JPH06339265A - Switching regulator - Google Patents
Switching regulatorInfo
- Publication number
- JPH06339265A JPH06339265A JP12640493A JP12640493A JPH06339265A JP H06339265 A JPH06339265 A JP H06339265A JP 12640493 A JP12640493 A JP 12640493A JP 12640493 A JP12640493 A JP 12640493A JP H06339265 A JPH06339265 A JP H06339265A
- Authority
- JP
- Japan
- Prior art keywords
- current
- dummy load
- output
- load
- converter circuit
- 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.)
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- Dc-Dc Converters (AREA)
- Continuous-Control Power Sources That Use Transistors (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】この発明は、電子機器の定電圧直
流電源として一般に使用されるスイッチングレギュレ−
タ、ことに軽負荷状態での負荷電流の脈動を低減するた
めのダミ−負荷抵抗を備えたスイッチングレギュレ−タ
に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a switching regulator generally used as a constant voltage DC power source for electronic equipment.
In particular, the present invention relates to a switching regulator having a dummy load resistance for reducing the pulsation of load current in a light load state.
【０００２】[0002]
【従来の技術】図３は従来のスイッチングレギュレ−タ
の基本回路を簡略化して示す接続図であり、スイッチン
グレギュレ−タの基本回路はＤＣ−ＤＣコンバ−タ回路
１と、その出力側に接続されたダミ−負荷抵抗９とで構
成される。ＤＣ−ＤＣコンバ−タ回路１はパルストラン
ス３と、その一次巻線に流れる電流ｉ1 をオンオフ制御
する半導体スイッチ２とで直流電圧Ｅ1 を数ＫＨZ から
数１００ＫＨZ の方形波の交流に変換するインバ−タ部
と、パルストランス３の二次巻線に接続された整流ダイ
オ−ド４，出力リアクトル６，およびコンデンサ７から
なり、パルストランスで所望の電圧に調整された二次巻
線電圧を直流電圧に変換して外部負荷１０に向けて出力
する整流平滑回路と、半導体スイッチ２のオン期間中出
力リアクトル６に蓄積されたエネルギ−を半導体スイッ
チのオフ期間中負荷１０を経由してリアクトル６に還流
する帰還ダイオ−ド５とで構成され、半導体スイッチ２
のオン時間ｔon，オフ時間ｔoff ，およびオンオフ周期
Ｔは制御回路８によって時比率制御される。2. Description of the Related Art FIG. 3 is a connection diagram showing a simplified basic circuit of a conventional switching regulator. The basic circuit of the switching regulator is connected to a DC-DC converter circuit 1 and its output side. It is composed of a dummy load resistor 9. DC-DC converter - converting capacitor circuit 1 and the pulse transformer 3, the square wave alternating current having 100KH Z DC voltage E1 of several KH Z in the current i 1 flowing through the primary winding and the semiconductor switch 2 off control The secondary winding voltage adjusted by the pulse transformer to a desired voltage is composed of an inverter section, a rectifying diode 4 connected to the secondary winding of the pulse transformer 3, an output reactor 6, and a capacitor 7. Rectifying and smoothing circuit for converting the DC voltage into a DC voltage and outputting the DC voltage to the external load 10, and the energy stored in the output reactor 6 during the ON period of the semiconductor switch 2 via the load 10 during the OFF period of the semiconductor switch. 6 and a feedback diode 5 that returns to the
The on-time ton, off-time toff, and on-off cycle T of the are controlled by the control circuit 8 at a duty ratio.
