CN210958154U

CN210958154U - Camera digital power supply variable voltage power supply circuit

Info

Publication number: CN210958154U
Application number: CN201922306659.0U
Authority: CN
Inventors: 马柏杰
Original assignee: Guangdong Yinuo Communication Co Ltd
Current assignee: Guangdong Yinuo Communication Co Ltd
Priority date: 2019-12-19
Filing date: 2019-12-19
Publication date: 2020-07-07
Anticipated expiration: 2029-12-19

Abstract

The utility model provides a pair of camera digital power supply variable voltage power supply circuit, including main control chip, camera and output voltage intelligent control unit, output voltage intelligent control unit includes low-dropout linear voltage regulator, divider resistance and change over switch's structure. When the cameras with different digital power supply voltages are used, the main control chip firstly identifies the ID signal voltage of the camera, judges whether the camera is a first supply material or a second supply material, controls the switch to be switched on or off once the materials are determined, configures the output voltage of the low-dropout linear voltage regulator, then controls the low-dropout linear voltage regulator to output power through the enabling signal of the low-dropout linear voltage regulator, and finally supplies power to the camera through digital power. The utility model has the advantages of simple structure can control in the cost, has solved intelligent terminal simultaneously on one of camera supplies and two supplies the material, and digital supply voltage is different, unable compatible problem.

Description

Camera digital power supply variable voltage power supply circuit

Technical Field

The utility model belongs to the technical field of intelligent terminal's camera circuit, especially, relate to a camera digital power supply variable voltage power supply circuit.

Background

LDO (low dropout regulator, which is a low dropout linear regulator and a step-down power supply) generally outputs a fixed voltage; the LDO output voltage is variable, generally controlled by a resistor configuration, and once set, the output voltage can not be adjusted at the later stage (unless BOM is changed); the Cameras (CAM) of the intelligent terminal are various in types, the power supply voltages of the cameras are different, the voltage of the DVDD (DVDD, digital power supply of the cameras) is generally three types, namely 1.05V, 1.2V and 1.8V, and in order to avoid the quality and supply problems of a single supply material (the camera provided by a supplier) in the trial production of the intelligent terminal equipment, two supplies (different cameras from one supply; only one of the two supplies is used during PCB (printed circuit board) pasting), and the other supply is mainly used. The digital power supply voltages of the first supply camera and the second supply camera are different, and the problem of incompatibility exists.

At present, two methods for solving the incompatibility problem are provided: firstly, a single supplier is adopted to provide the camera, and supply and quality risks exist; secondly, the cost will rise significantly by using LDO with I2C (I2C is a simple, bi-directional two-wire synchronous serial bus).

SUMMERY OF THE UTILITY MODEL

In order to overcome the above problem or partial problem, the utility model aims to provide a camera digital power supply variable voltage supply circuit, a new solution intelligent terminal supplies on the material that camera one supplies, two digital power supply voltage is different, unable compatible problem.

In order to achieve the purpose, the utility model adopts the following technical proposal:

the utility model provides a camera digital power supply variable voltage power supply circuit, includes main control chip, camera and output voltage intelligence control unit, output voltage intelligence control unit includes low-dropout linear regulator, divider resistance and change over switch, the ID signal of camera with main control chip connects, low-dropout linear regulator through enable signal with main control chip connects, change over switch passes through divider resistance changes low-dropout linear regulator's output voltage.

For the improvement of the present invention, the divider resistor includes a first resistor and a second resistor, the first resistor and the second resistor are connected in series to a circuit of the system circuit.

To the utility model discloses an improve, change over switch is MOS change over switch.

To the utility model discloses an improvement, MOS change over switch ' S grid G is connected the main control chip, MOS change over switch ' S drain electrode D is connected the linear stabiliser of low dropout, MOS change over switch ' S source electrode S ground connection.

To the utility model discloses an improve, when MOS change over switch switches on, the second resistance short circuit, the voltage that the FB repayment of low dropout linear regulator was returned is 0, changes output voltage, when MOS change over switch breaks off, the voltage that the FB obtained does first resistance with the voltage of the branch between the second resistance.

Compared with the prior art, the beneficial effects of the utility model are that:

the utility model provides a pair of camera digital power supply variable voltage power supply circuit, including main control chip, camera and output voltage intelligent control unit, output voltage intelligent control unit includes low-dropout linear voltage regulator, divider resistance and change over switch, the ID signal of camera with main control chip connects, low-dropout linear voltage regulator pass through enable signal with main control chip connects, change over switch passes through divider resistance changes the structure of low-dropout linear voltage regulator's output voltage. When the cameras with different digital power supply voltages are used, the main control chip firstly identifies the ID signal voltage of the camera after the camera is started, whether the camera is a primary supply material or a secondary supply material is judged, once the material is determined, the main control chip controls the switch to be switched on or switched off, the output voltage of the low-dropout linear voltage regulator is configured, then the main control chip controls the low-dropout linear voltage regulator to output power supply through an enabling signal of the low-dropout linear voltage regulator, and finally the camera is supplied with power through digital power supply. The utility model has the advantages of simple structure can control in the cost, has solved intelligent terminal simultaneously on one of camera supplies and two supplies the material, and digital supply voltage is different, unable compatible problem.

