KR970064085A - Overvoltage protection circuit in answering machine - Google Patents

Overvoltage protection circuit in answering machine Download PDF

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Publication number
KR970064085A
KR970064085A KR1019960004143A KR19960004143A KR970064085A KR 970064085 A KR970064085 A KR 970064085A KR 1019960004143 A KR1019960004143 A KR 1019960004143A KR 19960004143 A KR19960004143 A KR 19960004143A KR 970064085 A KR970064085 A KR 970064085A
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KR
South Korea
Prior art keywords
voltage
supplied
adapter
transistor
control signal
Prior art date
Application number
KR1019960004143A
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Korean (ko)
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KR0167897B1 (en
Inventor
류영무
Original Assignee
김광호
삼성전자 주식회사
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Priority to KR1019960004143A priority Critical patent/KR0167897B1/en
Publication of KR970064085A publication Critical patent/KR970064085A/en
Application granted granted Critical
Publication of KR0167897B1 publication Critical patent/KR0167897B1/en

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/64—Automatic arrangements for answering calls; Automatic arrangements for recording messages for absent subscribers; Arrangements for recording conversations
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M19/00—Current supply arrangements for telephone systems
    • H04M19/08—Current supply arrangements for telephone systems with current supply sources at the substations

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Protection Of Static Devices (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

1. 청구범위에 기재된 발명이 속한 기술분야1. Technical field to which the invention described in the claims belongs

자동응답기에서 과전압이 회로에 공급되는 것을 방지하기 위한 보호회로.Protection circuit to prevent overvoltages from being supplied to the circuit in the answering machine.

2. 발명이 해결하려고 하는 기술적 과제2. Technical Challenges to be Solved by the Invention

충전베터리를 충전하기 위해서는 일반적으로 동작전압 이상의 전압이 어뎁터로부터 공급되어져야 한다. 통상저긍로 충전베터리에 충전되는 전압은 4.3V에서 5.5V이므로 충전베터리로 공급되는 전압은 9V 또는 어뎁터의 2차측 전압은 약 12V가 인가된다. 충전베터리를 사용하여 전압을 공급하는 경우에 상기 충전베터리가 파손되거나, 상기 충전베터리가 장착되지 않은 경우에는 자동응답기 회로를 구성하는 CPU, 메모리등의 정격전압인 5.5볼트(V) 이상의 과전압이 어뎁터로부터 공급되므로 인하여 제품 전체를 파손하는 문제점이 있었다.In order to charge the rechargeable battery, a voltage higher than the operating voltage must be supplied from the adapter. Normally, the charging voltage of the rechargeable battery is 4.3V to 5.5V, so the voltage supplied to the rechargeable battery is 9V or the secondary voltage of the adapter is about 12V. When the charging battery is broken or the charging battery is not mounted when a voltage is supplied using the rechargeable battery, an overvoltage of 5.5 volts or more, which is the rated voltage of the CPU, memory, etc. constituting the answering machine circuit, Thereby damaging the entire product.

3. 발명의 해결방법의 요지3. The point of the solution of the invention

어뎁터로부터 공급되는 전압을 충전하는 충전베터리를 구비한 자동응답전화기에서, 상기 어뎁터로부터 전압의 공급 여부에 따른 스위치제어신호를 출력하는 스위치제어부와, 상기 충전베터리를 상기 스위치제어부의 제어신호에 따라 자동응답전화기 회로로 연결하는 스위치로 구성되어 과전압으로 부터 회로의 파손을 방지하는 과전압 보호회로,A switch control section for outputting a switch control signal according to whether or not a voltage is supplied from the adapter in an automatic answering telephone provided with a rechargeable battery for charging a voltage supplied from an adapter; An overvoltage protection circuit which is composed of a switch connected to the telephone circuit of answering machine and prevents breakage of the circuit from overvoltage,

4. 발명의 중요한 용도4. Important Uses of the Invention

충전베터리를 가지는 전자제품.An electronic product having a rechargeable battery.

Description

자동응답기에서 과전압 보호회로Overvoltage protection circuit in answering machine

본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음Since this is a trivial issue, I did not include the contents of the text.

제1도는 본 발명에 따른 자동응답기에서 전원부를 블럭 구성도.FIG. 1 is a block diagram of a power supply unit in an answering machine according to the present invention; FIG.

제2도는 본 발명에 따른 전원부의 상세 회로도.FIG. 2 is a detailed circuit diagram of a power supply unit according to the present invention. FIG.

