CN2671251Y

CN2671251Y - Public telephone charger for acquiring power supply from telephone line

Info

Publication number: CN2671251Y
Application number: CN 200320122319
Authority: CN
Inventors: 陈国全; 陈木全
Original assignee: SHANGHAI ZHENGQIAN INFORMATION TECHNOLOGY DEVELOPMENT Co Ltd
Current assignee: SHANGHAI ZHENGQIAN INFORMATION TECHNOLOGY DEVELOPMENT Co Ltd
Priority date: 2003-12-11
Filing date: 2003-12-11
Publication date: 2005-01-12
Anticipated expiration: 2013-12-11

Abstract

The utility model relates to a public telephone charger, particularly a public telephone charger without an external power supply. The utility model solves the defect that the commonly used public telephone charger in the existing market all needs an independent external power supply to supply power. The utility model has the technical proposal scheme that the public telephone charger without an external power supply is characterized in that a mainboard of the public telephone charger comprises a CPU, a clock circuit, a storage, a power supply circuit, a buzzer circuit and a receiving circuit; the CPU is respectively connected with input keys, an LED displaying circuit, a storage circuit, the clock circuit, the buzzer circuit and the power supply circuit; the clock circuit is connected with a back-up cell; the power supply circuit is connected with a telephone line; the receiving circuit is connected with the telephone line and is connected with the CPU through four data lines. The public telephone charger without an external power supply is mainly used for the charging of public telephones.

Description

A kind of public telephone taximeter that directly obtains power supply from telephone wire

Technical field: the utility model relates to a kind of public telephone taximeter, particularly a kind of public telephone taximeter that does not need external power supply.

Background technology: at present, the public telephone taximeter that generally uses on the market all needs independently external power supply power supply.In use, if the situation that power failure or internal transformer damage etc. can't be used external power supply takes place, taximeter promptly can't be worked, and makes troubles to the user, brings the certain economic loss to user and operator simultaneously.

The utility model content: the utility model technical issues that need to address are: for solve the public telephone taximeter work process in to the dependence of external power supply and user's personal safety problem, a kind of taximeter of more convenient use is provided to the user when reducing cost.

For realizing above-mentioned purpose, the technical solution of the utility model is: the mainboard of public telephone taximeter is by CPU, clock circuit, memory, power circuit, buzzer circuit and receiving circuit are formed, CPU connects enter key respectively, the LED display circuit, memory circuitry, clock circuit, buzzer circuit and power circuit, be responsible for handling and controlling all operations of each circuit part, clock circuit is connected with backup battery, its power supply is provided by backup battery, backup battery is a rechargeable battery, 5V power supply on the disconnected telephone wire of hook state incision, have only backup battery to power to clock circuit, the assurance clock is not lost, during off-hook, power circuit is connected the power supply that will be directly obtains 5V from telephone wire powers to taximeter with telephone wire, charges to backup battery simultaneously.Receiving circuit is connected with telephone wire and links to each other with CPU by four data wires, and the telephone number of the dual-tone multifrequency that will receive from telephone wire offers cpu, judges the classification of received number by cpu, thereby charges.

The beneficial effects of the utility model are, this public telephone taximeter does not have external power supply plug and transformer, does not need to connect external power supply, and off-hook is promptly started working, and has reduced the trouble of wiring, also can work during mains failure.Utilize anti-polar signal to begin to charge after the connection, lock current ticket during on-hook and send prompt tone, only press reset key and just get back to standby interface, and show disappearance, enter energy-saving mode in one minute (this time is adjustable) back.Reduced production cost and use cost,, also provide a kind of more convenient, safer using method simultaneously for the user for the manufacturer provides the more economic mode of production.

Description of drawings:

Fig. 1 is the utility model syndeton block diagram

Fig. 2 is receiving circuit figure of the present utility model

Fig. 3 is the utility model buzzer circuit figure

Fig. 4 is a clocking scheme of the present utility model

Fig. 5 is memory circuitry figure of the present utility model

Fig. 6 is a power circuit diagram of the present utility model

Fig. 7 is cpu circuit figure of the present utility model

Fig. 8 is LED display circuit figure of the present utility model

Embodiment: with reference to accompanying drawing 1-8,

This public telephone taximeter comprises CPU, LED display circuit, memory, clock circuit, power circuit, buzzer circuit and receiving circuit and peripheral components, CPU connects enter key, LED display circuit, memory circuitry, clock circuit, buzzer circuit and power circuit respectively, is responsible for handling and controlling all operations of each circuit part.Receiving circuit is connected with telephone wire and links to each other with CPU by four data wires, and the telephone number of the dual-tone multifrequency that will receive from telephone wire offers cpu, judges the classification of received number by cpu, thereby charges.Clock circuit produces clock, and it must be worked under the situation that electricity is arranged, and is powered to clock circuit by backup battery, and backup battery is a rechargeable battery.The power circuit part branch comprises the part of rectifier bridge, anti-thunder tube and voltage stabilizing.Directly obtain the power supply of 5V during off-hook by telephone wire, the rectifying bridge type circuit by it charges to backup battery simultaneously, and makes this taximeter operate as normal.Cut off the 5V power supply during on-hook, have only backup battery to power to clock circuit, the assurance clock is not lost.Selected each circuit of the utility model is custom circuit, and CPU is 89C52, and clock circuit is PCF8563T, and memory is 24LC256B, and receiving circuit is HT9170D.

The use of this taximeter is as follows: the taximeter backup battery (three joint 1.5V battery) of packing into, telephone wire is inserted the outer line interface of taximeter, the telephone interface of telephone set accounting access device, this moment, taximeter entered standby interface, show date and the time, about one minute (this time is adjustable) back disappears, and enters energy-saving mode.During off-hook, background light is bright, and sends prompt tone, screen display date and time, behind closing of the circuit, taximeter begins to charge, and the time of screen display conversation and the present charging amount of money are during end of conversation, taximeter can lock current ticket, and send prompt tone always, up to disappearing by prompt tone after the reset key, screen is got back to the date time surface.About one minute (this time is adjustable) back screen display disappears, and enters energy-saving mode.

Do not connect as phone, taximeter is got back to the concurrent prompt tone of date time surface automatically.

Do not having can to wake taximeter up by any key under the situation of off-hook, it is bright to send prompt tone rear backdrop lamp, enters into the date time surface.

Claims

1, a kind of public telephone taximeter that does not need external power supply, the mainboard that it is characterized in that the public telephone taximeter is made up of CPU, clock circuit, memory, power circuit, buzzer circuit and receiving circuit, CPU connects enter key, LED display circuit, memory circuitry, clock circuit, buzzer circuit and power circuit respectively, clock circuit is connected with backup battery, power circuit is connected with telephone wire, and receiving circuit is connected with telephone wire and links to each other with CPU by four data wires.

2, public telephone taximeter according to claim 1 is characterized in that, described power circuit is connected the power supply that will be directly obtains 5V from telephone wire powers to taximeter with telephone wire, is connected to backup battery with backup battery simultaneously and charges.