WO2009097769A1

WO2009097769A1 - Power supply management method, device and terminal

Info

Publication number: WO2009097769A1
Application number: PCT/CN2009/070135
Authority: WO
Inventors: Jinchun Ge; Jian Liu; Xueqiang Li
Original assignee: Shenzhen Huawei Communication Technologies Co., Ltd.
Priority date: 2008-01-31
Filing date: 2009-01-14
Publication date: 2009-08-13
Also published as: CN101227675A

Abstract

A power supply management method, a power supply management device and a terminal including the power supply management device. The power supply management method includes a step of counting operating voltages of all functional modules in active state and selecting the highest voltage from among the operating voltages (301,302), a step (303) of setting a value of an object voltage based on the highest voltage, and a step of converting an output voltage of a direct current power supply to the object voltage and converting the object voltage to the operating voltages of functional modules (101, 102, 304, 305). The power supply management device includes the device for carrying out the power supply management method.

Description

Power Management Method, Apparatus, and Terminal This application claims priority to Chinese Patent Application No. 200810006679.X filed on Jan. 31, 2008, entitled "Power Management Method, Apparatus, and Terminal".

Technical field

The present invention relates to the field of power supply, and more particularly to a method of managing an output voltage of a terminal power supply, and an apparatus for implementing the method.

BACKGROUND With the continuous development of electronic technologies, new requirements are placed on power management of terminals: First, the cost of power supply and power management is required to be low; Second, the utilization efficiency of power sources is required to be improved.

Taking the mobile phone as an example, since the voltage requirements of each function module in the mobile phone are different, the voltage outputted by the mobile phone power source is output to each functional module after passing through different transformer modules. The commonly used transformer modules include LD0 (low dropout linear regulator) and DC/DC (DC/DC) modules. Since the DC/DC module can change the output current, the power utilization of the DC/DC module can reach more than 90%, but the disadvantage of the DC/DC module is that its production cost is relatively high. The output current of LD0 is basically the same as the input current. Therefore, the power utilization ratio of LD0 is the ratio of output voltage to input voltage. Therefore, when the voltage difference between input voltage and output voltage is large, the power utilization rate of LD0 will be lower, but LD0. The advantage is that its production costs are lower.

Since there are many function modules in the mobile phone, and the working voltages of the various functional modules are not completely the same, in the mobile phone, a plurality of transformer modules need to be used to convert the voltage outputted by the battery into different voltages, and then output to the respective voltages. Various functional modules. For example, the mobile phone battery is a lithium battery, and the output voltage is about 3. 6V, but the operating voltage of most of the functional modules in the mobile phone is generally about 1.8V or lower. Therefore, when LD0 is used as the transformer module, the voltage difference between the input voltage and the output voltage is relatively large, so that the power utilization rate is less than 50%, resulting in waste of electric energy, which makes the power supply time of the mobile phone battery shorter. If a DC/DC module is used as the transformer module, although the power utilization can be achieved, the cost of power management is too high. Mobile computer, PDA The same problem exists in the terminal. , , | ^ ^ ^ The low cost and high efficiency of power management cannot be met at the same time. Summary of the invention

Embodiments of the present invention provide a power management method, apparatus, and terminal, which improve power utilization at a lower cost.

In order to achieve the above object, embodiments of the present invention use the following technical solutions:

A power management method includes:

Converting the output voltage of the DC power source to a target voltage;

The target voltage is converted to an operating voltage of each functional module.

A power management device includes:

a first voltage transformation unit, configured to convert an output voltage of the DC power source into a target voltage;

And a second voltage transformation unit, configured to convert the target voltage into an operating voltage of each functional module. A terminal includes a DC power supply and at least one functional module; and further includes:

The second voltage transformation unit is configured to convert the target voltage into operating voltages of the respective functional modules, and output to the respective functional modules. The embodiment described by the above technical solution employs a two-stage transformer method in which the voltage output from the DC power source is first converted to the target voltage, and then the target voltage is converted to the operating voltage of each functional module. When the voltage output from the DC power source is converted to the target voltage, the first transformer unit used has high power conversion efficiency, but the cost is high; and when the target voltage is converted to the operating voltage of each functional module, the used The cost of the two transformer unit is low, but when the input voltage and the output voltage have a large voltage difference, the power conversion efficiency is low. Therefore, by outputting the target voltage after the first transformer unit, the input voltage and the output voltage difference of the second transformer unit can be reduced to ensure higher power conversion efficiency. At the same time, since there is only one first transformer unit with higher cost, it is not necessary to equip each working voltage with a first transformer unit, which reduces the cost of power management.

BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a flowchart of Embodiment 1 of a power management method according to the present invention; 1 is a structural block diagram of Embodiment 1 of a power management module according to the present invention;

3 is a flowchart of Embodiment 2 of a power management method according to the present invention;

4 is a structural block diagram of Embodiment 2 of a power management module according to the present invention;

FIG. 5 is a structural block diagram of a control module in Embodiment 2 of a power management module according to the present invention;

6 is a schematic diagram of a terminal in Embodiment 3 of the present invention;

FIG. 7 is a block diagram of a specific implementation of a terminal in Embodiment 3 of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention convert a DC power supply through two stages of voltage transformation, and then output an operating voltage suitable for each functional module, so as to reduce the differential pressure of the second-stage transformer, so that a low-cost transformer is used. The second stage of voltage transformation can also achieve higher power utilization. The embodiments of the power management method, apparatus, and terminal of the present invention are described in detail below with reference to the accompanying drawings.

The following is an example of a low-end GSM mobile phone. The power management device in the mobile phone is implemented by a low-cost power management module. The power management module includes four LD0s (LD01, LD02, LD03, and LD04 respectively). The voltage output of the 1. 6V, 1. 8V, 1. 4V and 2. 8V is converted into a voltage output of 1. 2V, 1. 8V, 1. 4V and 2. 8V, respectively. The voltage of 2. 8V is the working voltage used for supplying the MMC card (Mul t imedi a Card) and the PLL (the phase loop circuit); 1. 2V is the working voltage used for the ARM9 (a type of CPU); 1. 8V is the operating voltage used for Memory (memory, including flash F la sh and synchronous dynamic random access memory SDRAM); 1. 4V is the operating voltage for RF Transceiver (RF transceiver), RF (radio frequency) amplifier Directly powered by battery.

Example 1:

As shown in FIG. 1 , it is an embodiment of a power management method according to the present invention, which is specifically described as follows:

101. Since the maximum operating voltage of the function module in the GSM mobile phone is 2. 8V, the 3. 6V DC voltage output from the battery is converted to the target voltage of 3. IV.

102. Convert the target voltage of 3. IV into the working voltage of each function module, and output it to each function module.

As shown in FIG. 1, corresponding to the foregoing power management method, the embodiment further provides a power management device, specifically including a first transforming unit and a second transforming unit: The first transformer unit is used to convert the 3. 6V DC voltage outputted by the battery to the target voltage of 3. IV; the second transformer unit is used to convert the target voltage of 3. IV into the work of each functional module. Voltage, and output to each function module.

The first transformer unit can be realized by a DC/DC module (DC-DC transformer), and the second transformer unit can be realized by the existing LD01, LD02, LD03, LD04.

In this embodiment, by outputting the target voltage after the first transformer unit, the input voltage and the output voltage difference of the second transformer unit can be reduced to ensure higher power conversion efficiency. At the same time, since there is only one first transformer unit with higher cost, it is not necessary to equip each working voltage with a first transformer unit, which reduces the cost of power management.

Example 2:

This embodiment is improved on the basis of Embodiment 1, as shown in FIG. 3, and the specific steps are as follows:

301. Count and record the working voltage of all functional modules in working state. If the mobile phone is in the standby state, only ARM9, F la sh/SDRAM, RF Trans iver are in working state, and the MMC card does not work, so record The operating voltages include: 1. 2V, 1. 8V and 1.4V;

302: Extracting the highest voltage among the recorded working voltages; the specific implementation is as follows: The recorded operating voltages are arranged in descending order of the voltage values, that is, 1. 8V, 1.4V,

1. 2V, and then take the top ranked 1. 8V of the operating voltage after the arrangement, as the highest voltage;

Or the highest voltage is the highest voltage. The highest operating voltage is used. The highest operating voltage is 1. 2V, 1. 4V, and 1. 8V. .

303. Set the target voltage to 2. 3V according to the highest voltage of 1. 8V.

304, so the 3. 6V DC voltage output from the battery is converted to a target voltage of 2. 3V.

305. Convert the target voltage of 2. 3V into the working voltage of each function module, and output it to each function module.

