JPH01278118A - Detecting circuit for power supply zero-volt cross point - Google Patents

Detecting circuit for power supply zero-volt cross point

Info

Publication number
JPH01278118A
JPH01278118A JP63108094A JP10809488A JPH01278118A JP H01278118 A JPH01278118 A JP H01278118A JP 63108094 A JP63108094 A JP 63108094A JP 10809488 A JP10809488 A JP 10809488A JP H01278118 A JPH01278118 A JP H01278118A
Authority
JP
Japan
Prior art keywords
power supply
switching element
cross point
turned
zero
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.)
Pending
Application number
JP63108094A
Other languages
Japanese (ja)
Inventor
Noriyasu Matsufuji
徳康 松藤
Shinji Kido
城戸 伸治
Norihisa Sagawa
典久 佐川
Hiroyuki Takahashi
廣之 高橋
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.)
Koki Holdings Co Ltd
Original Assignee
Hitachi Koki 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 Hitachi Koki Co Ltd filed Critical Hitachi Koki Co Ltd
Priority to JP63108094A priority Critical patent/JPH01278118A/en
Publication of JPH01278118A publication Critical patent/JPH01278118A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE:To improve the control accuracy and the reliability of a device which is controlled via a power supply zero-volt cross point by securing the detection of the zero-volt cross point of a sine wave AC waveform despite the distortion, etc., of an AC power supply waveform. CONSTITUTION:A fact the a switching element is turned off is not recognized for an optional time T1 and an OFF state of the switching element is recognized after the time T1 after the switching element is turned off at a level near the zero-volt of a sine wave AC power supply. Then the OFF state of the switching element is decided before its ON state. Thus the switching element is judged to be kept under an ON state even though it is turned off during an optional time T2 smaller than the zero-volt period of the sine wave AC power supply. Then the ON and OFF states of the switching element are identified again after the time T2. As a result, the zero-volt cross point of a sine wave power supply waveform can be detected despite the distortion, the crack and the superposition of an impulse wavering of the AC power supply waveform. Thus the control accuracy and the reliability can be improved for a device which utilizes a power supply zero-volt cross point.

Description

【発明の詳細な説明】 〔発明の利用分野〕 本発明は、商用電源等の交流波形のゼロボルトクロス点
検出回路に関するものである。
DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a zero volt cross point detection circuit for an AC waveform of a commercial power supply or the like.

〔発明の背景〕[Background of the invention]

電動機等の回転制御を行う場合、一般的にサイ+1スタ
をよく使用するが、サイリスタの位相制御を行う時には
、必ず電源、特に交流の商用電源のゼロボルトクロス点
を検出し、このゼロボルトクロス点を基にしてサイリス
クの点弧角を制御しなければならない。電源のゼロボル
トクロス点を検出する回路として第2図の様な回路を例
にとれば、商用電源1の交流電源を抵抗4及びホトカプ
ラ5内至6からなる回路に接続すると、ホトカプラ5及
び6が交番に0N10FFを繰り返し、その結果をホト
カプラ5及び6の出力段に出力する。
When controlling the rotation of an electric motor, etc., a thyristor is commonly used. When controlling the phase of a thyristor, it is necessary to detect the zero volt cross point of the power source, especially an AC commercial power source, and then detect this zero volt cross point. Based on this, the firing angle of the cyrisk must be controlled. Taking as an example a circuit as shown in Fig. 2 as a circuit for detecting the zero volt cross point of a power supply, when the AC power supply of the commercial power supply 1 is connected to the circuit consisting of the resistor 4 and the photocouplers 5 to 6, the photocouplers 5 and 6 0N10FF is repeated alternately, and the results are output to the output stages of photocouplers 5 and 6.

