Miniaturized low power high voltage power supply circuit design

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Overview:
At present, the high-voltage power supply adopts the form of a switching power supply, which greatly reduces the volumetric weight, increases the power, and improves the efficiency. In particular, high-voltage small-power switching power supplies are almost all switching power supply structures.

1 Introduction High-voltage power supplies have been widely used in medical, industrial non-destructive testing, station, customs inspection and other testing equipment, and are also widely used in military fields such as radar transmitters and electronic aerial image displays. The traditional high-voltage power supply is bulky and cumbersome, which seriously affects the development of the supporting equipment. At present, the high-voltage power supply adopts the form of a switching power supply, which greatly reduces the volumetric weight, increases the power, and improves the efficiency. In particular, high-voltage small-power switching power supplies are almost all switching power supply structures. The high-voltage, low-power switching power supply discussed in this article is designed for the X-ray TV perspective system. This system is an improvement over the original X-ray equipment, which adds a device called an image intensifier. This device uses electrodes to accelerate and focus the electrons, thus requiring a low-power, high-voltage power supply that is compatible with it.

2 Scheme The most common example of selecting a low-power high-voltage power supply is the anode high-voltage generator of a television set. It converts a tens of volts of DC power through a power conversion and a high-voltage transformer, and then rectifies and filters it into a high-voltage output; another application An example is a negative ion generator, which is often thyristor regulated. Both of the above voltage regulation methods require a separately adjustable auxiliary power supply, that is, a combination of high and low voltage. This increases the size and complexity of the power supply. In addition, due to the different circuit structure forms, their output voltage range is limited, and when a large range of adjustment is required, it can only be achieved by changing the supply voltage. The main circuit voltage adjustment range of the X-ray enhancer is nearly 10kV, and the above circuit form is difficult to meet the requirements. The half-bridge resonant switching power supply used in this paper successfully solved the above problems.

3 Technical indicators input voltage 220 (1 ± 10%) V, (50 ± 0.5) Hz; or a wide range of input voltage 180 ~ 250V.
Output voltage / current anode (positive) voltage / current nominal value +25kV / 1mA,
Voltage range +23kV~+32kV;
Nominal value +7.35kV/200μA,
Voltage range +6.0kV~+7.8kV;
Nominal value +0.985kV/200μA;
Voltage range +0.8kV~+1.1kV;
Cathode (negative) voltage / current nominal value -0.75kV / 500μA;
Voltage range -0.5kV~-1kV.
The above four voltages are linked together.
Stability is 1%.
Operating temperature range 0 °C ~ +40 °C.
Storage temperature range -40 ° C ~ +55 ° C.
Dimensions 160mm × 135mm × 43mm.
The electrodes of the image intensifier are inevitably burred during processing, and the tip discharge breaks the ignition at high voltage. To burn the burrs, a large current is required. In this way, on the one hand, the power output power is designed to be larger, and on the other hand, there should be perfect protection measures.
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