JPH0224934A - Cathode current stabilizer circuit - Google Patents

Cathode current stabilizer circuit

Info

Publication number
JPH0224934A
JPH0224934A JP17372288A JP17372288A JPH0224934A JP H0224934 A JPH0224934 A JP H0224934A JP 17372288 A JP17372288 A JP 17372288A JP 17372288 A JP17372288 A JP 17372288A JP H0224934 A JPH0224934 A JP H0224934A
Authority
JP
Japan
Prior art keywords
voltage
cathode
current
cathode current
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.)
Granted
Application number
JP17372288A
Other languages
Japanese (ja)
Other versions
JP2866655B2 (en
Inventor
Wataru Koiso
小磯 渉
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.)
Tokyo Electronic Industry Co Ltd
Original Assignee
Tokyo Electronic Industry 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 Tokyo Electronic Industry Co Ltd filed Critical Tokyo Electronic Industry Co Ltd
Priority to JP63173722A priority Critical patent/JP2866655B2/en
Publication of JPH0224934A publication Critical patent/JPH0224934A/en
Application granted granted Critical
Publication of JP2866655B2 publication Critical patent/JP2866655B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Abstract

PURPOSE:To stabilize cathode current by directly sensing the cathode current of a CRT, and controlling the cathode voltage in accordance with its level. CONSTITUTION:When the cathode current Ik of a CRT increases or decreases, the voltage at the two ends of a resistance R1 of a current sensing circuit 14, and the base voltage of a transistor Q1 rises or falls. This raises or sinks the emitter voltage of the transistor Q1 through a reference voltage circuit 16, and the cathode voltage of a Zener diode Z1 also rises or falls. This in turn raises or sinks the base voltage or emitter voltage of another transistor Q2, and the current Ik decreases or increases. Thereby the cathode current variation can be sensed by simple constitution to allow control of cathode sensing 4.

Description

【発明の詳細な説明】 [発明の目的] (産業上の利用分野) この発明は陰極線管(以下CRTと記す)のエージング
装置において、CRTのカソード電流を安定化するため
のカソード電流安定化回路に関する。
[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) This invention provides a cathode current stabilizing circuit for stabilizing the cathode current of the CRT in an aging device for a cathode ray tube (hereinafter referred to as CRT). Regarding.

(従来の技術) CRTのエージング装置では、エージング時に輝度を安
定化させる必要がある。CRTの輝度を安定化させるに
は、CRTのカソード電流を安定化させなければならな
い。
(Prior Art) In a CRT aging device, it is necessary to stabilize the brightness during aging. In order to stabilize the brightness of a CRT, the cathode current of the CRT must be stabilized.

第3図は従来のカソード電流安定化回路を示している。FIG. 3 shows a conventional cathode current stabilizing circuit.

CRTIのアノードに対して高圧電f1j回路2から高
圧が与えられる。高圧電源回路2の出力電流は、出力電
流検出回路3により検出される。
A high voltage is applied to the anode of the CRTI from a high voltage electric circuit 2. The output current of the high voltage power supply circuit 2 is detected by an output current detection circuit 3.

この出力電流検出回路3からの検出信号は、カソード電
源回路4の出力制御端に与えられ、その出力電圧(カソ
ード電圧)を制御する。基準電圧回路5は、カソード電
源回路4の基準となる電圧値を出力しており、カソード
電圧はこの基準電圧をベースとして制御される。
The detection signal from the output current detection circuit 3 is applied to the output control terminal of the cathode power supply circuit 4 to control its output voltage (cathode voltage). The reference voltage circuit 5 outputs a voltage value that serves as a reference for the cathode power supply circuit 4, and the cathode voltage is controlled based on this reference voltage.

