KR970056533A - DC / DC voltage converter of digital key phone - Google Patents
DC / DC voltage converter of digital key phone Download PDFInfo
- Publication number
- KR970056533A KR970056533A KR1019950048145A KR19950048145A KR970056533A KR 970056533 A KR970056533 A KR 970056533A KR 1019950048145 A KR1019950048145 A KR 1019950048145A KR 19950048145 A KR19950048145 A KR 19950048145A KR 970056533 A KR970056533 A KR 970056533A
- Authority
- KR
- South Korea
- Prior art keywords
- voltage
- input
- key phone
- digital key
- negative
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M19/00—Current supply arrangements for telephone systems
- H04M19/001—Current supply source at the exchanger providing current to substations
- H04M19/008—Using DC/DC converters
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Dc-Dc Converters (AREA)
- Telephone Function (AREA)
Abstract
본 발명은 주장치로부터 싱글 페어라인을 통하여 입력되는 -24V 직류 전압으로부터 디지털 키폰에서 필요로하는 직류 전압을 안정적으로 발생시키기 위한 디지털 키폰의 직류/직류 전압 변환 장치에 관한 것으로, 키폰 시스템의 주장치로부터 공급받는 -24V 직류 전압이 디지털 키폰 내에 입력될 때 극성에 관계없이 입력될 수 있도록 하는 극성 보호 수단(2); 과전압 및 과전류의 입력에 따른 내부회로의 파괴를 방지하는 과전압/과전류 차단 수단(D8,R18); 및 자체 프리 러닝 주파수를 가지고 상기 극성 보호 수단을 통한 신호의 펄스폭을 변조하여 디지털 키폰에서 필요로 하는 포지티브 직류 전압을 출력하는 펄스 폭 변조 제어 수단(3)을 구비하는 것을 특징으로 하며, 디지털 키폰에서 필요로하는 전원을 정확하고 안정적으로 공급할 수 있는 효과를 가진다.The present invention relates to a DC / DC voltage converter of a digital key phone for stably generating a DC voltage required by a digital key phone from a -24V DC voltage input through a single pair line from a main device. Polarity protection means (2) to allow a received -24V DC voltage to be input regardless of the polarity when it is input into the digital keyphone; Overvoltage / overcurrent blocking means (D8, R18) for preventing destruction of an internal circuit due to input of overvoltage and overcurrent; And pulse width modulation control means (3) for modulating the pulse width of the signal through the polarity protection means with its own free running frequency and outputting the positive DC voltage required by the digital key phone. It has the effect of supplying precisely and stably the power required by.
Description
본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음Since this is an open matter, no full text was included.
제1도는 본 발명의 1실시예에 따른 디지털 키폰의 직류/직류 전압 변환 장치의 블록 구성도.1 is a block diagram of a DC / DC voltage converter of a digital key phone according to an embodiment of the present invention.
제2도는 디지털 키폰의 직류/직류 전압 변환 장치를 실제 구현한 회로도.2 is a circuit diagram of the actual implementation of the DC / DC voltage conversion device of the digital key phone.
* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings
1 : 라인 모듈라 잭 2 : 극성 보호 회로1: line modular jack 2: polarity protection circuit
3 : 펄스 폭 변조 제어 회로 4 : 인덕터3: pulse width modulation control circuit 4: inductor
5 : 네가티브 전압 레귤레이터5: negative voltage regulator
Claims (3)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1019950048145A KR0158302B1 (en) | 1995-12-09 | 1995-12-09 | Dc vs dc voltage converting apparatus in a digital keyphone |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1019950048145A KR0158302B1 (en) | 1995-12-09 | 1995-12-09 | Dc vs dc voltage converting apparatus in a digital keyphone |
Publications (2)
Publication Number | Publication Date |
---|---|
KR970056533A true KR970056533A (en) | 1997-07-31 |
KR0158302B1 KR0158302B1 (en) | 1998-12-01 |
Family
ID=19438893
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
KR1019950048145A KR0158302B1 (en) | 1995-12-09 | 1995-12-09 | Dc vs dc voltage converting apparatus in a digital keyphone |
Country Status (1)
Country | Link |
---|---|
KR (1) | KR0158302B1 (en) |
-
1995
- 1995-12-09 KR KR1019950048145A patent/KR0158302B1/en not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
KR0158302B1 (en) | 1998-12-01 |
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Legal Events
Date | Code | Title | Description |
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A201 | Request for examination | ||
E701 | Decision to grant or registration of patent right | ||
GRNT | Written decision to grant | ||
LAPS | Lapse due to unpaid annual fee |