JPH0534690B2 - - Google Patents
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- Publication number
- JPH0534690B2 JPH0534690B2 JP56031047A JP3104781A JPH0534690B2 JP H0534690 B2 JPH0534690 B2 JP H0534690B2 JP 56031047 A JP56031047 A JP 56031047A JP 3104781 A JP3104781 A JP 3104781A JP H0534690 B2 JPH0534690 B2 JP H0534690B2
- Authority
- JP
- Japan
- Prior art keywords
- voltage
- load
- resistor
- reference voltage
- series
- 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 - Lifetime
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Classifications
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/10—Regulating voltage or current
- G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is DC
- G05F1/56—Regulating voltage or current wherein the variable actually regulated by the final control device is DC using semiconductor devices in series with the load as final control devices
- G05F1/565—Regulating voltage or current wherein the variable actually regulated by the final control device is DC using semiconductor devices in series with the load as final control devices sensing a condition of the system or its load in addition to means responsive to deviations in the output of the system, e.g. current, voltage, power factor
- G05F1/567—Regulating voltage or current wherein the variable actually regulated by the final control device is DC using semiconductor devices in series with the load as final control devices sensing a condition of the system or its load in addition to means responsive to deviations in the output of the system, e.g. current, voltage, power factor for temperature compensation
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Automation & Control Theory (AREA)
- Control Of Electrical Variables (AREA)
- Continuous-Control Power Sources That Use Transistors (AREA)
Description
【発明の詳細な説明】
この発明は特に温度変化による不安定な負荷電
流特性を改善した定電流回路に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention particularly relates to a constant current circuit that improves unstable load current characteristics due to temperature changes.
一般に電子装置には入力電圧の変動および負荷
変動に対して負荷電流をある一定の範囲内に保持
する定電流回路が必要なことが多い。このような
定電流回路は通常電源間に負荷側の負荷「RL」
と直列にトランジスタを設け、このトランジスタ
のベース電流を制御して負荷電圧（出力電圧）
「VL」を一定にすることによつて定電流「IL」
（VL／RL）を発生するものである。さらにトラン
ジスタのベース電流を制御して負荷電圧「VL」
を一定にするには、所定の基準電圧と負荷電圧
「VL」を演算増幅器等に供給して、両者の電圧の
差が常に「０」になる様に制御する。この様にし
て、安定化された出力電圧および予め設定された
負荷の値によつて定電流である負荷電流を得るこ
とができるものであるが、通常この負荷には炭素
皮膜抵抗等が用いられ、この炭素皮膜抵抗はマイ
ナス数百PPM／℃（1°当たりの抵抗変化率）の
温度特性を有している。すなわち負荷が温度変化
によつて、その抵抗値が変動すれば、負荷電流は
変化することになる。従つて特に温度変化の激し
い環境等（例えば自動車）では、負荷電流が不安
定になる欠点がある。 In general, electronic devices often require a constant current circuit that maintains a load current within a certain range despite fluctuations in input voltage and load. This kind of constant current circuit usually has a load “R L ” on the load side between the power supplies.
A transistor is installed in series with the
Constant current ``I L '' by keeping ``V L '' constant
(V L /R L ). Furthermore, the base current of the transistor is controlled to reduce the load voltage "V L ".
In order to keep it constant, a predetermined reference voltage and a load voltage "V L " are supplied to an operational amplifier or the like, and the difference between the two voltages is controlled to be always "0". In this way, a constant load current can be obtained using a stabilized output voltage and a preset load value, but normally a carbon film resistor or the like is used for this load. This carbon film resistor has a temperature characteristic of minus several hundred PPM/℃ (resistance change rate per degree). That is, if the resistance value of the load changes due to temperature changes, the load current will change. Therefore, there is a drawback that the load current becomes unstable, especially in environments where temperature changes are severe (for example, in automobiles).
この発明は上記の様な事情を鑑みなされたもの
で、温度変化による負荷抵抗値の変動に対して基
準電圧を補正することによつて、温度変化に対し
て負荷電流を得ることのできる定電流回路を提供
することを目的とする。 This invention was made in view of the above circumstances, and it is a constant current that can obtain a load current with respect to temperature changes by correcting the reference voltage against fluctuations in the load resistance value due to temperature changes. The purpose is to provide circuits.
