JPH0124029B2 - - Google Patents
Info
- Publication number
- JPH0124029B2 JPH0124029B2 JP57182729A JP18272982A JPH0124029B2 JP H0124029 B2 JPH0124029 B2 JP H0124029B2 JP 57182729 A JP57182729 A JP 57182729A JP 18272982 A JP18272982 A JP 18272982A JP H0124029 B2 JPH0124029 B2 JP H0124029B2
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- transformer
- load
- output
- smoothing
- 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
- 238000009499 grossing Methods 0.000 claims description 20
- 238000004804 winding Methods 0.000 claims description 9
- 238000010586 diagram Methods 0.000 description 5
- 239000003990 capacitor Substances 0.000 description 4
- 238000003079 width control Methods 0.000 description 4
- 230000007423 decrease Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
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
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Voltage And Current In General (AREA)
- Dc-Dc Converters (AREA)
Description
【発明の詳細な説明】
本発明は、直流入力をスイツチング制御して出
力負荷に安定な直流電流を供給するスイツチング
形直流電源装置に関するものであり、さらに詳し
くは無負荷、軽負荷時に出力電圧の上昇を防止す
るようにした直流電源装置に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a switching type DC power supply device that switches and controls DC input to supply stable DC current to an output load. The present invention relates to a DC power supply device designed to prevent rise in power.
第１図は従来のこの種のパルス幅制御方式によ
る安定化直流電源装置の回路構成図であつて、１
は直流電流が入力される入力端子、２はスイツチ
ングトランジスタ、３は電圧変換用の出力トラン
ス、４，５は整流ダイオード、６は平滑コイル、
７は平滑コンデンサ、８は出力トランス３の励磁
エネルギーを放出するためのダイオード、９はパ
ルス幅制御回路で、出力トランス３の直流出力を
得、トランジスタ２をスイツチング制御するため
のものである。１０は無負荷時にも出力電圧を定
電圧に維持するための擬似負荷用の抵抗、１１は
出力端子である。 FIG. 1 is a circuit configuration diagram of a stabilized DC power supply device using a conventional pulse width control method of this type.
is an input terminal into which direct current is input, 2 is a switching transistor, 3 is an output transformer for voltage conversion, 4 and 5 are rectifier diodes, 6 is a smoothing coil,
7 is a smoothing capacitor, 8 is a diode for discharging the excitation energy of the output transformer 3, and 9 is a pulse width control circuit for obtaining the DC output of the output transformer 3 and controlling the switching of the transistor 2. 10 is a resistor for a pseudo load to maintain the output voltage at a constant voltage even when there is no load, and 11 is an output terminal.
第１図の回路によれば、パルス幅制御回路９の
出力電圧によりトランジスタ２がオンし、それに
より入力端子１に印加された直流電流は出力トラ
ンス３を介してパルス的に電圧変換および整流、
平滑され、直流電圧を出力するというものであ
る。そして、制御回路９はパルス幅制御により出
力を定電圧にするようにトランジスタ２をオン、
オフ制御する。 According to the circuit shown in FIG. 1, the transistor 2 is turned on by the output voltage of the pulse width control circuit 9, and the DC current applied to the input terminal 1 is converted into voltage and rectified in a pulsed manner through the output transformer 3.
It is smoothed and outputs a DC voltage. Then, the control circuit 9 turns on the transistor 2 so as to make the output a constant voltage by controlling the pulse width.
Control off.
第２図は第１図の回路の出力特性を示したもの
であるが、負荷電流I0に対して出力電圧V0は定電
圧特性を示している。この出力特性はトランジス
タ２のスイツチング時の蓄積時間等により負荷電
流I0が低減する場合には破線にて示すように出力
電圧V0が上昇することがある。このため、抵抗
１０の抵抗値を下げ、電流IDを増加させることに
より無負荷あるいは軽負荷時においても出力が定
電圧特性を維持するようにしている。 FIG. 2 shows the output characteristics of the circuit shown in FIG. 1, and the output voltage V 0 exhibits constant voltage characteristics with respect to the load current I 0 . In this output characteristic, when the load current I 0 decreases due to the accumulation time during switching of the transistor 2, etc., the output voltage V 0 may rise as shown by the broken line. Therefore, by lowering the resistance value of the resistor 10 and increasing the current ID , the output maintains constant voltage characteristics even when there is no load or a light load.
しかしながら、この電流IDは負荷電流の増減に
かかわらず、常に一定量を流すことになり、場合
によつては定格負荷電流の10〜20％にも増加させ
ることが必要になることもある。そのため、抵抗
１０の電力損失が増大し、直流電源装置の電力効
率を著しく低下せしめ、放熱のための実装スペー
スを増加させる欠点があつた。 However, this current ID always flows at a constant amount regardless of increases or decreases in the load current, and in some cases it may be necessary to increase it to 10 to 20% of the rated load current. Therefore, the power loss of the resistor 10 increases, the power efficiency of the DC power supply device is significantly reduced, and the mounting space for heat dissipation is increased.
