CN102590588A - Instantaneous power-down monitoring device and power-down processing method for DC power supply - Google Patents

Instantaneous power-down monitoring device and power-down processing method for DC power supply Download PDF

Info

Publication number
CN102590588A
CN102590588A CN2012100417612A CN201210041761A CN102590588A CN 102590588 A CN102590588 A CN 102590588A CN 2012100417612 A CN2012100417612 A CN 2012100417612A CN 201210041761 A CN201210041761 A CN 201210041761A CN 102590588 A CN102590588 A CN 102590588A
Authority
CN
China
Prior art keywords
power
supply
voltage
power supply
unit
Prior art date
Application number
CN2012100417612A
Other languages
Chinese (zh)
Inventor
周岗
陈永冰
陈阳
李文魁
贾玉柱
李光磊
Original Assignee
海军工程大学
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 海军工程大学 filed Critical 海军工程大学
Priority to CN2012100417612A priority Critical patent/CN102590588A/en
Publication of CN102590588A publication Critical patent/CN102590588A/en

Links

Abstract

The invention discloses an instantaneous power-down monitoring device and a power-down processing method for a DC power supply, belonging to the technical field of power-down protection of electronic products. The instantaneous power-down monitoring device can monitor a circuit board power supply in real time, provide a power-down signal when the power supply is powered down or powered off, and the device can provide short time power supply for micro-processing chips and power-down protection auxiliary devices in the electronic products; and the power-down processing method is fit for the electronic products utilizing the micro-processing chips, and the power-down processing method completes such power-down protection actions within a short power supply time of the device, for example, data storage, system working state adjustment, alarm information transmission and error information transmission, etc. The device and the method disclosed by the invention are fit for the DC power supply and have the advantages of extensive application range, simplicity in the circuit, low cost and reliability in working, etc.

Description

A kind of direct supply instantaneous power-down monitoring device and power down process method

Technical field

The present invention relates to a kind of power supply instantaneous power-down monitoring device and power down process method, belong to electronic product power down protection technical field.

Background technology

In the practical applications, many electronic products need to accomplish the power down protection action when system exception power down or shutdown, as preserving data, Adjustment System duty, send alerting signal, sending error message etc.

Because the system power consumption that PC constitutes is big, shutdown process is complicated and need the long time, when input power supply instantaneous power-down, needs standby power supply to guarantee that system can normal shutdown.Like Chinese invention patent " power-off protection method, device, logical device and storage system " (application number: 200710307035.X) and Chinese invention patent " a kind of power-off protection method, system and device " (application number: the method that adopts 200710198976.4).

In the practical applications; A large amount of electronic products adopt little process chip (like single-chip microcomputer, DSP, PLD etc.); Because little process chip power consumption is little; The action that need accomplish after fast operation, the system's power down is less, therefore adopts standby power supply and said method to solve the problem of importing power supply power-fail, the complexity and the cost of the remarkable increase of meeting system.

To the power supply power-fail problem that relates in the electronic product that adopts little process chip, domestic multinomial patent has provided different solutions.As Chinese utility model patent " roller washing machine power loss detection means " (application number: CN201020188930.1) and Chinese invention patent " automatic washing machine instantaneous power-down memory circuit and disposal route thereof " (application number: the power failure detection method that 201010529539.8) provides is the AC signal that detects the ac input end of direct supply, judges whether power down of power supply according to having or not of AC signal.Its shortcoming is to detect the ac input end of direct supply, and in most of application scenarios, direct supply does not have ac input end or ac input end not on circuit board, and therefore above-mentioned detection method only limits to have the direct supply of ac input end.In addition; Disposal route in the foregoing invention patent can not be eliminated the false triggering that power-supply fluctuation produces; Shown in Figure 2 as among " automatic washing machine instantaneous power-down memory circuit and disposal route thereof " embodiment, its last two steps are system closedowns and wait for complete power down, so the false triggering meeting that power-supply fluctuation produces makes system get into waiting status; If this moment, system power supply recovered normal; Then system also will continue to wait for power supply power-fail, and system no longer receives outside any instruction, be in the state of a kind of similar " deadlock ".

Chinese invention patent " power-failure memory protection method " (application number: 200910105019.1) provide a kind of power-down data protection method of uninterrupted preservation data; This method the has adopted software programming power down protection of data; Its subject matter is the computation burden that has significantly increased system; Also increased the erasable number of times of scratch pad memory simultaneously, shortened the serviceable life of scratch pad memory, and the data that system preserves when outage possibly not the data of last moment.

