JP2001308664A - Auto power control circuit - Google Patents
Auto power control circuitInfo
- Publication number
- JP2001308664A JP2001308664A JP2000120225A JP2000120225A JP2001308664A JP 2001308664 A JP2001308664 A JP 2001308664A JP 2000120225 A JP2000120225 A JP 2000120225A JP 2000120225 A JP2000120225 A JP 2000120225A JP 2001308664 A JP2001308664 A JP 2001308664A
- Authority
- JP
- Japan
- Prior art keywords
- voltage
- power
- output
- power supply
- transmission output
- 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.)
- Granted
Links
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- Telephone Function (AREA)
- Control Of Amplification And Gain Control (AREA)
- Amplifiers (AREA)
- Transmitters (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は無線通信機の送信出
力増幅器に用いられるオートパワーコントロール（ＡＰ
Ｃ）回路に関し、さらに詳細には定電流形ＡＰＣ回路に
関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic power control (AP) used for a transmission output amplifier of a radio communication device.
C) The circuit, and more particularly, to a constant current type APC circuit.
【０００２】[0002]
【従来の技術】無線通信機の送信出力増幅器に用いられ
るＡＰＣ回路には、種々の制御方式のものがある。その
中には送信出力増幅器の消費電流を検出しこれを一定に
保つように動作する方式のＡＰＣ回路（定電流型ＡＰＣ
回路とも記す）がある。2. Description of the Related Art APC circuits used in transmission output amplifiers of wireless communication devices have various control systems. Among them, an APC circuit (a constant-current type APC circuit) of a type operating to detect the current consumption of the transmission output amplifier and keep it constant.
Circuit).
【０００３】従来の定電流型ＡＰＣ回路は図３に示すよ
うに構成されている。[0003] A conventional constant current type APC circuit is configured as shown in FIG.
【０００４】図３に示す例では、送信出力増幅器（以
下、パワーモジュールとも記す）にＣＭＯＳ型のパワー
モジュール１を用いている。直流電源３の電圧、すなわ
ち電源電圧Ｖｄｄはパワーモジュール１のドレインに印
加し、ＡＰＣ制御電圧Ｖｇはパワーモジュール１のゲー
トに印加して、送信出力電力を一定に制御する。In the example shown in FIG. 3, a CMOS power module 1 is used as a transmission output amplifier (hereinafter, also referred to as a power module). The voltage of the DC power supply 3, that is, the power supply voltage Vdd is applied to the drain of the power module 1, and the APC control voltage Vg is applied to the gate of the power module 1 to control the transmission output power to be constant.
【０００５】送信出力電力の制御のために、直流電源３
の出力電圧を低抵抗の抵抗２を介してパワーモジュール
１に電源電圧Ｖｄｄとして印加し、抵抗２の両端の電位
差を差動増幅器４に入力して、この電位差から差動増幅
器４によって直流電源３の出力電流、すなわち送信出力
増幅器の消費電流Ｉを検出する。In order to control the transmission output power, a DC power supply 3
Is applied to the power module 1 via the low-resistance resistor 2 as the power supply voltage Vdd, and the potential difference between both ends of the resistor 2 is input to the differential amplifier 4. , Ie, the consumption current I of the transmission output amplifier.
【０００６】マイクロコンピュータからなる制御回路６
Ａから出力される基準電圧ＶＲＥＦ １を直流増幅器５の
非反転入力端に印加し、かつ差動増幅器４の出力電圧を
直流増幅器５の反転入力端に印加して、差動増幅器４の
出力電圧と基準電圧ＶＲＥＦ １との差分に応じたＡＰＣ
制御電圧Ｖｇを直流増幅器５から出力させて、ＡＰＣ制
御電圧Ｖｇをパワーモジュール１に印加して、送信出力
増幅器の送信出力電力を制御する。A control circuit 6 comprising a microcomputer
The reference voltage V REF 1 output from A is applied to the non-inverting input terminal of the DC amplifier 5, and the output voltage of the differential amplifier 4 is applied to the inverting input terminal of the DC amplifier 5. APC according to the difference between voltage and reference voltage V REF 1
The control voltage Vg is output from the DC amplifier 5 and the APC control voltage Vg is applied to the power module 1 to control the transmission output power of the transmission output amplifier.
