Many precision medical equipment in hospital imaging rooms cannot be separated from the protection of UPS power supply, but improper use of UPS power supply, especially when overcharging, will cause problems such as poor vents and aging lines, and even potential safety hazards. Let's analyze the application of UPS power supply in high-end color Doppler ultrasound room.

UPS power supply

The development of color Doppler ultrasound diagnostic apparatus has entered the era of all-digitalization. At present, high-end color Doppler ultrasound has a computer digital platform, built-in dual high-speed processors or multiple high-speed processors, adopts digital imaging processing technology, has network communication functions, and contains a wealth of measurement, quantitative analysis and calculation, image analysis, image reconstruction and post-processing And other computer software packages. This type of high-end color Doppler ultrasound system has higher requirements for the quality of UPS power supply than before. Since the power grid is prone to problems such as voltage surges, transients, overvoltages, undervoltages, and sudden power interruptions during peak power consumption, the lighter ones will cause the software, calculation data, and image data of the computer system in the color Doppler ultrasound to be damaged. , The more serious ones will cause damage to some computer hardware. Therefore, high-end color Doppler ultrasound needs a power supply system with functions such as voltage stabilization, frequency stabilization, filtering, resistance to electromagnetic and radio frequency interference, and prevention of sudden voltage interruption. The Golden Samurai high-frequency online UPS power supply of Huabao Power Supply is just such a suitable power supply system. In general, high-end color Doppler ultrasound all use on-line UPS power supply as the power supply. The Golden Samurai online UPS provides stable sine wave power output by the inverter in the machine when there is city power. When the power supply from the city power fails or is completely interrupted, the UPS built-in or external battery pack continues to supply the inverter to the inverter. DC power supply is provided to ensure that the inverter of the UPS power supply outputs a sine wave without time interruption.

However, the use of UPS as the power supply for high-end color Doppler ultrasound has caused new problems in the past two years. Taking a hospital in Zhejiang Province as an example, the ultrasound department configured a 6kVA online UPS power supply for a newly purchased high-end color Doppler ultrasound. As a result, serious radiation interference appeared on the two-dimensional echo image of the color Doppler ultrasound. Its manifestations were: The sector about 15° in the center of the fan-shaped echo area of the phased array cardiac probe is filled with strong bright-spot-like noise, and the higher frequency intracavity and superficial probes have several strong bright-like noises in the far field of the echo zone. Wavy interference. These interferences have seriously affected the ultrasound diagnosis, especially the diagnosis of cardiac ultrasound. Of course, whether the noise is generated and the strength of the noise are related to the brand of UPS power supply and the brand of color Doppler ultrasound diagnostic apparatus.

After continuous practice, the following methods are used to reduce or completely eliminate the interference of UPS power supply on color Doppler ultrasound:

(1) Ground the shield well. Install the ground wire according to the standard and connect it to the ground terminal of the UPS power supply and color Doppler ultrasound.

(2) Increase the distance. Because the radiation interference decreases as the distance increases, the UPS power supply compartment can be placed or the distance between the UPS power supply and the color Doppler ultrasound can be increased as far as possible if conditions permit.

(3) Install filter. On the basis of the Golden Samurai high-frequency online UPS power supply, an AC filter is installed at the output end. It is worth noting that when the UPS is connected to a large-capacity battery pack, a DC power filter must be installed at the output end of the battery pack or the battery inlet end of the UPS power supply host. This is because the internal connection between each unit battery in the battery pack and the connection from the battery pack to the UPS power supply host should have a certain self-inductance L and a very small resistance R when the inverter of the UPS uninterruptible power supply is working. Parallel circuit, it will excite high-frequency interference voltage under the action of high-frequency pulsating current, and increase with the increase of the load on the output end of the UPS power supply, and it will also produce radiation interference.

Therefore, when conditions permit, the connection length between the external battery pack and the UPS power supply host should be shortened and the cross-sectional area of the connection should be increased as much as possible.