JPS5848123A - Protecting circuit - Google Patents
Protecting circuitInfo
- Publication number
- JPS5848123A JPS5848123A JP14638281A JP14638281A JPS5848123A JP S5848123 A JPS5848123 A JP S5848123A JP 14638281 A JP14638281 A JP 14638281A JP 14638281 A JP14638281 A JP 14638281A JP S5848123 A JPS5848123 A JP S5848123A
- Authority
- JP
- Japan
- Prior art keywords
- oscillator
- load
- voltage
- circuit
- transformer
- 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.)
- Pending
Links
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
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Protection Of Static Devices (AREA)
- Continuous-Control Power Sources That Use Transistors (AREA)
Abstract
Description
【発明の詳細な説明】
本発明は、映像を表示するためのブラウン管を備えた機
器の保護回路に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a protection circuit for equipment equipped with a cathode ray tube for displaying images.
テレビジョン受像０機等のブラウン管を備えた機器にお
いては、ブラウン管に高電圧を印加するための高圧回路
でその構成部品が開放または短絡した場合、フライバッ
クトランスの二次側に異常な高電圧が発生する。このよ
うな高圧回路の故障等により異常な高電圧が発生した場
合、ブラウン管から放射線が出ることがあるために、使
用者は極めて危険な状態に陥る。In equipment equipped with a cathode ray tube, such as television receivers, if a component in the high voltage circuit for applying high voltage to the cathode ray tube is open or shorted, an abnormal high voltage may be applied to the secondary side of the flyback transformer. Occur. If abnormal high voltage is generated due to a failure of such a high voltage circuit, radiation may be emitted from the cathode ray tube, putting the user in an extremely dangerous situation.
本発明は、最近機器の電源として広く用いられているス
イッチング電源の保護回路を利用して、異常な高電圧が
発生した場合または負荷が短絡した場合に負荷への軍ガ
の供給を速やかに停止するよ−うにすることによって、
簡単な構成で機器の安全性を保つことができる保護回路
を提供するものである。以下、図面により本発明の実施
例を詳細に説明する。The present invention utilizes the protection circuit of a switching power supply, which has recently been widely used as a power source for equipment, to immediately stop the supply of power to the load when abnormally high voltage occurs or when the load is short-circuited. By doing so,
The present invention provides a protection circuit that can maintain the safety of equipment with a simple configuration. Embodiments of the present invention will be described in detail below with reference to the drawings.
図は本発明の一実施例の構成を示したも′のである。変
圧器１、スイッチングトランジスタ２および発振器３は
スイッチング電源を構成しており、発振器３の発振に従
って、変圧器１の一次側に直列接続されたスイッチング
トランジスタ２が導通・非導通を繰返すことによって、
変圧器１の二次側に接続された負荷４に電力を供給して
いる。ここで、発振器３の発振周波数はブラウン管の水
平操作に用いられる水平同期信号の周波数と同じであり
、その発振を安定させるために、同期入力端子Ｂには、
負荷４内のフライバックトランスの二次側から出力され
る水平成分を分圧器で分圧した信号が供給されている。The figure shows the configuration of one embodiment of the present invention. The transformer 1, the switching transistor 2, and the oscillator 3 constitute a switching power supply, and the switching transistor 2 connected in series to the primary side of the transformer 1 repeats conduction and non-conduction according to the oscillation of the oscillator 3.
Power is supplied to a load 4 connected to the secondary side of the transformer 1. Here, the oscillation frequency of the oscillator 3 is the same as the frequency of the horizontal synchronization signal used for horizontal operation of the cathode ray tube, and in order to stabilize the oscillation, the synchronization input terminal B is connected to the
A signal obtained by dividing the horizontal component output from the secondary side of the flyback transformer in the load 4 using a voltage divider is supplied.
ダイオード５，６およびコンデンサ７は、抵抗器８の上
端の電圧および同期入力端子Ｂに入力する信号の電圧の
最大値を検出するピーク検波回路を構成しており、その
出力は、発振器３の制御端子Ａに入力している。そして
、発振器３は、制御端子Ａの電圧があらかじめ定められ
た値になるとその発振が停止する０以上のように構成さ
れた本実施例においては。The diodes 5 and 6 and the capacitor 7 constitute a peak detection circuit that detects the voltage at the upper end of the resistor 8 and the maximum value of the voltage of the signal input to the synchronous input terminal B, and its output is used to control the oscillator 3. Input to terminal A. In this embodiment, the oscillator 3 is configured such that the oscillator 3 stops oscillating when the voltage at the control terminal A reaches a predetermined value.
