CN201160226Y - Selective back-up power supply device - Google Patents

Abstract

The utility model relates to a selective back-up power supply device is applicable to in the palm type computer (Pocket PC), and the power supply uses with the memory cell for real-time clock, and it is including backup battery, first power output unit and second power output unit. Wherein the backup battery outputs a backup voltage. The first power output unit is connected to the backup battery and the real-time clock, receives the backup voltage and outputs a first supply voltage to the real-time clock. The second power output unit is connected with the backup battery and the storage unit, receives the backup voltage, and outputs a second supply voltage to the storage unit or stops outputting the second supply voltage according to the selection signal. The utility model discloses be used for providing the palm type computer under the condition of low power supply, carry out the selection of two kinds of power management means of standard mode and high-quality mode.

Description

Selective backup power supply unit

technical field

The utility model relates to a selective backup power supply device, in particular to a power supply device which is suitable for a Pocket PC and can provide suitable power for loads according to the selection of the power supply mode.

Background technique

Generally, when a Pocket PC is in a low power supply (Low Battery), its power management usually adopts a Standard Mode or a Premium Mode to manage the power of the Pocket PC. In the standard mode (Standard Mode), when the main battery (Pocket PC) is exhausted or removed, the status data generated by the handheld computer is automatically stored in the memory, and the backup battery will provide power to the memory and real-time clock (Real Time Clock; RTC) at least 30 minutes to maintain data and time. In addition, in the premium mode (Premium Mode), the backup battery only provides power to the real-time clock (RTC) to keep the date and time of the handheld computer for about 168 hours.

Please refer to FIG. 1 , which is a schematic block diagram of a power supply device for a conventional palmtop computer. The power supply device 1 includes a main battery 14 , a charging unit 19 , a backup battery 18 , and a power output unit 16 . When the palmtop computer is powered normally, the main battery 14 provides voltage for the real-time clock 2 and the storage unit 3 in the palmtop computer. Meanwhile, the backup battery 18 is also charged by the charging unit 19 . The aforementioned storage unit 3 is usually a synchronous dynamic random access memory (SDRAM).

Referring to FIG. 1 again, the structure of the power supply device 1 can only be used under the standard mode (StandardMode) management method, wherein, when the main battery 14 is exhausted or removed, the palmtop computer will be powered by the backup battery 18 instead. At this time, the backup battery 18 sends a backup voltage to the power output unit 16 so that the power output unit 16 can generate a supply voltage for the real-time clock 2 and the storage unit 3 to use. And, the document data that palmtop computer produces can be automatically stored in storage unit 3, and the electric power that backup battery 18 provides will keep the integrity of aforementioned document data, and aforementioned document data comprises the data of editing, the program in use and Other settings, etc. Simultaneously, real-time clock 2 also will keep the state such as date, time of palmtop computer.

However, the backup battery 18 needs to supply power to the real-time clock 2 and the storage unit 3 at the same time, so its power can only last for about 30 minutes to 90 minutes, and after the power is exhausted, the document data stored in the storage unit 3 will be will disappear.

To sum up, the structure of the traditional power supply device 1 can only provide power for the palmtop computer under low power supply through the standard mode (Standard Mode) management method. Therefore, this structure is limited to the standard mode (Standard Mode), and cannot provide long-term power to maintain the operation of the storage unit 3 and the real-time clock 2 . At the same time, it is also unable to provide users with a flexible choice of power management means for Standard Mode or Premium Mode.

Utility model content

In view of this, the utility model provides a selective backup power supply device, which is used in a palmtop computer (Pocket PC), and provides a standard mode ( Standard Mode) or Premium Mode (Premium Mode) two power management options.

The selective backup power supply device of the utility model supplies power to the real-time clock and the storage unit, which includes a backup battery, a first power output unit and a second power output unit. Wherein, the backup battery outputs a backup voltage. The first power output unit is connected to the backup battery and the real-time clock, receives the backup voltage and outputs a first supply voltage to the real-time clock. The second power output unit is connected to the backup battery and the storage unit, receives the backup voltage, and outputs a second supply voltage to the storage unit or stops outputting the second supply voltage according to a selection signal.

