CN202160107U - Power switching circuit and power supply device of mobile terminal - Google Patents
Power switching circuit and power supply device of mobile terminal Download PDFInfo
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- CN202160107U CN202160107U CN2011202251843U CN201120225184U CN202160107U CN 202160107 U CN202160107 U CN 202160107U CN 2011202251843 U CN2011202251843 U CN 2011202251843U CN 201120225184 U CN201120225184 U CN 201120225184U CN 202160107 U CN202160107 U CN 202160107U
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Abstract
The utility model discloses a power switching circuit and a power supply device of a mobile terminal. The power supply device includes a power input terminal, a voltage stabilizer and a power output terminal. The power input terminal is used to connect an external power source and connect with an input terminal of the voltage stabilizer. An output terminal of the voltage stabilizer connects with the power output terminal and is in a ground connection through a resistor potential-divider network. A potential-divider node of the resistor potential-divider network connects with a regulating terminal of the voltage stabilizer. When applying the power supply device for supplying power to the mobile terminal in a factory production process, only a 5V power source is needed to meet different power supply requirements of a charging terminal and a battery terminal in the mobile terminal at the same time. And problems of system main board damages caused by the differences of power supply voltages in various mobile terminals of production lines can be solved fundamentally, thereby reducing the generation rate of fault items, lowering the production cost and improving the production rolled yield.
Description
Technical field
The utility model belongs to the electric power system technical field, specifically, the electric supply installation that relates to a kind of power-switching circuit and design based on this power-switching circuit, being used in the plant produced stage is that portable terminal provides supply power voltage.
Background technology
For present portable terminals such as mobile phone, all comprise two power supply terminal: DCIN and VBT usually.Wherein, DCIN is meant the charging terminal of mobile phone, and when plant produced, if utilize power supply directly to be the power supply of DCIN terminal, mobile phone just can Auto Power On; Generally speaking, the power supply voltage range of DCIN terminal is at [4.2V, 5.0V].VBT is meant the battery terminal of mobile phone, and when plant produced, some special station requires to give VBT terminal and DCIN terminal to supply power simultaneously; Generally speaking, the power supply voltage range of VBT terminal is at [3.6V, 4.2V].If the VBT terminal of mobile phone has loaded the voltage of DCIN terminal, promptly loaded the voltage of [4.2V, 5.0V], then very easily cause burning of cell phone mainboard.
Present mobile-terminal platform kind is a lot, and supply power mode is also varied, is exemplified below:
(1) based on the mobile phone products of Marvell920 platform and high pass QSC1110 platform, high pass QSC1100 platform; Require DCIN terminal and VBT terminal to supply power simultaneously, and the supply power voltage difference, the DCIN 5.0V that supplies power; The VBT 4.0V that supplies power; Need adopt double loop power supply and every road power supply all will connect correctly when causing producing like this, otherwise, burning of mainboard caused easily.
(2), all require VBT terminal power supply, and supply power voltage is traditionally arranged to be 4.0V when producing based on the mobile phone products of spreadtrum platform and MTK platform.
(3), all require DCIN terminal power supply, and supply power voltage is traditionally arranged to be 5.0V when producing based on the mobile phone products of platforms such as high pass QSC60X5, QSC60X0, MSM7625.
Factory is when producing, because the type and the kind of product are very many, these various power voltage requests make product lineman people when operation, supply voltage occur easily wrong problem is set, thus the situation that causes mainboard to burn.In order to reduce the generation of fault mobile phone; Reduce production costs; Existing solution all is to adopt the mode of behavior adjustment management control, promptly through strengthen the supervision and management of production line is avoided the situation appearance that supply voltage is provided with mistake occurring as far as possible, to solve operational error problem.But the enforceability of this behavior adjustment management control mode is obviously poor, can't fundamentally avoid the damage of mobile phone.
Summary of the invention
The purpose of the utility model is to provide a kind of power-switching circuit; Said power-switching circuit can provide the scope of a broad for the input power supply; Can both stablize certain specific magnitude of voltage of output in this scope as long as the power supply of input falls into, thereby guarantee the Electrical Safety of back level load.
For solving the problems of the technologies described above, the utility model adopts following technical scheme to be achieved:
A kind of power-switching circuit comprises power input terminal, pressurizer and power output terminal; Said power input terminal is used to connect the externally fed power supply, and is connected with the input of said pressurizer; The output of said pressurizer connects power output terminal, and through a resistance pressure-dividing network ground connection, the dividing potential drop node of said resistance pressure-dividing network connects the adjustable side of pressurizer.
Wherein, said pressurizer is the low pressure difference linear voltage regulator with fixing system reference value.
