JPH0586146B2 - - Google Patents

Info

Publication number
JPH0586146B2
JPH0586146B2 JP8663388A JP8663388A JPH0586146B2 JP H0586146 B2 JPH0586146 B2 JP H0586146B2 JP 8663388 A JP8663388 A JP 8663388A JP 8663388 A JP8663388 A JP 8663388A JP H0586146 B2 JPH0586146 B2 JP H0586146B2
Authority
JP
Japan
Prior art keywords
voltage
output
circuit
converter device
prevention diode
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.)
Expired - Fee Related
Application number
JP8663388A
Other languages
Japanese (ja)
Other versions
JPH01259753A (en
Inventor
Koichi Kobayashi
Kenzo Kojima
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.)
Sanyo Electric Co Ltd
Original Assignee
Sanyo Electric Co Ltd
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 Sanyo Electric Co Ltd filed Critical Sanyo Electric Co Ltd
Priority to JP8663388A priority Critical patent/JPH01259753A/en
Publication of JPH01259753A publication Critical patent/JPH01259753A/en
Publication of JPH0586146B2 publication Critical patent/JPH0586146B2/ja
Granted legal-status Critical Current

Links

Landscapes

  • Dc-Dc Converters (AREA)

Description

【発明の詳細な説明】 (産業上の利用分野) 本発明はコンバータ装置に関するもので、詳し
くは出力に逆流防止用ダイオードを備えているコ
ンバータ装置の出力電圧の定電圧精度を高精度化
したコンバータ装置に関するものである。
DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a converter device, and more specifically, to a converter device that is equipped with a backflow prevention diode at the output and has a high precision constant voltage accuracy of the output voltage of the converter device. It is related to the device.

(従来技術及び発明が解決しようとする課題) 複数台のコンバータ装置を並行運転させること
によつて総合の給電可能な電力容量を増加した
り、予備のコンバータ装置を並行運転させて、電
源装置として信頼性を高ることが行われている。
(Prior art and problems to be solved by the invention) By operating multiple converter devices in parallel, the total power supply capacity can be increased, or by operating a spare converter device in parallel, it is possible to use it as a power supply device. Efforts are being made to improve reliability.

並行運転状態において1台のコンバータ装置の
2次回路の短絡障害が発生した時、他のコンバー
タ装置が共倒れする。これを防ぐ目的で、各々の
コンバータ装置の出力に逆流防止用ダイオードを
挿入する。この逆流防止用ダイオードにより障害
の起きたコンバータ装置に他のコンバータ装置あ
るいは出力に蓄電池が接続されている場合にはこ
の蓄電池からの電流の流れ込みが阻止できる。
When a short-circuit failure occurs in the secondary circuit of one converter device in a parallel operation state, the other converter devices collapse together. In order to prevent this, a backflow prevention diode is inserted into the output of each converter device. If a storage battery is connected to another converter device or the output of the faulty converter device, this backflow prevention diode can prevent current from flowing from the storage battery.

この場合、各々のコンバータ装置を並列接続し
た状態でも、各々のコンバータ装置の出力電圧を
制御できるように各々のコンバータ装置の電圧比
較回路部への検出電圧は前記の逆流防止用ダイオ
ードの前段の直流平滑出力電圧を検出している。
In this case, in order to control the output voltage of each converter even when the converters are connected in parallel, the detected voltage to the voltage comparator circuit of each converter is determined by the DC voltage in the preceding stage of the reverse current prevention diode. Detecting smoothed output voltage.

しかし、この逆流防止用ダイオードは負荷電流
の大きさによつて、0〜1.5Vの順方向降下電圧
があるため、軽負荷時と全負荷時における出力電
圧の定電圧精度はこの順方向降下電圧分以下には
高められない。
However, this reverse current prevention diode has a forward voltage drop of 0 to 1.5V depending on the magnitude of the load current, so the constant voltage accuracy of the output voltage at light load and full load depends on this forward voltage drop. It cannot be increased to less than a minute.