【０００７】次に、基準電圧ＶＲＥＦ１の調整方法につ
いて具体的に説明する。Next, a method of adjusting the reference voltage V REF1 will be specifically described.
【０００８】直流電源３の定格電圧Ｖｄｒが７．５Ｖで
５Ｗの送信出力電力に調整する場合を例に説明する。直
流電源３の定格電圧Ｖｄｒが７．５Ｖで送信出力が５Ｗ
のときの、消費電流ＩとＡＰＣ制御電圧Ｖｇとはパワー
モジュール１の特性によって一義的に決まる。ここでは
例えばＶｇ＝２．０Ｖ、Ｉ＝１．５Ａとなる。An example will be described in which the rated voltage Vdr of the DC power supply 3 is 7.5 V and the transmission output power is adjusted to 5 W. The rated voltage Vdr of the DC power supply 3 is 7.5 V and the transmission output is 5 W
In this case, the consumption current I and the APC control voltage Vg are uniquely determined by the characteristics of the power module 1. Here, for example, Vg = 2.0 V and I = 1.5 A.
【０００９】また、パワーモジュール１の電源にかかる
電圧Ｖｄｄは、抵抗２での電圧降下が無視できる程度の
ために、直流電源３の出力電圧Ｖｄｄに等しいとする。
すなわち、直流電源電圧７．５Ｖにおける５Ｗ出力時の
電流Ｉ＝１．５Ａによって差動増幅器４の出力が決定さ
れ、差動増幅器４の出力とＡＰＣ制御電圧Ｖｇ＝２．０
Ｖとから基準電圧ＶＲＥＦ１が決定される。Further, it is assumed that the voltage Vdd applied to the power supply of the power module 1 is equal to the output voltage Vdd of the DC power supply 3 because the voltage drop at the resistor 2 is negligible.
That is, the output of the differential amplifier 4 is determined by the current I = 1.5 A at the time of 5 W output at the DC power supply voltage of 7.5 V, and the output of the differential amplifier 4 and the APC control voltage Vg = 2.0
From V, a reference voltage V REF1 is determined.
【００１０】したがって、送信出力電力の調整時には電
力計によって５Ｗになるように基準ＶＲＥＦ１を調整す
ることになる。Therefore, when the transmission output power is adjusted, the reference V REF1 is adjusted so as to be 5 W by the wattmeter.
【００１１】実際には直流電源３から供給される出力電
圧Ｖｄｄが定格電圧Ｖｄｒで、目的の送信出力電力が確
保されていれば問題はないので、通常、送信出力電力の
調整は定格電圧Ｖｄｒで行われる。In practice, the output voltage Vdd supplied from the DC power supply 3 is the rated voltage Vdr, and there is no problem if the desired transmission output power is secured. Therefore, the transmission output power is usually adjusted by the rated voltage Vdr. Done.
【００１２】図４に従来のＡＰＣ回路によるときの直流
電源３からの出力電圧Ｖｄｄの変化に対する、送信出力
電力ｂ′（図４のｂ′参照）、消費電流Ｉ′（図４の
ｃ′参照）、基準電圧ＶＲＥＦａ′（図４のａ′参照）
の変化を示す。FIG. 4 shows the transmission output power b '(see b' in FIG. 4) and the consumption current I '(see c' in FIG. 4) with respect to a change in the output voltage Vdd from the DC power supply 3 when using the conventional APC circuit. ), Reference voltage V REF a '(see a' in FIG. 4)
Shows the change in
【００１３】基準電圧ＶＲＥＦ１は、調整をする電圧、
すなわち定格電圧Ｖｄｒ７．５Ｖによって決定される。
直流電源３の出力電圧Ｖｄｄを変化させたとき、消費電
流Ｉを保つようにＡＰＣ回路は動作するために、消費電
流Ｉ′は図４のように一定となる。ここで、送信出力電
力Ｐ１、消費電流Ｉ１、基準電圧ＶＲＥＦ１は直流電源
３からの出力電圧Ｖｄｄが定格電圧Ｖｄｒのときにおけ
る送信出力電力Ｐ、消費電流Ｉ、基準電圧ＶＲＥＦを示
している。The reference voltage V REF1 is a voltage to be adjusted,
That is, it is determined by the rated voltage Vdr 7.5V.