以下図面を参照してこの発明の一実施例を説明
する。図はその構成を示すもので、電源電圧VCC
間の入力側に直列接続の抵抗１１，１２が設けら
れ、この抵抗１１，１２と並列にトランジスタ１
３、抵抗R1，R2およびダイオード接続のトラン
ジスタ１４が直列接続されて設けられる。このト
ランジスタ１３のコレクタには電圧VCCが供給さ
れ、またそのベースには抵抗１１を介して電圧
VCCに応じた電流が供給される。またトランジス
タ１４のコレクタには抵抗R2が接続され、その
エミツタは接地（GND）される。そして抵抗
R1，R2の共通接続点から基準電圧V2が正（＋）
側の入力に供給される演算増幅器１５が設けら
れ、この演算増幅器１５の出力電圧は負荷抵抗
RLと直列に接続されたトランジスタ１６のベー
スに供給される。さらにこのトランジスタ１６の
エミツタと接地（GND）間に負荷抵抗RLが設け
られ、またそのコレクタにはこの実施例では電流
計Ａを介して電圧VCCが供給される。そしてこの
負荷抵抗RLの両端子間に発生する電圧VLが演算
増幅器１５の負（−）側に入力に供給される。 An embodiment of the present invention will be described below with reference to the drawings. The figure shows its configuration, where the power supply voltage V CC
Resistors 11 and 12 connected in series are provided on the input side between
3. Resistors R 1 and R 2 and a diode-connected transistor 14 are connected in series. The collector of this transistor 13 is supplied with a voltage V CC , and the base thereof is supplied with a voltage via a resistor 11.
Current is supplied according to V CC . Further, a resistor R2 is connected to the collector of the transistor 14, and its emitter is grounded (GND). and resistance
Reference voltage V 2 is positive (+) from the common connection point of R 1 and R 2
An operational amplifier 15 is provided which is supplied to the side input, and the output voltage of this operational amplifier 15 is
It is supplied to the base of transistor 16 connected in series with R L. Further, a load resistor R L is provided between the emitter of this transistor 16 and ground (GND), and a voltage V CC is supplied to the collector of the transistor 16 via an ammeter A in this embodiment. The voltage V L generated between both terminals of the load resistor R L is supplied to the negative (-) side of the operational amplifier 15 .
この様に構成される定電流回路において、まず
抵抗１１，１２を所定の値に設定してトランジス
タ１３のベースと抵抗１１，１２の共通接続点に
一定の電圧V1を発生させる。この電圧V1に応じ
て演算増幅器１５の正（＋）側入力に供給される
基準電圧V2が発生する。すなわち基準電圧V2は
V2＝V1−2VBE／R1＋R2・R2＋VBE ……(1)
となる。ここで
VBE…トランジスタ１３，１４のベースエミツタ
電圧
である。そしてこの基準電圧V2が供給される演
算増幅器１５は基準電圧V2が負（−）側の入力
に供給される電圧VLよりも大きい場合（V2＞
VL）には出力電圧がハイレベル、すなわちトラ
ンジスタ１６のベース電流が増大しトランジスタ
１６のコレクタ電流が増大する。従つて負荷抵抗
RL、トランジスタ１６を介して負荷電流が増大
する。この負荷電流をいま電流ILとすると、負荷
抵抗RLの両端子間に発生する電圧VLは
VL＝RL・IL ……(2)
となる。そしてこの電圧VLは演算増幅器１５の
負（−）側の入力に供給され、この演算増幅器１
５の出力電圧は基準電圧V2より電圧VLが大きく
なる（V2＜VL）、とハイレベルからローレベルへ
変化し、それによつてトラランジスタ１６のベー
ス電流が減少してそのコレクタ電流、すなわち負
荷電流ILが減少する。すなわち演算増幅器１５に
よつて、電圧VLはほぼ基準電圧V2の値に保持さ
れることになる。このような負荷抵抗RLに発生
する出力電圧VLと負荷電流ILの特性において負荷
抵抗RLが温度変化によつて変動した場合、負荷
電流ILを一定に保持するには出力電圧VLをそれに
応じた値にする必要がある。すなわち基準電圧
V2が温度変化に対して一定の比率で変化するこ
とによつて、負荷電流ILの温度変化による変動を
補正できるものである。従つて基準電圧V2が温
度変化によつて変化した値をV2tとすれば上記式
(1)より、
V2t＝V1−2VBEt／R1t＋R2t・R2t＋VBEt ……(3)
となり、R1t、R2tおよびVBEtはそれぞれ温度変化
後の抵抗R1，R2およびトランジスタ１３，１４
