JPH08126308A - Switching power source - Google Patents

Switching power source

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Publication number
JPH08126308A
JPH08126308A JP26341694A JP26341694A JPH08126308A JP H08126308 A JPH08126308 A JP H08126308A JP 26341694 A JP26341694 A JP 26341694A JP 26341694 A JP26341694 A JP 26341694A JP H08126308 A JPH08126308 A JP H08126308A
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JP
Japan
Prior art keywords
circuit
switching
control circuit
power supply
dc
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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
Application number
JP26341694A
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Japanese (ja)
Inventor
Hironobu Shiroyama
博伸 城山
Original Assignee
Fuji Electric Co Ltd
富士電機株式会社
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Application filed by Fuji Electric Co Ltd, 富士電機株式会社 filed Critical Fuji Electric Co Ltd
Priority to JP26341694A priority Critical patent/JPH08126308A/en
Publication of JPH08126308A publication Critical patent/JPH08126308A/en
Application status is Pending legal-status Critical

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Abstract

PURPOSE: To provide a switching power source using a switching element which is reduced in electrical and thermal stresses and improved in long-term reliability by providing intermittent stop periods to the switching element.
CONSTITUTION: In a switching power source provided with a DC-DC converter equipped with a switching element 5 on the primary winding side of a transformer 3 across which a DC voltage is applied through a rectifier/smoothing circuit 2, a rectifier/smoothing circuit 4 on the secondary winding side, and an auxiliary power source circuit 6 on the ternary winding side and a control circuit 11 equipped with a secondary control circuit 13 which is operated by the electric power supplied from the circuit 6 and a switching control circuit 12 which controls the turning on/off of the switching element 5, a no-load detecting circuit 22 and switching control circuit 23 are provided. In addition, an intermittently stop circuit which outputs a signal 21S for instructing intermittent stops to the switching control circuit 12 when the no-load state of the DC-DC converter circuit 1 is detected is also provided.
COPYRIGHT: (C)1996,JPO

Description

【発明の詳細な説明】 DETAILED DESCRIPTION OF THE INVENTION

【0001】 [0001]

【産業上の利用分野】この発明は、無負荷状態でも制御電力の供給を必要とする動作表示器,動作監視器等の2 BACKGROUND OF THE INVENTION This invention, operation indicator requiring the supply of control power is also under no-load conditions, such as operation monitoring unit 2
次制御回路を制御装置内に備えたスイッチング電源に関する。 It relates to a switching power supply with the following control circuit in the control unit.

【0002】 [0002]

【従来の技術】図3は従来のスイッチング電源を簡略化して示す回路構成図であり、ACライン8の交流電力を直流電力に変換して負荷9に供給するスイッチング電源は、その主回路としてのDC−DCコンバータ回路1が整流平滑回路2を介して直流電圧が印加されるトランス3の1次巻線3P側に例えば自己消弧素子などのスイッチング素子5を,2次巻線3S側に整流平滑回路4を, BACKGROUND ART FIG. 3 is a circuit diagram schematically showing a conventional switching power supply, switching power supplies and converts the AC power of the AC line 8 into DC power to a load 9, as the main circuit the switching element 5 such as a DC-DC converter circuit 1 is the primary winding 3P side, for example, self-turn-off devices of the transformer 3 DC voltage through the rectifying smoothing circuit 2 is applied, a secondary winding 3S side rectifier a smoothing circuit 4,
3次巻線3T側にダイオード6Dおよびコンデンサ6C 3 winding 3T side diode 6D and capacitor 6C
からなる補助電源回路6をそれぞれ備え、その回路構成によりフライバックコンバータ,フォワードコンバータ,ブリッジコンバータなど種々のDC−DCコンバータが知られている。 An auxiliary power supply circuit 6 composed of each flyback converter, a forward converter, a variety of DC-DC converters, such as bridge converter is known by its circuit configuration. また、制御回路11は補助電源回路6の供給電力により動作する動作表示器,動作監視器, Further, the control circuit 11 operates the display device which operates by power supplied from the auxiliary power supply circuit 6, the operation monitoring unit,
およびその制御回路などを含む2次制御回路13と、スイッチング素子5を例えば所定の時比率でオンオフ制御するスイッチング制御回路12とを備え、スイッチング制御回路12の時比率制御方式の相違によりPWM信号方式,アクティブ高周波フィルタ方式など種々の制御回路が知られている。 And a secondary control circuit 13, including a control circuit, and a switching control circuit 12 for turning on and off the switching element 5, for example at a predetermined time ratio, PWM signaling due to a difference in the ratio control system when the switching control circuit 12 It is known various control circuits such as an active high-frequency filter method.

