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Home » News » Blog » 30w 40w 50w 60w 80w 100w120w 130w 150w CO2 laser tube driving circuit using operational amplifier

30w 40w 50w 60w 80w 100w120w 130w 150w CO2 laser tube driving circuit using operational amplifier

Views:0     Author:Site Editor     Publish Time: 2018-12-27      Origin:Site

30w 40w 50w 60w 80w 100w120w 130w 150w CO2 laser tube drive circuit employing an operational amplifier that overcomes some or some of the deficiencies of the prior art. 30w 40w 50w 60w 80w 100w120w  130w 150w CO2 laser tube driving circuit using an operational amplifier, comprising a30w 40w 50w 60w 80w 100w120w  130w 150w CO2 laser tube and a first operational amplifier, the30w 40w 50w 60w 80w 100w120w  130w 150w CO2 laser tube comprises a laser diode and a photodiode; the laser diode and the photodiode are simultaneously connected to a working voltage of the chip, and the working state of the laser diode is forward conduction State, the photodiode working state is a reverse cut-off state;

The inverting terminal of the first operational amplifier is connected to the working voltage, and the output end of the first operational amplifier is connected to the laser diode. The non-inverting terminal of the first operational amplifier is grounded and connected to the photodiode; the working voltage is connected through a first resistor. An inverting terminal of the first operational amplifier, a first capacitor is disposed between the inverting terminal of the first operational amplifier and the output terminal of the first operational amplifier. In the30w 40w 50w 60w 80w 100w120w  130w 150w CO2 laser tube driving circuit using the operational amplifier of the present invention, the non-inverting terminal of the first operational amplifier can be connected to the photodiode, and the photodiode can replace the optical intensity of the laser diode into an electrical signal, thereby making the first operational amplifier, A closed-loop control can be formed between the photodiode and the laser diode to better ensure the output power of the laser diode is stable. In addition, since the operational amplifier is less sensitive to temperature and less affected by device uniformity, it is better to ensure that the actual output power of the laser diode does not deviate significantly from the design output power. Preferably, the inverting terminal of the first operational amplifier is grounded through the second capacitor and is also grounded through the seventh resistor. The second capacitor has a value of 104 and the seventh resistor has a resistance of 100 KΩ. Thereby, the inverting end of the first operational amplifier can have a better response speed. Preferably, the non-inverting terminal of the first operational amplifier is grounded through an eighth resistor, and the resistance of the eighth resistor is 1.5 KΩ. Preferably, the resistance of the first resistor is 10 KΩ, the value of the first capacitor is 221, and the operating voltage of the chip is +3.3 V. Preferably, the access point of the working voltage of the chip is grounded through the third capacitor and grounded through the fourth capacitor. The third capacitor has a value of 106 and the fourth capacitor has a value of 104. Preferably, the laser diode is connected in parallel with a fifth capacitor, the fifth capacitor having a value of 103. Preferably, 30w 40w 50w 60w 80w 100w120w 130w 150w CO2 laser tube closing interface is also drawn at the non-inverting end of the first operational amplifier, and a ninth resistor is disposed between the30w 40w 50w 60w 80w 100w120w 130w 150w CO2 laser tube closing interface and the non-inverting terminal of the first operational amplifier, and the resistance of the ninth resistor is 10KΩ. This makes it preferable to turn off the laser diode by applying a high level at the30w 40w 50w 60w 80w 100w120w 130w 150w CO2 laser tube closing interface. Provided is an auto-calibration optical power circuit for use in the field of laser measurement, comprising 30w 40w 50w 60w 80w 100w120w 130w 150w CO2 laser tube IC1 and a dual operational amplifier IC2, the30w 40w 50w 60w 80w 100w120w 130w 150w CO2 laser tube IC1 comprising a laser diode LD and a photodiode PD, the dual operational amplifier IC2 comprising a first operational amplifier 110 and The second operational amplifier 120; the laser diode LD and the photodiode PD are simultaneously connected to a chip operating voltage VDD, and the laser diode LD is in a forward conduction state, and the photodiode PD is in a reversed state;

The inverting terminal of the first operational amplifier 110 is connected to the operating voltage Vi, and the output end of the first operational amplifier 110 is connected to the laser diode LD. The non-inverting terminal of the first operational amplifier 110 is grounded and connected to the photodiode PD; the operating voltage Vi The first resistor R1 is connected to the inverting terminal of the first operational amplifier 110, and the first capacitor C1 is disposed between the inverting terminal of the first operational amplifier 110 and the output terminal of the first operational amplifier 110;

The second operational amplifier 120 is configured as a differential amplifying circuit for detecting the operating current of the laser diode LD. A second resistor R2 is connected in series between the output end of the first operational amplifier 110 and the laser diode LD; and the inverting terminal of the second operational amplifier 120 is The second resistor R2 is connected to one end of the output end of the first operational amplifier 110, the non-inverting terminal of the second operational amplifier 120 is connected to the second resistor R2 and is connected to one end of the laser diode LD, and the output end of the second operational amplifier 120 is used for outputting the detection current IAD. The detection current IAD is used for feedback adjustment of the operating voltage Vi.

A third resistor R3 is connected in series between the inverting terminal of the second operational amplifier 120 and the second resistor R2, and the resistance of the third resistor R3 is 10KΩ; the in-phase terminal of the second operational amplifier 120 is connected in series with the second resistor R2. The resistance of the resistor R4 and the fourth resistor R4 is 10KΩ; a fifth resistor R5 is disposed between the inverting terminal of the second operational amplifier 120 and the output terminal of the second operational amplifier 120, and the resistance of the fifth resistor R5 is 100KΩ; The non-inverting terminal of the second operational amplifier 120 is also grounded through a sixth resistor R6, and the resistance of the sixth resistor R6 is 100KΩ.The inverting terminal of the first operational amplifier 110 is grounded through the second capacitor C2 and is also grounded through the seventh resistor R7. The second capacitor C2 has a value of 104 and the seventh resistor R7 has a resistance of 100 kΩ.

The non-inverting terminal of the first operational amplifier 110 is grounded through an eighth resistor R8, and the resistance of the eighth resistor R8 is 1.5 KΩ. The resistance of the first resistor R1 is 10KΩ, the value of the first capacitor C1 is 221, and the working voltage of the chip VDD is +3.3V. The laser diode LD is connected in parallel with a fifth capacitor C5, and the fifth capacitor C5 is labeled 103. A ninth resistor R9 is disposed between the30w 40w 50w 60w 80w 100w120w 130w 150w CO2 laser tube closing interface OSET and the non-inverting terminal of the first operational amplifier 110, and the resistance of the ninth resistor R9 is 10KΩ.

30w 40w 50w 60w 80w 100w120w 130w 150w CO2 laser tube driving circuit is provided, which differs from Embodiment 1 in that the operating current of the laser diode LD is not detected, that is, the operating voltage Vi at the laser diode LD is not feedback-adjusted by the actual operating current of the laser diode LD. Although there is no closed-loop adjustment between the actual operating current of the laser diode LD and the operating voltage Vi of the laser diode LD, due to the adoption of the first operational amplifier 110 and the closed loop of the photodiode PD between the input end and the output end of the first operational amplifier 110 The control system also overcomes the problem that the actual output power of the laser diode LD is greatly affected by the temperature and the triode performance due to the use of the triode in the prior art, and the actual output power of the laser diode LD can have better stability.


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