CN102299620A - Voltage conversion circuit and handheld device - Google Patents
Voltage conversion circuit and handheld device Download PDFInfo
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- CN102299620A CN102299620A CN2010102093765A CN201010209376A CN102299620A CN 102299620 A CN102299620 A CN 102299620A CN 2010102093765 A CN2010102093765 A CN 2010102093765A CN 201010209376 A CN201010209376 A CN 201010209376A CN 102299620 A CN102299620 A CN 102299620A
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Abstract
The invention is suitable for the power source field and provides a voltage conversion circuit and a handheld device. The voltage conversion circuit comprises a direct current-direct current (DC) conversion unit, and at least one secondary low drop-out (LDO) conversion unit, wherein the DC-DC conversion unit is used for converting an input power source voltage into at least one DC-DC voltage value which is close to the LDO output; and the secondary LDO conversion unit is connected with the DC-DC conversion unit and is used for selecting the DC-DC voltage value output by the DC-DC conversion unit to generate LDO output voltage. In the invention, as a secondary voltage conversion circuit formed by the DC-DC conversion circuit and the LDO conversion circuit is adopted, the output voltage with lower stability is provided in the first stage; and in the second stage, parts of output voltage close to the voltage value needed by equipment parts is selected to carry out conversion voltage stabilizing process, so as to output high-stability current voltage, thus achieving the optimal balance of the conversion efficiency and the needed hardware cost.
Description
Technical field
The invention belongs to field of power supplies, relate in particular to a kind of voltage conversion circuit and handheld device.
Background technology
Handheld device is powered by single power supply, but device interior needs a plurality of voltage domains, and the voltage range of voltage domain and stability requirement have nothing in common with each other.For example, a handheld device is by a 4.2V lithium battery power supply, the internal digital circuit of core processor needs the operating voltage of 1.0V, because the coefficient of safety of logical circuit is lower to the supply power voltage stability requirement, generally have a high efficiency DC-to-DC (Direct Current-Direct Current, DC-DC) change-over circuit provides; The input and output digital circuit of core processor needs the operating voltage of 3.3V, and is same because the coefficient of safety of logical circuit is lower to the supply power voltage stability requirement, generally has a high efficiency DC-DC change-over circuit to provide; And audio signal imput output circuit (microphone input, earphone output) generally needs the 3.3V operating voltage of high stability, and the low pressure reduction of a high stability of needs (Low Drop-Out, LDO) change-over circuit provides; The shooting input needs the 2.5V operating voltage of a high stability, needs the LDO change-over circuit of another high stability to provide; LCD driving backlight then needs a 5V direct voltage efficiently.
In the existing handheld device potential circuit, the different voltage domains that require are provided by circuit branch independently respectively, as shown in Figure 1.There are two inefficient LDO change-over circuits in Fig. 1, and its efficient is respectively 3.3/4.2=79% and 2.5/4/2=60%.In order to solve the efficiency of LDO change-over circuit, the DC-DC change-over circuit of prefabricated level is provided for each LDO change-over circuit, utilize the DC-DC change-over circuit to be transformed into efficiently near the required output voltage values earlier the cell voltage of 4.2V, utilize the required voltage of LDO change-over circuit output high stability again, structure as shown in Figure 2.The problem of this scheme is the cost that has significantly increased power-switching circuit, because DC-DC change-over circuit and peripheral circuit thereof need high-quality a plurality of components and parts and chip area.
Summary of the invention
The purpose of the embodiment of the invention is to provide a kind of voltage conversion circuit, is intended to solve the high problem of power-switching circuit cost of existing handheld device circuit.
The embodiment of the invention is achieved in that a kind of voltage conversion circuit, and this voltage conversion circuit comprises:
The DC-DC converting unit is used for converting the supply voltage of input to DC-DC magnitude of voltage that at least one approaches LDO output;
At least one the secondary LDO converting unit that is connected with the DC-DC converting unit is used to select for use the DC-DC magnitude of voltage of DC-DC converting unit output to produce the LDO output voltage.