【０００３】図４は図３のように構成された従来のスイ
ッチングレギュレ−タの基本回路の動作を示す波形図で
あり、半導体スイッチ２およびダイオ−ド４，５を理想
スイッチと考え、且つパルストランス３の変圧比を１と
仮定するれば、半導体スイッチ２を周期Ｔでオンオフ制
御するとき出力電圧ｅ2 の平均値Ｅ2 は次式で表され
る。 Ｅ2 ＝（ｔon／ｔon＋ｔoff ）Ｅ1 ＝（ｔon／Ｔ）Ｅ1 ＝αＥ1 ・・（式１） 但し、Ｔ＝ｔon＋ｔoff ，α＝ｔon／Ｔ（オン時比率）
であり、出力電圧ｅ2の平均値Ｅ2 を半導体スイッチ２
のオン時比率αに比例して制御できるとともに、パルス
トランス３の変圧比の決め方により出力電圧の最高値を
任意に設定することができる。FIG. 4 is a waveform diagram showing the operation of the basic circuit of the conventional switching regulator configured as shown in FIG. 3, in which the semiconductor switch 2 and the diodes 4 and 5 are considered to be ideal switches, and the pulse is used. Assuming that the transformation ratio of the transformer 3 is 1, the average value E 2 of the output voltage e 2 when the semiconductor switch 2 is on / off controlled in the cycle T is expressed by the following equation. E 2 = (t on / t on + t off ) E 1 = (t on / T) E 1 = αE 1 (Equation 1) where T = t on + t off , α = t on / T (when on ratio)
And the average value E 2 of the output voltage e 2 is determined by the semiconductor switch 2
It is possible to control in proportion to the on-time ratio α, and it is possible to arbitrarily set the maximum value of the output voltage depending on how to determine the transformation ratio of the pulse transformer 3.
【０００４】また、外部負荷１０とダミ−負荷９とに分
流して流れるＤＣ−ＤＣコンバ−タ回路１の出力電流ｉ
2 は半導体スイッチ２のオン期間中上昇し，オフ期間中
下降する連続した脈動電流となる。即ち、出力電流ｉ2
の脈動率μは出力リアクトル６のインダクタンスをＬと
し、パルストランス３の変圧比を１と仮定した場合次式
で近似される。 μ≒（Ｅ1 ／２Ｉ2 Ｌ）（ｔon・ｔoff ／Ｔ）・・（式２） したがって、出力電流ｋ 平均値Ｉ2 が減少するとこれ
に逆比例して脈動率μが増大するので、出力電流の平均
値Ｉ2 が定挌電流の３０％を越える通常運転において
は、オン時比率αを絞る制御を行って脈動率μの増大を
抑制した状態で運転が行われる。ところが、出力電流の
平均値Ｉ2 が定挌電流の３０％以下の軽負荷状態とな
り、これに対応してオン時比率αを絞る制御を行うと、
出力電流の制御が不安定になり、ときには出力電流ｉ2
（パルス）が欠損してオンオフ周期Ｔが不安定となり、
出力直流電圧Ｅ2 の定電圧制御に悪影響を及ぼすという
問題が生ずる。そこで、このような不都合を回避するた
めに従来のスイッチングレギュレ−タでは、ＤＣ−ＤＣ
コンバ−タ回路１の出力側にダミ−負荷抵抗９を接続
し、定挌電流の１０〜２０％程度のダミ−負荷電流を常
時流すことにより、オンオフ周期を安定化するととも
に、出力電流の脈動率の上昇を抑制するよう構成したも
のが知られている。Further, the output current i of the DC-DC converter circuit 1 which is divided into the external load 10 and the dummy load 9 and flows.
2 is a continuous pulsating current that rises during the ON period of the semiconductor switch 2 and falls during the OFF period. That is, the output current i 2
When the inductance of the output reactor 6 is L and the transformation ratio of the pulse transformer 3 is 1, the pulsation rate μ of is approximated by the following equation. μ≈ (E 1 / 2I 2 L) (t on · t off / T) ··· (Equation 2) Therefore, when the output current k average value I 2 decreases, the pulsation rate μ increases in inverse proportion to this. In the normal operation in which the average value I 2 of the output current exceeds 30% of the constant depletion current, the operation is performed in a state in which the increase in the pulsation rate μ is suppressed by controlling the on-time ratio α. However, when the average value I 2 of the output current is 30% or less of the constant current and is in a light load state, and the control for narrowing down the on-time ratio α is performed correspondingly,
The output current control becomes unstable, and sometimes the output current i 2
(Pulse) is missing and the on / off cycle T becomes unstable,
There is a problem that the constant voltage control of the output DC voltage E 2 is adversely affected. Therefore, in order to avoid such an inconvenience, the conventional switching regulator uses DC-DC.
By connecting a dummy load resistor 9 to the output side of the converter circuit 1 and constantly flowing a dummy load current of about 10 to 20% of the constant rush current, the on / off cycle is stabilized and the pulsation of the output current is stabilized. It is known to be configured to suppress the increase in the rate.