本発明は、上記した従来技術の欠点をなくし、
電力損失が少なく、安定な擬似負荷回路を持つ直
流電源装置を提供することにある。 The present invention eliminates the above-mentioned drawbacks of the prior art,
It is an object of the present invention to provide a DC power supply device having a stable pseudo load circuit with little power loss.
本発明は、上記目的を達成するために、無負荷
あるいは軽負荷時にのみ動作する擬似負荷回路を
形成し、負荷に流れる電流を、平滑コイルを兼ね
たトランスで検出し、シユミツト・トリガ回路を
介して擬似負荷回路に流れる負荷電流をオン、オ
フ制御するように構成したものである。 In order to achieve the above object, the present invention forms a pseudo load circuit that operates only when there is no load or light load, detects the current flowing to the load with a transformer that also serves as a smoothing coil, and detects the current flowing through the load through a Schmitt trigger circuit. The load current flowing through the pseudo load circuit is controlled to turn on and off.
以下、第３図、第４図に従つて本発明の一実施
例を詳述する。第３図の回路において、第１図と
同一符号を付してあるものは同一機能を有するも
のであるが第３図においては、第１図の抵抗１０
の代りに擬似負荷回路１２を設けた点、および、
平滑コイルを兼ねたトランス６′を設けた点であ
る。この擬似負荷回路１２は、整流、平滑回路を
構成するダイオード１３、コンデンサ１４、抵抗
１５、またその出力電圧を受けてスイツチング
し、シユミツト・トリガ回路を構成するトランジ
スタ１６，１７並びに抵抗１８，１９，２０とを
有して成り、図示の如く接続構成してある。そし
て、平滑コイルを兼ねたトランス６′は一次巻線
を出力トランス３と直列挿入し、二次巻線を前記
整流、平滑並びにシユミツト・トリガ回路に接続
してある。 Hereinafter, one embodiment of the present invention will be described in detail with reference to FIGS. 3 and 4. In the circuit of Fig. 3, those with the same reference numerals as those in Fig. 1 have the same functions.
The point that a pseudo load circuit 12 is provided instead of, and
The point is that a transformer 6' which also serves as a smoothing coil is provided. This pseudo load circuit 12 includes a diode 13, a capacitor 14, and a resistor 15 that constitute a rectifier and smoothing circuit, as well as transistors 16, 17 and resistors 18, 19, which switch in response to the output voltage and constitute a Schmitt trigger circuit. 20, and are connected and configured as shown in the figure. A transformer 6' which also serves as a smoothing coil has its primary winding inserted in series with the output transformer 3, and its secondary winding connected to the rectifying, smoothing and Schmitt trigger circuit.
第３図の擬似負荷回路１２の動作は、まず、平
滑コイルを兼ねたトランス６′の一次巻線に流れ
る負荷電流を二次巻線およびダイオード１３、コ
ンデンサ１４、抵抗１５で構成された整流、平滑
回路で検出し、この電圧によりトランジスタ１
６，１７並びに抵抗１８〜２０で構成するシユミ
ツト・トリガ回路を介して擬似負荷電流IDを制御
する。この電流はシユミツト・トリガ回路の出力
トランジスタ１７のオン、オフ制御により擬似負
荷用の抵抗２１を介して流れる。 The operation of the pseudo load circuit 12 shown in FIG. 3 is as follows: First, the load current flowing through the primary winding of the transformer 6', which also serves as a smoothing coil, is rectified by a secondary winding, a diode 13, a capacitor 14, and a resistor 15. Detected by a smoothing circuit, this voltage causes transistor 1 to
The pseudo load current ID is controlled through a Schmitt trigger circuit comprised of resistors 6 and 17 and resistors 18-20. This current flows through the pseudo load resistor 21 by turning on and off the output transistor 17 of the Schmitt trigger circuit.
第４図は第３図において平滑コイルを兼ねたト
ランス６′の１次巻線に流れる電流、即ち、負荷
電流I0に対する検出電圧Vsおよび擬似負荷電流ID
の動作特性図である。負荷電流I0の増減により、
検出電圧Vsも変動するが、シユミツト・トリガ
回路の高、低の両閾値VthH，VthLにより、擬似
負荷電流はヒステリシス特性で変化する。この特
性により、負荷の不安定化や主スイツチ用トラン
ジスタ２、整流ダイオード４などによるスイツチ
ング雑音が擬似負荷回路１２に加わつても擬似負
荷電流が発振性の変動を生ずることはない。ま
た、平滑コイルを兼ねたトランス６′を利用して
負荷電流を検出することは、装置の出力部に検出
用抵抗を直列に追加挿入することによる電力損失
もなく、低消費電力化も可能になる。 Figure 4 shows the current flowing in the primary winding of the transformer 6' which also serves as the smoothing coil in Figure 3, that is, the detected voltage V s and the pseudo load current I D with respect to the load current I 0 .
