CN101431256A - Power-off protection apparatus - Google Patents
Power-off protection apparatus Download PDFInfo
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- CN101431256A CN101431256A CNA2008101172743A CN200810117274A CN101431256A CN 101431256 A CN101431256 A CN 101431256A CN A2008101172743 A CNA2008101172743 A CN A2008101172743A CN 200810117274 A CN200810117274 A CN 200810117274A CN 101431256 A CN101431256 A CN 101431256A
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Abstract
The invention provides a power-off protection device, comprising a power input interface unit and a power output interface unit; a power-off detecting unit used for detecting the power supply of the power input interface unit and outputting a signal indicating whether the power supply is normal or not; a charging unit used for charging by the power supply of the input interface unit and providing voltage when the power supply is off; a voltage boosting unit used for transforming the voltage provided by the power input interface unit or the charging unit into a stable voltage and transmitting the stable voltage to the power output interface unit.
Description
Technical field
The present invention relates to the power-off protection field, particularly relate to the power-off protection apparatus that a kind of tax-control cash register is used.
Background technology
Usually tax-control cash register does not have power-off protection apparatus; in case generation grid power blackout; all kinds of physical mediums in the tax-control cash register; will interrupt causing between imperfect and each module of transfer of data transfer of data inconsistent because of outage as the single transfer of data between internal memory, tax-controlling memory, invoice memory, tax-controlling card, the subscriber card etc., make troubles to the user.
Some tax-control cash register adopts the inner mode that ups power is set to avoid the loss of data that causes because of outside sudden power.But ups power has the life-span weak point, and the charging interval is long, and volume is big, shortcomings such as price height.
Summary of the invention
In view of this, the invention provides a kind of power-off protection apparatus, so that the stable voltage of a period of time to be provided under the situation of sudden power.
The device of generation television measuring signal provided by the invention comprises power input interface unit and power output interface unit, also comprises: the outage detection unit, be used to detect the power supply of power input interface unit, and whether normally output represent power supply signal; Charhing unit is used for charging by the power supply of input interface unit, and provides voltage when this power supply outage; Boosting unit, the voltage transitions that is used for providing from power input interface unit or charhing unit is that stable voltage flows to the power output interface unit.
As seen from the above, the device of generation television measuring signal provided by the invention can provide the stable voltage of a period of time under the situation of sudden power, effectively avoid causing loss of data because of outside sudden power.
And; the present invention also comprises automatic shutdown unit; disconnect the power supply of charhing unit to the power output interface unit when voltage that being used to detect charhing unit provides is lower than particular value, the voltage that provides at charhing unit disconnects power supply when being lower than particular value, can effectively protect the equipment of the present invention that adopts.
Wherein, described charhing unit comprises: electric capacity protective circuit, forward diode and the electric capacity of the ground connection of connecting successively, the capacitance voltage equalizing circuit of keeping in parallel with electric capacity.Voltage can be provided when outage.
Wherein, described electric capacity comprises the plural farad capacitor of series connection.Connecting plural farad capacitor can heavy-current discharge, can provide stable voltage thus.
Optionally, described electric capacity protective circuit comprises first current-limiting resistance and second current-limiting resistance of series connection.Series limiting resistor can provide effective protection to farad capacitor.
Optionally, describedly keep first equalizing resistance and second equalizing resistance that the capacitance voltage equalizing circuit comprises series connection.The series connection equalizing resistance can prevent to be broken because of electric voltage equalization and electric capacity occur and the overload phenomenon occurs.
Description of drawings
Fig. 1 is the theory diagram of power-off protection apparatus provided by the invention;
Fig. 2 is the circuit diagram of power-off protection apparatus provided by the invention;
Embodiment
Show the theory diagram of power-off protection apparatus provided by the invention as Fig. 1, as shown in the figure, comprise power input interface unit and power output interface unit, also comprise the outage detection unit, charhing unit, boosting unit, unit automatically shuts down.
Wherein between described power input interface unit and power output interface unit, connect the outage detection unit; Also be connected with charhing unit and boosting unit at described power input interface, the other end of described charhing unit is connected with automatic shutdown unit, the other end of described automatic shutdown unit is connected with the boosting unit input, and described boosting unit output connects the power output interface unit.
