A high-voltage switching power supply adaptive soft-start system and method

Abstract

The invention relates to a high-voltage switching power supply self-adaptive soft start system and method, and belongs to the technical field of high-voltage switching power supply starting. It can make the DC high-voltage switching power supply above 2kV rise to the rated voltage according to the set step-up slope; it mainly includes power supply, rectification and filtering circuit, inverter circuit, pulse transformer, high-voltage rectification, voltage / current sampling circuit, voltage comparator, Single pole double throw switch A, single pole double throw switch B, slope voltage generating circuit, slope current generating circuit, error amplifier and soft start control circuit. Including voltage / current sampling circuit sampling; voltage comparator output corresponding voltage value; switch two SPDT switches; error amplifier performs error calculation, output control voltage to soft start control circuit; soft start control circuit controls inverter circuit to make high voltage The switching power supply is raised to the rated voltage; effectively reducing the surge current or overshoot voltage generated by capacitive and inductive loads, and improving the reliability of the switching power supply.

Description

technical field [0001] The present invention relates to an adaptive soft-start system and method for a high-voltage switching power supply, in particular to a system and method capable of realizing a high-voltage switching power supply above 2kV can rise to The technology of rated output voltage belongs to the technical field of soft start of high-voltage switching power supply. Background technique [0002] High-voltage switching power supply is widely used because of its wide input voltage range, high conversion efficiency, small output ripple and stable operation. Its load form can be capacitive load or inductive load. Ordinary soft-start high-voltage switching power supply has a rising slope or boosting slope much larger than the set slope when it is under capacitive or inductive loads, which can easily lead to excessive output surge current or voltage overshoot of the switching power supply. Damage to switching power supply and load. Adaptive soft-start technology can...

AI Technical Summary

Problems solved by technology

When the external switching rectifier is turned on, the current on the power inductor is sampled, and the stepwise change of the duty cycle is controlled by limiting the peak current change from small to large in stages, so that the output voltage rises slowly in stages, which can effectively avoid the start-up process The surge current in the medium, but there is a problem that the ability to suppress the overshoot voltage generated by the inductive load is not good

[0009] The above documents and patents either have a good suppression effect on the inrush current, or have a good suppression effect on the overshoot voltage, and the two cannot be balanced

Due to the complexity and uncertainty of the switching power supply load, the above documents and patents have certain limitations, and the boost or current ramp cannot be set according to the needs.

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