の電圧VBEの値である。 In the constant current circuit configured in this way, first, the resistors 11 and 12 are set to predetermined values to generate a constant voltage V 1 at the common connection point between the base of the transistor 13 and the resistors 11 and 12. A reference voltage V 2 that is supplied to the positive (+) side input of the operational amplifier 15 is generated in accordance with this voltage V 1 . That is, the reference voltage V 2 is V 2 =V 1 −2V BE /R 1 +R 2 ·R 2 +V BE (1). Here, V BE is the base-emitter voltage of the transistors 13 and 14. The operational amplifier 15 to which this reference voltage V 2 is supplied operates if the reference voltage V 2 is larger than the voltage V L supplied to the negative (-) side input (V 2 >
V L ), the output voltage is at a high level, that is, the base current of the transistor 16 increases, and the collector current of the transistor 16 increases. Therefore the load resistance
R L , the load current increases through transistor 16 . Assuming that this load current is current I L , the voltage V L generated between both terminals of the load resistor R L is V L = R L · I L (2). This voltage V L is then supplied to the negative (-) side input of the operational amplifier 15.
The output voltage of transistor 5 changes from high level to low level when voltage V L becomes larger than reference voltage V 2 (V 2 < V L ), thereby the base current of transistor 16 decreases and its collector current decreases. , that is, the load current I L decreases. In other words, the operational amplifier 15 maintains the voltage V L at approximately the value of the reference voltage V 2 . In the characteristics of the output voltage V L and load current I L generated in the load resistance R L, if the load resistance R L fluctuates due to temperature changes, the output voltage V It is necessary to set L to a corresponding value. i.e. reference voltage
By changing V 2 at a constant rate with respect to temperature changes, it is possible to correct fluctuations in load current I L due to temperature changes. Therefore, if the value that the reference voltage V 2 changes due to temperature change is V 2t , then the above formula
From (1), V 2t = V 1 −2V BEt / R 1t + R 2t・R 2t + V BEt ...(3), and R 1t , R 2t and V BEt are the resistances R 1 and R 2 after temperature change, respectively. and transistors 13, 14
is the value of the voltage V BE .
さらに温度変化後の負荷抵抗RLの抵抗値をRLt
とすれば、
IL＝V2／RL＝V2t／RLt ……(4)
となる式(4)が成立するように、基準電圧V2tを設
定する必要がある。すなわち基準電圧V2の温度
変化に対して基準電圧V2tはRLt／RLである変化率を
有するように設定され、この変化率は負荷抵抗の
材質によつて特定できるものである。ところで、
上記式(3)より基準電圧V2tは電圧V1が一定であ
り、さらにトランジスタ１３，１４の電圧VBEtは
トランジスタの特性（通常−２〔ｍＶ〕／℃）に
よつて決定されるため、抵抗R1，R2の設定が大
きく影響されることになる。すなわち上記式(4)を
満足するような温度特性を有する抵抗R1，R2を
設定するものであるが、具体的には上記式(3)およ
び(4)より
V2t＝V1−２（VBE＋at）／R1（１＋ｂ／100ｔ）＋R2（
１＋b′／100ｔ）・R2（１＋b′／100ｔ）＋（VBE＋at
）＝RL（１＋ｄ／100ｔ）／RL・V2……(5)
となり、ここで
ａ：トランジスタの温度係数〔ｍＶ／℃〕
ｂ：抵抗R1の温度係数〔％／℃〕
b′：抵抗R2の温度係数〔％／℃〕
ｄ：負荷抵抗RLの温度係数〔％／℃〕
ｔ：温度変化値〔℃〕
である。従つて上記式(5)より負荷抵抗RLの温度
係数ｄが決定されるならば、温度変化に対して安
全な負荷電流IL＝（V2／RL）を求めるには、温度係数