第3図は従来のコンバータ装置の一例を示した
もので、出力電圧の制御回路及び主回路電流の検
出回路を含む一般的な構成である。入力1に直流
電圧Viを入力し、スイツチング回路3により高周
波変換し、トランス4で絶縁及び電圧変換を行な
い、整流平滑出力回路5にて整流平滑する。逆流
防止用ダイオード6を経て出力7に安定な直流電
圧V0を得る。
FIG. 3 shows an example of a conventional converter device, which has a general configuration including an output voltage control circuit and a main circuit current detection circuit. A DC voltage V i is inputted to the input 1, converted to a high frequency by the switching circuit 3, subjected to insulation and voltage conversion by the transformer 4, and rectified and smoothed by the rectification and smoothing output circuit 5. A stable DC voltage V 0 is obtained at the output 7 through the reverse current prevention diode 6.

また、電圧比較回路9に逆流防止用ダイオード
の前段の電圧V1を帰還し、電圧の基準との比較
を行ない、制御回路10により電圧V1を一定に
するためスイツチング回路3の主スイツチング素
子の導通幅を制御する。さらに、電流検出回路
(以下単に変流器という。)2により主回路電流Ii
を検出し、整流平滑回路11により整流平滑し、
その信号を制御回路10に送出し、電流の基準と
比較し、過負荷時にはスイツチング回路3のスイ
ツチング素子を制御することにより出力電流I0
制限する。
In addition, the voltage V 1 at the front stage of the reverse current prevention diode is fed back to the voltage comparator circuit 9 and compared with the voltage reference, and the main switching element of the switching circuit 3 is controlled by the control circuit 10 to keep the voltage V 1 constant. Controls conduction width. Furthermore, the main circuit current I i is detected by the current detection circuit (hereinafter simply referred to as a current transformer) 2.
is detected and rectified and smoothed by the rectification and smoothing circuit 11,
The signal is sent to the control circuit 10, compared with a current reference, and in the event of an overload, the output current I0 is limited by controlling the switching element of the switching circuit 3.

第4図aにコンバータ装置の出力電圧V0と出
力電流I0との関係を示す。図中Aは出力電圧V0
あり、Bは逆流防止用ダイオードの前段の電圧
V1を示している。
FIG. 4a shows the relationship between the output voltage V 0 and the output current I 0 of the converter device. In the figure, A is the output voltage V 0 , and B is the voltage at the front stage of the reverse current prevention diode.
Showing V 1 .

図に示す如く出力電圧V0は逆流防止用ダイオ
ードの前段の電圧V1に比べ出力電流I0が増加する
と逆流防止用ダイオードの順方向降下電圧分だけ
低下する。このため、出力電圧V0の定電圧精度
はこの順方向降下電圧により高精度化できない欠
点がある。
As shown in the figure, when the output current I 0 increases, the output voltage V 0 decreases by the forward voltage drop of the reverse current prevention diode compared to the voltage V 1 at the front stage of the reverse current prevention diode. Therefore, there is a drawback that the constant voltage accuracy of the output voltage V 0 cannot be improved due to this forward voltage drop.

この不具合を補償するため、従来は第3図に示
すように、出力にダミー負荷8を接続し、逆流防
止用ダイオード6に軽負荷時においてもある一定
の電流を流し逆流防止用ダイオード6の順方向降
下電圧の変動を小さく抑える方法がとられてい
る。
To compensate for this problem, conventionally, as shown in Fig. 3, a dummy load 8 is connected to the output, and a certain current is passed through the reverse current prevention diode 6 even when the load is light. A method is used to keep the fluctuations in the directional voltage drop to a small level.

この方法はコンバータ装置の出力電圧を高精度
化する場合、ダミー負荷8は大容量なものを必要
とし発熱が大となり、また効率の低下を生ずる。
In this method, when the output voltage of the converter device is to be highly accurate, the dummy load 8 needs to have a large capacity, which generates a large amount of heat and causes a decrease in efficiency.

このダミー負荷8を軽負荷時のみに動作させ、
一定値以上の負荷時には切り放す方法をとること
ができるが、負荷検出回路及びダミー負荷8の切
り放し回路等を必要とし、経済性、信頼性の向上
に制約を与えていた。
This dummy load 8 is operated only during light loads,
Although it is possible to disconnect the load when the load exceeds a certain value, it requires a load detection circuit and a circuit for disconnecting the dummy load 8, which limits the improvement of economical efficiency and reliability.

