JPH0340719A - Protective device for power supply circuit - Google Patents
Protective device for power supply circuitInfo
- Publication number
- JPH0340719A JPH0340719A JP17474989A JP17474989A JPH0340719A JP H0340719 A JPH0340719 A JP H0340719A JP 17474989 A JP17474989 A JP 17474989A JP 17474989 A JP17474989 A JP 17474989A JP H0340719 A JPH0340719 A JP H0340719A
- Authority
- JP
- Japan
- Prior art keywords
- output
- circuit
- power supply
- error amplifier
- capacitor
- 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
Links
- 230000001681 protective effect Effects 0.000 title abstract description 9
- 238000001514 detection method Methods 0.000 claims abstract description 37
- 230000005856 abnormality Effects 0.000 claims abstract description 14
- 230000003068 static effect Effects 0.000 claims description 7
- 239000003990 capacitor Substances 0.000 abstract description 15
- 230000001052 transient effect Effects 0.000 abstract description 4
- 230000002159 abnormal effect Effects 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 12
- 238000004804 winding Methods 0.000 description 6
- 238000010891 electric arc Methods 0.000 description 5
- 230000007423 decrease Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000009499 grossing Methods 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 230000003111 delayed effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
Landscapes
- Protection Of Static Devices (AREA)
- Dc-Dc Converters (AREA)
- Power Conversion In General (AREA)
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
本発明は電気機器の電源回路に係り、特に出力異常時に
出力回路素子および出力負荷にかかるエネルギーを仰え
る機能を有した電源回路の保護装置に関するものである
。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a power supply circuit for electrical equipment, and more particularly to a protection device for a power supply circuit having a function of measuring the energy applied to an output circuit element and an output load in the event of an output abnormality. It is.
従来の技術
電源回路の保護装置として、一般に第８図に示すような
回路が使用されている、第１０図において８は静止型変
換器としてＤＣ−ＤＣコンバータを使用したもので、出
力端子に接続されている。Conventional technology As a protection device for a power supply circuit, a circuit as shown in Fig. 8 is generally used. In Fig. 10, 8 is a stationary converter using a DC-DC converter, which is connected to the output terminal. has been done.
上記ＤＣ−ＤＣコンバータ８の入出力特性は、その入力
が上昇すると出力も上昇し、かつ２人力の低い方で出力
が決定される特性である。９はＤＣ−ＤＣコンバータ８
の出力側に接続され、出力検出信号１０と出力異常検出
信号１１を発生する出力検出回路である。１は第１の入
力に基準電源２゜第２の入力に上記出力検出信号１０が
接続され、上記第１と第２の入力の差を増幅し、電源回
路の出力制御を行う出力制御用誤差増幅器で、その出力
から入力側に局部負帰還する位相補償回路３が接続され
ている。そして上記出力制御用誤差増幅器１の出力は、
上記ＤＣ−ＤＣＣ−式−タ８の入力に接続されている。The input/output characteristics of the DC-DC converter 8 are such that as the input increases, the output also increases, and the output is determined by the lower of the two manpowers. 9 is a DC-DC converter 8
This is an output detection circuit that is connected to the output side of the circuit and generates an output detection signal 10 and an output abnormality detection signal 11. 1 is a reference power supply 2 to the first input, the output detection signal 10 is connected to the second input, and an output control error that amplifies the difference between the first and second inputs and controls the output of the power supply circuit. The amplifier is connected from its output to its input side with a phase compensation circuit 3 that provides local negative feedback. The output of the output control error amplifier 1 is
It is connected to the input of the DC-DCC type data converter 8.
４ａば、第１の入力が接地レベル、第２の入力に上記出
力異常検出信号１１が接続され、その出力により、電源
回路の出力保護を行う保護用誤差増幅器で、その出力か
ら入力側に局部負帰還する位相補償回路６が接続されて
いる。そして上記保護用誤差増幅器４１Ｌの出力は上記
ＤＣ−ＤＣＣ−式−タ８の入力に接続されている。4a, the first input is connected to the ground level, the second input is connected to the output abnormality detection signal 11, and the output is used to protect the output of the power supply circuit. A phase compensation circuit 6 that provides negative feedback is connected. The output of the protective error amplifier 41L is connected to the input of the DC-DCC type converter 8.
上記回路構成において以下回路動作について説明する。The circuit operation in the above circuit configuration will be explained below.
