Laser safety circuit and laser safety equipment

Abstract

The invention provides a laser safety circuit, which comprises a photosensitive diode, a resistor, a first capacitor, a second capacitor and a photosensitive chip, wherein the photosensitive chip is provided with a reference voltage port and an analog-to-digital converter; the photosensitive diode is used for monitoring the intensity change of light in a transmitting cavity of a transmitting module, and current signals with corresponding magnitudes pass through the photosensitive diode according to the intensity change of the light; the current signals with the corresponding magnitude are converted into voltage signals with the corresponding magnitude by the resistor; the second capacitor is used for being matched with the first capacitor to filter low-frequency signals and direct-current signals in the voltage signals; the reference voltage port is used for providing a reference voltage signal to the second capacitor; and the analog-to-digital converter is used for detecting the reference voltage signal of the second capacitor and the filtered voltage signal. According to the laser safety circuit, the problems that in the prior art, micro-current generated when ambient light irradiates a PD and dark current generated when the PD works can be detected by an ADC, judgment on the abnormal state of a transmitting module is interfered, and detection leakage and detection error are likely to be caused are solved.

Description

technical field [0001] The present application relates to the technical field of electronic circuits, in particular to a laser safety circuit and laser safety equipment. Background technique [0002] The 3D (Three Dimensional) imaging module includes a transmitting module and a receiving module. The transmitting module emits modulated light to the object to be measured, and the receiving module receives the light reflected from the surface of the object to be measured, so that the application of 3D imaging The electronic equipment of the module can realize the function of acquiring and displaying the depth information of the object to be measured. [0003] In the emission module, the light emitted by the laser emitter can form a surface light source with high uniformity and good directivity after being diffused by the light diffusion element, which is widely used in TOF (Time of flight, time of flight) modules to achieve 3D depth Measurement. However, due to the small emis...

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Problems solved by technology

[0006] In view of this, the present application provides a laser safety circuit and laser electronic equipment to solve the problem that in the laser safety circuit of the prior art, the micro current generated by ambient light irradiation on the PD and the dark current when the PD is working will be detected by the ADC, affecting the power of the PD. The detected output voltage of the laser transmitter causes the output voltage of the laser transmitter to fluctuate in different scenarios, which interferes with the judgment of the abnormal state of the transmitter module. There are cases of missed detection and false detection, which may easily cause potential safety hazards. question

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