JPH02100303A - Solenoid drive circuit - Google Patents

Solenoid drive circuit

Info

Publication number
JPH02100303A
JPH02100303A JP25416288A JP25416288A JPH02100303A JP H02100303 A JPH02100303 A JP H02100303A JP 25416288 A JP25416288 A JP 25416288A JP 25416288 A JP25416288 A JP 25416288A JP H02100303 A JPH02100303 A JP H02100303A
Authority
JP
Japan
Prior art keywords
solenoid
voltage
output
circuit
holding
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
JP25416288A
Other languages
Japanese (ja)
Inventor
Eiji Ikeda
池田 英治
Norio Hamada
浜田 徳郎
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.)
NEC Corp
Original Assignee
NEC 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 NEC Corp filed Critical NEC Corp
Priority to JP25416288A priority Critical patent/JPH02100303A/en
Publication of JPH02100303A publication Critical patent/JPH02100303A/en
Pending legal-status Critical Current

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Abstract

PURPOSE:To enable a device to be compact and heat design and packaging design to be easy by introducing a switch circuit intermittently when retaining the drive condition of a solenoid and then providing a chopping switch circuit for applying holding voltage to the solenoid. CONSTITUTION:While the output of an output port 1 becomes '1' and pulse is output from a one-shot circuit 2, the output of an AND circuit 5 becomes '1' continuously, a power transistor 6 conducts continuously, and power and voltage V0 is directly applied to a solenoid 7. Even if the pulse from the one- shot circuit 2 disappears, while the output from the output port 1 is '1', the pulse train from an oscillator 3 is output from the AND gate 5, the power transistor 6 conducts intermittently, and voltage applied to the solenoid 7 decreases to the holding voltage. Voltage for driving the solenoid is obtained without chopping after applying voltage to be applied to the solenoid and then chopping is performed. Thus, voltage for holding a drive condition of solenoid is obtained so that the circuit is superb in terms of heat design, cost, and packaging design.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、ソレノイドを駆動するソレノイド・ドライブ
回路に関し、特に書状区分機や光学文字読み取り装置に
おいて紙葉類を仕分けするための転てつ機を動作させる
ためのソレノイド・ドライブ回路に関する。
DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a solenoid drive circuit for driving a solenoid, and in particular to a switching machine for sorting paper sheets in a letter sorter or an optical character reader. Related to solenoid drive circuits for operating.

〔従来の技術〕[Conventional technology]

従来、この種のソレノイド・ドライブ回路は、第3図に
示す様に、ソレノイド11にサージ電流を流すためのダ
イオード12を接続し、加速転てつ用回路のトランジス
タ13と保持用回路のトランジスタ14を備えており、
保持用回路にはソレノイド11との間に直列にホーロー
抵抗15が接続されていて、ソレノイド11に加わる電
圧を制限していた。又、他のソレノイド・ドライブ回路
としては、加速転てつ用と保持用の2電源を持ち、これ
を切替えることによってソレノイドをドライブするもの
があった。
Conventionally, this type of solenoid drive circuit, as shown in FIG. 3, has a diode 12 connected to a solenoid 11 for causing a surge current to flow, and a transistor 13 in an accelerating point circuit and a transistor 14 in a holding circuit. It is equipped with
A hollow resistor 15 was connected in series between the holding circuit and the solenoid 11 to limit the voltage applied to the solenoid 11. Other solenoid drive circuits have two power sources, one for acceleration and one for holding, and drive the solenoid by switching between them.

〔発明が解決しようとする課題〕[Problem to be solved by the invention]

上述した従来のソレノイド・ドライブ回路には、以下の
欠点があった。抵抗による分圧によって保持電圧を得よ
うとする回路では、ソレノイドの立上げ速度を早くしよ
うとする程、ドライブ電圧との差が大きくなり、抵抗に
容量の大きなものを選択しなければならず、装置が小さ
いものは熱設計および実装設計が難しいと言う欠点があ
った。又、2電源を用いる回路は、電源ユニットの外形
寸法が大きくなり、かつ高価になると言う欠点があった
The conventional solenoid drive circuit described above has the following drawbacks. In a circuit that tries to obtain a holding voltage by voltage division using a resistor, the faster the solenoid startup speed is, the greater the difference from the drive voltage becomes, and the resistor must have a large capacitance. Small devices had the disadvantage that thermal design and packaging design were difficult. Further, the circuit using two power supplies has the disadvantage that the external dimensions of the power supply unit are large and the cost is high.