出力制御用誤差増幅器１とｌｏ−ＤＣコンバータ８と出
力検出回路９の抵抗９１，９２は負帰還ループを構成し
て訃り、電源出力電圧を安定化させている。保護用誤差
増幅器４ａも、上記ＤＣ−ＤＣＣ−式−タ８と上記出力
検出回路９の抵抗９４で負帰還ループを構成しているが
、上記検出回路９の抵抗９４に発生する出力異常検出信
号１１は（１）式のようになり、基準電源２と上記抵抗
９４で減算回路を構成し、上記保護用誤差増幅器。ＩＬ
の比較レベルを接地レベルで行い抵抗９４の電圧降下が
基準電圧と等しくなることにより、電源出力電流を安定
化させている。The output control error amplifier 1, the lo-DC converter 8, and the resistors 91 and 92 of the output detection circuit 9 form a negative feedback loop to stabilize the power supply output voltage. The protective error amplifier 4a also constitutes a negative feedback loop with the DC-DCC formula 8 and the resistor 94 of the output detection circuit 9, and the output abnormality detection signal generated in the resistor 94 of the detection circuit 9 11 is as shown in equation (1), and the reference power supply 2 and the resistor 94 constitute a subtraction circuit, and the protection error amplifier. IL
By performing the comparison level at the ground level and making the voltage drop across the resistor 94 equal to the reference voltage, the power supply output current is stabilized.
出力異常検出信号１１＝基準電圧２−
抵抗９４×出力電流 ・・・・・・・・・・・・・・（
１）式第１１図に従来の電源回路の保護装置の電源出力
短絡時の出力電流波形を示す。Output abnormality detection signal 11 = Reference voltage 2 - Resistor 94 x Output current ・・・・・・・・・・・・・・・(
1) Equation FIG. 11 shows the output current waveform of a conventional power supply circuit protection device when the power supply output is short-circuited.
発明が解決しようとする課題
ところがこのような従来の構成では、保護用誤差増幅器
４ａの過渡応答が位相補償回路６によ）その時定数分だ
け遅れてしまい、その遅れ時間の間は上記ＤＣ−ＤＣＣ
−式−タ８の出力回路素子に過大なストレスが加わって
し１うことになり、また、電源出力短絡時における出力
電流の実効値が第１１図に示すように大きいため、出力
回路素子の損焼を１ねく恐れがある。そのため、出力回
路素子に大きな定格の高価なものを使用する必要がある
。また出力保護動作を行わせる手段として誤差増幅器を
使用するため、保護用誤差増幅器４ａにも位相補償回路
６が必要で、回路が複雑となり、部品点数が多く、コス
トの低減が困難である。Problem to be Solved by the Invention However, in such a conventional configuration, the transient response of the protective error amplifier 4a is delayed by the time constant of the phase compensation circuit 6, and during this delay time, the DC-DCC
-Excessive stress will be applied to the output circuit element of Equation 8, and the effective value of the output current when the power supply output is short-circuited is large as shown in Fig. 11, so the output circuit element of There is a risk of fire damage. Therefore, it is necessary to use expensive output circuit elements with large ratings. Further, since an error amplifier is used as a means for performing the output protection operation, the phase compensation circuit 6 is also required for the protection error amplifier 4a, which makes the circuit complex and requires a large number of parts, making it difficult to reduce costs.
課題を解決するための手段
前記課題を解決するために本発明の電源回路の保護装置
は、誤差増幅器により制御される静止型変換器と、この
静止型変換器の出力側に出力検出回路を設け、この出力
検出回路の出力検出信号と基準電圧との差を上記誤差増
幅器により増幅するどともに、出力異常検出回路の信号
によって動作する第１のスイッチ素子を上記誤差増幅器
の出力側に上記第１のスイッチ素子がオンしたとき、出
力が停止するように接続し、上記誤差増幅器に誤差増幅
器の出力を入力側に帰還させる位相補償回路を設け、直
流固定電位と上記位相補償回路と上記第１のスイッチ素
子に直列に第２のスイッチ素子を接続したものである。Means for Solving the Problems In order to solve the above problems, the power supply circuit protection device of the present invention includes a static converter controlled by an error amplifier and an output detection circuit on the output side of the static converter. , the difference between the output detection signal of the output detection circuit and the reference voltage is amplified by the error amplifier, and a first switch element operated by the signal of the output abnormality detection circuit is connected to the output side of the error amplifier. The error amplifier is connected so that the output is stopped when the switch element is turned on, and the error amplifier is provided with a phase compensation circuit that feeds back the output of the error amplifier to the input side. A second switch element is connected in series to the switch element.
また本発明の他の構成の電源回路の保護装置は。Further, there is a protection device for a power supply circuit having another configuration according to the present invention.
第２のスイッチ素子として整流器を使ったものである。A rectifier is used as the second switching element.
作用
上記構成とすることにより、出力異常時の過渡期にかけ
る出力回路素子および出力負荷にかかるストレスを抑制
する機能を簡単かつ安価に得ることができる。Effect: With the above configuration, it is possible to easily and inexpensively obtain the function of suppressing the stress applied to the output circuit elements and output load during the transition period when the output is abnormal.
