CN2629129Y

CN2629129Y - Tax control cash collecting machine capable of permanently storing data

Info

Publication number: CN2629129Y
Application number: CN 03261694
Authority: CN
Inventors: 魏恺言
Original assignee: ZHAORI INFORMATION TECHNOLOGY
Current assignee: Shenzhen Sinosun Technology Co., Ltd.
Priority date: 2003-05-27
Filing date: 2003-05-27
Publication date: 2004-07-28
Anticipated expiration: 2013-05-27

Abstract

The utility model relates to a tax controlled cash receipting machine that can save data for a long time, which comprises a CPU, a first storage to realize tax control treatment under the control of the CPU, a second storage used to store data permanently and connecting with the CPU for communication, and a backup power supply circuit unit which comprises a power supply switching circuit, the power supply switching circuit being connected between the CPU and peripheral devices thereof and the external power supply, and being electrically connected with a backup power supply to activate the backup power supply to run the CPU and peripheral devices thereof in case the external power supply off. The CPU gives a data backup demand after receiving the external power supply off signal, and saves data in the first storage into the second storage which is a flash storage. Since the utility model adopts a flash storage to store backup data, the storage time is long and the cost is cheap.

Description

But a kind of tax-control cash register of storing data permanently

Technical field

The utility model relates to a kind of tax-control cash register, relates in particular to the improvement that it preserves memory of data.

Background technology

Tax-control cash register is a kind of cashing machine that has tax control function with law seriousness and infrangibility, and it is not only the competent assistant of commercial enterprise management management, also is the taxing data are gathered by the tax authority to enterprise law enforcement representative.Automatic record is equipped with but the tax-controlling memory that can not change and erase in its inside, writing down business data and the tax liability of every day, so that can transmit tax-control data accurately and effectively to the office of paying taxes by all means, for preventing being distorted of data, its general special " lead sealing " means that adopt is fixed on machine intimate, and anyone can not open except that the tax and full-time registration maintenance personal.

In general, tax-control cash register consists of the following components: 1, the display system of energy Chinese display; 2, can print the print system of Chinese; 3, special-purpose central processing system, i.e. CPU; 4, special-purpose tax control disposal system, CPU carries out the first memory of sequential operation comprising assistance, and the second memory of the permanent record data of trying one's best; 5, dedicated peripherals drive system comprises peripheral hardwares such as keyboard, mouse; 6, power supply, battery system; 8, the cabinet of band physical security assurance; 9, handling procedure etc.That the second memory that is used for the stored record data of existing tax-control cash register generally adopts is static memory SRAM, after tax-control cash register power down or shutdown, rely on the data of backup battery assurance SRAM not lose, this is that power down is loss of data because static memory can not power down; But because static memory power consumption is bigger, and the big more power consumption of memory span is big more; Therefore, when the tax-control cash register that uses static memory is stopped using, when if the capacity of static memory is very big, the storage time of data will not enough half a year, and for tax-control data, especially the backup at big data quantity is that requirement was stored more than 10 years, and therefore the data storage of existing tax-control cash register is undesirable.In addition, the back-up source of existing support static memory generally is a lithium battery, the serviceable life of lithium battery is generally about 5 years, therefore, tax-control cash register is after using more than 5 years, and wherein Cun Chu data are irretrievably lost possibility and raise greatly, in case the back-up source breaking-up, the data of the last storage will irretrievably be lost, thereby cause tax control function to suffer damage.

Summary of the invention

But the purpose of this utility model promptly is to provide a kind of tax-control cash register of storing data permanently, its second memory with the back-up storage data changes flash memory flash into, utilize the ability of the permanent storage data of flash memory, overcome the loss of data defective that existing tax-control cash register may occur.And the flash memory cost is low far beyond static memory, can reduce cost.

But the tax-control cash register of a kind of storing data permanently of the present utility model, it comprises a CPU, and under this CPU control, realize the first memory that tax control is handled, and one be used for the second memory that permanent data stores, be connected with described CPU communication, wherein, described tax-control cash register also comprises a power backup circuit unit, it comprises a power supply switch circuit, be connected between described CPU and peripheral equipment thereof and the external power, be electrically connected with a back-up source simultaneously, be used for enabling back-up source when external power interrupts and drive CPU and peripheral equipment thereof; Described CPU promptly sends data backup command behind the signal that receives the external power interruption, the data in the described first memory are saved in the described second memory; Described second memory is a flash memory.

Described tax-control cash register, wherein, described power backup circuit unit also comprises a charging circuit, is electrically connected with described external power and back-up source, is used for charging to back-up source.

Described tax-control cash register, wherein, described power backup circuit unit also comprises a charge-discharge protection circuit, is electrically connected with described back-up source, and is electrically connected with described charging circuit and power supply switch circuit respectively, is used to protect described back-up source.

Described tax-control cash register, wherein, described back-up source is a lithium battery.

But the tax-control cash register of a kind of storing data permanently of the present utility model, because employing is the second memory of flash memory as the back-up storage data, storage time is permanent, data storage safety, and cost is low.

Brief Description Of Drawings

Below in conjunction with accompanying drawing,, will make the technical solution of the utility model and beneficial effect thereof apparent by detailed description to the utility model preferred embodiment.

