CN203039578U

CN203039578U - A double-camera power supplying circuit of a mobile terminal

Info

Publication number: CN203039578U
Application number: CN 201320075804
Authority: CN
Inventors: 洪军可
Original assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Current assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Priority date: 2013-02-18
Filing date: 2013-02-18
Publication date: 2013-07-03
Anticipated expiration: 2023-02-18

Abstract

The utility model discloses a double-camera power supplying circuit of a mobile terminal. The double-camera power supplying circuit is used for supplying electricity for the first camera and the second camera of the mobile terminal. The double-camera power supplying circuit of a mobile terminal comprises a power supply module and a voltage-reducing circuit. The power supply module generates first power. The voltage-reducing circuit generates second power according to the first power. The first power supplies electricity for the digital core power end of the first camera. The second power supplies electricity for the digital core power end of the second camera. Compared with a product in the prior art, the voltage-reducing circuit converts the first power into the second power in view of the different voltage of the digital core power VDDs of the two cameras. Therefore, the digital core power ends of the two cameras share one common power so as to effectively relieve a problem of insufficient power supply of the power management module of the mobile terminal.

Description

The dual camera power supply circuits of portable terminal

Technical field

The utility model relates to a kind of camera power supply circuits, relates in particular to a kind of dual camera power supply circuits of portable terminal.

Background technology

Mobile phone is dissolved in the middle of everyone the routine work life as personal telecommunication terminal equipment, relates to the every aspect of work life.Especially present cell-phone function is various, both can communication contact, can also take photograph, especially camera function, because the camera transducer generally has 3 road power supplys: the AVDD(analog power), IOVDD(data-interface power supply) and VDD(digital core power supply).Ordinary circumstance AVDD is 2.8V, IOVDD is 1.8V, but the manufacturing process difference that VDD adopts owing to different camera transducers, voltage can be had any different, and the vdd voltage that the camera transducer that general pixel is more high adopts is more low: the camera transducer vdd voltage such as general 8M is 1.2V; That 5M generally is 1.5V; 2M and following generally be 1.8V.Now smart mobile phone generally all can dispose former and later two cameras, by the power module power supply of inside, AVDD with IOVDD because voltage is identical, so generally can common source; But VDD is owing to the pixel difference of the camera transducer of front and rear employing, and the voltage difference is so generally all power respectively.Because that the Power Management Unit in the smart mobile phone is a kind of height is integrated, at the power management scheme of portable use, being about to the discrete some class power management devices of tradition is incorporated within the single encapsulation, can realize higher power supply conversion efficiency and more low-power consumption like this, and package count still less is to adapt to the plate level space that dwindles.Yet, because the dual camera of intelligent object needs to export three different power supplys at least, above-mentioned Power Management Unit can't satisfy the power supply of this class dual camera module, with reference to figure 1, the dual camera power supply circuits of described portable terminal need be exported the AVDD power supply of a 2.8V, IOVDD power supply, a VDD_SUB power supply that supplies power to preposition camera module 11, VDD_MAIN power supply that supplies power to main camera module 12 of one 1.8, make the dual camera power supply circuit construction complexity of this portable terminal, the cost height.

Therefore, be badly in need of a kind of dual camera power supply circuits of the portable terminal that addresses the above problem.

The utility model content

The purpose of this utility model provides a kind of dual camera power supply circuits of portable terminal, the dual camera power supply circuits of this portable terminal can be at the vdd voltage difference of front and rear camera transducer, but a kind of power supply circuits of common source of design are effectively alleviated the problem of the power management module power shortage of portable terminal.

For on realizing purpose is arranged, the utility model discloses a kind of dual camera power supply circuits of portable terminal, be used for first camera and the power supply of second camera to portable terminal, the dual camera power supply circuits of this portable terminal comprise power module and reduction voltage circuit, described power module produces one first power supply, described reduction voltage circuit produces second source according to described first power supply, and described first power supply supplies power to the digital core power end of described first camera, and described second source supplies power to the digital core power end of described second camera.

Compared with prior art, the utility model is at the digital core power supply vdd voltage difference of dual camera, by reduction voltage circuit first power supply is converted to second source, make the digital core power end of dual camera share a common source, effectively alleviated the problem of the power management module power shortage of portable terminal.

Preferably, described reduction voltage circuit is at least one Schottky diode that is serially connected with between the digital core power end of described first power supply and described second camera, and is simple in structure.

Particularly, described reduction voltage circuit is a Schottky diode.

Particularly, described reduction voltage circuit is two Schottky diodes of series connection.

