CN102427293A - Low output ripple wave parallel power-factor correction (PFC) transform control method and device - Google Patents
Low output ripple wave parallel power-factor correction (PFC) transform control method and device Download PDFInfo
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Abstract
本发明公开了一种低输出纹波的并联功率因数校正变换控制方法及其装置。单相PFC变换器(TD)的输出端与DC/DC变换器(DC-DC)的输出端相并联，同时给负载提供能量；单相PFC变换器输出的正端与DC/DC变换器输出的正端相连接形成“Vo+”端，“Vo+”端同时接在负载的正端；单相PFC变换器输出的负端与DC/DC变换器输出的负端相连接形成“Vo-”端，“Vo-”端同时接在负载的负端；DC/DC变换器的输入电源是辅助电源；辅助电源的输入源可以直接来整流电路(REC)的输出，也可以由单相PFC变换器(TD)产生。本发明消除了传统单相PFC变换器的二倍工频输出纹波，同时提高了系统的动态响应，克服了传统两级功率因数校正变换器效率低、成本高的问题。
The invention discloses a low output ripple parallel power factor correction conversion control method and a device thereof. The output terminal of the single-phase PFC converter (TD) is connected in parallel with the output terminal of the DC/DC converter (DC-DC) to provide energy to the load at the same time; the positive terminal of the output of the single-phase PFC converter is connected to the output terminal of the DC/DC converter The positive terminal of the single-phase PFC converter is connected with the negative terminal of the output of the DC/DC converter to form the "Vo-" terminal. , the "Vo-" terminal is connected to the negative terminal of the load at the same time; the input power of the DC/DC converter is an auxiliary power supply; the input source of the auxiliary power supply can directly come from the output of the rectifier circuit (REC), or it can be provided by a single-phase PFC converter (TD) generated. The invention eliminates the double power frequency output ripple of the traditional single-phase PFC converter, improves the dynamic response of the system at the same time, and overcomes the problems of low efficiency and high cost of the traditional two-stage power factor correction converter.
Description
技术领域 technical field
本发明涉及一种低输出纹波高效率PFC变换器设计方法及其装置。The invention relates to a low output ripple high efficiency PFC converter design method and a device thereof.
背景技术 Background technique
近年来，电力电子技术迅速发展，作为电力电子领域重要组成部分的电源技术逐渐成为应用和研究的热点。开关电源以其效率高、功率密度高而确立了其在电源领域中的主流地位，但其通过整流器接入电网时会存在一个致命的弱点：功率因数较低(一般仅为0.45～0.75)，且在电网中会产生大量的电流谐波和无功功率而污染电网。抑制开关电源产生谐波的方法主要有两种：一是被动法，即采用无源滤波或有源滤波电路来旁路或消除谐波；二是主动法，即设计新一代高性能整流器，它具有输入电流为正弦波、谐波含量低以及功率因数高等特点，即具有功率因数校正功能。开关电源功率因数校正研究的重点，主要是功率因数校正电路拓扑的研究和功率因数校正控制集成电路的开发。现有Buck、Boost、Buck-Boost、反激变换器等多种功率因数校正电路拓扑结构。功率因数校正控制集成电路负责检测变换器的工作状态，并产生脉冲信号控制开关装置，调节传递给负载的能量以稳定输出；同时保证开关电源的输入电流跟踪电网输入电压，实现接近于1的功率因数。控制集成电路的结构和工作原理由开关电源采用的控制方法决定。对于同一功率电路拓扑，采用不同的控制方法会对开关电源的稳态精度及动态性能等方面产生影响。In recent years, power electronics technology has developed rapidly, and power supply technology, which is an important part of the power electronics field, has gradually become a hot spot in application and research. Switching power supply has established its mainstream position in the field of power supply because of its high efficiency and high power density, but there is a fatal weakness when it is connected to the power grid through a rectifier: the power factor is low (generally only 0.45 to 0.75), Moreover, a large number of current harmonics and reactive power will be generated in the grid to pollute the grid. There are two main methods for suppressing harmonics generated by switching power supplies: one is the passive method, that is, using passive filtering or active filtering circuits to bypass or eliminate harmonics; the other is the active method, that is, designing a new generation of high-performance rectifiers, which It has the characteristics of sine wave input current, low harmonic content and high power factor, that is, it has the function of power factor correction. The focus of research on switching power supply power factor correction is mainly the research of power factor correction circuit topology and the development of power factor correction control integrated circuits. Various power factor correction circuit topologies such as Buck, Boost, Buck-Boost, and flyback converter are available. The power factor correction control integrated circuit is responsible for detecting the working state of the converter, and generating a pulse signal to control the switching device, adjusting the energy delivered to the load to stabilize the output; at the same time, it ensures that the input current of the switching power supply tracks the input voltage of the power grid to achieve a power close to 1 factor. The structure and working principle of the control integrated circuit are determined by the control method adopted by the switching power supply. For the same power circuit topology, adopting different control methods will affect the steady-state accuracy and dynamic performance of the switching power supply.
