CN104794413A

CN104794413A - Non-contact IC card energy adaptation method

Info

Publication number: CN104794413A
Application number: CN201410427363.3A
Authority: CN
Inventors: 包乌日吐; 王延斌; 马哲
Original assignee: Beijing CEC Huada Electronic Design Co Ltd
Current assignee: Beijing CEC Huada Electronic Design Co Ltd
Priority date: 2014-08-27
Filing date: 2014-08-27
Publication date: 2015-07-22

Abstract

The invention discloses a non-contact IC card energy adaptation method, which is mainly applied to the field of non-contact smart card design. By adopting the method, the work efficiency of a non-contact IC card can be adjusted automatically according to the energy of a radio frequency field. Finally, the following purpose is achieved: the work efficiency is improved to make a non-contact IC card work under higher performance as far as possible when the radio-frequency field intensity is large enough, and the work efficiency is reduced to make sure that a smart card can still work normally and prevent system reset when the radio-frequency field intensity is small. By adopting the method, power consumption management of non-contact IC cards is more effective, and higher energy utilization rate can be achieved.

Description

A kind of non-contact IC card energy self-adaptation method

Technical field

The present invention is mainly used in contactless IC card system power dissipation design field, relates to a kind of non-contact IC card energy self-adaptation method.

Background technology

Along with the development of computer software technology and integrated circuit, the application of IC-card is more and more extensive, is mainly used in the fields such as legal certificate, telecommunications (phonecard, GSM card, 3G card), health care, amusement, public transport, admission ticket, gate inhibition, identification, finance and pay TV.Wherein the development of non-contact IC card is relatively rapider, and application also constantly expands.

Non-contact IC card and read-write equipment not by Mechanical Contact, but utilize radio-frequency technique (radio frequencyidentification, RFID), are carried out the interactive operation of IC-card by electromagnetic transmission.The System Working Principle of non-contact IC card is, system is bi-directional data between read write line and IC-card in a half duplex manner.After the Signal coding that read write line will send, be carried in the carrier signal of characteristic frequency, outwards send through antenna; After the IC-card entering read write line perform region receives pulse signal, signal acquisition supply voltage and the reset thus of radio frequency interface module on the one hand in chip, clock signal, circuits simultaneously in this chip carries out demodulation, decoding, deciphering to this signal, then command request, password, authority etc. are judged, control logic circuit reads for information about from storer, after encryption, coding, modulation, send to card reader process through card internal antenna.

The energy of non-contact IC is obtained by radio-frequency field, and the capacity volume variance therefore obtained under different field intensity is larger, is in particular in that non-contact IC card is more responsive to the transmitting field intensity of the distance of card reader, card reader, the direction of marching into the arena etc.Tradition stationarity workable contactless IC card power managed scheme cannot take into account performance and work field strength range; Namely after focusing on performance, the power consumption of IC-card itself cannot be operated in more greatly lower work field intensity, after focusing on work field strength range, although can be operated in lower work field intensity, cannot obtain higher performance in the sufficient situation of energy; Final result is that user's health check-up is poor.The present invention by detecting dump energy, and carries out the adjustment of non-contact IC card duty according to current testing result, reach work at present power consumption and accept energy perfect matching with institute.The invention solves the problem that non-contact IC card " cannot take into account performance and work field intensity ", make non-contact IC be stuck in energy enough when be operated in high performance state as far as possible, when energy deficiency, under being operated in lower field intensity by reduction performance as far as possible.

Summary of the invention

The invention discloses a kind of non-contact IC card energy self-adaptation method, by a kind of reasonably, while efficient adaptive machine-processed raising non-contact IC card serviceability, minimum work field intensity can be reduced.

A kind of non-contact IC card energy self-adaptation method, contains original state IDLE, energy surplus state ADD, energy shortcoming state SUB, state such as severe energy shortcoming state SSUB, the moderate state RETEN of energy etc.Specific works comprises following steps:

(1), during system reset, initial state IDLE is entered;

(2) entering ADD state when energy surplus being detected, and improve the serviceability of smart card, can be that (but being not limited to) improves dominant frequency or enter concurrent operating modes, under making smart card be operated in higher Energy Efficiency Ratio;

(3) SUB state is entered when detecting that energy is short of, and the serviceability of smart card is reduced, can be that (but being not limited to) reduces dominant frequency or enter work in series pattern, ensure that the energy of smart card consumption and the energy of acceptance match;

(4) SSUB state is entered when detecting that energy is seriously short of, and the serviceability of smart card is significantly reduced, can be that (but being not limited to) reduces rapidly dominant frequency or enter work in series pattern, ensure that the energy of smart card consumption and the energy of acceptance match;

(5) when detecting that energy enters RETEN state when mutually mating with current power consumption, current serviceability is kept not change;

(6) by detecting the dump energy that smart card accepts, can be that (but being not limited to) detects curtage mode, the duty of current smart card is adjusted, accept energy perfect matching to reach work at present power consumption with institute.Make smart card be operated in high performance state when energy is enough, when energy deficiency, under being operated in lower field intensity by reduction performance as far as possible as far as possible;

Accompanying drawing explanation

Fig. 1 contactless IC card and card reader Communication Model

The constitutional diagram of Fig. 2 non-contact IC card energy self-adaptation method.