【０００５】[0005]
【発明が解決しようとする課題】ダミ−負荷抵抗９を設
けた従来のスイッチングレギュレ−タでは、ダミ−負荷
９に常時電流を流しているため、制御の安定化を必要と
しない定挌電流の３０％を越える通常運転領域でも定挌
電流の１０〜２０％に相当する余分な出力電流Ｉ 2 が無
駄に流れることになり、その分スイッチングレギュレ−
タの定挌運転領域でオ−バ−ロ−ドとなるため、スイッ
チングレギュレ−タの出力の増大が必要になり、スイッ
チングレギュレ−タの大型化を招くという問題点があ
る。また、スイッチングレギュレ−タの容量を増加しな
かった場合には、ダミ−負荷に対応して外部負荷１０へ
の供給電力が制約されるという問題が発生する。さら
に、ダミ−負荷９で発生する損失によってスイッチング
レギュレ−タの電力変換効率が低下するという問題も発
生する。一方、（式２）から明らかなように、スイッチ
ングレギュレ−タでは出力電流ｉ2 の脈動率μが、出力
電流ｉ2 の平均値Ｉ2 および出力リアクトル６のインダ
クタンスＬに逆比例して変化するので、出力リアクトル
６のインダクタンスＬを増しても脈動率μの増大を抑制
し制御の安定性を増すことが可能であるが、これが原因
でリアクトルが大型化するという問題も発生する。A dummy load resistor 9 is provided.
With conventional switching regulators,
Since the current is always flowing to 9, it is necessary to stabilize the control.
Not in constant operation range over 30% of constant operation current
An extra output current I corresponding to 10 to 20% of the current 2Nothing
It will be useless, and the switching regulation-
The switch will be overloaded in the constant operating range,
It is necessary to increase the output of the tuning regulator and switch
There is a problem that the ching regulator becomes large.
It Also, do not increase the capacity of the switching regulator.
If it is wrong, go to the external load 10 corresponding to the dummy load.
However, there is a problem that the power supply is limited. Furthermore
And switching due to the loss generated in the dummy load 9.
There is also a problem that the power conversion efficiency of the regulator decreases.
To live. On the other hand, as is clear from (Equation 2), the switch
In the regulator, output current i2The pulsation rate μ of the output
Current i2Average value of2And output reactor 6 inder
Since it changes in inverse proportion to the inductance L, the output reactor
Even if the inductance L of 6 is increased, the increase of pulsation rate μ is suppressed.
It is possible to increase the control stability, but this is the cause
There is also a problem that the reactor becomes large.
【０００６】この発明の目的は、電力変換効率の低下や
出力リアクトルの大型化を伴わず、軽負荷時の出力を安
定化したスイッチングレギュレ−タを得ることにある。An object of the present invention is to obtain a switching regulator that stabilizes the output at a light load without lowering the power conversion efficiency and increasing the size of the output reactor.
【０００７】[0007]
【課題を解決するための手段】上記課題を解決するため
に、この発明によれば、半導体スイッチのオン時間とオ
フ時間の割合を制御することにより直流入力電圧を任意
の直流電圧に変換して外部負荷に供給するＤＣ−ＤＣコ
ンバ−タ回路と、その出力側に接続されたダミ−負荷抵
抗とを備えたものにおいて、前記ＤＣ−ＤＣコンバ−タ
回路の出力電流を検出し、その検出電流値が予め定まる
電流値を越えたとき前記ダミ−負荷抵抗に流れる電流を
遮断するダミ−負荷電流の制御手段を備えてなるものと
する。In order to solve the above-mentioned problems, according to the present invention, a direct-current input voltage is converted into an arbitrary direct-current voltage by controlling the ratio of on-time and off-time of a semiconductor switch. An output current of the DC-DC converter circuit is detected in a device including a DC-DC converter circuit supplied to an external load and a dummy load resistor connected to the output side thereof, and the detected current is detected. A dummy load current control means for interrupting the current flowing through the dummy load resistor when the value exceeds a predetermined current value is provided.
