JPH03251044A - Inrush-current preventive circuit - Google Patents
Inrush-current preventive circuitInfo
- Publication number
- JPH03251044A JPH03251044A JP4769690A JP4769690A JPH03251044A JP H03251044 A JPH03251044 A JP H03251044A JP 4769690 A JP4769690 A JP 4769690A JP 4769690 A JP4769690 A JP 4769690A JP H03251044 A JPH03251044 A JP H03251044A
- Authority
- JP
- Japan
- Prior art keywords
- ptc
- converter
- short
- fet
- circuit
- 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
- 230000003449 preventive effect Effects 0.000 title abstract 2
- 230000002265 prevention Effects 0.000 claims description 9
- 238000001514 detection method Methods 0.000 claims description 4
- 239000003990 capacitor Substances 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 2
- 230000007423 decrease Effects 0.000 description 1
Landscapes
- Emergency Protection Circuit Devices (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は突入電流防止回路に関し、特に直流電源の突入
電流防止回路に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an inrush current prevention circuit, and particularly to an inrush current prevention circuit for a DC power supply.
第２図は従来の突入電流防止回路を含む電源回路の回路
図である。FIG. 2 is a circuit diagram of a power supply circuit including a conventional inrush current prevention circuit.
電源１に接続される負荷（入力コンデンサ２゜補助電源
３．コンバータ４）と直列に電流制限用抵抗９が設けら
れ、抵抗９にはその両端の電圧を検出し補助電源３を駆
動する電圧検出器６と、補助電源３からの信号を受けて
抵抗９の両端を短絡するＦＥＴ７が並列に接続されてい
る。A current limiting resistor 9 is provided in series with the load connected to the power supply 1 (input capacitor 2, auxiliary power supply 3, converter 4), and the resistor 9 has a voltage detection function that detects the voltage across the resistor 9 and drives the auxiliary power supply 3. The FET 7 which receives a signal from the auxiliary power supply 3 and shorts both ends of the resistor 9 is connected in parallel to the resistor 6.
起動用スイッチ８を投入すると入力コンデンサ２と抵抗
９により作られる直列回路に電流が流れる。抵抗９では
時間の経過と共に端子間の電圧が次第に下がる。抵抗９
の端子間電圧が検出電圧に到達すると、電圧検出器６が
動作して補助型！３を駆動し、ＦＥＴ７によりコンバー
タ４と抵抗９を短絡する。When the start switch 8 is turned on, current flows through the series circuit formed by the input capacitor 2 and the resistor 9. The voltage between the terminals of the resistor 9 gradually decreases over time. resistance 9
When the voltage between the terminals of reaches the detection voltage, the voltage detector 6 operates and the auxiliary type! 3 is driven, and converter 4 and resistor 9 are short-circuited by FET 7.
上述した従来の突入電流防止回路は、コンバータに直列
に抵抗が設けられているので、コンバタが短絡事故を起
こすと抵抗が燃えるという欠点があり、またこれを防ぐ
ためにヒユーズ１ｏを使うと、部品が一点多くなるとい
う欠点がある。The conventional inrush current prevention circuit described above has a resistor installed in series with the converter, so it has the disadvantage that the resistor will burn out if the converter causes a short-circuit accident.Furthermore, if fuse 1o is used to prevent this, the components will be damaged. The disadvantage is that there is one more point.
本発明の目的は、コンバータの短絡障害での抵抗の焼損
をヒユーズなしで防止できる突入電流防止回路を提供す
ることである。SUMMARY OF THE INVENTION An object of the present invention is to provide an inrush current prevention circuit that can prevent resistor burnout due to a short-circuit failure in a converter without using a fuse.
本発明の突入電流防止回路は、
コンバータに直列に接続されたＰＴＣと、ＰＴＣの両端
の電位差を検出する電圧検出器とＰＴＣの両端を短絡す
るＰＴＣ短絡用ＦＥＴと電圧検出器の出力を入力し、Ｐ
ＴＣの両端の電位差が検出電圧に達すると、ＰＴＣ短絡
用ＦＥＴとコンバータを同時に駆動する補助電源とを有
している。The inrush current prevention circuit of the present invention inputs a PTC connected in series to a converter, a voltage detector that detects the potential difference between both ends of the PTC, a PTC shorting FET that shorts both ends of the PTC, and the output of the voltage detector. , P
It has an auxiliary power source that simultaneously drives the PTC shorting FET and the converter when the potential difference across the TC reaches a detection voltage.
（作用〕
コンバータが短絡障害を起こした場合、ＦＥＴの動作が
停止しくオンせず）、電源電圧がＰＴＣにかかるが、Ｐ
ＴＣの特性により抵抗値が増大し電流を止め、ＰＴＣの
焼損を防止する。(Function) If the converter causes a short-circuit failure, the FET will stop operating and will not turn on), and the power supply voltage will be applied to the PTC, but the
Due to the characteristics of TC, the resistance value increases, stopping the current and preventing burnout of the PTC.
