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JPH0453161A - Static electricity protective circuit - Google Patents

Static electricity protective circuit

Info

Publication number
JPH0453161A
JPH0453161A JP15747990A JP15747990A JPH0453161A JP H0453161 A JPH0453161 A JP H0453161A JP 15747990 A JP15747990 A JP 15747990A JP 15747990 A JP15747990 A JP 15747990A JP H0453161 A JPH0453161 A JP H0453161A
Authority
JP
Japan
Prior art keywords
static electricity
diodes
switch
power supply
resistor
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
JP15747990A
Other languages
Japanese (ja)
Inventor
Keiji Nagamine
永峰 啓二
Morizo Suda
須田 盛三
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric 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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP15747990A priority Critical patent/JPH0453161A/en
Publication of JPH0453161A publication Critical patent/JPH0453161A/en
Pending legal-status Critical Current

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  • Semiconductor Integrated Circuits (AREA)
  • Insulated Gate Type Field-Effect Transistor (AREA)

Abstract

PURPOSE:To reduce cost while making static electricity easy to escape by providing a resistor, which is connected between a connection point of two diodes connected serially in the same direction and a switch, and an input circuit while having a different power supply system from the diodes. CONSTITUTION:One piece each of diodes 5 and 6 are provided between a switch 1 and power supply 8 and 9, and a resistor 10 is provided between a contact point between the diodes 5,6,and an input circuit 7. Static electricity from the switch 1 escapes to the diodes 5 and 6 having low impedance than to a resistance path 10 having high inpedance. Then, since power supply V is surrounded by things, which absorb static electricity or the like such as capacitors, static electricity travels power supply lines 8 and 9 to be absorbed by the power supply V. Accordingly, destruction of an input circuit due to static electricity of human body to be impressed at the time of operating the switch 1 can be prevented while reducing cost. Further, Since there is no resistor between the switch 1 and the diodes 5, 6, static electricity or the like is easy to escape.

Description

【発明の詳細な説明】 [産業上の利用分野] この発明は、スイッチを操作したときに、印加される人
体の静電気による入力回路(集積回路)の破壊を防止す
るための静電気保護回路に関するものである。
[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an electrostatic protection circuit for preventing damage to an input circuit (integrated circuit) due to static electricity applied to a human body when a switch is operated. It is.

[従来の技術] 従来例の構成を第2図を参照しながら説明する。[Conventional technology] The configuration of a conventional example will be explained with reference to FIG.

第2図は、従来の静電気保護用の装置を示す斜視図であ
る。
FIG. 2 is a perspective view of a conventional electrostatic protection device.

第2図において、従来の静電気保護用の装置は、複数の
スイッチ(1,)の表面等を覆うような断面がL字状の
静電気誘導金属板(2)から構成されている。
In FIG. 2, the conventional electrostatic protection device is composed of an electrostatic induction metal plate (2) having an L-shaped cross section and covering the surfaces of a plurality of switches (1, ).

プラスチックのモールド品などで作られているスイッチ
(1)では、人体が触れたときに、静電気が入力回路の
内部に流れてそのエネルギーでゲートを破壊していた。
When the switch (1), which is made of a plastic molded product, is touched by a human body, static electricity flows into the input circuit and the energy destroys the gate.

そこで、この従来例においては、スイッチ(1)に触れ
たときに、人体のn電気が静電気誘導金属板(2)に逃
げるようになっている。
Therefore, in this conventional example, when the switch (1) is touched, n electricity from the human body escapes to the static electricity induction metal plate (2).

他の従来例の構成を第3図を参照しながら説明する。The configuration of another conventional example will be explained with reference to FIG.

第3図は、例えば実開昭63−174462号に示され
た従来の静電気保護回路を示す回路図である。
FIG. 3 is a circuit diagram showing a conventional electrostatic protection circuit disclosed in, for example, Japanese Utility Model Application No. 63-174462.

第3図において、従来の静電気保護回路は、入力端子(
3)に一端が接続された抵抗器(4)と、カソードが電
源Vに接続されかつアノードが抵抗器(4)の他端に接
続されたダイオード(5)と、カソードがダイオード(
5)のアノード及び抵抗器(4)の他端に接続されかつ
アノードが接地されたダイオード(6)とから構成され
ている。
In Figure 3, the conventional electrostatic protection circuit has an input terminal (
3), a diode (5) whose cathode is connected to the power supply V and whose anode is connected to the other end of the resistor (4), and a diode (5) whose cathode is connected to the diode (3).
5) and a diode (6) connected to the other end of the resistor (4) and whose anode is grounded.

なお、入力回路(7)の入力側はダイオード(5)及び
(6)の接続点に接続されている。
Note that the input side of the input circuit (7) is connected to the connection point of the diodes (5) and (6).