本発明は上記の欠点を改善するために提案され
たもので、ダミー負荷等の発熱部品の付加を必要
とすることなく、コンバータ装置の出力電圧の定
電圧精度を高精度化し、コンバータ装置の性能、
経済性及び信頼性の向上を計つたコンバータ装置
を提供することを目的とする。
The present invention was proposed to improve the above-mentioned drawbacks, and improves the constant voltage accuracy of the output voltage of the converter device without requiring the addition of heat-generating parts such as a dummy load, thereby improving the performance of the converter device. ,
The object of the present invention is to provide a converter device with improved economic efficiency and reliability.

(課題を解決するための手段) 本発明は上記の目的を達成するため、直流−直
流変換回路、出力電圧の制御回路、前記直流−直
流変換回路の電流検出回路及び出力に逆流防止用
ダイオードを備え、直流入力電圧を制御された直
流電圧に変換するコンバータ装置において、前記
電流検出回路の出力を受けて動作する非線形補償
回路を備え、この非線形補償回路の出力信号によ
り、前記出力電圧の制御回路にある電圧比較回路
の電圧の基準値又は出力電圧の検出値に補償を加
えることを特徴とするコンバータ装置を要旨とす
るもので、コンバータ装置の電流検出回路の出力
を非線形補償回路により非線形化し、この出力を
前記出力電圧の制御回路にある電圧比較回路の電
圧の基準値または出力電圧の検出値に補償をかけ
ることにより前記逆流防止用ダイオードの順方向
降下電圧分の補償を行い、出力電圧の定電圧精度
の高精度化を計る。
(Means for Solving the Problems) In order to achieve the above object, the present invention includes a DC-DC converter circuit, an output voltage control circuit, a current detection circuit of the DC-DC converter circuit, and a backflow prevention diode in the output. A converter device for converting a DC input voltage into a controlled DC voltage, comprising: a nonlinear compensation circuit that operates in response to the output of the current detection circuit; and an output signal of the nonlinear compensation circuit that controls the output voltage control circuit. The gist is a converter device characterized by adding compensation to the voltage reference value or the detected output voltage value of the voltage comparison circuit in the converter device, in which the output of the current detection circuit of the converter device is made nonlinear by a nonlinear compensation circuit, By compensating this output with the voltage reference value or output voltage detection value of the voltage comparison circuit in the output voltage control circuit, the forward drop voltage of the reverse current prevention diode is compensated for, and the output voltage is Measures to improve constant voltage accuracy.

実施例 以下、図面に沿つて本発明の実施例について説
明する。なお、実施例は一つの例示であつて、本
発明の精神を逸脱しない範囲で種々の変更あるい
は改良を行いうることは言うまでもない。
Embodiments Hereinafter, embodiments of the present invention will be described with reference to the drawings. It should be noted that the embodiments are merely illustrative, and it goes without saying that various changes and improvements can be made without departing from the spirit of the present invention.

第1図は本発明の一実施例を示すブロツク図で
ある。第1図において主回路は第3図と同様に、
入力1に直流電圧Viを入力し、スイツチング回路
3により高周波変換し、トランス4で絶縁及び電
圧変換を行ない、整流平滑出力回路5にて整流、
平滑し、逆流防止用ダイオード6を介して出力7
に安定な直流電圧V0を得る。また電圧比較回路
9に逆流防止用ダイオードの前段の電圧V1を帰
還し、電圧の基準との比較を行ないその出力を制
御回路10に送り電圧V1を一定にすることによ
り出力電圧V0を一定にする。出力電圧V0を一定
にするため、スイツチング回路3の主スイツチン
グ素子の導通幅を制御する。
FIG. 1 is a block diagram showing one embodiment of the present invention. In Figure 1, the main circuit is as in Figure 3,
DC voltage V i is input to input 1, high frequency conversion is performed by switching circuit 3, insulation and voltage conversion is performed by transformer 4, and rectification is performed by rectification and smoothing output circuit 5.
Output 7 through smoothing and backflow prevention diode 6
Obtain a stable DC voltage V 0 at In addition, the voltage V 1 at the front stage of the backflow prevention diode is fed back to the voltage comparator circuit 9, and the voltage V 1 is compared with the voltage reference, and the output is sent to the control circuit 10 to keep the voltage V 1 constant, thereby controlling the output voltage V 0 . Make it constant. In order to keep the output voltage V 0 constant, the conduction width of the main switching element of the switching circuit 3 is controlled.

