The role of PFC chips (Power Factor Correction Controllers) in power supply systems is mainly reflected in the following aspects:
Improve the efficiency of electricity utilization
By optimizing the phase matching of the input current waveform and voltage, the power factor (PF value close to 1) is significantly improved, reducing the load on the power grid. For example, the BIE Microelectronics KP2801A chip employs intelligent switching technology between Critical On-Mode (CRM) and Discontinuous On-Mode (DCM). Under full load, it operates in CRM mode to improve efficiency, while switching to DCM mode under light load to reduce losses.
Reduce input harmonic interference
PFC chips reduce input current harmonics (THD < 15%) through control algorithms, preventing pollution to the power grid. For example, Chipown's BP2628 chip supports a switching frequency of up to 540kHz, and in conjunction with gallium nitride (GaN) switches and silicon carbide (SiC) diodes, effectively reduces inductor size and suppresses electromagnetic interference.
Enhance system stability
The KP2801A features multiple safety mechanisms, including built-in undervoltage/overvoltage protection and overheat protection, to prevent system damage under overload or abnormal operating conditions. For example, it supports cycle-by-cycle current limiting (OCP), abnormal overcurrent protection (AOCP), and overheat protection (OTP) to ensure operational reliability.
Adaptable to various application scenarios
Suitable for consumer electronics, power tools, industrial power supplies, and other fields. For example, the BP2628D is designed for medium to high power fast charging, supports diode zero-current turn-off technology, reduces standby power consumption and improves conversion efficiency.
How does a PFC chip work?
The working principle of PFC chips in energy storage is mainly based on active power factor correction (APFC) technology. By adjusting the phase relationship between current and voltage in the circuit, it improves the efficiency of power use and reduces the burden on the power grid. Simply put, PFC chips play an important role in energy storage systems by controlling input current, stabilizing DC bus voltage, regulating dynamic response, and providing protection functions.
The power factor, also known as the ratio of effective power to apparent power in a power system, is an important indicator of electrical energy utilization efficiency. Generally, this ratio should be close to 1, indicating high energy utilization efficiency and low energy loss.
Specifically, the operation of a PFC chip can be divided into several steps. First, rectification and filtering: alternating current is converted to direct current by a rectifier, and then high-frequency noise is removed by a filter circuit. Then, a boost circuit or other topology is used to boost the voltage to the required level. Boost circuits are simple and efficient, providing a certain boost capability.
Meanwhile, the PFC chip adjusts the current in the inductor by controlling the switching transistor's on and off states, making it follow the voltage waveform changes, thereby achieving power factor correction. Typically, an inductor is connected after the full-bridge output as an energy storage element to store and release energy to stabilize the output voltage.
Some advanced PFC solutions employ digital control, such as STM32G4-based digital control PFC solutions, which can improve the system's intelligence and performance. To further enhance efficiency, wide-bandgap devices (such as SiC or GaN) can be used. These devices possess excellent reverse recovery characteristics, which help reduce conduction losses and improve efficiency.
Therefore, the role of PFC chips in energy storage systems is to ensure the efficient use of electrical energy and the efficient operation of equipment, while also helping to meet relevant power standards and regulations. In this way, energy storage devices can not only better serve users but also reduce the pressure on the power grid.
Furthermore, PFC chips improve the power factor, reducing ineffective energy loss and enabling energy storage devices to use energy more efficiently during charging and discharging. This is especially important for portable energy storage devices, which often need to operate for extended periods without an external power source.
The performance of energy storage devices depends not only on their storage capacity but also on their efficiency and impact on the power grid. Using PFC chips can improve overall performance, making energy storage devices more competitive in the market.
PFC chip solutions in the market
In the 1990s, Professor Erickson and others at the University of Colorado proposed the concept of a single-stage PFC converter, aiming to reduce the number of components, lower costs, and improve efficiency by combining the front-end boost circuit and the MOSFETs of the subsequent flyback or forward converter.
With the development of power electronics technology, PFC technology has been widely used, especially in fields such as power, metallurgy, chemical industry, coal mining, communications, and home appliances. Many PFC chip companies have also emerged in the market, providing solutions for various scenarios.