传统的有源功率因数校正变换器直流输出电压/电流包含有二倍工频纹波，若二倍工频输出电压/电流纹波被引入功率因数校正控制器中，会使功率因数校正变换器的输入电流含有三次谐波电流成分，降低了功率因数校正变换器的输入功率因数。因此传统有源功率因数校正变换器的直流输出电压反馈控制环截止频率低(一般仅为10～20Hz)，这严重影响功率因数校正变换器对负载变化的动态响应能力。此外，由于有源功率因数校正变换器的直流输出电压纹波较大，需在功率因数校正变换器输出端接一个电容值很大的输出电容后，还需要再接一个DC/DC变换器来提高负载直流输出电压的稳态精度和对负载变化的动态响应能力，使变换器设计成本高、效率低。The DC output voltage/current of the traditional active power factor correction converter contains double power frequency ripple, if the double power frequency output voltage/current ripple is introduced into the power factor correction controller, it will make the power factor correction converter The input current contains the third harmonic current component, which reduces the input power factor of the power factor correction converter. Therefore, the cut-off frequency of the DC output voltage feedback control loop of the traditional active power factor correction converter is low (generally only 10-20 Hz), which seriously affects the dynamic response capability of the power factor correction converter to load changes. In addition, since the DC output voltage ripple of the active power factor correction converter is relatively large, it is necessary to connect a DC/DC converter to the output terminal of the power factor correction converter after connecting an output capacitor with a large capacitance value. Improving the steady-state accuracy of the load DC output voltage and the dynamic response capability to load changes makes the design cost of the converter high and the efficiency low.
发明内容 Contents of the invention
本发明的目的是提供一种低输出纹波的并联功率因数校正变换控制方法，采用该方法可使单相PFC变换器输出电压/电流纹波减小，并且其动态响应性能好，效率高，抗干扰能力强，适用于各种拓扑结构的单相PFC变换器。The purpose of the present invention is to provide a parallel power factor correction conversion control method with low output ripple, which can reduce the output voltage/current ripple of a single-phase PFC converter, and has good dynamic response performance and high efficiency. Strong anti-interference ability, suitable for single-phase PFC converters with various topological structures.
本发明实现其发明目的，所采用的技术方案是：低输出纹波的并联功率因数校正变换控制方法，其具体作法是：The present invention realizes its object of the invention, and the adopted technical scheme is: the parallel connection power factor correction conversion control method of low output ripple, and its specific practice is:
单相功率因数校正变换器的输出端与DC/DC变换器的输出端相并联，同时给负载提供能量。单相PFC变换器输出的正端与DC/DC变换器输出的正端相连接形成“Vo+”端，“Vo+”端同时接在负载的正端；单相PFC变换器输出的负端与DC/DC变换器输出的负端相连接形成“Vo-”端，“Vo-”端同时接在负载的负端。DC/DC变换器的输入电源是辅助电源，辅助电源的输入源是直接来自整流桥的输出或者由单相PFC变换器产生。当辅助电源的输入源是直接来自整流桥的输出时，辅助源具有功率因数校正的功能。The output terminal of the single-phase power factor correction converter is connected in parallel with the output terminal of the DC/DC converter to provide energy to the load at the same time. The positive terminal of the output of the single-phase PFC converter is connected to the positive terminal of the output of the DC/DC converter to form a "Vo+" terminal, and the "Vo+" terminal is connected to the positive terminal of the load at the same time; the negative terminal of the output of the single-phase PFC converter is connected to the DC The negative terminals output by the /DC converter are connected to form a "Vo-" terminal, and the "Vo-" terminal is connected to the negative terminal of the load at the same time. The input power of the DC/DC converter is an auxiliary power, and the input source of the auxiliary power is directly from the output of the rectifier bridge or generated by a single-phase PFC converter. When the input source of the auxiliary power source is directly from the output of the rectifier bridge, the auxiliary source has the function of power factor correction.
