Zero-volt load means that the electronic load can output a rated full current at a very low input voltage, and the current can be as high as hundreds of amperes. The electronic load has an unavoidable minimum internal resistance due to the conduction-drain-source internal resistance of the field effect transistor, and requires a certain minimum DC input voltage (UMIN) to enable the load to absorb the full rated current. Below this minimum operating voltage, the load current will decrease linearly. Usually below 3V, the load transistor is in the saturated working range, the current control ability becomes weaker, and the dynamic response becomes worse. The power supply voltage must be greater than the minimum operating voltage of the load, and the voltage drop of wires, relays, connectors, etc. under high current needs to be considered.

In 2022, Omicron will spread around the world, and the new crown epidemic will enter another round of peaks. Injecting the new crown vaccine is still one of the most powerful means of protection. But vaccine production is not evenly distributed around the world, and many impoverished regions need international assistance to complete the vaccinations. As we all know, vaccines need to be stored in a low temperature environment. How to ensure qualified storage and transportation in remote areas with poor infrastructure, such as African countries, has become an important issue. Vaccine refrigerators are widely used in terminals as a portable and independent storage device.

In the past few years, due to the large demands of solar energy, photovoltaic industry has embraced high speed development in China. However, it has presented slow increasing after booming at the very beginning with less and less demands. After the ‘5.31 new policy’ has been enforced, it’s urgent to alleviate the influences of decreased demands in a short time. So enterprises should work out how to obtain technology breakthrough or reduce costs. ITECH always devotes to explore test technology in applications of photovoltaic industry. We work with photovoltaic corporations and help them to become stronger, more precise and finally reach up to top level. Lately, ITECH will bring to market new product series, IT6000B/C/D with high performance, high voltage, high power density. You’ll find in this article how they are well applied to the test of photovoltaic inverters.

Background Semiconductor manufacturers have extremely high requirements on power supply, in particular the wafer related industry with higher requirements on power supply quality. Once voltage transient drop occurs, it will not only cause unexpected damage to sensitive microcomputer automatic control devices but also interrupt the process and cause great losses. To protect sensitive devices from voltage transient drop damage, the SEMI F47 standard stipulates the tolerance level of the semiconductor processing equipment on voltage transient drop, and requires that the semiconductor processing equipment should be immune to voltage transient drop in the AC power grid.

Information age, the reliability of power supply is increasingly required. Especially in some key applications, such as data centers, communication base stations, etc., the stability of the power supply is directly related to the normal operation of the entire system.