この他の従来例においては、静電気等のサージが入力さ
れると、ダイオード(5)及びく6)の整流特性によっ
てそのサージは入力回路(7)に入る前に外部へ逃がさ
れる。
In this other conventional example, when a surge such as static electricity is input, the rectifying characteristics of the diodes (5) and (6) cause the surge to escape to the outside before entering the input circuit (7).

[発明が解決しようとする課題] 前述したような従来の静電気保護用の装置では、コスト
がかかり、また従来の静電気保護回路では、ダイオード
の前段に抵抗器を入れているので、静電気等が逃げにく
いという問題点があった。
[Problems to be solved by the invention] Conventional static electricity protection devices such as those described above are costly, and in conventional static electricity protection circuits, a resistor is inserted in front of a diode, so static electricity, etc. cannot escape. The problem was that it was difficult.

この発明は、前述した問題点を解決するためになされた
もので、コストの低減が図れるとともに、静電気等を逃
げ易くすることができる静電気保護回路を得ることを目
的とする。
This invention was made to solve the above-mentioned problems, and aims to provide an electrostatic protection circuit that can reduce costs and make it easier for static electricity to escape.

[課題を解決するための手段コ この発明に係る静電気保護回路は、次に掲げる手段を備
えたものである。
[Means for Solving the Problems] The electrostatic protection circuit according to the present invention includes the following means.

〔1〕 同一方向に直列接続されその接続点がスイッチ
に接続された2個のダイオード。
[1] Two diodes connected in series in the same direction and their connection point connected to a switch.

〔2〕 前記接続点と入力回路との間に接続された抵抗
器。
[2] A resistor connected between the connection point and the input circuit.

[作用] この発明においては、2個のダイオードによって、スイ
ッチからの静電気が電源に逃がされる。
[Function] In this invention, static electricity from the switch is released to the power source by the two diodes.

また、抵抗器によって、静電気が入力回路に入るのが防
止される。
The resistor also prevents static electricity from entering the input circuit.

[実施例コ この発明の実施例の構成を第1図を参照しながら説明す
る。
[Embodiment] The structure of an embodiment of the present invention will be described with reference to FIG.

第1図は、この発明の一実施例を示す回路図である。FIG. 1 is a circuit diagram showing an embodiment of the present invention.

第1図において、この発明の一実施例は、カソードが電
源V(直流安定化電源)の正端子に電源線(8)を介し
て接続されたダイオード(5)と、カソードがダイオー
ド(5)のアノードに接続されかつアノードが電源Vの
負端子に電源線(9)を介して接続されたダイオード(
6)と、一端がダイオード(5)及び(6)の接続点に
接続された抵抗器(10)とから構成されている。
In FIG. 1, one embodiment of the present invention includes a diode (5) whose cathode is connected to the positive terminal of a power supply V (DC stabilized power supply) via a power supply line (8), and a diode (5) whose cathode is connected to the positive terminal of a power supply V (DC stabilized power supply) via a power supply line (8). A diode (
6), and a resistor (10) whose one end is connected to the connection point of the diodes (5) and (6).

なお、デイツプスイッチ等のスイッチ(1)の一端はダ
イオード(5)及び(6)の接続点に接続され、他端は
電源Vの負端子に接続されている。
Note that one end of the switch (1), such as a dip switch, is connected to the connection point of the diodes (5) and (6), and the other end is connected to the negative terminal of the power source V.

また、集積回路等からなる入力回路(7)は、入力側が
抵抗器(10)の他端に接続され、電源■には電源線(
12)及び(13)を介して接続され、かつ入力側と電
源Vの正端子との間に抵抗器(11)が接続されている
。なお、抵抗器(10)及び(11)の抵抗値R3及び
R2にはつぎの関係がある。R2> R スイッチ(1)からの静電気は、インピーダンスの高い
抵抗器く10)よりも、インピーダンスの低いダイオー
ド(5)及び(6)へ逃げる。そして、電源Vの回りに
はコンデンサ等の静電気等を吸収するものがあるので、
電源線(8)及び(9)をつたわって電源Vに吸収され
る。抵抗器(11)は、入力回路(7)の電位を確定す
るために挿入されている。
In addition, the input circuit (7) consisting of an integrated circuit etc. has its input side connected to the other end of the resistor (10), and the power supply line (
12) and (13), and a resistor (11) is connected between the input side and the positive terminal of the power supply V. Note that the resistance values R3 and R2 of the resistors (10) and (11) have the following relationship. R2>R Static electricity from the switch (1) escapes to the low impedance diodes (5) and (6) rather than the high impedance resistor 10). Also, there are things around the power supply V that absorb static electricity, such as capacitors, so
It is absorbed by the power supply V through the power supply lines (8) and (9). A resistor (11) is inserted to determine the potential of the input circuit (7).