When the output voltage Vdd of the DC power supply 3 is changed, the APC circuit operates so as to maintain the current consumption I, so that the current consumption I 'is constant as shown in FIG. Here, the transmission output power P 1 , the consumption current I 1 , and the reference voltage V REF1 indicate the transmission output power P, the consumption current I, and the reference voltage V REF when the output voltage Vdd from the DC power supply 3 is the rated voltage Vdr. I have.
【００１４】例えば、直流電源３の出力電圧Ｖｄｄが上
昇し、送信出力電力Ｐが増加したときには、これに伴い
消費電流Ｉも増加する。ＡＰＣ回路はこの消費電流Ｉの
増加を検出し、消費電流Ｉを一定に保つようＡＰＣ制御
電圧Ｖｇを下げ、消費電流Ｉを減少させるよう作用す
る。これによって送信出力電力Ｐを下げる方向に制御す
る。For example, when the output voltage Vdd of the DC power supply 3 increases and the transmission output power P increases, the current consumption I increases accordingly. The APC circuit detects the increase in the current consumption I, acts to lower the APC control voltage Vg so as to keep the current consumption I constant, and to decrease the current consumption I. Thereby, the transmission output power P is controlled in a lowering direction.
【００１５】一方、直流電源３の出力電圧Ｖｄｄが低下
すると、これに伴い消費電流Ｉは減少する。したがっ
て、ＡＰＣ回路は消費電流Ｉを一定に保つようにＡＰＣ
制御電圧Ｖｇを増加させ、消費電流Ｉを増加させようと
する。このため、送信出力電力Ｐは増加方向に向かう。
図４はこの様子を示している。On the other hand, when the output voltage Vdd of the DC power supply 3 decreases, the current consumption I decreases accordingly. Therefore, the APC circuit controls the APC circuit so that the current consumption I is kept constant.
The control voltage Vg is increased to increase the current consumption I. For this reason, the transmission output power P tends to increase.
FIG. 4 shows this state.
【００１６】[0016]
【発明が解決しようとする課題】このようにＡＰＣ回路
は消費電流を一定に保つことを目的としている。したが
って直流電源電圧の変動に対して効率が一定とすると、
消費電流を一定に保つこのＡＰＣ回路では、直流電源電
圧が上昇すると送信出力電力は増加する。ＡＰＣ回路は
本来送信出力電力を一定にすることを目的としている
が、目的とする送信電力よりも大きい送信出力電力を出
力することは直流電源にとって無駄であり、電池駆動の
無線通信機では電池の消耗が増加して大きな問題とな
る。Thus, the purpose of the APC circuit is to keep the current consumption constant. Therefore, assuming that the efficiency is constant against fluctuations in the DC power supply voltage,
In this APC circuit that keeps the current consumption constant, the transmission output power increases as the DC power supply voltage increases. Although the APC circuit is originally intended to keep the transmission output power constant, it is wasteful for a DC power supply to output a transmission output power that is larger than the intended transmission power, and a battery-powered wireless communication device uses a battery. Increased wear is a major problem.
【００１７】本発明は、目的とする送信出力電力以上の
出力を抑制したＡＰＣ回路を提供することを目的とす
る。An object of the present invention is to provide an APC circuit that suppresses an output higher than a target transmission output power.
