Impedance match-type optical power control circuit of semiconductor laser pain therapy instrument

Abstract

The invention discloses an impedance match-type optical power control circuit of a semiconductor laser pain therapy instrument, which comprises an optical power signal acquisition circuit, a trigger impedance conversion circuit and an amplification isolation circuit. The optical power signal acquisition circuit acquires laser power signals emitted by a laser, subtraction by an operational amplifier is carried out, voltage difference information is outputted, and trigger signals of a thyristor in the trigger impedance conversion circuit are triggered; when the voltage difference signals after clamping voltage stabilization are higher than 3.5 V, the resistance of the impedance conversion circuit formed by inductors L2 and L3 and capacitors C3 and C4 is increased, the impedance conversion circuit is then parallelly connected with a resistor RA and is then serially connected onto a resonant circuit formed by an inductor L4, a capacitor C5, a resistor R11 and a diode D3 for further impedance match, determined resistance is acquired and outputted as input resistor of an inverting input end of an operational amplifier AR2 in the amplification isolation circuit, after proportional amplification / buffer isolation, stable boosted power supply voltage VCC is provided for the laser, the power of light emitted by the laser LD1 is ensured to be constant, and therapy effects are achieved.

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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