスイッチング電源22を使用するこ
とによって小形,軽量化がはかられている。
2. Description of the Related Art In a radio receiver having an all-band reception function of receiving a plurality of desired waves at different frequencies, a conventional radio reception system is used in which a switching power supply is used for a power supply for miniaturization, weight reduction, and the like. The machine is configured as shown in FIG. The reception wave from the antenna is received by the radio reception unit 21, and the reception output is output to the demodulator. Wireless receiver 21
Uses the switching power supply from the switching power supply 22 as the operation power supply. By using the switching power supply 22, the size and weight can be reduced.

【0003】[0003]

【発明が解決しようとする課題】しかしながら、スイッ
チング電源22を使用することによって次のような問題
点が発生する。
However, the use of the switching power supply 22 causes the following problems.

【0004】即ち、スイッチング電源によるスイッチン
グノイズが無線受信機に妨害を与える。スイッチング電
源のスイッチングノイズは、その高調波が広帯域に分布
するため、オールバンド無線受信機の受信周波数と一致
する周波数が発生する。その結果、スイッチングノイズ
が無線受信機に妨害を与えてしまう。
[0004] That is, the switching noise caused by the switching power supply interferes with the radio receiver. The switching noise of the switching power supply generates a frequency that matches the reception frequency of the all-band wireless receiver because its harmonics are distributed over a wide band. As a result, the switching noise interferes with the wireless receiver.

【0005】ここで、無線受信機の感度は、0.5μV
程度の入力電圧でも十分受信する能力を有している。一
方、スイッチング電源のスイッチング回路のスイッチン
グ電圧は、一般的に数十Vと高いから、このスイッチン
グ回路から発生するスイッチングノイズの電圧も高く、
電源部にノイズフィルタ等を入れても50mV程度まで
しか低減できない。
Here, the sensitivity of the radio receiver is 0.5 μV
It has the ability to receive enough input voltage. On the other hand, since the switching voltage of the switching circuit of the switching power supply is generally as high as several tens of volts, the voltage of the switching noise generated from this switching circuit is also high,
Even if a noise filter or the like is provided in the power supply unit, it can be reduced only to about 50 mV.

【0006】したがって、スイッチングノイズの電圧を
受信感度以下にする必要があり、従来は、そのスイッチ
ングノイズの低減対策として、ノイズフィルタの挿入、
シールドの強化、一点アースの採用等を行なって、受信
部へのスイッチングノイズの廻り込みを防ぐようにして
いる。しかし、これらの対策を行なってもスイッチング
ノイズの電圧を受信感度以下にすることが困難なため、
受信部への干渉を皆無にすることはできなかった。
Therefore, the voltage of the switching noise must be lower than the receiving sensitivity. Conventionally, as a measure for reducing the switching noise, a noise filter is inserted,
By strengthening the shield, adopting a single point ground, etc., it is possible to prevent switching noise from entering the receiver. However, even if these measures are taken, it is difficult to reduce the switching noise voltage below the receiving sensitivity.
The interference to the receiver could not be completely eliminated.

【0007】本発明の目的は、前記スイッチング電源の
スイッチングノイズが受信感度に及ぼす障害を解決し、
無線受信機内部で発生する電磁波の影響を受けることの
ない無線受信機の提供にある。
An object of the present invention is to solve the problem that the switching noise of the switching power supply affects the receiving sensitivity.
An object of the present invention is to provide a wireless receiver that is not affected by electromagnetic waves generated inside the wireless receiver.

【0008】[0008]

【課題を解決するための手段】前記の目的は、スイッチ
ング周波数を外部からの切替信号によって少なくとも2
種類の周波数に切替可能としたスイッチング電源を備え
たことによって達成される。
The object of the present invention is to set the switching frequency to at least two by an external switching signal.
This is achieved by providing a switching power supply capable of switching to different frequencies.

