JPH0919143A - Multioutput switching regulator - Google Patents

Multioutput switching regulator

Info

Publication number
JPH0919143A
JPH0919143A JP16510195A JP16510195A JPH0919143A JP H0919143 A JPH0919143 A JP H0919143A JP 16510195 A JP16510195 A JP 16510195A JP 16510195 A JP16510195 A JP 16510195A JP H0919143 A JPH0919143 A JP H0919143A
Authority
JP
Japan
Prior art keywords
voltage
circuit
control
terminal
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
Application number
JP16510195A
Other languages
Japanese (ja)
Other versions
JP3015911B2 (en
Inventor
Kiyoharu Inao
清春 稲生
Akira Uchida
暁 内田
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.)
Yokogawa Electric Corp
Original Assignee
Yokogawa 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 Yokogawa Electric Corp filed Critical Yokogawa Electric Corp
Priority to JP7165101A priority Critical patent/JP3015911B2/en
Publication of JPH0919143A publication Critical patent/JPH0919143A/en
Application granted granted Critical
Publication of JP3015911B2 publication Critical patent/JP3015911B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Abstract

PURPOSE: To provide a multioutput power supply in which the low voltage output can be controlled stably with high accuracy using a three terminal PWM control IC having high lower limit of control input voltage. CONSTITUTION: The multioutput power supply comprises a primary circuit having a primary winding Np being applied with a DC voltage Vin, a main output circuit for rectifying and smoothing a switching signal induced in a secondary winding NS to supply a main output voltage Vout1, a suboutput circuit for rectifying and smoothing a switching signal induced in an auxiliary winding NB to supply a suboutput voltage Vout2, and a three terminal control circuit 10 receiving a control current Ictrl from the suboutput circuit at the control terminal thereof and turning the current flowing through the primary winding on/off to stabilize the suboutput voltage. The multioutput power supply further comprises an error amplifier 20 receiving the main output voltage at the input terminal thereof and outputting a comparison signal, and a current control section 30 receiving the comparison signal at the control terminal thereof and delivering a current from the suboutput circuit, as a control current, to the control terminal of three terminal control circuit.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は多出力スイッチング電源
装置における出力電圧の安定化に掛り、特に低電圧出力
に高い精度が必要な場合であって、制御回路の制御入力
に必要とされる入力電圧が当該低電圧出力よりも高い場
合の低電圧出力安定化の改良に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to stabilization of output voltage in a multi-output switching power supply device, and particularly when low voltage output requires high accuracy, input required for control input of control circuit. It relates to an improvement of low voltage output stabilization when the voltage is higher than the low voltage output.

【0002】[0002]

【従来の技術】多出力スイッチング電源装置において
は、本出願人の提案にかかる特開平2−307363号
公報に開示されているように、主出力電圧の安定化はP
WM制御回路による負帰還回路により行い、従出力電圧
については主出力電圧の安定化に依存して行うものが知
られている。主出力電圧については負荷電流や入力電圧
の変動に対して概ね5%以内の高精度な安定化が行われ
ており、他方従出力電圧については概ね10〜20%以
内の通常精度の安定化が行われている。
2. Description of the Related Art In a multi-output switching power supply device, as disclosed in Japanese Patent Application Laid-Open No. 2-307363 proposed by the present applicant, stabilization of the main output voltage is P
It is known that a negative feedback circuit by a WM control circuit is used, and a secondary output voltage is dependent on stabilization of a main output voltage. The main output voltage is highly accurately stabilized within 5% with respect to fluctuations in load current and input voltage, while the secondary output voltage is stabilized within 10 to 20% in normal accuracy. Has been done.