这样，当整个开关电源系统为恒定输出电压的电源时，单相PFC变换器和DC/DC变换器使用同样的输出电压采样电路，此输出电压采样电路检测负载两端的电压；当整个开关电源系统为恒定输出电流的电源时，单相PFC变换器和DC/DC变换器使用不同的输出电流采样电路，两个变换器的输出电流采样电路串联后再与负载相串联，单相PFC变换器的输出电流同时流过两个输出电流采样电路和负载，DC/DC变换器(DC-DC)的输出电流只流过自身的电流采样电路和负载。单相功率因数校正变换器采用经典的PFC控制策略(峰值电流模式控制、平均电流模式控制、电压模式控制)得到功率因数校正变换器的控制信号。由于经典的功率因数校正控制环路带宽很低，单相功率因数校正变换器的输出能量有很大的二倍工频脉动，DC/DC变换器的输出与单相PFC变换器的输出相并联，采用DC/DC变换器高带宽的控制环路，使DC/DC变换器的输出能量将补偿PFC变换器输出能量的二倍工频脉动，从而消除了传统单相PFC变换器的二倍工频输出纹波，使开关电源系统实现低输出电压/电流纹波。In this way, when the entire switching power supply system is a power supply with constant output voltage, the single-phase PFC converter and DC/DC converter use the same output voltage sampling circuit, and this output voltage sampling circuit detects the voltage at both ends of the load; when the entire switching power supply system When it is a constant output current power supply, the single-phase PFC converter and the DC/DC converter use different output current sampling circuits. The output current sampling circuits of the two converters are connected in series and then connected in series with the load. The single-phase PFC converter The output current flows through the two output current sampling circuits and the load at the same time, and the output current of the DC/DC converter (DC-DC) only flows through its own current sampling circuit and the load. The single-phase power factor correction converter adopts the classic PFC control strategy (peak current mode control, average current mode control, voltage mode control) to obtain the control signal of the power factor correction converter. Because the bandwidth of the classic power factor correction control loop is very low, the output energy of the single-phase power factor correction converter has a large double power frequency ripple, and the output of the DC/DC converter is connected in parallel with the output of the single-phase PFC converter , using the high-bandwidth control loop of the DC/DC converter, the output energy of the DC/DC converter will compensate the double power frequency ripple of the output energy of the PFC converter, thereby eliminating the double power frequency of the traditional single-phase PFC converter frequency output ripple, enabling switching power supply systems to achieve low output voltage/current ripple.
与现有技术相比，本发明的有益效果是：Compared with prior art, the beneficial effect of the present invention is:
1、相对于已有的功率因数校正变换器，采用本发明的功率因数校正变换器工作于稳态时，有效地减小了负载的直流输出电压/电流纹波，有利于变换器整流滤波电路选用较小的输出电容；2、采用本发明的功率因数校正变换器可提高输出电压反馈控制环的截止频率，负载发生突变时，DC/DC变换器的控制器能够立即响应，使变换器迅速进入新的稳态；3、采用发明的功率因数校正变换器无需后级的DC/DC变换器，仅需要一个小功率的DC/DC变换器补偿纹波，使得大部分输出功率仅通过一级功率变换，提高了整个开关电源变换器整机的效率。1. Compared with the existing power factor correction converter, when the power factor correction converter of the present invention works in a steady state, the DC output voltage/current ripple of the load is effectively reduced, which is beneficial to the rectification and filtering circuit of the converter Select a smaller output capacitor; 2, adopt the power factor correction converter of the present invention to improve the cut-off frequency of the output voltage feedback control loop, and when the load changes suddenly, the controller of the DC/DC converter can respond immediately, so that the converter can quickly Entering into a new steady state; 3. Adopting the invented power factor correction converter does not require a post-stage DC/DC converter, and only needs a low-power DC/DC converter to compensate for ripples, so that most of the output power passes through only one stage Power conversion improves the efficiency of the entire switching power converter.
本发明的另一目的是提供一种实现以上开关电源设计方法的装置。Another object of the present invention is to provide a device for implementing the above switching power supply design method.
本发明实现该装置的技术方案是：低输出纹波的并联功率因数校正变换控制装置，由单相PFC变换器、DC/DC变换器(DC-DC)、整流电路(REC)和辅助电源(AP)组成；单相功率因数校正变换器的输出端与DC/DC变换器的输出端相并联，同时给负载提供能量。单相PFC变换器输出的正端与DC/DC变换器输出的正端相连接形成“Vo+”端，“Vo+”端同时接在负载的正端；单相PFC变换器输出的负端与DC/DC变换器输出的负端相连接形成“Vo-”端，“Vo-”端同时接在负载的负端。DC/DC变换器的输入电源是辅助电源，辅助电源的输入源是直接来自整流桥的输出或者由单相PFC变换器产生。The technical solution for realizing the device in the present invention is: a parallel power factor correction conversion control device with low output ripple, which consists of a single-phase PFC converter, a DC/DC converter (DC-DC), a rectifier circuit (REC) and an auxiliary power supply ( AP) composition; the output terminal of the single-phase power factor correction converter is connected in parallel with the output terminal of the DC/DC converter, and simultaneously provides energy to the load. The positive terminal of the output of the single-phase PFC converter is connected to the positive terminal of the output of the DC/DC converter to form a "Vo+" terminal, and the "Vo+" terminal is connected to the positive terminal of the load at the same time; the negative terminal of the output of the single-phase PFC converter is connected to the DC The negative terminals output by the /DC converter are connected to form a "Vo-" terminal, and the "Vo-" terminal is connected to the negative terminal of the load at the same time. The input power of the DC/DC converter is an auxiliary power, and the input source of the auxiliary power is directly from the output of the rectifier bridge or generated by a single-phase PFC converter.