The optional backup power supply device described above further includes a charging unit connected to the backup battery, and the charging unit outputs a charging voltage to charge the backup battery.

The above selective backup power supply device further includes a main battery connected to the storage unit and the charging unit, the main battery outputs a first main voltage to the storage unit and a second main voltage to the charging unit.

In the selective backup power supply device described above, the charging unit includes: a step-down circuit, connected to the main battery, used to lower the second main voltage to generate the charging voltage; and a current limiting circuit, connected to the main battery Step-down circuit to limit the size of the charging current.

The selective backup power supply device described above further includes a voltage clamping element connected to the main battery and the first power output unit, and the voltage clamping element clamps the first supply voltage.

As mentioned above in the selective backup power supply device, the voltage clamping element is a Zener diode.

According to the selective backup power supply device described above, the first power output unit prevents the backup voltage from being over-discharged and generates the first supply voltage.

According to the selective backup power supply device described above, the second power output unit prevents the backup voltage from being over-discharged and generates the second supply voltage.

According to the selective backup power supply device mentioned above, the storage unit is a synchronous dynamic random access memory.

According to the foregoing, the utility model can output the second supply voltage to the storage unit according to the selection signal when the palmtop computer is in the low power supply (Low Battery), and use the standard mode (Standard Mode) as the selection of the power management means, Alternatively, the output of the second supply voltage is stopped according to the selection signal, and the Premium Mode is selected as the power management means. Therefore, the utility model is used to provide the handheld computer with a choice of two power management methods, Standard Mode and Premium Mode, in the case of Low Battery.

Description of drawings

FIG. 1 is a schematic block diagram of a power supply device for a conventional palmtop computer; and

FIG. 2 is a schematic circuit block diagram of the selective backup power supply device of the present invention.

And, each reference numeral in the above-mentioned drawings is explained as follows:

known:

1 power supply device

2 real time clock

3 storage units

14 main battery

16 Power output unit

18 backup battery

19 charging unit

The utility model:

2 real time clock

3 storage units

4 Selective backup power supply device

40 main battery

42 The first power output unit

44 Second power output unit

46 backup battery

48 charging unit

480 current limit circuit

482 Buck circuit

49 voltage clamping element

Vb backup voltage

Vc charging voltage

V1 first supply voltage

V2 Second supply voltage

V3 The first main voltage

V4 Second main voltage

S1 selection signal

Detailed ways

Please refer to FIG. 2 , which is a schematic circuit block diagram of the selective backup power supply device of the present invention. The optional backup power supply device 4 is suitable for a Pocket PC, connected to the real-time clock 2 and the storage unit 3, and can supply power to the real-time clock 2 and the storage unit 3 according to the selection signal S1. Wherein, the storage unit 3 may be a synchronous dynamic random access memory (SDRAM).

The selective backup power supply device 4 of the present invention mainly includes a backup battery 46 , a first power output unit 42 and a second power output unit 44 . Wherein, the backup battery 46 is used to output the backup voltage Vb. The first power output unit 42 is connected to the backup battery 46 and the real-time clock 2 , receives the backup voltage Vb, and outputs the first supply voltage V1 for the real-time clock 2 to use. The second power output unit 44 is connected to the backup battery 46 and the storage unit 3 , receives the backup voltage Vb, and outputs the second supply voltage V2 to the storage unit 3 or stops outputting the second supply voltage V2 according to the selection signal S1 .

In addition, the first power output unit 42 provides an over-discharge protection function to prevent the backup voltage Vb from over-discharging the first power output unit 42, and also provides a power generation function to generate the first supply voltage according to the backup voltage Vb. V1. Similarly, the second power output unit 44 also provides an over-discharge protection function to prevent the backup voltage Vb from being over-discharged, and also provides a power generation function to generate the second supply voltage V2 according to the backup voltage Vb.