【０００８】また、ダミ−負荷電流の制御手段がＤＣ−
ＤＣコンバ−タ回路の出力電流を検出する電流検出器
と、ダミ−負荷抵抗に直列接続され前記電流検出器の検
出電流値が予め定まる電流値を越えたときダミ−負荷抵
抗に流れる電流を遮断する半導体スイッチとを備えてな
るものとする。さらに、ダミ−負荷電流の制御手段がＤ
Ｃ−ＤＣコンバ−タ回路の出力電流をその出力リアクト
ルの抵抗電圧降下として検出する差動増幅回路と、ダミ
−負荷抵抗に直列接続され前記差動増幅回路の検出電圧
値が予め定まる電圧値を越えたときダミ−負荷抵抗に流
れる電流を遮断する半導体スイッチとからなるものとす
る。Further, the control means for the dummy load current is DC-
A current detector for detecting the output current of the DC converter circuit, and a current connected to the dummy load resistor in series, and interrupting the current flowing through the dummy load resistor when the detected current value of the current detector exceeds a predetermined current value. And a semiconductor switch that operates. Further, the control means for the dummy load current is D
A differential amplifier circuit that detects the output current of the C-DC converter circuit as a resistance voltage drop of the output reactor, and a voltage value that is connected in series to the dummy load resistor and that has a predetermined detection voltage value of the differential amplifier circuit. It shall consist of a semiconductor switch that cuts off the current flowing through the dummy load resistance when it exceeds.
【０００９】[0009]
【作用】この発明において、ＤＣ−ＤＣコンバ−タ回路
の出力電流を検出し、その検出電流値が予め定まる電流
値を越えたときダミ−負荷抵抗に流れる電流を遮断する
ダミ−負荷電流の制御手段を備えるよう構成したことに
より、負荷電流の脈動率の増大やオンオフ周期の不安定
性が問題になる軽負荷領域でのみダミ−負荷電流を流し
て脈動率を抑制することが可能となり、脈動率の抑制を
必要としない定挌負荷領域でもダミ−負荷電流を流すこ
とによって生ずる装置の大型化や電力変換効率の低下を
防ぎ、外部負荷への供給電力の制約を排除する機能が得
られる。In the present invention, the output of the DC-DC converter circuit is detected, and when the detected current value exceeds a predetermined current value, the current flowing through the dummy load resistor is cut off to control the dummy load current. With the configuration including the means, it becomes possible to suppress the pulsation rate by flowing the dummy load current only in the light load region where the increase of the pulsation rate of the load current and the instability of the on / off cycle become a problem. Even in a constant load region that does not require suppression, it is possible to obtain a function of preventing an increase in size of the device and a decrease in power conversion efficiency caused by flowing a dummy load current, and eliminating a restriction of power supplied to an external load.
【００１０】また、ダミ−負荷電流の制御手段を、ＤＣ
−ＤＣコンバ−タ回路の出力電流を検出する電流検出器
と、ダミ−負荷抵抗に直列接続され電流検出器の検出電
流値が予め定まる電流値を越えたときダミ−負荷抵抗に
流れる電流を遮断する半導体スイッチとで構成すれば、
ＤＣ−ＤＣコンバ−タ回路の出力電流を例えばシャント
抵抗分流器などで検出して半導体スイッチを動作できる
ので、簡素な構成のダミ−負荷電流の制御手段によりス
イッチングレギュレ−タの電力変換効率の低下を防ぎ、
外部負荷への供給電力の制約や装置の大型化を排除する
機能が得られる。Further, the dummy load current control means is a DC
-A current detector that detects the output current of the DC converter circuit, and is connected in series with the dummy load resistor, and shuts off the current flowing through the dummy load resistor when the detected current value of the current detector exceeds a predetermined current value. If it is configured with a semiconductor switch,
Since the semiconductor switch can be operated by detecting the output current of the DC-DC converter circuit with, for example, a shunt resistor shunt, the power conversion efficiency of the switching regulator is reduced by the dummy load current control means having a simple structure. Prevent
It is possible to obtain the function of eliminating restrictions on the power supplied to the external load and increasing the size of the device.