実施例
以下本発明の一実施例について図面を参照しながら説明
する。第１図は本発明の第１の構成の一実施例にふ・け
るプラス定電圧電源回路の保護装置を示すものである。EXAMPLE An example of the present invention will be described below with reference to the drawings. FIG. 1 shows a protection device for a positive constant voltage power supply circuit according to an embodiment of the first configuration of the present invention.
な訃第１０図と同等のものは同符号を付し、その構成の
説明を省略する。第８図と異なる点は、保護用誤差増幅
器４１Ｌが保護用コンパレータ４ｂになった点と、上記
保護用コンパレータ４ｂが単なる電圧コンパレータのた
め、位相補償回路６が不要となった点と、上記保護用コ
ンパレータ４ｂの出力により連動でオン、オフ制御され
る第１のスイッチ素子１２と第２のスイッチ素子１３が
接続された点である。上記第１のスイッチ素子１２は出
力制御用誤差増幅器１の出力に、この出力を短絡するよ
うに接続されている。上記第２のスイッチ素子１３は基
準電源２と位相補償回路３と第１のスイッチ素子１２に
直列に接続されている。Components equivalent to those in FIG. 10 are designated by the same reference numerals, and explanations of their configurations will be omitted. The differences from FIG. 8 are that the protective error amplifier 41L has become a protective comparator 4b, that the protective comparator 4b is just a voltage comparator, so the phase compensation circuit 6 is no longer necessary, and that This is the point where the first switch element 12 and the second switch element 13, which are controlled to be turned on and off in conjunction with each other by the output of the comparator 4b, are connected. The first switching element 12 is connected to the output of the output control error amplifier 1 so as to short-circuit this output. The second switching element 13 is connected in series to the reference power supply 2, the phase compensation circuit 3, and the first switching element 12.
上記位相補償回路３は、コンデンサ３１と抵抗３２で構
成され、抵抗３２の抵抗値は、出力検出回路９の抵抗９
１．９２の台底インピーダンスより充分小さいものであ
る。The phase compensation circuit 3 is composed of a capacitor 31 and a resistor 32, and the resistance value of the resistor 32 is the same as that of the resistor 9 of the output detection circuit 9.
This is sufficiently smaller than the base impedance of 1.92.
また、上記出力制御用誤差増幅器１は電流出力型（トラ
ンスコンダクタンスアンプ）を使用しているので特性上
出力インピーダンスが非常に高く、その出力短絡時に大
電流が流れないものである。Further, since the output control error amplifier 1 uses a current output type (transconductance amplifier), its output impedance is extremely high due to its characteristics, and a large current does not flow when the output is short-circuited.
上記回路構成において以下回路動作について説明する。The circuit operation in the above circuit configuration will be explained below.
ここに電源出力が短絡で出力検出回路９の抵抗９４に発
生した出力異常検出信号１１が接地レベルに達すると、
上記保護用コンパレータ４ｂは第１のスイッチ素子１２
と第２のスイッチ素子１３を連動でオンにするため、出
力制御用誤差増幅器１の出力を強制的にローにし、ＤＣ
−ＩＩＣコンバータ８の入力も同じくローとなるため電
源出力は瞬時に停止する。本発明の場合、４ｂは単なる
電圧コンパレータであるので、その過渡応答は誤差増幅
器に比べて非常に早く、遅れ時間がほとんどないため、
上記ＤＣ−ＤＣコンバータ８の出力回路に過大なストレ
スをほとんど加えずに電源出力を瞬時に停止させること
ができる。上記停止する過渡期に訃いては、位相補償回
路３のコンデンサ３１は、一方が第２のスイッチ素子１
３を通じて基準電源２に接続され、他方が抵抗３２と第
１のスイッチ素子１２を通じて接地レベルに接続される
ため上記基準電源２の電位筐で第１図に示す極性でコン
デンサ３１と抵抗３２の時定数で急速に充電される。そ
して電源出力が停止すると出力異常検出信号１１が０と
なり保護用コンパレータ４ｂは第１．第２のスイッチ素
子１２．１３を連動でオフにするため出力は上昇する方
向に向かう。上記上昇する方向にふ・いて上記位相補償
回路３のコンデンサ３１は、上記出力検出回路９の抵抗
９１．９２の台底インピーダンスとによる時定数でゆっ
くう放電する。そして再び出力電流が設定したレベルに
達すると同様の動作を繰り返す。When the power supply output is short-circuited and the output abnormality detection signal 11 generated in the resistor 94 of the output detection circuit 9 reaches the ground level,
The protection comparator 4b is the first switch element 12
In order to turn on the second switch element 13 in conjunction with the output control error amplifier 1, the output of the output control error amplifier 1 is forced to be low, and
- Since the input of the IIC converter 8 also becomes low, the power output stops instantly. In the case of the present invention, since 4b is simply a voltage comparator, its transient response is much faster than that of an error amplifier, and there is almost no delay time.
