Preface
PFC stands for Power Factor Correction. In an ideal environment, we want the power factor to be as close to 1 as possible, because this means that the input energy is almost completely used efficiently and converted into the energy required for the job, without ineffective power loss. However, in practice, due to the phase difference between current and voltage, invalid power is generated, which is what we usually call "reactive power".
Reactive power not only causes waste of energy, increases the cost of electricity, but also causes an additional burden on the power grid. In order to improve this situation, PFC circuits were developed. The main function of the PFC circuit is to adjust the phase difference between the current and the voltage to synchronize it as much as possible, so as to improve the power factor of the switching power supply system, reduce the generation of invalid power, reduce the waste of energy, and reduce the burden of the power grid. In addition, with the continuous improvement of global requirements for energy efficiency and environmental protection, many countries and regions have formulated strict power factor regulations and standards, and built-in PFC circuits have become one of the necessary measures to comply with these regulations and standards.
Application of PFC controller in multi-port charger
When the charging head network sorted out the dismantling cases in 2023, it was found that 16 PFC controllers were applied to multi-port fast charging, and some of the parameters of the chip are shown in the figure above.
onsemi NCP1607
onsemi NCP1607 is a PFC controller with critical conduction mode with multiple safety protection functions and is housed in an SOIC8 package.
Application Cases:
1. Teardown report: Belkin 108W 2A2C GaN desktop charger
onsemi NCP1622
The onsemi NCP1622 is an enhanced, high-efficiency step-up PFC controller that uses critical conduction mode to power the rectifier output for power factor correction for switching power supplies, and is available in a TSOP6 package.
Application Cases:
1、拆解报告：CE-LINK 142W 3C1A氮化镓充电器
2. Teardown report: Lenovo 140W USB-C power adapter
3. Dismantling report: Xiyuanyuan 100W USB-C GaN charger
onsemi NCP1623
onsemi NCP1623 PFC controllers are based on the innovative Valley Synchronous Frequency Foldback (VSFF) method. The VSFF maximizes efficiency at both nominal and light loads, operates in critical conduction mode at heavy loads, intermittent conduction mode at light loads, and supports valley turn-on for increased efficiency. NCP1623 supports critical-mode, intermittent conduction-mode operation, valley-sync frequency foldback improves efficiency at nominal and light loads, and provides good power factor at low switching frequencies, and is available in both TSOP6 and SOIC8 packages.
Application Cases:
1. Dismantling report: Anker 150W 3C1A GaN charger
DIODES AL6562A
DIODES AL6562A IS A CRITICAL-MODE PFC CONTROLLER WITH CRITICAL MODE CONTROL, LOW START-UP AND QUIESCENT CURRENT, BUILT-IN TOTEM-POLE OUTPUT, ADJUSTABLE OUTPUT OVERVOLTAGE PROTECTION, AND AN SO8 PACKAGE.
Application Cases:
1. Dismantling report: Mijia 120W magnetic rail GaN power supply
恩智浦TEA2016AAT
NXP's TEA2016AAT chip has a built-in LLC controller and a PFC controller, built-in digital architecture control, simplifying the design while reducing the number of peripheral components, multiple built-in comprehensive protection functions on the chip, a very high level of integration, and is available in an SO16 package.
Application Cases:
1. Dismantling report: Xulian 150W 3C1A gallium nitride desktop charger
2. Dismantling report: Baseus 140W 2C1A gallium nitride charger
3. Teardown report: NIO Life 210W desktop charger
4. Dismantling report: Jinhongtai 120W 3C1A four-port gallium nitride charger
5. Dismantling report: PANFORE 130W 3C1A gallium nitride charger
6. Teardown report: DJI 100W dual USB-C port GaN desktop charger
7. Dismantling report: Kewo 140W 1A1C gallium nitride charger
8. Dismantling report: Bull 240W 3C1A GaN desktop charger
9. Dismantling report: Xuntianhong 100W 3C1A gallium nitride charger
恩智浦TEA2017AAT
NXP'TEA2017AAT is a digitally configurable LLC and PFC combo controller for high-efficiency resonant power supplies. The chip includes LLC and PFC controller functions. The PFC can be configured to operate at a fixed frequency of DCM/QR, CCM, or multi-mode with all modes of operation to optimize PFC efficiency.
The chip integrates high-voltage start-up and X-capacitor discharge, and an integrated driver can directly drive the high-voltage upper tube without the need for an external driver. The PFC can be configured in three modes of operation: DCM/QR, DCM/QR/CCM mixed mode and CCM fixed frequency to meet the needs of different power applications and is available in an SO16 package.
Application Cases:
1. Dismantling report: TOMAX 140W 3C1A gallium nitride charger
恩智浦TEA8918BAT
NXP's TEA8918BAT is a power IC with a built-in PFC controller and LLC controller, replacing two separate chips in traditional high-power power supplies, improving power supply integration and simplifying design in an SO16 package.
Application Cases:
1. Dismantling report: Greenlink 140W 2C1A Smart Charging Magic Box Ultra
NXP TEA19162
NXP TEA19162 is a PFC controller that is used to boost the rectified voltage for active power factor correction, with an integrated X-capacitor discharge element that eliminates the need for external components, integrated soft-start and shutdown, high-precision voltage regulation and boost, and multiple built-in protection functions in an SO8 package.