For example, major manufacturers such as ST, TI, PI, Infineon, and ON Semiconductor all have corresponding solutions. Domestic companies also have excellent solutions, such as Chipone Technology's BP2628. This chip supports critical continuous mode or discontinuous mode, enabling zero-current turn-off of the diode, which helps improve conversion efficiency and reduce electromagnetic interference.
Furthermore, the BP2628 incorporates comprehensive protection features, including cycle-by-cycle overcurrent protection, output overvoltage protection, chip power supply undervoltage protection, feedback pin short-circuit protection, and internal chip overheat protection, ensuring reliable system operation. Additionally, the feedback pin short-circuit protection function can be used for PFC-level switching control, reducing system standby power consumption.
The Key Role and Market Trends of Power Factor Correction (PFC) Chips in Energy Storage Devices
The core function of energy storage devices is charging and discharging, but energy loss can lead to a reduction in overall energy efficiency. Furthermore, the dynamic responsiveness and stability of energy storage systems are also challenges, as they are prone to overload and other problems. To address these issues, power factor correction (PFC) controller chips have emerged and become an indispensable component of energy storage devices.
Detailed Explanation of the Important Role of PFC Chips
PFC chip working principle
PFC chips employ active power factor correction (APFC) technology, which improves energy utilization efficiency and reduces the burden on the power grid by adjusting the phase relationship between current and voltage in the circuit. Its operation includes rectification and filtering, voltage boosting via the BOOST circuit, and controlling the on and off states of the switching transistors. Through these steps, the PFC chip corrects the power factor, ensuring efficient energy utilization and high-efficiency equipment operation.
Detailed Explanation of the Important Role of PFC Chips
The key significance of power factor
Power factor, the ratio of effective power to apparent power in a power system, is a crucial indicator of electrical energy efficiency. A power factor close to 1 indicates efficient energy utilization and reduced energy loss. PFC chips improve the power factor, thereby enhancing the energy efficiency of energy storage devices during charging and discharging, which is especially important for portable energy storage devices.
Detailed Explanation of the Important Role of PFC Chips
PFC Chip Solutions and Market Trends
Working principle and digital control: Some advanced PFC solutions adopt digital control, such as the STM32G4-based digital control PFC solution, to improve the system's intelligence level and performance.
Wide bandgap device applications: Using wide bandgap devices (SiC or GaN) can reduce conduction losses and improve efficiency, making them suitable for high-performance applications.
PFC chip solutions on the market: ST, TI, PI, Infineon, ON Semiconductor, and other manufacturers offer a variety of PFC chip solutions to meet the needs of different fields. Domestic companies such as Chipone Technology, Southchip Technology, and B&M Microelectronics have also launched excellent solutions.
Applications of third-generation semiconductor materials: The widespread use of GaN switches and SiC diodes has improved the efficiency of PFC, reduced inductor size, and increased power density.
Improving power efficiency: PFC chips use active power factor correction technology to precisely control the phase of current and voltage, making the power factor close to 1, thereby significantly improving power efficiency and reducing the burden on the power grid.
Optimizing energy storage device performance: During the charging and discharging process of energy storage devices, PFC chips can address challenges related to energy loss and dynamic responsiveness, ensuring stable device operation and preventing overload issues. This is particularly important for portable devices, extending their lifespan and enhancing the user experience.
Driving Technological Innovation and Industrial Upgrading: Modern PFC chips employ digital control technologies, such as the STM32G4, enhancing system intelligence and performance. Simultaneously, the application of wide-bandgap devices like SiC and GaN further reduces conduction losses, meeting high-performance requirements. These technological innovations not only improve the efficiency of PFC chips but also bring revolutionary improvements to energy storage devices, driving the industrial upgrading of the entire energy storage sector.
Adapting to future development trends: With the widespread adoption of third-generation semiconductor materials, such as GaN switches and SiC diodes, the efficiency of PFC chips will be further improved, inductor size will be reduced, and power density will be increased. This will make energy storage devices more efficient, compact, and reliable, adapting to future trends in energy storage and conversion.
By applying PFC chips, energy storage devices not only improve energy utilization efficiency but also reduce the pressure on the power grid. The abundant PFC chip solutions on the market, especially those combining digital control and advanced semiconductor materials, make energy storage devices more competitive in a highly competitive market. In the future, with continuous technological innovation, PFC chips will continue to play a crucial role in driving performance improvements in energy storage devices.
