Low-current output high-voltage power supply circuit wide in input voltage range and high in load regulation rate

Abstract

The invention discloses a high-voltage power supply circuit which is suitable for low-current output and is wide in input voltage range and high in load regulation rate. The output stability of a high-voltage power supply can be improved. An input filter circuit and a Buck current feed push-pull power convertor circuit conduct filtering on input voltage and then convert the input voltage into alternating-current pulse voltage which is constant in amplitude value and is with set frequency and duty ratio of a set value. An amplitude eliminating circuit performs amplitude elimination on the alternating-current pulse voltage output by the power convertor circuit. A Cockcroft-Walton voltage-multiplying rectifying-filtering circuit rectifies the alternating-current pulse voltage subjected to amplitude elimination into high voltage output. A voltage stabilizing circuit acquires and feeds back the high voltage output of the Cockcroft-Walton voltage-multiplying rectifying-filtering circuit to the control circuit. The control circuit produces a control signal for controlling the amplitude eliminating degree according a feedback result.

Description

technical field [0001] The invention belongs to the field of power electronics, and in particular relates to a high-voltage power supply circuit suitable for small current output that realizes wide voltage input and high load regulation rate. Background technique [0002] Most high-energy physics equipment and vacuum electronic equipment require high-voltage, low-current power supply. The working current is on the order of microamperes, and the instantaneous maximum current is on the order of milliamperes. The operating current range of the high-voltage power supply required by these high-energy physics and vacuum electronic equipment reaches 2 orders of magnitude; it is required to work normally under a wide range of input voltages, and the highest value of the input voltage is twice as high as the lowest value. Such a wide range of output current, The input voltage makes the output stability of the high-voltage power supply a great challenge. [0003] The present inventio...

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Problems solved by technology

[0003] The present invention is a high-voltage power supply circuit developed for the application of space high-energy physics equipment and vacuum electronic equipment. This circuit needs to output high-voltage and small currents. Usually, the filtering is LC mean value filtering, but for high-voltage and small currents, high voltage will lead to inductance L The two ends bear too much voltage, so that it cannot realize filtering; the small current leads to the design inductance value is too large, which cannot be realized; therefore, LC filtering is not suitable for high voltage and small current

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