JPH0386072A - Dc power-supply device - Google Patents

Dc power-supply device

Info

Publication number
JPH0386072A
JPH0386072A JP22073589A JP22073589A JPH0386072A JP H0386072 A JPH0386072 A JP H0386072A JP 22073589 A JP22073589 A JP 22073589A JP 22073589 A JP22073589 A JP 22073589A JP H0386072 A JPH0386072 A JP H0386072A
Authority
JP
Japan
Prior art keywords
voltage
switching element
circuit
load
output
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.)
Granted
Application number
JP22073589A
Other languages
Japanese (ja)
Other versions
JP2841530B2 (en
Inventor
Takashi Uno
貴士 宇野
Noboru Hanaguchi
花口 登
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP22073589A priority Critical patent/JP2841530B2/en
Publication of JPH0386072A publication Critical patent/JPH0386072A/en
Application granted granted Critical
Publication of JP2841530B2 publication Critical patent/JP2841530B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Abstract

PURPOSE:To obtain a miniature DC power-supply device having high efficiency by connecting the output circuit of a rectifying and smoothing circuit, an auxiliary voltage detecting circuit, and an auxiliary output circuit, by one or more each, to the secondary winding of a switching transformer, and by controlling a switching element on the primary side, with the voltage detecting circuit of the output circuit. CONSTITUTION:Driving circuit 33, 34 and loads 35, 36 are arranged, and the voltage of the load 36 is set lower than the voltage of the load 35, and the frequency of a switching element 30 is set lower than the frequency of a switching element 22. When the switching elements 30, 22 are ON, then power is stored in a transformer 23, and the switching element 22 is OFF, and the power is smoothed by a capacitor 27, and the output voltage of the load 36 is detected, and is compared with reference voltage 28 to be amplified, and is fed back to the driving circuit 34, and the output voltage is kept constant. Also when the switching element 30 is OFF and the switching element 22 is ON, then the voltage of the load 35 is kept constant in the same manner. As a result, the miniature DC power-supply device of high efficiency can be obtained.

Description

【発明の詳細な説明】 産業上の利用分野 本発明は各種電子機器の電源として利用される直流電源
装置に関するものである。
DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a DC power supply device used as a power source for various electronic devices.

従来の技術 従来の技術としては、例えば第3図の回路図に示したよ
うにスイッチング素子2をオンオフさせてスイッチング
トランス4の各巻線より各出力に電力を供給し、制御さ
れていない出力電圧は負荷電流によって大きく変動し、
この出力電圧の変動をおさえるためにドロッパ回路を必
要としていた。
2. Prior Art As a conventional technology, for example, as shown in the circuit diagram of FIG. 3, power is supplied to each output from each winding of a switching transformer 4 by turning on and off the switching element 2, and the uncontrolled output voltage is It varies greatly depending on the load current,
A dropper circuit was required to suppress this variation in output voltage.

以下に第3図の回路の動作を説明する。駆動回路1の出
力によってスイッチング素子2がオンのとき、直流電源
3よりスイッチングトランス4にエネルギーが蓄えられ
、スイッチング素子2がオフのときスイッチングトラン
ス4に蓄えられたエネルギーは、スイッチングトランス
4の各出力の2次巻線よりそれぞれ放出され、ダイオー
ド5゜10、コンデンサ6.11で平滑され直流電圧と
なる。
The operation of the circuit shown in FIG. 3 will be explained below. When the switching element 2 is turned on by the output of the drive circuit 1, energy is stored in the switching transformer 4 from the DC power supply 3, and when the switching element 2 is turned off, the energy stored in the switching transformer 4 is transferred to each output of the switching transformer 4. The voltage is emitted from the secondary winding of each of the two, and is smoothed by a diode 5.10 and a capacitor 6.11 to become a DC voltage.

更に負荷7の出力電圧を検出して誤差増幅器9によって
基準電圧8と比較し増幅して駆動回路1に帰還する。こ
の帰還信号によってスイッチング素子2のオン期間を制
御し常に負荷7にかかる電圧を一定に保つ。
Furthermore, the output voltage of the load 7 is detected, compared with the reference voltage 8 by the error amplifier 9, amplified, and fed back to the drive circuit 1. This feedback signal controls the on period of the switching element 2 to keep the voltage applied to the load 7 constant.