Another purpose of the embodiment of the invention is to provide a kind of handheld device, comprises a voltage conversion circuit, and this voltage conversion circuit comprises:
The DC-DC converting unit is used for converting the supply voltage of input to DC-DC magnitude of voltage that at least one approaches LDO output;
At least one the secondary LDO converting unit that is connected with the DC-DC converting unit is used to select for use the DC-DC magnitude of voltage of DC-DC converting unit output to produce the LDO output voltage.
The embodiment of the invention adopts the secondary voltage change-over circuit that is made of DC-DC change-over circuit and LDO change-over circuit, the first order provides the stable low output voltage that needs, the second level is chosen the part output voltage close with equipment unit required voltage value and is changed the high direct voltage of voltage stabilizing processing output stability, reaches the optimal balance of conversion efficiency and required hardware cost.
Description of drawings
Fig. 1 is the structural representation of a kind of handheld device voltage conversion circuit of providing of prior art;
Fig. 2 is the structural representation of the another kind of handheld device voltage conversion circuit that provides of prior art;
Fig. 3 is the structural representation of the voltage conversion circuit that provides of the embodiment of the invention;
Fig. 4 is the structural representation of the voltage conversion circuit that provides of embodiments of the invention 2,3;
Fig. 5 is the structural representation of an instantiation of the voltage conversion circuit that provides of the embodiment of the invention.
Embodiment
In order to make purpose of the present invention, technical scheme and advantage clearer,, the present invention is further elaborated below in conjunction with drawings and Examples.Should be appreciated that specific embodiment described herein only in order to explanation the present invention, and be not used in qualification the present invention.
The embodiment of the invention adopts the secondary voltage change-over circuit that is made of DC-DC change-over circuit and LDO change-over circuit, the first order provides the stable low output voltage that needs, and the second level is chosen the part output voltage close with equipment unit required voltage value and changed the high direct voltage of voltage stabilizing processing output stability.
The embodiment of the invention is achieved in that a kind of voltage conversion circuit, and this voltage conversion circuit comprises:
The DC-DC converting unit is used for converting the supply voltage of input to DC-DC magnitude of voltage that at least one approaches LDO output;
At least one the secondary LDO converting unit that is connected with the DC-DC converting unit is used to select for use the DC-DC magnitude of voltage of DC-DC converting unit output to produce the LDO output voltage.
Another purpose of the embodiment of the invention is to provide a kind of handheld device, comprises a voltage conversion circuit, and this voltage conversion circuit comprises:
The DC-DC converting unit is used for converting the supply voltage of input to DC-DC magnitude of voltage that at least one approaches LDO output;
At least one the secondary LDO converting unit that is connected with the DC-DC converting unit is used to select for use the DC-DC magnitude of voltage of DC-DC converting unit output to produce the LDO output voltage.
Below in conjunction with embodiment and accompanying drawing, embodiments of the present invention is further illustrated.
Fig. 3 shows the structure of the voltage conversion circuit of the embodiment of the invention, for convenience of explanation, only shows the part relevant with the embodiment of the invention.
This voltage conversion circuit comprises DC-DC converting unit 1 and LDO converting unit 2.The output of DC-DC converting unit 1 is connected with the input of LDO converting unit 2.
DC-DC converting unit 1 realizes the lifting conversion of direct voltage, is input as supply voltage, is output as according to the actual requirements and the lower direct voltage of stability that customizes.DC-DC converting unit 1 converts the supply voltage of input to DC-DC magnitude of voltage that at least one approaches LDO output.
DC-DC converting unit 1 provides the output voltage of several grades, has comprised all magnitudes of voltage lower to stability requirement, directly uses with the parts of supply equipment.Some voltage domain is higher to stability requirement, and this just need handle the output voltage that DC-DC converting unit 1 provides, and improves stability.So LDO converting unit 2 is chosen the output voltage close with the parts required voltage value of equipment as input, change with voltage stabilizing and handle the LDO output voltage that output stability is high then.
As shown in Figure 4, DC-DC converting unit 1 by some parallel be that the DC-DC change-over circuit that core constitutes is formed with the DC-DC chip, every DC-DC change-over circuit input is supply voltage Vin1, is output as the direct voltage of different magnitudes of voltage.