上記従来の回路は、高圧電源回路2の出力電流の変化を
監視して、その変化に応じてカソード電流を制御してい
る。このために、高圧?!S源回路2の出力電流を検出
した場合、その変動成分にはグリッド電流や高圧電源回
路のリーク電流の成分等が含まれることになる。よって
、正確にカソード電流の変動を検出するためには、電流
検出回路が複雑となり、また検出自体も不正確であるた
めカソード電流の安定性が劣る。さらにまた検出回路3
が故障すると、高圧電源回路2の高電圧がカッド電源回
路4に印加されCRTIを破損させる恐れがある。
The conventional circuit described above monitors changes in the output current of the high voltage power supply circuit 2 and controls the cathode current according to the changes. High pressure for this? ! When the output current of the S source circuit 2 is detected, its fluctuation components include grid current, leakage current components of the high voltage power supply circuit, and the like. Therefore, in order to accurately detect fluctuations in cathode current, a current detection circuit becomes complicated, and the detection itself is inaccurate, resulting in poor stability of cathode current. Furthermore, the detection circuit 3
If the high-voltage power supply circuit 2 fails, the high voltage of the high-voltage power supply circuit 2 may be applied to the quad power supply circuit 4, potentially damaging the CRTI.

(発明が解決しようとする課題) 従来のカッニド電流安定化回路は、電流検出回路が複雑
であり、その割にはカソード電流の変動の検出性能が劣
る。また、回路の故障によりCRTの高電圧がカソード
電源回路に印加されてCRTを破損する恐れが高いとい
う問題がある。
(Problems to be Solved by the Invention) The conventional cannidic current stabilizing circuit has a complicated current detection circuit, and its performance in detecting fluctuations in cathode current is relatively poor. Another problem is that there is a high possibility that the high voltage of the CRT will be applied to the cathode power supply circuit due to a circuit failure, thereby damaging the CRT.

そこでこの発明は、カソード電流の変動の検出性能か良
く、よって安定度を向」二でき、しかも簡)11な構成
で安全度も高いカソード電流安定化回路を提供すること
を目的とする。
SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a cathode current stabilizing circuit that has good detection performance for cathode current fluctuations, can improve stability, has a simple configuration, and has a high degree of safety.

[発明の構成] (課題を解決するための手段) この発明は、陰極線管のカソード電流を検出し、得られ
た検出信号レベルに応じてカソード電流の検出ラインを
通じて該カソード電流を制御する構成としたものである
[Structure of the Invention] (Means for Solving the Problems) The present invention has a structure that detects the cathode current of a cathode ray tube and controls the cathode current through a cathode current detection line according to the obtained detection signal level. This is what I did.

(作用) 」二記の手段により、CRTのカソード電流は、直接電
流検出回路によって検出され、その検出電流のレベルに
応じて、該検出ラインを通じて電圧制御され電流を安定
化されることになる。
(Function) By means of the above two methods, the cathode current of the CRT is directly detected by the current detection circuit, and the voltage is controlled through the detection line to stabilize the current according to the level of the detected current.

(実施例) 以下、この発明の実施例を図面を参照して説明する。(Example) Embodiments of the present invention will be described below with reference to the drawings.

第1図はこの発明の一実施例を示している。FIG. 1 shows an embodiment of the invention.

CRTIIのアノードに対しては高圧電源回路12から
の高圧が与えられる。一方、CRTIIのカソードKに
たいしては、電流検出ラインを兼用した電圧制御ライン
13が接続される。このライン13は電流検出回路14
に接続されており、また電源回路15の出力部にも接続
されている。
A high voltage from a high voltage power supply circuit 12 is applied to the anode of the CRT II. On the other hand, a voltage control line 13 which also serves as a current detection line is connected to the cathode K of the CRT II. This line 13 is the current detection circuit 14
It is also connected to the output section of the power supply circuit 15.

電流検出回路14は、カソード電流を検出するとともに
、そのレベルに応じて電源回路15を制御してカソード
電圧に影響を与え、カソード電流を安定化することがで
きる。電源回路に接続された基$電圧回路16は、カソ
ード電圧の基準となる電圧を設定している。
The current detection circuit 14 can detect the cathode current and control the power supply circuit 15 according to the level thereof to influence the cathode voltage and stabilize the cathode current. A base voltage circuit 16 connected to the power supply circuit sets a reference voltage for the cathode voltage.

第2図、は、第1図のブロック構成を更に具体的に示し
ている。
FIG. 2 shows the block configuration of FIG. 1 in more detail.

