WO2001095335A1 - Dispositif de sauvegarde de donnees et alimentation electrique possedant une fonction d'elevation et d'abaissement de tension - Google Patents
Dispositif de sauvegarde de donnees et alimentation electrique possedant une fonction d'elevation et d'abaissement de tension Download PDFInfo
- Publication number
- WO2001095335A1 WO2001095335A1 PCT/JP2000/003732 JP0003732W WO0195335A1 WO 2001095335 A1 WO2001095335 A1 WO 2001095335A1 JP 0003732 W JP0003732 W JP 0003732W WO 0195335 A1 WO0195335 A1 WO 0195335A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- power supply
- voltage
- backup
- main power
- dynamic ram
- Prior art date
Links
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11C—STATIC STORES
- G11C11/00—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor
- G11C11/21—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor using electric elements
- G11C11/34—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor using electric elements using semiconductor devices
- G11C11/40—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor using electric elements using semiconductor devices using transistors
- G11C11/401—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor using electric elements using semiconductor devices using transistors forming cells needing refreshing or charge regeneration, i.e. dynamic cells
- G11C11/4063—Auxiliary circuits, e.g. for addressing, decoding, driving, writing, sensing or timing
- G11C11/407—Auxiliary circuits, e.g. for addressing, decoding, driving, writing, sensing or timing for memory cells of the field-effect type
- G11C11/4074—Power supply or voltage generation circuits, e.g. bias voltage generators, substrate voltage generators, back-up power, power control circuits
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11C—STATIC STORES
- G11C11/00—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor
- G11C11/21—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor using electric elements
- G11C11/34—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor using electric elements using semiconductor devices
- G11C11/40—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor using electric elements using semiconductor devices using transistors
- G11C11/401—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor using electric elements using semiconductor devices using transistors forming cells needing refreshing or charge regeneration, i.e. dynamic cells
- G11C11/406—Management or control of the refreshing or charge-regeneration cycles
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11C—STATIC STORES
- G11C5/00—Details of stores covered by group G11C11/00
- G11C5/14—Power supply arrangements, e.g. power down, chip selection or deselection, layout of wirings or power grids, or multiple supply levels
- G11C5/141—Battery and back-up supplies
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11C—STATIC STORES
- G11C5/00—Details of stores covered by group G11C11/00
- G11C5/14—Power supply arrangements, e.g. power down, chip selection or deselection, layout of wirings or power grids, or multiple supply levels
- G11C5/147—Voltage reference generators, voltage or current regulators; Internally lowered supply levels; Compensation for voltage drops
Definitions
- the present invention relates to a data backup device that controls power supplied to a memory to backup data, and a step-up / step-down power supply that supplies power to a vehicle-mounted device such as a power navigation device. is there.
- Background art
- a conventional data backup device is equipped with a SRM ⁇ rewritable R0M, and stores data of a vehicle-mounted device such as a car navigation device in the SRAM or the like.
- the conventional data backup device Since the conventional data backup device is configured as described above, it is necessary to read a large amount of data such as peripheral map information from an external storage device at the time of starting the vehicle-mounted device. Therefore, there is a problem that it takes a long time for the in-vehicle device to actually start operating. If a large-capacity SRAM is mounted on an in-vehicle device, it is not necessary to read a large amount of data from an external storage device when the in-vehicle device is started, but the SRAM has a small amount of information per area and is expensive. Therefore, it is not practical to install large-capacity SRAM in in-vehicle equipment.
- the present invention has been made to solve the above-described problems, and has as its object to provide a data backup device capable of storing a large amount of data inside a vehicle-mounted device.
- the present invention provides a step-up / step-down power supply that can output a predetermined voltage to a vehicle-mounted device and stably operate the vehicle-mounted device even when a voltage input from a main power supply such as a vehicle-mounted battery fluctuates. The purpose is to obtain. Disclosure of the invention
- the detection means detects a main power OFF command
- the dynamic RAM is changed to a self-refresh mode, and power is supplied from the backup power supply to the dynamic RAM.
- This is provided with a control means for performing the control.