次に、本発明の実施例について図面を参照して説明する
。Next, embodiments of the present invention will be described with reference to the drawings.
第１図は本発明の一実施例を示す、突入電流防止回路を
含む電源回路の回路図である。FIG. 1 is a circuit diagram of a power supply circuit including an inrush current prevention circuit, showing one embodiment of the present invention.
本実施例は、第２図の従来例における抵抗９の代りにＰ
ＴＣ（正特性サーミスタ）５が設けられている。In this embodiment, P is used instead of the resistor 9 in the conventional example shown in FIG.
A TC (positive characteristic thermistor) 5 is provided.
コンバータ４が短絡障害を起こした場合、ＦＥＴ７の動
作が停止しくオンせず）、電源電圧がＰＴＣ５にかかる
が、ＰＴＣ５の特性により抵抗値が増大し、電流Ｅ仁杓
、ＰＴＣ５の焼損を防止する。If the converter 4 has a short-circuit failure, the operation of the FET 7 will stop and it will not turn on), and the power supply voltage will be applied to the PTC 5, but due to the characteristics of the PTC 5, the resistance value will increase, and the current E will prevent the PTC 5 from burning out. .
以上説明したように本発明は、負荷に直列に電流制限用
ＰＴＣを設けることにより、コンバータの短絡障害での
抵抗の焼損をヒユーズなしで防止できる効果がある。As explained above, the present invention has the effect of preventing burnout of a resistor due to a short-circuit failure of the converter without using a fuse by providing a current limiting PTC in series with the load.
第１図は本発明の一実施例の突入電流防止回路を含む電
源回路の構成図、第２図は従来例の構成図である。
１・・・電源、 ２・・・入力コンデンサ、
３・・・補助電源、 ４・・・コンバータ、５・
・・ＰＴＣ，６・・・電圧検出器、７・・・ＰＴＣ短絡
用ＦＥＴ。
８・・・投入用スイッチ、
９・・・抵抗、
０・・・ヒユーズ。
電圧検出器
第
図
第
図FIG. 1 is a block diagram of a power supply circuit including an inrush current prevention circuit according to an embodiment of the present invention, and FIG. 2 is a block diagram of a conventional example. 1...Power supply, 2...Input capacitor,
3... Auxiliary power supply, 4... Converter, 5...
... PTC, 6... Voltage detector, 7... PTC short circuit FET. 8... Switch for closing, 9... Resistor, 0... Fuse. Voltage detector diagram diagram
Claims (1)
両端の電位差を検出する電圧検出器と、ＰＴＣの両端を
短絡するＰＴＣ短絡用ＦＥＴと、電圧検出器の出力を入
力し、ＰＴＣの両端の電位差が検出電圧に達すると、Ｐ
ＴＣ短絡用ＦＥＴとコンバータを同時に駆動する補助電
源とを有する突入電流防止回路。1. Input the output of the PTC connected in series to the converter, the voltage detector that detects the potential difference between both ends of the PTC, the PTC shorting FET that shorts both ends of the PTC, and the output of the voltage detector. When the potential difference reaches the detection voltage, P
An inrush current prevention circuit that has a TC short circuit FET and an auxiliary power supply that drives the converter at the same time.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4769690A JPH03251044A (en) | 1990-02-27 | 1990-02-27 | Inrush-current preventive circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4769690A JPH03251044A (en) | 1990-02-27 | 1990-02-27 | Inrush-current preventive circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH03251044A true JPH03251044A (en) | 1991-11-08 |
Family
ID=12782450
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4769690A Pending JPH03251044A (en) | 1990-02-27 | 1990-02-27 | Inrush-current preventive circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03251044A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1996023325A1 (en) * | 1995-01-23 | 1996-08-01 | Motorola Inc. | A bypass switching apparatus for a ptc protected battery and charger |
| GB2375902A (en) * | 2001-02-15 | 2002-11-27 | Univ Northumbria Newcastle | A hybrid fault current limiting and interrupting device |
| JP2009273228A (en) * | 2008-05-07 | 2009-11-19 | Panasonic Corp | Power unit and air conditioner having the same |
-
1990
- 1990-02-27 JP JP4769690A patent/JPH03251044A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1996023325A1 (en) * | 1995-01-23 | 1996-08-01 | Motorola Inc. | A bypass switching apparatus for a ptc protected battery and charger |
| GB2375902A (en) * | 2001-02-15 | 2002-11-27 | Univ Northumbria Newcastle | A hybrid fault current limiting and interrupting device |
| GB2375902B (en) * | 2001-02-15 | 2004-11-17 | Univ Northumbria Newcastle | A hybrid fault current limiting and interrupting device |
| JP2009273228A (en) * | 2008-05-07 | 2009-11-19 | Panasonic Corp | Power unit and air conditioner having the same |
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