JPS5929888B2 - power circuit - Google Patents
power circuitInfo
- Publication number
- JPS5929888B2 JPS5929888B2 JP51079954A JP7995476A JPS5929888B2 JP S5929888 B2 JPS5929888 B2 JP S5929888B2 JP 51079954 A JP51079954 A JP 51079954A JP 7995476 A JP7995476 A JP 7995476A JP S5929888 B2 JPS5929888 B2 JP S5929888B2
- Authority
- JP
- Japan
- Prior art keywords
- power supply
- current
- energy storage
- circuit
- storage means
- 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
- Rectifiers (AREA)
- Control Of Electrical Variables (AREA)
- Continuous-Control Power Sources That Use Transistors (AREA)
- Dc-Dc Converters (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Description
【発明の詳細な説明】
本発明は、商用電源を入力とする電源回路における力率
改善制御回路に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a power factor correction control circuit in a power supply circuit that receives commercial power as input.
一般に交流の商用電源を用い、これをコンデンサやチョ
ークコイルで平滑し、ほぼ直流出力化する電源回路は、
ＬやＣによる電流の波形歪や位相ずれによつて入力電力
の力率が悪化する。とくに大容量の場合は電力供給ライ
ンに悪影響を及ぼす。このような問題を解決する方法と
して、トランジスタ等のチョッパを用い、電源電圧が低
下した場合も電源側から電源回路のコンデンサに電流を
印加し、力率を改善する方式がある。本発明は、このよ
うな力率制御形の電源回路の保護することを目的とする
ものである。Generally, a power supply circuit uses an AC commercial power source and smooths it with a capacitor or choke coil to make it almost a DC output.
The power factor of input power deteriorates due to current waveform distortion and phase shift caused by L and C. Especially when the capacity is large, it has a negative effect on the power supply line. One way to solve this problem is to use a chopper such as a transistor to apply current from the power supply to the capacitor of the power supply circuit even when the power supply voltage drops, thereby improving the power factor. The present invention aims to protect such a power factor controlled power supply circuit.
以下、図面により本発明を詳細に説明する。Hereinafter, the present invention will be explained in detail with reference to the drawings.
第１図は本発明の構成を示す実施例である。図において
１は商用電源であり、その交流電力はダイオード２−ａ
、２−ｂ、２−ｃおよび２−ｄを介してコンデンサ３に
供給され、平滑される。またこのような平滑電力が直流
モータなどの負荷８を駆動する。一方これとは並列にダ
イオード２−ｅ、２−ｆ、チョークコイル４、およびダ
イオード５を経る供給回路がコンデンサー３に接続され
る。FIG. 1 shows an embodiment showing the configuration of the present invention. In the figure, 1 is a commercial power supply, and the AC power is supplied to the diode 2-a.
, 2-b, 2-c and 2-d to the capacitor 3 and smoothed. Further, such smoothed power drives a load 8 such as a DC motor. On the other hand, a supply circuit that passes through diodes 2-e, 2-f, a choke coil 4, and a diode 5 is connected to the capacitor 3 in parallel.
この回路は端子Ｔより入力される高周波信号によつて動
作するトランジスタチョッパ６によつて、１の電圧が低
下したときも、コンデンサ３に電流を継続して流入させ
、電源の力率を改善する役目をする。ところで、負荷電
流が減少した場合を考えると上記の供給回路からの電流
の継続によりコンデンサ３の電位が上昇し、その定格電
圧を超過する場合がある。このため、定電圧素子その他
の放電回路１０により、コンデンサ３の電位が所定以上
に達したときに、その電荷を放電する方法が考えられる
。しかしこのような方法はいたずらに電力を消費するた
けであり、ひんばんな使用は避けるべきである。したが
つて本発明では、このような電圧超過状態を検出し、前
記のチヨツパの動作を一時停止させる。This circuit uses a transistor chopper 6 operated by a high-frequency signal input from a terminal T to continue flowing current into the capacitor 3 even when the voltage at 1 drops, thereby improving the power factor of the power source. play a role. By the way, considering the case where the load current decreases, the potential of the capacitor 3 increases due to the continuation of the current from the above-mentioned supply circuit, and may exceed its rated voltage. For this reason, a method can be considered in which the electric charge is discharged by a constant voltage element or other discharge circuit 10 when the potential of the capacitor 3 reaches a predetermined value or higher. However, such a method wastes power unnecessarily and should be avoided infrequent use. Therefore, in the present invention, such an overvoltage condition is detected and the operation of the chopper is temporarily stopped.
