A laser current drive control circuit

Abstract

This invention discloses a laser current drive control circuit, including a multiplier A1, operational amplifier U2, operational amplifier U3, capacitor C1, resistor R2, resistor R3, resistor R4, switch S1, and switch S2. The first input terminal of multiplier A1 is connected to one end of capacitor C1, the output terminal of operational amplifier U2, and the non-inverting input of operational amplifier U3. The second input terminal of multiplier A1 is connected to IN3. The non-inverting input of operational amplifier U2 is connected to one end of resistor R2. The inverting input of operational amplifier U2 is connected to the other end of capacitor C1 and one end of resistor R3. The output terminal of operational amplifier U3 is connected to the positive terminal of switch S1 and one end of resistor R4. One end of switch S1 is connected to one end of switch S2 and IN1. The other end of switch S1 is connected to IN2. The other end of switch S2 is connected to the other end of resistor R3. IN1 inputs a positive adjustment signal, IN2 inputs a negative adjustment signal, and IN3 inputs an analog signal fed back from the numerical control system.

Description

Technical Field

[0001] This invention relates to the field of current drive technology, and in particular to a laser current drive control circuit. Background Technology

[0002] To enable laser cutting machines to adapt to diverse processing scenarios, laser cutting machine systems often integrate multiple lasers with different powers. However, the analog control signal output by the CNC system has a fixed range. This means that in traditional designs, each laser requires an independent signal gain module to scale the analog signal so that the laser power supply can output the specific current it needs. To solve this problem, a laser current drive control circuit is proposed, which can dynamically adjust the control range of the fixed analog signal to adapt to all lasers. This replaces the discrete gain module setting mode, improves the system integration and configuration flexibility, and reduces hardware complexity and overall cost. Summary of the Invention

[0003] To address the aforementioned technical problems, the present invention aims to provide a laser current drive control circuit, comprising a multiplier A1, operational amplifier U2, operational amplifier U3, capacitor C1, resistors R2, R3, and R4, switch S1, and switch S2. The first input terminal of multiplier A1 is connected to one end of capacitor C1, the output terminal of operational amplifier U2, and the non-inverting input of operational amplifier U3. The second input terminal of multiplier A1 is connected to IN3. The non-inverting input of operational amplifier U2 is connected to one end of resistor R2. Operational amplifier U2 is inverting. The other end of capacitor C1 and one end of resistor R3 are connected. The output terminal of operational amplifier U3 is connected to the positive terminal of switch S1 and one end of resistor R4. One end of switch S1 is connected to one end of switch S2 and the IN1 terminal. The other end of switch S1 is connected to the IN2 terminal. The other end of switch S2 is connected to the other end of resistor R3. IN1 is used to input a positive adjustment signal. IN2 is used to input a negative adjustment signal. IN3 is used to input an analog signal fed back from the CNC system. The negative terminals of switch S1 and S2, the other end of resistor R2, and the other end of resistor R4 are connected to the ground terminal.

[0004] Furthermore, it also includes an operational amplifier U4, an inverter U5, a diode D1, and a resistor R7. The inverting terminal of the operational amplifier U4 is connected to the IN3 terminal, the output terminal of the operational amplifier U4 is connected to the input terminal of the inverter U5 and the positive terminal of the switch S2, the anode of the diode D1 is connected to the output terminal of the inverter U5 and one end of the resistor R7, the cathode of the diode D1 is connected to the other end of the switch S2, and the other end of the resistor R7 is connected to the ground terminal.

[0005] Furthermore, it also includes resistors R5 and R6. One end of resistor R5 and one end of resistor R6 are connected to the inverting input of operational amplifier U3, the other end of resistor R5 is connected to the power supply, and the other end of resistor R6 is connected to the ground terminal.

[0006] Furthermore, it also includes resistors R8 and R9. One end of resistor R8 and one end of resistor R9 are connected to the non-inverting input of operational amplifier U4, the other end of resistor R8 is connected to the power supply, and the other end of resistor R9 is connected to the ground terminal.

[0007] Furthermore, it also includes an operational amplifier U1, a field-effect transistor Q1, and a resistor R1. The non-inverting input of the operational amplifier U1 is connected to the output of the multiplier A1, the inverting input of the operational amplifier U1 is connected to the source of the field-effect transistor Q1 and one end of the resistor R1, the output of the operational amplifier U1 is connected to the gate of the field-effect transistor Q1, the drain of the field-effect transistor Q1 is connected to the VIN terminal, and the other end of the resistor R1 is connected to the VOUT terminal.

[0008] Furthermore, resistors R5 and R6 are adjustable resistors.

[0009] Furthermore, resistors R8 and R9 are adjustable resistors.