第6図の電源1に示す如く、ホトカプラ入力段のタイオ
ードがONする時の順方向電圧■以ヒの電圧が電源より
印加されると、ホトカプラ出力段のトランジスタはON
することになる。従って電源ゼロボルト点の時はホトカ
プラかOFFしている(入力段のダイオードに電流が流
オ!ず、出力段のトランジスタがOFFしている)時で
あり、この場合プルアップ抵抗7の電源電位が増幅器8
に入力され、増幅器8の出力信号(ZCR3)は、LO
W信号となり(第6図ZCR3信号参照)、CPU2は
電源ゼロボルト点であると認識できる。
As shown in power supply 1 in Figure 6, when the forward voltage when the diode of the photocoupler input stage is turned on is applied from the power supply, the transistor of the photocoupler output stage is turned on.
I will do it. Therefore, when the power supply is at zero volt point, the photocoupler is OFF (no current flows through the input stage diode, and the output stage transistor is OFF), and in this case, the power supply potential of the pull-up resistor 7 is amplifier 8
The output signal (ZCR3) of amplifier 8 is input to LO
The signal becomes W (see the ZCR3 signal in FIG. 6), and the CPU 2 can recognize that the power supply is at the zero volt point.

ここで第6図のように、交流波形のゼロボルト近傍A部
に歪みが生じたり、あるいはB部にインパルス状のひげ
が発生したりすると、ZCR3信号は不規則に割れを生
じ、サイリスク等の制御に悪影響をおよぼすことがある
Here, as shown in Figure 6, if distortion occurs in part A near zero volts of the AC waveform, or if impulse-like whiskers occur in part B, the ZCR3 signal will crack irregularly, causing control of syrisk etc. may have an adverse effect on the

第2図の様な回路においては、電源の歪み等により通常
の正弦波交流波形のゼロボルトクロス点検出をできない
欠点がある。
The circuit shown in FIG. 2 has the disadvantage that it cannot detect the zero volt cross point of a normal sine wave alternating current waveform due to power supply distortion or the like.

〔発明の目的〕[Purpose of the invention]

本発明の目的は、上記した従来技術の欠点をなくし、電
源ゼロボルトクロス点を用いて制御する装置の制御精度
向−ヒ、信頼性向ヒを図ることにある。
SUMMARY OF THE INVENTION An object of the present invention is to eliminate the above-mentioned drawbacks of the prior art and to improve the control accuracy and reliability of a device that is controlled using the zero-volt cross point of the power supply.

〔発明の概要〕[Summary of the invention]

本発明は、電源ゼロボルトクロス点の周期は。 In the present invention, the period of the power supply zero volt cross point is

b OHZ 4Cおいては10n+s、60H2では8
.3msである点、及び電源波形の歪み1割れ等は電源
ゼロボルトクロス点近傍に発生しやすい点に着目し、電
源ゼロボルトクロス点検出信号の幅及び周期に関して工
夫したものである。
b 10n+s for OHZ 4C, 8 for 60H2
.. The width and period of the power supply zero volt cross point detection signal were devised by paying attention to the point that it is 3 ms and the fact that distortion of the power supply waveform, such as 1-fraction, is likely to occur near the power supply zero volt cross point.

〔発明の実施例〕[Embodiments of the invention]

本発明となる電源ゼロボルトクロス点検出回路の具体的
一実施例を第1図に示す。また、第1図の回路の動作を
示すタイムチ今一トをha4図に示す。第1図において
、商用電源1.抵抗4及びホトカブラ5と6からなる回
路では、ホトカプラ5及び6の入力側ダイオードが0N
10FFするダイオード順方向電圧W以下の領域に、i
源ゼロボルトクロス点が含まれることになる。従ってホ
トカブラ5及び6の出力段トランジスタが0FFL。
A specific embodiment of the power supply zero volt cross point detection circuit according to the present invention is shown in FIG. Further, a time chart showing the operation of the circuit shown in FIG. 1 is shown in FIG. ha4. In FIG. 1, commercial power source 1. In a circuit consisting of resistor 4 and photocouplers 5 and 6, the input side diodes of photocouplers 5 and 6 are 0N.
i
The source zero volt cross point will be included. Therefore, the output stage transistors of photocoupler 5 and 6 are 0FFL.