The outage detection unit is used to detect the input voltage of power input interface unit, then the outage detection unit is to the signal port output high level of power output interface unit when detecting this voltage operate as normal, and the outage detection unit is to the signal port output low level of power output interface unit when detecting the external power source outage; Charhing unit is used for charging when externally power supply provides voltage, and voltage is provided during the external power source outage; The voltage transitions that boosting unit is used for providing from power input interface unit or charhing unit is stable voltage, flows to the power output interface unit then; Automatically the shutdown unit is used for when the voltage that detects charhing unit and provide is lower than particular value the disconnection charhing unit to the power supply of power output interface unit.
Below, so that the present invention to be applied in tax-control cash register be example the operation principle of device provided by the invention is introduced, wherein, apparatus of the present invention are connected between the transformer output and mainboard at tax-control cash register input power supply place, and the signal port of apparatus of the present invention power output interface unit is connected with the tax-control cash register micro controller unit.During operate as normal, powered by the power input interface unit by external power source, the power input interface unit charges to charhing unit simultaneously.
After the outage; the outage detection unit detects when the voltage of power input interface unit input drops to a certain set point; promptly produce a reset signal; this reset signal is transferred to micro controller unit by the signal port of power output interface unit; power supply with notice micro controller unit external power source is interrupted, triggers necessary safeguard measures such as carrying out data backup when micro controller unit is received this reset signal.
Meanwhile, charhing unit begins power supply, and boosting unit is raised to the voltage of charhing unit output+5V, offers the work on voltage of usefulness of mainboard by the power output interface unit.
The voltage of charhing unit output is with the linear decline of electric weight, when the supply power voltage that detects charhing unit when automatic shutdown unit drops to another set point, cuts off the power supply circuits of charhing unit, realizes shutdown automatically.
As seen from the above, after outage, during the charhing unit power supply, tax-control cash register can be finished operations such as data necessary backup, avoids causing damage because of the burst outage.
Fig. 2 shows the circuit diagram of power-off protection apparatus provided by the invention; as shown in the figure; the outage detection unit adopts power supply detection chip MAX809LTR; be used for detecting in real time the power input interface unit+magnitude of voltage of 5v_IN; during operate as normal, this power supply detection chip output high level drops to when being lower than 4.63v when detecting voltage; output low level, this output level output to the signal end of power output interface unit as reset signal.
Charhing unit comprises that super capacitor, Schottky diode D5 that the series connection of two farad capacitors forms adopt SS22, the electric capacity protective circuit that forms by the first current-limiting resistance R6 and second current-limiting resistance R8 series connection and by the first equalizing resistance R7 and the second equalizing resistance R9 connect form keep the capacitance voltage equalizing circuit; the electric capacity protective circuit is connected with diode; described super capacitor one end and the negative pole that is connected diode; one end is connected with ground, and it is in parallel with electric capacity to keep the capacitance voltage equalizing circuit.R6 and R8 are current-limiting resistance, are used to protect farad capacitor, and the effect of Schottky diode D5 is a forward conduction, oppositely ends.R7 and R9 are used for keeping electric voltage equalization on two farad capacitors, prevent to be broken because of electric voltage equalization electric capacity to occur and the overload phenomenon occurs.
Boosting unit is connected and composed by voltage transitions chip LM3478MMX and N-channel MOS FETSI4420DY, unsettled farad capacitor voltage and through voltage behind the D4 greatly about 4.8v+5v_IN is converted into stable 5v voltage through voltage transitions chip LM3478MMX and N-channel MOS FETSI4420DY.
Automatically the shutdown unit is connected and composed by voltage comparator LM339 triode Q1 and P channel mosfet SI4933DY.Voltage comparator LM339 detects the voltage VC1 that the charhing unit farad capacitor provides, when the voltage VC1 that provides when farad capacitor drops to and is lower than 3.4v, voltage comparator LM339 output low level, triode becomes cut-off state thereupon, VC1 stops output, and VC2 also stops output simultaneously.
The course of work when below in conjunction with Fig. 2 the present invention being applied to tax-control cash register is introduced.During operate as normal, tax-control cash register by the power input interface unit by the outside+the 5v power voltage supply, the Schottky diode D5 conducting of charhing unit is simultaneously charged to super capacitor, the power supply detection chip MAX809LTR of outage detection unit is by the signal end output high level of power output interface unit, approximately reduce to 4.8v behind the external voltage process diode D4, the voltage transitions chip LM3478MMX of process boosting unit boosts to stable+5V.
