High-voltage DC power supply, high-voltage pulse modulator and radiotherapy equipment

Abstract

The invention relates to a high-voltage DC power supply, a high-voltage pulse modulator and radiotherapy equipment. The high-voltage DC power supply comprises a capacitor charging circuit, a feedbackcircuit and a modulation circuit, wherein the capacitor charging circuit is used for charging the capacitor, and the capacitor discharges to the outside after being charged; the feedback circuit is connected with the capacitor charging circuit and the modulation circuit and is used for acquiring circuit parameters of the capacitor charging circuit and transmitting the circuit parameters to the modulation circuit; the modulation circuit is connected with the capacitor charging circuit and used for collecting circuit parameters of the capacitor charging circuit, adjusting a modulation mode according to the circuit parameters, generating a modulation signal according to the circuit parameters and the adjusted modulation mode and transmitting the modulation signal to the capacitor charging circuit. Thus, the modulation mode of the modulation circuit is adjusted according to the circuit parameters, and a modulation mode is switched when the power supply is about to finish charging, so thatvoltage oscillation is suppressed, and high-precision voltage control is realized.

Description

technical field [0001] The present application relates to the technical field of medical equipment, in particular to a high-voltage direct current power supply, a high-voltage pulse modulator and radiotherapy equipment. Background technique [0002] The high-voltage pulse modulator is a key component in radiotherapy equipment. Its main function is to provide pulse power to the microwave source, and its load is usually a magnetron or a klystron. The high-voltage pulse modulator is to output a series of pulse voltages with high power, certain repetition frequency and certain pulse width to these loads. The specific structure of the high-voltage pulse modulator is as follows: figure 1 As shown, a high-voltage pulse modulator is generally composed of three parts: a high-voltage direct current power supply 100 , a switch unit 200 and a pulse transformer 300 . [0003] High-voltage DC power supply, also called capacitor charging power supply, is an important part of the pulse mo...

AI Technical Summary

Problems solved by technology

There are two main problems in the study of high-voltage DC power supplies: constant charging current and stable charging voltage

[0004] In the current existing technology, the series resonant charging power supply is controlled by a single voltage loop. At the end of the power supply charging stage, due to the characteristics of the series resonant topology at light load, the voltage control will be unstable.

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