CN2762423Y - Open-phase protection circuit of tax control equipment - Google Patents
Open-phase protection circuit of tax control equipment Download PDFInfo
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- CN2762423Y CN2762423Y CN 200420029436 CN200420029436U CN2762423Y CN 2762423 Y CN2762423 Y CN 2762423Y CN 200420029436 CN200420029436 CN 200420029436 CN 200420029436 U CN200420029436 U CN 200420029436U CN 2762423 Y CN2762423 Y CN 2762423Y
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Abstract
The utility model discloses a power-off protection circuit of a tax control device, which comprises a power supply switching module composed of a filter circuit, a rectification circuit, a high-voltage capacitor, a converting circuit and a filter output circuit. The utility model has the improvement that the protection circuit also comprises a power-off detection circuit formed by the connection of an RC voltage dropping circuit, an AC/DC converting circuit, a photoelectric isolation circuit, an RC filter circuit and a digital signal output circuit. The utility model has the advantages that the protection circuit can conveniently achieve the power-off protection requirement of the tax control device by adjusting the capacity of the high-voltage capacitor, dispensing with additional rechargeable batteries or other energy storage elements; the protection circuit has simple and practical circuits, low cost and no need of maintenance.
Description
Technical field
The utility model relates to a kind of accounting equipment of registering the cash receipt and payment, especially belongs to the power-off protecting circuit of tax controlling equipment.
Technical background
" State Standard of the People's Republic of China GB 18240.1-2003 tax-control cash register part 1: machine standard " requires tax-control cash register should have power-off protection function; tax-control cash register should guarantee the correct, complete of data in tax-controlling memory, invoice memory and the tax-controlling card under the situation of sudden power.For satisfying above-mentioned requirements, common tax controlling equipment all adopts chargeable ni-mh or Ni-Cr battery that back-up source is provided now.After the civil power outage; the battery of power supply provides power supply by the step-up/step-down circuit of special use in support; CPU also will detect the outage of external power supply; finish tax control IC-card read-write immediately, and will be stored in the tax control related data that SRAM etc. do not have a power-off protection storage medium and write non-volatile memory medium with power-off protection.But there is following shortcoming in this method: 1, adopt chargeable ni-mh or Ni-Cr battery, rechargeable battery all exists and discharges and recharges the number of times problem, the requirement in useful life that is difficult to satisfy tax-control cash register more than 5 years; 2, need extra charging circuit and special-purpose buck, complex circuit designs, the facility cost increases.
Summary of the invention
Main purpose of the present utility model is to provide a kind of outage detection and protective circuit of tax controlling equipment, can reach the power-off protection requirement of tax controlling equipment easily.
The technical scheme that the utility model adopted is: it comprises the switch power module that filter circuit, rectification circuit, high-voltage capacitance, translation circuit and filtering output are formed, its improvements are, it also includes the power failure detection circuit that RC reduction voltage circuit and ac-dc conversion circuit, ac-dc conversion circuit and photoelectric isolating circuit, photoelectric isolating circuit and RC filter circuit, RC filter circuit and digital signal output circuit link to each other and formed.
The beneficial effects of the utility model are; after having increased power failure detection circuit; can be by adjusting the capacity of high-voltage capacitance simply; reach the power-off protection requirement of tax controlling equipment easily; do not need extra rechargeable battery or other energy-storage travelling wave tube; circuit is simple and practical, and is with low cost, and avoids safeguarding.
Description of drawings
Fig. 1 is the utility model switch power module circuit block diagram
Fig. 2 is the utility model power failure detection circuit figure
Embodiment
Be the utility model switch power module and power failure detection circuit circuit connection diagram as shown in Figure 1 and Figure 2, as we know from the figure, the utility model comprises the switch power module that filter circuit, rectification circuit, high-voltage capacitance, translation circuit and filtering output are formed, its improvements are, it also includes the power failure detection circuit that RC reduction voltage circuit and ac-dc conversion circuit, ac-dc conversion circuit and photoelectric isolating circuit, photoelectric isolating circuit and RC filter circuit, RC filter circuit and digital signal output circuit link to each other and formed.
In the utility model power failure detection circuit as shown in Figure 2, its annexation with operation principle is: 220 volts of inputs of civil power link to each other with J1, and the pin 2 of J1 links to each other with R1, R1 links to each other with C1, and C1 links to each other with C2, and C2 links to each other with the pin 1 of J1, constitute the RC reduction voltage circuit, C2 two ends output low-voltage ac signal; The bridge rectifier that D1, D2, D3 and D4 form constitutes ac-dc conversion circuit, is connected to the C2 two ends, the low-voltage ac signal at C2 two ends is transformed into low-voltage dc signal, by the positive pole output of bridge rectifier; The positive pole of bridge rectifier links to each other with the pin 1 of photoelectric isolating circuit 4N25, its negative pole links to each other with the pin 2 of 4N25, and the pin 5 of 4N25 is connected to the power end VCC of digital signal output circuit part, the pin 4 of 4N25 is connected to the RC filter circuit of R4 and C3 formation, import normally when civil power, it is the pulse current of 10ms that will there be the cycle in the pin 5 of 4N25 to pin 4, if the civil power outage, pulse current is with very fast disappearance, and its size and duration can realize by the parameter that changes R1, C1 and C2; U2A is the LM393 comparator, its anode connects the RC filter circuit of R4 and C3 formation, its negative terminal input connects the bleeder circuit of R2 and R5 formation, the output of comparator is connected with the R3 resistance of moving VCC to and constitutes digital signal output, is input to CPU, if civil power is normal, it exports high level, civil power outage, output low level then, thus make tax controlling equipment know the variation of city's electricity condition.