ｂ，b′を有する抵抗R1，R2を設定することにな
る。 Furthermore, the resistance value of the load resistance R L after the temperature change is R Lt
Then, it is necessary to set the reference voltage V 2t so that the formula (4) holds: I L =V 2 /R L =V 2t /R Lt (4). That is, the reference voltage V 2t is set to have a rate of change of R Lt /R L with respect to a temperature change of the reference voltage V 2 , and this rate of change can be specified by the material of the load resistor. by the way,
From the above equation (3), the reference voltage V 2t is the voltage V 1 which is constant, and the voltage V BEt of the transistors 13 and 14 is determined by the characteristics of the transistors (usually -2 [mV]/°C). The settings of resistors R 1 and R 2 will be greatly affected. In other words, the resistors R 1 and R 2 are set to have temperature characteristics that satisfy the above equation (4). Specifically, from the above equations (3) and (4), V 2t = V 1 −2 (V BE +at)/R 1 (1+b/100t)+R 2 (
1+b'/100t)・R 2 (1+b'/100t)+(V BE +at
)=R L (1+d/100t)/R L・V 2 ...(5) where a: Temperature coefficient of transistor [mV/℃] b: Temperature coefficient of resistor R 1 [%/℃] b' : Temperature coefficient of resistance R 2 [%/°C] d: Temperature coefficient of load resistance R L [%/°C] t: Temperature change value [°C]. Therefore, if the temperature coefficient d of the load resistance R L is determined from the above equation (5), the temperature coefficient b must be used to find the load current I L = (V 2 /R L ) that is safe against temperature changes. , b′, and resistors R 1 and R 2 are set.
例えば、定電流回路をIC化した場合には、抵
抗R1，R2は拡散抵抗（例えばＰ型半導体）によ
つて形成する。いま仮に温度20℃の状態で負荷抵
抗RLの抵抗値を50〔Ω〕および負荷電流ILを約
20.4〔ｍＡ〕とする。従つてV2≒VLより基準電圧
V2は約1.02〔Ｖ〕となり、これに応じて電圧V1を
2.22〔Ｖ〕（VCC＝７〔Ｖ〕）に設定し、さらに抵抗
R1，R2の抵抗値をそれぞれ2.7〔ｋΩ〕、1.8〔ｋΩ〕
およびトランジスタ１３，１４の電圧VBEを0.65
〔Ｖ〕に設定するものである。そして負荷抵抗RL
の温度係数ｄが−５×102／104〔％／℃〕（−
500PPM／℃）であり、温度が20〔℃〕から120
〔℃〕に変化（ｔ＝100〔℃〕）した場合、負荷抵抗
RLtは約47.5〔Ω〕となる。また、トランジスタ１
３，１４の温度係数ａは、通常−２〔ｍＶ〕／℃
である。従つて上記式(5)より
V2t＝2.22−２（0.65−２×10-3×ｔ）／R1（１＋
ｂ／100ｔ）＋R2（１＋b′／100ｔ）・R2（１＋b′／10
0ｔ）＋（0.65−２×10-3×ｔ）
＝（１−５×102／104×102ｔ）（1.02）……(6)
となり、この式(6)および不純物濃度等の製造条件
等から抵抗R1，R2は温度係数ｂ，b′がそれぞれ
＋0.25〔％／℃〕（＋2500PPM／℃）とする拡散
抵抗であれば、ｔが100〔℃〕の場合、抵抗値はそ
れぞれ約3.375〔ｋΩ〕、2.25〔ｋΩ〕となる。また
トランジスタ１３，１４の各電圧VBEt（ｔ＝100
〔℃〕）は約0.45〔Ｖ〕となる。従つて温度変化後
の基準電圧V2tは約0.979〔Ｖ〕となり、負荷電流IL
は約20.5〔ｍＡ〕となる。すなわち、100℃の温度
変化によつて負荷抵抗RLの抵抗値が約５％変動
しても負荷電流ILは、ほぼ一定にすることができ
る。なお、上記拡散抵抗の抵抗値は通常層抵抗
（抵抗率／厚味）に対して長さと幅の比率（ｌ／
ω）を変えることによつて設定でき、抵抗率は温
度が−10℃〜100℃程度の範囲では温度の上昇に
伴つて増大する傾向を示し、その温度係数は不純
物の濃度、分布、および形状（特に低抗体の幅）
などによつて影響を受けるが、上記の温度範囲付
近では＋0.1〜0.25〔％／℃〕程度である。 For example, when the constant current circuit is implemented as an IC, the resistors R 1 and R 2 are formed by diffused resistors (eg, P-type semiconductor). Now suppose that the resistance value of the load resistor R L is 50 [Ω] and the load current I L is approximately 20°C.
20.4 [mA]. Therefore, V 2 ≒ V L , the reference voltage
V 2 is approximately 1.02 [V], and the voltage V 1 is adjusted accordingly.
Set to 2.22 [V] (V CC = 7 [V]), and then add a resistor.
The resistance values of R 1 and R 2 are 2.7 [kΩ] and 1.8 [kΩ], respectively.
and the voltage V BE of transistors 13 and 14 is 0.65
It is set to [V]. and load resistance R L
The temperature coefficient d of
When the temperature changes to [℃] (t = 100 [℃]), the load resistance
R Lt is approximately 47.5 [Ω]. Also, transistor 1
The temperature coefficient a of 3.14 is usually -2 [mV]/℃
It is. Therefore, from the above formula (5), V 2t = 2.22-2 (0.65-2×10 -3 ×t)/R 1 (1+
b/100t)+R 2 (1+b'/100t)・R2 (1+b'/10
0t) + (0.65-2×10 -3 ×t) = (1-5×10 2 /10 4 ×10 2 t) (1.02)...(6), and this equation (6) and impurity concentration etc. Considering manufacturing conditions, resistances R 1 and R 2 are diffused resistors with temperature coefficients b and b' of +0.25 [%/°C] (+2500 PPM/°C), respectively, and when t is 100 [°C], the resistance is The values are approximately 3.375 [kΩ] and 2.25 [kΩ], respectively. In addition, each voltage V BEt of transistors 13 and 14 (t=100
[°C]) is approximately 0.45 [V]. Therefore, the reference voltage V 2t after temperature change is approximately 0.979 [V], and the load current I L
is approximately 20.5 [mA]. That is, even if the resistance value of the load resistor R L varies by about 5% due to a temperature change of 100° C., the load current I L can be kept almost constant. Note that the resistance value of the above-mentioned diffused resistor is usually determined by the ratio of length and width (l/
Resistivity tends to increase as the temperature rises in the temperature range of -10℃ to 100℃, and its temperature coefficient depends on the concentration, distribution, and shape of impurities. (Especially low antibody width)
Although it is affected by the above temperature range, it is about +0.1 to 0.25 [%/°C] around the above temperature range.
以上詳述したように、この発明によれば、温度
変化による負荷抵抗値の変動に対して基準電圧を
補正することから出力電圧を補正できることによ
つて、温度変化に対して安定な負荷電流を得るこ
とのできる定電流回路を提供できる。 As described in detail above, according to the present invention, by correcting the reference voltage in response to fluctuations in load resistance due to temperature changes, it is possible to correct the output voltage, thereby maintaining a stable load current against temperature changes. A constant current circuit that can be obtained can be provided.
図はこの発明の一実施例に係る定電流回路の概
略的構成図である。
１１，１２，R1，R2，R4……抵抗、１３，１
４，１６……トランジスタ、１５……演算増幅
器。
The figure is a schematic configuration diagram of a constant current circuit according to an embodiment of the present invention. 11, 12, R 1 , R 2 , R 4 ...Resistance, 13, 1
4, 16...transistor, 15...operational amplifier.