China's utility model patent " a kind of power down data are preserved circuit " (application number: provided a kind of power down data that constitute by single-chip microcomputer, resistance and electric capacity CN201020285186.7) and preserved circuit.Terminal voltage signal before this patent adopts the single-chip microcomputer with voltage detecting function to detect, when current terminal voltage was lower than certain setting value, this single-chip microcomputer output look-at-me accomplished the power down protection action for another 32 bit CPU.The method that this patent provides relates to two CPU, and circuit is complicated, and can find out that by embodiment it is only applicable to a kind of special low pressure single-chip microcomputer STC12C5202AD, is not suitable for other single chip circuit; Simultaneously, when voltage power down to be detected, this patent needs the power supply of 32 bit CPUs can operate as normal, could realize the preservation of data.During voltage power down to be detected, the supply voltage of 32 bit CPUs is power down simultaneously also, the power supply ability normal power supply that this patent does not provide method behind power supply power-fail, to guarantee 32 bit CPUs in the practical application.

In sum, power supply power-fail monitoring device and power down process method should have following function:

(1) can accurately monitor the power down phenomenon of importing power supply.

(2) has power supply capacity.The power supply of short time can be provided behind the power cut-off, and the little process chip in the sub-product of supplying power is accomplished the power down protection action.

(3) to the power down false triggering signal that is produced by power-supply fluctuation, the power down process method should have fault-tolerant ability, avoids occurring the state of similar " deadlock ".

Summary of the invention

The objective of the invention is to the said deficiency of background technology; A kind of device and power down process method with direct supply instantaneous power-down monitoring function is provided; This device is observation circuit plate power supply in real time; Power supply power-fail or shutdown the time provide power-off signal, behind the power cut-off, the power supply of short time can be provided for the little process chip in the electronic product and power down protection additional device; This power down process method is applicable to the electronic product that adopts little process chip, can in the short time of this device power supply, accomplish the power down protection action, and as preserving data, the Adjustment System duty is sent warning message, sends error message etc.

Technical scheme of the present invention is: a kind of direct supply down Monitor Unit device; Constitute by diode, the voltage comparison unit that is used for comparison external dc power voltage and output supply voltage, power storaging unit; External dc power is from converting out-put supply into behind diode; This out-put supply charges to power storaging unit, also to voltage comparison unit power supply is provided simultaneously; When the external dc power power down, power storaging unit continues to voltage comparison unit and peripheral circuit power supply, and it is characterized in that: diode stops the electric energy in the power storaging unit to flow out from external dc power.Beneficial effect is: utilize the unilateal conduction characteristic of diode, when the power supply operate as normal, external power source charges to power storaging unit through diode; When power supply power-fail, stop the electric energy in other peripheral components consumed power storage element in the electronic product, the power-on time that prolongs power storaging unit guarantees that little process chip has time enough to accomplish power supply power-fail protection action.

Aforesaid a kind of direct supply down Monitor Unit device is characterized in that: described voltage comparison unit is the voltage comparable chip with lagging characteristics.Beneficial effect is: because power supply just often, the voltage of diode input end is higher than the voltage of output terminal; During power supply power-fail, the voltage of diode input end is lower than the voltage of output terminal; Therefore the voltage comparable chip can obtain the power supply power-fail signal exactly.

Aforesaid a kind of direct supply down Monitor Unit device is characterized in that: said voltage comparison unit is through managing leg with the little process chip of power-off signal transmit outer.Its beneficial effect is to be convenient to system's control.

A kind of power supply power-fail disposal route is characterized in that:

Step 1, inspection supply voltage as are checked through power-off signal, then execution in step two programs;

Step 2, stop the current work of microprocessor, accomplish the work that to accomplish behind the power supply power-fail;

Step 3, call in and postpone the stand-by period, the maximum time that can continue supply power greater than external power source outage back power storaging unit said time delay;

Step 4, entering postpone wait routine, if postponing to run out of electric energy in the power storaging unit in the stand-by period, little process chip is with shutting down naturally; Be performed if postpone wait routine, can have judged that then last time, power-off signal was the false triggering that produces owing to the power supply irregular variation, this moment, program was got back to step 1.Its beneficial effect is: this power supply power-fail disposal route can be discerned the power-off signal with the correct handling false triggering, and anti-locking system gets into the state of similar deadlock.Electric energy in the consumed power storage element, the output voltage of reduction power storaging unit makes the microprocessor normal shutdown.

