JPH06284571A - Rush current prevention circuit - Google Patents
Rush current prevention circuitInfo
- Publication number
- JPH06284571A JPH06284571A JP5068254A JP6825493A JPH06284571A JP H06284571 A JPH06284571 A JP H06284571A JP 5068254 A JP5068254 A JP 5068254A JP 6825493 A JP6825493 A JP 6825493A JP H06284571 A JPH06284571 A JP H06284571A
- Authority
- JP
- Japan
- Prior art keywords
- relay
- soft start
- power
- resistor
- current
- 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.)
- Withdrawn
Links
Landscapes
- Direct Current Feeding And Distribution (AREA)
- Control Of Voltage And Current In General (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、電子機器の突入電流防
止回路に係り、特にソフトスタート用リレーに励磁動作
不良が発生した際、ソフトスタート抵抗の焼損を防止す
るために電源を切断する安全回路を備えた突入電流防止
回路に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inrush current prevention circuit for electronic equipment, and more particularly to a safety for cutting off a power source in order to prevent burnout of a soft start resistor when a malfunction of excitation occurs in a soft start relay. The present invention relates to an inrush current prevention circuit including a circuit.
【０００２】[0002]
【従来の技術】電子機器の電源には、電圧安定化のため
に容量性負荷が接続されており、電源投入時に容量性負
荷を充電するために、定常通電時の数倍の突入電流が流
れる。従来の電子機器には、ソフトスタート抵抗とソフ
トスタート用リレーにより、電源投入時の突入電流を抑
制するようにしたものがある。2. Description of the Related Art A capacitive load is connected to a power source of an electronic device for voltage stabilization, and in order to charge the capacitive load when the power source is turned on, an inrush current several times as large as that in the steady energization flows. . Some conventional electronic devices use a soft start resistor and a soft start relay to suppress an inrush current when the power is turned on.
【０００３】従来より用いられている突入電流防止回路
を図４に示す。図４において、１は直流電源、２は電源
投入用スイッチ、３は電源投入用リレー、６はソフトス
タート用リレー、７はソフトスタート抵抗、８は容量性
負荷、９はその他の負荷である。電源投入用リレー３，
ソフトスタート用リレー６等の直流リレーの動作電圧
は、一般に直流電源１の電圧値の０．８倍程度である。A conventionally used inrush current prevention circuit is shown in FIG. In FIG. 4, 1 is a DC power supply, 2 is a power-on switch, 3 is a power-on relay, 6 is a soft start relay, 7 is a soft start resistor, 8 is a capacitive load, and 9 is another load. Power-on relay 3,
The operating voltage of a DC relay such as the soft start relay 6 is generally about 0.8 times the voltage value of the DC power supply 1.
【０００４】突入電流防止回路の動作は図５に示す通り
であり、電源投入用スイッチ２がオンすると、電源投入
用リレー３がオンし、ソフトスタート抵抗７を通して負
荷に電流が流れる。この時、負荷電流Ｉｓ（Ａ）の最大
値は、電源電圧をＶｓ（Ｖ）、ソフトスタート抵抗の抵
抗値をＲｓ（Ω）とすると、Ｉｓ＝Ｖｓ／Ｒｓ（Ａ）の
値に抑えられる。Ａ点の電位がソフトスタート用リレー
６の動作電圧（約Ｖｓ×０．８）になった時、すなわち
突入電流を抑制するに十分な時間が経過した時、ソフト
スタート用リレー６がオンし、ソフトスタート抵抗７の
端子間が短絡されて定常通電状態となる。The operation of the inrush current prevention circuit is as shown in FIG. 5, and when the power-on switch 2 is turned on, the power-on relay 3 is turned on and a current flows to the load through the soft start resistor 7. At this time, the maximum value of the load current Is (A) is suppressed to a value of Is = Vs / Rs (A), where Vs (V) is the power supply voltage and Rs (Ω) is the resistance value of the soft start resistor. When the potential at the point A reaches the operating voltage (about Vs × 0.8) of the soft start relay 6, that is, when a time sufficient to suppress the inrush current elapses, the soft start relay 6 turns on, The terminals of the soft start resistor 7 are short-circuited to enter a steady energized state.