Further; In said resistance pressure-dividing network, include two resistance; The adjustable side of said pressurizer is through the output of first resistance connection pressurizer, and through second grounding through resistance, said first resistance equals to deduct 1 through the voltage magnitude that the output of pressurizer is exported again divided by the system reference value with the ratio of the resistance of second resistance; Resistance through regulating two resistance can change output voltage amplitude, makes it satisfy the need for electricity of back level load.
Preferably, said power input terminal and power output terminal are respectively through filter capacitor ground connection.
In order to prevent that the power supply reversal connection from damaging the system circuit board of back level load, said power input terminal connects the negative electrode of a diode, the plus earth of said diode.
Further, said power supply can select amplitude to be no more than the positive supply of 26V.
It is the electric supply installation that portable terminal provides its required supply power voltage when plant produced that two of the purpose of the utility model is to provide a kind of; Said electric supply installation is independent of outside the portable terminal, and electric supply installation is provided with power input terminal, pressurizer and power output terminal; Said power input terminal is used to connect the externally fed power supply, and is connected with the input of said pressurizer; The output of said pressurizer connects power output terminal, and through a resistance pressure-dividing network ground connection, the dividing potential drop node of said resistance pressure-dividing network connects the adjustable side of pressurizer.Through regulating the parameter value of resistance in the potential-divider network, the voltage magnitude that electric supply installation is exported satisfies the power reguirements of portable terminal.
Further, the power supply that is used for being connected with the power input terminal of said electric supply installation is the 5V DC power supply; Export the direct voltage of 3.6V to 4.2V through the output conversion of pressurizer.
Further again; On said electric supply installation, also be provided with the second source lead-out terminal that connects said power input terminal; When using said electric supply installation to supply power as portable terminal; Said power output terminal connects the battery terminal of portable terminal, and said second source lead-out terminal connects the charging terminal of portable terminal.
For battery terminal and the charging terminal misconnection that prevents two power output terminals and portable terminal, preferably described power output terminal and second source lead-out terminal branch are located in two dissimilar interfaces.
Compared with prior art; The advantage and the good effect of the utility model are: the power-switching circuit of the utility model can provide the voltage range of broad to the power supply of input; As long as input voltage is in 26V; Can obtain stable output voltage, and output voltage amplitude can freely adjust through the resistance of regulating in the resistance pressure-dividing network, thereby enlarge the suitable application area of this circuit.It is that portable terminal is supplied power that the electric supply installation that adopts said power-switching circuit design is applied in the process of factory production; Only need use one road 5V power supply can satisfy the different power reguirements of charging terminal and battery terminal in the portable terminal simultaneously thus; And fundamentally can solve the problem of producing the system board damage that all kinds of portable terminals of line cause because of the difference of supply power voltage; Reduce the generation rate of faulty item, reduced production cost, improved the first-pass yield of producing.
Description of drawings
Fig. 1 is the circuit theory diagrams of a kind of embodiment of the power-switching circuit that proposes of the utility model;
Fig. 2 is the system architecture sketch map of a kind of embodiment of the portable terminal electric supply installation that proposes of the utility model.
Embodiment
Describe in detail below in conjunction with the embodiment of accompanying drawing the utility model.
Embodiment one, and referring to shown in Figure 1, the power-switching circuit of present embodiment comprises pressurizer U1 and the power input terminal V that is connected with its input Vin
DCIN, the power output terminal V that is connected with its output end vo ut
VBTSaid pressurizer U1 preferably adopts a low pressure difference linear voltage regulator LDO with fixing system reference value to carry out circuit design; Is the LDO chip of 1.24V such as input voltage range with interior and system reference value at 26V; Linear voltage regulator uses transistor or the MOSFET that in its range of linearity, moves; From the input voltage of using, deduct the voltage that exceeds the quata, produce output voltage through overregulating.In order to regulate voltage magnitude through pressurizer U1 output; Present embodiment connects resistance pressure-dividing network at the output end vo ut of pressurizer U1; As shown in Figure 1; Can be in series by two resistance R 1, R2, be connected between the output end vo ut and ground of pressurizer U1, and its dividing potential drop node connects the adjustable side Adj of pressurizer U1.Thus one, according to the conversion formula of pressurizer U1: Vout=1.24V* (1+ (R1/R2)), the magnitude of voltage through pressurizer U1 output is stabilized on certain particular value through the resistance of regulating two resistance R 1, R2.
In order to guarantee input voltage and output voltage stabilization, present embodiment is preferably at said power input terminal V
DCINWith power output terminal V
VBTOn connect filter capacitor C1-C4 respectively, as shown in Figure 1, the other end ground connection of said filter capacitor C1-C4 is disturbed with the ripple that is used for filtering appts.