Behind the tax control cash receiving tester in power-down state; by power input interface unit input+5V_IN voltage is 0V; when the power supply detection chip MAX809LTR of outage detection unit detects that voltage drops to 4.63V in the device; promptly produce the low level reset signal and export to the micro controller unit MCU of tax-control cash register by the signal end of power output interface unit; MUC interrupts the PWR_INT power supply according to this low level reset signal, and the micro controller unit MCU of tax-control cash register carries out necessary safeguard measures such as data backup.
Meanwhile, the super capacitor of charhing unit begins to provide about 3.4 to 4.8v VC2 voltage, Schottky diode D5 ends, and VC2 boosts to+5V by the voltage transitions chip LM3478MMX of boosting unit, the mainboard that the offers tax-control cash register voltage of usefulness that works on.
The voltage of the super capacitor of charhing unit is with the linear decline of electric weight, detect the voltage VC1 of super capacitor when automatic shutdown unit in real time from voltage comparator LM339, when the supply power voltage that detects super capacitor drops to 3.4v, output low level, close triode Q1, and then close the path of VC1 and VC2, realize the tax control cash receiving auto-shut-off.
Further, because when normal power supply, the power supply detection chip MAX809LTR of outage detection unit is by the signal end output high level of power output interface unit, therefore can also be with this high level signal as enabling signal, after the micro controller unit MCU of tax-control cash register receives this enabling signal, automatically start tax-control cash register, to realize the autostart function behind the outside power interruption recovering.Certainly, this needs tax-control cash register to possess function corresponding, and is set to start automatically by this signal.
More than be that example describes to be applied to tax-control cash register, be understood that the present invention can be applied to the equipment that other need power-off protection equally, as projector, television set etc.
The above only is preferred embodiment of the present invention, and is in order to restriction the present invention, within the spirit and principles in the present invention not all, any modification of being done, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (9)
1. a power-off protection apparatus comprises power input interface unit and power output interface unit, it is characterized in that, also comprises:
The outage detection unit is used to detect the power supply of power input interface unit, and whether normally output represent power supply signal;
Charhing unit is used for charging by the power supply of input interface unit, and provides voltage when this power supply outage;
Boosting unit, the voltage transitions that is used for providing from power input interface unit or charhing unit is that stable voltage flows to the power output interface unit.
2. device according to claim 1 is characterized in that, also comprises: the unit that shuts down automatically disconnects the power supply of charhing unit to the power output interface unit when voltage that being used to detect charhing unit provides is lower than particular value.
3. device according to claim 1 and 2 is characterized in that, described charhing unit comprises:
Electric capacity protective circuit, forward diode and the electric capacity of connecting ground connection successively, the capacitance voltage equalizing circuit of keeping in parallel with electric capacity.
4. device according to claim 3 is characterized in that, described electric capacity comprises the plural farad capacitor of series connection.
5. device according to claim 3 is characterized in that, described electric capacity protective circuit comprises first current-limiting resistance and second current-limiting resistance of series connection.
6. device according to claim 3 is characterized in that, describedly keeps first equalizing resistance and second equalizing resistance that the capacitance voltage equalizing circuit comprises series connection.
7. device according to claim 1 and 2 is characterized in that, described outage detection unit comprises power supply detection chip MAX809LTR.
8. device according to claim 1 and 2 is characterized in that, described boosting unit comprises voltage transitions chip LM3478MMX and the N-channel MOS FETSI4420DY that connects successively.