〔課題を解決するための手段〕[Means to solve the problem]

本発明のソレノイド・ドライブ回路は、ソレノイドと電
源の間に直列に接続されたスイッチ回路と、前記ソレノ
イドを駆動するときは前記スイッチ回路を連続的に導通
させて前記ソレノイドに駆動電圧を印加させ、前記ソレ
ノイドの駆動状態を保持するときは前記スイッチ回路を
断続的に導通させて前記ソレノイドに保持電圧を印加さ
せるチョッピング切換回路とを含んで構成される。
The solenoid drive circuit of the present invention includes a switch circuit connected in series between a solenoid and a power source, and when driving the solenoid, continuously conducts the switch circuit to apply a driving voltage to the solenoid. The device includes a chopping switching circuit that intermittently turns on the switch circuit to apply a holding voltage to the solenoid when maintaining the driving state of the solenoid.

〔実施例〕〔Example〕

次に、本発明について図面を参照して説明する。 Next, the present invention will be explained with reference to the drawings.

第1図において、1はCPUに接続されている出力ポー
ト、2はワンショット回路、3はオツシレータ、4はO
Rゲート、5はANDゲート、6はパワートランジスタ
である。7はソレノイドでパワートランジスタ6に直列
に接続されている。
In Figure 1, 1 is an output port connected to the CPU, 2 is a one-shot circuit, 3 is an oscillator, and 4 is an output port connected to the CPU.
5 is an AND gate, and 6 is a power transistor. A solenoid 7 is connected in series to the power transistor 6.

CPUから出力ポート1に°゛11パ力されると、この
出力がインバータ9、コンデンサ10を介してワンショ
ット回路2を動作させ、ワンショット回路2からソレノ
イド7を加速転てつするのに必要な時間幅のパルスが出
力される。オツシレータ3からは、ソレノイド7を保持
するのに必要な電流を流すため1:nのデユーティのパ
ルス列が出力される。例えば、ソレノイド7の保持電圧
がソレノイド7に加えられている電源電圧+VDの3分
の1であったとすると、オツシレータ3のパルス“H”
と“L”のデユーティは1:3となる。
When power is input from the CPU to output port 1, this output operates the one-shot circuit 2 via the inverter 9 and capacitor 10, and is necessary for the one-shot circuit 2 to accelerate the solenoid 7. A pulse with a certain time width is output. The oscillator 3 outputs a pulse train with a duty ratio of 1:n in order to flow the current necessary to hold the solenoid 7. For example, if the holding voltage of the solenoid 7 is one-third of the power supply voltage +VD applied to the solenoid 7, the oscillator 3 pulse “H”
The duty of "L" is 1:3.

ワンショット回路2とオツシレータ3の出力がORゲー
ト4で重ねられた後、出力ポート1の信号とANDゲー
ト5によりANDがとられ、ANDゲート5の出力がパ
ワートランジスタ6に加えられ、出力ポート1から“1
゛′が出力されている間、パワートランジスタ6によっ
てソレノイド7がドライブされる。
After the outputs of the one-shot circuit 2 and the oscillator 3 are superimposed by the OR gate 4, an AND is taken with the signal of the output port 1 by the AND gate 5, and the output of the AND gate 5 is added to the power transistor 6, and the output port 1 is From “1”
While '' is being output, the solenoid 7 is driven by the power transistor 6.

出力ポート1の出力が“1″になってからワンショット
回路2からパルスが出力されている間はAND回路5の
出力は連続的に“1″となっており、パワートランジス
タ6も連続的に導通し、ソレノイド7に電源、電圧vo
が直接印加される。
While the one-shot circuit 2 is outputting a pulse after the output of the output port 1 becomes "1", the output of the AND circuit 5 is continuously "1", and the power transistor 6 is also continuously output. Continuity, power to solenoid 7, voltage vo
is applied directly.

ワンショット回路2のパルスが消えてからでも出力ポー
ト1の出力が1′′の間はオツシレータ3のパルス列が
ANDゲート5から出力され、パワートランジスタ6が
断続的に導通し、ソレノイド7に印加される電圧は保持
電圧まで減少する。
Even after the pulse of the one-shot circuit 2 disappears, while the output of the output port 1 is 1'', the pulse train of the oscillator 3 is output from the AND gate 5, the power transistor 6 is intermittently conductive, and the pulse train is applied to the solenoid 7. voltage decreases to the holding voltage.

