Abstract
This paper mainly introduces a design circuit and control method of pulse power supply for high-power semiconductor laser diode arrays. According to the high voltage and large current operating characteristics of semiconductor laser, the control strategy of multi-module cascade topology combined with multiple MOSFET connected in parallel is adopted. The topology of multi-module cascade is presented to meet the requirement of wide output voltage range. The multiple MOSFET connected in parallel in the grounding module is proposed to increase output current of the pulse power supply, and each MOSFET has exclusive closed-loop regulator. The pulse current is controlled by the gate driving voltage of the MOSFET which operates in the linear zone, which can ensure the pulse current to be smooth and stable without overshoot. Digital control and analog control are combined to make the control of the pulse power supply more flexible. An experimental platform with a pulse power of 132.3 kW is built. The parameters of pulse power supply are exhibited: pulse current 210 A, pulse voltage 630 V, pulse width 200μs, and repetition frequency 100 Hz.
Highlights
With the development of materials and technological advances, semiconductor laser has become more and more popular [1]–[3]
The general disadvantage of high-power semiconductor laser is very expensive and fragile, and the quality of the emitted laser is greatly affected by the pulse power supply [10]–[13]
In order to increase the output current of pulse power supply, a method of multiple MOSFET connected in parallel which operate in the linear zone is presented in this paper
Summary
With the development of materials and technological advances, semiconductor laser has become more and more popular [1]–[3]. If a pulse current of 210A is generated, the amplitude of the output pulse voltage is 210 ∗ 0.002 + 1.6 = 2.02V At this time, the single BAR works normally and emits laser. When the power switch of module 1 turns off, the module 1 does not participate in the work, and the current flows through other modules and the freewheeling diode Do1 to the semiconductor laser In order to increase the output current of pulse power supply, a method of multiple MOSFET connected in parallel which operate in the linear zone is presented in this paper.
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