【００１１】さらに、ダミ−負荷電流の制御手段を、Ｄ
Ｃ−ＤＣコンバ−タ回路の出力電流をその出力リアクト
ルの抵抗電圧降下として検出する差動増幅回路と、ダミ
−負荷抵抗に直列接続され差動増幅回路の検出電圧値が
予め定まる電圧値を越えたときダミ−負荷抵抗に流れる
電流を遮断する半導体スイッチとで構成すれば、半導体
スイッチのオンオフに同期してエネルギ−の蓄積と放出
を行うことによりインダクタンス電圧降下の平均値が零
となる出力リアクトルの特性を利用して、ＤＣ−ＤＣコ
ンバ−タ回路の出力電流をその出力リアクトルの抵抗電
圧降下として検出することが可能となり、ダミ−負荷電
流の制御手段の構成をより簡素化する機能が得られる。Further, the control means for the dummy load current is D
A differential amplifier circuit that detects the output current of the C-DC converter circuit as a resistance voltage drop of its output reactor, and a detection voltage value of the differential amplifier circuit that is connected in series with a dummy load resistor exceeds a predetermined voltage value. If it is composed of a semiconductor switch that cuts off the current flowing in the dummy load resistance when it is turned on, the output reactor in which the average value of the inductance voltage drop becomes zero by storing and releasing energy in synchronization with the turning on and off of the semiconductor switch. It is possible to detect the output current of the DC-DC converter circuit as a resistance voltage drop of the output reactor by utilizing the characteristics of, and to obtain the function of further simplifying the configuration of the dummy load current control means. To be
【００１２】[0012]
【実施例】以下、この発明を実施例に基づいて説明す
る。図１はこの発明の実施例になるスイッチングレギュ
レ−タの主回路を簡略化して示す接続図であり、従来技
術と同じ構成部分には同一参照符号を付すことにより、
重複した説明を省略する。図において、スイッチングレ
ギュレ−タの基本回路としてのＤＣ−ＤＣコンバ−タ回
路１は、パルストランス３，半導体スイッチ２，からな
るインバ−タ部と、パルストランス３の二次巻線に接続
された整流ダイオ−ド４，出力リアクトル６，およびコ
ンデンサ７からなりる整流平滑回路と、帰還ダイオ−ド
５とで構成される。また、ＤＣ−ＤＣコンバ−タ回路１
の出力側にはダミ−負荷抵抗９が接続される。EXAMPLES The present invention will be described below based on examples. FIG. 1 is a connection diagram showing a simplified main circuit of a switching regulator according to an embodiment of the present invention. By assigning the same reference numerals to the same components as those of the prior art,
A duplicate description will be omitted. In the figure, a DC-DC converter circuit 1 as a basic circuit of a switching regulator is connected to an inverter section composed of a pulse transformer 3, a semiconductor switch 2 and a secondary winding of the pulse transformer 3. It is composed of a rectifying / smoothing circuit composed of a rectifying diode 4, an output reactor 6, and a capacitor 7, and a feedback diode 5. In addition, the DC-DC converter circuit 1
A dummy load resistor 9 is connected to the output side of the.
【００１３】一方、ＤＣ−ＤＣコンバ−タ回路の出力電
流を検出し、その検出電流値が予め定まる電流値を越え
たときダミ−負荷抵抗に流れる電流を遮断するダミ−負
荷電流の制御手段１１は、ＤＣ−ＤＣコンバ−タ回路１
の出力電流を検出する電流検出器１２と、ダミ−負荷抵
抗９に直列接続され電流検出器１２の検出電流値が予め
定まる電流値を越えたときダミ−負荷抵抗９に流れる電
流を遮断する半導体スイッチ１３とで構成され、ＤＣ−
ＤＣコンバ−タ回路１の出力電流Ｉ2 を例えばシャント
抵抗分流器，カレントトランスなどの電流検出器１２で
検出し、検出電流値が例えば定挌電流の３０％に相当す
るレベルを越えたとき、半導体スイッチ１３を動作させ
ることにより、定挌電流の３０％以下の軽負荷領域では
出力電流ｉ2 の脈動率の上昇やオンオフ周期Ｔの不安定
化などを阻止して出力を安定化できる。また、定挌電流
の３０％を越える通常運転領域では定挌電流の１０〜２
０％に相当する余分な電流がダミ−負荷９に無駄に流れ
ることを阻止できるので、従来技術で問題になったスイ
ッチングレギュレ−タの出力の増大やこれに起因するス
イッチングレギュレ−タの大型化，あるいはダミ−負荷
の発生損失に起因するスイッチングレギュレ−タの電力
変換効率が低下などを回避することができる。さらに、
出力リアクトルのインダクタンスＬを増して脈動率μの
増大を抑制する必要も無くなるので、これが原因でリア
クトルが大型化するという問題も回避することができ
る。On the other hand, the dummy load current control means 11 which detects the output current of the DC-DC converter circuit and shuts off the current flowing through the dummy load resistor when the detected current value exceeds a predetermined current value. Is a DC-DC converter circuit 1