FIG. By increasing or decreasing the load current I 0 ,
Although the detection voltage V s also changes, the pseudo load current changes with hysteresis characteristics due to both the high and low thresholds Vth H and Vth L of the Schmitt trigger circuit. Due to this characteristic, even if load instability or switching noise caused by the main switch transistor 2, rectifier diode 4, etc. is applied to the pseudo load circuit 12, the pseudo load current will not cause oscillation fluctuations. In addition, detecting the load current using the transformer 6', which also serves as a smoothing coil, eliminates the power loss caused by adding a detection resistor in series to the output section of the device, making it possible to reduce power consumption. Become.
以上の説明からも明らかなように本発明によれ
ば、無負荷あるいは軽負荷時にのみ電流を流す擬
似負荷回路を設け、その無負荷、軽負荷状態を平
滑コイルを兼ねたトランスで検出し、シユミツ
ト・トリガ回路を介して擬似負荷回路に流れる負
荷電流を制御するように構成したものであるか
ら、電力損失が少なく高効率で、安定な擬似負荷
回路を持つ直流電源装置を得ることができる。 As is clear from the above description, according to the present invention, a pseudo load circuit is provided that allows current to flow only during no load or light load, and the no load or light load state is detected by a transformer that also serves as a smoothing coil. - Since it is configured to control the load current flowing to the pseudo load circuit via the trigger circuit, it is possible to obtain a DC power supply device with low power loss, high efficiency, and a stable pseudo load circuit.
第１図は従来の安定化直流電源装置の回路構成
図、第２図は第１図の回路特性図、第３図は本発
明の一実施例を示す安定化直流電源装置の回路構
成図、第４図は第３図の回路特性図である。
６′……平滑コイルを兼ねたトランス、７，１
４……コンデンサ、９……パルス幅制御回路、１
２……擬似負荷回路、１３……ダイオード、１
５，１８〜２１……抵抗、１６，１７……トラン
ジスタ。
FIG. 1 is a circuit configuration diagram of a conventional stabilized DC power supply device, FIG. 2 is a circuit characteristic diagram of FIG. 1, and FIG. 3 is a circuit configuration diagram of a stabilized DC power supply device showing an embodiment of the present invention. FIG. 4 is a circuit characteristic diagram of FIG. 3. 6'...Transformer that also serves as a smoothing coil, 7,1
4... Capacitor, 9... Pulse width control circuit, 1
2...Pseudo load circuit, 13...Diode, 1
5, 18-21...Resistor, 16,17...Transistor.
Claims (1)
ンスの二次巻線に接続された整流、平滑回路と、
該整流、平滑回路の出力段に接続された擬似負荷
とを備えた安定化直流電源装置において、 前記トランスの二次巻線に直列に第２のトラン
スの一次巻線を接続して前記整流、平滑回路の平
滑コイルとして使用するとともに、 該第２のトランスの二次巻線に発生する電圧を
整流、平滑する第２の整流、平滑回路と、該第２
の整流、平滑回路の出力を入力するシユミツト・
トリガ回路とを設け、 該シユミツト・トリガ回路の出力により上記擬
似負荷を駆動するよう構成したことを特徴とする
安定化直流電源装置。[Claims] 1. A transformer that converts DC input into voltage, a rectifier and smoothing circuit connected to the secondary winding of the transformer,
In a stabilized DC power supply device comprising a pseudo load connected to the output stage of the rectifying and smoothing circuit, the primary winding of a second transformer is connected in series with the secondary winding of the transformer to perform the rectifying and smoothing circuit. a second rectifying and smoothing circuit that is used as a smoothing coil of the smoothing circuit and rectifies and smoothes the voltage generated in the secondary winding of the second transformer;
Schmidt inputs the output of the rectifier and smoothing circuit.
1. A stabilized DC power supply device comprising: a trigger circuit; and configured to drive the pseudo load using the output of the Schmitt trigger circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18272982A JPS5972980A (en) | 1982-10-20 | 1982-10-20 | Stabilized dc power source |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18272982A JPS5972980A (en) | 1982-10-20 | 1982-10-20 | Stabilized dc power source |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5972980A JPS5972980A (en) | 1984-04-25 |
| JPH0124029B2 true JPH0124029B2 (en) | 1989-05-09 |
Family
ID=16123418
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18272982A Granted JPS5972980A (en) | 1982-10-20 | 1982-10-20 | Stabilized dc power source |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5972980A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH066710Y2 (en) * | 1988-12-16 | 1994-02-16 | 横河電機株式会社 | Variable dummy circuit for switching power supply |
| JPH033185U (en) * | 1989-05-31 | 1991-01-14 | ||
| US4931920A (en) * | 1989-06-16 | 1990-06-05 | Ncr Corporation | Circuit and method for regulating output voltage of a switch mode power supply having a current mode magnetic amplifier |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57134729A (en) * | 1981-02-13 | 1982-08-20 | Nec Corp | Direct current power supply |
-
1982
- 1982-10-20 JP JP18272982A patent/JPS5972980A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57134729A (en) * | 1981-02-13 | 1982-08-20 | Nec Corp | Direct current power supply |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5972980A (en) | 1984-04-25 |
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