The quantity of DC-DC change-over circuit can determine that quantity can be adjusted according to the demand of equipment.
Every DC-DC change-over circuit has respectively and boosts or effect, output equipment or the LDO converting unit 2 needed direct voltages of step-down.
Embodiment 3
As shown in Figure 4, LDO converting unit 2 by some parallel be that the LDO change-over circuit that core constitutes is formed with the LDO chip.
The quantity of LDO change-over circuit can determine that quantity can be adjusted according to the demand of equipment.
With an instantiation embodiment of the invention is specifically described below.
As shown in Figure 5, DC-DC converting unit 1 is made of three parallel DC-DC change-over circuits, and input is the 4.2V cell voltage, and output is respectively 1.0V, the low stable voltage of 3.3V and 5V.LDO converting unit 2 is connected in parallel by two LDO change-over circuits and constitutes, article two, connect with the DC-DC change-over circuit of 3.3V after the LDO change-over circuit is connected in parallel, low stable direct voltage with 3.3V is input, change with voltage stabilizing and handle, export the high stability LDO output voltage of 3.3V and 2.5V respectively.
Compare with the scheme of Fig. 2, the scheme of utilizing the embodiment of the invention to provide makes the efficient of LDO change-over circuit reach 3.3/3.3=100% and 2.5/3.3=76% respectively when not increasing cost.
The embodiment of the invention adopts the secondary voltage change-over circuit that is made of DC-DC change-over circuit and LDO change-over circuit, the first order provides the stable low output voltage that needs, the second level is chosen the part output voltage close with equipment unit required voltage value and is changed the high direct voltage of voltage stabilizing processing output stability, reaches the optimal balance of conversion efficiency and required hardware cost.
The above only is preferred embodiment of the present invention, not in order to restriction the present invention, all any modifications of being done within the spirit and principles in the present invention, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (6)
1. a voltage conversion circuit is characterized in that, described voltage conversion circuit comprises:
The DC-DC converting unit is used for converting the supply voltage of input to DC-DC magnitude of voltage that at least one approaches LDO output;
At least one the secondary LDO converting unit that is connected with described DC-DC converting unit is used to select for use the DC-DC magnitude of voltage of described DC-DC converting unit output to produce the LDO output voltage.
2. voltage conversion circuit as claimed in claim 1 is characterized in that, described DC-DC converting unit comprises a plurality of parallel DC-DC change-over circuits.
3. voltage conversion circuit as claimed in claim 1 is characterized in that, described LDO converting unit comprises a plurality of parallel LDO change-over circuits.
4. a handheld device comprises a voltage conversion circuit, it is characterized in that, described voltage conversion circuit comprises:
The DC-DC converting unit is used for converting the supply voltage of input to DC-DC magnitude of voltage that at least one approaches LDO output;
At least one the secondary LDO converting unit that is connected with described DC-DC converting unit is used to select for use the DC-DC magnitude of voltage of described DC-DC converting unit output to produce the LDO output voltage.
5. handheld device as claimed in claim 4 is characterized in that, described DC-DC converting unit comprises a plurality of parallel DC-DC change-over circuits.
