Pulse VCSEL (Vertical Cavity Surface Emitting Laser) laser driving circuit based on USB power supply

Abstract

The invention discloses a pulse VCSEL (Vertical Cavity Surface Emitting Laser) laser driving circuit based on USB power supply and a method thereof. The circuit comprises a VCSEL laser driving circuit, an energy storage circuit and a power processing module, wherein the VCSEL laser driving circuit is used for driving a VCSEL array; the energy storage circuit is used for storing electric energy and providing driving electric energy for the VCSEL laser driving circuit, and the energy storage circuit is electrically connected with the VCSEL laser driving circuit; and the power processing module is used for providing electric energy for the energy storage circuit, the power processing module is electrically connected with the energy storage circuit, the power supply module comprises a USB interface and the power processing module, and the power processing module is electrically connected with the USB interface.

Description

technical field [0001] The present invention relates to a VCSEL laser drive circuit, and further relates to a VCSEL array drive applied to handheld laser projection and 3D scanning products and a detection power supply module for laser reverse projection products. Background technique [0002] VCSEL (Vertical Cavity Surface Emitting Laser) is a new type of semiconductor laser, which has the advantages of single longitudinal mode operation, circular cross-section emitting light, easy to form a two-dimensional array, and suitable for on-line wafer-level testing. It is widely used. In the fields of photoelectric communication and photoelectric control. [0003] The VCSEL array is a high-power constant-current drive device, and generally requires an external dedicated high-power constant-current circuit to drive it. Therefore, when some low-power devices, such as handheld portable devices, 3D scanning products, and laser back projection modules, etc. apply VCSEL arrays in the c...

AI Technical Summary

Problems solved by technology

Therefore, when some low-power devices, such as handheld portable devices, 3D scanning products, and laser back projection modules, etc. apply VCSEL arrays in the circuit, due to the power supply characteristics of the device such as low voltage and low current, it cannot be used very quickly in these products. well applied VCSEL arrays, thus limiting the performance of the device

[0004] In some handheld portable devices, VCSEL arrays are used, and a lithium battery or a USB (Universal Serial Bus) port of a PC (Personal Computer) is used as the basic power supply. As we all know, for small portable devices, such as handheld laser projection pens, They all use batteries with small capacity, and the output voltage and current are low, while the output voltage of the USB port of the PC is generally 5V, which is also a low voltage. Therefore, the power supply method of these devices using VCSEL arrays cannot provide Sufficient driving energy to make the VCSEL array work normally

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