すなわちコンデンサー３の電圧は検出抵抗９−ａおよび
９−ｂで検出され、これが一定に達したことがコンパレ
ータ１１で検出され、これによつてヒステリシス特性を
持つスイツチ信号発生回路１２が動作し、スイツチ１３
により、端子７からの信号をオフとする。超過状態の検
出方法としては、放電回路１０を流れる電流、あるいは
負荷電流検出器１５を流れる電流によつて検出する方法
がある。負荷電流の減少により超過状態が起ることを検
出するのである（超過状態は負荷電流の減少により生じ
る）。以上に述べたように、本発明によれば、比較的簡
単な回路構成で、安定な力率改良形電源回路の提供が可
能であり、工業的な効果が大きい。That is, the voltage of the capacitor 3 is detected by the detection resistors 9-a and 9-b, and when it reaches a certain level, the comparator 11 detects that the voltage of the capacitor 3 has reached a certain level, and thereby the switch signal generation circuit 12 having hysteresis characteristics is operated, and the switch is activated. 13
This turns off the signal from terminal 7. As a method of detecting the excess state, there is a method of detecting the current flowing through the discharge circuit 10 or the current flowing through the load current detector 15. It detects that an excess condition occurs due to a decrease in load current (an excess condition is caused by a decrease in load current). As described above, according to the present invention, it is possible to provide a stable power factor improving power supply circuit with a relatively simple circuit configuration, and the present invention has great industrial effects.
なお本発明はチヨツピングすなわち電流断続を行なう素
子の種類等に無関係に利用することが可能であるＯNote that the present invention can be used regardless of the type of element that performs chopping, that is, current interruption.
図は本発明による電源回路の実施例を示す。 The figure shows an embodiment of a power supply circuit according to the invention.
Claims (1)
手段を介して直流電流に変換する電源回路において、該
交流電源電流を整流する第２の整流回路と、該第２の整
流回路により整流された電流が供給されるインダクタン
スと、該インダクタンスに蓄積された磁気エネルギーを
該エネルギー蓄積手段に供給するように該交流電源の周
期よりも短い間隔で該インダクタンスと該エネルギー蓄
積手段との接続をオンオフするスイッチ手段と、該エネ
ルギー蓄積手段がエネルギー蓄積超過状態になつたとき
に該スイッチ手段をオフさせる手段とを有することを特
徴とする電源回路。1. In a power supply circuit that converts an AC power supply current into a DC current through a first rectification circuit and an energy storage means, a second rectification circuit that rectifies the AC power supply current, and a power supply circuit that is rectified by the second rectification circuit. an inductance to which current is supplied; and a switch that turns on and off the connection between the inductance and the energy storage means at intervals shorter than the cycle of the AC power supply so as to supply the magnetic energy stored in the inductance to the energy storage means. and means for turning off the switch means when the energy storage means enters an excess energy storage state.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP51079954A JPS5929888B2 (en) | 1976-07-07 | 1976-07-07 | power circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP51079954A JPS5929888B2 (en) | 1976-07-07 | 1976-07-07 | power circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS535755A JPS535755A (en) | 1978-01-19 |
| JPS5929888B2 true JPS5929888B2 (en) | 1984-07-24 |
Family
ID=13704693
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP51079954A Expired JPS5929888B2 (en) | 1976-07-07 | 1976-07-07 | power circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5929888B2 (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4257430A (en) * | 1979-02-21 | 1981-03-24 | Liggett Group Inc. | Tobacco composition including palladium |
| JPS59130118U (en) * | 1983-02-21 | 1984-09-01 | 株式会社日立国際電気 | Boost regulated power supply |
| JPH02241371A (en) * | 1989-03-14 | 1990-09-26 | Mitsubishi Electric Corp | Voltage type inverter |
| JPH0568376A (en) * | 1991-09-10 | 1993-03-19 | Fujitsu General Ltd | Air conditioner control method |
| JPH0568375A (en) * | 1991-09-10 | 1993-03-19 | Fujitsu General Ltd | Control method for air-conditioner |
| DE69533206D1 (en) * | 1994-04-08 | 2004-07-29 | Vlt Corp | Power conversion with high efficiency |
| WO2010038841A1 (en) * | 2008-10-03 | 2010-04-08 | 東芝キヤリア株式会社 | Three-phase rectifier |
-
1976
- 1976-07-07 JP JP51079954A patent/JPS5929888B2/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS535755A (en) | 1978-01-19 |
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