Preferably, described power module also produces one the 3rd power supply and one the 4th power supply, described the 3rd power supply supplies power to the analog power end of described first camera and second camera, and described the 4th power supply supplies power to the digital power end of described first camera and second camera.

Preferably, described first camera is preposition camera, and described second camera is rearmounted camera.

Description of drawings

Fig. 1 is the circuit diagram of the dual camera power supply circuits of portable terminal in the prior art.

Fig. 2 is the dual camera power supply circuits of portable terminal described in the utility model.

Fig. 3 is the dual camera power supply circuits of portable terminal described in another embodiment of the utility model.

Embodiment

By describing technology contents of the present utility model, structural feature in detail, realized purpose and effect, give explanation below in conjunction with execution mode and conjunction with figs. are detailed.

With reference to figure 1, the utility model discloses a kind of dual camera power supply circuits 200 of portable terminal, be used for

first camera

31 and 32 power supplies of second camera to portable terminal, the dual camera power supply circuits 200 of this portable terminal comprise power module 21 and reduction voltage circuit 22, described power module 21 produces one first power vd D_A, described reduction voltage circuit 22 produces second source VDD_B according to the described first power vd D_A, and the described first power vd D_A supplies power to the digital core power end VDD of described first camera 31, and described second source VDD_B supplies power to the digital core power end VDD of described second camera 32.To sum up, the utility model is at the digital core power supply vdd voltage difference of dual camera, by reduction voltage circuit the first power vd D_A is converted to second source VDD_B, make the digital core power end of dual camera share a common source, effectively alleviated the problem of the power management module power shortage of portable terminal.Wherein, described first camera 31 is preposition camera, and described second camera 32 is rearmounted camera.

In the present embodiment, the pixel of described first camera 31 is 2M, the pixel of second camera 32 is 5M, the voltage pressure reduction of the digital core power vd D of two cameras is 0.3V, and described reduction voltage circuit 22 is a Schottky diode between the digital core power end VDD that is serially connected with the described first power vd D_A and described second camera 32.Certainly, described reduction voltage circuit 22 can also be other circuit, is not limited in the circuit of Schottky diode composition.

Continuation is with reference to figure 2, described power module 21 also produces one the 3rd power supply AVDD_2.8V and one the 4th power supply IOVDD_1.8V, described the 3rd power supply AVDD_2.8V supplies power to the analog power end AVDD of described first camera 31 and second camera 32, and described the 4th power supply IOVDD_1.8V supplies power to the digital power end IOVDD of described first camera 31 and second camera 32.

With reference to figure 3, be second embodiment of the present utility model, in this embodiment, the pixel of described first camera 31 is 5M, the pixel of second camera 32 is 8M, the voltage pressure reduction of the digital core power vd D of two cameras is 0.6V, and described reduction voltage circuit 22 ' is two Schottky diodes between the digital core power end VDD that is serially connected with the described first power vd D_A and described second camera 32.Wherein, the Schottky diode number of described reduction voltage circuit 22 is determined according to the vdd voltage difference of the actual pixels needs of first camera 31 and second camera 32 by the designer.

Above disclosed only is preferred embodiment of the present utility model, can not limit the interest field of the utility model certainly with this, and therefore the equivalent variations of doing according to the utility model claim still belongs to the scope that the utility model is contained.

Claims

1. the dual camera power supply circuits of a portable terminal, be used for first camera and the power supply of second camera to portable terminal, it is characterized in that: comprise power module and reduction voltage circuit, described power module produces one first power supply, described reduction voltage circuit produces second source according to described first power supply, and described first power supply supplies power to the digital core power end of described first camera, and described second source supplies power to the digital core power end of described second camera.

2. the dual camera power supply circuits of portable terminal as claimed in claim 1 is characterized in that: described reduction voltage circuit is at least one Schottky diode that is serially connected with between the digital core power end of described first power supply and described second camera.

3. the dual camera power supply circuits of portable terminal as claimed in claim 2, it is characterized in that: described reduction voltage circuit is a Schottky diode.

4. the dual camera power supply circuits of portable terminal as claimed in claim 2 is characterized in that: two Schottky diodes of described reduction voltage circuit for connecting.

5. the dual camera power supply circuits of portable terminal as claimed in claim 1, it is characterized in that: described power module also produces one the 3rd power supply and one the 4th power supply, described the 3rd power supply supplies power to the analog power end of described first camera and second camera, and described the 4th power supply supplies power to the digital power end of described first camera and second camera.

6. the dual camera power supply circuits of portable terminal as claimed in claim 1, it is characterized in that: described first camera is preposition camera, described second camera is rearmounted camera.