そして負荷12のトランス巻線電圧は、負荷7のトラン
ス巻線との巻数比で定まるが、実際にはトランス4にも
れ磁束が生じるため負荷電流による変動が負荷13のト
ランス巻線電圧の変動となってあられれる。
The transformer winding voltage of the load 12 is determined by the turns ratio with respect to the transformer winding of the load 7, but in reality, leakage flux occurs in the transformer 4, so fluctuations due to the load current cause changes in the transformer winding voltage of the load 13. It will come to you.

そこで負荷12のトランス巻線電圧を設定電圧より高め
にし、トランジスタ13で降圧して負荷12に直流電圧
を供給する。更に負荷12の出力電圧を検出して差動増
幅器14によって基準電圧15と比較しトランジスタ1
3のベース電流を制御し常に負荷12にかかる電圧を一
定に保つことで各出力電圧の変動を改善している。なお
、図中16は負荷12に並列に接続されたコンデンサで
ある。
Therefore, the transformer winding voltage of the load 12 is made higher than the set voltage, and the voltage is stepped down by the transistor 13 to supply the load 12 with a DC voltage. Furthermore, the output voltage of the load 12 is detected and compared with the reference voltage 15 by the differential amplifier 14.
By controlling the base current of 3 and always keeping the voltage applied to the load 12 constant, fluctuations in each output voltage are improved. Note that 16 in the figure is a capacitor connected in parallel to the load 12.

発明が解決しようとする課題 以上のような従来の回路では、負荷12のトランス巻線
電圧を負荷12にかかる電圧より高めに設定し、トラン
ジスタ13で降圧させるため、負荷電流が大きい場合ト
ランジスタ13の回路損失が大きくなり大型化し高価に
なる欠点があった。
Problems to be Solved by the Invention In the conventional circuit as described above, the transformer winding voltage of the load 12 is set higher than the voltage applied to the load 12, and the voltage is stepped down by the transistor 13. Therefore, when the load current is large, the voltage of the transistor 13 is lowered. It has the drawbacks of increased circuit loss, increased size, and increased cost.

本発明はかかる点に鑑みてなされたもので、高効率、小
型で安価な直流電源装置を提供することを目的としてい
る。
The present invention has been made in view of these points, and an object of the present invention is to provide a highly efficient, compact, and inexpensive DC power supply device.

課題を解決するための手段 上記課題を解決するために本発明は、直流電源にスイッ
チング素子を介して接続した一次巻線を有するスイッチ
ングトランスの二次巻線に、整流平滑回路からなる基本
の出力回路と、整流平滑回路と出力電圧を検出する補助
電圧検出回路とこの補助電圧検出回路によって制御され
るスイッチング素子からなる補助出力回路を1個以上接
続し、上記基本の出力回路に電圧検出回路を接続し、こ
の電圧検出回路によって上記一次側のスイッチング素子
を制御するように構成したものである。
Means for Solving the Problems In order to solve the above problems, the present invention provides a basic output consisting of a rectifying and smoothing circuit in the secondary winding of a switching transformer having a primary winding connected to a DC power source via a switching element. The circuit is connected to one or more auxiliary output circuits consisting of a rectifier and smoothing circuit, an auxiliary voltage detection circuit that detects the output voltage, and a switching element controlled by this auxiliary voltage detection circuit, and a voltage detection circuit is connected to the above basic output circuit. The primary side switching element is controlled by this voltage detection circuit.

作用 前記回路構成とすることにより補助電圧検出回路によっ
て制御されるスイッチング素子のオンオフによって1次
側よりスイッチングトランスに蓄えられたエネルギーを
各出力に振り分けることができ、1つのスイッチングト
ランスを各出力に時間分割で使用することにより、各出
力の電圧をそれぞれ制御することができる。
Effect By using the above circuit configuration, the energy stored in the switching transformer can be distributed from the primary side to each output by turning on and off the switching element controlled by the auxiliary voltage detection circuit, and one switching transformer can be used for each output for a certain amount of time. By using it in division, the voltage of each output can be controlled individually.