【０００５】[0005]
【発明が解決しようとする課題】一般に、ソフトスター
ト抵抗は短時間しか通電されないため、連続通電定格の
数分の一の容量のものが選ばれる。したがって、従来の
突入電流防止回路ではソフトスタート用リレー６に励磁
動作不良が発生し、ソフトスタート抵抗７が連続通電状
態になると、ソフトスタート抵抗７は発熱のために焼損
してしまうという問題があった。Generally, since the soft start resistor is energized for only a short time, a capacitor having a capacity which is a fraction of the continuous energization rating is selected. Therefore, in the conventional inrush current prevention circuit, when the soft-start relay 6 becomes defective in the excitation operation and the soft-start resistor 7 is continuously energized, there is a problem that the soft-start resistor 7 is burned due to heat generation. It was
【０００６】本発明の目的は、ソフトスタート用リレー
６に励磁動作不良が発生した際ソフトスタート抵抗７の
焼損を防止するために、電源を切断する安全回路を備え
た突入電流防止回路を提供することにある。An object of the present invention is to provide an inrush current prevention circuit provided with a safety circuit for cutting off the power supply in order to prevent the soft start resistor 7 from being burnt out when the soft start relay 6 has a defective excitation operation. Especially.
【０００７】[0007]
【課題を解決するための手段】上記目的は、図１のごと
く、電源投入用リレー３のコイルに電流を供給するため
のコイル電流供給用コンデンサ４と、電源投入用スイッ
チ２と連動して動作するコイル電流供給用スイッチ５
と、２接点を持ったソフトスタート用リレー６とを用
い、電源投入後、突入電流を抑制するのに十分な時間経
過後、ソフトスタート用リレー６が動作しない場合、電
源投入用リレー３がオフするように突入電流防止回路を
構成することにより達成される。As shown in FIG. 1, the above-mentioned object operates in conjunction with a coil current supply capacitor 4 for supplying a current to a coil of a power-on relay 3 and a power-on switch 2. Switch 5 for supplying coil current
If the soft start relay 6 does not operate after a sufficient time for suppressing the inrush current after the power is turned on by using the soft start relay 6 having two contacts, and the power start relay 3 is turned off. This is achieved by configuring the inrush current prevention circuit as described above.
【０００８】[0008]
【作用】上記のように構成された突入電流防止回路で
は、電源投入後、突入電流を抑制するのに十分な時間経
過後、ソフトスタート用リレー６が動作しない場合、電
源投入用リレー３のコイル電流は、コイル電流供給用コ
ンデンサ４からのみ供給されるため、コイル電流供給用
コンデンサ４の電荷は時間の経過と共に減少し、コイル
電流供給用コンデンサ４の端子電圧がソフトスタート用
リレー６の開放電圧（約Ｖｓ×０．１）以下となり、電
源投入用リレー３が自動的にオフする。したがって、ソ
フトスタート用リレー６に励磁動作不良が発生した場合
も、ソフトスタート抵抗７に連続通電されることがな
く、焼損の恐れがない。In the inrush current prevention circuit configured as described above, when the soft start relay 6 does not operate after a sufficient time has passed to suppress the inrush current after the power is turned on, the coil of the power on relay 3 is Since the current is supplied only from the coil current supply capacitor 4, the charge of the coil current supply capacitor 4 decreases with the passage of time, and the terminal voltage of the coil current supply capacitor 4 is the open voltage of the soft start relay 6. (About Vs × 0.1) or less, the power-on relay 3 is automatically turned off. Therefore, even when the soft-start relay 6 has a defective excitation operation, the soft-start resistor 7 is not continuously energized, and there is no risk of burning.
【０００９】[0009]
【実施例】以下、本発明の実施例を図面を参照して説明
する。本発明による突入電流防止回路を図１に示す。図
１において、１は直流電源、２は電源投入用スイッチ、
３は電源投入用リレー、４は電源投入用リレー３のコイ
ル電流を供給するコイル電流供給用コンデンサ、５は電
源投入用スイッチ２と連動して動作するコイル電流供給
用スイッチ、６は２接点を持つソフトスタート用リレ
ー、７はソフトスタート抵抗、８は容量性負荷、９はそ
の他の負荷である。Embodiments of the present invention will be described below with reference to the drawings. The inrush current prevention circuit according to the present invention is shown in FIG. In FIG. 1, 1 is a DC power supply, 2 is a power-on switch,
3 is a power-on relay, 4 is a coil current supply capacitor for supplying coil current of the power-on relay 3, 5 is a coil current supply switch which operates in conjunction with the power-on switch 2, and 6 is a two-contact The soft start relay has, 7 is a soft start resistor, 8 is a capacitive load, and 9 is another load.