ている時が電源ゼロボルトクロス点となる。電源ゼロボ
ルトクロス点の場合、プルアップ抵抗7から電源電位が
そのまま増幅器8に入力され、増幅器8の出力信号ZC
R3は、第4図に示す様にLOWレベル七なる。ZCR
3信号はインターバルタイマ6の出力Oを反転するNO
T素子組の出力15号とともにNOR素子9に入力され
、NOR素子9の出力1;!、インターバルタイマ3の
ゲート入力GOと、JK−7+1ツブフロツプ11のJ
及びに入力に取り込まれる。JK−7I+ツブフロツプ
11はプリセット端子Pを電源vCCに、またクリヤ端
子CLヲインターバルタイマ6の出力Oに接続している
。また、JK−7リツプフロツプ11のクロック入力C
子は、インターバル6の出力Qoに、さらに出力QはC
PU2のPort端子に接続されており、このCPU2
のPortにて電源ゼロボルトクロス点を認識すること
とする。問、インターバルタイマ6は発振回路ηからの
クロック信号をO、Cs端子に入力し、それぞれクロッ
ク数をカウントする。また、CPU2はアドレスバス、
データバス等にてインターバルタイマ3に接続されてい
The zero volt cross point of the power supply is when the voltage is on. In the case of the power supply zero volt cross point, the power supply potential is directly input to the amplifier 8 from the pull-up resistor 7, and the output signal ZC of the amplifier 8 is
R3 is at LOW level 7 as shown in FIG. ZCR
3 signal is NO which inverts the output O of interval timer 6.
It is input to the NOR element 9 together with the output No. 15 of the T element set, and the output 1 of the NOR element 9;! , gate input GO of interval timer 3 and J of JK-7+1 block flop 11.
and is taken into input. The JK-7I+ block flop 11 has a preset terminal P connected to the power supply VCC, and a clear terminal CL connected to the output O of the interval timer 6. Also, the clock input C of the JK-7 lip-flop 11
The child is the output Qo of interval 6, and the output Q is C
It is connected to the Port terminal of PU2, and this CPU2
The zero volt cross point of the power supply is recognized at the port. Q. The interval timer 6 inputs the clock signal from the oscillation circuit η to the O and Cs terminals, and counts the number of clocks, respectively. In addition, CPU2 has an address bus,
Connected to interval timer 3 via data bus, etc.

る。Ru.

第1回路にて電源ゼロボルトクロス点の検知を行う場合
、次の動作にてCPU2が認識する。まず、ZCR8信
号の立下りにインターバルタイマ6のαを立上げ、立上
げた時点から0端子にてクロックを規定数カウントする
。この場合のクロックの規定数を時間に換算して〕と定
義すると、インターバルタイマ6は出力αに対しGOが
立、Eつたと同時に出力00を立下げ、ηの間LOWを
保ち。
When the first circuit detects the zero volt cross point of the power supply, the CPU 2 recognizes it in the next operation. First, α of the interval timer 6 is raised at the falling edge of the ZCR8 signal, and from the time of rising, a specified number of clocks are counted at the 0 terminal. In this case, the specified number of clocks is converted into time and is defined as].The interval timer 6 lowers the output 00 at the same time as the GO goes up and goes to the output α, and keeps it LOW for the duration η.

η後再度HIGHに戻すワンショット動作を行うものと
する。
After η, a one-shot operation is performed in which the signal is returned to HIGH again.

Ooがn後立上ると同時にJK7リツプ70ツブ11の
出力QはLOWとなり、J及びに入力端子がHIGHに
なるまで、つまりZCR3信号がLOWからHIGHに
なるまでLOWを保持する。この出力QをCPU2はP
ort入力より入力し。
At the same time as Oo rises after n, the output Q of the JK7 lip 70 tube 11 becomes LOW and remains LOW until the input terminals J and 2 become HIGH, that is, until the ZCR3 signal changes from LOW to HIGH. The CPU 2 outputs this output Q as P
Input from ort input.