負荷４内の高圧回路の故障等によりフライバックトラン
スの二次側に異常な高電圧が発生すると、同期入力端子
Ｂに入力する信号の電圧が通常時よコンデンサ７によっ
て制御端子Ａに印加されるため、発振器３はその発振を
停止し、負荷４への電力の供給は速やかに停止される。When an abnormal high voltage is generated on the secondary side of the flyback transformer due to a failure of the high voltage circuit in the load 4, the voltage of the signal input to the synchronous input terminal B is applied to the control terminal A by the capacitor 7 as usual. Therefore, the oscillator 3 stops its oscillation, and the supply of power to the load 4 is immediately stopped.
また、負荷４内で短絡事故等が発生しスイッチングトラ
ンジスタ２に過大電流が流れる・と、抵抗器８の上端の
電圧が通常時よりも高くなるために、発振器３は発振を
停止して、スイッチングトランジスタ２が破壊されるこ
とを防止する。In addition, if a short circuit occurs in the load 4 and excessive current flows through the switching transistor 2, the voltage at the top of the resistor 8 will become higher than normal, and the oscillator 3 will stop oscillating and switch. This prevents transistor 2 from being destroyed.
以上説明したように本発明によれば、フライバックトラ
ンスの二次側に異常な高電圧が発生した場合または負荷
が短絡した場合に、負荷への電力の供給を速やかに停止
することができ、機器の安全性を高水準に維持すること
ができるという利点がある。As explained above, according to the present invention, when abnormal high voltage occurs on the secondary side of the flyback transformer or when the load is short-circuited, the supply of power to the load can be immediately stopped. This has the advantage that equipment safety can be maintained at a high level.
図は本発明の一実施例の構成を示すものである。
ｌ・・・・・・・・・変圧器、 ２・・・・・・・・・
スイッチングトランジスタ、 ３・・・・・・・・・発
振器、 ４ ・・・・・・・・・負荷、５．６ ・・・
・・・・・・ダイオード、 ７・・・・・・・・・コン
デンサ、８・・・・・・・・・抵抗器、 Ａ曲・・・・
・制御端子、Ｂ・・・・・・・・・同期入力端子。
特許出願人松下電器産業株式会社The figure shows the configuration of an embodiment of the present invention. l......Transformer, 2......
Switching transistor, 3...Oscillator, 4...Load, 5.6...
...Diode, 7...Capacitor, 8...Resistor, Song A...
・Control terminal, B......Synchronization input terminal. Patent applicant Matsushita Electric Industrial Co., Ltd.
Claims (1)
トランジスタと、このスイッチングトランジスタの出力
回路に一次側が接続された変圧器とからなるスイッチン
グ電源回路の前記変圧器の二次側に負荷が接続され、負
荷の周波数に同期して発振するよう負荷分圧が前記発振
器に入力される回路において、前記発振器に他の入力端
子を設けてこの入力端子の入力電圧が成る一定電圧以上
になったときに前記発振器の発振が停止するようにし、
前記スイッチングトランジスタの出力の過大電流を検出
する回路と前記負荷回路の過大電圧を検出する回路とを
設け、前記雨検出回路の各出力電圧を前記発振器の前記
他の入力端子に印加するようにしたことを特徴とする保
護回路。A load is connected to the secondary side of the transformer of a switching power supply circuit consisting of an oscillator, a switching transistor driven by the output of the oscillator, and a transformer whose primary side is connected to the output circuit of the switching transistor. In a circuit in which a load divided voltage is input to the oscillator so as to oscillate in synchronization with the frequency of so that the oscillation of
A circuit for detecting excessive current in the output of the switching transistor and a circuit for detecting excessive voltage in the load circuit are provided, and each output voltage of the rain detection circuit is applied to the other input terminal of the oscillator. A protection circuit characterized by:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14638281A JPS5848123A (en) | 1981-09-18 | 1981-09-18 | Protecting circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14638281A JPS5848123A (en) | 1981-09-18 | 1981-09-18 | Protecting circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5848123A true JPS5848123A (en) | 1983-03-22 |
Family
ID=15406435
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14638281A Pending JPS5848123A (en) | 1981-09-18 | 1981-09-18 | Protecting circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5848123A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63278564A (en) * | 1987-03-04 | 1988-11-16 | ファインベルクテクニク・シュライヒヤ・ウント・コンパニ | Cutting mechanism |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS52114913A (en) * | 1976-03-22 | 1977-09-27 | Toko Inc | Intermittent control power converter |
-
1981
- 1981-09-18 JP JP14638281A patent/JPS5848123A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS52114913A (en) * | 1976-03-22 | 1977-09-27 | Toko Inc | Intermittent control power converter |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63278564A (en) * | 1987-03-04 | 1988-11-16 | ファインベルクテクニク・シュライヒヤ・ウント・コンパニ | Cutting mechanism |
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