実施例 第1図は、本発明の直流電源装置の一実施例である。本
発明の回路は直流電源21にスイッチング素子22を介
して接続した一次巻線N1を有するスイッチングトラン
ス23の二次巻INxに、ダイオード24.コンデンサ
25より構成される整流平滑回路からなる基本の出力回
路と、ダイオード26とコンデンサ27からなる整流平
滑回路と出力電圧を検出する基準電圧28と誤差増幅器
29からなる補助電圧検出回路とこの補助電圧検出回路
によって制御されるスイッチング素子30からなる補助
出力回路を1個以上接続し、上記基本の出力回路に基準
電圧31と誤差増幅器32よりなる電圧検出回路を接続
し、この電圧検出回路によって上記一次側のスイッチン
グ素子22を制御するように構成したものである。
Embodiment FIG. 1 shows an embodiment of the DC power supply device of the present invention. In the circuit of the present invention, a diode 24 . A basic output circuit consisting of a rectifying and smoothing circuit consisting of a capacitor 25, a rectifying and smoothing circuit consisting of a diode 26 and a capacitor 27, an auxiliary voltage detection circuit consisting of a reference voltage 28 and an error amplifier 29 for detecting the output voltage, and this auxiliary voltage. One or more auxiliary output circuits each consisting of a switching element 30 controlled by a detection circuit are connected, and a voltage detection circuit consisting of a reference voltage 31 and an error amplifier 32 is connected to the basic output circuit. It is configured to control the switching element 22 on the side.

第1図において、33.34は駆動回路、35゜36は
負荷である。そして負荷36にかかる電圧は、負荷35
にかかる電圧より低く設定し、スイッチング素子30の
スイッチング周波数は、スイッチング素子22のスイッ
チング周波数より低く設定する。
In FIG. 1, 33 and 34 are drive circuits, and 35° and 36 are loads. The voltage applied to the load 36 is then the voltage applied to the load 36.
The switching frequency of the switching element 30 is set lower than the switching frequency of the switching element 22.

スイッチング素子30がオンの時スイッチング素子22
がオンの場合、スイッチングトランス23に電力が蓄え
られ、スイッチング素子22がオフになると、負荷36
にかがる電圧を負荷35にががる電圧より低く設定しで
あるためダイオード24は非導通状態となりスイッチン
グトランス23に蓄えられた電力はすべてコンデンサ2
7で平滑され負荷36に供給され、スイッチング素子2
2は、オンオフを繰り返す。更に負荷36にかがる出力
電圧を検出して基準電圧28と比較し増幅して駆動回路
34に帰還する。この帰還信号によってスイッチング素
子30のオン期間を制御し常に負荷36にかかる出力電
圧を一定に保つように働く。
When the switching element 30 is on, the switching element 22
is on, power is stored in the switching transformer 23, and when the switching element 22 is off, the load 36
Since the voltage applied to the load 35 is set lower than the voltage applied to the load 35, the diode 24 becomes non-conductive and all the power stored in the switching transformer 23 is transferred to the capacitor 2.
7 is smoothed and supplied to the load 36, and the switching element 2
2 repeats on/off. Further, the output voltage applied to the load 36 is detected, compared with the reference voltage 28, amplified, and fed back to the drive circuit 34. This feedback signal controls the on-period of the switching element 30 and works to always keep the output voltage applied to the load 36 constant.

そしてスイッチング素子30がオフになりスイッチング
素子22がオンの場合、スイッチングトランス23に電
力が蓄えられ、スイッチング素子22がオフになると、
スイッチングトランス23に蓄えられた電力はすべてコ
ンデンサ25で平滑され負荷35に供給され、スイッチ
ング素子22はオンオフを繰り返す。更に負荷35にか
かる出力電圧を検出して基準電圧31と比較し増幅して
駆動回路33に帰還する。この帰還信号によってスイッ
チング素子22のオン期間を制御し常に負荷35にかか
る出力電圧を一定に保つように働く。
When the switching element 30 is turned off and the switching element 22 is turned on, power is stored in the switching transformer 23, and when the switching element 22 is turned off,
All the electric power stored in the switching transformer 23 is smoothed by the capacitor 25 and supplied to the load 35, and the switching element 22 is repeatedly turned on and off. Furthermore, the output voltage applied to the load 35 is detected, compared with the reference voltage 31, amplified, and fed back to the drive circuit 33. This feedback signal controls the on-period of the switching element 22 and works to always keep the output voltage applied to the load 35 constant.

以下スイッチング素子30がオフの状態からオンの状態
へと変化していくが前記と同様の動作を行う。
Thereafter, the switching element 30 changes from the off state to the on state, but performs the same operation as described above.

第2図にスイッチングトランス23の二次巻線S2の電
圧Vsの波形と負荷35.36の出力電圧のリップル電
圧波形を示す。
FIG. 2 shows the waveform of the voltage Vs of the secondary winding S2 of the switching transformer 23 and the ripple voltage waveform of the output voltage of the load 35.36.