【００１８】[0018]
【課題を解決するための手段】本発明にかかるオートパ
ワーコントロール回路は、直流電源の出力電圧が定格電
圧のときに送信出力増幅器から所定の送信出力電力を出
力させるための基準電圧を送出する制御回路と、前記直
流電源から前記送信出力増幅器に供給される消費電流に
基づく電圧と前記基準電圧との差に基づいて送信出力増
幅器の送信出力電力を制御するオートパワーコントロー
ル回路において、前記直流電源の出力電圧を受けて前記
直流電源の出力電圧が前記定格電圧を超えたとき前記直
流電源の出力電圧と前記定格電圧との差電圧を検出する
電源電圧比較手段と、検出された差電圧に基づいて前記
基準電圧を順次低減させる基準電圧低減手段とを制御回
路に備え、前記検出された差電圧に拘わらず送信出力電
力を前記所定の送信出力電力に維持することを特徴とす
る。An automatic power control circuit according to the present invention is a control circuit for transmitting a reference voltage for outputting a predetermined transmission output power from a transmission output amplifier when an output voltage of a DC power supply is a rated voltage. Circuit, an automatic power control circuit that controls the transmission output power of the transmission output amplifier based on the difference between the voltage based on the current consumption supplied to the transmission output amplifier from the DC power supply and the reference voltage, Power supply voltage comparison means for detecting a difference voltage between the output voltage of the DC power supply and the rated voltage when the output voltage of the DC power supply exceeds the rated voltage in response to the output voltage, based on the detected difference voltage And a reference voltage reducing means for sequentially reducing the reference voltage, wherein the control circuit is configured to transmit the transmission output power to the predetermined transmission power regardless of the detected difference voltage. And maintains the output power.
【００１９】本発明にかかるオートパワーコントロール
回路によれば、制御回路において、直流電源の出力電圧
を受けて直流電源の出力電圧が定格電圧を超えたとき直
流電源の出力電圧と定格電圧との差電圧が電源電圧比較
手段によって検出され、検出された差電圧に基づいて基
準電圧が基準電圧低減手段によって順次低減させられる
ため、検出された差電圧に拘わらず送信出力電力が所定
の送信出力電力に維持される。According to the automatic power control circuit of the present invention, when the output voltage of the DC power supply exceeds the rated voltage in response to the output voltage of the DC power supply, the difference between the output voltage of the DC power supply and the rated voltage is received by the control circuit. Since the voltage is detected by the power supply voltage comparing means and the reference voltage is sequentially reduced by the reference voltage reducing means based on the detected difference voltage, the transmission output power becomes the predetermined transmission output power regardless of the detected difference voltage. Will be maintained.
【００２０】したがって、本発明にかかるオートパワー
コントロール回路によれば、直流電源の出力電圧に拘わ
らず、所定の送信出力電力以上の出力が抑制されること
になって、直流電源の消耗が抑制される。Therefore, according to the automatic power control circuit of the present invention, regardless of the output voltage of the DC power supply, the output exceeding the predetermined transmission output power is suppressed, and the consumption of the DC power supply is suppressed. You.
【００２１】[0021]
【発明の実施の形態】以下、本発明にかかるＡＰＣ回路
を実施の一形態によって説明する。DESCRIPTION OF THE PREFERRED EMBODIMENTS An APC circuit according to the present invention will be described below with reference to an embodiment.
【００２２】図１は本発明の実施の一形態にかかるＡＰ
Ｃ回路の構成を示すブロック図である。FIG. 1 shows an AP according to an embodiment of the present invention.
FIG. 3 is a block diagram illustrating a configuration of a C circuit.