Of a current detector 12 for detecting the output current of the current detector and a semiconductor connected in series with the dummy load resistor 9 and cutting off the current flowing through the dummy load resistor 9 when the detected current value of the current detector 12 exceeds a predetermined current value. The switch 13 and DC-
When the output current I 2 of the DC converter circuit 1 is detected by a current detector 12 such as a shunt resistance shunt or a current transformer, and the detected current value exceeds a level corresponding to 30% of the constant depletion current, By operating the semiconductor switch 13, it is possible to prevent the rise of the pulsation rate of the output current i 2 and the destabilization of the on / off cycle T in the light load region of 30% or less of the constant deceleration current to stabilize the output. Further, in a normal operation region in which the constant destructive current exceeds 30%, the constant destructive current is 10-2.
Since it is possible to prevent unnecessary current equivalent to 0% from flowing unnecessarily to the dummy load 9, an increase in the output of the switching regulator, which has been a problem in the prior art, and an increase in the size of the switching regulator due to this increase. Alternatively, it is possible to avoid a decrease in the power conversion efficiency of the switching regulator due to the loss generated by the dummy load. further,
Since there is no need to increase the inductance L of the output reactor to suppress the increase of the pulsation rate μ, it is possible to avoid the problem that the reactor becomes large due to this.
【００１４】図２はこの発明の異なる実施例を示すスイ
ッチングレギュレ−タの主回路を簡略化して示す接続図
であり、ダミ−負荷電流の制御手段２１が、ＤＣ−ＤＣ
コンバ−タ回路１の出力電流Ｉ2 をその出力リアクトル
６の抵抗電圧降下として検出する差動増幅回路２２と、
ダミ−負荷抵抗９に直列接続され差動増幅回路２２の検
出電圧値が予め定まる電圧値を越えたときダミ−負荷抵
抗９に流れる電流を遮断する半導体スイッチとで構成さ
れた点が前述の実施例と異なっており、半導体スイッチ
２のオンオフに同期してエネルギ−の蓄積と放出を行う
ことによりインダクタンス電圧降下の平均値が零となる
出力リアクトル６を電流検出器の一部に利用して、ＤＣ
−ＤＣコンバ−タ回路の出力電流をその出力リアクトル
６の抵抗電圧降下として検出することが可能となり、前
述の実施例で必要としたシャント抵抗分流器，あるいは
カレントトランス等の大型電気部品を排除できるので、
ダミ−負荷電流の制御手段２１の構成をより簡素化し、
その製造コストを低減できる利点が得られる。FIG. 2 is a connection diagram showing a simplified main circuit of a switching regulator showing a different embodiment of the present invention, in which the dummy load current control means 21 is a DC-DC.
A differential amplifier circuit 22 for detecting the output current I 2 of the converter circuit 1 as a resistance voltage drop of the output reactor 6;
The above-mentioned embodiment is constituted by a semiconductor switch which is connected in series to the dummy load resistor 9 and shuts off the current flowing through the dummy load resistor 9 when the detected voltage value of the differential amplifier circuit 22 exceeds a predetermined voltage value. Different from the example, the output reactor 6 in which the average value of the inductance voltage drop becomes zero by storing and releasing energy in synchronism with ON / OFF of the semiconductor switch 2 is used as a part of the current detector, DC
It becomes possible to detect the output current of the DC converter circuit as a resistance voltage drop of the output reactor 6, and it is possible to eliminate the large electrical parts such as the shunt resistance shunt or the current transformer required in the above-mentioned embodiment. So
The configuration of the dummy load current control means 21 is further simplified,
There is an advantage that the manufacturing cost can be reduced.