It below is operation principle of the present utility model, as shown in Figure 1,220 volts of inputs of civil power, by offering the suitable low-voltage dc power supply of tax controlling equipment after the switch power module step-down, this power supply can be directly or again by behind the power conversion, drives the printer of tax controlling equipment, cash box, CPU, work such as display.
As shown in Figure 2,220 volts of inputs of civil power are by providing real-time power state signal to tax controlling equipment behind the power failure detection circuit.It changes by output signal level informs whether the tax controlling equipment civil power is normal.If civil power is normal, it exports high level, civil power outage, then output low level.
Usually switch power module and power failure detection circuit combination back constitutes the power module of tax controlling equipment.Its connected mode may differently because of the implementation of each tax controlling equipment have difference, but principle is consistent.Promptly, civil power input (AC220) is divided into two-way, and the input of one road civil power is connected to switch power module shown in Figure 1, by exporting low-voltage dc power supply after the conversion of switch power module internal circuit, i.e. " filtering output " is connected to the low-voltage DC source interface of tax controlling equipment; Another road civil power input is connected to " the J1 AC220IN " of power failure detection circuit shown in Figure 2, by producing digital signal after the power failure detection circuit conversion, is connected to the digital signal interface on the tax controlling equipment.
In the switch power module, in the moment of mains supply outage, the voltage at high-voltage capacitance two ends is still greater than 300V, store suitable electric energy, after the mains supply outage, this electric capacity continues to provide electric energy to translation circuit, and switch power module can continue out-put supply a period of time.This time length is relevant with the capacity and the power source loads size of high-voltage capacitance.
In the power failure detection circuit, the input of 220V civil power through the RC filter circuit, produces digital signal output by RC reduction voltage circuit, ac-dc conversion circuit rear drive photoelectric isolating circuit.Selecting the RC time constant when the RC filter circuit is 10ms.The negative terminal input voltage of comparator LM393 is 1/2 VCC in the digital signal output.If mains supply is normal, the every 10ms of photoelectric isolating circuit has pulse current input, and the voltage of RC filter circuit output will remain on more than 2/3 VCC, and digital signal is output as high level; If the mains supply outage, photoelectric isolating circuit does not have input current, and after the RC filter circuit process RC time constant, voltage will drop to 1/3--2/3 VCC, and after 2 times of RC time constants, voltage will be lower than 1/3 VCC, and digital signal is output as low level.Therefore, can in 5--15ms, detect the civil power outage.Digital signal output is as the interruption input signal of CPU, and when digital signal was output as low level, the electric energy that high-voltage capacitance stores will continue to provide electric energy.By adjusting the capacity and the power source loads of high-voltage capacitance, CPU can finish the read-write of tax control IC-card, and the tax control related data is write non-volatile memory medium by volatile storage medium, thereby reaches the power-off protection requirement of tax controlling equipment.
Claims (2)
1, a kind of power-off protecting circuit of tax controlling equipment; it comprises the switch power module that filter circuit, rectification circuit, high-voltage capacitance, translation circuit and filtering output are formed, and it is characterized in that: it also includes the power failure detection circuit that RC reduction voltage circuit and ac-dc conversion circuit, ac-dc conversion circuit and photoelectric isolating circuit, photoelectric isolating circuit and RC filter circuit, RC filter circuit and digital signal output circuit link to each other and formed.
2, the power-off protecting circuit of a kind of tax controlling equipment according to claim 1 is characterized in that: power failure detection circuit is that the pin 2 by J1 links to each other with R1, and R1 links to each other with C1, and C1 links to each other with C2, and C2 links to each other with the pin 1 of J1, constitutes the RC reduction voltage circuit; D1, D2, D3 and D4 constitute bridge rectifier, are connected to the two ends of C2, constitute ac-dc conversion circuit; D1, D2, D3 and D4 constitute bridge rectifier, and its positive pole links to each other with the pin 1 of photoelectric isolating device 4N25, and its negative pole links to each other with the pin 2 of 4N25, and the power end VCC of the digital signal output circuit that the pin 5 of 4N25 is connected to part constitutes photoelectric isolating circuit; The pin 4 of 4N25 is connected to the RC filter circuit of R4 and C3 formation; U2A is the LM393 comparator, the RC filter circuit that its anode connection R4 and C3 constitute, and its negative terminal input connects the bleeder circuit of R2 and R5 formation, and the output of comparator is connected with the R3 resistance formation digital signal output of moving VCC to, is input to CPU.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420029436 CN2762423Y (en) | 2004-07-30 | 2004-07-30 | Open-phase protection circuit of tax control equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420029436 CN2762423Y (en) | 2004-07-30 | 2004-07-30 | Open-phase protection circuit of tax control equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2762423Y true CN2762423Y (en) | 2006-03-01 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200420029436 Expired - Fee Related CN2762423Y (en) | 2004-07-30 | 2004-07-30 | Open-phase protection circuit of tax control equipment |
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| Country | Link |
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| CN (1) | CN2762423Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101907671A (en) * | 2010-06-30 | 2010-12-08 | 北京世纪互联宽带数据中心有限公司 | Low-power consumption power outage detection acquisition system for data center |
| CN104655913A (en) * | 2015-01-29 | 2015-05-27 | 浙江正泰电器股份有限公司 | Low-voltage fault judgment circuit and double power supply changeover switch controller |
-
2004
- 2004-07-30 CN CN 200420029436 patent/CN2762423Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101907671A (en) * | 2010-06-30 | 2010-12-08 | 北京世纪互联宽带数据中心有限公司 | Low-power consumption power outage detection acquisition system for data center |
| CN104655913A (en) * | 2015-01-29 | 2015-05-27 | 浙江正泰电器股份有限公司 | Low-voltage fault judgment circuit and double power supply changeover switch controller |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |