A control circuit and control method for a pulsed xenon lamp power supply

Abstract

The invention relates to the field of power supplies for xenon lamp pump lasers, in particular to a control circuit and a control method for a pulsed xenon lamp power supply. Set the current feedback loop in the power feedback loop. After the first limiter, in the power mode, the current output by the power feedback loop can be limited by the current feedback loop of the subsequent stage, so that the final output current can be guaranteed at the power level. In a constant situation, it is avoided that the excessive current affects the service life of the xenon lamp, and even damages the xenon lamp. In addition, through the interpolation method, the required current waveform is output at equal intervals of smaller time intervals to realize the linear adjustment of the control signal, so that the control signal can adapt to the occasions where the power rises slowly or the power rises at different stages. quality.

Description

technical field [0001] The invention relates to the field of power supplies for xenon lamp pump lasers, in particular to a control circuit and a control method for a pulsed xenon lamp power supply. Background technique [0002] It is a very common method to use xenon lamp as the pump source of solid-state laser, and it is used more and more in the laser industry. Similarly, there are more and more requirements for power supply. Most of the control methods such as figure 1 Shown: This method has two feedback loops, namely power feedback loop 1 and current feedback loop 2, which work separately. When working in the current mode, the common end of the SPDT switch 4 is connected to the first PID control module 7, and the amplified and filtered signal output by the control signal 3 and the current sensor 20 is subtracted in the first subtractor 5 Operation, the output signal enters the first PID control module 7, performs PID operation, and outputs to the pulse modulation module...

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Problems solved by technology

[0003] This method has the following disadvantages: when using constant power control, the energy injected into the laser crystal is unstable due to the vibration or luminous efficiency of the arc in the xenon lamp. The energy injected into the laser crystal is very small, and the laser power supply needs to increase the voltage output to increase the current. The limiter can only limit the maximum pulse width, but not the maximum current. If the current is particularly large, it will greatly reduce the use of the xenon lamp. life, or even damage the xenon lamp

In addition, the control signal of the traditional method is a pulse signal, which cannot be adjusted in real time according to the welding process. It is not suitable for occasions where the power is slowly increased or the power increase speed is different in different stages, which affects the welding quality.

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