CN2369295Y - IC card controller for computer - Google Patents

Abstract

The utility model relates to an IC card controller for a computer, which is composed of a minimum unit of a monolithic computer, an IC card write-read circuit, a communication interface between the monolithic computer and a PC, a PC monitoring and control circuit, a power circuit, and a state indicating circuit. The IC card controller for a computer can realize the function that manual work can not reach; for example, a computer can be used by a card at any time, and the management carried out by a special person is not needed, if money in the card of a computer room is run out, a correct IC card is inserted into the computer again, the previous work can be continuously carried out, and data during the period can not be lost; moreover, the design of the structure is simple and reasonable, and the cost is low. The utility model can be widely suitable for various household and commercial PC of schools, enterprises, etc., the control of network workstations, and unattended computer rooms.

Description

IC card controller for computer

The utility model relates to a kind of computer hardware, relates in particular to a kind of computing machine IC controller.

Domestic management to computer room at present still rests in the labor management.For example: in school, when the student buys machine during ticket, and give the machine room teacher with ticket, teacher arranges plane No., time etc. properly, and the time arrives, and then urges machine under the student.Like this, have following shortcoming, the last tractor driver of student continues loaded down with trivial details, as to have increased teacher workload, the scattered funds of ticket inconvenience management when buying machine.Defectives such as in a word, labor management exists complex management, and workload is big.

The purpose of this utility model is: IC-card is applied to places such as school computer center, upward the tractor driver is continuous to reduce the student, reduces the workload of teaching and administrative staff's management, for this reason, develops the IC-card controller that a kind of computing machine is used.

The utility model partly is made of communication interface, PC monitoring and control circuit and power supply etc. between single-chip microcomputer minimum unit, IC-card read/write circuit, single-chip microcomputer and PC.The single-chip microcomputer minimum unit comprises CPU, oscillatory circuit and reset circuit, is carried out inner EPROM program and outside I/O mouth is controlled by CPU, and when the unit powered on, reset circuit was exported a high level and given single-chip microcomputer RESET pin, forces single-chip microcomputer to reset.The IC-card read/write circuit comprises that IC-card feed circuit and IC-card read-write interface constitute.CPU in the single-chip microcomputer minimum unit carries out inner EPROM program outside I/O mouth is controlled; Its read-write part directly connects the IC-card pin with the single-chip processor i/o mouth through the resistance current limliting and reads and writes.The effect of communication interface is to realize communicating by letter between microcontroller serial port and PC between single-chip microcomputer and PC, and PC monitoring and control circuit are experienced the PC duty, control the dormancy and the wake-up states of PC.

The utility model is for simplifying circuit, and communication interface adopts the RS232 interface between single-chip microcomputer and PC, and to adopt a level shifting circuit be the RS232 standard signal with the TTL signal transition on the single-chip microcomputer.

The utility model is operated for ease of the user, also is provided with condition indication circuit, is provided with a double-colored pilot lamp indication IC-card job and a fund state.

The utlity model has following function and characteristics, these all are that labor management is difficult to realize.

1. machine on the user can hold in any permission is without personal management's machine room.Disposablely when card is gone up insufficient funds pay, write in the card by relevant departments' fund to administrative authority;

2. allow the user to use a computer after inserting correct IC-card, this moment, controller was deducted upward the balance of funding of card on time, and fund is used up back controller system PC and entered dormant state, and up to inserting correct IC-card, the user can continue previous work, and data are not lost therebetween;

3. holder such as need break-off only need be taken out IC-card, PC dormancy this moment, and power switch, reset key, keyboard, mouse etc. all lost efficacy, and the protection user data is not changed;

4. link to each other with the PC mainboard by hardware circuit, the user can not walk around controller and use a computer:

5. adopt the SEMEN4442 encrypting IC card, more than can be erasable repeatedly going up for 100000 times, the password of publisher's definable oneself guarantees that IC-card is not duplicated by other people, and the assurance computing machine is not usurped by other people;

6. controller and block to become lower is applicable to the control and the unattended machine room of all kinds of family expenses such as school, office, commercial PC, network workstation.

Accompanying drawing: be the utility model circuit theory diagrams;

Contrasting accompanying drawing below in conjunction with embodiment is elaborated to the utility model.