- the data backup device is configured to supply power from the main power supply to the dynamic RAM until the change of the self-refresh mode is completed after the command to turn off the main power supply is detected. There is an effect that the data of the in-vehicle device can be surely stored.
- a data backup device is configured such that a memory area to be supplied with power by a backup power supply is set from a plurality of memory areas constituting a dynamic RAM, and power is supplied only to the memory area. It was done.
- a data backup device discloses information indicating a memory area to be supplied with power by a nocturnal power source, thereby confirming that the previous termination was normally performed. In addition, it is possible to confirm that a normal backup was performed during shutdown, and also to check for unexpected memory loss due to a drop in backup power during backup, etc. There is.
- the control unit and the SDRAM are separated until the initial setting of the control means is completed.
- the step-up / step-down power supply according to the present invention is provided with a step-up DC / DC converter that boosts the input voltage and outputs a predetermined voltage when the voltage input from the main power supply falls below the reference voltage.
- the predetermined voltage can be output to the in-vehicle device, so that the in-vehicle device can be operated stably.
- a step-up / step-down power supply according to the present invention provides a voltage signal from an output stage that outputs a predetermined voltage.
- the switching element of the DC / DC converter is driven by taking in the signal.
- FIG. 1 is a configuration diagram showing a data backup device according to Embodiment 1 of the present invention.
- FIG. 2 is a configuration diagram showing a buck-boost power supply according to Embodiment 2 of the present invention.
- FIG. 3 is an explanatory diagram showing a power supply detection sequence.
- FIG. 1 is a block diagram showing a data backup device according to Embodiment 1 of the present invention.
- reference numeral 1 denotes a DRAM which stores data of a vehicle-mounted device such as a power navigation device. (Dynamic: RAM), and the DRAM is composed of a plurality of memory areas A to C.
- 2 is a battery (main power supply) mounted on the vehicle
- 3 is a step-up / step-down power supply that receives an output voltage of the battery 2 and outputs a predetermined voltage even if the output voltage fluctuates
- 4 is a backup power supply.
- Reference numeral 5 denotes a power detection unit (detection means) for detecting an ON command or an OFF command of the battery 2, and 6 denotes initialization of the CPU 7 when the power detection unit 5 detects an ON command.
- Reset circuit 7 is a CPU that changes DRAM 1 to self-refresh mode when the power supply detector 5 detects an OFF command
- 8 is a power supply for DRAM 1 when DRAM 1 shifts to self-refresh mode.
- the control unit switches the power from the buck-boost power supply 3 to the backup power supply 4.
- the control means is composed of the CPU 7, the control unit 8, and the selectors 9 to 14.
- the power supply detection unit 5 detects a power-off command and notifies the CPU 7 of that.
- the CPU 7 When the CPU 7 receives the OFF command from the power detection unit 5, the CPU 7 changes the DRAM 1 to the self-refresh mode in order to prevent the loss of the data stored in the DRAM 1.
- DRAM 1 automatically repeats the data writing mode (self-refresh mode).
- DRAM 1 is SDRAM '
- the external mode is accepted when the CKE pin is "H”
- the previous mode is retained when the CKE pin is "L”.
- the control unit 8 switches the power supply source of the DRAM 1 from the buck-boost power supply 3 to the backup power supply 4 when the DRAM 1 shifts to the self-refresh mode.
- the DRAM 1 is supplied with power from the backup power supply 4, so that it is possible to maintain the power consumption.
- the power supply detecting unit 5 detects the power-on command and notifies the reset circuit 6 of the detection.
- the reset circuit 6 When the reset circuit 6 receives an ON command from the power detection unit 5, the reset circuit 6 initializes the CPU 7, and releases the self-refresh mode.
- the control unit 8 disconnects the CPU 7 from the DRAM 1 during the initialization of the CPU 7 to prevent the destruction of the data stored in the DRAM 1 and the like when the CPU 7 is initialized. Connect CPU 7 and DRAM 1, and switch the power supply of DRAM 1 from backup power supply 4 to buck-boost power supply 3.