The power output can be stopped instantaneously without applying excessive stress to the output circuit of the DC-DC converter 8. During the above-mentioned stopping transition period, one of the capacitors 31 of the phase compensation circuit 3 is connected to the second switch element 1.
3 to the reference power supply 2, and the other to the ground level through the resistor 32 and the first switch element 12. Therefore, when the capacitor 31 and the resistor 32 have the polarity shown in FIG. Charges rapidly at a constant rate. Then, when the power output stops, the output abnormality detection signal 11 becomes 0, and the protection comparator 4b becomes the first. Since the second switch elements 12 and 13 are turned off in conjunction with each other, the output tends to rise. In the rising direction, the capacitor 31 of the phase compensation circuit 3 is slowly discharged with a time constant determined by the bottom impedance of the resistors 91 and 92 of the output detection circuit 9. Then, when the output current reaches the set level again, the same operation is repeated.
従って上記出力制御用誤差増幅器１の出力波形は第２図
に示すような波形となる。すなわち急速停止ソフトスタ
ートを繰り返す動作となる。Therefore, the output waveform of the output control error amplifier 1 has a waveform as shown in FIG. In other words, the operation is a repeated rapid stop and soft start.
第３図は本発明の第１の構成のマイナス定電流電源回路
の保護装置を示すものである。なお第１図と同等のもの
は同符号を付し、その構成の説明を省略する。電源出力
が定電流の場合には特に短絡保護を施こさなくても良い
が、出力回路素子にかかるストレスを極少にしたいとか
、あるいは電子写真装置用の高圧電源等で負荷の短絡ま
たはアーク等で感光ドラムに傷をつけるのを最小にした
いとか、感電お・よび火災防止の面で、短絡・アーク時
の電流の実効値を下げたい場合に非常に有効である。第
３図において電源出力電流は出力検出回路９の９１．９
２の直列合成抵抗により出力検出信号１０として検出さ
れる。出力制御用誤差増幅器１の第２の入力へ出力検出
信号１ｏを接続することにより基準電源２との差を増幅
し、その出力をＤＣ−ＤＣコンバータ８の入力に接続し
、負帰還ループを構成し、出力電流を安定化させている
。ｔた、保護用コンパレータ４ｂの第２の入力へ出力異
常検出信号１１を接続し、第１の入力へ基準電源２を接
続している。上記回路構成で定電流制御させ、負荷を小
さくしていくと、短絡付近ではＤＣ−ＤＣコンバータ８
は間欠発振状態となり、出力電流リップルが著しく増大
し上記抵抗９２に発生する電圧のピーク値が大きくなる
。また出力アーク放電時にふ・いてもスパイク状に電流
が大きく流れるため上記抵抗９２に発生する電圧のピー
ク値が大きくなる。すると保護用コンパレータ４ｂが動
作し、第１図と同様の保護動作が行われる。上記ＤＣ−
ＤＣコンバータ８は第２図に示すＰレベルを超えるとＤ
Ｃ−ＤＣコンバータ８の出力が上昇し、Ｐレベルより下
がるとＤ Ｃ−ＤＣコンバータ８の出力が停止するため
、電源出力短絡時に電源出力に流れる電流波形は第４図
に示すように休止期間を含む波形となり、その実効値は
、従来例の第１０図、第１１図の電流波形に比べて著し
く低くなっている。また電源出力アーキング時に電源出
力に流れる電流波形は、アーク放電が起こると、出力電
圧が一旦ＯＶになりアークを停止させてから再びソフト
スタートにより出力電圧が上昇するので連続しなくなり
、第６図に示すようにスパイク状になり、さらにその実
効値は低くなる。FIG. 3 shows a protection device for a negative constant current power supply circuit having the first configuration of the present invention. Components that are equivalent to those in FIG. 1 are given the same reference numerals, and explanations of their configurations will be omitted. If the power supply output is a constant current, there is no need to provide short-circuit protection, but if you want to minimize the stress on the output circuit elements, or if you are using a high-voltage power supply for an electrophotographic device, etc., you may want to protect it from short circuits or arcs in the load. This is very effective when you want to minimize damage to the photosensitive drum, or when you want to lower the effective value of current in the event of a short circuit or arc, in order to prevent electric shock and fire. In FIG. 3, the power supply output current is 91.9 of the output detection circuit 9.
The output detection signal 10 is detected by the two series combined resistors. By connecting the output detection signal 1o to the second input of the output control error amplifier 1, the difference from the reference power source 2 is amplified, and its output is connected to the input of the DC-DC converter 8, forming a negative feedback loop. This stabilizes the output current. Furthermore, the output abnormality detection signal 11 is connected to the second input of the protection comparator 4b, and the reference power source 2 is connected to the first input. When the above circuit configuration performs constant current control and reduces the load, the DC-DC converter 8
becomes an intermittent oscillation state, the output current ripple increases significantly, and the peak value of the voltage generated across the resistor 92 increases. Furthermore, even if the output arc discharges, a large spike-like current flows, so that the peak value of the voltage generated across the resistor 92 becomes large. Then, the protection comparator 4b operates, and the same protection operation as in FIG. 1 is performed. Above DC-
When the DC converter 8 exceeds the P level shown in FIG.