Embodiment

To the preferred embodiment of the present invention be described in more detail below, show preferred case study on implementation of the present invention in the accompanying drawings.But, the present invention can realize in a variety of manners and to should not be construed limit by the case study on implementation of setting forth here.These case study on implementation are provided to be to make the present invention more thorough and complete, and, completely scope of the present invention is conveyed to the person skilled of this area.

Further combined with chart, the present invention is described below.

As shown in Figure 1, for contactless IC card and card reader Communication Model, card obtains energy by pickup coil, AI is analog radio frequency front end, non-contact IC working power is generated by rectification, mu balanced circuit, also achieve the testing circuit of dump energy in this module, can adopt current detecting, also can be voltage detecting mode or both adopt simultaneously.

As shown in Figure 2, for a kind of non-contact IC card energy self-adaptation method, give State Transferring relation and the state transition condition of this invention, non-contact IC card is according to the change obtaining energy from radio-frequency field, and by self work efficiency of adjustment, adapt to current radio-frequency field energy, ensure that capacity usage ratio maximizes, and then improve the stability of power supply system, the reliability of raising chip.

Be initial state IDLE when non-contact IC card powers on, enter different duties (comprising ADD, SUB, SSUB, RETEN) according to energy detection results (ENERGY_DET) more afterwards.When ENERGY_DET=2b ' 00, from IDLE state transition to RETEN; When ENERGY_DET=2b ' 01, from IDLE state transition to ADD; When ENERGY_DET=2b ' 10, from IDLE state transition to SUB; When ENERGY_DET=2b ' 11, from IDLE state transition to SSUB.In like manner, under other states outside IDLE, root pick ENERGY_DET indicator signal, also can jump to other states corresponding.The explanation of each energy self-adaptation state is see table 1; The coding of energy measuring indicator signal is see table 2; Self-adaptation state transition condition is see table 3.

Table 1

Table 2

Table 3

Self-adaptation state transition condition	Explanation
		A	System reset
B	ENERGY_DET＝2b’01
		C	System reset
D	ENERGY_DET＝2b’00
		E	ENERGY_DET＝2b’10

F	ENERGY_DET＝2b’11

According to thought of the present invention, in conjunction with the system design considerations of concrete non-contact IC, the quantity of the duty (comprising IDLE, ADD, SUB, SSUB, RETEN) mentioned in this preferred version and the coding of energy measuring signal (ENERGY_DET), can carry out increasing or reduce design.

Can be understood as, do not departing from main body situation described herein, the various details describing theme herein can be changed.In addition, before describe only for illustration of object, instead of the object in order to limit.

Claims

1. a non-contact IC card energy self-adaptation method, it is characterized in that when contactless IC card changes from the energy that radio-frequency field obtains, current radio-frequency field energy variation is adapted to by the performance adjusting self, ensure the maximization of capacity usage ratio, and then improve the stability of power supply system, the reliability of raising chip, comprise IDLE state, energy surplus state ADD, energy shortcoming state SUB, severe energy shortcoming state SSUB, the moderate state RETEN of energy; Wherein:

Upon system reset, initial state IDLE is entered;

Enter ADD state when energy surplus being detected, and the serviceability of smart card is improved, dominant frequency can be improved or enter concurrent working, under making smart card be operated in higher Energy Efficiency Ratio;

Enter SUB state when detecting that energy is short of, and the serviceability of smart card is reduced, dominant frequency can be reduced or enter work in series pattern, ensure that the energy of smart card consumption and the energy of acceptance match;

Enter SSUB state when detecting that energy is seriously short of, and the serviceability of smart card is significantly reduced, dominant frequency can be reduced rapidly or enter work in series pattern, ensure that the energy of smart card consumption and the energy of acceptance match;

When detecting that energy enters RETEN state when mutually mating with current power consumption, current serviceability is kept not change.

2. a kind of non-contact IC card energy self-adaptation method as claimed in claim 1, it is characterized in that the dump energy accepted by detecting smart card, curtage mode can be detected, the duty of current smart card is adjusted, to reach work at present power consumption and the energy match that accepts, make smart card be operated in high performance state when energy is enough, when energy deficiency, under being operated in lower field intensity by reduction performance as far as possible as far as possible.