JPS6042496Y2 - Shock noise prevention circuit - Google Patents
Shock noise prevention circuitInfo
- Publication number
- JPS6042496Y2 JPS6042496Y2 JP1977023444U JP2344477U JPS6042496Y2 JP S6042496 Y2 JPS6042496 Y2 JP S6042496Y2 JP 1977023444 U JP1977023444 U JP 1977023444U JP 2344477 U JP2344477 U JP 2344477U JP S6042496 Y2 JPS6042496 Y2 JP S6042496Y2
- Authority
- JP
- Japan
- Prior art keywords
- time constant
- charging
- circuit
- turned
- discharging
- 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
Links
Landscapes
- Noise Elimination (AREA)
- Circuits Of Receivers In General (AREA)
- Amplifiers (AREA)
Description
【考案の詳細な説明】
この考案は、種々の電子機器において、電源オン・オフ
時及び信号切換スイッチの切換動作時に発生するショッ
クノイズを防止するためのショックノイズ防止回路を提
供することを目的とするものである。[Detailed description of the invention] The purpose of this invention is to provide a shock noise prevention circuit for preventing shock noise that occurs when power is turned on/off and when a signal changeover switch is switched in various electronic devices. It is something to do.
以下この考案の構成及び動作を図面に基づいて説明する
。The configuration and operation of this invention will be explained below based on the drawings.
第１図はこの考案の一実施例を示す回路図で、１は電子
機器（増幅器、ＦＭ受信機等）、２は複数の入力信号の
いずれか１つを選択するための切換スイッチ、３は出力
端子、４は電源スィッチ、５は電子機器１の電源回路、
６は電源回路５の電源立上り時定数より大きな充電時定
数及び電源立下り時定数より小さな時定数で変化する充
放電電圧を得る充放電回路、７はスイッチングトランジ
スタ、８はリレー、８ａはリレー接点、９は切換スイッ
チと連動して切換スイッチ２の切換動作時を含む所定時
間の間、オンするスイッチである。FIG. 1 is a circuit diagram showing an embodiment of this invention, in which 1 is an electronic device (amplifier, FM receiver, etc.), 2 is a changeover switch for selecting one of a plurality of input signals, and 3 is a circuit diagram showing an embodiment of this invention. Output terminal, 4 is a power switch, 5 is a power circuit for electronic equipment 1,
6 is a charging/discharging circuit that obtains a charging/discharging voltage that changes with a charging time constant larger than the power supply rise time constant and a time constant smaller than the power supply fall time constant of the power supply circuit 5; 7 is a switching transistor; 8 is a relay; 8a is a relay contact , 9 are switches that are turned on for a predetermined period of time including the switching operation of the changeover switch 2 in conjunction with the changeover switch.
充放電回路６は抵抗６ａｔ ６ｂｔ ６ｃ、コンデ
ンサ６ｄｔ ６ｅｔ ６ｆ、ダイオード６ｇ、６ｈで構
成されている。The charging/discharging circuit 6 is composed of resistors 6at, 6bt, 6c, capacitors 6dt, 6et, 6f, and diodes 6g, 6h.
以上のような構成において、まず電源スィッチ４をオン
すると、電源回路５の電源電圧は所定の時定数で立ち上
って定常値に達し電子機器１を動作させる。In the above configuration, when the power switch 4 is first turned on, the power supply voltage of the power supply circuit 5 rises with a predetermined time constant and reaches a steady value, causing the electronic device 1 to operate.
しかしながら充放電回路６の充電電圧は電源回路５の電
源時定数より大きな時定数、すなわち抵抗６ｂ、６ｃ及
びコンデンサ６ｅ、６ｆよりなる２つの時定数回路で決
まる時定数で上昇するため、電源スィッチ４のオン時、
所定時間の間、トランジスタ７がオフ状態を保ち、リレ
ー８は動作せずリレー接点８ａがオフ状態のままとなる
。However, the charging voltage of the charging/discharging circuit 6 rises with a time constant larger than the power supply time constant of the power supply circuit 5, that is, with a time constant determined by two time constant circuits consisting of resistors 6b, 6c and capacitors 6e, 6f. When on,
For a predetermined period of time, transistor 7 remains off, relay 8 does not operate, and relay contact 8a remains off.