When the output of the C-DC converter 8 rises and falls below the P level, the output of the DC-DC converter 8 stops, so the current waveform flowing to the power output when the power output is short-circuited has a rest period as shown in Figure 4. The effective value thereof is significantly lower than the current waveform of the conventional example shown in FIGS. 10 and 11. In addition, the current waveform flowing through the power supply output during power supply output arcing becomes discontinuous when arc discharge occurs, as the output voltage once reaches OV and stops the arc, and then rises again due to soft start, and is not continuous, as shown in Figure 6. As shown, it becomes spike-like and its effective value further decreases.
第６図は本発明の第１の構成の交流電源回路の保護装置
を示すものである。なお第１図と同等のものは同符合を
付し、その構成の説明を省略する。FIG. 6 shows a protection device for an AC power supply circuit having a first configuration of the present invention. Components that are equivalent to those in FIG. 1 are given the same reference numerals, and explanations of their configurations will be omitted.
第６図において８は静止型変換器で内部に入力巻線８１
と出力巻線８２と検出巻線８３で構成されたトランスを
備えたＤＯ−ムＣインバータである。In Fig. 6, 8 is a static converter with an input winding 81 inside.
This is a DO-M C inverter equipped with a transformer composed of an output winding 82 and a detection winding 83.
出力検出回路９は上記検出巻線８３に発生した交流電圧
をプラスの直流電圧に両波整流するダイオード９０と分
圧する抵抗９１．９２と平滑するコンデンサ９３、抵抗
９４で構成された出力検出信号１０と、上記出力巻線８
２の巻き始め側から出力電流を検出する抵抗９６とその
検出電圧をプラスの直流電圧に整流するダイオード９７
と平滑するコンデンサ９８、抵抗９９で構成された出力
異常信号１１で構成されている。上記構成とすることで
第１図の実施例と同等の保護動作を行わせることができ
る。The output detection circuit 9 includes a diode 90 for double-wave rectification of the AC voltage generated in the detection winding 83 into a positive DC voltage, resistors 91 and 92 for voltage division, a smoothing capacitor 93, and a resistor 94. and the above output winding 8
A resistor 96 detects the output current from the winding start side of No. 2, and a diode 97 rectifies the detected voltage into a positive DC voltage.
The output abnormality signal 11 is composed of a smoothing capacitor 98 and a resistor 99. With the above configuration, it is possible to perform the same protection operation as the embodiment shown in FIG.
第７図は本発明の第２の構成の実施例に釦けるプラス定
電圧電源回路の保護装置を示すものである。なお第１図
と同等のものは同符合を付し、その構成の説明を省略す
る。第１図と異なる点は基準電源２と位相補償３と第１
のスイッチ素子１２に直列に接続されていた第２のスイ
ッチ素子１３の化９にダイオード１４を接続した点であ
る。FIG. 7 shows a protection device for a positive constant voltage power supply circuit according to a second embodiment of the present invention. Components that are equivalent to those in FIG. 1 are given the same reference numerals, and explanations of their configurations will be omitted. The points that differ from Fig. 1 are the reference power supply 2, phase compensation 3, and
The point is that a diode 14 is connected to the second switch element 13, which was connected in series to the switch element 12.
電源出力短絡時には位相補償回路３のコンデンサ３１へ
基準電源２の電位からダイオード１４の順方向電圧を引
いた電圧１で急速にコンデンサ３１と抵抗３２の時定数
で充電する。その後、第１のスイッチ素子１２がオフに
なると、上記位相補償回路３のコンデンサ３１と出力検
出回路９の抵抗９１．９２との合成インピーダンスによ
る時定数でゆっくり放電する。従って上記出力制御用誤
差増幅器１の出力波形は第８図に示すようにダイオード
１４の順方向電圧分だけ高い波形となる。なお、ダイオ
ード１４のアノードを基準電源２の代りに直流固定電位
１５へ接続し、直流固定電位１５の電圧を基準電源２の
電圧よりダイオード１４の順方向電圧分だけ高く設定し
ておけば、上記位相補償回路３へ急速に充電する時にダ
イオード１４の順方向電圧分をキャンセルできるため、
出力制御用誤差増幅器１の出力波形は第２図に示すもの
が得られる。When the power supply output is short-circuited, the capacitor 31 of the phase compensation circuit 3 is rapidly charged with a voltage 1 obtained by subtracting the forward voltage of the diode 14 from the potential of the reference power supply 2 using the time constant of the capacitor 31 and the resistor 32. Thereafter, when the first switch element 12 is turned off, it slowly discharges with a time constant determined by the combined impedance of the capacitor 31 of the phase compensation circuit 3 and the resistor 91.92 of the output detection circuit 9. Therefore, the output waveform of the output control error amplifier 1 becomes higher by the forward voltage of the diode 14, as shown in FIG. Note that if the anode of the diode 14 is connected to the DC fixed potential 15 instead of the reference power supply 2 and the voltage of the DC fixed potential 15 is set higher than the voltage of the reference power supply 2 by the forward voltage of the diode 14, the above can be achieved. Since the forward voltage of the diode 14 can be canceled when rapidly charging the phase compensation circuit 3,
The output waveform of the output control error amplifier 1 shown in FIG. 2 is obtained.