Present embodiment is by single-chip microcomputer minimum unit 1, IC-card read/write circuit 2, and communication interface 3 between single-chip microcomputer and PC, PC monitoring and control circuit 4, power circuit 5 and condition indication circuit 6 formations.Single-chip microcomputer minimum unit 1 is made of CPUU1 (89C2051), oscillatory circuit and reset circuit three parts, is carried out inner EPROM program and outside I/O mouth is controlled by CPU.Oscillatory circuit is made of capacitor C 1, C2, crystal oscillation OSC, capacitor C 1, C2 one end are connected to CPU (80C2051) OSC1, OSC2 end respectively, the equal ground connection of the other end, crystal oscillator OSC cross-over connection is between CPUOSC1, OSC2 end pin, because of OSC1, OSC2 inside is input, the output terminal of a phase inverter, produce vibration so constitute a self-excited oscillator, its oscillation frequency is determined by crystal oscillator OSC.Reset circuit is connected to form by resistance R 2 and electric capacity E2, and mid point connects single-chip microcomputer RESET pin, resistance R 2 one end ground connection, electric capacity E2 one termination Vcc, because of the voltage on the capacitor can not suddenly change, wherein naming a person for a particular job produces of short duration high level, forces single-chip microcomputer to reset when system powers on.IC-card read/write circuit 2 is made of IC-card feed circuit and IC-card read-write interface, feed circuit are made of 3 not gate U5D, U5E, U5F, the P1.5 mouth of single-chip microcomputer is connected to not gate U5D, the U5F input end of 2 parallel connections in addition by one of them not gate U5F, with the output terminal of these two not gates as IC-card power supply CRAD_VCC, if IC-card powers on, only need make single-chip microcomputer P1.5 mouth is that high level gets final product.The IC-card read-write interface is connected to the IC-card pin by the single-chip processor i/o mouth and constitutes after resistance 200 current limlitings, and on the IC read/write head, be provided with the switch U6 that the perception card inserts, one end ground connection, another kind connects not gate U5A input end, not gate U5A output terminal meets single-chip processor i/o mouth P3.2, in case there is card to insert, on single-chip microcomputer P3.2 pin, can perceive a high level like this, carry out operation blocking according to this signal to low level saltus step.Single-chip microcomputer and PC communication interface have adopted the RS232 interface, are the RS232 standard signal so be provided with a level shifting circuit U3 (MAX232) with the TTL signal transition on the microcontroller serial port, to realize communicating by letter between microcontroller serial port and PCRS232 mouth.Pin P3.1, the P3.2 of the inner serial ports of single-chip microcomputer is connected to input end R1OUT and the TIN of level shifting circuit U3 respectively, changes the output of RS232 signal after its internal conversion into.PC monitoring and control circuit are by resistance R 4, R7～R9, capacitor C 4, coupling capacitance E6, diode D, triode D2, not gate U5B, U5C and switch J2～J8 constitutes, when single-chip simulation ground wire CTL is ground wire, the Power of computing machine and Reset switch are ground because of an end, so the effect that can play power switch and reset, when making it unsettled, computing machine Power and Reset switch are empty because of an end, so the effect that can not play power switch and reset, i.e. switch failure.Like this, when single-chip microcomputer perceives incorrect IC-card or do not have inserted IC card, just can forbid or allow computer switch by the CTL pin is controlled.Resistance R 7 is in parallel with coupling capacitance, one end ground connection, another termination not gate U5B output terminal, not gate U5B input end connects single-chip microcomputer P1.7 mouth, make the output terminal of not gate be in low level at powered on moment, being in low level when not having electricity, is ground thereby make the Power of computing machine and Reset switch one end, can play the power switch reset response.Resistance R 8 constitutes wire jumper input with J8, J8 one end ground connection, and another termination Vcc, when wire jumper was placed on 1-2, P1.6 is last just can to know low level, then can utilize turning to of this wire jumper determination procedure.During computing machine place dormant state, its ACPI, CED pin produce a square wave, and through resistance R 9, triode D2 is connected to single-chip microcomputer P3.7 pin after amplifying with signal, program can have no signal to judge whether computing machine enters dormant state according to the P3.7 pin, thereby the enterprising walking of program is to judgement.Power circuit 5 is by integrated regulator U4 (LM78L05), filter capacitor E1, E5, C3, C5, a C7 end ground connection in parallel, another termination U4 output terminal pin 3.Integrated regulator U4 is as the linear voltage stabilization of maximum (150MA) electric current output, but one side plays the restriction function of current to IC-card read write line internal circuit, the also unlikely entire machine work that influences even feasible on the other hand read/write circuit internal circuit is out of order.Condition indication circuit 5 is by resistance R 1, R5, R6 triode D3～D6, and the typical push-pull type amplifying circuit that two-color diode LED1, LED constitute constitutes, and two input ends connect P3.4, P3.5 mouth respectively.On P3.4 or P3.5, apply low level and will make red light or green light bright,, will make optical diode and send orange-colored light, do not have plug-in card in order to indication if apply low level at two ends simultaneously, block incorrect, no fund on the card, operate as normal is is reading or writing states such as card.

Claims (4)

1, a kind of IC card controller for computer is characterized in that: be made of communication interface (3), PC monitoring and control circuit (4), power circuit (5) between single-chip microcomputer minimum unit (1), IC-card read/write circuit (2), single-chip microcomputer and PC; Single-chip microcomputer minimum unit (1) comprises CPU (U1), oscillatory circuit and reset circuit; IC read/write circuit (2) is made of IC-card feed circuit and IC-card read-write interface; The CPU of single-chip microcomputer minimum unit carries out inner EPRPOM program outside I/O mouth is controlled, its read-write part directly is connected to the IC-card pin with the single-chip processor i/o mouth and reads and writes after the resistance current limliting, communication interface (3) is finished communicating by letter between microcontroller serial port and PC between single-chip microcomputer and PC.

2, a kind of computer utility IC-card controller according to claim 1 is characterized in that: be provided with condition indication circuit, by bi-colour LED indication IC-card duty.

3, a kind of IC card controller for computer according to claim 1 and 2, it is characterized in that: communication interface between single-chip microcomputer and PC (3) adopts the RS232 interface, and to be provided with a level shifting circuit be the RS232 standard signal with the TTL signal transition on the single-chip microcomputer.

4, a kind of IC card controller for computer according to claim 2, it is characterized in that: condition indication circuit is one by resistance R 1, R5, R6, triode D3～D6, the typical push-pull type amplifying circuit that two-color diode CED1, LED constitute, two input ends connect single-chip microcomputer (U1) P3.4, P3.5 mouth respectively.

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