【００２３】図１に示す本発明の実施の一形態にかかる
ＡＰＣ回路１０は、図３に示した従来のＡＰＣ回路にお
ける制御回路６Ａに代わって、制御回路６を設けてあ
る。その他の構成は図３に示した従来のＡＰＣ回路の場
合と同様であり、その説明は重複を避けるために省略す
る。An APC circuit 10 according to an embodiment of the present invention shown in FIG. 1 is provided with a control circuit 6 instead of the control circuit 6A in the conventional APC circuit shown in FIG. Other configurations are the same as those of the conventional APC circuit shown in FIG. 3, and description thereof will be omitted to avoid duplication.
【００２４】ＡＰＣ回路１０においては、制御回路６は
Ａ／Ｄ変換器を内蔵すると共に、直流電源３の電源電圧
Ｖｄｄを定格電圧Ｖｄｒと比較し、電源電圧Ｖｄｄが定
格電圧Ｖｄｒを超えている電圧値（（Ｖｄｒ−Ｖｄｄ）
＜０）を検出する電源電圧比較手段６１と、電源電圧比
較手段６１によって検出された電圧値（Ｖｄｒ−Ｖｄ
ｄ）に基づいて基準電圧ＶＲＥＦを基準電圧ＶＲＥＦ１
から順次低減させて、ＡＰＣ制御電圧Ｖｇに基づく送信
出力電力Ｐを、定格電圧Ｖｄｒのときの送信出力電力Ｐ
１に制御する基準電圧低減手段６２とを機能的に備え
て、制御回路６のＡ／Ｄ入力端子に直流電源３の出力電
圧Ｖｄｄを印加し、制御回路６から出力される基準電圧
ＶＲＥＦを直流増幅器５の非反転入力端に印加する。In the APC circuit 10, the control circuit 6 has a built-in A / D converter, compares the power supply voltage Vdd of the DC power supply 3 with the rated voltage Vdr, and determines whether the power supply voltage Vdd exceeds the rated voltage Vdr. Value ((Vdr-Vdd)
<0), and a voltage value (Vdr−Vd) detected by the power supply voltage comparing unit 61.
d), the reference voltage V REF is changed to the reference voltage V REF1.
, The transmission output power P based on the APC control voltage Vg is reduced to the transmission output power P at the rated voltage Vdr.
1 and a reference voltage reducing means 62 for controlling the output voltage Vdd of the DC power supply 3 to the A / D input terminal of the control circuit 6 to output the reference voltage V REF output from the control circuit 6. The voltage is applied to the non-inverting input terminal of the DC amplifier 5.
【００２５】上記のように構成されたＡＰＣ回路１０に
おける基準電圧ＶＲＥＦの調整について説明する。The adjustment of the reference voltage V REF in the APC circuit 10 configured as described above will be described.
【００２６】まず、定格電圧Ｖｄｒで目的とする送信出
力電力Ｐ１の出力となるように基準電圧ＶＲＥＦ１を調
整する。次に、直流電源３の想定される最大出力電圧で
再び目的とする送信出力電力Ｐ１の出力となるように基
準電圧ＶＲＥＦ２に調整する。この設定によって、制御
回路６の制御の下に、直流電源３の出力電圧Ｖｄｄが定
格電圧Ｖｄｒから最大電圧までの区間においては、基準
電圧ＶＲＥＦを基準電圧ＶＲＥＦ１から基準電圧
ＶＲＥＦ２にまで（Ｖｄｒ−Ｖｄｄ）の値に基づいて徐
々に低下させる。First, the reference voltage V REF1 is adjusted so that the target transmission output power P 1 is output at the rated voltage Vdr. Next, the reference voltage V REF2 is adjusted so that the output of the target transmission output power P 1 is again obtained at the assumed maximum output voltage of the DC power supply 3. This setting controls under the control of the circuit 6, in the section of the output voltage Vdd of the DC power source 3 from the rated voltage Vdr to the maximum voltage, the reference voltage the reference voltage V REF from the reference voltage V REF1
It is gradually reduced to VREF2 based on the value of (Vdr-Vdd).