【0009】また、前記の目的は、前記スイッチング電
源を備えると共に、無線受信部にスイッチング電源のス
イッチングノイズの高調波周波数が受信周波数に一致し
た場合に前記スイッチング電源のスイッチング周波数を
他に切替える切替信号を発生する受信周波数制御回路を
設けたことによって達成される。
Further, the above object is to provide a switching signal which comprises the switching power supply, and switches a switching frequency of the switching power supply to another when a harmonic frequency of switching noise of the switching power supply coincides with a reception frequency in a radio receiving unit. This is achieved by providing a reception frequency control circuit that generates

【0010】前記の手段によれば、スイッチング電源の
スイッチング周波数を少なくとも2種類の周波数に切替
可能としたことによって、スイッチング電源のスイッチ
ングノイズが受信感度へ妨害を与える場合は、自動的あ
るいは手動でスイッチング電源のスイッチング周波数を
切替える。このスイッチング周波数を切替えることによ
って、スイッチングノイズの高調波周波数が受信周波数
に一致しなくなり、したがってスイッチングノイズが受
信感度へ妨害を与えなくなる。
According to the above-mentioned means, the switching frequency of the switching power supply can be switched to at least two kinds of frequencies. Therefore, when the switching noise of the switching power supply interferes with the receiving sensitivity, the switching is automatically or manually performed. Switch the switching frequency of the power supply. By switching the switching frequency, the harmonic frequency of the switching noise does not match the reception frequency, and thus the switching noise does not interfere with the reception sensitivity.

【0011】無線受信部に設けた受信周波数制御回路
は、スイッチングノイズの高調波周波数が受信周波数と
一致することを常に監視しており、それが一致するとス
イッチング周波数の切替信号を出力するので、これによ
りスイッチング周波数を常に受信周波数に影響ないもの
とすることができる。
The reception frequency control circuit provided in the radio reception unit constantly monitors that the harmonic frequency of the switching noise matches the reception frequency, and outputs a switching signal of the switching frequency when the harmonic frequency matches the reception frequency. Thereby, the switching frequency can always be set so as not to affect the reception frequency.

【0012】[0012]

【発明の実施の形態】以下、本発明の実施の形態を図面
により説明する。
Embodiments of the present invention will be described below with reference to the drawings.

【0013】図1は、本発明の一実施形態を示す。本発
明の無線受信機は、スイッチング電源2内にスイッチン
グ周波数発振回路5を設け、スイッチング周波数発振回
路5の発振周波数を少なくとも2種類(f1,f2)発生
させることができるようにしてあり、外部から加えられ
る切替信号によって発振周波数が切替られる。スイッチ
ング電源2はAC100Vが入力され、AC−DCイン
バータにより変換された直流電圧をスイッチング周波数
発振回路5の発振周波数でスイッチングしたスイッチン
グ電源を無線受信部1に出力する。一方無線受信部1に
おいては、受信回路3によりアンテナからの電波を受信
し受信出力を復調器へ出力する。また受信周波数を制御
する受信周波数制御回路4が設けてあり、この回路4か
らスイッチング周波数切替信号を出力する。図示するよ
うにスイッチング電源2を自動で制御する場合は、スイ
ッチング周波数切替信号をスイッチング電源のスイッチ
ング周波数発振回路5に入力して発振周波数の切替制御
を行なう。
FIG. 1 shows an embodiment of the present invention. In the wireless receiver of the present invention, a switching frequency oscillation circuit 5 is provided in the switching power supply 2 so that at least two types of oscillation frequencies (f 1 and f 2 ) of the switching frequency oscillation circuit 5 can be generated. The oscillation frequency is switched by a switching signal applied from the outside. The switching power supply 2 is supplied with AC 100 V, and outputs to the wireless reception unit 1 a switching power supply obtained by switching the DC voltage converted by the AC-DC inverter at the oscillation frequency of the switching frequency oscillation circuit 5. On the other hand, in the wireless receiving section 1, the receiving circuit 3 receives a radio wave from an antenna and outputs a reception output to the demodulator. A reception frequency control circuit 4 for controlling the reception frequency is provided, and this circuit 4 outputs a switching frequency switching signal. As shown in the figure, when controlling the switching power supply 2 automatically, a switching frequency switching signal is input to the switching frequency oscillation circuit 5 of the switching power supply to control the switching of the oscillation frequency.