【0003】図4は従来のスイッチング電源におけるスイッチング素子の動作状態を示すタイムチャートであり、補助電源回路6の供給電力により動作する動作表示器,動作監視器,およびその制御回路などを含む2次制御回路13には、DC−DCコンバータ回路1に負荷電流I Lが流れない無負荷期間中にも、休みなく電力を供給してその表示機能,監視機能を維持する必要があるため、スイッチング素子5は無負荷状態でも休みなくスイッチングしてトランス3の3次巻線側に設けた補助電源回路6で電力を発生させ、その出力側に接続した2次制御回路13の動作を継続して維持するよう構成される。 [0003] Figure 4 is a time chart showing the operation states of the switching elements in the conventional switching power supply, the operation display unit operated by electric power supplied from the auxiliary power supply circuit 6, the operation monitoring unit, and a secondary, including a control circuit since the control circuit 13, even during DC-DC converter circuit unloaded period the load current I L does not flow 1, the display function by supplying the rest without power, it is necessary to maintain the monitoring function, the switching device 5 generates a power in the auxiliary power supply circuit 6 provided in the 3 winding side of the transformer 3 by switching around the clock, even at no-load state, continue to operate the secondary control circuit 13 connected to the output side maintained configured to.

【0004】 [0004]

【発明が解決しようとする課題】従来のスイッチング電源では、2次制御回路13への電力供給を無負荷状態でも継続して維持するために、スイッチング素子5を常時休みなくスイッチングしており、2次制御回路13への供給電力は小さくてもスイッチング損失が常時発生するため、スイッチング素子が電気的,熱的ストレスを常時受けることになり、これが原因でスイッチング素子として使用する自己消弧素子の寿命に悪影響を与えるという問題がある。 In THE INVENTION Problems to be Solved by the conventional switching power supply, in order to maintain continued even under no-load conditions the power supply to the secondary control circuit 13, which constantly break without switching the switching element 5, 2 since the switching losses also supply power to the next control circuit 13 decreases occurs constantly, will be switching element receives electrical, thermal stress constantly, the life of self-turn-off device which is used as a switching element because there is a problem that adversely affect the. また、スイッチング素子5のスイッチングを制御するスイッチング制御回路12内のスイッチング素子の寿命特性にも悪影響を与えるという問題がある。 Further, there is a problem that an adverse effect to life characteristics of the switching elements of the switching control circuit 12 for controlling the switching of the switching element 5.

【0005】この発明の目的は、スイッチング素子に間欠停止期間を設けることにより、長期信頼性を改善したスイッチング電源を提供することにある。 An object of the invention is to provide an intermittent stop period the switching element is to provide a switching power supply with improved long-term reliability.

【0006】 [0006]

【課題を解決するための手段】上述の課題を解決するために、この発明は、直流電圧が印加されるトランスの1 In order to solve the above problems BRIEF SUMMARY OF THE INVENTION The invention provides a transformer DC voltage is applied 1
次巻線側にスイッチング素子を,2次巻線側に整流平滑回路を,3次巻線側に補助電源回路をそれぞれ備えたD The switching element winding side, a rectifying smoothing circuit to the secondary winding side, each provided with an auxiliary power supply circuit 3 winding side D
C−DCコンバータ回路と、前記補助電源回路の供給電力により動作する2次制御回路,および前記スイッチング素子をオンオフ制御するスイッチング制御回路を有する制御回路とを備えたスイッチング電源において、DC And C-DC converter circuit, the secondary control circuit operates by the supply power of the auxiliary power supply circuit, and the switching power supply and a control circuit having a switching control circuit for on-off controlling the switching element, DC
−DCコンバータ回路が無負荷状態にあることを検知したとき間欠停止を指示する信号を前記スイッチング制御回路に向けて出力する間欠停止回路を備える。 -DC converter circuit comprises an intermittent stop circuit that outputs a signal for instructing the intermittent stop toward the switching control circuit when detecting that the no-load state.

【0007】間欠停止回路は無負荷検出回路と、その検出信号を受けて間欠停止信号を発する間欠停止パルス発生回路とを備えるよう構成すると良い。 [0007] Intermittent stop circuit may be configured to include a no-load detecting circuit, a intermittent stop pulse generator which emits intermittent stop signal receives this detection signal. 補助電源回路は3次巻線に直列接続されたダイオードおよびコンデンサを備え、このコンデンサが間欠休止期間中に蓄積充電電荷を2次制御回路に向けて連続供給するに足る静電容量を有するよう構成すると良い。 Auxiliary power supply circuit comprises a series connected diode and capacitor 3 windings, configured to have a capacitance which the capacitor is sufficient to continuously supply toward the secondary control circuit accumulated charges during the intermittent pause period Then good.