【００２７】なお、直流電源３の出力電圧Ｖｄｄが定格
電圧Ｖｄｒ以下では従来と同様に、基準電圧ＶＲＥＦは
基準電圧ＶＲＥＦ１の一定値とする。When the output voltage Vdd of the DC power supply 3 is equal to or lower than the rated voltage Vdr, the reference voltage V REF is a constant value of the reference voltage V REF1 as in the related art.
【００２８】従来は、調整した直流電源３の出力電圧が
定格電圧Ｖｄｒの時に定めた基準電圧ＶＲＥＦ１は、直
流電源３の出力電圧が上昇しても一定のままで、消費電
流Ｉも一定に保たれていたのに対し、ＡＰＣ回路１０に
よれば、直流電源３の出力電圧が定格電圧Ｖｄｒよりも
高い場合には基準電圧ＶＲＥＦが基準電圧ＶＲＥＦ１か
ら順次下げられ、消費電流Ｉも消費電流Ｉ１から順次低
下せられて、送信出力電力Ｐは送信出力電力Ｐ１に維持
される。Conventionally, the reference voltage V REF1 determined when the adjusted output voltage of the DC power supply 3 is the rated voltage Vdr remains constant even when the output voltage of the DC power supply 3 increases, and the current consumption I is also constant. On the other hand, according to the APC circuit 10, when the output voltage of the DC power supply 3 is higher than the rated voltage Vdr, the reference voltage V REF is sequentially reduced from the reference voltage V REF1 , and the current consumption I is also reduced. are brought successively reduced from the current I 1, the transmission output power P is kept at the transmission output power P 1.
【００２９】この状態は図２に示す如くであって、直流
電源３の出力電圧Ｖｄｄが定格電圧Ｖｄｒ以下のとき
は、従来の場合と同様であるが、直流電源３の出力電圧
Ｖｄｄが定格電圧Ｖｄｒを超えると、差電圧（Ｖｄｒ−
Ｖｄｄ）の値に基づいて、基準電圧ＶＲＥＦが図２のａ
に示すように基準電圧ＶＲＥＦ１から順次ＶＲＥＦ２に
まで下げられ、消費電流Ｉも図２のｃに示すように消費
電流Ｉ１から順次消費電流Ｉ２にまで低下せられて、送
信出力電力Ｐは差電圧（Ｖｄｒ−Ｖｄｄ）の値に拘わら
ず図２のｂに示すように送信出力電力Ｐ１に維持され
る。This state is as shown in FIG. 2. When the output voltage Vdd of the DC power supply 3 is equal to or lower than the rated voltage Vdr, it is the same as the conventional case. When the voltage exceeds Vdr, the difference voltage (Vdr−
Based on the value of Vdd), the reference voltage V REF is
As shown in FIG. 2, the reference voltage V REF1 is sequentially reduced to V REF2 , and the current consumption I is also sequentially reduced from the current consumption I 1 to the current consumption I 2 as shown in FIG. It is maintained at the transmission output power P 1 as shown in b of FIG. 2 regardless of the value of the differential voltage (Vdr-Vdd).
【００３０】[0030]
【発明の効果】以上説明したように、本発明にかかるＡ
ＰＣ回路によれば、直流電源の出力電圧に拘わらず送信
出力電力が目的とする送信出力電力に抑えられる。この
結果、無線通信機が電池駆動のとき電池の消耗が抑えら
れる。As described above, according to the present invention, A
According to the PC circuit, the transmission output power can be suppressed to the target transmission output power regardless of the output voltage of the DC power supply. As a result, when the wireless communication device is driven by a battery, the consumption of the battery is suppressed.
【図１】本発明の実施の一形態にかかるＡＰＣ回路の構
成を示すブロック図である。FIG. 1 is a block diagram illustrating a configuration of an APC circuit according to an embodiment of the present invention.
【図２】本発明の実施の一形態にかかるＡＰＣ回路の作
用の説明に供する特性図である。FIG. 2 is a characteristic diagram for explaining the operation of the APC circuit according to the embodiment of the present invention;
【図３】従来のＡＰＣ回路の構成を示すブロック図であ
る。FIG. 3 is a block diagram showing a configuration of a conventional APC circuit.