【0003】ところで、電源の小型化のためにPWM制
御回路、定電圧回路Vr1並びにスイッチング素子Qを一
体化した3端子のFET内蔵PWM制御電源用ICを採
用することがある(例えば、日経エレクトロニクス第6
20号104頁参照)。図3はこのような3端子制御回
路の動作を説明する図で、横軸は制御電流Ictrl、縦軸
はデューティー比を表している。制御電流Ictrlが0か
らI1までは、デューティー比はDMAXに設定されてい
る。そして、制御電流IctrlがI1からI2までは、この
制御電流Ictrlに比例してデューティー比がDMAXから
MINまで減少する。さらに、制御電流IctrlがI2を超
えると、デューティー比がDMINに設定される。
By the way, in order to miniaturize the power supply, a PWM control circuit, a constant voltage circuit V r1 and a switching element Q, which are integrated with each other, may be used as a 3-terminal FET built-in PWM control power supply IC (for example, Nikkei Electronics). Sixth
No. 20, page 104). FIG. 3 is a diagram for explaining the operation of such a three-terminal control circuit, in which the horizontal axis represents the control current Ictrl and the vertical axis represents the duty ratio. The duty ratio is set to D MAX when the control current Ictrl is from 0 to I 1 . Then, when the control current Ictrl is from I 1 to I 2 , the duty ratio is decreased from D MAX to D MIN in proportion to the control current Ictrl. Further, when the control current Ictrl exceeds I 2 , the duty ratio is set to D MIN .

【0004】ところで、この制御端子電圧Vctrlは、I
C内部の定電圧回路により5.7Vと定められている。従
って、制御電流Ictrlを供給する出力の電圧は5.7V以
上必要となる。そこで、例えば論理素子用の高精度の低
電圧5Vと、OPアンプ等の動作用電源であり低い精度
で足りる高電圧15Vの出力を有する多出力DC電源に
おいては、この3端子制御回路を低電圧出力の安定化に
利用できない。
By the way, the control terminal voltage Vctrl is I
It is determined to be 5.7V by the constant voltage circuit inside C. Therefore, the output voltage for supplying the control current Ictrl needs to be 5.7 V or higher. Therefore, for example, in a multi-output DC power supply having a high-accuracy low voltage of 5V for a logic element and an operation power supply of an OP amplifier or the like, which has a high voltage of 15V, which is sufficient with a low accuracy, this three-terminal control circuit is used as a low voltage Not available for output stabilization.

【0005】そこで、図4に3端子制御回路を用いて高
電圧出力の安定化をする装置の回路図を示す。ここで
は、一次側のコモンと二次側のコモンを共通に接続する
場合を示している。図において、直流電圧Vinは、商用
電源等のAC入力電圧をダイオードブリッジ回路等の整
流回路で整流し、平滑コンデンサ等の平滑化回路で平滑
化されたものや、バッテリ等の直流電圧源から供給され
るものである。この直流電圧Vinは入力コンデンサCin
を介してトランスの一次巻線Npに印加され、FET等
のスイッチング素子Qによってオンオフされている。す
るとトランスの二次巻線Nsにはスイッチング信号が誘
起されるので、ダイオードD1とコンデンサC1の整流
平滑化回路で直流化し、主出力電圧Vout1を負荷に供給
している。ここで、主出力電圧Vout1は高精度の低電圧
出力とする。
Therefore, FIG. 4 shows a circuit diagram of an apparatus for stabilizing a high voltage output by using a three-terminal control circuit. Here, the case where the common on the primary side and the common on the secondary side are connected in common is shown. In the figure, the DC voltage Vin is supplied from an AC input voltage such as a commercial power source rectified by a rectifying circuit such as a diode bridge circuit and smoothed by a smoothing circuit such as a smoothing capacitor, or a DC voltage source such as a battery. It is what is done. This DC voltage Vin is input capacitor Cin
Is applied to the primary winding Np of the transformer via a switch and is turned on / off by a switching element Q such as an FET. Then, a switching signal is induced in the secondary winding Ns of the transformer, so that the rectifying / smoothing circuit of the diode D1 and the capacitor C1 converts it into a direct current and supplies the main output voltage Vout1 to the load. Here, the main output voltage Vout1 is a highly accurate low voltage output.

【0006】またトランスの補助巻線NBにもスイッチ
ング信号が誘起されるので、ダイオードD2とコンデン
サC2の整流平滑化回路で直流化し、従出力電圧Vout2
を生成する。また、ゼナーダイオードDZ3のカソード端
子は従出力電圧Vout2と接続され、アノード端子はコン
デンサC3並びにPWM制御回路の制御入力端子に接続
されている。また、従出力電圧Vout2は精度をそれほど
必要としない高電圧出力とする。なお、図中、一次巻線
Np、二次巻線Ns及び補助巻線NBに付された黒丸●は
巻線の開始部位を表している。
Further, since a switching signal is also induced in the auxiliary winding N B of the transformer, it is converted into a direct current by the rectifying and smoothing circuit of the diode D2 and the capacitor C2, and the secondary output voltage Vout2
Generate The cathode terminal of the Zener diode D Z3 is connected to the secondary output voltage Vout2, and the anode terminal is connected to the capacitor C3 and the control input terminal of the PWM control circuit. The secondary output voltage Vout2 is a high voltage output that does not require high accuracy. In the figure, the black circles ● attached to the primary winding Np, the secondary winding Ns, and the auxiliary winding N B represent the starting portions of the windings.