- the power supply detecting unit 5 detects the command to turn off the battery 2
- the DRAM 1 is changed to the self-refresh mode, and the DRAM 1 is switched from the backup power supply 4 to the DRAM 1. Since it is configured to supply power to the DRAM, a large amount of data can be stored in the DRAM 1 that is inexpensive and has a large capacity. Therefore, for example, if the in-vehicle device is a navigation device, not only the current location information but also the surrounding map information and additional information can be backed up. There is an effect of being able to be used.
- FIG. 2 is a configuration diagram showing a buck-boost power supply according to Embodiment 2 of the present invention.
- reference numeral 21 denotes a reference wave generation circuit
- reference numeral 22 denotes a step-up DC that boosts the input voltage V IN and outputs a predetermined voltage V 1 when the voltage V IN input from the battery 2 falls below the reference voltage.
- the DC / DC converter 23 is connected in series with the DC / DC converter 22.
- the input voltage N is reduced to the predetermined voltage.
- V This is a step-down DC / DC converter that outputs UT . '
- the step-up / step-down power supply 3 is provided to ensure that the operable voltages of the CPU 7 and the DRAM 1 can be maintained even if the output voltage of the battery 2 decreases due to the cranking operation.
- the step-up / step-down power supply 3 steps up the input voltage V IN and outputs a predetermined voltage V 1. and / DC comparator Isseki 2 2, Roh Uz the voltage V iN input from te Li 2 rises above the reference voltage, Sutedzupudaun DC / DC converter for outputting a predetermined voltage V 0 UT steps down the input voltage V i N 23.
- the step-up DC / DC converter 22 hardly operates in the operating voltage range of the step-down DC / DC converter 23, and the step-down DC / DC converter 23 operates in the step-up DC / DC converter 22. It is designed to hardly operate in the operating voltage range. Thus, the conversion efficiency can be improved by operating each converter individually.
- the control circuit 22a of the step-up DC / DC converter 22 takes in a voltage signal from the output stage X that outputs the predetermined voltage V1, and Since S—FET 22b is driven, even if the voltage V IN input from battery 2 drops below the operable voltage of MOS—FET 22b, As a result, an appropriate operable voltage can be secured, so that the step-up operation can be continued.
- a fly-bag type converter that uses a transformer as a step-up / step-down power supply that outputs a predetermined voltage has existed in the past, but a fly-bag type converter can convert the input voltage.
- Power is determined by the capacity of the transformer. In equipment with a limited area, such as in-vehicle equipment, the size of the transformer was a bottleneck, making it difficult to construct a large-capacity buck-boost power supply.
- the step-up / step-down power supply 3 in FIG. 2 uses a choke coil instead of a transformer, so that the mounting area for the power supply capacity can be designed to be small.
- the step of increasing the input voltage V IN to output the predetermined voltage V 1 Up D CZD C converter 22 is provided, so that even if the output voltage of battery 2 drops due to cranking operation, etc., the default voltage can be output to the vehicle equipment.
- the in-vehicle device can be operated stably. Therefore, it is possible to prevent the navigation device and the like from being reset when the engine is started, so that the present invention can be applied to an idling top car.
- the power supply of the DRAM 1 is switched from the buck-boost power supply 3 to the backup power supply 4.
- the memory area to which power is to be supplied by the backup power supply 4 is set (for example, memory area A stores data, but memory area B, If no data is stored in C, the selectors 9 and 10 are controlled to set only the memory area A as a power supply target.)
- the control unit 8 supplies power only to the memory area to be supplied with power. May be supplied.
- the memory area to be supplied with power by the backup power supply 4 is set and power is supplied to only some memory areas.
- the memory area to be supplied with power by the backup power supply 4 is A backup confirmation mechanism for disclosing information to be shown on the memory map of the CPU 7 may be provided.
- the buck-boost power supply 3 is provided so that the operable voltage of the CPU 7 and the DRAM 1 can be secured even if the output voltage of the battery and the battery 2 decrease due to the cranking operation.
- the output voltage of battery 2 decreases, power supply from battery 2 to some devices may be stopped.
- the data backup device backs up a large amount of data by appropriately supplying power to a large-capacity dynamic RAM mounted on a vehicle-mounted device. Suitable to do.
