US 12,341,317 B2
Wave shaping circuit for laser driving circuit, laser driving circuit and laser device
Qiyou Wang, Guangdong (CN); Jianwei Huang, Guangdong (CN); Encai Ji, Guangdong (CN); and Yixiang Dai, Guangdong (CN)
Assigned to Suzhou Menovex Photonics Technology Co., Ltd, Suzhou (CN); and Menovex Medical Technology (Shenzhen) Co., Ltd, Shenzhen (CN)
Filed by Suzhou Menovex Photonics Technology Co., Ltd, Suzhou (CN); and Menovex Medical Technology (Shenzhen) Co., Ltd, Guangdong (CN)
Filed on Oct. 18, 2024, as Appl. No. 18/920,010.
Application 18/920,010 is a continuation of application No. PCT/CN2024/100257, filed on Jun. 20, 2024.
Prior Publication US 2025/0047062 A1, Feb. 6, 2025
Int. Cl. H01S 5/042 (2006.01); H01S 5/026 (2006.01)
CPC H01S 5/042 (2013.01) [H01S 5/0261 (2013.01)] 14 Claims
OG exemplary drawing
 
1. A wave shaping circuit for a laser driving circuit, characterized in that it comprises a signal input interface, a trigger starting unit, a delayed power supply control unit, a delay unit, an attenuation control unit, a constant voltage control unit, a signal coupling unit, and a signal output interface,
the signal input interface being respectively connected to the trigger starting unit and the signal coupling unit, and the input signal being divided into two signals after passing through the signal input interface, and being respectively sent to the trigger starting unit and the signal coupling unit, the signal coupling unit and the attenuation control unit being respectively connected to the signal output interface,
the trigger starting unit being configured to control the delayed power supply control unit to turn on when the voltage of the input signal is greater than a preset trigger comparison voltage,
when the delayed power supply control unit is turned on, the delay unit makes the attenuation control unit turn on, so that the input signal is attenuated by the constant voltage control unit after passing through the signal coupling unit, and after a delayed length of time, the delay unit turns off the attenuation control unit, and the input signal is not attenuated after the signal coupling unit,
the constant voltage control unit being connected to the attenuation control unit and being configured to control the amount of attenuation of the input signal,
the trigger starting unit comprises a first operational amplifier, a first resistor and a first rheostat,
an upper end of the first resistor being connected to a power supply voltage, a lower end of the first resistor being connected to an upper end of the first rheostat, and a lower end of the first rheostat being grounded, a positive electrode of the first operational amplifier being connected to the signal input interface, a negative electrode of the first operational amplifier being connected to the lower end of the first resistor and a center tap of the first rheostat, and an output end of the first operational amplifier being connected to the delayed power supply control unit,
the delay unit comprises a first capacitor and a second rheostat,
an upper end of the second rheostat being connected to the power supply voltage through the delayed power supply control unit, a lower end of the second rheostat being connected to an upper end of the first capacitor, and a lower end of the first capacitor being grounded,
the upper end of the second rheostat and a center tap of the second rheostat both being connected to the attenuation control unit, and being configured to supply power to the attenuation control unit to turn on the attenuation control unit,
the lower end of the second rheostat being connected to the attenuation control unit, and being configured to trigger the attenuation control unit to turn off based on a voltage boost of the first capacitor.