In the accompanying drawing,

But Fig. 1 is the partial circuit block scheme of the tax-control cash register of a kind of storing data permanently of the present utility model;

But Fig. 2 A and Fig. 2 B are respectively power supply switching and mu balanced circuit, charging circuit and the charge-discharge protection circuit circuit theory diagrams of the tax-control cash register of a kind of storing data permanently of the present utility model;

Fig. 3 writes data the schematic diagram of flash memory from synchronous dynamic random access memory SDRAM for tax-control cash register power down of the present utility model or shutdown back CPU.

Embodiment

The utility model promptly is to have utilized flash memory flash technology, flash memory still can keep institute's data information stored under powering-off state, but its data write is not to be unit with single byte but to be unit with fixing block, so speed is static and dynamic storage is slow.Its block size generally by 256K to 20MB, so its memory capacity is big, and the price of flash chip is not high, cost is low.Flash memory is becoming the substitute of EPROM at present, because they are easy to be upgraded.

As shown in Figure 1, but be the partial circuit block scheme of the tax-control cash register of a kind of storing data permanently of the present utility model,, do not repeat them here because other partial circuits of tax-control cash register of the present utility model are the content of prior art.In the tax-control cash register of the present utility model, also be provided with a power supply switch circuit 130 between the CPU120 of external power 110 and tax-control cash register, this power supply switch circuit 130 cuts off being electrically connected of CPU and a back-up source 140 under external power continued power situation; And outside during power interruption, back-up source can be switched to power supply, the usefulness of the operation of supply tax-control cash register.The CPU of described tax-control cash register connects simultaneously and controls one and realize the first memory 210 that tax control is handled, and as shown in Figure 3, is for general under the controlling of described CPU and carries out the tax control computing; And a second memory 220, be used for comparatively permanent preservation data.This second memory 220 of the present utility model is flash memory flash, because its speed that reads and writes data is slow, therefore, simultaneously, tax-control cash register of the present utility model also is provided with a back-up source support, this concrete back-up source can the time lithium battery.When external power was powered continually and steadily, this external power 110 charged by 150 pairs of these back-up sources 140 of a charging circuit simultaneously.In addition, also be provided with a charge-discharge protection circuit 151 before back-up source, the dash current when preventing to discharge and recharge is to the infringement of back-up source.

Circuit theory is shown in Fig. 2 A and Fig. 2 B, and external power 110 is 5V, is serially connected with a diode D11, D12 in the same way respectively simultaneously with in the power backup circuit, can switch between external power and back-up source by this two diode.Also be provided with a mu balanced circuit 160 simultaneously and be serially connected in the feed circuit, also be provided with a control chip 170 simultaneously, when external power 110 interrupts suddenly, can experience look-at-me, and to the signal of CPU transmission about this power interruption.In Fig. 2 B, what illustrate is a charging circuit 150 of the present utility model and a charge-discharge protection circuit 151, is connected on the described back-up source 140, is used to prevent this back-up source 140, and promptly a rechargeable battery suffers dash current in charge and discharge process.

As shown in Figure 3, in tax-control cash register of the present utility model, the effect of described back-up source 140 is, when external power 110 interrupts, described CPU120 can in time send the instruction of data backup after receiving the signal (as power down or shutdown) that external power interrupts, the data to be backed up that are stored in the first memory of volatibility RAM are write flash memory.Because the read or write speed of flash memory is slow, therefore, this power supply switch circuit and back-up source can guarantee data security writes flash memory.And because flash memory is preserved the non-powered support of data, and can reach its serviceable life more than 100 years, therefore, will be very permanent with the data that flash memory is preserved.Simultaneously, the price of flash memory is lower, therefore can reduce cost effectively.

In sum; but the tax-control cash register of a kind of storing data permanently of the present utility model; its technical scheme and beneficial effect thereof are to those skilled in the art; can change or replace, and all these changes or replacement all should belong to the protection domain of the utility model appended claim.Specification digest

Claims

But 1, a kind of tax-control cash register of storing data permanently, it comprises a CPU, and under this CPU control, realize the first memory that tax control is handled, and one be used for the second memory that permanent data stores, be connected with described CPU communication, it is characterized in that described tax-control cash register also comprises a power backup circuit unit, it comprises

One power supply switch circuit is connected between described CPU and peripheral equipment thereof and the external power, is electrically connected with a back-up source simultaneously, is used for enabling back-up source when external power interrupts and drives CPU and peripheral equipment thereof;

Described CPU promptly sends data backup command behind the signal that receives the external power interruption, the data in the described first memory are saved in the described second memory;

Described second memory is a flash memory.
2, tax-control cash register according to claim 1 is characterized in that, described power backup circuit unit also comprises a charging circuit, is electrically connected with described external power and back-up source, is used for charging to back-up source.
3, tax-control cash register according to claim 2; it is characterized in that described power backup circuit unit also comprises a charge-discharge protection circuit, be electrically connected with described back-up source; and be electrically connected with described charging circuit and power supply switch circuit respectively, be used to protect described back-up source.
4, tax-control cash register according to claim 3 is characterized in that, described back-up source is a lithium battery.