Wide Input Voltage Range: Design Flexibility Provided By Active Power Factor Correction

The global power grid boasts diverse and complex specifications, ranging from the North American standard of 120V to the EU's 230V, and even 347V or 400V three-phase power in some industrial scenarios. For AC/DC power supply design, compatibility with these different voltage standards is a fundamental prerequisite for product globalization. The introduction of capacitor bank for power factor improvement, especially the active topology, provides underlying technical support for power supply adaptation to such complex power grid environments.

Dual closed-loop control enables voltage adaptation

power correction device Through specific control logic, the power supply can cope with drastic fluctuations in input voltage. Its control architecture typically includes two core loops: an inner current control loop and an outer voltage control loop. The current control loop forces the input current waveform to closely follow the input voltage waveform, thereby eliminating current spikes caused by the rectifier circuit. When the input voltage amplitude varies within the range of 90V to 264V, this loop can quickly adjust the switching duty cycle to maintain an undistorted current waveform. The outer voltage loop is responsible for stabilizing the output, clamping the output voltage to the set value regardless of whether the input is low or high voltage.

Extended Range of Digital Controllers

In modern power supply design, digital signal processors (DSPs) are gradually replacing traditional analog circuits. The advantage of digital control lies in its flexibility. With digital control, the power factor correction device industrial can adapt to more extreme voltage conditions through software algorithms. For example, for fluctuations in input voltage amplitude, the digital loop can compensate for the slow response of the voltage loop in traditional analog control through techniques such as load current injection.

• Cooperation with Wide Bandgap Devices：

To achieve a truly wide input range, the control chip alone is insufficient; the power stage devices are equally crucial.

• Topology Selection:

Boost topologies, due to their continuous input current characteristics, have become a commonly used structure for achieving wide input ranges.

Active Power Factor Correction (APC) devices, through the synergistic work of advanced control technology and power devices, not only improve the power factor of the power supply but also provide a solid hardware foundation for adapting equipment to diverse global power grid environments. With the widespread adoption of digital control and wide bandgap semiconductors, future AC/DC power supplies will achieve higher efficiency and higher power density over a wider input range.