Design and experimental study of miniaturized high voltage power supply titanium pump

Describes a vacuum is applied to titanium ion pump to maintain the high pressure system in the small DC-AC switching power supply. High voltage switching power supply with a non- feedback push-pull structure, transformer using Mn-Zn ferrite core , high voltage output circuit using triple pressure structure , the rated output voltage 3KV, switching frequency up to 68KHZ, output power greater than 3W. Developed Sunrui titanium pump has been used in high-voltage power supply supporting inertial electrostatic meter with low power consumption , small size, wide operating temperature range of features.
Electrostatic ball bearings using titanium ion pump ( referred to as titanium pump ) to maintain the rotor - ball electrodes with ultra-high vacuum chamber is not less than 10-6Pa , you need to work outside when the titanium pump delivers up to several thousand volts DC high voltage . Direct impact on the performance of high voltage power supply if the degree of vacuum in the cavity of the bearing to meet the requirements . Therefore , the development of a small size, light weight , low power consumption , high reliability titanium pump high voltage power supply with high engineering value.
Mission to develop the technical requirements for high-voltage power supply comprising: an input voltage of 27V ± 10 % rated output voltage of 3000V, the output power of 3W ( when the maximum output power < output voltage is not less than 1.5KV, smaller than 54.8cm3, weighing less than 120g, ripple is less than 10% , temperature 20 ~ 80 ℃.
Because titanium pump power required by the inertial instruments placed inside , and therefore requires its small size, light weight , this circuit configuration , such as the power supply , the various components of the insulation and cooling issues put forward higher requirements. Wherein the selection of the transformer core , and the operating temperature and the power components to meet job requirements in the case of a volume as small as possible . Therefore , reducing the volume of titanium pump power is one of the difficulties of development work . High-voltage transformer is a core member of the high voltage power supply . In the high-voltage transformer , due to more turns , especially secondary turns up thousands of turns, when the operating frequency and voltage transformer high rate of change is large , we must consider the problem of distributed capacitance and leakage inductance of the transformer. Transformer leakage inductance and stray capacitance constitutes a series resonant circuit , which indirectly raises the transformer insulation requirements . In addition, titanium pump power factor requires a wide operating temperature range, power supply switching frequency, high voltage insulation , and other selected components also need to be considered .