Impedance matching optical power control circuit of semiconductor laser pain therapy instrument

Abstract

The invention discloses an impedance matching optical power control circuit of a semiconductor laser pain treatment instrument, comprising an optical power signal acquisition circuit, a trigger impedance transformation circuit, an amplification and isolation circuit, and the laser power signal emitted by a laser collected by the optical power signal acquisition circuit is calculated by Amplifier subtraction operation, output voltage difference information, trigger the trigger signal of the thyristor in the impedance transformation circuit, the voltage difference signal after clamping and stabilizing is higher than 3.5V, so that the resistance of the impedance transformation circuit composed of inductors L2, L3 and capacitors C3, C4 After increasing, it is connected in parallel with resistor RA and then connected in series to the resonant circuit composed of inductor L4, capacitor C5, resistor R11 and diode D3 for further impedance matching to obtain a certain resistance value and then output, which is the inverting input terminal of the operational amplifier AR2 in the amplifying isolation circuit The input resistance, after proportional amplification\buffer isolation, provides a stable and elevated power supply voltage VCC for the laser, ensuring that the optical power emitted by the laser LD1 is constant and achieves therapeutic effects.

Description

technical field [0001] The invention relates to the technical field of medical devices, in particular to an impedance matching optical power control circuit of a semiconductor laser pain treatment instrument. Background technique [0002] Laser can produce biostimulation effect, promote cell regeneration, improve blood circulation, reduce inflammation and pain, reduce edema, regulate immune function of the body, semiconductor laser pain therapy device, adopts the wavelength range of 650 / 808nm human optical window, dual-wavelength composite light, tissue Penetration deepens up to 175px, produces multiple light effects, no trauma, no pain, safe and reliable, high output power, short treatment time, such as in orthopedics, bone pain, muscle pain, soft tissue pain, neuralgia, incision and wound pain, etc. It is widely used in trauma surgery and physical therapy of pain diseases. In actual use, due to the instability of the power supply voltage and the characteristics of the lase...

AI Technical Summary

Problems solved by technology

[0002] Laser can produce biostimulation effect, promote cell regeneration, improve blood circulation, reduce inflammation and pain, reduce edema, regulate immune function of the body, semiconductor laser pain therapy device, adopts the wavelength range of 650 / 808nm human optical window, dual-wavelength composite light, tissue Penetration deepens up to 175px, produces multiple light effects, no trauma, no pain, safe and reliable, high output power, short treatment time, such as in orthopedics, bone pain, muscle pain, soft tissue pain, neuralgia, incision and wound pain, etc. It is widely used in trauma surgery and physical therapy of pain diseases. In actual use, due to the instability of the power supply voltage and the characteristics of the laser itself (the working temperature will continue to rise and be converted into heat), the power of the laser will be unstable and increase. The power of the laser is attenuated, and the therapeutic effect cannot be achieved

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