The invention has the beneficial effects as follows:

(1) the present invention has the power supply power-fail monitoring function, has energy storage function, can behind power supply power-fail, carry out the short time power supply, and simple in structure, cost is low, reliable operation.

(2) the present invention has utilized the unilateal conduction characteristic of diode, when power cut-off, has prolonged the power-on time of accumulate element in the device, makes little process chip have the enough time to carry out power down protection work, has improved the reliability of circuit power fail safeguard.

(3) the present invention is through detecting the size of diode voltage, can judge whether power down of power supply real-time and accurately, and this determination methods has good real-time performance and accuracy.

(4) the present invention can be installed in and need carry out in the electronic product on the circuit board of power down protection, and directly the direct supply of testing circuit plate does not need extra increase lead-in wire and increases power supply, and is easy to use.

(5) the power supply power-fail disposal route that provides of the present invention can be discerned the power-off signal with the correct handling false triggering, and anti-locking system gets into the state of similar deadlock, has fault tolerance preferably, has improved the reliability of system works.

Description of drawings

Accompanying drawing 1 is the structural relation figure between power supply power-fail monitoring device and other electron device;

Accompanying drawing 2 is the structure principle chart with device of power supply power-fail monitoring function;

Accompanying drawing 3 is the process flow diagram of power down process;

Accompanying drawing 4 is the circuit theory diagrams that a kind of power down data are preserved.

Embodiment

Mark in the accompanying drawing:

In the accompanying drawing 1,1-direct supply down Monitor Unit device, the little process chip of 2-, 3-power down process auxiliary circuit, the input of 4-power supply, the output of 5-power supply.

In the accompanying drawing 2,10-diode, 11-voltage comparison unit, 12-power storaging unit.

In the accompanying drawing 4, D1-diode, U0MAX485, U1-can clean storer X25045, C1-electrochemical capacitor, U2-single-chip microcomputer W78E516.

Below in conjunction with accompanying drawing and embodiment the present invention is further specified:

Shown in accompanying drawing 1; Structural relation figure between power supply power-fail monitoring device and other electron device; Power supply input 4 at first is input to direct supply down Monitor Unit device 1; Direct supply down Monitor Unit device 1 is given little process chip 2 and 3 power supplies of power down process auxiliary circuit through out-put supply 5; When power supply is imported 4 power down, give little process chip 2 by direct supply down Monitor Unit device 1 output power-off signal, continue as little process chip 2 and 3 power supplies of power down process auxiliary circuit by direct supply down Monitor Unit device 1 simultaneously; Little process chip 2 is moved with the power down process auxiliary circuit 3 common power down protections of accomplishing after receiving the power supply power-fail signal.

Shown in accompanying drawing 1, direct supply down Monitor Unit device 1 comprises three extension tube attached legs, input pipe leg A, efferent duct leg B and efferent duct leg C.Input pipe leg A is the input leg of external dc power, and efferent duct leg B is the output leg of direct supply, the power-off signal of efferent duct leg C output external dc power.

Shown in accompanying drawing 2, direct supply down Monitor Unit device 1 is made up of diode 10, voltage comparison unit 11, power storaging unit 12.External dc power is after pipe leg A input; Behind diode, convert the out-put supply of direct supply down Monitor Unit device 1 into; This out-put supply charges at the direct supply down Monitor Unit device 1 inner power storaging unit 11 of giving, and power supply is provided also for simultaneously voltage comparison unit 11; Out-put supply is by pipe leg B output, and the power supply after the output is given little process chip 2 and 3 power supplies of power down process auxiliary circuit among Fig. 1.

Further, when the external power source instantaneous power-down, direct supply down Monitor Unit device 1 inner power storaging unit 12 continues to builtin voltage comparing unit 11, little process chip 2 and 3 power supplies of power down process auxiliary circuit through pipe leg B; The function of diode 10 is to stop the electric energy in the power storaging unit 12 to flow out from pipe leg A, avoids the electric energy in other device consumed power storage element 12, prolongs the power-on time of power storaging unit 12.

Described voltage comparison unit 11, for employing has the voltage comparable chip of lagging characteristics, its input is the voltage at diode 10 two ends; During input power supply operate as normal, the input terminal voltage of diode is higher than the output end voltage of diode, and this moment, voltage comparison unit 11 was output as high level; During the input power supply power-fail; The input terminal voltage of diode descends fast; The output end voltage of diode is that the output voltage of power storaging unit 12 remains unchanged basically; Therefore the input terminal voltage of diode is lower than the output end voltage of diode, and this moment, the output of voltage comparison unit 11 was low level by jumping under the high level.The output signal of voltage comparison unit 11 is the power supply power-fail signal of direct supply down Monitor Unit device 1 output, and this signal wire is connected to little process chip 2 through pipe leg C.