Referring to Fig. 2 again, the optional backup power supply device 4 of the present invention also includes a charging unit 48 and a main battery 40, the charging unit 48 is connected to the backup battery 46 and the main battery 40, and receives the second main voltage V4 from the main battery 40, And output the charging voltage Vc to charge the backup battery 46 . In addition, the main battery 40 is also connected to the storage unit 3 and outputs the first main voltage V3 to the storage unit 3 . The charging unit 48 has a step-down circuit 482 and a current limiting circuit 480 , wherein the step-down circuit 482 is connected to the main battery 40 for stepping down the second main voltage V4 to generate a charging voltage Vc. The current limiting circuit is connected to the step-down circuit 482 to limit the magnitude of the charging current.

Referring to FIG. 2 again, the selective backup power supply device 4 further includes a voltage clamping element 49 connected to the main battery 40 and the first power output unit 42 for clamping the output of the first supply voltage V1. Wherein, the voltage clamping element 49 can be a Zener diode. When the palmtop computer is turned on normally, the main battery 40 will supply power to the storage unit 3 and the real-time clock 2 through the voltage clamping element 49 . Meanwhile, the main battery 40 will charge the backup battery 46 through the charging unit 48 . Until the main battery 40 is in a low power state, the real-time clock 2 will obtain the first supply voltage V1 from the first power output unit 42 to maintain the operation. At this time, the voltage clamping element 49 will be used to clamp the first supply voltage V1 to Provide a stable power supply for the use of the real-time clock 2.

Referring to FIG. 2 again, the second power output unit 44 can output the second supply voltage V2 to the storage unit 3 according to the selection signal S1, and use the standard mode as the power management option. Alternatively, the second power output unit 44 stops outputting the second supply voltage V2 to the storage unit 3 according to the selection signal S1, and uses the Premium Mode as a power management option.

Referring to Fig. 2 again, the user can set the selection signal S1 as a high potential "HIGH", at this time, the optional backup power supply device 4 of the present utility model will work under the management of the standard mode (StandardMode). When the optional backup power supply device 4 of the present utility model works under the management of the standard mode (Standard Mode), if the main battery of the palmtop computer is exhausted, the backup battery 46 will start. The activated backup battery 46 sends a backup voltage Vb to the first power output unit 42 and the second power output unit 44 , and then supplies power to the real-time clock 2 and the storage unit 3 at the same time.

In addition, when the system detects that the capacity of the main battery 40 is lower than the preset value, a low battery (Low Battery) warning will be issued immediately, and the system will be forced into a standby mode (suspend). At this time, the main battery 40 reserves a certain capacity to supply the storage unit 3 for about 72 hours. At the same time, the user can replace the main battery 40 or charge the main battery 40 within 72 hours after the system enters the standby state (the replacement time will be within about 30 minutes after the backup battery 46 is exhausted).

After replacing the main battery 40 or after the main battery 40 is fully charged, the user restarts the power button to return to the same situation before entering the forced standby state. This is because the storage unit 3 is powered continuously.

Under the management of the standard mode (Standard Mode), the backup battery 46 needs to supply power to the real-time clock 2, and cooperates with the main battery 40 to supply power to the storage unit 3. Therefore, the power supplied can only allow the real-time clock 2 and storage Unit 3 is maintained for approximately 30 to 90 minutes. During this maintenance time, the document data produced by the palm computer will be stored in the storage unit 3. The aforementioned document data includes edited data, programs in use, and other set values. Simultaneously, the real-time clock 2 will also Keep the date, time, etc. status of your handheld. In the foregoing, because the storage unit 3 is a synchronous dynamic random access memory (SDRAM), the file data stored in the storage unit 3 will disappear after the power of the main battery 40 and the backup battery 46 are exhausted.