【0007】PWM制御回路は、定電圧回路Vr1と制御
入力端子に入力される制御電流Ictrlを用いて、スイッ
チング素子Qに送るオンオフ制御信号を生成するもの
で、上述の3端子制御回路を用いる。ここでは、補助巻
線NBの従出力電圧Vout2の安定化はPWM制御回路に
よる負帰還回路により行い、主出力電圧については補助
巻線NBと二次巻線Nsが同一トランスに巻装されている
ことによって、上記負帰還回路によって副次的に安定化
されている。
The PWM control circuit uses the constant voltage circuit V r1 and the control current Ictrl input to the control input terminal to generate an on / off control signal to be sent to the switching element Q, and uses the above-mentioned three-terminal control circuit. . Here, the secondary output voltage Vout2 of the auxiliary winding N B is stabilized by a negative feedback circuit by a PWM control circuit, and for the main output voltage, the auxiliary winding N B and the secondary winding Ns are wound on the same transformer. As a result, the negative feedback circuit stabilizes it secondarily.

【0008】[0008]

【発明が解決しようとする課題】しかし、このような3
端子制御回路を用いて従出力電圧Vout2を安定化したの
では、本来高精度が必要とされる主電圧出力について、
出力電圧の安定化が同一トランスに巻装されていること
のみに依存するため、必要な電圧精度が確保できないと
いう課題があった。また、従出力電圧Vout2について
も、3端子制御回路に定電圧回路Vr1が予め内蔵されて
いると共に、3端子化されているから調整用の端子も設
けられていないため、ICの製造上のバラツキが電圧の
安定化にそのまま影響を及ぼすと共に、ゼナーダイオー
ドDZ3を介して制御電流Ictrlを送っているので、素子
のバラツキの影響が重畳して、精度がさほど上がらない
という課題があった。
However, such a 3
The secondary output voltage Vout2 is stabilized by using the terminal control circuit.
Since the stabilization of the output voltage depends only on the fact that the output voltage is wound around the same transformer, there is a problem in that the required voltage accuracy cannot be ensured. Regarding the secondary output voltage Vout2, the constant voltage circuit V r1 is built in the three-terminal control circuit in advance, and since it has three terminals, no adjustment terminal is provided. Since the variation directly affects the stabilization of the voltage and the control current Ictrl is sent through the Zener diode D Z3 , there is a problem that the influence of the variation of the element is superimposed and the accuracy is not so improved. .

【0009】本発明はこのような課題を解決したもの
で、制御入力電圧の最低限電圧が高いため、高精度の必
要な低電圧出力を直接安定化できない3端子化されたP
WM制御用ICを用いた電源であっても、この低電圧出
力を高精度で安定に制御できる多出力スイッチングレギ
ュレータを提供することを目的とする。
The present invention has solved such a problem, and since the minimum voltage of the control input voltage is high, a P-terminal having three terminals cannot directly stabilize a low-voltage output that requires high precision.
It is an object of the present invention to provide a multi-output switching regulator that can control this low voltage output with high accuracy and stability even with a power supply using a WM control IC.

【0010】[0010]