In the actual application of said power-switching circuit, through power input terminal V
DCINConnect outside power supply VCC, said power supply VCC can be through the output voltage of the stable output of said power-switching circuit amplitude and specific as long as the selection amplitude is no more than the positive supply of 26V.Situation for fear of occurring because of power supply VCC reversal connection causes the system circuit board of back level load to suffer damage takes place, and present embodiment is preferably at power input terminal V
DCINOn further connect a diode D1 again, as shown in Figure 1.The negative electrode of diode D1 is connected described power input terminal V
DCIN, the plus earth of diode D1, when the both positive and negative polarity of power supply VCC connects inverse time, diode D1 conducting, power supply VCC has just reached the purpose of design of avoiding damaging the late-class circuit plate thus owing to its both positive and negative polarity short circuit stops output.
Power-switching circuit shown in Figure 1 is arranged on one independently on the PCB platelet; Be designed to be independent of the electric supply installation of portable terminal; Be in plant produced during the stage at portable terminal; Being connected between externally fed power supply VCC and the portable terminal, the voltage transitions of power supply VCC is become the required supply power voltage of portable terminal, is the portable terminal power supply.
Present embodiment as the power supply object, is done in further detail explanation in conjunction with 2 pairs of said electric supply installations of accompanying drawing with mobile phone.
On said electric supply installation, be provided for connecting the input interface J1 of externally fed power supply VCC, said power input terminal V
DCINPromptly be defined among the described input interface J1.Because mobile phone is when plant produced, its charging terminal DCIN need use the supply power voltage of 4.2V-5.0V, and its battery terminal VBT need use the supply power voltage of 3.6V-4.2V.In order to save one road power supply; It is said electric supply installation power supply that present embodiment preferably adopts the power supply VCC of one tunnel+5V; Suitably select to be connected the resistance of first resistance R 1 and second resistance R 2 in the resistance pressure-dividing network of pressurizer U1 output end vo ut, the voltage magnitude of exporting through pressurizer U1 is stabilized in about 4V.With first resistance R 1 of selecting 100K Ω for use and second resistance R 2 of 43K Ω be that example describes, the voltage of then exporting through pressurizer U1: Vout=1.24* (1+100/43)=4.1V, just satisfy the power reguirements of battery of mobile phone terminal VBT.Even the power supply VCC of line body workman loading error like this, the voltage through pressurizer U1 output is always 4.1V, uses the output voltage of 4.1V to supply power as mobile phone, the sure abnormal electrical power supply that can not cause mobile phone.
Certainly; Described first resistance R 1 and second resistance R 2 also can adopt the resistive element of other resistances; As long as system reference value-1=[3.6V, 4.2V] ÷ 1.24V-1=[2,2.4] of the desired supply power voltage ÷ of R1/R2=battery of mobile phone terminal VBT pressurizer U1 gets final product.
In the present embodiment, can the power supply VCC of+5V be directly connected on the charging terminal DCIN of mobile phone when the mobile phone plant produced, the voltage through electric supply installation conversion output is connected on the battery terminal VBT of mobile phone, to satisfy the power reguirements of mobile phone.Certainly, also can the second source lead-out terminal be set further on electric supply installation, connect described power input terminal V
DCIN, and then unified charging terminal DCIN and battery terminal VBT through electric supply installation connection mobile phone, for mobile phone production debugging provides supply power voltage.
In order to prevent two-way voltage (such as 5V and 4.1V two-way voltage) and charging terminal DCIN in the mobile phone and the battery terminal VBT generation reversal connection problem through electric supply installation output, present embodiment preferably will be used to export the power output terminal V of 4.1V voltage
VBTBe defined in two dissimilar interfaces respectively with the second source lead-out terminal that is used for exporting 5V voltage; J2 as shown in Figure 2, J3, wherein, interface J2 can adopt 9 needle interfaces of standard; J3 can adopt 25 needle interfaces of standard; Because interface type is different fully, it is hereby ensured that the misconnection problem takes place line body workman, fundamentally solved the problem that cell phone mainboard that all kinds of mobile phones of line cause because of the difference of supply power voltage burns of producing.
Certainly, the electric supply installation mentality of designing of the utility model can apply in the Design of Test System of portable terminals such as communication products relevant with mobile phone or MP3, MP4 equally.
Should be noted that; The above only is a kind of preferred implementation of the utility model; For those skilled in the art; Under the prerequisite that does not break away from the utility model principle, can also make some improvement and retouching, these improvement and retouching also should be regarded as the protection range of the utility model.
