JPH033868U - - Google Patents
Info
- Publication number
- JPH033868U JPH033868U JP6455989U JP6455989U JPH033868U JP H033868 U JPH033868 U JP H033868U JP 6455989 U JP6455989 U JP 6455989U JP 6455989 U JP6455989 U JP 6455989U JP H033868 U JPH033868 U JP H033868U
- Authority
- JP
- Japan
- Prior art keywords
- voltage
- telephone
- memory
- resistor
- power supply
- 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
Landscapes
- Devices For Supply Of Signal Current (AREA)
Description
図示した回路は、本考案の電源回路の一実施例
である。
主な図番の説明、４……ダイオードブリツジ回
路、５……電池、７……制御回路、８……第１抵
抗、１０……電源供給回路、１３……電圧検出回
路、２０……電源供給用トランジスター、２１…
…第２抵抗、２３……制御トランジスター。
The illustrated circuit is one embodiment of the power supply circuit of the present invention. Explanation of main drawing numbers, 4... Diode bridge circuit, 5... Battery, 7... Control circuit, 8... First resistor, 10 ... Power supply circuit, 13... Voltage detection circuit, 20... Power supply transistor, 21...
...Second resistor, 23...Control transistor.
Claims (1)
電話番号が保持されるメモリーを備えた電話機に
おいて、電話回線より得られる電圧を第１抵抗を
通して前記メモリーに供給する電源供給回路と、
電話機に組込まれているとともに前記電源供給回
路より供給される電圧が不足するとき前記メモリ
ーに電圧を供給する電池と、電話回線の電圧低下
を検出するとともに電圧低下を検出したとき切換
信号を出力する電圧検出回路と、該電圧検出回路
より切換信号が出力されると導通状態に反転する
とともに電話回線より得られる電圧を前記第１抵
抗より小さい抵抗値を有する第２抵抗を通して前
記メモリーに供給する電源供給用トランジスター
とより成る電話機の電源回路。 A power supply circuit that supplies voltage obtained from a telephone line to the memory through a first resistor in a telephone equipped with a memory that retains a stored telephone number by being constantly supplied with power;
A battery that is built into the telephone and supplies voltage to the memory when the voltage supplied from the power supply circuit is insufficient, and a battery that detects a voltage drop in the telephone line and outputs a switching signal when a voltage drop is detected. a voltage detection circuit; and a power source that is inverted to a conductive state when a switching signal is output from the voltage detection circuit and supplies the voltage obtained from the telephone line to the memory through a second resistor having a resistance value smaller than the first resistor. A telephone power supply circuit consisting of a supply transistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6455989U JPH0638526Y2 (en) | 1989-06-01 | 1989-06-01 | Telephone power circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6455989U JPH0638526Y2 (en) | 1989-06-01 | 1989-06-01 | Telephone power circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH033868U true JPH033868U (en) | 1991-01-16 |
| JPH0638526Y2 JPH0638526Y2 (en) | 1994-10-05 |
Family
ID=31595614
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6455989U Expired - Lifetime JPH0638526Y2 (en) | 1989-06-01 | 1989-06-01 | Telephone power circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0638526Y2 (en) |
-
1989
- 1989-06-01 JP JP6455989U patent/JPH0638526Y2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0638526Y2 (en) | 1994-10-05 |