The program circuit of power-off protection method is seen accompanying drawing 3 in little process chip 2; After little process chip receives the power supply power-fail signal; Program gets into the power supply power-fail handling procedure immediately, and program at first stops the current work of microprocessor, accomplishes the work that must accomplish behind the power supply power-fail then; Little process chip is called in earlier and is postponed the stand-by period, the maximum time that can continue supply power greater than external power source outage back power storaging unit time delay; Get into the latency delays program more then; If postponing in the stand-by period; Run out of electric energy in the power storaging unit, little process chip is with shutting down, if the latency delays program has been performed naturally; Can judge that then last time, power-off signal was the false triggering that produces owing to the power supply irregular variation, this moment, little process chip continued operate as normal.

Accompanying drawing 4 is preserved circuit embodiments for the power down data; Power storaging unit 11 adopts electric capacity (C1) in the present embodiment; Diode adopts 5819 (D1); Voltage comparison unit 11 adopts chip MAX485 (U0), and microprocessor chip 2 adopts single-chip microcomputer W78E516 (U2), and power down process auxiliary circuit 3 adopts scratch pad memory E2RomX25045 (U1).

Shown in accompanying drawing 4, the voltage range of electric capacity (C1) is the twice of single-chip microcomputer (U2) WV, appearance value and output voltage U i, single-chip microcomputer (U2) minimum U Min, the minimum power-on time T, the electric capacity (C1) that need output current I between the available following formula of relation describe.

C = I · T U i - U min

The output current of described capacitor C 1 is chip MAX485 (U0), single-chip microcomputer W78E516 (U2) and scratch pad memory E 2The working current sum of RomX25045 (U1).

For to have the voltage comparable chip of lagging characteristics, its WV is lower than the minimum of single-chip microcomputer W78E516 (U2) to described chip MAX485 (U0).Therefore from power supply power-fail to single-chip microcomputer W78E516 (U2) between the shutdown during this period of time in, can guarantee that chip MAX485 (U0) provides correct power-off signal.

Shown in accompanying drawing 4; The course of work that embodiment power down data are preserved circuit is following; After the A leg input of input supply voltage VCC by power supply power-fail monitoring device, at first receive the T+ leg of voltage comparable chip (U0), input supply voltage VCC gives external microcontroller (U2) and scratch pad memory (U1) power supply through diode after the B leg of power supply power-fail monitoring device is exported VDD; VDD is connected to electric capacity (C1) and gives this electric capacity charging simultaneously, and VDD is also connected to the T-leg of voltage comparable chip (U0) simultaneously.The external interrupt leg INT1 of single-chip microcomputer (U1) is received in the output of voltage comparable chip (U0) through the C leg output of power supply power-fail monitoring device.CS, SO, WP, SCK leg that the IO port P13 of single-chip microcomputer (U2), P14, P34, P35 are connected respectively to scratch pad memory (U1) are used to read, wipe and preserve the power down data.The leg RST that resets of single-chip microcomputer (U2) is connected to scratch pad memory (U1), and (U1) provides power-on reset signal for single-chip microcomputer (U2) by scratch pad memory.

When external power source VCC was in proper working order, the input terminal voltage VCC of diode must be higher than the output end voltage VDD of diode (D1), so voltage comparable chip (U0) is output as high level, i.e. power supply power-fail monitoring device C leg is input as high level.When external power source VCC power down; Because other device meeting lot of consumption electric energy on the circuit board; It descends the voltage of power supply VCC fast, and diode this moment (D1) can stop other device on the circuit board to consume the electric energy in the electric capacity (C1), so the decline rate of diode (D1) output end voltage VDD will be slower than the voltage of input power supply VCC; Therefore the voltage of out-put supply VDD will be higher than the voltage of input power supply VCC, and it is low level that the output of voltage comparable chip this moment (U0) will be jumped down by high level.Because the output of voltage comparable chip (U0) is connected to the external interrupt leg INT1 of single-chip microcomputer (U2), it is the external interrupt that low level will trigger single-chip microcomputer (U2) that the output of voltage comparable chip (U0) is jumped down by high level, makes program get into interrupt routine.