【００１５】[0015]
【発明の効果】この発明は前述のように、ＤＣ−ＤＣコ
ンバ−タ回路の出力側に接続されたダミ−負荷抵抗を備
えたスイッチングレギュレ−タにおいて、ＤＣ−ＤＣコ
ンバ−タ回路の出力電流を検出し、その検出電流値が予
め定まる電流値を越えたときダミ−負荷抵抗に流れる電
流を遮断するダミ−負荷電流の制御手段を設けるよう構
成した。その結果、ダミ−負荷に常時電流を流す従来の
技術で問題となったスイッチングレギュレ−タや出力リ
アクトルの大型化，電力変換効率の低下などの問題点が
排除され、軽負荷領域でも制御の安定性に優れ、小型で
電力変換効率が高いスイッチングレギュレ−タを提供す
ることができる。As described above, according to the present invention, in the switching regulator having the dummy load resistance connected to the output side of the DC-DC converter circuit, the output current of the DC-DC converter circuit is increased. Is provided, and a control means for the dummy load current is provided so as to interrupt the current flowing through the dummy load resistance when the detected current value exceeds a predetermined current value. As a result, the problems such as the large size of the switching regulator and output reactor and the reduction of power conversion efficiency, which were problems in the conventional technology of always flowing the current to the dummy load, are eliminated, and the control is stable even in the light load region. It is possible to provide a switching regulator that is excellent in performance, is small, and has high power conversion efficiency.
【００１６】ことに、ダミ−負荷電流の制御手段を、Ｄ
Ｃ−ＤＣコンバ−タ回路の出力電流をその出力リアクト
ルの抵抗電圧降下として検出する差動増幅回路と、ダミ
−負荷抵抗に直列接続され差動増幅回路の検出電圧値が
予め定まる電圧値を越えたときダミ−負荷抵抗に流れる
電流を遮断する半導体スイッチとで構成すれば、出力リ
アクトルを電流検出器の一部に利用してダミ−負荷電流
の制御手段の構成をより簡素化し、その製造コストを低
減できるできるので、軽負荷領域でも制御の安定性に優
れ、小型で電力変換効率が高いスイッチングレギュレ−
タを経済的にも有利に提供することができる。In particular, the dummy load current control means D
A differential amplifier circuit that detects the output current of the C-DC converter circuit as a resistance voltage drop of its output reactor, and a detection voltage value of the differential amplifier circuit that is connected in series with a dummy load resistor exceeds a predetermined voltage value. If it is configured with a semiconductor switch that cuts off the current flowing in the dummy load resistance, the output reactor is used as a part of the current detector to further simplify the configuration of the dummy load current control means and reduce its manufacturing cost. Since it is possible to reduce the power consumption, the switching regulation is excellent in the control stability even in the light load area, and it is small and has high power conversion efficiency
Can be provided economically as well.
【図１】この発明の実施例になるスイッチングレギュレ
−タの主回路を簡略化して示す接続図FIG. 1 is a connection diagram showing a simplified main circuit of a switching regulator according to an embodiment of the present invention.
【図２】この発明の異なる実施例を示すスイッチングレ
ギュレ−タの主回路を簡略化して示す接続図FIG. 2 is a connection diagram showing a simplified main circuit of a switching regulator showing a different embodiment of the present invention.
【図３】従来のスイッチングレギュレ−タの基本回路を
簡略化して示す接続図FIG. 3 is a connection diagram showing a simplified basic circuit of a conventional switching regulator.
【図４】図３のように構成された従来のスイッチングレ
ギュレ−タの基本回路の動作を示す波形図FIG. 4 is a waveform diagram showing the operation of the basic circuit of the conventional switching regulator configured as shown in FIG.