[0010] The advantages of this invention compared to the prior art are: This invention can dynamically adjust the control range of a fixed analog signal to adapt to all lasers, replacing the setting mode of discrete gain modules, improving the system's integration and configuration flexibility while reducing hardware complexity and overall cost. Attached Figure Description

[0011] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the prior art and embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0012] Figure 1 The circuit structure diagram provided for this invention. Detailed Implementation

[0013] To make the objectives and advantages of the present invention clearer, the present invention will be specifically described below in conjunction with embodiments. It should be understood that the following text is only used to describe one or more specific embodiments of the present invention and does not strictly limit the scope of protection specifically claimed by the present invention.

[0014] This invention discloses a laser current drive control circuit, including a multiplier A1, operational amplifier U2, operational amplifier U3, capacitor C1, resistors R2, R3, and R4, switch S1, and switch S2. The first input terminal of multiplier A1 is connected to one end of capacitor C1, the output terminal of operational amplifier U2, and the non-inverting input of operational amplifier U3. The second input terminal of multiplier A1 is connected to IN3. The non-inverting input of operational amplifier U2 is connected to one end of resistor R2, and the inverting input of operational amplifier U2 is connected to capacitor C1. The other end is connected to one end of resistor R3. The output terminal of operational amplifier U3 is connected to the positive terminal of switch S1 and one end of resistor R4. One end of switch S1 is connected to one end of switch S2 and the IN1 terminal. The other end of switch S1 is connected to the IN2 terminal. The other end of switch S2 is connected to the other end of resistor R3. IN1 is used to input the positive adjustment signal, IN2 is used to input the reverse adjustment signal, and IN3 is used to input the analog signal fed back by the CNC system. The negative terminals of switch S1 and S2, the other end of resistor R2, the other end of resistor R4, and the ground terminal are connected.

[0015] Specifically, it also includes an operational amplifier U4, an inverter U5, a diode D1, and a resistor R7. The inverting terminal of the operational amplifier U4 is connected to the IN3 terminal, the output terminal of the operational amplifier U4 is connected to the input terminal of the inverter U5 and the positive terminal of the switch S2, the anode of the diode D1 is connected to the output terminal of the inverter U5 and one end of the resistor R7, the cathode of the diode D1 is connected to the other end of the switch S2, and the other end of the resistor R7 is connected to the ground terminal.

[0016] Specifically, it also includes resistors R5 and R6. One end of resistor R5 and one end of resistor R6 are connected to the inverting input of operational amplifier U3, the other end of resistor R5 is connected to the power supply, and the other end of resistor R6 is connected to the ground terminal.

[0017] Specifically, it also includes resistors R8 and R9. One end of resistor R8 and one end of resistor R9 are connected to the non-inverting input of operational amplifier U4, the other end of resistor R8 is connected to the power supply, and the other end of resistor R9 is connected to the ground terminal.

[0018] Specifically, it also includes an operational amplifier U1, a field-effect transistor Q1, and a resistor R1. The non-inverting input of the operational amplifier U1 is connected to the output of the multiplier A1, the inverting input of the operational amplifier U1 is connected to the source of the field-effect transistor Q1 and one end of the resistor R1, the output of the operational amplifier U1 is connected to the gate of the field-effect transistor Q1, the drain of the field-effect transistor Q1 is connected to the VIN terminal, and the other end of the resistor R1 is connected to the VOUT terminal.

[0019] Specifically, resistors R5 and R6 are adjustable resistors.

[0020] Specifically, resistors R8 and R9 are adjustable resistors.

[0021] The forward and reverse adjustment signals are provided by the manual / upper-level control circuit. IN1 inputs the forward adjustment signal, IN2 inputs the reverse adjustment signal, and IN3 inputs the analog signal fed back from the CNC system. The forward adjustment signal is a negative voltage, and the reverse adjustment signal is a positive voltage. The forward adjustment signal is input to the inverting input of operational amplifier U2 via switch S2 and resistor R3. Capacitor C1 is the feedback capacitor of operational amplifier U2, and resistor R2 is the bias resistor at the non-inverting input of operational amplifier U2. The output signal of operational amplifier U2 is a scaling signal. When operational amplifier U2 receives a forward adjustment signal, the amplitude of the scaling signal increases; when operational amplifier U2 loses the forward adjustment signal, the amplitude of the scaling signal stops increasing. The reverse adjustment signal is input to the inverting input of operational amplifier U2 via switches S1 and S2 and resistor R3. When operational amplifier U2 receives a reverse adjustment signal, the amplitude of the scaling signal decreases; when operational amplifier U2 loses the reverse adjustment signal, the amplitude of the scaling signal stops decreasing. The scaling signal is fed back to the non-inverting input of operational amplifier U3. The power signal is fed back to the non-inverting input via resistor R5. The signal from resistor R6 is fed to the ground terminal. The signal from resistor R6 is fed back to the inverting input of operational amplifier U3. The signal from resistor R6 is a zero-crossing reference signal. The zero-crossing reference signal is set by adjusting the values ​​of resistors R5 and R6. When the amplitude of the scaling signal is lower than the zero-crossing reference signal, operational amplifier U3 is cut off. The output signal of operational amplifier U3 is fed back to the ground terminal via resistor R4. The output signal of operational amplifier U3 is fed back to the positive terminal of switch S1. Switch S1 is opened to prevent operational amplifier U2 from obtaining a reverse adjustment signal when the scaling signal is zero. The scaling signal is fed back to the first input terminal of multiplier A1, and the analog signal is fed back to the second input terminal of multiplier A1. Multiplier A1 scales the analog signal based on the amplitude of the scaling signal and outputs it. The output signal of multiplier A1 is the drive control signal for the laser current. In this way, by adjusting the amplitude of the scaling signal, the control range of the fixed analog signal can be dynamically adjusted to adapt to all lasers, replacing the setting mode of discrete gain modules, improving the system integration and configuration flexibility while reducing hardware complexity and overall cost.