CRTIIのカソードには、抵抗R1,R6を介して接
地されるとともに抵抗R3を介してトランジスタQ1の
ベースに接続され、る。トランジスタQ1のエミッタは
、抵抗R4を介して基■電圧回路16に接続され、コレ
クタは基準電圧回路16に接続されるとともに、交流バ
イパス用のコンデンサCを介して接地され、また抵抗R
1とR6の接続点に接続されている。トランジスタQ2
は、コレクタに電源回路15が接続され、エミッタは抵
抗R1とR6の接続点に接続されている。そしてトラン
ジスタQ2のベースは、抵抗R5、ツェナーダイオード
Z1を介してトランジスタQ1のエミッタに接続されて
いる。また抵抗R5とダイオードZ1の接続点には抵抗
R2を介して基準電圧が印加されている。
The cathode of CRTII is grounded via resistors R1 and R6 and connected to the base of transistor Q1 via resistor R3. The emitter of the transistor Q1 is connected to the reference voltage circuit 16 via a resistor R4, and the collector is connected to the reference voltage circuit 16 and grounded via an AC bypass capacitor C.
It is connected to the connection point of 1 and R6. Transistor Q2
The collector is connected to the power supply circuit 15, and the emitter is connected to the connection point between the resistors R1 and R6. The base of the transistor Q2 is connected to the emitter of the transistor Q1 via a resistor R5 and a Zener diode Z1. Further, a reference voltage is applied to the connection point between the resistor R5 and the diode Z1 via the resistor R2.

次に上記の回路の動作を具体的に説明すると以下の通り
である。
Next, the operation of the above circuit will be specifically explained as follows.

■CRTのカソード電流1には、抵抗R1とR6と通っ
て流れる。ここで抵抗R1の両端には電圧が生じる。
(2) CRT cathode current 1 flows through resistors R1 and R6. Here, a voltage is generated across the resistor R1.

■トランジスタQ1のベースに流れる電流は、CRTの
カソード電流1kに比べて無視できる程度の電流となる
ように抵抗R4の値が設定されている。
(2) The value of the resistor R4 is set so that the current flowing to the base of the transistor Q1 is negligible compared to the cathode current 1k of the CRT.

■トランジスタロ1のコレクタ・エミッタ間の電圧VC
EIは、 VCEI −1k−R+VBE(sat)1となる。V
 BE(sat)IはトランジスタQ1のベス・エミッ
タ間の飽和電圧である。
■Voltage VC between collector and emitter of transistor RO1
EI becomes VCEI -1k-R+VBE(sat)1. V
BE(sat)I is the saturation voltage between the best emitter of the transistor Q1.

■そしてトランジスタQ2のベース電流を無視すると V CEI −V Zl+ V BIE(sat)2と
なる。V BE(sat)2はトランジスタQ2のベス
・エミッタ間の飽和電圧、VZlはツェナーダイオード
Z1のツェナー電圧である。
(2) If the base current of transistor Q2 is ignored, V CEI - V Zl+ V BIE (sat)2. VBE(sat)2 is the saturation voltage between the base and emitter of the transistor Q2, and VZl is the Zener voltage of the Zener diode Z1.

■V BEE(sat) 1とV BE(sat)2が
等しいとすると、!に−R1−Vz1 1 k −(VZI/R1)となり、カソード電流Ik
が安定する。
■Assuming that V BEE (sat) 1 and V BE (sat) 2 are equal,! -R1-Vz1 1 k -(VZI/R1), and the cathode current Ik
becomes stable.

今、CRTのカソード電流1kが増加したとすると、抵
抗R1の両端の電圧が上昇する。従ってトランジスタQ
1のベース電圧が」1昇、トランジスタQ1のエミッタ
電圧も上昇する。そしてツェナーダイオードZ1のカソ
ード電圧も上昇する。
Now, if the cathode current 1k of the CRT increases, the voltage across the resistor R1 increases. Therefore transistor Q
The base voltage of transistor Q1 increases by 1, and the emitter voltage of transistor Q1 also increases. The cathode voltage of Zener diode Z1 also increases.