第９図は本発明の第１の構成の一実施例におけるプラス
定電圧電源回路の保護装置を示すものである。なお第１
図と同等のものは同符合を付し、その構成の説明を省略
する。第１図と異なる点はＤＣ−ＤＣコンバータ８の入
力レベルが上昇スると電源出力が低下するモードになっ
ている点で第１のスイッチ素子１２は直流固定電位１６
へ接続され、第２のスイッチ素子１３は接地レベルへ接
続されている。渣た、上記第２のスイッチ素子１３と基
準電源２の間には抵抗１６が接続されており、その抵抗
値は位相補償回路３の抵抗３２の抵抗値より充分大きい
ものである。FIG. 9 shows a protection device for a positive constant voltage power supply circuit in an embodiment of the first configuration of the present invention. Note that the first
Components equivalent to those in the figures are given the same reference numerals, and explanations of their configurations will be omitted. The difference from FIG. 1 is that the mode is such that when the input level of the DC-DC converter 8 increases, the power supply output decreases;
The second switch element 13 is connected to ground level. A resistor 16 is connected between the second switching element 13 and the reference power source 2, and its resistance value is sufficiently larger than the resistance value of the resistor 32 of the phase compensation circuit 3.
上記回路構成において以下回路動作について説明する。The circuit operation in the above circuit configuration will be explained below.
ここに電源出力が短絡で出力異常検出信号１１により保
護用コンパレータ４ｂが第１．第２のスイッチ素子１２
．１３を連動でオンにすると、静止型変換器８の入力に
直流固定電位１６が接続されるため電源出力は瞬時に停
止する。同時に位相補償回路３のコンデンサ３１は第２
のスイッチ素子１３を通じて接地レベルへ接続され、上
記直流固定電位１６から第９図に示す極性で急速充電さ
れる。その後第１．第２のスイッチ素子１２、ｉ３が連
動でオフになると上記位相補隈回路３のコンデンサ３１
と抵抗１６の時定数でゆっくり放電する。以後同様の動
作を繰り返し、電源出力の保護を行う。Here, the power supply output is short-circuited and the output abnormality detection signal 11 causes the protective comparator 4b to switch to the first. Second switch element 12
．． 13 is turned on in conjunction, the DC fixed potential 16 is connected to the input of the static converter 8, so the power output stops instantaneously. At the same time, the capacitor 31 of the phase compensation circuit 3
It is connected to the ground level through the switch element 13, and is rapidly charged from the DC fixed potential 16 with the polarity shown in FIG. After that, the first. When the second switch element 12 and i3 are turned off in conjunction with each other, the capacitor 31 of the phase compensation circuit 3
and discharge slowly with the time constant of the resistor 16. After that, the same operation is repeated to protect the power output.
本発明の一連の実施例において、出力制御用誤差増幅器
は全て電流出力型で述べてきたが、電圧出力型にお・い
ても上記出力制御用誤差増幅器１の出力に直列に電流制
限用素子（抵抗）を接続し、出力インピーダンスを上げ
ることにより同様の電源回路の保護装置が構成できるこ
とはいう１でもない。In the series of embodiments of the present invention, all output control error amplifiers have been described as current output types, but even in voltage output types, a current limiting element ( It goes without saying that a similar protection device for a power supply circuit can be constructed by connecting a resistor) and increasing the output impedance.
発明の効果
以上述べてきたように本発明によれば、次のような利点
がある。Effects of the Invention As described above, the present invention has the following advantages.
（１）出力回路素子として定格の小さい小型で安価なも
のが使用できる。(1) Small, inexpensive devices with low ratings can be used as output circuit elements.
（２）短絡、アーク時の電流の実効値を小さくすること
ができるので高圧電源において感電、アークによる火災
、安全規格の面で非常に有利であり、特に電子写真機の
場合、コロナ放電器と感光ドラムの間の短絡、アークに
よるドラム破壊防止に著しい効果がある。(2) It is possible to reduce the effective value of the current during short circuits and arcs, which is very advantageous in terms of electric shocks, fires caused by arcs, and safety standards in high-voltage power supplies. It is extremely effective in preventing short circuits between photosensitive drums and damage to the drums due to arcing.