【0014】受信周波数制御回路4は、スイッチング電
源2のスイッチングノイズの高調波周波数が受信周波数
に一致した場合、スイッチング周波数切替信号を出力す
る。そのスイッチングノイズの高調波周波数と受信周波
数の一致の判定は、各スイッチング周波数関係から妨害
を受ける受信周波数がわかるので、これをソフトウェア
プログラム内のテーブルに入力し、妨害を受ける受信周
波数を参照できるようにしておくことによって実現で
き、受信周波数を監視して一致を判定したときスイッチ
ング周波数切替信号を出力する。
When the harmonic frequency of the switching noise of the switching power supply 2 matches the reception frequency, the reception frequency control circuit 4 outputs a switching frequency switching signal. In order to determine the coincidence between the harmonic frequency of the switching noise and the reception frequency, the reception frequency to be disturbed can be known from each switching frequency relationship. Therefore, this can be input to a table in the software program so that the reception frequency to be disturbed can be referred to. The switching frequency switching signal is output when the reception frequency is monitored and a match is determined.

【0015】例えば、今スイッチング電源2内のスイッ
チング周波数発振回路5は、通常周波数f1で発振して
いるものとする。そこでスイッチング電源2のスイッチ
ングノイズが受信感度へ妨害を与える場合は、この時の
受信周波数をfxとすれば、fxの値を予じめ受信周波
数制御回路4のソフトウェアプログラム内のテーブルに
入れておけば、受信周波数としてfxを指定すると、受
信周波数制御回路4からはスイッチング周波数切替信号
を出力し、スイッチング電源2内のスイッチング周波数
発振回路5の周波数をf1から他のf2へ切替える。
[0015] For example, now the switching frequency oscillating circuit 5 in the switching power supply 2 is assumed to be oscillating in the normal frequency f 1. If the switching noise of the switching power supply 2 interferes with the reception sensitivity, the reception frequency at this time is assumed to be fx, and the value of fx can be stored in advance in a table in the software program of the reception frequency control circuit 4. , specifying the fx as the reception frequency, and outputs a switching frequency switching signal from the receiving frequency control circuit 4 switches the frequency of the switching frequency oscillating circuit 5 in the switching power supply 2 from f 1 to the other f 2.

【0016】スイッチング電源2のスイッチング周波数
が切替えられたことによって、このスイッチングノイズ
の高調波の周波数は受信周波数fxと一致しなくなる。
このため、無線受信部1の受信感度に妨害を与えること
がなくなる。スイッチング周波数は通常数百KHzであ
るが、周波数切替(シフト量)は、例えば5〜10KH
z程度とする。
Since the switching frequency of the switching power supply 2 is switched, the harmonic frequency of the switching noise does not match the reception frequency fx.
For this reason, the reception sensitivity of the wireless receiver 1 is not hindered. The switching frequency is usually several hundred KHz, but the frequency switching (shift amount) is, for example, 5 to 10 KH.
about z.

【0017】なお、スイッチング電源のスイッチング周
波数切替信号によるスイッチング周波数の切替は、自動
制御に限らず手動で切替えるスイッチを設けてもよい。
その場合、無線受信機の受信感度に妨害を与えているこ
とを何等かの手段で検出し、妨害を与えている時はスイ
ッチング周波数切替スイッチをONとすることにより妨
害を与えないようにできる。
The switching of the switching frequency by the switching frequency switching signal of the switching power supply is not limited to automatic control, and a switch for manual switching may be provided.
In that case, it is possible to detect by some means that the reception sensitivity of the wireless receiver is being hindered, and to turn off the switching frequency changeover switch when the hindrance is being hindered.

【0018】[0018]

【発明の効果】以上のように本発明によれば、無線受信
機にスイッチング電源を使用した場合、従来のように過
度のシールド等の対策を行なわなくても、スイッチング
ノイズが受信感度へ妨害を与えるのを容易に防ぐことが
できる効果がある。
As described above, according to the present invention, when a switching power supply is used in a radio receiver, switching noise interferes with the reception sensitivity without taking measures such as excessive shielding as in the related art. There is an effect that can be easily prevented from being given.