次に、本発明の特徴とする出力電圧の定電圧精
度の高精度化の動作について述べる。
Next, the operation of increasing the constant voltage accuracy of the output voltage, which is a feature of the present invention, will be described.

変流器2により主回路電流Iiを検出し、整流平
滑回路11により主回路電流Iiの値に比例した直
流電圧を得る。この出力を非線形補償回路12に
送る。非線形補償回路12にて第4図bに示すよ
うな出力電流−補正量となるような非線形出力を
得る。この出力を電圧比較回路9に送り、電圧の
基準値を上げるかまたは検出電圧値のレベルを下
げることにより電圧比較回路9は逆流防止用ダイ
オード6によつて生ずる誤差を補償して、制御回
路10に信号を送出し、スイツチング回路3のス
イツチング素子の導通幅を制御することにより、
出力電圧V0の定電圧精度の高精度化を計ること
ができる。
The current transformer 2 detects the main circuit current I i , and the rectifier and smoothing circuit 11 obtains a DC voltage proportional to the value of the main circuit current I i . This output is sent to the nonlinear compensation circuit 12. The nonlinear compensation circuit 12 obtains a nonlinear output with the output current minus the correction amount as shown in FIG. 4b. This output is sent to the voltage comparison circuit 9, and the voltage comparison circuit 9 compensates for the error caused by the backflow prevention diode 6 by increasing the voltage reference value or lowering the level of the detected voltage value. By sending a signal to and controlling the conduction width of the switching element of the switching circuit 3,
It is possible to improve the constant voltage accuracy of the output voltage V0 .

第2図a及びbに本発明の制御部の一回路例を
示す。第2図aにおいて、端子a,bに変流器2
の出力を接続し、抵抗R1にて電圧に変換する。
この電圧をダイオードD1,D2,D3,D4に
て整流し、コンデンサC1にて平滑して整流出力
を得る。この出力を抵抗R2,R3、ダイオード
D5よりなる非線形補償回路12により非線形化
し出力する。この出力を電圧比較回路9に送る。
電圧比較回路9において抵抗R5,R6,R7は
電圧の基準(+V)の分圧用抵抗である。端子
c,dに逆流防止用ダイオードの前段の電圧V1
を入力し抵抗R8,R9,R10にて分圧する。
抵抗R11と演算増幅器A1にて電圧比較回路を
構成している。演算増幅器A1の入力に非線形補
償回路12の出力を抵抗R4を介して印加するこ
とにより電圧の基準に補償をかけ逆流防止用ダイ
オードの順方向降下分の補償を行い出力電圧の定
電圧精度の高精度化を計る。
FIGS. 2a and 2b show an example of the circuit of the control section of the present invention. In Figure 2 a, current transformer 2 is connected to terminals a and b.
Connect the output of , and convert it to voltage with resistor R1.
This voltage is rectified by diodes D1, D2, D3, and D4, and smoothed by capacitor C1 to obtain a rectified output. This output is made nonlinear by a nonlinear compensation circuit 12 consisting of resistors R2 and R3 and a diode D5, and then output. This output is sent to the voltage comparator circuit 9.
In the voltage comparator circuit 9, resistors R5, R6, and R7 are voltage dividing resistors for a voltage reference (+V). The voltage V 1 in front of the reverse current prevention diode is applied to terminals c and d.
is input and divided by resistors R8, R9, and R10.
A voltage comparison circuit is configured by the resistor R11 and the operational amplifier A1. By applying the output of the nonlinear compensation circuit 12 to the input of the operational amplifier A1 via the resistor R4, the voltage reference is compensated for and the forward drop of the reverse current prevention diode is compensated for, thereby increasing the constant voltage accuracy of the output voltage. Measure accuracy.