したがって、電源回路５の電源電圧が定常値に達するま
でに発生するショックノイズは出力端子３に現われない
。Therefore, shock noise generated until the power supply voltage of the power supply circuit 5 reaches a steady value does not appear at the output terminal 3.
また電源回路５の電源電圧が定常値に達した後、所定値
まで上昇した充放電回路６の充電電圧、すなわちコンデ
ンサ６ｆの充電電圧によってトランジスタ７がオン状態
となり、リレー８が動作リレー接点８ａがオン状態とな
って、出力端子３には出力信号が得られる。Further, after the power supply voltage of the power supply circuit 5 reaches a steady value, the charging voltage of the charging/discharging circuit 6 that has risen to a predetermined value, that is, the charging voltage of the capacitor 6f, turns on the transistor 7, and the relay 8 is activated.The relay contact 8a is turned on. It is in the on state and an output signal is obtained at the output terminal 3.
次に電源スィッチ４をオフすると、充放電回路６の充電
電圧は電源回路５の電源時定数より小さい時定数すなわ
ちコンデンサ６ｅ、６ｆの充電電圧がダイオード６ｇｔ
６ｈを介して放電する時の時定数で減少するため、電源
オフ後すぐにトランジスタ７はオフ状態となり、リレー
８が非動作となってリレー接点８ａが開く。Next, when the power switch 4 is turned off, the charging voltage of the charging/discharging circuit 6 has a time constant smaller than the power supply time constant of the power supply circuit 5, that is, the charging voltage of the capacitors 6e and 6f is changed to the diode 6gt.
Since the time constant decreases when discharging through 6h, the transistor 7 is turned off immediately after the power is turned off, the relay 8 becomes inactive, and the relay contact 8a opens.
したがって、電源オフ時電源回路５の電源電圧が零にな
るまでに電子機器１中に発生するショックノイズは出力
端子３に現われない。Therefore, the shock noise generated in the electronic device 1 does not appear at the output terminal 3 until the power supply voltage of the power supply circuit 5 becomes zero when the power is turned off.
次に、電源オン後の定常状態において入力信号を選択す
るために切換スイッチを切換えると、それと連動してス
イッチ９が切換スイッチ２の切換動作時を含む所定時間
の間のみオン状態となり、コンデンサ６ｆの充電電圧が
スイッチ９を介して瞬時に放電される。Next, when the changeover switch is changed over to select an input signal in a steady state after the power is turned on, the switch 9 is turned on only for a predetermined time including the switching operation of the changeover switch 2, and the capacitor 6f The charging voltage is instantly discharged via switch 9.
そして切換スイッチ２の切換動作が完了した後スイッチ
９がオン状態からオフ状態に戻ると、コンデンサ６ｆの
充電電圧は抵抗６ｃ及びコンデンサ６ｆで決まる時定数
で上昇し元の状態に復帰する。When the switch 9 returns from the on state to the off state after the switching operation of the changeover switch 2 is completed, the charging voltage of the capacitor 6f increases with a time constant determined by the resistor 6c and the capacitor 6f, and returns to the original state.
したがって、トランジスタ７は切換スイッチ２の切換動
作時所定時間の間オフ状態となり、リレー８が非動作状
態となってリレー接点が開く。Therefore, the transistor 7 is turned off for a predetermined period of time when the changeover switch 2 is switched, and the relay 8 is turned off and the relay contact is opened.
よって、切換スイッチ２の切換動作時に発生するショッ
クノイズも出力端子には現われない。Therefore, the shock noise generated during the switching operation of the changeover switch 2 does not appear at the output terminal.