【００１０】突入電流防止回路の動作は図２に示す通り
であり、上記電源投入用スイッチ２の接点をＣ側に倒す
と、電源投入用リレー３のコイルにコイル電流供給用コ
ンデンサ４が接続され、コイル電流供給用コンデンサ４
に蓄えられていた電荷により、Ｃ点の電位が電源投入用
リレー３の動作電圧（約Ｖｓ×０．８）以上となり、電
源投入用リレー３がオンし、ソフトスタート抵抗７を通
して負荷に電流が流れる。この時、コイル電流供給用ス
イッチ５は電源投入用スイッチ２と連動して動作するた
め、閉じている。また、コイル電流供給用コンデンサ４
の容量は、電源投入後、突入電流を抑制するのに十分な
時間、コイル電流供給用コンデンサ４の端子電圧が電源
投入用リレー３の開放電圧（約Ｖｓ×０．１）以上の電
圧を維持できる容量を選択する。The operation of the inrush current prevention circuit is as shown in FIG. 2, and when the contact of the power-on switch 2 is turned to the C side, the coil current supply capacitor 4 is connected to the coil of the power-on relay 3. , Coil current supply capacitor 4
Due to the electric charge stored at the point C, the potential at point C exceeds the operating voltage (about Vs × 0.8) of the power-on relay 3, the power-on relay 3 turns on, and a current flows to the load through the soft start resistor 7. Flowing. At this time, the coil current supply switch 5 operates in conjunction with the power-on switch 2 and is therefore closed. Also, the coil current supply capacitor 4
The capacity of is maintained at a voltage equal to or higher than the open voltage (about Vs × 0.1) of the power-on relay 3 for a sufficient time to suppress the inrush current after the power is turned on. Select the capacity that can be used.
【００１１】電源電流Ｉｓ（Ａ）の最大値は、従来回路
と同様、Ｉｓ＝Ｖｓ／Ｒｓ（Ａ）の値に抑えられる。Ａ
点の電位がソフトスタート用リレー６の動作電圧（約Ｖ
ｓ×０．８）になった時、すなわち突入電流を抑制する
のに十分な時間が経過した時、ソフトスタート用リレー
６がオンし、ソフトスタート抵抗７の端子間が短絡され
ると共に電源投入用リレー３のコイルに電流が供給さ
れ、定常通電状態となる。The maximum value of the power supply current Is (A) is suppressed to a value of Is = Vs / Rs (A), as in the conventional circuit. A
The potential at the point is the operating voltage of the soft start relay 6 (about V
s × 0.8), that is, when a time sufficient to suppress the inrush current has elapsed, the soft start relay 6 is turned on, the terminals of the soft start resistor 7 are short-circuited, and the power is turned on. Current is supplied to the coil of the relay 3 for power supply, and a steady energization state is set.
【００１２】ソフトスタート用リレー６に励磁動作不良
が発生した場合の動作を図３に示す。図３において、既
述した電源投入用スイッチ２の接点をＣ側に倒すと、コ
イル電流供給用コンデンサ４に蓄えられていた電荷によ
り電源投入用リレー３がオンし、ソフトスタート抵抗７
を通して負荷に電流が流れる。ソフトスタート用リレー
６に励磁動作不良が発生している場合、Ａ点の電位がソ
フトスタート用リレー６の動作電圧（約Ｖｓ×０．８）
以上になった時もソフトスタート用リレー６がオンしな
いため、電源投入用リレー３のコイルには、コイル電流
供給用コンデンサ４に蓄えられている電荷によっての
み、電流が供給される。コイル電流供給用コンデンサ４
の端子電圧、すなわちＣ点の電位は時間の経過と共に減
少し、電源投入用リレー３の開放電圧（約０．１×Ｖ
ｓ）以下になった時、電源投入用リレー３がオフとな
り、負荷に電流の供給が停止する。FIG. 3 shows the operation in the case where the magnetizing operation failure occurs in the soft start relay 6. In FIG. 3, when the contact of the power-on switch 2 described above is tilted to the C side, the power-on relay 3 is turned on by the charge accumulated in the coil current supply capacitor 4, and the soft start resistor 7
Current flows through the load. If the soft start relay 6 has a defective excitation operation, the potential at the point A is the operating voltage of the soft start relay 6 (about Vs × 0.8).
Even when the above is reached, the soft start relay 6 does not turn on, so that the coil of the power-on relay 3 is supplied with current only by the electric charge stored in the coil current supply capacitor 4. Coil current supply capacitor 4
Terminal voltage, that is, the potential at the point C decreases with the passage of time, and the open voltage of the power-on relay 3 (about 0.1 × V
s) or less, the power-on relay 3 is turned off and current supply to the load is stopped.
【００１３】したがって、ソフトスタート用リレー６に
励磁動作不良が発生している場合でも、ソフトスタート
抵抗７に連続通電されることがなく、ソフトスタート抵
抗７は焼損の恐れがない。Therefore, even if the soft start relay 6 is defective in the excitation operation, the soft start resistor 7 is not continuously energized, and the soft start resistor 7 is not likely to be burned.