Claims (6)

어뎁터로부터 공급되는 전압을 충전하는 충전베터리를 구비한 자동응답전화기에 있어서, 상기 어뎁터로부터 전압의 공급 여부에 따른 스위치제어신호를 출력하는 스위칭제어부와 상기 충전베터리를 상기 스위치제어부의 제어신호에 따라 자동응답전화기 회로로 연결하는 스위치로 구성됨을 특징으로 하는 과전압 보호회로.The automatic answering telephone provided with a rechargeable battery for charging a voltage supplied from an adapter, comprising: a switching controller for outputting a switch control signal according to whether or not a voltage is supplied from the adapter; And a switch connected to the answering telephone circuit. 제1항에 있어서, 상기 스위치제어부는, 상기 어뎁터로부터 전압이 공급되는 경우에는 스위치를 오프시키기 위한 로우레벨의 제어신호를 출력하며, 상기 어뎁터로부터 전압이 공급되지 않는 경우에는 스위치를 은시키기 위한 하이레벨의 제어신호를 출력함을 특징으로 하는 과전압 보호회로.The apparatus according to claim 1, wherein the switch control unit outputs a low level control signal for turning off the switch when a voltage is supplied from the adapter, and outputs a low level control signal for turning off the switch when the voltage is not supplied from the adapter Level control signal to the overvoltage protection circuit. 어뎁터로부터 공급되는 전압을 충전하는 충전베테리를 구비한 자동응답전화기에 있어서, 상기 어뎁터로부터 공급되는 전압을 분압하여 분압되는 전압에 따라 바이어스되어 제어신호를 출력하는 제어부와, 상기 제어부로부터 출력되는 제어신호에 따라 바이어스되어 스위칭 동작을 하는 스위치로 구성됨을 특징으로 하는 과전압 보호회로.An automatic answering telephone having a charging battery for charging a voltage supplied from an adapter, the automatic answering telephone comprising: a control unit for outputting a control signal biased according to a voltage divided by dividing a voltage supplied from the adapter; And a switch biased according to a signal to perform a switching operation. 제3항에 있어서, 상기 제어부는, 상기 어뎁터로부터 공급되는 전압을 분압하는 두개의 저항과, 상기 저항에 분압된 전압이 바이어스 전압으로 연결되어 제어신호를 콜랙터를 통해 출력하는 제1트랜지스터로 구성됨을 특징으로 하는 과전압 보호회로.4. The apparatus of claim 3, wherein the controller comprises two resistors for dividing a voltage supplied from the adapter, and a first transistor connected to the resistor by a bias voltage to output a control signal through a collector Voltage protection circuit. 제4항에 있어서, 상기 스위치는, 상기 제어부에 구비된 제1트랜지스터의 콜랙터로부터 출력되는 제어신호를 바이어스 전압으로 입력받아 스위칭 동작하는 제2트랜지스터와, 상기 충전베터리에 에미터가 자동응답전화기 회로에 콜랙터가 접속되고 상기 제2트랜지스터의 콜랙터에 베이스가 연결되어 상기 제2트랜지스터의 동작에 따라 상기 충전베터리와 자동응답전화기 회로를 연결하는 제3트랜지스터로 구성됨을 특징으로 과전압 보호회로.The apparatus of claim 4, wherein the switch comprises: a second transistor receiving a control signal output from a collector of the first transistor provided in the control unit as a bias voltage; And a third transistor connected to a collector of the second transistor and a base connected to the collector of the second transistor to connect the charging battery and the answering telephone circuit according to the operation of the second transistor. 제5항에 있어서, 상기 제3트랜지스터는 pnp형 트랜지스터를 사용함을 특징으로 하는 과전압 보호회로.The overvoltage protection circuit according to claim 5, wherein the third transistor uses a pnp-type transistor. ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임※ Note: It is disclosed by the contents of the first application.
KR1019960004143A 1996-02-22 1996-02-22 Automatic answering telephone voltage protection circuit KR0167897B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1019960004143A KR0167897B1 (en) 1996-02-22 1996-02-22 Automatic answering telephone voltage protection circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1019960004143A KR0167897B1 (en) 1996-02-22 1996-02-22 Automatic answering telephone voltage protection circuit

Publications (2)

Publication Number Publication Date
KR970064085A true KR970064085A (en) 1997-09-12
KR0167897B1 KR0167897B1 (en) 1999-02-01

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Family Applications (1)

Application Number Title Priority Date Filing Date
KR1019960004143A KR0167897B1 (en) 1996-02-22 1996-02-22 Automatic answering telephone voltage protection circuit

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Publication number Publication date
KR0167897B1 (en) 1999-02-01

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