Referring to FIG. 2 again, the user can set the selection signal S1 to a low potential "LOW", at this time, the optional backup power supply device 4 of the present invention will work under the management of the premium mode (Premium Mode). When the optional backup power supply device 4 of the present utility model works under the management of the premium mode (Premium Mode), if the main battery of the palmtop computer is exhausted, the backup battery 46 will start.

The activated backup battery 46 sends a backup voltage Vb to the first power output unit 42 , and then supplies power to the real-time clock 2 for use. In the premium mode (Premium Mode), the second power output unit 44 stops outputting the second supply voltage V2 to the storage unit 3. Therefore, under the high-quality mode (Premium Mode), the backup battery 46 only needs to provide power for the real-time clock 2 to use, so the date, time and other states of the palmtop computer can be kept for about 168 hours, reaching long-term preservation.

In addition, when the system detects that the capacity of the main battery 40 is lower than the preset value, it will immediately issue a low battery (Low Battery) warning, but it will not be forced to enter the standby mode (suspend). Now, the user can still continue to use the palmtop computer, therefore, the main battery 40 does not need to reserve electric capacity, so the time of using the palmtop computer can be extended, but after the power is exhausted, the whole system including the storage unit 3 will have no power To maintain, it will shut down the whole. After shutting down, replace the main battery 40 or charge the main battery 40, and let the voltage be high to a certain level, and then restart the power button, it will become a reboot.

To sum up, in the present invention, when the handheld computer is in the low power supply (Low Battery), the second power output unit can output the second supply voltage to the storage unit according to the selection signal, and the standard mode (Standard Mode) As the selection of the power management means, alternatively, the output of the second supply voltage is stopped according to the selection signal, and the premium mode (Premium Mode) is used as the selection of the power management means. Therefore, the utility model is used to provide the handheld computer with a choice of two power management methods, Standard Mode and Premium Mode, in the case of Low Battery.

However, the above description is only the detailed description and accompanying drawings of one of the best specific embodiments of the present utility model, and any changes or modifications that can be easily imagined by those skilled in the art within the scope of the present utility model can be covered by the following utility model within the scope of the claims of the novelty.

Claims (9)

1. A selective backup power supply device is characterized in that, the power is supplied to the real-time clock and the storage unit, including: Backup battery, output backup voltage; a first power output unit connected to the backup battery and the real-time clock, the first power output unit receives the backup voltage, and outputs a first supply voltage to the real-time clock; and The second power output unit is connected to the backup battery and the storage unit. The second power output unit receives the backup voltage, and outputs a second supply voltage to the storage unit or stops outputting the second supply voltage according to a selection signal. 2. The optional backup power supply device according to claim 1, further comprising: a charging unit connected to the backup battery, the charging unit outputs a charging voltage to charge the backup battery. 3. The optional backup power supply device according to claim 2, further comprising: a main battery connected to the storage unit and the charging unit, the main battery outputs a first main voltage to the storage unit and Outputting the second main voltage to the charging unit. 4. The optional backup power supply device according to claim 3, wherein the charging unit includes: a step-down circuit, connected to the main battery, for stepping down the second main voltage to generate the charging voltage; and The current limiting circuit is connected to the step-down circuit to limit the magnitude of the charging current. 5. The selective backup power supply device according to claim 3, further comprising: a voltage clamping element connected to the main battery and the first power output unit, the voltage clamping element clamps the first - supply voltage. 6. The selective backup power supply device as claimed in claim 5, wherein the voltage clamping element is a Zener diode. 7. The selective backup power supply device as claimed in claim 1, wherein the first power output unit prevents the backup voltage from over-discharging and generates the first supply voltage. 8 . The selective backup power supply device as claimed in claim 1 , wherein the second power output unit prevents the backup voltage from over-discharging and generates the second supply voltage. 9. The selective backup power supply device as claimed in claim 1, wherein the storage unit is a synchronous dynamic random access memory.

Images