JPS61196770A - Protecting circuit of capacitor discharging circuit - Google Patents
Protecting circuit of capacitor discharging circuitInfo
- Publication number
- JPS61196770A JPS61196770A JP3634085A JP3634085A JPS61196770A JP S61196770 A JPS61196770 A JP S61196770A JP 3634085 A JP3634085 A JP 3634085A JP 3634085 A JP3634085 A JP 3634085A JP S61196770 A JPS61196770 A JP S61196770A
- Authority
- JP
- Japan
- Prior art keywords
- turned
- resistor
- circuit
- capacitor
- transistor
- 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
Links
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/06—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes without control electrode or semiconductor devices without control electrode
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Protection Of Static Devices (AREA)
- Rectifiers (AREA)
- Control Of Voltage And Current In General (AREA)
Abstract
Description
【発明の詳細な説明】
〔発明の利用分野〕
本発明は電子機器の電源部に係り、特にパワーオン中の
消費電力を削減し効率を上げるのに好適なコンデンサの
放電回路に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a power supply section of an electronic device, and particularly to a capacitor discharge circuit suitable for reducing power consumption during power-on and increasing efficiency.
電子機器内のコンデンサの放電抵抗は元来機器の動作に
は関係のないもので、保守の際の・安全のために設けら
れている。コンデンサの放電時間はＵＬ等の安全規格に
規定があり、コンデンサが大容量の場合知は抵抗値な小
さく選ばなければならず、その損失が非常に大きくなる
。The discharge resistance of a capacitor in an electronic device is not originally related to the operation of the device, but is provided for maintenance and safety purposes. The discharging time of a capacitor is regulated by safety standards such as UL, and if the capacitor has a large capacity, the resistance value must be selected to be low, resulting in a very large loss.
そこでパワーオフの状態の場合のみ抵抗を接続して損失
を減らし、抵抗の容量も小さくしようとする考え方があ
り１例えば特開昭５７−９２６４号公報、Ｉ￥ｆ開昭開
明−１１２８８５号公報、特開昭５６−１４８１７７号
公報等に示されている。しかし、これらは抵抗を断続す
るスイッチ素子がショートしたとき、抵抗に連続パワー
がかかつてしまう問題については考慮されていなかった
。Therefore, there is a concept of connecting a resistor only in the power-off state to reduce the loss and reduce the capacitance of the resistor. This is disclosed in Japanese Patent Application Laid-open No. 148177/1983. However, these do not take into account the problem that continuous power is applied to the resistor when the switching element that connects the resistor is short-circuited.
本発明の目的は、電子機器がパワーオフの状態の場合の
みに１機器内のコンデンサに放電抵抗を接続することに
よって放電抵抗の容量を小さくシ、小形化する回路にお
いて、放電抵抗を制御するスイッチ素子の故障の場合、
異常を確実に検出する保護回路を提供することにある。An object of the present invention is to reduce the capacity of a discharge resistor by connecting a discharge resistor to a capacitor in one device only when the electronic device is in a power-off state, thereby reducing the size of the circuit. In case of element failure,
The object of the present invention is to provide a protection circuit that reliably detects abnormalities.
スイッチ素子の故障の場合１問題となるのは抵抗の異常
加熱であり、従来はサーモスタット等の温度検出素子等
が使用されていたが１回路の電圧が高く、実装等の問題
があった。そこで本発明では抵抗に流れる電流を簡略に
検出するようにしてこの問題を解決したものである。In the case of a failure of a switch element, one problem is abnormal heating of the resistor. Conventionally, temperature detection elements such as thermostats have been used, but the voltage of one circuit is high and there are problems with mounting. Therefore, the present invention solves this problem by simply detecting the current flowing through the resistor.
以下１本発明の一実施例を第１図により説明する。第１
図において、交流電源ｌの電圧を継電器２を閉じること
によって整流器３とコンデンサ４より成る整流平滑回路
に加えて整流平滑を行う。。An embodiment of the present invention will be described below with reference to FIG. 1st
In the figure, by closing a relay 2, the voltage of an AC power source 1 is applied to a rectifying and smoothing circuit consisting of a rectifier 3 and a capacitor 4, and rectifying and smoothing is performed. .
１５は補助電源である。継電器２を閉じる動作は次のよ
うに行われる。すなわち、先ずパワースイッチ１４を閉
じる。初期状態では５ＣＲ１２はオフ状態となっている
ので、パワースイッチ１４を閉じたことにより抵抗２５
を通じてツェナーダイオード１３とトランジスタ１１の
ベースエミッタに電流が流れる。するとトランジスタ１
１はオンとなり、継電器２が閉じる。またトランジスタ
１１がオンとなることによって抵抗１８を通じてフォト
カプラ８とｌＯに電流が流れそれぞれオンとなる。15 is an auxiliary power source. The operation of closing the relay 2 is performed as follows. That is, first, the power switch 14 is closed. In the initial state, 5CR12 is in the off state, so when the power switch 14 is closed, the resistor 25
A current flows through the Zener diode 13 and the base emitter of the transistor 11. Then transistor 1
1 is turned on and relay 2 is closed. Further, when the transistor 11 is turned on, a current flows through the resistor 18 to the photocoupler 8 and lO, and each of them is turned on.