【0008】 [0008]

【作用】この発明においては、上記のように構成したことにより、DC−DCコンバータ回路が無負荷状態にあることを間欠停止回路が検知してスイッチング制御回路に向けて発する間欠停止信号により、スイッチング制御回路がその動作を間欠的に休止し、これに伴ってスイッチング素子もそのスイッチングを停止するので、間欠停止期間中スイッチング素子のスイッチング損失の発生を回避できることになり、スイッチング素子が受ける電気的,熱的ストレスを軽減してその寿命特性を長期化する機能が得られる。 [Action] In this invention, by the structure described above, the intermittent stop signal emanating toward the switching control circuit intermittent stop circuit detects that the DC-DC converter circuit is in the unloaded state, the switching the control circuit is intermittently suspended its operation, also stops the switching switching device with this, will be able to avoid the occurrence of the switching loss of the intermittent stop period in the switching device, the electrical switching element is subjected, ability to prolong the life characteristics to reduce the thermal stress is obtained. また、スイッチング制御回路もその間欠休止期間中電気的,熱的ストレスが軽減される。 The switching control circuit is also electrically during its intermittent pause period, thermal stress is reduced.

【0009】また、間欠停止回路の無負荷検出回路が負荷回路の電圧または電流を監視し、その検出信号を受けた間欠停止パルス発生回路がスイッチング制御回路に間欠停止,間欠駆動を一定の周期で指令することにより、 Further, the no-load detecting circuit for intermittent stop circuit monitors the voltage or current of the load circuit, intermittent stop the intermittent stop pulse generating circuit switching control circuit which receives the detection signal, the intermittent driving at a constant cycle by commanding,
スイッチング制御回路およびスイッチング素子の動作を間欠的に休止させることができる。 The operation of the switching control circuit and the switching element can be intermittently paused. さらに、補助電源回路の出力電圧の変動幅が一定範囲に納まるようコンデンサ容量および間欠停止周期を選択することにより、間欠停止期間中も2次制御回路に連続して電力を供給し、その機能を休みなく保持する機能が得られる。 Moreover, by variation range of the output voltage of the auxiliary power supply circuit to select the capacitance and intermittent stop period to fall within a certain range, supplying power continuously during the intermittent stop period in the secondary control circuit, its function the ability to rest without retention is obtained.

【0010】 [0010]

【実施例】以下この発明を実施例に基づいて説明する。 EXAMPLES The following will be described on the basis of the present invention to Examples.
図1はこの発明の実施例になるスイッチング電源を簡略化して示す回路構成図、図2は実施例になるスイッチング電源における動作状態を示すタイムチャートであり、 Figure 1 is a circuit diagram showing a switching power supply comprising a preferred embodiment of the present invention in a simplified manner, Figure 2 is a time chart showing an operating state of the switching power supply comprising the Examples,
従来例と同じ参照符号を付けた部材は従来例のそれと同じ機能をもつので、その説明を省略する。 Since the same reference numerals Paste members to the conventional example have the same function as that of the conventional example, description thereof is omitted. 図において、 In the figure,
間欠停止回路21は無負荷検出回路22と、その出力側に接続された間欠停止パルス発生回路23とで構成される。 Intermittent stop circuit 21 is composed of a no-load detecting circuit 22, and intermittent stop pulse generating circuit 23 connected to its output side. 無負荷検出回路22はDC−DCコンバータ回路1 No-load detecting circuit 22 is a DC-DC converter circuit 1
が無負荷状態にあることを例えば負荷電流I Lの検出信号により検知したとき出力側がHighレベルに変化する,例えば反転形の差動増幅回路などで構成される。 There the output upon detecting the detection signal of, for example, the load current I L that is in the unloaded state is changed to the High level, for example, a like differential amplifier circuit of inverting. また、間欠停止パルス発生回路23は無負荷検出回路22 Also, intermittent stop pulse generating circuit 23 is no load detection circuit 22
がDC−DCコンバータ回路1の無負荷状態を検知して発するHighレベルの信号を受けて、Highレベルの間欠停止信号21SおよびLowレベルの間欠駆動信号を一定の周期で交互にスイッチング制御回路12に向けて出力する。 There receives a High-level signal originating detects the no-load state of the DC-DC converter circuit 1, alternately intermittent driving signal of the intermittent stop signal 21S and Low level High level at a constant period to the switching control circuit 12 directed to output. その結果図2に示すように、Highレベルの間欠停止信号21Sを受けたスイッチング制御回路12がその出力駆動信号V Sの出力を一時停止することにより、DC−DCコンバータ回路1が無負荷状態となる期間中、スイッチング素子5がそのスイッチング動作を間欠的に一定の周期で繰り返すことになり、間欠停止期間中スイッチング素子5のスイッチング損失の発生を回避できるので、スイッチング素子が受ける電気的, As shown in the results Figure 2, by the switching control circuit 12 that has received the intermittent stop signal 21S of High level to pause the output of the output drive signal V S, DC-DC converter circuit 1 and a no-load condition during consisting period, results in the switching element 5 repeats intermittent constant period the switching operation, it is possible to avoid the occurrence of the switching loss of the intermittent stop period during switching element 5, the electrical switching element is subjected,
熱的ストレスを軽減してその寿命特性を長期化する信頼性の向上効果が得られる。 Improvement of reliability to prolong the life characteristics to reduce the thermal stress is obtained.