Drawings

Fig. 1 is a schematic diagram of the circuit principle of the present invention;

fig. 2 is a schematic diagram of the circuit principle of the low-dropout linear regulator of the present invention.

Detailed Description

In order to make the objects, technical solutions and effects of the present invention clearer and clearer, the following description of the present invention will refer to the accompanying drawings and illustrate embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.

In the description of the present invention, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or assembly referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may for example be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; the two components can be directly connected or indirectly connected through an intermediate medium, and the two components can be communicated with each other. The specific meaning of the above terms in the present invention can be understood in specific cases for those skilled in the art.

As shown in the accompanying

drawings

1 and 2, the utility model provides a pair of camera digital power supply variable voltage power supply circuit, including main control Chip (CPU), Camera (CAM) and output voltage intelligent control unit, output voltage intelligent control unit includes low dropout linear regulator (LDO), divider resistance and change over switch, the ID signal of camera with main control chip connects, low dropout linear regulator through enable signal with main control chip connects, change over switch passes through divider resistance changes low dropout linear regulator's output voltage. The current flow direction is as follows: system power (VBAT) → low dropout regulator (LDO) → digital power supply (DVDD) → Camera (CAM); when the cameras with different digital power supply voltages are used, after the camera is started, the main control chip firstly identifies the ID signal voltage of the camera, judges whether the camera is a first supply material or a second supply material (the first supply and the second supply are respectively a high level and a low level, the digital power supply of the first supply and the second supply are incompatible, for example, the first supply is connected with 1.8V electricity, and the second supply is connected with GND), once the materials are determined, the main control chip controls the switch to be switched on or off to configure the output voltage of the low-dropout linear voltage regulator, then, the main control chip controls the low-dropout linear voltage regulator to output power supply through an enabling signal of the low-dropout linear voltage regulator, and finally, the camera is supplied with the digital power supply. The utility model has the advantages of simple structure can control in the cost, has solved intelligent terminal simultaneously on one of camera supplies and two supplies the material, and digital supply voltage is different, unable compatible problem.

Preferably, the voltage dividing resistor includes a first resistor (R1938) and a second resistor (R1940), and the first resistor and the second resistor are connected in series to a circuit of the system electrical line (VBAT). The first resistor and the second resistor are connected in series on a circuit of the system circuit (VBAT) to play a role of voltage division, and a part of voltage is dropped on the voltage division resistor, so that the voltage at two ends of the part of circuit is reduced.

Preferably, the switch is a MOS switch.

Preferably, a gate G (i.e., a control signal) of the MOS switch is connected to the main control chip, a drain D of the MOS switch is connected to the low dropout regulator, and a source S of the MOS switch is grounded.

Preferably, when the MOS switch is turned on, the second resistor is short-circuited, a voltage fed back by the FB of the low dropout regulator is 0, so as to change an output voltage, and when the MOS switch is turned off, a voltage obtained by the FB is a divided voltage between the first resistor and the second resistor.

It should be understood that equivalent alterations and modifications can be made by those skilled in the art according to the technical solution of the present invention and the inventive concept thereof, and all such alterations and modifications should fall within the scope of the appended claims.

Claims

1. A camera digital power supply variable voltage power supply circuit is characterized in that: including main control chip, camera and output voltage intelligent control unit, output voltage intelligent control unit includes low-dropout linear regulator, divider resistance and change over switch, the ID signal of camera with main control chip connects, low-dropout linear regulator through enable signal with main control chip connects, change over switch passes through divider resistance changes low-dropout linear regulator's output voltage.

2. The camera digital supply variable voltage supply circuit according to claim 1, characterized in that: the voltage dividing resistor comprises a first resistor and a second resistor, and the first resistor and the second resistor are connected in series on a circuit of the system electricity.

3. The camera digital supply variable voltage supply circuit according to claim 2, characterized in that: the change-over switch is an MOS change-over switch.

4. The camera digital supply variable voltage supply circuit according to claim 3, characterized in that: the grid G of the MOS change-over switch is connected with the main control chip, the drain D of the MOS change-over switch is connected with the low dropout linear voltage regulator, and the source S of the MOS change-over switch is grounded.

5. The camera digital supply variable voltage supply circuit according to claim 4, wherein: when the MOS switch is switched on, the second resistor is in short circuit, the voltage fed back by the FB of the low dropout linear regulator is 0, the output voltage is changed, and when the MOS switch is switched off, the voltage obtained by the FB is the divided voltage between the first resistor and the second resistor.