１ ＤＣ−ＤＣコンバ−タ回路 ２ 半導体スイッチ ３ パルストランス ４ 整流ダイオ−ド ５ 帰還ダイオ−ド ６ 出力リアクトル ７ コンデンサ ８ 制御回路 ９ ダミ−負荷抵抗 １０ 外部負荷 １１ ダミ−負荷電流の制御手段 １２ 電流検出器 １３ 半導体スイッチ ２１ ダミ−負荷電流の制御手段 ２２ 差動増幅回路（電流検出器） ２３ 半導体スイッチ DESCRIPTION OF SYMBOLS 1 DC-DC converter circuit 2 Semiconductor switch 3 Pulse transformer 4 Rectification diode 5 Feedback diode 6 Output reactor 7 Capacitor 8 Control circuit 9 Damper load resistor 10 External load 11 Damper load current control means 12 Current Detector 13 Semiconductor switch 21 Dummy load current control means 22 Differential amplifier circuit (current detector) 23 Semiconductor switch
Claims (3)
合を制御することにより直流入力電圧を任意の直流電圧
に変換して外部負荷に供給するＤＣ−ＤＣコンバ−タ回
路と、その出力側に接続されたダミ−負荷抵抗とを備え
たものにおいて、前記ＤＣ−ＤＣコンバ−タ回路の出力
電流を検出し、その検出電流値が予め定まる電流値を越
えたとき前記ダミ−負荷抵抗に流れる電流を遮断するダ
ミ−負荷電流の制御手段を備えてなることを特徴とする
スイッチングレギュレ−タ。1. A DC-DC converter circuit for converting a direct-current input voltage into an arbitrary direct-current voltage and supplying it to an external load by controlling a ratio of on-time and off-time of a semiconductor switch, and an output side thereof. A connected dummy load resistor, the output current of the DC-DC converter circuit is detected, and the current flowing through the dummy load resistor when the detected current value exceeds a predetermined current value. A switching regulator comprising a dummy load current control means for shutting off the load.
ンバ−タ回路の出力電流を検出する電流検出器と、ダミ
−負荷抵抗に直列接続され前記電流検出器の検出電流値
が予め定まる電流値を越えたときダミ−負荷抵抗に流れ
る電流を遮断する半導体スイッチとからなることを特徴
とする請求項１記載のスイッチングレギュレ−タ。2. A current detector for detecting an output current of a DC-DC converter circuit by means of a dummy load current control means and a current detector connected in series with a dummy load resistor to preset a detected current value of said current detector. 2. A switching regulator according to claim 1, comprising a semiconductor switch for interrupting a current flowing through the dummy load resistance when the current value is exceeded.
ンバ−タ回路の出力電流をその出力リアクトルの抵抗電
圧降下として検出する差動増幅回路と、ダミ−負荷抵抗
に直列接続され前記差動増幅回路の検出電圧値が予め定
まる電圧値を越えたときダミ−負荷抵抗に流れる電流を
遮断する半導体スイッチとからなることを特徴とする請
求項１記載のスイッチングレギュレ−タ。3. A differential amplifier circuit for detecting the output current of a DC-DC converter circuit as a resistance voltage drop of its output reactor, and a differential load circuit connected in series to the dummy load resistance. 2. The switching regulator according to claim 1, further comprising a semiconductor switch that interrupts a current flowing through the dummy load resistor when the detected voltage value of the dynamic amplifier circuit exceeds a predetermined voltage value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12640493A JPH06339265A (en) | 1993-05-28 | 1993-05-28 | Switching regulator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12640493A JPH06339265A (en) | 1993-05-28 | 1993-05-28 | Switching regulator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH06339265A true JPH06339265A (en) | 1994-12-06 |
Family
ID=14934321
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12640493A Pending JPH06339265A (en) | 1993-05-28 | 1993-05-28 | Switching regulator |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH06339265A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2000038304A1 (en) * | 1998-12-18 | 2000-06-29 | Koninklijke Philips Electronics N.V. | Switched-mode power supply with a dummy load |
| CN103036425A (en) * | 2012-12-14 | 2013-04-10 | 大连海事大学 | Direct current (DC)-DC convertor dead load |
-
1993
- 1993-05-28 JP JP12640493A patent/JPH06339265A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2000038304A1 (en) * | 1998-12-18 | 2000-06-29 | Koninklijke Philips Electronics N.V. | Switched-mode power supply with a dummy load |
| CN103036425A (en) * | 2012-12-14 | 2013-04-10 | 大连海事大学 | Direct current (DC)-DC convertor dead load |
| CN103036425B (en) * | 2012-12-14 | 2015-10-28 | 大连海事大学 | The dead load of a kind of DC-DC converter |
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