なお、切換スイッチ２の切換動作時のショックノイズを
防止するための出力信号線路遮断時間は抵抗６ｃとコン
デンサ６ｆのみで決まる時定数で決定されるので、電源
オン時のショックノイズを防止するための出力信号線路
遮断時間とは無関係に適宜に設定することができる。Note that the output signal line cut-off time to prevent shock noise during the switching operation of the changeover switch 2 is determined by a time constant determined only by the resistor 6c and capacitor 6f. It can be set as appropriate regardless of the output signal line cutoff time.
第２図は第１図におけるスイッチ９の具体的構成例を示
すものである。FIG. 2 shows a specific example of the configuration of the switch 9 in FIG. 1.
第２図において、１ｏは接点１０ａ、１０ｂ及び接片１
０ｃを有するメイク・ビフォア・ブレイク型スイッチで
第１図の切換スイッチ２と速動するものであり、接片１
０ｃは十Ｂ電源に接続され、接点１０ａ、１０ｂはそれ
ぞれ抵抗１１．１２を介してトランジスタ１３のベース
に接続されている。In Fig. 2, 1o indicates contacts 10a, 10b and contact piece 1.
It is a make-before-break type switch with 0c and operates quickly like the changeover switch 2 in Fig. 1, and the contact piece 1
0c is connected to a 10B power supply, and contacts 10a and 10b are connected to the base of a transistor 13 via resistors 11 and 12, respectively.
トランジスタ１３のベースは抵抗１４を介して−Ｂ電源
に接続され、エミッタはアースされ、コレクタは第１図
のトランジスタ７のベースに接続されている。The base of the transistor 13 is connected to the -B power supply via the resistor 14, the emitter is grounded, and the collector is connected to the base of the transistor 7 shown in FIG.
すなわち第２図に示した構成全体が第１図のスイッチ９
と等価な動作を行なうものである。In other words, the entire configuration shown in FIG. 2 is the switch 9 in FIG.
It performs the equivalent operation.
の構成においては第１図の切換スイッチ２の切換動作時
、それと連動するスイッチ１０の接片１０ｃが接点１０
ａ、１０ｂの両方に接触している間のみトランジスタ１
３がオン状態となる。In the configuration shown in FIG. 1, when the changeover switch 2 in FIG.
Transistor 1 only while in contact with both a and 10b
3 is turned on.
以上述べたように、この考案によれば、電源オン・オフ
時及び信号切換スイッチの切換動作時に発生するショッ
クノイズを共に完全に防止することができる。As described above, according to this invention, it is possible to completely prevent shock noise that occurs when the power is turned on and off and when the signal changeover switch is switched.
また、信号切換スイッチの切換動作時のショックノイズ
防止のための出力信号線路遮断時間は、電源オン時のシ
ョックノイズ防止のための出力信号線路遮断時間とは無
関係に適宜に選ぶことができる。Further, the output signal line cutoff time for preventing shock noise during the switching operation of the signal changeover switch can be appropriately selected regardless of the output signal line cutoff time for preventing shock noise when the power is turned on.
第１図はこの考案の一実施例を示す回路図、第２図は第
１図における要部の具体的構成例である。
１・・・・・・電子機器、２・・・・・・切換スイッチ
、３・・・・・・出力端子、４・・・・・・電源スィッ
チ、５・・・・・・電源回路、６・・・・・・充放電回
路、７・・・・・・スイッチングトランジスタ、８・・
・・・・リレー、８ａ・・・・・・リレ接点、９・・・
・・・スイッチ。FIG. 1 is a circuit diagram showing one embodiment of this invention, and FIG. 2 is a specific example of the configuration of the main parts in FIG. 1. 1... Electronic equipment, 2... Changeover switch, 3... Output terminal, 4... Power switch, 5... Power circuit, 6... Charge/discharge circuit, 7... Switching transistor, 8...
...Relay, 8a...Relay contact, 9...
···switch.