【００１４】[0014]
【発明の効果】以上説明した通り、本発明によれば、ソ
フトスタート用リレーに励磁動作不良が発生した場合、
ソフトスタート抵抗を焼損させることのない突入電流防
止回路を実現することが可能となる。As described above, according to the present invention, when an exciting operation failure occurs in the soft start relay,
It is possible to realize an inrush current prevention circuit that does not burn out the soft start resistance.
【図１】本発明の実施例の電気回路図である。FIG. 1 is an electric circuit diagram of an embodiment of the present invention.
【図２】本発明の実施例の動作説明図である。FIG. 2 is an operation explanatory diagram of the embodiment of the present invention.
【図３】同じく本発明の実施例の動作説明図である。FIG. 3 is an operation explanatory diagram of the embodiment of the invention.
【図４】従来例の電気回路図である。FIG. 4 is an electric circuit diagram of a conventional example.
【図５】従来例の動作説明図である。FIG. 5 is an operation explanatory diagram of a conventional example.
２…電源投入用のスイッチ、３…電源投入用のリレー、
４…コイル電流供給用コンデンサ、６…ソフトスタート
用リレー、７…ソフトスタート抵抗。2 ... switch for power-on, 3 ... relay for power-on,
4 ... Capacitor for supplying coil current, 6 ... Relay for soft start, 7 ... Resistor for soft start.
Claims (1)
を抑制するために、電源投入用リレーとソフトスタート
抵抗と、ソフトスタート終了時励磁されることによりソ
フトスタート抵抗の端子間を短絡するリレー（以下、ソ
フトスタート用リレーと称する）とを備えた突入電流防
止回路において、 ソフトスタート用リレーに励磁動作不良が発生した際、
ソフトスタート抵抗の焼損を防止するために、ソフトス
タート動作時の電源投入用リレーのコイル励磁をコンデ
ンサの蓄積電荷によって行い、ソフトスタート用リレー
に励磁動作不良が発生した際自動的に電源を切断する安
全回路を備えたことを特徴とする突入電流防止回路。1. A relay for turning on a power supply, a soft start resistor, and a relay for short-circuiting the terminals of the soft start resistor when excited at the end of the soft start in order to suppress an inrush current generated when the power of an electronic device is turned on. (Hereinafter, referred to as a soft start relay) In the inrush current prevention circuit, when the soft start relay has a defective excitation operation,
In order to prevent burnout of the soft start resistor, the coil of the power-on relay during soft start operation is excited by the accumulated charge in the capacitor, and the power is automatically turned off when the excitation error occurs in the soft start relay. Inrush current prevention circuit characterized by having a safety circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5068254A JPH06284571A (en) | 1993-03-26 | 1993-03-26 | Rush current prevention circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5068254A JPH06284571A (en) | 1993-03-26 | 1993-03-26 | Rush current prevention circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH06284571A true JPH06284571A (en) | 1994-10-07 |
Family
ID=13368441
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5068254A Withdrawn JPH06284571A (en) | 1993-03-26 | 1993-03-26 | Rush current prevention circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH06284571A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100509477B1 (en) * | 2002-09-19 | 2005-08-22 | 삼성전자주식회사 | Arrangement and method for protecting circuit of switching mode power supply |
| CN102768919A (en) * | 2012-06-15 | 2012-11-07 | 张家港市泓溢电源科技有限公司 | Soft-start circuit |
| JP2014068105A (en) * | 2012-09-25 | 2014-04-17 | Nec Embedded Products Ltd | Power supply switching circuit |
| CN104716818A (en) * | 2013-12-12 | 2015-06-17 | 北汽福田汽车股份有限公司 | Vehicle-mounted DC/DC converter input output protection circuit, protection method and electric vehicle |
| US9859809B2 (en) | 2015-10-23 | 2018-01-02 | Mitsubishi Electric Corporation | Power conversion device |
-
1993
- 1993-03-26 JP JP5068254A patent/JPH06284571A/en not_active Withdrawn
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100509477B1 (en) * | 2002-09-19 | 2005-08-22 | 삼성전자주식회사 | Arrangement and method for protecting circuit of switching mode power supply |
| CN102768919A (en) * | 2012-06-15 | 2012-11-07 | 张家港市泓溢电源科技有限公司 | Soft-start circuit |
| JP2014068105A (en) * | 2012-09-25 | 2014-04-17 | Nec Embedded Products Ltd | Power supply switching circuit |
| CN104716818A (en) * | 2013-12-12 | 2015-06-17 | 北汽福田汽车股份有限公司 | Vehicle-mounted DC/DC converter input output protection circuit, protection method and electric vehicle |
| US9859809B2 (en) | 2015-10-23 | 2018-01-02 | Mitsubishi Electric Corporation | Power conversion device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 20000530 |