Corresponding to the above method, the embodiment further provides a power management device. As shown in FIG. 4, the power management device of the embodiment adds a DC/DC module (DC-DC transformer), which is connected to the output end of the battery and the above four. The output voltage of the DC/DC module is controlled between the inputs of the LD0 and through a control module. As shown in FIG. 5, in a specific application, the control module is implemented by a statistics unit, an extraction unit, and a control unit. The power management module in this embodiment specifically works as follows: First, the statistical unit calculates the operating voltage of the functional module in the mobile phone. If the mobile phone is currently in the standby state, then at this time, only ARM9, Flash/SDRAM, and RF Transciver are in working state, and the MMC card is Does not work, and records the operating voltage of each functional module, including: 1.2V, 1.4V, 1.8V.

Secondly, the extraction unit obtains the maximum operating voltage of all the functional modules in the working state. Then, if the mobile phone is in the standby state, the maximum value is 1.8V.

As shown in FIG. 5, in a specific application, the extracting unit can be implemented by the sorting module and the output module. First, the sorting module sorts the recorded working voltages in descending order, and then the output of the output module is ranked first. The working voltage, you can get the highest voltage of 1.8V. If the sorting modules are sorted in ascending order, then the output module outputs the last working voltage to get the highest voltage of 1.8V.

Then, the control unit controls the output voltage of the DC/DC module according to the highest voltage of 1.8V obtained by the extraction unit, in order to ensure that the voltage provided for each functional module is within the normal error range, the output voltage of the general DC/DC module. In this embodiment, the control unit sets the target voltage output by the DC/DC module to 2.3V.

Then, the DC/DC module operates according to the target voltage set by the control unit, and converts the 3.6V DC voltage output from the battery into a DC voltage of 1.3V.

Finally, LD01, LD02, and LD03 convert the target voltage of the DC/DC module output to 2.3V, respectively. The output voltage of LD01 is 1.2V, the output voltage of LD02 is 1.8V, and the output voltage of LD03 is 1.4. V.

The above LD0 can be realized by other low-cost transformer units or transformers, and the DC/DC module can also be realized by other transformer units or transformers with higher energy utilization.

In the above embodiment, since the power utilization rate of the DC/DC module can reach 95%, and the power utilization rate of the LD01 is about 1.2/2.3 «52%, the power utilization rate of the LD02 is about 1.8/2.3 «78%, LD03. The power utilization rate is approximately 1.4/2.3 «61%. Before using the embodiment of the present invention, all the voltages of the LD0 are directly supplied by the battery. Therefore, the power utilization rate of the LD01 is about 1.2/3.6 « 33.3%, and the power utilization rate of the LD02 is about 1.8/3.6 «5.%, LD03 The power utilization is about 1.4/3.6 « 39%. It can be seen from the above data that, after using the embodiment of the present invention, the power utilization rate of the mobile phone to the battery is improved. It can extend battery life and, in general, can extend battery life by 26%. At the same time, since only one DC/DC module is used in the embodiment of the present invention, other transformers still use the low cost LD0. Therefore, the cost of producing such a power management module is not much increased while implementing the efficient use of electrical energy in the embodiments of the present invention.

In the above embodiment, if the mobile phone is in a call state, then the ARM9, the Flash/SDRAM, and the RF Transciver are in a working state, and the MMC card is not in operation, and the control module controls the DC/DC module to output a voltage of 2.3 V according to the state; If the mobile phone is in the card reading state of the C card, that is, in the state of playing the music in the C card, then the ARM9, Flash/SDRAM work, the RF Transc iver does not work, but the MMC card is in working state, due to the work of the MMC card. The voltage is 2. 8V, so the control module needs to control the voltage of the DC output of the DC/DC module.

Example 3:

In this embodiment, the power management device in Embodiment 2 is applied to the terminal. As shown in FIG. 6, the power management device shown in FIG. 2 is used in the terminal, wherein the input terminal of the first transformer unit is connected to the DC power supply. The output of the second transformer unit is connected to each function module.

7 is an embodiment of the present invention in a mobile phone, wherein the DC power source is the battery of FIG. 7; and the function module is a circuit for implementing various functions in FIG. 7, for example: ARM9, Flash/SDRAM, MMC card, RF Transciver , RF amplifiers, etc.

In order to better manage the power supply, the mobile phone is improved in this embodiment, and the mobile phone includes a battery and a plurality of functional modules, such as: ARM9, Flash/SDRAM, RF Transciver, MMC card, PLL (phase loop circuit) )Wait. As shown in FIG. 7, the mobile phone further includes: a DC/DC module (DC-DC transformer) connected between the output end of the battery and the input terminals of the above four LD0, and controls the DC/DC module through a control module. Output voltage. The control module is implemented by a statistical unit, an extraction unit, and a control unit. The specific work is as follows:

First, the statistical unit counts the working voltage of the function module in the mobile phone state, assuming that the mobile phone is currently in the standby state, then at this time, generally only ARM9, Flash/SDRAM, RF Transciver is in working state, and the MMC card Does not work, and records the operating voltage of each functional module, including: 1. 2V, 1. 4V, 1. 8V.