【課題を解決するための手段】上記の目的を達成する本
発明は、直流電圧Vinが印加される一次巻線Npを有す
る一次側回路と、二次巻線Nsに誘起されるスイッチン
グ信号を整流平滑して主出力電圧Vout1を供給する主出
力回路と、補助巻線NBに誘起されるスイッチング信号
を整流平滑して従出力電圧Vout2を供給する従出力回路
と、この従出力回路からの制御電流Ictrlを制御端子に
入力し、内蔵した定電圧回路の定電圧V r1を用いて、前
記従出力電圧を安定化するように前記一次巻線に流れる
電流をオンオフする3端子制御回路10とを有し、前記
一次側回路、主出力回路及び従出力回路のコモンを共通
とし、前記従出力電圧は高電圧、前記主出力電圧は低電
圧出力とすると共に、当該主出力電圧の出力電圧は前記
3端子制御回路の制御端子入力電圧の最低入力電圧に比
べて低い多出力スイッチングレギュレータにおいて、次
の構成としたものである。
[Means for Solving the Problems] A book that achieves the above object.
The invention has a primary winding Np to which a DC voltage Vin is applied.
Switch circuit induced in the primary side circuit and the secondary winding Ns
The main output that supplies the main output voltage Vout1 by rectifying and smoothing the input signal.
Power circuit and auxiliary winding NBSwitching signal induced in
Output circuit that rectifies and smoothes the output and supplies the output voltage Vout2
And the control current Ictrl from this secondary output circuit to the control terminal
Input the constant voltage V of the built-in constant voltage circuit r1Using
It flows in the primary winding so as to stabilize the secondary output voltage.
A three-terminal control circuit 10 for turning on / off a current,
Common for primary side circuit, main output circuit, and sub output circuit
The secondary output voltage is a high voltage and the main output voltage is a low voltage.
In addition to the pressure output, the output voltage of the main output voltage is
Compared to the minimum input voltage of the control terminal input voltage of the 3-terminal control circuit
For all low-output switching regulators,
The configuration is as follows.

【0011】即ち、前記主出力電圧を入力端子に入力し
て基準電圧Vr2と比較して、出力端子から出力される比
較信号を出力する誤差アンプ20と、この誤差アンプの
出力する比較信号を制御端子に入力し、前記従出力回路
から送られる電流を入力して、前記制御電流として3端
子制御回路の制御端子に送る電流制御部30とを具備す
ることを特徴としている。
That is, the main output voltage is input to the input terminal and compared with the reference voltage Vr 2, and the error amplifier 20 for outputting the comparison signal output from the output terminal and the comparison signal output by this error amplifier are compared. It is characterized by comprising a current control unit 30 which inputs to the control terminal, inputs the current sent from the slave output circuit, and sends it as the control current to the control terminal of the three-terminal control circuit.

【0012】[0012]

【作用】本発明の構成によれば、高精度が必要とされる
主出力回路の主出力電圧は、誤差アンプを用いて電流制
御部から3端子制御回路に送られる制御電流を制御し、
負帰還制御ループにより安定化されるので、必要な精度
を確保できる。この制御電流には所定電圧以上の高電圧
が必要なので、従出力回路から電流制御部に従出力電圧
を供給している。従出力電圧の安定化については、二次
巻線と補助巻線が同一トランスに巻装されているから、
主出力電圧の安定化に随伴して行えば足りる。
According to the structure of the present invention, the main output voltage of the main output circuit, which requires high accuracy, controls the control current sent from the current control unit to the three-terminal control circuit by using the error amplifier,
Since it is stabilized by the negative feedback control loop, the required accuracy can be secured. Since this control current requires a high voltage equal to or higher than a predetermined voltage, the secondary output circuit supplies the secondary output voltage from the current controller. Regarding the stabilization of the secondary output voltage, the secondary winding and the auxiliary winding are wound on the same transformer,
It suffices to go along with stabilizing the main output voltage.

【0013】[0013]

【実施例】以下図面を用いて、本発明を説明する。図1
は本発明の一実施例を示す回路図である。尚、図1にお
いて前記図4と同一作用をするものには同一符号を付し
て説明を省略する。ここでは、主出力電圧Vout1の安定
化のために、分圧抵抗R1,R2で主出力電圧Vout1を
分圧し、誤差アンプ20の入力端子に入力する。誤差ア
ンプ20にTL431等のシャントレギュレータを用い
る場合には、入力端子はリファレンス端子、出力端子は
カソード端子、基準電位を定めるコモン端子はアノード
端子と呼ばれており、リファレンス端子に入力された電
圧に応じた電流がカソード端子より出力される。誤差ア
ンプ20のコモン端子は二次巻線Nsのコモン側と接続
され、出力端子はトランジスタ30のベース端子に接続
されている。そして、誤差アンプ20は入力端子の入力
電圧と基準電圧Vr2とを比較して、比較信号をカソード
端子に出力している。この基準電圧Vr2は、TL431
の場合には2.495Vに選定されている。
DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. FIG.
FIG. 3 is a circuit diagram showing an embodiment of the present invention. In FIG. 1, components having the same functions as those in FIG. Here, in order to stabilize the main output voltage Vout1, the main output voltage Vout1 is divided by the voltage dividing resistors R1 and R2 and input to the input terminal of the error amplifier 20. When a shunt regulator such as TL431 is used for the error amplifier 20, the input terminal is called the reference terminal, the output terminal is called the cathode terminal, and the common terminal that determines the reference potential is called the anode terminal. A corresponding current is output from the cathode terminal. The common terminal of the error amplifier 20 is connected to the common side of the secondary winding Ns, and the output terminal is connected to the base terminal of the transistor 30. Then, the error amplifier 20 compares the input voltage of the input terminal with the reference voltage Vr 2 and outputs a comparison signal to the cathode terminal. This reference voltage Vr 2 is TL431.
In the case of, it is selected as 2.495V.