電源ゼロボルトクロス点を認識する。さらに、CPU2
は該出力Qの立上りを知ると同時にインターバルタイマ
6の出力01をLOWにし、LOWにした時点から01
端子にてクロックを規定数カウントする。この場合のク
ロックの規定数を時間に換算して−と定義すると、イン
ターバルタイマ3は出力O目ご対し、CPU2がLOW
を出力せよと指令を受けてから丑の間LOWを保ち、n
後再度HjGHI(iすこととする。すなわち、Oの反
転信号がZCR3信号とともにNOR素子9に入力され
るため、nの間はZCR3信号を無視する働きがある。
Recognize the power zero volt cross point. Furthermore, CPU2
At the same time as knowing the rise of the output Q, the output 01 of the interval timer 6 is set to LOW, and from the time it is set to LOW, the output 01 is changed to LOW.
Counts the specified number of clocks at the terminal. In this case, if the specified number of clocks is converted into time and defined as -, interval timer 3 corresponds to output O, and CPU 2 is LOW.
After receiving the command to output n, keep it LOW for a while.
After that, it is assumed that HjGHI(i) again. That is, since the inverted signal of O is input to the NOR element 9 together with the ZCR3 signal, the ZCR3 signal is ignored during n.

商用電源波形に割れ、歪み、インパlレス等が発生した
場合に対し、本発明となる第1図がどう動作するか、@
4図にて述べる。まず、Cのような割れが発生した場合
、この割れは前述インターバルタイマ3の出力01を1
間LOWに保持している時発生しているため、この割t
1による電源ゼロボルトクロスの現象は、通常の正弦波
の電源ゼロボルトクロスではないとし無視する。また、
Dの様に通常の正弦波ゼロクロス点近傍に2重クロスが
発生した場合、初めのゼロクロス点の方のみJ K−フ
リップフロップ11の出力Qは電源ゼロボルトクロス点
信号を出力しない(2重に電源ゼロボルトクロス点信号
を出力しない)。さらにEの様にパルス状のものが重畳
した場合、このパルスの幅がη、つまりインターバルタ
イマ6の出力αのLOW保持時間よりも短かければ、J
K−7+1ツブフロツプ11の出力Qには電源ゼロボル
トクロス点信号は生じない。周、前記インターバルタイ
マ6の出力01をLOWレベルに保持する時間Wは、正
弦波交流電源のゼロボルト周期よりも短い値である。
How does Fig. 1, which is the present invention, operate when cracks, distortion, impulse response, etc. occur in the commercial power supply waveform?
This is explained in Figure 4. First, if a crack like C occurs, this crack will cause the output 01 of the interval timer 3 to become 1.
This occurs when the t is held LOW for a while.
The power supply zero volt cross phenomenon caused by 1 is not a normal sine wave power supply zero volt cross and is ignored. Also,
When a double cross occurs near the normal sine wave zero cross point as shown in D, the output Q of the JK-flip-flop 11 does not output the power supply zero volt cross point signal (the power supply is doubled) only at the first zero cross point. (does not output zero volt cross point signal). Furthermore, when a pulse like E is superimposed, if the width of this pulse is shorter than η, that is, the LOW holding time of the output α of the interval timer 6, then J
No power supply zero volt cross point signal occurs at the output Q of the K-7+1 block flop 11. The time W for which the output 01 of the interval timer 6 is held at the LOW level is a value shorter than the zero volt cycle of the sine wave AC power supply.

Th(10ms   (50H2の場合)〈8.6ms
  (60H2の場合) 〔発明の効果〕 本発明によれば、交流電源波形に歪み、割、h、インパ
ルス波形等が重畳した場合でも1正弦波電源波形のゼロ
ボルトクロス点を検出することができるため、電源ゼロ
ボルトクロス点を利用している装置の制御精度向ヒ及び
信頼性の向上を図ることができる。
Th (10ms (for 50H2) <8.6ms
(For 60H2) [Effects of the Invention] According to the present invention, the zero volt cross point of a single sine wave power supply waveform can be detected even when distortion, split, h, impulse waveform, etc. are superimposed on the AC power supply waveform. Therefore, it is possible to improve the control accuracy and reliability of a device that utilizes the zero-volt cross point of the power supply.