フォトカプラ８がオンとなることにより、トランジスタ
７はカットオフし、フォトカプラ９はオンとはならない
。従ってＮＯＲゲート２２０２つの入力Ａ、Ｂはロー及
びノ・イとなってその出力はローであり、５ＣＲ１２は
オフのままである。従ってパワースイッチ１４を閉じて
パワーオンしても、コンデンサ４に接続されるのは抵抗
６のみである。抵抗６は非常に大きい値を選べるので、
これによる損失はごくわずかである。When the photocoupler 8 is turned on, the transistor 7 is cut off and the photocoupler 9 is not turned on. Therefore, the two inputs A, B of NOR gate 220 are low and NO, and its output is low, and 5CR12 remains off. Therefore, even if the power switch 14 is closed and the power is turned on, only the resistor 6 is connected to the capacitor 4. Resistor 6 can be chosen to have a very large value, so
The losses caused by this are negligible.
次にパワースイッチ１４を開くと、トランジスタ１１が
オフとなり、継電器２及びフォトカプラ８゜１０もオフ
となる。これによって交流電源１は整流回路から切り離
され、またフォトカプラ８のオフによってトランジスタ
７はオンとなって抵抗５によりコンデンサ４の電荷の放
電がなされる。抵抗５の通電時間は継電器２がオフとな
っているため、コンデンサの電荷が残っている間・ ３
・
だけなので、抵抗値は小さくても容量は少なくてすむ。Next, when the power switch 14 is opened, the transistor 11 is turned off, and the relay 2 and photocoupler 8.degree. 10 are also turned off. As a result, the AC power supply 1 is disconnected from the rectifier circuit, and the transistor 7 is turned on by turning off the photocoupler 8, so that the electric charge in the capacitor 4 is discharged by the resistor 5. Since the relay 2 is off, the energization time of the resistor 5 is as long as the charge in the capacitor remains.
・ Since it is only , the capacitance can be small even if the resistance value is small.
トランジスタ７０オンによって７オトカプラ９がオンと
なり、ＮＯＲゲート２２の入力Ａ、Ｂはハイ、ローとな
ってその出力はローのままで５ＣＲ１２はオンとならな
い。When the transistor 70 is turned on, the 7-coupler 9 is turned on, and the inputs A and B of the NOR gate 22 become high and low, and the output remains low, and the 5CR12 is not turned on.
以上が通常の場合の動作である。次に、異常が発生した
場合の動作を説明する。The above is the normal operation. Next, the operation when an abnormality occurs will be explained.
パワースイッチ１４を閉じて継電器２がオンとなり６回
路全体がオンとなっているとき、トランジスタ７は前記
の説明によってオフとなっているはずであるが、これが
ショート事故でオンとなってしまったとする。この場合
、抵抗５に電流が流れ続けるようになる。抵抗５は前述
の゛ ように短時間定格として容量を小さくするのが目
的であるから電流が流れ続けるのは好ましくない。そこ
で７オトカプラ９を設けてこれを保護する。すなわち、
抵抗５に電流が流れるとフォトカプラ９がオンとなり、
ＮＯＲゲートの入力Ａ、Ｂがいずれもローとなり、その
出力としてハイが出て、５ＣＲ１２がトリガされる。こ
れ・ ４ ・
によってトランジスタエ１はオフとなり継電器２がオフ
となって電源断となる。When the power switch 14 is closed and the relay 2 is turned on, and the entire 6 circuits are turned on, the transistor 7 should be turned off according to the above explanation, but suppose that it is turned on due to a short circuit accident. . In this case, current continues to flow through the resistor 5. As mentioned above, the purpose of the resistor 5 is to reduce the capacitance as a short-time rating, so it is undesirable for current to continue flowing. Therefore, a 7-otoko coupler 9 is provided to protect this. That is,
When current flows through resistor 5, photocoupler 9 turns on,
The inputs A and B of the NOR gate both go low, and the output goes high, triggering 5CR12. As a result of this, the transistor 1 is turned off, the relay 2 is turned off, and the power is cut off.
本発明によれば、電子機器がパワーオフの状態の場合の
みに４機器内のコンデンサに放電抵抗を接続することｋ
よって放電抵抗の容量を小さくシ、小形化する回路にお
いて、放電抵抗を制御するスイッチ素子の故障の場合、
異常を確実に検出でき、抵抗の焼損等を防止できる効果
がある。According to the present invention, a discharge resistor can be connected to the capacitors in four devices only when the electronic devices are in a power-off state.