[0022] The power signal passes through resistors R8 and R9 to the ground terminal. The signal at resistor R9 is a soft-limiting signal. The amplitude of the soft-limiting signal is set by adjusting the resistance values ​​of resistors R8 and R9. The soft-limiting signal is input to the non-inverting input of operational amplifier U4. The amplitude of the soft-limiting signal is the maximum amplitude signal within the range of the analog signal. The inverting input of operational amplifier U4 synchronously acquires the analog signal. When the CNC system malfunctions and outputs an analog signal exceeding the range, operational amplifier U4 is cut off. The output signal of operational amplifier U4 is fed back to the positive terminal of switch S2 and the input terminal of inverter U5. Switch S2 is opened, and simultaneously, inverter U5 outputs the operational signal in reverse. The output signal of amplifier U4 and the output signal of inverter U5 are connected to ground via resistor R7. The signal at resistor R7 is input to the inverting input of operational amplifier U2 via diode D1 and resistor R3 to reduce the amplitude of the scaling signal and prevent overload damage to the laser when the CNC system outputs an analog signal exceeding the range. The non-inverting input of operational amplifier U1 receives the drive control signal for the laser current, and the inverting input detects the output current through resistor R1. The laser power supply signal is output to the laser via the drain and source of field-effect transistor Q1 and resistor R1. The higher the amplitude of the drive control signal for the laser current, the larger the output current.

[0023] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No markings in the claims should be construed as limiting the scope of the claims.

Claims

1. A laser current drive control circuit, characterized in that, The system includes a multiplier A1, operational amplifiers U2 and U3, a capacitor C1, resistors R2, R3, and R4, and switches S1 and S2. The first input terminal of multiplier A1 is connected to one end of capacitor C1, the output terminal of operational amplifier U2, and the non-inverting input of operational amplifier U3. The second input terminal of multiplier A1 is connected to IN3. The non-inverting input of operational amplifier U2 is connected to one end of resistor R2. The inverting input of operational amplifier U2 is connected to the other end of capacitor C1 and one end of resistor R3. The output terminal of operational amplifier U3 is connected to the positive terminal of switch S1 and one end of resistor R4. One end of switch S1 is connected to one end of switch S2 and IN1. The other end of switch S1 is connected to IN2. The other end of switch S2 is connected to the other end of resistor R3. IN1 receives a positive adjustment signal, IN2 receives a negative adjustment signal, and IN3 receives an analog signal fed back from the CNC system. The negative terminal of switch S1... The circuit includes a switch S2 (negative terminal), the other end of resistor R2, the other end of resistor R4, and ground. It also includes an operational amplifier U4, an inverter U5, a diode D1, and a resistor R7. The inverting input of operational amplifier U4 is connected to IN3. The output of operational amplifier U4 is connected to the input of inverter U5 and the positive terminal of switch S2. The anode of diode D1 is connected to the output of inverter U5 and one end of resistor R7. The cathode of diode D1 is connected to the other end of switch S2. The other end of resistor R7 is connected to ground. The circuit also includes an operational amplifier U1, a field-effect transistor Q1, and a resistor R1. The non-inverting input of operational amplifier U1 is connected to the output of multiplier A1. The inverting input of operational amplifier U1 is connected to the source of field-effect transistor Q1 and one end of resistor R1. The output of operational amplifier U1 is connected to the gate of field-effect transistor Q1. The drain of field-effect transistor Q1 is connected to VIN. The other end of resistor R1 is connected to VOUT.

2. The laser current drive control circuit according to claim 1, characterized in that, It also includes resistors R5 and R6. One end of resistor R5 and one end of resistor R6 are connected to the inverting input of operational amplifier U3. The other end of resistor R5 is connected to the power supply, and the other end of resistor R6 is connected to the ground.

3. The laser current drive control circuit according to claim 1, characterized in that, It also includes resistors R8 and R9. One end of resistor R8 and one end of resistor R9 are connected to the non-inverting input of operational amplifier U4. The other end of resistor R8 is connected to the power supply, and the other end of resistor R9 is connected to the ground.

4. The laser current drive control circuit according to claim 2, characterized in that, The resistors R5 and R6 are adjustable resistors.

5. The laser current drive control circuit according to claim 3, characterized in that, The resistors R8 and R9 are adjustable resistors.

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