这样，当辅助电源的输入源是直接来自整流桥的输出时，辅助源具有功率因数校正的功能。当整个开关电源系统为恒定输出电压的电源时，单相PFC变换器和DC/DC变换器使用同样的输出电压采样电路，此输出电压采样电路检测负载两端的电压；当整个开关电源系统为恒定输出电流的电源时，单相PFC变换器和DC/DC变换器使用不同的输出电流采样电路，两个变换器的输出电流采样电路串联后再与负载相串联，单相PFC变换器的输出电流同时流过两个输出电流采样电路和负载，DC/DC变换器(DC-DC)的输出电流只流过自身的电流采样电路和负载。单相功率因数校正变换器的拓扑结构可以采用Boos t变换器、Buck变换器、Buck-Boost变换器、全桥变换器、反激变换器等隔离型与非隔离型PFC变换拓扑；单相功率因数校正变换器采用经典的PFC控制策略(峰值电流模式控制、平均电流模式控制、电压模式控制)得到功率因数校正变换器的控制信号；DC/DC变换器的拓扑结构可以采用Buck变换器、Boost变换器等变换器；DC/DC变换器可以采用峰值电流模式控制、电压模式控制等经典控制方式得到DC/DC变换器的控制信号，DC/DC变换器的环路带宽远高于单相PFC变换器的带宽。In this way, when the input source of the auxiliary power source is directly from the output of the rectifier bridge, the auxiliary source has the function of power factor correction. When the entire switching power supply system is a power supply with constant output voltage, the single-phase PFC converter and DC/DC converter use the same output voltage sampling circuit, and this output voltage sampling circuit detects the voltage at both ends of the load; when the entire switching power supply system is constant When the power supply of the output current, the single-phase PFC converter and the DC/DC converter use different output current sampling circuits, the output current sampling circuits of the two converters are connected in series and then connected in series with the load, the output current of the single-phase PFC converter Simultaneously flow through the two output current sampling circuits and the load, and the output current of the DC/DC converter (DC-DC) only flows through its own current sampling circuit and the load. The topology of the single-phase power factor correction converter can adopt isolated and non-isolated PFC conversion topologies such as Boost converter, Buck converter, Buck-Boost converter, full-bridge converter, and flyback converter; single-phase power The factor correction converter adopts the classic PFC control strategy (peak current mode control, average current mode control, voltage mode control) to obtain the control signal of the power factor correction converter; the topology of the DC/DC converter can adopt Buck converter, Boost Converters such as converters; DC/DC converters can use peak current mode control, voltage mode control and other classic control methods to obtain the control signal of the DC/DC converter, and the loop bandwidth of the DC/DC converter is much higher than that of single-phase PFC converter bandwidth.
可见，采用以上装置可以方便可靠地实现本发明以上方法。It can be seen that the above method of the present invention can be realized conveniently and reliably by using the above device.
下面结合附图和具体实施方式对本发明作进一步详细的说明。The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.
附图说明 Description of drawings
图1为本发明的系统结构框图。Fig. 1 is a system structure block diagram of the present invention.
图2为本发明实施例一的电路结构示意图。FIG. 2 is a schematic diagram of the circuit structure of
图3为本发明实施例一的输入电流和输入电压关系的仿真结果图。FIG. 3 is a simulation result diagram of the relationship between input current and input voltage according to
图4为本发明实施例一的输出电流波形。FIG. 4 is an output current waveform of
图5为本发明实施例二的电路结构示意图。FIG. 5 is a schematic diagram of the circuit structure of Embodiment 2 of the present invention.
