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A 3D structured light camera projection brightness control device

A technology of brightness control and structured light, which is applied in the field of 3D structured light camera projection brightness control devices, can solve the problems of difficulty in ensuring the accuracy of PWM signals and reference voltages, differences in the brightness of LED lights, and complicated acquisition processes, etc., to solve brightness differences and improve Accuracy, the effect of improving the accuracy of the power supply

Active Publication Date: 2022-01-11
SUZHOU CASIA ALL PHASE INTELLIGENCE TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] 1. The corresponding relationship between brightness and grayscale needs to be obtained by fitting projection brightness and ambient brightness, and the acquisition process is complicated
[0007] 2. Every time the brightness is adjusted, it is necessary to make an error judgment, and then adjust it again. If it does not exceed the allowable error range, it will not be adjusted, so the brightness will be inaccurate
[0008] 3. There are differences in the brightness of different LED lights under the same supply current
[0009] 4. Brightness control uses PWM to dynamically adjust the VSENSE pin voltage of the power supply chip to achieve current control, but the accuracy of the PWM signal and the reference voltage itself is difficult to guarantee

Method used

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  • A 3D structured light camera projection brightness control device
  • A 3D structured light camera projection brightness control device
  • A 3D structured light camera projection brightness control device

Examples

Experimental program
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Effect test

Embodiment approach

[0085] The PWM signal level conversion module further includes a first resistor R301, a second resistor R309 and a third resistor R306;

[0086] The PWM signal is input from one end of the first resistor R301, the other end of the first resistor R301 is connected to one end of the second resistor R309 and input to the gate of the second MOS transistor Q18, the second resistor R309 The other end is grounded;

[0087] The drain of the second MOS transistor Q18 is connected to one end of the third resistor R306 and the gate of the first MOS transistor Q17, and the other end of the third resistor R306 is connected to the output of the power conversion module;

[0088] The drain of the first MOS transistor Q17 is used as the output of the PWM signal level conversion module, and the high level used to realize the output of the PWM signal level conversion module is the voltage value output by the power conversion module.

[0089] As a preferred implementation, the power conversion m...

Embodiment 1

[0131] According to a specific embodiment of the present invention, in combination with the attached Figure 1-4 , the present invention will be described in detail.

[0132] The present invention provides a 3D structured light camera projection brightness control device, which includes a DC power supply basic module, and the DC power supply basic module includes a switching power supply module, an inductance-capacitor energy storage circuit, a current sampling resistor circuit, and a VSENSE voltage feedback circuit. To generate a constant current, also include:

[0133] PWM adjustment device;

[0134] The PWM regulating device includes a power conversion module and a PWM signal level conversion module;

[0135] The PWM signal level conversion module includes a first MOS transistor Q17 and a second MOS transistor Q18, and performs level conversion on the input PWM signal through a switch of the first MOS transistor and the second MOS transistor Q18;

[0136] The first MOS t...

Embodiment 2

[0183] The projection brightness control device mainly adopts the DC-DC power conversion chip MAX6070, and dynamically adjusts the duty cycle of the VDD_PWM signal through the software, which can realize the dynamic adjustment of the current of the sampling resistor R167. figure 2 , it can be seen that since the LED and R167 are connected in series, the I LED =I R167 .

[0184] I LED The value is calculated as follows:

[0185]

[0186] It can be seen from the formula that there are mainly three voltage-related parameters Vsense, VDD_PWM and VDD_3V3. Since Vsense is the precision reference voltage inside the DC power supply basic module, the accuracy is within 1%, and the impact on the circuit can be ignored. But usually the accuracy of VDD_PWM and VDD_3V3 cannot be guaranteed, basically around 5%.

[0187] The present invention adds a power conversion module and a PWM signal level conversion module based on the power conversion module in the circuit. The power convers...

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Abstract

The invention provides a 3D structured light camera projection brightness control device and method, belonging to the technical field of photoelectric projection. The present invention determines the standard grayscale reference value by using the basic source camera, and adjusts the brightness of the camera whose brightness is to be adjusted from the initial brightness value until the grayscale value corresponding to the brightness reaches the standard grayscale reference value. The brightness value corresponding to the gray value and the brightness value when the basic source camera reaches the gray reference value determine the projection brightness correction coefficient, and each time the brightness is adjusted, the set brightness value is multiplied by the projection brightness correction coefficient as the actual brightness value . The method realizes that the brightness setting of different LEDs reaches the same brightness value. The invention also adds a power conversion module, adopts a high-precision chip, and adds a PWM signal level conversion module to improve the precision of the reference voltage itself and the precision of the PWM signal, thereby improving the control precision of projection brightness.

Description

technical field [0001] The invention relates to the field of photoelectric projection technology, in particular to a 3D structured light camera projection brightness control device. Background technique [0002] The industrial 3D structured light camera is a high-precision three-dimensional measurement system. The consistency and accuracy of the projection brightness of its core component, the projection light machine, directly affects the measurement accuracy of the object. The brightness control of traditional industrial 3D structured light camera projection usually uses PWM to dynamically adjust the VSENSE pin voltage of the power supply chip to achieve current control, but the accuracy of the PWM signal and the reference voltage itself is difficult to guarantee. Secondly, because of the manufacturing process, different Under the same supply current, the brightness of different LED lights is also different, so it is difficult to ensure accurate control of projection brigh...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N9/31
CPCH04N9/3155H04N9/3164H04N9/3182Y02B20/40
Inventor 殷习全汪雪林顾庆毅
Owner SUZHOU CASIA ALL PHASE INTELLIGENCE TECH CO LTD