Claims (10)
1. a power-switching circuit is characterized in that: comprise power input terminal, pressurizer and power output terminal; Said power input terminal is used to connect the externally fed power supply, and is connected with the input of said pressurizer; The output of said pressurizer connects power output terminal, and through a resistance pressure-dividing network ground connection, the dividing potential drop node of said resistance pressure-dividing network connects the adjustable side of pressurizer.
2. power-switching circuit according to claim 1 is characterized in that: said pressurizer is the low pressure difference linear voltage regulator with fixing system reference value.
3. power-switching circuit according to claim 2; It is characterized in that: in said resistance pressure-dividing network, include two resistance; The adjustable side of said pressurizer connects the output of pressurizer through first resistance; Through second grounding through resistance, said first resistance equals to deduct 1 through the voltage magnitude that the output of pressurizer is exported again divided by the system reference value with the ratio of the resistance of second resistance.
4. according to each described power-switching circuit in the claim 1 to 3, it is characterized in that: said power input terminal and power output terminal are respectively through filter capacitor ground connection.
5. according to each described power-switching circuit in the claim 1 to 3, it is characterized in that: said power input terminal connects the negative electrode of a diode, the plus earth of said diode.
6. according to each described power-switching circuit in the claim 1 to 3, it is characterized in that: said power supply is the positive supply that amplitude is no more than 26V.
7. the electric supply installation of a portable terminal, it is characterized in that: said electric supply installation is independent of outside the portable terminal, and it is provided with like the described power-switching circuit of each claim in the claim 1 to 6.
8. electric supply installation according to claim 7 is characterized in that: the power supply that is used for being connected with the power input terminal of said electric supply installation is the 5V DC power supply; Export the direct voltage of 3.6V to 4.2V through the output conversion of pressurizer.
9. electric supply installation according to claim 8; It is characterized in that: on said electric supply installation, also be provided with the second source lead-out terminal that connects said power input terminal; When using said electric supply installation to supply power as portable terminal; Said power output terminal connects the battery terminal of portable terminal, and said second source lead-out terminal connects the charging terminal of portable terminal.
10. according to the electric supply installation described in the claim 9, it is characterized in that: said power output terminal and second source lead-out terminal branch are located in two dissimilar interfaces.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202251843U CN202160107U (en) | 2011-06-29 | 2011-06-29 | Power switching circuit and power supply device of mobile terminal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202251843U CN202160107U (en) | 2011-06-29 | 2011-06-29 | Power switching circuit and power supply device of mobile terminal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202160107U true CN202160107U (en) | 2012-03-07 |
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ID=45767730
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011202251843U Expired - Fee Related CN202160107U (en) | 2011-06-29 | 2011-06-29 | Power switching circuit and power supply device of mobile terminal |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202160107U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104821649A (en) * | 2015-04-30 | 2015-08-05 | 上海闻泰电子科技有限公司 | Mobile phone equipment power supply management method |
| CN105515075A (en) * | 2014-09-26 | 2016-04-20 | 宇龙计算机通信科技(深圳)有限公司 | Mobile terminal |
| CN106291009A (en) * | 2016-08-11 | 2017-01-04 | 青岛海信移动通信技术股份有限公司 | Binary channel electric supply installation and electronic product production test equipment |
| CN115981441A (en) * | 2023-03-21 | 2023-04-18 | 湖南博匠信息科技有限公司 | Advanced telecommunication computing architecture case assembly and case based on double star topology |
-
2011
- 2011-06-29 CN CN2011202251843U patent/CN202160107U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105515075A (en) * | 2014-09-26 | 2016-04-20 | 宇龙计算机通信科技(深圳)有限公司 | Mobile terminal |
| CN105515075B (en) * | 2014-09-26 | 2018-02-13 | 宇龙计算机通信科技(深圳)有限公司 | A kind of mobile terminal |
| CN104821649A (en) * | 2015-04-30 | 2015-08-05 | 上海闻泰电子科技有限公司 | Mobile phone equipment power supply management method |
| CN106291009A (en) * | 2016-08-11 | 2017-01-04 | 青岛海信移动通信技术股份有限公司 | Binary channel electric supply installation and electronic product production test equipment |
| CN106291009B (en) * | 2016-08-11 | 2019-04-05 | 青岛海信移动通信技术股份有限公司 | Binary channel power supply unit and electronic product production test equipment |
| CN115981441A (en) * | 2023-03-21 | 2023-04-18 | 湖南博匠信息科技有限公司 | Advanced telecommunication computing architecture case assembly and case based on double star topology |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120307 Termination date: 20200629 |
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| CF01 | Termination of patent right due to non-payment of annual fee |