VI-21N-IV

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DC to DC converters are devices that convert fixed direct current (DC) electrical power from one voltage level to another, usually with relatively high efficiency. AVI-21N-IV is one of the most commonly used DC to DC converters which features wide input voltage range, high power efficiency and integrated circuit protection.

AVI-21N-IV application field mainly covers various communication network related equipments, testing instruments, LED lighting systems, industrial control systems, automatic control systems and monitoring systems. It is able to provide switched power over to the potential load fluctuations, extreme input voltage range and extreme temperature environment without decreasing power efficiency and increase reliability.

The working principle of AVI-21N-IV is based on Buck-boost converter topology. Basically, it consists of inductor, diode, capacitor, power switch and synchronization circuit. When power switch is “on”, the inductor starts working and energy is stored in the inductor which will be transferred to the output capacitor, when the switch turns to be “off”, the output capacitor discharge the energy through diode and energy is delivered to the load. According to the specific operating condition, the switch can switch more frequency and the power become the DC voltage which is provided to the load.

In order to improve the reliability and reduce the noise generated in the DC/DC converter, AVI-21N-IV applies several techniques, including over-voltage protection, under-voltage protection, over-temperature protection, synchronization circuits and current mode control.

AVI-21N-IV over-voltage protection helps to avoid the parameters of the switch to work out of its normal operating range. When the output voltage alerts the preset level, the over-voltage protection turns the power switch “off” to reduce the output until the output voltage returns back to its normal level.

Under-voltage protection helps to achieve better performance in light load conditions. It prohibits the switch to be “on” when the output voltage is too low, in order to keep the normal operating state of the switch and output voltage.

Due to the heat dissipation problem of the switch, over-temperature protection is necessary to stop the output voltage in order to protect the switch from burning. Over-temperature protection simply turns the power switch “off” when the temperature reaches its preset level and then turns it on again when the temperature turns to a normal state.

AVI-21N-IV synchronization circuits is another important technique to reduce the output ripple. The AVI-21N-IV applies a so called PWM synchronization circuit which synchronizes the power switch to the bucking grid, thereby reducing the output ripple.

Finally, the current mode control technique provides the AVI-21N-IV with the capability to handle very dynamic loads and also increases the efficiency. It uses the feedback from the inductor current to control the switching of the power switch, thereby providing a stable output under changing load conditions.

In conclusion, the AVI-21N-IV is an integrated DC to DC converter which provides wide input voltage range, high power efficiency, integrated circuit protection, and uses synchronization circuits and current mode control techniques. It is effectively used in various industrial applications where stability, efficiency and precision are required under extreme environment.

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