出力電圧側で補償する場合は、逆流防止用ダイ
オードの前段の電圧V1を分圧し、入力する演算
増幅器A1の入力に非線形補償回路12の出力を
抵抗R4を介して極性を反転して印加することに
より、逆流防止用ダイオードの前段の電圧V1
補償をかけ逆流防止用ダイオードの順方向降下分
の補償を行い出力電圧の定電圧精度の高精度化を
計る。
When compensating on the output voltage side, divide the voltage V1 at the front stage of the reverse current prevention diode, and apply the output of the nonlinear compensation circuit 12 to the input of the operational amplifier A1 via the resistor R4 with the polarity reversed. By doing so, the voltage V 1 at the front stage of the reverse current prevention diode is compensated for, and the forward drop of the reverse current prevention diode is compensated for, thereby increasing the constant voltage accuracy of the output voltage.

なお、第2図aの整流平滑回路11はダイオー
ドD1,D2,D3,D4で整流しているため、
整流平滑出力にこのダイオードの順方向降下電圧
分の誤差が生ずる。変流器2の出力を大きな値と
することによりその影響を小さくすることができ
るが、ダイオードの順方向降下電圧分を含まない
整流平滑出力を得る方法の一回路例を第2図bに
示す。
In addition, since the rectifying and smoothing circuit 11 of FIG. 2a rectifies with diodes D1, D2, D3, and D4,
An error corresponding to the forward voltage drop of this diode occurs in the rectified and smoothed output. This effect can be reduced by increasing the output of the current transformer 2, but an example circuit for obtaining a rectified and smoothed output that does not include the forward voltage drop of the diode is shown in Figure 2b. .

第2図bにおいて、端子a,bに変流器2の出
力を接続し抵抗R1にて電圧に変換する。この電
圧を演算増幅器A1,A2、抵抗R2,R3,R
4,R5,R6,R7,R8、ダイオードD1,
D2よりなる絶対値整流回路にて整流する。この
値を抵抗R9、コンデンサC1にて平滑し、非線
形補償回路12に送る。
In FIG. 2b, the output of a current transformer 2 is connected to terminals a and b and converted into a voltage by a resistor R1. This voltage is applied to operational amplifiers A1, A2, resistors R2, R3, R
4, R5, R6, R7, R8, diode D1,
It is rectified by an absolute value rectifier circuit consisting of D2. This value is smoothed by a resistor R9 and a capacitor C1 and sent to the nonlinear compensation circuit 12.

(発明の効果) 叙上のように本発明によれば、電流検出回路の
出力を受けて動作する非線形補償回路の出力信号
により、出力電圧の電圧比較回路の設定値のレベ
ルに補償をかけることにより、逆流防止用ダイオ
ードの順方向降下電圧分の電圧を補償し、出力電
圧の定電圧精度の高精度化を計ることができる。
(Effects of the Invention) As described above, according to the present invention, the level of the set value of the voltage comparison circuit of the output voltage can be compensated by the output signal of the nonlinear compensation circuit that operates in response to the output of the current detection circuit. As a result, it is possible to compensate for the forward drop voltage of the reverse current prevention diode and to improve the constant voltage accuracy of the output voltage.

例えば48V出力整流器の場合、補償なしの場合
の電圧精度は±2%であるが、補償すると±1%
以下にすることが可能となる。結果として、ダミ
ー負荷時の部品を付加することなく、コンバータ
装置の性能、経済性及び信頼性の向上を計ること
ができる。
For example, for a 48V output rectifier, the voltage accuracy without compensation is ±2%, but with compensation it is ±1%.
It is possible to do the following. As a result, it is possible to improve the performance, economy, and reliability of the converter device without adding any components during dummy loads.