【図面の簡単な説明】[Brief description of the drawings]

【図1】本発明の一実施形態の回路構成図。FIG. 1 is a circuit configuration diagram of an embodiment of the present invention.

【図2】従来の無線受信機の構成図。FIG. 2 is a configuration diagram of a conventional wireless receiver.

【符号の説明】[Explanation of symbols]

1…無線受信部、2…スイッチング電源、3…受信回
路、4…受信周波数制御回路、5…スイッチング周波数
発振回路。
DESCRIPTION OF SYMBOLS 1 ... Wireless receiving part, 2 ... Switching power supply, 3 ... Receiving circuit, 4 ... Receiving frequency control circuit, 5 ... Switching frequency oscillation circuit.

Claims (2)

【特許請求の範囲】[Claims] 【請求項1】 スイッチング電源を使用したオールバン
ド無線受信機において、スイッチング周波数を外部から
の切替信号によって少なくとも2種類の周波数に切替可
能としたスイッチング電源を備えたことを特徴とする無
線受信機。
1. An all-band wireless receiver using a switching power supply, comprising: a switching power supply capable of switching a switching frequency to at least two kinds of frequencies by an external switching signal.
【請求項2】 スイッチング電源を使用したオールバン
ド無線受信機において、スイッチング周波数を外部から
の切替信号によって少なくとも2種類の周波数に切替可
能としたスイッチング電源を備え、無線受信部に前記ス
イッチング電源のスイッチングノイズの高調波周波数が
受信周波数に一致した場合に前記スイッチング電源のス
イッチング周波数を他に切替える切替信号を発生する受
信周波数制御回路を設けたことを特徴とする無線受信
機。
2. An all-band wireless receiver using a switching power supply, comprising: a switching power supply capable of switching a switching frequency to at least two kinds of frequencies by a switching signal from the outside; A wireless receiver, comprising: a reception frequency control circuit that generates a switching signal that switches a switching frequency of the switching power supply to another when a harmonic frequency of noise matches a reception frequency.
JP27745797A 1997-10-09 1997-10-09 Radio receiver Pending JPH11122123A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP27745797A JPH11122123A (en) 1997-10-09 1997-10-09 Radio receiver

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP27745797A JPH11122123A (en) 1997-10-09 1997-10-09 Radio receiver

Publications (1)

Publication Number Publication Date
JPH11122123A true JPH11122123A (en) 1999-04-30

Family

ID=17583862

Family Applications (1)

Application Number Title Priority Date Filing Date
JP27745797A Pending JPH11122123A (en) 1997-10-09 1997-10-09 Radio receiver

Country Status (1)

Country Link
JP (1) JPH11122123A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1501220A1 (en) * 2003-07-22 2005-01-26 Orion Electric Company, Ltd. Electric apparatus eliminating interference from power supply
US7003270B2 (en) 2001-10-29 2006-02-21 Fujitsu Limited Electronic apparatus having radio transmitter
JP2006140792A (en) * 2004-11-12 2006-06-01 Pioneer Electronic Corp Switching frequency controller and program for switching frequency control
KR100879483B1 (en) * 2001-08-08 2009-01-20 쉘 인터내셔날 리써취 마트샤피지 비.브이. Process to prepare a hydrocarbon product having a sulphur content of below 0.05 wt%

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100879483B1 (en) * 2001-08-08 2009-01-20 쉘 인터내셔날 리써취 마트샤피지 비.브이. Process to prepare a hydrocarbon product having a sulphur content of below 0.05 wt%
US7003270B2 (en) 2001-10-29 2006-02-21 Fujitsu Limited Electronic apparatus having radio transmitter
EP1501220A1 (en) * 2003-07-22 2005-01-26 Orion Electric Company, Ltd. Electric apparatus eliminating interference from power supply
JP2005045549A (en) * 2003-07-22 2005-02-17 Orion Denki Kk Electric apparatus with receiver
JP2006140792A (en) * 2004-11-12 2006-06-01 Pioneer Electronic Corp Switching frequency controller and program for switching frequency control

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