第2図には、出力ポート1の出力波形と、ワンショット
回路2の出力波形と、オツシレータ3の出力波形と、A
NDゲート5の出力波形と、ソレノイド7の電流波形を
示す。
FIG. 2 shows the output waveform of output port 1, the output waveform of one-shot circuit 2, the output waveform of oscillator 3, and the output waveform of A
The output waveform of the ND gate 5 and the current waveform of the solenoid 7 are shown.

パワートランジスタ6はソレノイド7の動作の保持中に
通常20KH2前後の周波数でオンとオフが繰返される
ため、ソレノイド7に接続されるダイオード8には繰返
しサージ電流が流れる。この繰返しサージ電流からダイ
オードの破壊を防ぐのは、複数のダイオード8を直列に
接続することにより達成出来る。
Since the power transistor 6 is repeatedly turned on and off at a frequency of about 20KH2 while the solenoid 7 is in operation, a surge current repeatedly flows through the diode 8 connected to the solenoid 7. Preventing damage to the diode from this repeated surge current can be achieved by connecting a plurality of diodes 8 in series.

〔発明の効果〕〔Effect of the invention〕

以上説明したように本発明は、ソレノイドに加える電圧
を印加直後はチョッピングしないことにより、ソレノイ
ドを駆動する電圧を得、その後チョッピングを行うこと
によりソレノイドの駆動状態を保持する電圧を得ること
ができ、熱設計、コスト面並びに実装設計の点で優れて
いる効果がある。
As explained above, in the present invention, by not chopping the voltage applied to the solenoid immediately after applying it, a voltage that drives the solenoid can be obtained, and by performing chopping after that, a voltage that maintains the driving state of the solenoid can be obtained. It has excellent effects in terms of thermal design, cost, and packaging design.

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

第1図および第2図はそれぞれ本発明の一実施例の回路
図および出力波形、第3図は従来のソレノイド・ドライ
ブ回路の回路図である。 1・・・出力ポート、2・・・ワンショット回路、3・
・・オツシレータ、4・・・ORゲート、5・・・AN
Dゲート、6・・・パワートランジスタ、7,11・・
・ソレノイド、8.12・・・サージ吸収用ダイオード
1 and 2 are a circuit diagram and output waveforms of an embodiment of the present invention, respectively, and FIG. 3 is a circuit diagram of a conventional solenoid drive circuit. 1... Output port, 2... One-shot circuit, 3...
...oscillator, 4...OR gate, 5...AN
D gate, 6...power transistor, 7, 11...
・Solenoid, 8.12...Surge absorption diode.

Claims (1)

【特許請求の範囲】[Claims]  ソレノイドと電源の間に直列に接続されたスイッチ回
路と、前記ソレノイドを駆動するときは前記スイッチ回
路を連続的に導通させて前記ソレノイドに駆動電圧を印
加させ、前記ソレノイドの駆動状態を保持するときは前
記スイッチ回路を断続的に導通させて前記ソレノイドに
保持電圧を印加させるチョッピング切換回路とを含むこ
とを特徴とするソレノイド・ドライブ回路。
A switch circuit connected in series between a solenoid and a power source, and when driving the solenoid, the switch circuit is continuously conducted to apply a driving voltage to the solenoid, and when maintaining the driving state of the solenoid. A solenoid drive circuit comprising: a chopping switching circuit that intermittently makes the switch circuit conductive to apply a holding voltage to the solenoid.
JP25416288A 1988-10-07 1988-10-07 Solenoid drive circuit Pending JPH02100303A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP25416288A JPH02100303A (en) 1988-10-07 1988-10-07 Solenoid drive circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP25416288A JPH02100303A (en) 1988-10-07 1988-10-07 Solenoid drive circuit

Publications (1)

Publication Number Publication Date
JPH02100303A true JPH02100303A (en) 1990-04-12

Family

ID=17261096

Family Applications (1)

Application Number Title Priority Date Filing Date
JP25416288A Pending JPH02100303A (en) 1988-10-07 1988-10-07 Solenoid drive circuit

Country Status (1)

Country Link
JP (1) JPH02100303A (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54158660A (en) * 1978-06-05 1979-12-14 Pioneer Electronic Corp Solenoid drive circuit

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54158660A (en) * 1978-06-05 1979-12-14 Pioneer Electronic Corp Solenoid drive circuit

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