【0011】一方、トランス3の3次巻線3T側に設けた補助電源回路6は、その平滑コンデンサ6CがDC− [0011] The auxiliary power supply circuit 6 provided on the tertiary winding 3T side of the transformer 3, the smoothing capacitor 6C is DC-
DCコンバータ回路1が無負荷状態となる期間中、間欠駆動時に3次巻線に流れる電流により充電され,間欠停止時に蓄積充電電荷を2次制御回路22に向けて放電する動作を繰り返すことになる。 During DC converter circuit 1 becomes the unloaded condition, it is charged by the current flowing through the third winding to the intermittent drive to repeat the operation for discharging towards the storage charges during intermittent stop in the secondary control circuit 22 . そこで、蓄積充電電荷の放電期間中コンデンサ6Cが一定レベルの電圧を保持するよう、その静電容量および放電時間(間欠停止期間) Therefore, as the capacitor 6C during the discharge period of accumulation charges to maintain a constant level of voltage, the electrostatic capacity and discharge time (intermittent stop period)
を決めておくことにより、DC−DCコンバータ回路1 By keeping decide, DC-DC converter circuit 1
が無負荷状態となる期間中も補助電源回路6から2次制御回路22に電力を連続供給し、動作表示器,動作監視器,およびその制御回路などの機能を安定して保持できる利点が得られる。 Obtained but also during a period when the no-load state continuously supplying power from the auxiliary power circuit 6 to the secondary control circuit 22, operation indicator, the operation monitoring unit, and the advantage of the features such that the control circuit can be maintained stably It is.

【0012】 [0012]

【発明の効果】この発明は前述のように、間欠停止回路を設けてDC−DCコンバータ回路が無負荷状態にある期間中、スイッチング素子のスイッチングを駆動,停止を一定周期で繰り返すよう構成した。 Effects of the Invention The present invention as described above, DC-DC converter circuit provided with intermittent stop circuit during a period in the unloaded state, driving the switching of the switching element, configured to repeat a stop at a predetermined period. その結果、無負荷期間中もスイッチング素子を連続的に駆動する従来のスイッチング電源で問題になった、スイッチング損失およびこれに起因する電気的,熱的ストレスを軽減し、スイッチング素子の寿命特性を長期化できるので、スイッチング素子の長期信頼性に優れたスイッチング電源を提供できる利点が得られる。 As a result, during the unloaded period became a problem in the conventional switching power supply for continuously driving the switching element, electrically due to switching loss and this thermal stress to reduce long-term life characteristics of the switching element since it of advantage that can provide excellent switching power supply long-term reliability of the switching element is obtained.

【0013】また、補助電源回路のコンデンサ容量を増すよう構成すれば、間欠停止期間中コンデンサの蓄積電荷を放出することにより2次制御回路に電力を連続供給できるので、動作表示器,動作監視器,およびその制御回路などの機能を安定して保持できる利点が得られる。 Further, if configured to increase the capacitance of the auxiliary power supply circuit, it is possible to continuously supply power to the secondary control circuit by releasing the stored charge in the intermittent stop period capacitor, operation indicator, operation monitoring device , and stable advantage of holding is obtained functions such as the control circuit.