Application Cases:
1. Teardown report: Honor 135W USB-C power adapter
Jewalt JW1571
JW1571 is a critical-mode PFC boost controller with high precision constant voltage output in SOP8 package for single-stage boost power factor correction (PFC) applications. The constant on-time control strategy ensures a high power factor, eliminating the need for input voltage detection circuitry, simplifying system design and saving losses. Critical on-mode operation reduces switching losses, improves EMI performance, and maximizes efficiency in an SOP8 package.
Application Cases:
1. Dismantling report: MOTO Motorola 125W GaN charger
2. Dismantling report: Bull 140W 3C1A gallium nitride fast charging socket
Jewalt JW1572
JW1572 is a step-up PFC controller with high precision constant voltage output for single-stage power factor correction. The chip uses constant on-time control to ensure a high power factor, eliminates the need for input voltage detection circuitry, simplifies system design and reduces losses, and is available in an SOP8 package.
Application Cases:
1. Dismantling report: Baseus 130W 2C1A gallium nitride charger
MPS HR1211
The MPS HR1211 is a multi-mode PFC and current-mode LLC 2-in-1 controller, which integrates the functions that traditional chip solutions require 2-3 chips to achieve in a single chip, and the PFC controller supports CCM and DCM operation modes.
HR1211 adopts digital loop control, and the chip parameters can be flexibly configured. It supports high-voltage start-up and intelligent X-capacitor discharge, PFC stage supports up to 250KHz operating frequency, LLC stage built-in 600V half-bridge driver, integrated bootstrap diode, operating frequency up to 500KHz, supports rich protection functions, and is available in SOIC-20 and TSSOP-20 packages.
Application Cases:
1. Dismantling report: Momis 140W 2C1A gallium nitride charger
2. Dismantling report: lifeme 140W 2C1A gallium nitride charger
MPS HR1270
The MPS HR1270 is a 2-in-1 controller with integrated PFC and LLC, which integrates functions that require 2-3 chips in a single chip, and is a successor to the HR1211, available in SOIC-20 and TSSOP-20 packages.
Application Cases:
1. Dismantling report: Jinxiang 140W 3C1A gallium nitride fast charging charger
MPS HR1275
The MPS HR1275 is a 2-in-1 digital controller with critical and intermittent mixed mode PFC control and current mode LLC that can be configured via a UART interface. Power-saving technology is built into the chip to help optimize efficiency across the entire operating range. The chip has built-in high-voltage start-up and X-capacitor discharge, and supports PG signal output, and is available in TSSOP-20, SOIC-20, and SOIC-16 packages.
Application Cases:
1. Dismantling report: Deuterium Feng 150W all-round GaN charger PA0228
Nanxin Technology SC3201
Nanxin SC3201 is a power factor correction (PFC) controller for boost converters, which adopts a multi-mode control strategy, which can achieve accurate valley detection without adding auxiliary windings to the boost inductor, which is suitable for wide output voltage scenarios and greatly reduces peripheral components.
Nanxin SC3201 adopts SOT23-6 package, VDD supports 9-30V, SC3201 not only supports VFB over-voltage protection, VDD under-voltage protection, periodic current limit protection, ultra-high temperature protection and other multiple protection measures, but also supports the second level of independent over-voltage, under-voltage and over-current protection. It can be used in USB-PD chargers, AC-DC adapters, LED drivers, industrial power supplies, power tools, etc., and is available in SOT23-6 package.
Application Cases:
1. Disassembly report: Xuanyang 100W 2A2C GaN desktop charger
Silicon Lijie SY5072B
Silergy Corp. PFC controllers SY5072B operate in critical mode with constant on-time, and a built-in boost converter with quasi-resonant switching for high efficiency and optimized EMI performance, available in a SOT23-6 package.
Application Cases:
1. Teardown report: Xiaomi 140W 2C1A GaN charger
2. Dismantling report: Bull 140W 3C1A Peak Series GaN Fast Charging Socket
3. Dismantling report: Regida 100W 2C1A gallium nitride charger
STMicroelectronics L6562A
The STMicroelectronics L6562A is a PFC controller that operates in transition mode. The chip has a built-in THD-optimized circuit, high-precision two-step adjustable output overvoltage protection, digital frontier blanking with current sensing, a built-in totem pole gate driver, and DIP-8 and SO-8 packages.
Application Cases:
1. Dismantling report: Anker 100W 2C1A gallium nitride super charge
Summary of the charging head network
The charging head network learned that the emergence of these PFC controllers mentioned in the article and the two-in-one controller of LLC+PFC provides efficient power factor correction and power management solutions for multi-port fast charging equipment at the 100-watt level and above. These state-of-the-art controllers not only correct the power factor and reduce the loss of invalid power, but also simplify the system design, reduce the number of peripheral components, and improve the overall integration and performance stability.
In addition, PFC controllers generally have built-in multiple protection functions to ensure the safety of the charger and the equipment used. As technology continues to evolve and requirements continue to change, PFC controllers will be more widely used in the future, helping to reduce reactive power for charging equipment, reduce the burden on the grid, and help manufacturers easily pass the relevant certifications.
Some of the information in the article comes from the Internet, and is affected by the timeliness of the case, please forgive me if there are any omissions.