9. device according to claim 1 and 2 is characterized in that, described automatic shutdown unit comprises voltage comparator LM339, triode Q1 and the P channel mosfet SI4933DY that connects successively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008101172743A CN101431256A (en) | 2008-07-28 | 2008-07-28 | Power-off protection apparatus |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008101172743A CN101431256A (en) | 2008-07-28 | 2008-07-28 | Power-off protection apparatus |
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| CN101431256A true CN101431256A (en) | 2009-05-13 |
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| CNA2008101172743A Pending CN101431256A (en) | 2008-07-28 | 2008-07-28 | Power-off protection apparatus |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102541238A (en) * | 2011-12-31 | 2012-07-04 | 数源科技股份有限公司 | Outage protector used for embedded computer and realization method thereof |
| CN102901936A (en) * | 2012-10-19 | 2013-01-30 | 海信（山东）空调有限公司 | Poweroff detection method of alternating current power supply and poweroff protection method of direct current inverter compressor |
| CN103064497A (en) * | 2011-10-21 | 2013-04-24 | 研祥智能科技股份有限公司 | Power source delayed power supply device, network main board and network host |
| CN104199535A (en) * | 2014-09-05 | 2014-12-10 | 浪潮(北京)电子信息产业有限公司 | Digital power supply device and method |
| CN105786726A (en) * | 2014-12-25 | 2016-07-20 | 研祥智能科技股份有限公司 | Computer architecture of heterogeneous hybrid memory, and data protection method when computer architecture is powered down |
| CN107846070A (en) * | 2016-09-20 | 2018-03-27 | 研祥智能科技股份有限公司 | Signal box return wire electric supply installation |
| CN109542826A (en) * | 2018-12-03 | 2019-03-29 | 郑州云海信息技术有限公司 | A kind of SPI communicating control method, device, equipment and system |
| CN109564457A (en) * | 2018-10-30 | 2019-04-02 | 深圳市锐明技术股份有限公司 | A kind of power-off protecting circuit for mobile unit, apparatus and system |
| CN109660015A (en) * | 2019-02-15 | 2019-04-19 | 成都信息工程大学 | Uninterruptible power supply and uninterrupted power supply method with seamless switching ability |
-
2008
- 2008-07-28 CN CNA2008101172743A patent/CN101431256A/en active Pending
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103064497A (en) * | 2011-10-21 | 2013-04-24 | 研祥智能科技股份有限公司 | Power source delayed power supply device, network main board and network host |
| CN103064497B (en) * | 2011-10-21 | 2017-11-24 | 研祥智能科技股份有限公司 | Power supply Time-delay power supply unit, network main board and network host |
| CN102541238A (en) * | 2011-12-31 | 2012-07-04 | 数源科技股份有限公司 | Outage protector used for embedded computer and realization method thereof |
| CN102901936A (en) * | 2012-10-19 | 2013-01-30 | 海信（山东）空调有限公司 | Poweroff detection method of alternating current power supply and poweroff protection method of direct current inverter compressor |
| CN104199535A (en) * | 2014-09-05 | 2014-12-10 | 浪潮(北京)电子信息产业有限公司 | Digital power supply device and method |
| CN105786726A (en) * | 2014-12-25 | 2016-07-20 | 研祥智能科技股份有限公司 | Computer architecture of heterogeneous hybrid memory, and data protection method when computer architecture is powered down |
| CN107846070A (en) * | 2016-09-20 | 2018-03-27 | 研祥智能科技股份有限公司 | Signal box return wire electric supply installation |
| CN107846070B (en) * | 2016-09-20 | 2024-03-22 | 研祥智慧物联科技有限公司 | Signal box return wire power supply device |
| CN109564457A (en) * | 2018-10-30 | 2019-04-02 | 深圳市锐明技术股份有限公司 | A kind of power-off protecting circuit for mobile unit, apparatus and system |
| CN109564457B (en) * | 2018-10-30 | 2022-08-02 | 深圳市锐明技术股份有限公司 | Power-off protection circuit, device and system for vehicle-mounted equipment |
| CN109542826A (en) * | 2018-12-03 | 2019-03-29 | 郑州云海信息技术有限公司 | A kind of SPI communicating control method, device, equipment and system |
| CN109542826B (en) * | 2018-12-03 | 2021-10-29 | 郑州云海信息技术有限公司 | SPI communication control method, device, equipment and system |
| CN109660015A (en) * | 2019-02-15 | 2019-04-19 | 成都信息工程大学 | Uninterruptible power supply and uninterrupted power supply method with seamless switching ability |
| CN109660015B (en) * | 2019-02-15 | 2023-10-13 | 成都信息工程大学 | Uninterruptible power supply with seamless switching capability and uninterruptible power supply method |
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Application publication date: 20090513 |