するとトランジスタQ2のベース電圧も上昇し、このト
ランジスタQ2のエミッタ電圧も上昇する。
Then, the base voltage of transistor Q2 also rises, and the emitter voltage of this transistor Q2 also rises.

これによりCRTのカソード電a I kが減り、安定
化される。
This reduces and stabilizes the cathode voltage a I k of the CRT.

[発明の効果] 以上説明したようにこの発明によれば、カッド電流の変
動の検出性能か良く、よって安定度を向ヒでき、しかも
簡単な構成で安全度も高いカソード電流安定化回路を得
る。
[Effects of the Invention] As explained above, according to the present invention, it is possible to obtain a cathode current stabilizing circuit that has good performance in detecting fluctuations in the cathode current, improves stability, and has a simple configuration and high safety. .

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

第1図はこの発明の一実施例を示すブロック図、第2図
は第1図のブロックを具体的に示す回路図、第3図は従
来のカソード電流安定化回路を示す図である。 11・・CRT (陰極線管)  12・・・高圧電源
回路、14・・・電流検出回路、15・・・電源回路、
16・・・基準電圧回路。 出願人代理人 弁理士 鈴江武彦 第3 口 第2IN
FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a circuit diagram specifically showing the blocks of FIG. 1, and FIG. 3 is a diagram showing a conventional cathode current stabilizing circuit. 11...CRT (cathode ray tube) 12...High voltage power supply circuit, 14...Current detection circuit, 15...Power supply circuit,
16...Reference voltage circuit. Applicant's agent Patent attorney Takehiko Suzue No. 3 No. 2 IN

Claims (1)

【特許請求の範囲】[Claims] 陰極線管のエージング装置において、陰極線管のカソー
ド電流を検出する手段と、この手段によって得られた検
出信号のレベルに応じて、上記カソード電流の検出ライ
ンを通じて該カソード電圧を制御しカソード電流を安定
化する制御回路とを具備したことを特徴とするカソード
電流安定化回路。
In a cathode ray tube aging device, the cathode current is stabilized by controlling the cathode voltage through the cathode current detection line according to a means for detecting a cathode current of the cathode ray tube and a level of a detection signal obtained by the means. 1. A cathode current stabilizing circuit comprising: a control circuit for controlling a cathode current;
JP63173722A 1988-07-14 1988-07-14 Cathode current stabilization circuit Expired - Lifetime JP2866655B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP63173722A JP2866655B2 (en) 1988-07-14 1988-07-14 Cathode current stabilization circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP63173722A JP2866655B2 (en) 1988-07-14 1988-07-14 Cathode current stabilization circuit

Publications (2)

Publication Number Publication Date
JPH0224934A true JPH0224934A (en) 1990-01-26
JP2866655B2 JP2866655B2 (en) 1999-03-08

Family

ID=15965930

Family Applications (1)

Application Number Title Priority Date Filing Date
JP63173722A Expired - Lifetime JP2866655B2 (en) 1988-07-14 1988-07-14 Cathode current stabilization circuit

Country Status (1)

Country Link
JP (1) JP2866655B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2021534415A (en) * 2018-08-22 2021-12-09 ロベルト・ボッシュ・ゲゼルシャフト・ミト・ベシュレンクテル・ハフツングRobert Bosch Gmbh A lidar sensor for optical capture of the visual field, an actuation device or vehicle equipped with a lidar sensor, and a method for optical capture of the visual field.

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20010035728A (en) * 1999-10-01 2001-05-07 박종섭 Auto control circuit for screen voltage

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61277136A (en) * 1985-05-30 1986-12-08 Toshiba Corp Raster ageing device for color picture tube

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61277136A (en) * 1985-05-30 1986-12-08 Toshiba Corp Raster ageing device for color picture tube

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2021534415A (en) * 2018-08-22 2021-12-09 ロベルト・ボッシュ・ゲゼルシャフト・ミト・ベシュレンクテル・ハフツングRobert Bosch Gmbh A lidar sensor for optical capture of the visual field, an actuation device or vehicle equipped with a lidar sensor, and a method for optical capture of the visual field.

Also Published As

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JP2866655B2 (en) 1999-03-08

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