A charging method and charging circuit for a pulse xenon lamp power supply energy storage capacitor

Abstract

The invention relates to a pulse xenon lamp pump laser power supply, in particular to a charging method and a charging circuit for an energy storage capacitor of the pulse xenon lamp power supply. On the basis of non-isolated boost charging, the phase-shift driving method is adopted, and the energy storage capacitor is slowly charged through the resistance; fast charging is performed after slow charging: the feedback circuit outputs two duty ratios according to the voltage signal fed back by the energy storage capacitor. The adjusted pulse modulation signal is the first pulse modulation signal and the second pulse modulation signal, and the interleaved parallel BOOST circuit is driven by the first pulse modulation signal and the second pulse modulation signal, so that the first inductance and the second inductance are interleaved in the current discontinuous In DCM mode, the first inductor and the second inductor take turns to rapidly charge the energy storage capacitor. The invention can make the energy storage inductance work in discontinuous mode, effectively reduce the current ripple, thereby reducing the load of the switching tube, and prolonging the service life of the energy storage capacitor.

Description

technical field [0001] The invention relates to a pulse xenon lamp pump laser power supply, in particular to a charging method and a charging circuit for an energy storage capacitor of the pulse xenon lamp power supply. Background technique [0002] Generally, high-power pulsed solid-state lasers mostly use flash xenon lamps as pump sources. The laser pulse energy is converted from electrical energy stored in a large-capacity energy storage capacitor into light energy through a xenon lamp, and then obtained by a suitable laser crystal with a resonant cavity. Therefore, the amount of energy in the storage capacitor directly affects the power of the final pulsed laser. The energy conversion of the pulsed xenon lamp laser power supply consists of the following subsystems: [0003] 1. AC-DC voltage conversion: This unit converts the AC voltage into the DC voltage required for arc lamp operation. [0004] 2. Energy storage capacitor: Charge the energy storage capacitor through t...

AI Technical Summary

Problems solved by technology

The voltage ripple will affect the current stability of the discharge part and reduce the reliability; the ripple current will also cause the energy storage capacitor to heat up, shorten the service life and gradually shrink the capacitance

The selection of the switching tube 11 will also be more difficult. In order to meet the needs of the current capacity, it may be necessary to use multiple switching tubes in parallel to meet the transient current sharing requirements of the device. For some IGBT drivers, it is impossible to enable multiple switches due to the negative temperature effect. The way of parallel connection of tubes expands the current capacity

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