After single-chip microcomputer (U2) gets into interrupt routine; At first stop current action, then IO port P13, P14, P34, the P35 of current significant data through single-chip microcomputer (U2) is saved in the scratch pad memory (U1), after the completion data are preserved; Program gets into 100ms and postpones wait routine; Electric energy in the 100ms time behind the power supply power-fail in the electric capacity will run out of, so 100ms postpones wait routine and be not performed, and single-chip microcomputer will shut down because supply voltage crosses low; If postponing wait routine, 100ms has been performed; Then explanation this moment, supply voltage was normal, and therefore last time power-off signal is the false triggering signal, got back to master routine and continued operation so program will withdraw from the power-fail interrupt program.

Claims (4)

1. direct supply down Monitor Unit device; Constitute by diode, the voltage comparison unit that is used for comparison external dc power voltage and output supply voltage, power storaging unit; External dc power is from converting out-put supply into behind diode; This out-put supply charges to power storaging unit, also to voltage comparison unit power supply is provided simultaneously; When the external dc power power down, power storaging unit continues to voltage comparison unit and peripheral circuit power supply, and it is characterized in that: diode stops the electric energy in the power storaging unit to flow out from external dc power.
2. direct supply down Monitor Unit device as claimed in claim 1 is characterized in that: described voltage comparison unit adopts has the voltage comparable chip of lagging characteristics.
3. according to claim 1 or claim 2 direct supply down Monitor Unit device is characterized in that: said voltage comparison unit through the pipe leg with the little process chip of power-off signal transmit outer.
4. power supply power-fail disposal route is characterized in that:
Step 1, inspection supply voltage as are checked through power-off signal, then execution in step two programs;
Step 2, stop the current work of microprocessor, accomplish the work that to accomplish behind the power supply power-fail;
Step 3, call in and postpone the stand-by period, the maximum time that can continue supply power greater than external power source outage back power storaging unit said time delay;
Step 4, entering postpone wait routine, if postponing to run out of electric energy in the power storaging unit in the stand-by period, little process chip is with shutting down naturally; Be performed if postpone wait routine, can have judged that then last time, power-off signal was the false triggering that produces owing to the power supply irregular variation, this moment, program was got back to step 1.
CN2012100417612A 2012-02-23 2012-02-23 Instantaneous power-down monitoring device and power-down processing method for DC power supply CN102590588A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN2012100417612A CN102590588A (en) 2012-02-23 2012-02-23 Instantaneous power-down monitoring device and power-down processing method for DC power supply

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN2012100417612A CN102590588A (en) 2012-02-23 2012-02-23 Instantaneous power-down monitoring device and power-down processing method for DC power supply

Publications (1)

Publication Number Publication Date
CN102590588A true CN102590588A (en) 2012-07-18

Family

ID=46479512

Family Applications (1)

Application Number Title Priority Date Filing Date
CN2012100417612A CN102590588A (en) 2012-02-23 2012-02-23 Instantaneous power-down monitoring device and power-down processing method for DC power supply

Country Status (1)

Country Link
CN (1) CN102590588A (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104377806A (en) * 2014-11-13 2015-02-25 深圳市汇川控制技术有限公司 Power-down control circuit and method
CN104749423A (en) * 2013-12-31 2015-07-01 东莞钜威新能源有限公司 Power failure detection circuit for direct current power supply
CN105137227A (en) * 2015-08-03 2015-12-09 昆腾微电子股份有限公司 Testing device and method for power-down protection of intelligent card
CN105739657A (en) * 2016-02-02 2016-07-06 西安诺瓦电子科技有限公司 Circuit structure applied to embedded system
CN105785168A (en) * 2016-03-03 2016-07-20 深圳市共进电子股份有限公司 Detection circuit and automatic detection device
WO2016206263A1 (en) * 2015-06-25 2016-12-29 上海斐讯数据通信技术有限公司 System and method of preventing data corruption during power-on/power-off of spi flash
CN108931756A (en) * 2018-06-12 2018-12-04 宁波三星智能电气有限公司 A kind of electric energy meter power failure detection method
CN109188122A (en) * 2018-08-11 2019-01-11 武汉盛硕电子有限公司 A kind of power-failure memory method for charging pile