Claims (1)
よびその負荷抵抗に流れる負荷電流を制御電圧に
応じて一定に保持するように制御する電流制御素
子と、 前記負荷抵抗の両端子間に発生する負荷電圧を
一方の入力電圧とし、他方の入力電圧として与え
られる基準電圧と前記一方の入力電圧とを比較
し、その比較結果に応じて前記電流制御素子に前
記制御電圧を供給する電圧比較手段と、 電源間に直列接続して設けられて、前記負荷抵
抗の温度変化による抵抗値の変動に対して前記負
荷電流を一定としたときの前記負荷電圧の変化に
応じて前記基準電圧が一定比率で変化するように
予め設定された抵抗値及びほぼ同一の温度係数を
有する第１の抵抗と第２の抵抗を有し、この第１
及び第２の各抵抗に直列接続されて、前記第１及
び第２の各抵抗の抵抗値と共に前記基準電圧を設
定するためのベース・エミツタ間電圧を発生し、
前記第１及び第２の各抵抗の前記温度係数とは異
なる温度係数を有する複数のトランジスタとから
なり、前記第１及び第２の各抵抗の接続点から発
生する前記基準電圧を前記電圧比較手段の前記他
方の入力電圧として供給する基準電圧発生手段と
を具備したことを特徴とする定電流回路。[Scope of Claims] 1. A load resistor connected in series between power supplies, a current control element that controls the load current flowing through the load resistor to be kept constant according to a control voltage, and both ends of the load resistor. The load voltage generated between the terminals is taken as one input voltage, the one input voltage is compared with a reference voltage given as the other input voltage, and the control voltage is supplied to the current control element according to the comparison result. and a voltage comparing means connected in series between power supplies, the voltage comparing means being connected in series between the power supplies, the voltage comparing means being connected in series between the power supplies to adjust the reference voltage according to a change in the load voltage when the load current is kept constant with respect to a change in the resistance value of the load resistor due to a change in temperature. The first resistor has a first resistor and a second resistor having a preset resistance value and approximately the same temperature coefficient so that the voltage changes at a constant ratio.
and a second resistor connected in series to generate a base-emitter voltage for setting the reference voltage together with the resistance values of the first and second resistors;
and a plurality of transistors having a temperature coefficient different from the temperature coefficient of each of the first and second resistors, and the reference voltage generated from the connection point of each of the first and second resistors is compared with the voltage comparing means. and a reference voltage generating means for supplying the other input voltage as the other input voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3104781A JPS57146325A (en) | 1981-03-04 | 1981-03-04 | Constant current circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3104781A JPS57146325A (en) | 1981-03-04 | 1981-03-04 | Constant current circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS57146325A JPS57146325A (en) | 1982-09-09 |
| JPH0534690B2 true JPH0534690B2 (en) | 1993-05-24 |
Family
ID=12320561
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3104781A Granted JPS57146325A (en) | 1981-03-04 | 1981-03-04 | Constant current circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS57146325A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011040323A (en) * | 2009-08-17 | 2011-02-24 | Canon Inc | Electromagnetic induction heating type heating device |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0618014B2 (en) * | 1984-11-21 | 1994-03-09 | 日本電気株式会社 | Reference voltage generation circuit |
| CN102508510B (en) * | 2011-12-26 | 2013-11-06 | 朱月林 | Single-chip ultra-high-voltage constant-current circuit |
| WO2023095473A1 (en) * | 2021-11-24 | 2023-06-01 | Tdk株式会社 | Thin-film capacitor |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5829533B2 (en) * | 1974-11-07 | 1983-06-23 | 株式会社東芝 | Ondo Hoshiyou Cairo |
| JPS54143173A (en) * | 1978-04-28 | 1979-11-08 | Sony Tektronix Corp | Circuit with two electrical current sources |
-
1981
- 1981-03-04 JP JP3104781A patent/JPS57146325A/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011040323A (en) * | 2009-08-17 | 2011-02-24 | Canon Inc | Electromagnetic induction heating type heating device |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS57146325A (en) | 1982-09-09 |
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