この発明の一実施例・は、前述したように、スイッチ(
1)と電源線(8)及び(9)との間にダイオード(5
)及び(6)を1個づつ設け、さらに、ダイオード(5
)及び(6)の接続点と入力回路(7〉との間に抵抗器
(10)を設けているので、スイッチ(1)を操作した
ときに、印加される人体の静電気による入力゛回路の破
壊を防止することができるという効果を奏する。また、
従来に比べてコストを低減することができる。さらに、
スイッチ(1)とダイオードく5)及び(6)との間に
抵抗器がないので、静電気等が逃げ易いという効果を奏
する。
An embodiment of the present invention is, as described above, a switch (
A diode (5) is connected between the power line (8) and (9)
) and (6), and furthermore, a diode (5
) and (6) and the input circuit (7), so when the switch (1) is operated, the static electricity applied to the human body will not affect the input circuit. It has the effect of being able to prevent destruction.Also,
Costs can be reduced compared to conventional methods. moreover,
Since there is no resistor between the switch (1) and the diodes 5) and (6), the effect is that static electricity and the like can easily escape.

[発明の効果] この発明は、以上説明したとおり、同一方向に直列接続
されその接続点がスイッチに接続された2個のダイオー
ドと、前記接続点と入力回路との間に接続された抵抗器
とを備え、前記2個のダイオードと前記入力回路の電源
線が別系統であるので、コストの低減が図れるとともに
、静電気等を逃げ易くすることができるという効果を奏
する。
[Effects of the Invention] As explained above, the present invention comprises two diodes connected in series in the same direction and whose connection point is connected to a switch, and a resistor connected between the connection point and an input circuit. Since the power supply lines for the two diodes and the input circuit are separate systems, it is possible to reduce costs and make it easier for static electricity to escape.

【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回路図、第2図は従
来の静電気保護用の装置を示す斜視図、第3図は他の従
来の静電気保護回路を示す回路図である。 図において、 (1) ・・・ スイッチ、 く5  ・・・ ダイオード、 (6・・・ ダイオード、 (7・・・ 入力回路、 (8・・・ 電源線、 (9・・・ 電源線、 (10) ・・・ 抵抗器、 (11) ・・・ 抵抗器、 (12) ・・・ 電源線、 (13) ・・・ 電源線である。 なお、各図中、同一符号は同一、又は相当部分を示す。
FIG. 1 is a circuit diagram showing an embodiment of the present invention, FIG. 2 is a perspective view showing a conventional electrostatic protection device, and FIG. 3 is a circuit diagram showing another conventional electrostatic protection circuit. In the figure, (1)... Switch, 5... Diode, (6... Diode, (7... Input circuit, (8... Power line, (9... Power line, ( 10) ... Resistor, (11) ... Resistor, (12) ... Power line, (13) ... Power line. In each figure, the same symbols are the same or equivalent. Show parts.

Claims (1)

【特許請求の範囲】[Claims]  同一方向に直列接続されその接続点がスイッチに接続
された2個のダイオード、及び前記接続点と入力回路と
の間に接続された抵抗器を備え、前記2個のダイオード
と前記入力回路の電源線が別系統であることを特徴とす
る静電気保護回路。
comprising two diodes connected in series in the same direction and whose connection point is connected to a switch, and a resistor connected between the connection point and an input circuit, the power supply for the two diodes and the input circuit; An electrostatic protection circuit characterized by a separate line.
JP15747990A 1990-06-18 1990-06-18 Static electricity protective circuit Pending JPH0453161A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15747990A JPH0453161A (en) 1990-06-18 1990-06-18 Static electricity protective circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15747990A JPH0453161A (en) 1990-06-18 1990-06-18 Static electricity protective circuit

Publications (1)

Publication Number Publication Date
JPH0453161A true JPH0453161A (en) 1992-02-20

Family

ID=15650579

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15747990A Pending JPH0453161A (en) 1990-06-18 1990-06-18 Static electricity protective circuit

Country Status (1)

Country Link
JP (1) JPH0453161A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7430103B2 (en) 2003-09-19 2008-09-30 Sharp Kabushiki Kaisha Static electricity protective circuit and high-frequency circuit apparatus incorporating the same

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS613442A (en) * 1984-06-15 1986-01-09 Nec Corp semiconductor equipment
JPS61128556A (en) * 1984-11-27 1986-06-16 Mitsubishi Electric Corp Diode for surge protection
JPH02836B2 (en) * 1981-06-25 1990-01-09 Sumitomo Electric Industries

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02836B2 (en) * 1981-06-25 1990-01-09 Sumitomo Electric Industries
JPS613442A (en) * 1984-06-15 1986-01-09 Nec Corp semiconductor equipment
JPS61128556A (en) * 1984-11-27 1986-06-16 Mitsubishi Electric Corp Diode for surge protection

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7430103B2 (en) 2003-09-19 2008-09-30 Sharp Kabushiki Kaisha Static electricity protective circuit and high-frequency circuit apparatus incorporating the same

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