Claims (1)
続し、電源オン時の電源時定数より大きな充電時定数及
び電源オフ時の電源時定数より小さい放電時定数で変化
する充放電電圧を得る充放電回路と、複数の入力信号の
いずれか１つを選択するための切換スイッチの切換動作
と連動して上記充放電回路中の１つの時定数回路のコン
デンサを放電動作させる手段と、上記充放電回路よりの
充放電電圧によってオン・オフ動作するスイッチングト
ランジスタと、該スイッチングトランジスタのオン・オ
フ動作によって制御され、電源オン時から所定時間の間
及び電源オフ時と同時にかつ上記切換スイッチの切換動
作時を含む所定時間の間、出力信号線路を遮断するリレ
ーとを具備して成るショックノイズ防止回路。A charging/discharging method in which two time constant circuits consisting of a resistor and a capacitor are connected in series to obtain a charge/discharge voltage that changes with a charging time constant that is larger than the power supply time constant when the power is turned on and a discharge time constant that is smaller than the power supply time constant when the power is turned off. a circuit, means for discharging a capacitor of one time constant circuit in the charging/discharging circuit in conjunction with a switching operation of a changeover switch for selecting any one of the plurality of input signals, and the charging/discharging circuit. It is controlled by the on/off operation of the switching transistor, which is turned on and off depending on the charging and discharging voltage of A shock noise prevention circuit comprising: a relay that interrupts an output signal line for a predetermined period of time.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1977023444U JPS6042496Y2 (en) | 1977-02-28 | 1977-02-28 | Shock noise prevention circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1977023444U JPS6042496Y2 (en) | 1977-02-28 | 1977-02-28 | Shock noise prevention circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS53118444U JPS53118444U (en) | 1978-09-20 |
| JPS6042496Y2 true JPS6042496Y2 (en) | 1985-12-27 |
Family
ID=28860063
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1977023444U Expired JPS6042496Y2 (en) | 1977-02-28 | 1977-02-28 | Shock noise prevention circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6042496Y2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS631452Y2 (en) * | 1979-03-12 | 1988-01-14 |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4924517A (en) * | 1972-06-29 | 1974-03-05 |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5239874Y2 (en) * | 1972-05-16 | 1977-09-09 |
-
1977
- 1977-02-28 JP JP1977023444U patent/JPS6042496Y2/en not_active Expired
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4924517A (en) * | 1972-06-29 | 1974-03-05 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS53118444U (en) | 1978-09-20 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US3559072A (en) | Electronic shut-off timers | |
| US3870905A (en) | Switching circuit | |
| JPS6042496Y2 (en) | Shock noise prevention circuit | |
| US4323789A (en) | Sequencer for power supply voltages | |
| US3846648A (en) | Solid-state timer switch providing ac power to a load for a predetermined time after a main source of power is removed | |
| JPS6339162B2 (en) | ||
| JPS5921554Y2 (en) | Instant return type delay circuit | |
| JPS6010117Y2 (en) | AFT control circuit | |
| JPS5910829Y2 (en) | AM-FM switching circuit | |
| KR810000274Y1 (en) | Audio muting circuit | |
| JPS5811077Y2 (en) | switching circuit | |
| JPS6025152Y2 (en) | muting circuit | |
| JPS5837134Y2 (en) | muting circuit | |
| US3549906A (en) | Control circuit responsive to positive or negative transient signal or to power supply voltage decrease to fire scr | |
| US3509361A (en) | Timer circuit | |
| JPS6025153Y2 (en) | Muting signal generation circuit | |
| JPS6332283B2 (en) | ||
| JPS5811055Y2 (en) | audio transmitting circuit | |
| JPS635296Y2 (en) | ||
| JPS6336277Y2 (en) | ||
| JPS5813634Y2 (en) | Muting signal generation circuit | |
| JPS6025157Y2 (en) | Amplification switching device | |
| JPS6042498Y2 (en) | Muting signal generation circuit | |
| JPS5915147Y2 (en) | Malfunction prevention device for digital frequency display device with built-in clock | |
| JPS5826850B2 (en) | Astable multivibrator |