（３）ＩＣ化する場合、ソフトスタート機能を出力制御
用誤差増幅器の位相補償回路の時定数と共用することが
できるためビン数を減らすことができ、かつ外付部品を
削減することができるため小型で安価となる。(3) When integrated into an IC, the soft start function can be shared with the time constant of the phase compensation circuit of the output control error amplifier, reducing the number of bins and reducing the number of external components. Small and inexpensive.
（４〉 高圧電源に釦いて一旦アーク放電が起こると
、アーク放電時の電圧が低いため、定電流電源の場合で
もアークが連続アークになるが、本発明の場合にはアー
ク放電が一発でも起これば、出力電圧は一旦ＯＶになり
、アークを停−止させてから再びソフトスタートにより
電圧が上昇するのでアークは連続しなくなり、アークの
エネルギーを大幅に小さくできるので、電子写真装置内
における紙の発火による火災防止に著しい効果がある。(4) Once the button is pressed on the high-voltage power supply and an arc discharge occurs, the voltage at the time of arc discharge is low, so even in the case of a constant current power supply, the arc becomes a continuous arc, but in the case of the present invention, even a single arc discharge occurs. If this occurs, the output voltage will become OV once, the arc will be stopped, and then the voltage will rise again due to soft start, so the arc will no longer be continuous and the energy of the arc can be significantly reduced, so it can be used in electrophotographic equipment. It is extremely effective in preventing fires caused by paper ignition.
第１図は本発明の第１の構成の電源回路の保護装置の一
実施例を示す回路図、第２図は第１図に示す回路図の動
作を説明する波形図、第３図、第６図、第９図は第１図
に示す一実施例の応用例を示す回路図、第４図、第６図
は第３図に示す実施例の動作を説明する波形図、第７図
は本発明の第２の構成の電源回路の保護装置の一実施例
を示す回路図、第８図は第７図に示す回路図の動作を説
明する波形図、第１０図は従来の電源回路の保護装置の
一例を示す回路図、第１１図は第１０図に示す回路図の
動作を説明する波形図である。
１・・・・・・出力制御用誤差増幅器、２・・・・・・
基準電源、３・・・・・・位相補償回路、４’ａ・・・
・・・保護用誤差増幅器、４ｂ・・・・・・保護用コン
パレータ、６・・・・・・位相補償回路、８・・・・・
・静止型変換器、９・・・・・・出力検出回路、１０・
・・・・・出力検出信号、１１・・・・・・出力異常検
出信号、１２ ・・・・スイノチ素子、１４・・・・・
・ダイオード、１３・・・・・・スイソチ素子、１６・
・・・・・直流固定電位、１６・・・・・抵抗。FIG. 1 is a circuit diagram showing an embodiment of the power supply circuit protection device of the first configuration of the present invention, FIG. 2 is a waveform diagram explaining the operation of the circuit diagram shown in FIG. 1, and FIGS. 6 and 9 are circuit diagrams showing an application example of the embodiment shown in FIG. 1, FIGS. 4 and 6 are waveform diagrams explaining the operation of the embodiment shown in FIG. 3, and FIG. A circuit diagram showing an embodiment of the power supply circuit protection device of the second configuration of the present invention, FIG. 8 is a waveform diagram explaining the operation of the circuit diagram shown in FIG. 7, and FIG. 10 is a circuit diagram of a conventional power supply circuit. FIG. 11 is a circuit diagram showing an example of the protection device. FIG. 11 is a waveform diagram illustrating the operation of the circuit diagram shown in FIG. 1...Output control error amplifier, 2...
Reference power supply, 3... Phase compensation circuit, 4'a...
...Protection error amplifier, 4b...Protection comparator, 6...Phase compensation circuit, 8...
・Static converter, 9... Output detection circuit, 10.
... Output detection signal, 11 ... Output abnormality detection signal, 12 ... Suinochi element, 14 ...
・Diode, 13... Swiss element, 16.
...DC fixed potential, 16...Resistance.
Claims (2)
の静止型変換器の出力側に出力検出回路を設け、この出
力検出回路の出力検出信号と基準電圧との差を上記誤差
増幅器により増幅するとともに、出力異常検出回路の信
号によって動作する第１のスイッチ素子を上記誤差増幅
器の出力側に上記第１のスイッチ素子がオンしたとき、
出力が停止するように接続し、上記誤差増幅器に誤差増
幅器の出力を入力側に帰還させる位相補償回路を設け、
直流固定電位と上記位相補償回路と上記第１のスイッチ
素子に直列に第２のスイッチ素子を接続してなる電源回
路の保護装置。(1) A static converter controlled by an error amplifier, and an output detection circuit provided on the output side of the static converter, and the difference between the output detection signal of the output detection circuit and the reference voltage is amplified by the error amplifier. At the same time, when the first switch element operated by the signal of the output abnormality detection circuit is turned on to the output side of the error amplifier,
The error amplifier is connected so that the output is stopped, and the error amplifier is provided with a phase compensation circuit that feeds back the output of the error amplifier to the input side.