Therefore, in a circuit where the capacitance of the discharge resistor is reduced and the circuit is miniaturized, in the case of a failure of the switch element that controls the discharge resistor,
This has the effect of being able to reliably detect abnormalities and preventing burnout of the resistor.
【図面の簡単な説明】
第１図は本発明の一実施例を示す回路図である。
１・・・交流電源、 ２・・・継電器、３・・・
整流器、 ４・・・コンデンサ。
７・・・トランジスタ、 ８・・・フォトカブ・う。
９・・・フォトカプラ、 １０・・・フォトカプラ
。
１１・・・トランジスタ、１２・・・サイリスタ。
１３・・・ツェナーダイオード。
１４・・・パワースイッチ、１５・・・補助電源。
１６・・・ダイオード、 １９・・・コンデンサ
。
２２・・・ＮＯＲゲート。BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a circuit diagram showing an embodiment of the present invention. 1... AC power supply, 2... Relay, 3...
Rectifier, 4... Capacitor. 7...Transistor, 8...Photocub. 9...Photocoupler, 10...Photocoupler. 11...Transistor, 12...Thyristor. 13... Zener diode. 14...Power switch, 15...Auxiliary power supply. 16...Diode, 19...Capacitor. 22...NOR gate.
Claims (1)
オフ状態の場合のみに抵抗を接続する放電回路において
、前記電子機器をパワーオフする手段と、前記抵抗を流
れる電流を検出する手段と、前記電子機器のパワーオン
状態を検出する手段とを備え、前記電子機器がパワーオ
ン状態であってかつ前記抵抗に電流が流れた場合に前記
電子機器をパワーオフとすることを特徴とするコンデン
サ放電回路の保護回路。1. In a discharge circuit in which a resistor is connected to a capacitor in an electronic device only when the electronic device is in a power-off state, means for powering off the electronic device, means for detecting a current flowing through the resistor, and the A capacitor discharging circuit comprising: means for detecting a power-on state of an electronic device, and powers off the electronic device when the electronic device is in the power-on state and current flows through the resistor. protection circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3634085A JPS61196770A (en) | 1985-02-27 | 1985-02-27 | Protecting circuit of capacitor discharging circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3634085A JPS61196770A (en) | 1985-02-27 | 1985-02-27 | Protecting circuit of capacitor discharging circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS61196770A true JPS61196770A (en) | 1986-08-30 |
Family
ID=12467097
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3634085A Pending JPS61196770A (en) | 1985-02-27 | 1985-02-27 | Protecting circuit of capacitor discharging circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61196770A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106849021A (en) * | 2017-03-17 | 2017-06-13 | 深圳市禾望电气股份有限公司 | Semiconductor switch over-current detecting method and current transformer |
-
1985
- 1985-02-27 JP JP3634085A patent/JPS61196770A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106849021A (en) * | 2017-03-17 | 2017-06-13 | 深圳市禾望电气股份有限公司 | Semiconductor switch over-current detecting method and current transformer |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JPH10191639A (en) | Method for protecting resistor for preventing inrush current | |
| US5637980A (en) | Battery charging/discharging switching control protective circuit | |
| EP0477367B1 (en) | Device for preventing inrush current from flowing into electric apparatus | |
| US6600668B1 (en) | Crowbar circuit for low output voltage DC/DC converters | |
| JP2000201429A (en) | Overvoltage protection circuit | |
| JPS62285615A (en) | Ac circuit breaker | |
| JPH06245485A (en) | Inverter device | |
| JP2004505359A (en) | Mode switching power supply control | |
| JPS61196770A (en) | Protecting circuit of capacitor discharging circuit | |
| TW417321B (en) | Charging and discharging control circuit and charging type power supply device | |
| JP3565054B2 (en) | Inverter device protection method | |
| JPH06133445A (en) | Power supply system | |
| JP2981410B2 (en) | Power supply | |
| EP3503394B1 (en) | Discharge circuit for capacitor | |
| JPH0531788Y2 (en) | ||
| JPS60237873A (en) | Controller of elevator | |
| JPS6139823A (en) | Rush current preventing circuit | |
| KR930008136Y1 (en) | Power circuit | |
| KR910004023Y1 (en) | Over current protective circuit | |
| JP3048502B2 (en) | Inrush current prevention circuit | |
| JPH07326278A (en) | Cable way abnormality alarming device, and wiring breaker having cable way abnormality alarming function | |
| KR0107819Y1 (en) | Power source device with overvoltage input prevention circuits | |
| JPS60176467A (en) | Power converter | |
| JPH04331473A (en) | Power converter having abnormality detecting mechanism | |
| JPH0993452A (en) | Protective circuit for television receiver |