【図面の簡単な説明】 BRIEF DESCRIPTION OF THE DRAWINGS

【図1】この発明の実施例になるスイッチング電源を簡略化して示す回路構成図 [1] circuit diagram schematically showing a switching power supply comprising a preferred embodiment of the present invention

【図2】実施例になるスイッチング電源における動作状態を示すタイムチャート Figure 2 is a time chart showing an operating state of the switching power supply comprising in Example

【図3】従来のスイッチング電源を簡略化して示す回路構成図 Figure 3 is a circuit diagram schematically showing a conventional switching power supply

【図4】従来のスイッチング電源における動作状態を示すタイムチャート [4] Conventional time chart showing an operating state of the switching power supply

【符号の説明】 DESCRIPTION OF SYMBOLS

1 DC−DCコンバータ回路 2 整流平滑回路 3 トランス 4 整流平滑回路 5 スイッチング素子 6 補助電源回路 6D ダイオード 6C コンデンサ 11 制御回路 12 スイッチング制御回路 13 2次制御回路 21 間欠停止回路 21S 間欠停止信号 22 無負荷検出回路 23 間欠停止パルス発生回路 V S駆動信号 I L負荷電流 1 DC-DC converter circuit 2 rectifying smoothing circuit 3 transformer 4 rectifying and smoothing circuit 5 the switching element 6 auxiliary power supply circuit 6D diode 6C capacitor 11 control circuit 12 switching control circuit 13 secondary control circuit 21 stops intermittently circuit 21S intermittent stop signal 22 no load detection circuit 23 stops intermittently pulse generator V S drive signal I L the load current

Claims (3)

    【特許請求の範囲】 [The claims]
  1. 【請求項1】直流電圧が印加されるトランスの1次巻線側にスイッチング素子を,2次巻線側に整流平滑回路を,3次巻線側に補助電源回路をそれぞれ備えたDC− The method according to claim 1 the switching element to the primary winding of the transformer to which a DC voltage is applied, the rectifying and smoothing circuit on the secondary winding side, each provided with an auxiliary power supply circuit 3 winding side DC-
    DCコンバータ回路と、前記補助電源回路の供給電力により動作する2次制御回路,および前記スイッチング素子をオンオフ制御するスイッチング制御回路を有する制御回路とを備えたスイッチング電源において、DC−D DC converter circuit, the secondary control circuit operates by the supply power of the auxiliary power supply circuit, and the switching power supply and a control circuit having a switching control circuit for on-off controlling the switching element, DC-D
    Cコンバータ回路が無負荷状態にあることを検知したとき間欠停止を指示する信号を前記スイッチング制御回路に向けて出力する間欠停止回路を備えたことを特徴とするスイッチング電源。 Switching power supply C converter circuit is characterized in that it comprises an intermittent stop circuit that outputs a signal for instructing the intermittent stop toward the switching control circuit when detecting that the no-load state.
  2. 【請求項2】間欠停止回路が無負荷検出回路と、その検出信号を受けて間欠停止信号を発する間欠停止パルス発生回路とを有することを特徴とする請求項1記載のスイッチング電源。 Wherein the intermittent stop circuit unloaded detecting circuit, a switching power supply according to claim 1, characterized by having a intermittent stop pulse generator which emits intermittent stop signal receives this detection signal.
  3. 【請求項3】補助電源回路が3次巻線に直列接続されたダイオードおよびコンデンサからなり、このコンデンサが間欠休止期間中に蓄積充電電荷を2次制御回路に向けて連続供給するに足る静電容量を有することを特徴とする請求項1記載のスイッチング電源。 Wherein the auxiliary power supply circuit is a series connected diode and capacitor 3 windings, electrostatic this capacitor enough to continuously supply toward the secondary control circuit accumulated charges during the intermittent pause period switching power supply according to claim 1, characterized in that it has a capacity.
JP26341694A 1994-10-27 1994-10-27 Switching power source Pending JPH08126308A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP26341694A JPH08126308A (en) 1994-10-27 1994-10-27 Switching power source

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP26341694A JPH08126308A (en) 1994-10-27 1994-10-27 Switching power source

Publications (1)

Publication Number Publication Date
JPH08126308A true JPH08126308A (en) 1996-05-17

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Family Applications (1)

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JP26341694A Pending JPH08126308A (en) 1994-10-27 1994-10-27 Switching power source

Country Status (1)

Country Link
JP (1) JPH08126308A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6972970B2 (en) 2002-09-04 2005-12-06 Sanken Electric Co., Ltd. Dc-to-dc converter
JP2010246246A (en) * 2009-04-03 2010-10-28 Mitsubishi Electric Corp Power supplying device

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6972970B2 (en) 2002-09-04 2005-12-06 Sanken Electric Co., Ltd. Dc-to-dc converter
CN100359790C (en) * 2002-09-04 2008-01-02 三垦电气株式会社 Dc-to-dc converter
JP2010246246A (en) * 2009-04-03 2010-10-28 Mitsubishi Electric Corp Power supplying device

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