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

第1図は本発明の一実施例を示すブロツク図、
第2図a及びbは本発明の制御部の一回路例を示
す図、第3図は従来のコンバータ装置の一例を示
すブロツク図、第4図a及びbは従来例及び本発
明の出力特性を説明する図である。 1…入力、2…電流検出回路(変流器)、3…
スイツチング回路、4…トランス、5…整流平滑
出力回路、6…逆流防止用ダイオード、7…出
力、9…電圧比較回路、10…制御回路、11…
整流平滑回路、12…非線形補償回路。
FIG. 1 is a block diagram showing one embodiment of the present invention;
Figures 2a and b are diagrams showing an example of a circuit of the control section of the present invention, Figure 3 is a block diagram showing an example of a conventional converter device, and Figures 4a and b are output characteristics of the conventional example and the present invention. FIG. 1...Input, 2...Current detection circuit (current transformer), 3...
Switching circuit, 4...Transformer, 5...Rectification smoothing output circuit, 6...Reverse current prevention diode, 7...Output, 9...Voltage comparison circuit, 10...Control circuit, 11...
Rectifier smoothing circuit, 12...nonlinear compensation circuit.

Claims (1)

【特許請求の範囲】[Claims] 1 直流−直流変換回路、出力電圧の制御回路、
前記直流−直流変換回路の電流検出回路及び出力
に逆流防止用ダイオードを備え、直流入力電圧を
制御された直流電圧に変換するコンバータ装置に
おいて、前記電流検出回路の出力を受けて動作す
る非線形補償回路を備え、この非線形補償回路の
出力信号により、前記出力電圧の制御回路にある
電圧比較回路の電圧の基準値又は出力電圧の検出
値に補償を加えることを特徴とするコンバータ装
置。
1 DC-DC conversion circuit, output voltage control circuit,
A nonlinear compensation circuit that operates in response to the output of the current detection circuit in a converter device that includes a current detection circuit and a reverse current prevention diode in the output of the DC-DC conversion circuit and converts a DC input voltage into a controlled DC voltage. A converter device comprising: an output signal of the nonlinear compensation circuit to compensate a voltage reference value or a detected output voltage value of a voltage comparison circuit in the output voltage control circuit.
JP8663388A 1988-04-08 1988-04-08 Converter apparatus Granted JPH01259753A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8663388A JPH01259753A (en) 1988-04-08 1988-04-08 Converter apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8663388A JPH01259753A (en) 1988-04-08 1988-04-08 Converter apparatus

Publications (2)

Publication Number Publication Date
JPH01259753A JPH01259753A (en) 1989-10-17
JPH0586146B2 true JPH0586146B2 (en) 1993-12-10

Family

ID=13892428

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8663388A Granted JPH01259753A (en) 1988-04-08 1988-04-08 Converter apparatus

Country Status (1)

Country Link
JP (1) JPH01259753A (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19817498B4 (en) * 1998-04-20 2008-07-24 Hahn-Schickard-Gesellschaft für angewandte Forschung e.V. DC converter
JP7160658B2 (en) * 2018-12-06 2022-10-25 曙ブレーキ工業株式会社 DC power supply and power control method

Also Published As

Publication number Publication date
JPH01259753A (en) 1989-10-17

Similar Documents

Publication Publication Date Title
JP3542313B2 (en) Driving method of semiconductor switching element and power supply device
JP4104868B2 (en) Switching power supply
US11552570B2 (en) Systems and methods for voltage compensation based on load conditions in power converters
JP5448813B2 (en) Switching power supply
JP3419443B2 (en) DC power supply unit with multiple DC power supply circuits connected in parallel
JP2000152616A (en) Power supply device
JPH0586146B2 (en)
JP2827188B2 (en) Power supply
JP2850274B2 (en) Switching power supply
JP3406851B2 (en) Power supply
JPH04261358A (en) Switching power source
JP2968670B2 (en) DC-DC converter with protection circuit
JP2846679B2 (en) Parallel redundant operation of power supply units
US20240171081A1 (en) Active clamp flyback converter with accurate current sense and the method thereof
JPS614416A (en) Overcurrent detector for switching power source
JP2565482Y2 (en) Switching power supply
JPS5950772A (en) Power source
JPS5827215A (en) Overload protecting device for multi-output switching power source
JPS58198122A (en) Switching regulator
JP2555686Y2 (en) Switching power supply
JPS58215919A (en) Low input voltage protecting circuit
JP3490566B2 (en) Power supply
JPH05308774A (en) Power unit
JPH0524748B2 (en)
JPS5847444Y2 (en) Overcurrent protection circuit in DC power supply circuit

Legal Events

Date Code Title Description
LAPS Cancellation because of no payment of annual fees