- the step-up / step-down power supply according to the present invention outputs a predetermined voltage to a vehicle-mounted device even when a voltage input from a main power supply such as a battery fluctuates, and stably operates the vehicle-mounted device.
- a main power supply such as a battery fluctuates
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP00935591A EP1293985B1 (en) | 2000-06-08 | 2000-06-08 | Data backup device and step-up/step-down power supply |
US10/031,118 US6731563B1 (en) | 2000-06-08 | 2000-06-08 | Data backup device and step-up/step-down power supply |
DE60036026T DE60036026T2 (de) | 2000-06-08 | 2000-06-08 | Datenspeichervorrichtung und energieversorgung mit möglichkeit zur spannungserhöhung oder verminderung |
PCT/JP2000/003732 WO2001095335A1 (fr) | 2000-06-08 | 2000-06-08 | Dispositif de sauvegarde de donnees et alimentation electrique possedant une fonction d'elevation et d'abaissement de tension |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/JP2000/003732 WO2001095335A1 (fr) | 2000-06-08 | 2000-06-08 | Dispositif de sauvegarde de donnees et alimentation electrique possedant une fonction d'elevation et d'abaissement de tension |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2001095335A1 true WO2001095335A1 (fr) | 2001-12-13 |
Family
ID=11736130
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2000/003732 WO2001095335A1 (fr) | 2000-06-08 | 2000-06-08 | Dispositif de sauvegarde de donnees et alimentation electrique possedant une fonction d'elevation et d'abaissement de tension |
Country Status (4)
Country | Link |
---|---|
US (1) | US6731563B1 (ja) |
EP (1) | EP1293985B1 (ja) |
DE (1) | DE60036026T2 (ja) |
WO (1) | WO2001095335A1 (ja) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2007219954A (ja) * | 2006-02-17 | 2007-08-30 | Murata Mach Ltd | メモリシステムの制御方法 |
JP2010233380A (ja) * | 2009-03-27 | 2010-10-14 | Seiko Epson Corp | 電源供給回路及び電子デバイス |
US8572422B2 (en) | 2009-09-01 | 2013-10-29 | Nec Corporation | Disk array apparatus including insertion/extraction detection function of the connector |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
TW591393B (en) * | 2003-01-22 | 2004-06-11 | Fujitsu Ltd | Memory controller |
US7493441B2 (en) * | 2005-03-15 | 2009-02-17 | Dot Hill Systems Corporation | Mass storage controller with apparatus and method for extending battery backup time by selectively providing battery power to volatile memory banks not storing critical data |
JP2011059937A (ja) * | 2009-09-09 | 2011-03-24 | Seiko Epson Corp | 電子機器 |
US10191681B2 (en) * | 2014-10-31 | 2019-01-29 | Hewlett Packard Enterprise Development Lp | Shared backup power self-refresh mode |
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- 2000-06-08 WO PCT/JP2000/003732 patent/WO2001095335A1/ja active IP Right Grant
- 2000-06-08 US US10/031,118 patent/US6731563B1/en not_active Expired - Lifetime
- 2000-06-08 DE DE60036026T patent/DE60036026T2/de not_active Expired - Lifetime
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Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
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JP2007219954A (ja) * | 2006-02-17 | 2007-08-30 | Murata Mach Ltd | メモリシステムの制御方法 |
JP4501868B2 (ja) * | 2006-02-17 | 2010-07-14 | 村田機械株式会社 | メモリシステムの制御方法 |
JP2010233380A (ja) * | 2009-03-27 | 2010-10-14 | Seiko Epson Corp | 電源供給回路及び電子デバイス |
US8572422B2 (en) | 2009-09-01 | 2013-10-29 | Nec Corporation | Disk array apparatus including insertion/extraction detection function of the connector |
Also Published As
Publication number | Publication date |
---|---|
EP1293985B1 (en) | 2007-08-15 |
US6731563B1 (en) | 2004-05-04 |
DE60036026T2 (de) | 2008-04-30 |
DE60036026D1 (de) | 2007-09-27 |
EP1293985A1 (en) | 2003-03-19 |
EP1293985A4 (en) | 2005-11-02 |
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