Secondly, the extraction unit obtains the maximum value of the working voltage of all the functional modules in the working state. Then, if the mobile phone is in the standby state, the maximum value is 1. 8V.

The extracting unit can be realized by the sorting module and the output module. First, the sorting module sorts the recorded working voltages in descending order, and then the output module outputs the highest operating voltage, and the highest voltage is obtained. 8V. If the sorting module is sorted in ascending order, then the output module outputs the last working voltage to get the highest voltage of 1. 8V.

Then, the control unit controls the output voltage of the DC/DC module according to the voltage of 1.8 V obtained by the extraction unit. In order to ensure that the voltage provided for each function module is within the normal error range, the output voltage of the general DC/DC module is required. 3伏。 The target voltage of the output of the DC / DC module is set to 2. 3V.

Then, the DC/DC module operates according to the target voltage set by the control unit, and converts the 3. 6V DC voltage output from the battery into a DC voltage of 1. 3V.

The output voltage of the LD02 is 1. 2V, the output voltage of the LD02 is 1. 8V, the output of the LD03 is outputted by the LD01, the LD02, the LD03, and the output voltage of the DC/DC module is respectively converted to a different operating voltage. The voltage is 1. 4V.

In the mobile phone in this embodiment, since the power management device shown in FIG. 4 is used, the power management device first steps down the DC power outputted by the battery through the DC/DC module, and steps down the voltage through the LD0, so that the power utilization rate is improved. And because only one DC/DC module is used, the cost of the power management device is low.

Embodiments of the present invention are mainly used in terminals that require battery power, such as mobile phones, mobile computers, PDAs (Personal Digital Assistants).

The above is only the specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any change or replacement that can be easily conceived by those skilled in the art within the technical scope of the present invention is All should be covered by the scope of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

Claim

A power management method, characterized by comprising:

Converting the output voltage of the DC power source to a target voltage;

2. The power management method according to claim 1, further comprising: before converting the output voltage of the DC power source to the target voltage:

Count and record the operating voltage of all functional modules in working state;

Extracting the highest voltage among the recorded operating voltages;

The target voltage is set according to the highest voltage.

3. The power management method according to claim 2, wherein the extracting the highest voltage among the recorded operating voltages comprises:

The recorded operating voltages are arranged in descending order of voltage values;

The highest-ranked operating voltage among the arranged operating voltages is taken as the highest voltage.

4. The power management method according to claim 2, wherein the extracting the highest voltage among the recorded operating voltages comprises:

The recorded operating voltages are arranged in ascending order of voltage values;

The last operating voltage is sorted as the highest voltage among the aligned operating voltages.

5. A power management apparatus, comprising:

And a second voltage transformation unit, configured to convert the target voltage into an operating voltage of each functional module.

6. The power management apparatus according to claim 5, further comprising:

a statistical unit for counting and recording the working voltage of all functional modules in an active state; an extracting unit for extracting the highest voltage among the recorded operating voltages;

And a control unit, configured to control, according to the highest voltage, a target voltage output by the first voltage transformation unit.

The power management device according to claim 6, wherein the extracting unit comprises: a sorting module, configured to arrange the recorded operating voltages in descending order of voltage values; The output module is configured to output the first working voltage among the arranged operating voltages.

The power management device according to claim 6, wherein the extracting unit comprises: a sorting module, configured to arrange the recorded operating voltages in descending order of voltage values; and an output module, Outputs the last operating voltage of the aligned operating voltage.

9. The power management apparatus according to claim 5, wherein the second transforming unit comprises at least one low dropout linear regulator, and the first transforming unit comprises a DC-DC transformer.

10. A terminal, comprising a DC power supply and at least one functional module; further comprising: a first transformer unit for converting an output voltage of the DC power source to a target voltage;

The second voltage transformation unit is configured to convert the target voltage into operating voltages of the respective functional modules, and output to the respective functional modules.

The terminal according to claim 10, further comprising:

The terminal according to claim 11, wherein the extracting unit comprises: a sorting module, configured to arrange the recorded working voltages in descending order of voltage values; and an output module, configured to output the array The working voltage in the front of the working voltage.

The terminal according to claim 11, wherein the extracting unit comprises: a sorting module, configured to arrange the recorded operating voltages in descending order of voltage values; and an output module for outputting the array The last working voltage in the working voltage.