発明の効果 以上述べてきたように、本発明によれば、損失が大きく
なる電圧を降圧させる素子を必要とせず各出力電圧を制
御することができ、出力数に関係なくスイッチングトラ
ンスの二次巻線が1つとなるので、スイッチングトラン
スの構造が簡単になるので、全体の発熱が低下し、直流
電源装置の信頼性が向上し、極めて有用なものである。
Effects of the Invention As described above, according to the present invention, each output voltage can be controlled without the need for an element that steps down the voltage, which increases loss, and the secondary winding of the switching transformer can be controlled regardless of the number of outputs. Since there is only one wire, the structure of the switching transformer is simplified, the overall heat generation is reduced, and the reliability of the DC power supply is improved, making it extremely useful.

【図面の簡単な説明】[Brief explanation of drawings]

第1図は本発明の一実施例における直流電源装置の回路
図、第2図は、同要部の電圧波形図、第3図は従来の直
流電源装置の回路図である。 21・・・・・・直流電源、22・・・・・・スイッチ
ング素子、23・・・・・・スイッチングトランス、2
4・・・・・・ダイオード、25・・・・・・コンデン
サ、26・・・・・・ダイオード、27・・・・・・コ
ンデンサ、28・・・・・・基準電圧、29・・・・・
・誤差増幅器、30・・・・・・スイッチング素子、3
1・・・・・・基準電圧、32・・・・・・誤差増幅器
、33゜34・・・・・・駆動回路、35.36・・・
・・・負荷。
FIG. 1 is a circuit diagram of a DC power supply according to an embodiment of the present invention, FIG. 2 is a voltage waveform diagram of the same essential parts, and FIG. 3 is a circuit diagram of a conventional DC power supply. 21...DC power supply, 22...Switching element, 23...Switching transformer, 2
4...Diode, 25...Capacitor, 26...Diode, 27...Capacitor, 28...Reference voltage, 29...・・・
・Error amplifier, 30...Switching element, 3
1... Reference voltage, 32... Error amplifier, 33° 34... Drive circuit, 35.36...
···load.

Claims (1)

【特許請求の範囲】[Claims] 直流電源にスイッチング素子を介して接続した一次巻線
を有するスイッチングトランスの二次巻線に、整流平滑
回路からなる基本の出力回路と、整流平滑回路と出力電
圧を検出する補助電圧検出回路とこの補助電圧検出回路
によって制御されるスイッチング素子からなる補助出力
回路を1個以上接続し、上記基本の出力回路に電圧検出
回路を接続し、この電圧検出回路によって上記一次側の
スイッチング素子を制御するように構成した直流電源装
置。
The secondary winding of a switching transformer, which has a primary winding connected to a DC power source via a switching element, includes a basic output circuit consisting of a rectifier and smoothing circuit, an auxiliary voltage detection circuit that detects the rectifier and smoothing circuit, and an auxiliary voltage detection circuit that detects the output voltage. One or more auxiliary output circuits each consisting of a switching element controlled by an auxiliary voltage detection circuit are connected, a voltage detection circuit is connected to the basic output circuit, and the switching element on the primary side is controlled by this voltage detection circuit. DC power supply configured as follows.
JP22073589A 1989-08-28 1989-08-28 DC power supply Expired - Fee Related JP2841530B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP22073589A JP2841530B2 (en) 1989-08-28 1989-08-28 DC power supply

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP22073589A JP2841530B2 (en) 1989-08-28 1989-08-28 DC power supply

Publications (2)

Publication Number Publication Date
JPH0386072A true JPH0386072A (en) 1991-04-11
JP2841530B2 JP2841530B2 (en) 1998-12-24

Family

ID=16755707

Family Applications (1)

Application Number Title Priority Date Filing Date
JP22073589A Expired - Fee Related JP2841530B2 (en) 1989-08-28 1989-08-28 DC power supply

Country Status (1)

Country Link
JP (1) JP2841530B2 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008507950A (en) * 2004-07-26 2008-03-13 コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ Converter that provides multiple output voltages
KR200454589Y1 (en) * 2009-08-31 2011-07-12 라제건 Stabilizer cane
JP2012152101A (en) * 2011-01-20 2012-08-09 Osram Ag Power supply device

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008507950A (en) * 2004-07-26 2008-03-13 コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ Converter that provides multiple output voltages
KR200454589Y1 (en) * 2009-08-31 2011-07-12 라제건 Stabilizer cane
JP2012152101A (en) * 2011-01-20 2012-08-09 Osram Ag Power supply device

Also Published As

Publication number Publication date
JP2841530B2 (en) 1998-12-24

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