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2239747A (en) * 1990-01-02 1991-07-10 Gotec Research And Dev Ltd Data protection device
CN2119692U (en) * 1992-02-27 1992-10-21 沈文炯 Multifunctional intelligent alarm with electronic clock
CN2682506Y (en) * 2004-03-17 2005-03-02 海信集团有限公司 Tax-control cashing machine with novel power supply monitoring module
CN200962514Y (en) * 2006-10-25 2007-10-17 深圳桑达国际电子器件有限公司 Electricity drop detection device
WO2010139385A2 (en) * 2009-06-03 2010-12-09 Atreus Enterprises Limited A mains power failure indicator
CN202522610U (en) * 2012-02-23 2012-11-07 海军工程大学 Direct current power supply power failure monitoring device

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2239747A (en) * 1990-01-02 1991-07-10 Gotec Research And Dev Ltd Data protection device
CN2119692U (en) * 1992-02-27 1992-10-21 沈文炯 Multifunctional intelligent alarm with electronic clock
CN2682506Y (en) * 2004-03-17 2005-03-02 海信集团有限公司 Tax-control cashing machine with novel power supply monitoring module
CN200962514Y (en) * 2006-10-25 2007-10-17 深圳桑达国际电子器件有限公司 Electricity drop detection device
WO2010139385A2 (en) * 2009-06-03 2010-12-09 Atreus Enterprises Limited A mains power failure indicator
CN202522610U (en) * 2012-02-23 2012-11-07 海军工程大学 Direct current power supply power failure monitoring device

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
季瑞松等: "单片机应用系统数据掉电保护技术", 《电工技术杂志》 *

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104749423A (en) * 2013-12-31 2015-07-01 东莞钜威新能源有限公司 Power failure detection circuit for direct current power supply
CN104377806A (en) * 2014-11-13 2015-02-25 深圳市汇川控制技术有限公司 Power-down control circuit and method
WO2016206263A1 (en) * 2015-06-25 2016-12-29 上海斐讯数据通信技术有限公司 System and method of preventing data corruption during power-on/power-off of spi flash
CN105137227A (en) * 2015-08-03 2015-12-09 昆腾微电子股份有限公司 Testing device and method for power-down protection of intelligent card
CN105739657A (en) * 2016-02-02 2016-07-06 西安诺瓦电子科技有限公司 Circuit structure applied to embedded system
CN105785168A (en) * 2016-03-03 2016-07-20 深圳市共进电子股份有限公司 Detection circuit and automatic detection device
CN105785168B (en) * 2016-03-03 2019-03-01 深圳市共进电子股份有限公司 Detection circuit and automatic detection device
CN108931756A (en) * 2018-06-12 2018-12-04 宁波三星智能电气有限公司 A kind of electric energy meter power failure detection method
CN109188122A (en) * 2018-08-11 2019-01-11 武汉盛硕电子有限公司 A kind of power-failure memory method for charging pile

Similar Documents

Publication Publication Date Title
TW521513B (en) Asynchronous low power mode bus controller circuit and method of low power mode operation
CN101841187B (en) Power management power supply system for electronic electric energy meter
CN103107707B (en) Resonant converting circuit and resonant controller
CN102708031B (en) A kind of method of quick location failure memory
EP1783887A1 (en) A control device for a power supply with zero power consumption in standby mode
US20110016340A1 (en) Computer power backup system and device
CN103984610B (en) FPGA (Field Programmable Gate Array) based power failure protection system and method
CN102496907B (en) Set top box, power fail safeguard device and power fail data protection method
TWI475368B (en) Power control system and method thereof
JP3150567U (en) Electronic device that reduces power consumption when computer motherboard shuts down
WO2008143980A3 (en) Dynamic processor power management device and method thereof
CN102163071B (en) Control circuit and power control method during reset thereof
CN101216788B (en) Reset control chip and method
US8527788B2 (en) Network wake up system with protection function
CN103105915B (en) A kind of repositioning method of intelligent terminal and system
CN201867678U (en) Mainboard of computer capable of reducing power consumption during sleep
CN102707121B (en) Voltage surge detection circuit
CN1780348B (en) Power supply controlling method and system for telecommunication system
WO2005071531A1 (en) A method and device for start up computer
CN103676746A (en) Control circuit of startup and shutdown machine and electronic equipment
CN204360323U (en) For enabling the control circuit of the connection of primary power, computing system and device
CN205229961U (en) Anti breech lock power -off reset circuit of CMOS singlechip
CN102680779B (en) The self-adaptation control method of a kind of three-phase electric energy meter and three-phase electric energy meter
CN102882267B (en) Power supply device, electronic equipment and power supply method
CN104834369A (en) Power failure data protection device of real-time control system

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
C12 Rejection of a patent application after its publication
RJ01 Rejection of invention patent application after publication

Application publication date: 20120718