【図４】図３に示すＡＰＣ回路の作用の説明に供する特
性図である。FIG. 4 is a characteristic diagram for explaining the operation of the APC circuit shown in FIG. 3;
１ 送信出力増幅器 ２ 抵抗 ３ 直流電源 ４ 差動増幅器 ５ 直流増幅器 ６および６Ａ 制御回路 DESCRIPTION OF SYMBOLS 1 Transmission output amplifier 2 Resistance 3 DC power supply 4 Differential amplifier 5 DC amplifier 6 and 6A Control circuit
Claims (1)
信出力増幅器から所定の送信出力電力を出力させるため
の基準電圧を送出する制御回路と、前記直流電源から前
記送信出力増幅器に供給される消費電流に基づく電圧と
前記基準電圧との差に基づいて送信出力増幅器の送信出
力電力を制御するオートパワーコントロール回路におい
て、 前記直流電源の出力電圧を受けて前記直流電源の出力電
圧が前記定格電圧を超えたとき前記直流電源の出力電圧
と前記定格電圧との差電圧を検出する電源電圧比較手段
と、検出された差電圧に基づいて前記基準電圧を順次低
減させる基準電圧低減手段とを制御回路に備え、前記検
出された差電圧に拘わらず送信出力電力を前記所定の送
信出力電力に維持することを特徴とするオートパワーコ
ントロール回路。1. A control circuit for sending a reference voltage for outputting a predetermined transmission output power from a transmission output amplifier when an output voltage of a DC power supply is a rated voltage, and a control circuit for supplying a reference voltage from the DC power supply to the transmission output amplifier. An automatic power control circuit that controls a transmission output power of a transmission output amplifier based on a difference between a voltage based on a consumed current and the reference voltage, the output voltage of the DC power supply receiving the output voltage of the DC power supply being the rated voltage. A power supply voltage comparing means for detecting a difference voltage between the output voltage of the DC power supply and the rated voltage when the voltage is exceeded, and a reference voltage reducing means for sequentially reducing the reference voltage based on the detected difference voltage are controlled. An automatic power control circuit for maintaining a transmission output power at the predetermined transmission output power irrespective of the detected difference voltage. Road.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000120225A JP3645785B2 (en) | 2000-04-21 | 2000-04-21 | Auto power control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000120225A JP3645785B2 (en) | 2000-04-21 | 2000-04-21 | Auto power control circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2001308664A true JP2001308664A (en) | 2001-11-02 |
| JP3645785B2 JP3645785B2 (en) | 2005-05-11 |
Family
ID=18631072
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2000120225A Expired - Lifetime JP3645785B2 (en) | 2000-04-21 | 2000-04-21 | Auto power control circuit |
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| Country | Link |
|---|---|
| JP (1) | JP3645785B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006035799A1 (en) * | 2004-09-28 | 2006-04-06 | Aisin Seiki Kabushiki Kaisha | Antenna drive |
| JP2020136988A (en) * | 2019-02-22 | 2020-08-31 | アイコム株式会社 | Current detection resistance switching apparatus for apc circuit |
-
2000
- 2000-04-21 JP JP2000120225A patent/JP3645785B2/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006035799A1 (en) * | 2004-09-28 | 2006-04-06 | Aisin Seiki Kabushiki Kaisha | Antenna drive |
| US7933325B2 (en) | 2004-09-28 | 2011-04-26 | Aisin Seiki Kabushiki Kaisha | Antenna driving apparatus |
| JP2020136988A (en) * | 2019-02-22 | 2020-08-31 | アイコム株式会社 | Current detection resistance switching apparatus for apc circuit |
| JP7332852B2 (en) | 2019-02-22 | 2023-08-24 | アイコム株式会社 | Current detection resistor switching device for APC circuit |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3645785B2 (en) | 2005-05-11 |
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