【0014】電流制御部30は、ここではトランジスタ
TrとコンデンサC3よりなる。トランジスタとしては
PNP形を用いており、エミッタ端子には従出力電圧V
out2が供給され、ゲート端子には誤差アンプ20の出力
端子が接続され、コレクタ端子はコンデンサC3を介し
てコモンに接続されると共に、3端子制御回路10の制
御入力端子と接続されている。
The current control section 30 comprises a transistor Tr and a capacitor C3 here. A PNP type transistor is used as the transistor, and the secondary output voltage V is applied to the emitter terminal.
out2 is supplied, the output terminal of the error amplifier 20 is connected to the gate terminal, the collector terminal is connected to the common via the capacitor C3, and the control input terminal of the three-terminal control circuit 10 is connected.

【0015】このように構成された装置において、出力
電圧の安定化は次のように行われる。まず主出力回路の
主出力電圧Vout1の安定化は、誤差アンプ20のカソー
ド電流を用いて電流制御部30が3端子制御回路10に
送る制御電流Ictrlを制御している。これにより、主出
力電圧Vout1の分圧された電圧が基準電圧Vr2と一致す
るように、3端子制御回路10が一次巻線Npに流れる
パルス電流のデューティー比を制御している。
In the device constructed as described above, the output voltage is stabilized as follows. First, in order to stabilize the main output voltage Vout1 of the main output circuit, the cathode current of the error amplifier 20 is used to control the control current Ictrl sent from the current control unit 30 to the three-terminal control circuit 10. Accordingly, as the divided voltage of the main output voltage Vout1 is coincident with the reference voltage Vr 2, 3 terminal control circuit 10 controls the duty ratio of the pulse current flowing through the primary winding Np.

【0016】次に、従出力回路の従出力電圧Vout2の安
定化は、二次巻線Nsと補助巻線NBが同一トランスに巻
装されているから、主出力電圧の安定化に随伴して行な
われる。従出力電圧Vout2は、3端子制御回路10の制
御端子に対する入力電圧Vctrlの規格に比べて高いの
で、電流制御部30のトランジスタを介して当該制御端
子の制御電流Ictrlとしての適格を有している。
Next, stabilization of the secondary output voltage Vout2 of the secondary output circuit, since the secondary winding Ns and the auxiliary winding N B is wound on the same transformer and associated to the stabilization of the main output voltage Will be performed. Since the secondary output voltage Vout2 is higher than the standard of the input voltage Vctrl for the control terminal of the three-terminal control circuit 10, it is suitable as the control current Ictrl of the control terminal via the transistor of the current control unit 30. .

【0017】図2は本発明の他の実施例を示す回路図で
ある。こごては、電流制御部30としてフォトカプラP
Cを用いており、発光ダイオードのアノード端子は従出
力回路の従出力電圧Vout2と接続され、カソード端子は
誤差アンプ20の出力端子が接続されている。また受光
トランジスタは、コレクタ端子が従出力回路の従出力電
圧Vout2と接続され、エミッタ端子がコンデンサC3を
介してコモンに接続されていると共に、3端子制御回路
10の制御端子に接続されている。このような構成よっ
ても、誤差アンプ20の出力電流によって、制御電流I
ctrlが制御され、主出力回路の主出力電圧Vout1が安定
化される。
FIG. 2 is a circuit diagram showing another embodiment of the present invention. The iron is a photo coupler P as the current control unit 30.
C is used, the anode terminal of the light emitting diode is connected to the sub output voltage Vout2 of the sub output circuit, and the cathode terminal is connected to the output terminal of the error amplifier 20. Further, the light receiving transistor has a collector terminal connected to the sub output voltage Vout2 of the sub output circuit, an emitter terminal connected to the common via the capacitor C3, and a control terminal of the three-terminal control circuit 10. Even with this configuration, the output current of the error amplifier 20 causes the control current I
ctrl is controlled and the main output voltage Vout1 of the main output circuit is stabilized.