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

第1図は本発明になる電源ゼロボルトクロス点検出回路
の一実施例を示す回路図、第2図はT源偲− ゼロボルトクロス点検出回路の従来技術の回路、第6図
は第2図の回路におけるタイムチ脅−ト。 第4図は本発明の回路におけるタイムチャートである。 1は商用電源、2はCPU、6はインターバルタイマ、
4は抵抗、5及び6はホトカプラ、7はプルアップ抵抗
、8は増幅器、9はNOR素子。 10はNOT素子、11はJK−フリップ70ツブ、1
2は発振回路である。
FIG. 1 is a circuit diagram showing an embodiment of the power supply zero volt cross point detection circuit according to the present invention, FIG. 2 is a circuit diagram of a prior art zero volt cross point detection circuit according to the present invention, and FIG. Time check threat in circuit. FIG. 4 is a time chart in the circuit of the present invention. 1 is a commercial power supply, 2 is a CPU, 6 is an interval timer,
4 is a resistor, 5 and 6 are photocouplers, 7 is a pull-up resistor, 8 is an amplifier, and 9 is a NOR element. 10 is NOT element, 11 is JK-Flip 70 tube, 1
2 is an oscillation circuit.

Claims (1)

【特許請求の範囲】[Claims] 正弦波交流電源の電圧レベルまたは電流量を測定または
検出し、該電圧レベルまたは電流量の大きさに応じてス
イッチングする素子を有する電気回路において、該正弦
波交流電源のゼロボルト近傍で該スイッチング素子がO
FFした後、任意の時間時T_1の間、スイッチング素
子がOFFしたことを認識せず、T_1後スイッチング
素子がOFFしていることを認識し、該スイッチング素
子がONするまでの間OFFであると判断し、該スイッ
チング素子がON後、前記正弦波交流電源のゼロボルト
周期よりも短い任意の時間T_2の間は、該スイッチン
グ素子がOFFしてもONのままと判断し、T_2後再
度該スイッチング素子のON、OFF状態を識別する機
能を備え、前記正弦波交流電源のゼロボルト点を検出す
ることを特徴とした電源ゼロボルトクロス点検出回路。
In an electric circuit having an element that measures or detects the voltage level or current amount of a sine wave AC power source and switches according to the magnitude of the voltage level or current amount, the switching element is activated near zero volts of the sine wave AC power source. O
After being turned off, the device does not recognize that the switching element is turned off for an arbitrary time T_1, and after T_1 it recognizes that the switching element is turned off, and assumes that it is turned off until the switching element is turned on. After the switching element is turned ON, it is determined that the switching element remains ON for an arbitrary time period T_2 shorter than the zero volt cycle of the sine wave AC power supply, even if the switching element is turned OFF, and after T_2, the switching element is turned ON again. A power supply zero volt cross point detection circuit, characterized in that it has a function of identifying ON and OFF states of the power supply, and detects a zero volt point of the sine wave AC power supply.
JP63108094A 1988-04-30 1988-04-30 Detecting circuit for power supply zero-volt cross point Pending JPH01278118A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP63108094A JPH01278118A (en) 1988-04-30 1988-04-30 Detecting circuit for power supply zero-volt cross point

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP63108094A JPH01278118A (en) 1988-04-30 1988-04-30 Detecting circuit for power supply zero-volt cross point

Publications (1)

Publication Number Publication Date
JPH01278118A true JPH01278118A (en) 1989-11-08

Family

ID=14475719

Family Applications (1)

Application Number Title Priority Date Filing Date
JP63108094A Pending JPH01278118A (en) 1988-04-30 1988-04-30 Detecting circuit for power supply zero-volt cross point

Country Status (1)

Country Link
JP (1) JPH01278118A (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5761329A (en) * 1980-09-30 1982-04-13 Matsushita Electric Works Ltd Zero crossing signal detection circuit
JPS5961329A (en) * 1982-09-30 1984-04-07 Fujitsu Ltd Cryptic communicating system

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5761329A (en) * 1980-09-30 1982-04-13 Matsushita Electric Works Ltd Zero crossing signal detection circuit
JPS5961329A (en) * 1982-09-30 1984-04-07 Fujitsu Ltd Cryptic communicating system

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