A protection device for a power supply circuit comprising a DC fixed potential, the phase compensation circuit, and a second switch element connected in series to the first switch element.
（１）記載の電源回路の保護装置。(2) The power supply circuit protection device according to claim (1), wherein a rectifier is used as the second switch element.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1174749A JP3035922B2 (en) | 1989-07-06 | 1989-07-06 | Power circuit protection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1174749A JP3035922B2 (en) | 1989-07-06 | 1989-07-06 | Power circuit protection device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0340719A true JPH0340719A (en) | 1991-02-21 |
| JP3035922B2 JP3035922B2 (en) | 2000-04-24 |
Family
ID=15984012
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1174749A Expired - Fee Related JP3035922B2 (en) | 1989-07-06 | 1989-07-06 | Power circuit protection device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3035922B2 (en) |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1293927C (en) * | 1999-10-28 | 2007-01-10 | 美津浓株式会社 | Metallic wood club head |
| JP2007228649A (en) * | 2006-02-21 | 2007-09-06 | Fuji Electric Device Technology Co Ltd | Dc-dc converter |
| JP2008236915A (en) * | 2007-03-20 | 2008-10-02 | Fuji Electric Device Technology Co Ltd | Starting circuit of error amplifier and dc-dc converter having circuit |
| JP2009153278A (en) * | 2007-12-19 | 2009-07-09 | Sharp Corp | Switching power circuit |
| JP2011250627A (en) * | 2010-05-28 | 2011-12-08 | Rohm Co Ltd | Switching regulator |
| JP2012105453A (en) * | 2010-11-10 | 2012-05-31 | Fujitsu Semiconductor Ltd | Control circuit, electronic apparatus, and method for controlling power supply |
| JP2014166135A (en) * | 2013-02-22 | 2014-09-08 | Freescale Semiconductor Inc | Transition control for hybrid switched-mode power supply (smps) |
| JP2015006109A (en) * | 2013-06-24 | 2015-01-08 | サンケン電気株式会社 | Led driver and led lighting device, and error amplification circuit |
| US9013097B2 (en) | 2013-07-19 | 2015-04-21 | Panasonic Intellectual Property Management Co., Ltd. | Light-emitting module, lighting device, and lighting fixture |
| CN107229301A (en) * | 2016-03-23 | 2017-10-03 | 精工半导体有限公司 | Voltage regulator |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106886273A (en) * | 2017-02-24 | 2017-06-23 | 济南浪潮高新科技投资发展有限公司 | A kind of power-down protection circuit |
-
1989
- 1989-07-06 JP JP1174749A patent/JP3035922B2/en not_active Expired - Fee Related
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1293927C (en) * | 1999-10-28 | 2007-01-10 | 美津浓株式会社 | Metallic wood club head |
| JP2007228649A (en) * | 2006-02-21 | 2007-09-06 | Fuji Electric Device Technology Co Ltd | Dc-dc converter |
| JP2008236915A (en) * | 2007-03-20 | 2008-10-02 | Fuji Electric Device Technology Co Ltd | Starting circuit of error amplifier and dc-dc converter having circuit |
| JP2009153278A (en) * | 2007-12-19 | 2009-07-09 | Sharp Corp | Switching power circuit |
| JP2011250627A (en) * | 2010-05-28 | 2011-12-08 | Rohm Co Ltd | Switching regulator |
| JP2012105453A (en) * | 2010-11-10 | 2012-05-31 | Fujitsu Semiconductor Ltd | Control circuit, electronic apparatus, and method for controlling power supply |
| JP2014166135A (en) * | 2013-02-22 | 2014-09-08 | Freescale Semiconductor Inc | Transition control for hybrid switched-mode power supply (smps) |
| JP2015006109A (en) * | 2013-06-24 | 2015-01-08 | サンケン電気株式会社 | Led driver and led lighting device, and error amplification circuit |
| US9013097B2 (en) | 2013-07-19 | 2015-04-21 | Panasonic Intellectual Property Management Co., Ltd. | Light-emitting module, lighting device, and lighting fixture |
| CN107229301A (en) * | 2016-03-23 | 2017-10-03 | 精工半导体有限公司 | Voltage regulator |
| TWI701539B (en) * | 2016-03-23 | 2020-08-11 | 日商艾普凌科有限公司 | Voltage Regulator |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3035922B2 (en) | 2000-04-24 |
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