【0018】なお、出力電圧の大きな従出力回路から制
御電流Ictrlを供給し、誤差アンプ20の出力電流は電
流制御部30の制御入力として用いられているだけなの
で、少なくてすむ。すると主出力電圧Vout1のAC的な
変動に対する、誤差アンプ20の出力電流のAC的な変
動が従出力回路の出力電流に比較して小さくて済む。即
ち、制御ループのゲインが相対的に低くなり、制御ルー
プの位相余裕により発振が抑制される。従って、主従の
出力電圧が安定化される。
The control current Ictrl is supplied from the secondary output circuit having a large output voltage, and the output current of the error amplifier 20 is used only as the control input of the current control section 30, so that it can be kept small. Then, the AC fluctuation of the output current of the error amplifier 20 with respect to the AC fluctuation of the main output voltage Vout1 can be smaller than the output current of the slave output circuit. That is, the gain of the control loop becomes relatively low, and oscillation is suppressed by the phase margin of the control loop. Therefore, the master-slave output voltage is stabilized.

【0019】[0019]

【発明の効果】以上説明したように、本発明によれば、
3端子制御回路の制御端子の最低入力電圧が低電圧側の
出力電圧に比べて高くても、この低電圧側の出力電圧を
制御入力とし、電力は高電圧側である従出力回路から供
給される電流制御部30により、この制御端子に送る制
御電流Ictrlを定めているので、低電圧側の主出力電圧
が高い精度で安定化されるという効果がある。
As described above, according to the present invention,
Even if the lowest input voltage of the control terminal of the three-terminal control circuit is higher than the output voltage of the low voltage side, this low voltage side output voltage is used as the control input, and power is supplied from the high voltage side slave output circuit. Since the control current Ictrl to be sent to this control terminal is determined by the current control unit 30 according to the present invention, there is an effect that the main output voltage on the low voltage side is stabilized with high accuracy.

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

【図1】本発明の一実施例を示す回路図である。FIG. 1 is a circuit diagram showing one embodiment of the present invention.

【図2】本発明の他の実施例を示す回路図である。FIG. 2 is a circuit diagram showing another embodiment of the present invention.

【図3】3端子制御回路の動作を説明する図である。FIG. 3 is a diagram illustrating an operation of a three-terminal control circuit.

【図4】3端子制御回路を用いて高電圧出力の安定化を
する装置の回路図である。
FIG. 4 is a circuit diagram of a device for stabilizing a high voltage output by using a three-terminal control circuit.

【符号の説明】[Explanation of symbols]

10 3端子制御回路 20 誤差アンプ 30 電流制御部 Np 一次巻線 Ns 二次巻線 NB 補助巻線10 3 terminal control circuit 20 Error amplifier 30 Current control unit Np Primary winding Ns Secondary winding N B Auxiliary winding