6. handheld device as claimed in claim 4 is characterized in that, described LDO converting unit comprises a plurality of parallel LDO change-over circuits.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102093765A CN102299620A (en) | 2010-06-24 | 2010-06-24 | Voltage conversion circuit and handheld device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102093765A CN102299620A (en) | 2010-06-24 | 2010-06-24 | Voltage conversion circuit and handheld device |
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| CN102299620A true CN102299620A (en) | 2011-12-28 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2010102093765A Pending CN102299620A (en) | 2010-06-24 | 2010-06-24 | Voltage conversion circuit and handheld device |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103217700A (en) * | 2013-04-10 | 2013-07-24 | 南昌大学 | GPS (global positioning system), IMU (inertial measurement unit), magnetometer and barometer combinational navigation system device |
| CN104202092A (en) * | 2014-09-18 | 2014-12-10 | 长芯盛（武汉）科技有限公司 | Receiving, transmitting and controlling three-in-one chip applicable to SFP (small form-factor pluggable) + high-speed photoelectric communication |
| CN106374757A (en) * | 2016-11-11 | 2017-02-01 | 温州乐发教育科技有限公司 | Electric power conversion device |
| CN107070181A (en) * | 2017-04-27 | 2017-08-18 | 青岛海信医疗设备股份有限公司 | Supply unit and its control method suitable for portable ultrasonic device |
| WO2018094910A1 (en) * | 2016-11-22 | 2018-05-31 | 华为技术有限公司 | Power supply circuit and audio playback device |
| CN108512282A (en) * | 2018-05-16 | 2018-09-07 | 维沃移动通信有限公司 | A kind of power supply circuit, terminal device and its method for controlling power supply |
| CN109302054A (en) * | 2018-08-24 | 2019-02-01 | 北斗航天汽车（北京）有限公司 | High efficiency smart car-mounted terminal controller power supply assembly and method |
| CN109510454A (en) * | 2018-12-26 | 2019-03-22 | 江苏集萃微纳自动化系统与装备技术研究所有限公司 | Multiple power supplies output system |
| CN110138205A (en) * | 2019-04-30 | 2019-08-16 | 吉林省智宸光电技术有限公司 | A kind of multichannel aerial camera low noise power supply component |
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| CN101098077A (en) * | 2007-06-25 | 2008-01-02 | 福建师范大学 | Navigation mark terminal power supply circuit with high stability and extensive adaptability power supply |
| US20080161073A1 (en) * | 2006-08-14 | 2008-07-03 | Joonbae Park | Radio frequency integrated circuit |
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| JPH089558A (en) * | 1994-06-23 | 1996-01-12 | Fuji Electric Co Ltd | Voltage converter for secondary battery |
| US20080161073A1 (en) * | 2006-08-14 | 2008-07-03 | Joonbae Park | Radio frequency integrated circuit |
| CN101098077A (en) * | 2007-06-25 | 2008-01-02 | 福建师范大学 | Navigation mark terminal power supply circuit with high stability and extensive adaptability power supply |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103217700A (en) * | 2013-04-10 | 2013-07-24 | 南昌大学 | GPS (global positioning system), IMU (inertial measurement unit), magnetometer and barometer combinational navigation system device |
| CN104202092A (en) * | 2014-09-18 | 2014-12-10 | 长芯盛（武汉）科技有限公司 | Receiving, transmitting and controlling three-in-one chip applicable to SFP (small form-factor pluggable) + high-speed photoelectric communication |
| CN106374757A (en) * | 2016-11-11 | 2017-02-01 | 温州乐发教育科技有限公司 | Electric power conversion device |
| WO2018094910A1 (en) * | 2016-11-22 | 2018-05-31 | 华为技术有限公司 | Power supply circuit and audio playback device |
| CN109565261A (en) * | 2016-11-22 | 2019-04-02 | 华为技术有限公司 | A kind of power supply circuit and audio-frequence player device |
| US10998858B2 (en) | 2016-11-22 | 2021-05-04 | Huawei Technologies Co., Ltd. | Power supply circuit and audio play device |
| CN107070181A (en) * | 2017-04-27 | 2017-08-18 | 青岛海信医疗设备股份有限公司 | Supply unit and its control method suitable for portable ultrasonic device |
| CN107070181B (en) * | 2017-04-27 | 2020-10-20 | 青岛海信医疗设备股份有限公司 | Power supply device suitable for portable ultrasonic equipment and control method thereof |
| CN108512282A (en) * | 2018-05-16 | 2018-09-07 | 维沃移动通信有限公司 | A kind of power supply circuit, terminal device and its method for controlling power supply |
| CN109302054A (en) * | 2018-08-24 | 2019-02-01 | 北斗航天汽车（北京）有限公司 | High efficiency smart car-mounted terminal controller power supply assembly and method |
| CN109510454A (en) * | 2018-12-26 | 2019-03-22 | 江苏集萃微纳自动化系统与装备技术研究所有限公司 | Multiple power supplies output system |
| CN110138205A (en) * | 2019-04-30 | 2019-08-16 | 吉林省智宸光电技术有限公司 | A kind of multichannel aerial camera low noise power supply component |
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Application publication date: 20111228 |