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】直流電圧(Vin)が印加される一次巻線
(Np)を有する一次側回路と、二次巻線(Ns)に誘起
されるスイッチング信号を整流平滑して主出力電圧(V
out1)を供給する主出力回路と、補助巻線(NB)に誘
起されるスイッチング信号を整流平滑して従出力電圧
(Vout2)を供給する従出力回路と、この従出力回路か
らの制御電流(Ictrl)を制御端子に入力し、内蔵した
定電圧回路の定電圧(Vr 1)を用いて、前記従出力電圧
を安定化するように前記一次巻線に流れる電流をオンオ
フする3端子制御回路(10)とを有し、 前記一次側回路、主出力回路及び従出力回路のコモンを
共通とし、前記従出力電圧は高電圧、前記主出力電圧は
低電圧出力とすると共に、当該主出力電圧の出力電圧は
前記3端子制御回路の制御端子入力電圧の最低入力電圧
に比べて低い多出力スイッチングレギュレータにおい
て、 前記主出力電圧を入力端子に入力して基準電圧(Vr2
と比較して、出力端子から出力される比較信号を出力す
る誤差アンプ(20)と、 この誤差アンプの出力する比較信号を制御端子に入力
し、前記従出力回路から送られる電流を入力して、前記
制御電流として3端子制御回路の制御端子に送る電流制
御部(30)と、 を具備することを特徴とする多出力スイッチングレギュ
レータ。
1. A main output voltage (V) by rectifying and smoothing a switching signal induced in a primary side circuit having a primary winding (Np) to which a DC voltage (Vin) is applied and a secondary winding (Ns).
out1), a main output circuit for supplying the sub-output voltage (Vout2) by rectifying and smoothing the switching signal induced in the auxiliary winding (N B ), and a control current from the sub-output circuit. (Ictrl) is input to the control terminal, and the constant voltage (V r 1 ) of the built-in constant voltage circuit is used to turn on / off the current flowing through the primary winding so as to stabilize the secondary output voltage. A primary side circuit, a main output circuit, and a sub output circuit in common, the sub output voltage is a high voltage, and the main output voltage is a low voltage output. The output voltage of the voltage is lower than the minimum input voltage of the control terminal input voltage of the three-terminal control circuit. In the multi-output switching regulator, the main output voltage is input to the input terminal and the reference voltage (Vr 2 )
The error amplifier (20) that outputs the comparison signal output from the output terminal and the comparison signal output from the error amplifier are input to the control terminal, and the current sent from the slave output circuit is input. A multi-output switching regulator, comprising: a current control section (30) for sending the control current to a control terminal of a three-terminal control circuit.
JP7165101A 1995-06-30 1995-06-30 Multi-output switching regulator Expired - Lifetime JP3015911B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7165101A JP3015911B2 (en) 1995-06-30 1995-06-30 Multi-output switching regulator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7165101A JP3015911B2 (en) 1995-06-30 1995-06-30 Multi-output switching regulator

Publications (2)

Publication Number Publication Date
JPH0919143A true JPH0919143A (en) 1997-01-17
JP3015911B2 JP3015911B2 (en) 2000-03-06

Family

ID=15805918

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7165101A Expired - Lifetime JP3015911B2 (en) 1995-06-30 1995-06-30 Multi-output switching regulator

Country Status (1)

Country Link
JP (1) JP3015911B2 (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001086761A (en) * 1999-09-13 2001-03-30 Fuji Electric Co Ltd Protector for inverter
EP1146630A2 (en) * 2000-04-12 2001-10-17 Friwo Gerätebau Gmbh Method for regulating the output current and/or the output voltage of a switched mode power supply
KR100392911B1 (en) * 2001-05-26 2003-07-28 단암전자통신주식회사 Multiple output converter having cross regulation compensation circuit
JP2009268226A (en) * 2008-04-24 2009-11-12 Yokogawa Electric Corp Switching power supply
CN102142770A (en) * 2011-04-08 2011-08-03 上海交通大学 Series flyback switch power supply controlled by hysteresis loop
DE102018100709A1 (en) * 2018-01-15 2019-07-18 Infineon Technologies Austria Ag Power converter control, power converter and corresponding method

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001086761A (en) * 1999-09-13 2001-03-30 Fuji Electric Co Ltd Protector for inverter
EP1146630A2 (en) * 2000-04-12 2001-10-17 Friwo Gerätebau Gmbh Method for regulating the output current and/or the output voltage of a switched mode power supply
EP1146630A3 (en) * 2000-04-12 2002-07-17 Friwo Gerätebau Gmbh Method for regulating the output current and/or the output voltage of a switched mode power supply
EP1211794A2 (en) * 2000-12-04 2002-06-05 FRIWO Gerätebau GmbH Method for regulation of output current and/or output voltage of switched mode power supply
EP1211794A3 (en) * 2000-12-04 2002-11-13 FRIWO Gerätebau GmbH Method for regulation of output current and/or output voltage of switched mode power supply
KR100392911B1 (en) * 2001-05-26 2003-07-28 단암전자통신주식회사 Multiple output converter having cross regulation compensation circuit
JP2009268226A (en) * 2008-04-24 2009-11-12 Yokogawa Electric Corp Switching power supply
CN102142770A (en) * 2011-04-08 2011-08-03 上海交通大学 Series flyback switch power supply controlled by hysteresis loop
DE102018100709A1 (en) * 2018-01-15 2019-07-18 Infineon Technologies Austria Ag Power converter control, power converter and corresponding method
US10637359B2 (en) 2018-01-15 2020-04-28 Infineon Technologies Austria Ag Power converter controller, power converter, and corresponding methods

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