具体实施方式 Detailed ways
实施案例Implementation case
图2示出，本发明的一种具体实施方式为，一种恒流源开关电源的拓扑结构和控制方法，其具体作法是：Figure 2 shows that a specific embodiment of the present invention is a topology and control method of a constant current source switching power supply, and its specific method is:
交流输入电源经过C1、C2、L1、L2的LC滤波网络连接在由D1、D2、D3、D4组成的整流桥上，整流桥输出VREC信号作为反激变换器的输入，反激变换器的变压器T1有4个绕组N12，N34，N56和N78，N12是原边绕组；N34是给反激功率因数控制器提供电源的辅助绕组，经过D5，C4生成VDD电压给反激功率因数控制器提供电源；N56是反激变换器的主输出绕组，N56绕组经过D6，C5生成Vo+给负载提供一部分能量；N78是反激变换器的另一组输出绕组，N78经过D7和C7生成辅助电源VAUX，辅助电源VAUX给后级小功率DC/DC Buck变换器提供能量。DC/DC Buck变换器由Q2、D8、L3、C6和Buck变换器控制器组成，DC/DC Buck变换器将辅助电源VAUX转变为Vo，给负载提供另一部分能量。R3采样反激功率因数校正变换器给负载提供的电流，转化为VFB-F电压信号，反激功率因数校正变换器控制器将VFB-F作为反馈信号与控制器内部的基准信号相比较，运用经典的峰值电流控制或者电压模式控制等控制方法，并且控制反激变换器工作在断续模式或者临界连续模式，环路的带宽控制在20Hz以内，以此实现功率因数校正功能。R2采样流过负载的电流，转化为VFB信号，包括Buck变换器和反激变换器提供给负载的电流，Buck变换器用VFB信号作为控制的反馈信号与Buck控制器内部的基准信号比较，运用经典的峰值电流控制或者电压模式控制等控制方法，环路的带宽远大于工频的频率，以此提高整个恒流源开关电源的响应速度，消除流过负载的工频电流纹波。The AC input power is connected to the rectifier bridge composed of D1, D2, D3, and D4 through the LC filter network of C1, C2, L1, and L2. The rectifier bridge outputs the VREC signal as the input of the flyback converter, and the transformer of the flyback converter T1 has 4 windings N12, N34, N56 and N78, N12 is the primary winding; N34 is the auxiliary winding that provides power to the flyback power factor controller, through D5, C4 generates VDD voltage to provide power to the flyback power factor controller ; N56 is the main output winding of the flyback converter, N56 winding passes through D6, C5 generates Vo+ to provide part of the energy for the load; N78 is another set of output windings of the flyback converter, N78 generates auxiliary power VAUX through D7 and C7, auxiliary The power supply VAUX provides energy to the low-power DC/DC Buck converter in the subsequent stage. The DC/DC Buck converter is composed of Q2, D8, L3, C6 and Buck converter controller. The DC/DC Buck converter converts the auxiliary power VAUX into Vo to provide another part of energy to the load. R3 samples the current provided by the flyback power factor correction converter to the load, and converts it into a VFB-F voltage signal. The flyback power factor correction converter controller uses VFB-F as a feedback signal to compare with the reference signal inside the controller. Classical control methods such as peak current control or voltage mode control, and control the flyback converter to work in discontinuous mode or critical continuous mode, and the loop bandwidth is controlled within 20Hz, so as to realize the power factor correction function. R2 samples the current flowing through the load and converts it into a VFB signal, including the current supplied to the load by the Buck converter and the flyback converter. The Buck converter uses the VFB signal as the feedback signal for control and compares it with the internal reference signal of the Buck controller. Peak current control or voltage mode control and other control methods, the bandwidth of the loop is much larger than the frequency of the power frequency, so as to improve the response speed of the entire constant current source switching power supply and eliminate the power frequency current ripple flowing through the load.
图3和图4是利用SIMetrix/SIMPLIS仿真软件得到的仿真波形。从图3可以看到输入电流很好的跟踪了输入电压的波形，该电源具有很高的功率因数。从图4可以看出流过负载的电流平均值被精确的控制在1A，且电流纹波为3.9mA。Figure 3 and Figure 4 are simulation waveforms obtained by using SIMetrix/SIMPLIS simulation software. It can be seen from Figure 3 that the input current tracks the waveform of the input voltage very well, and the power supply has a very high power factor. It can be seen from Figure 4 that the average value of the current flowing through the load is precisely controlled at 1A, and the current ripple is 3.9mA.
图5示出，本发明的一种具体实施方式为，一种恒流源开关电源的拓扑结构和控制方法，其具体作法是：Figure 5 shows that a specific embodiment of the present invention is a topology and control method of a constant current source switching power supply, and its specific method is:
交流输入电源经过C1、C2、L1、L2的LC滤波网络连接在由D1、D2、D3、D4组成的整流桥上，整流桥输出VREC信号作为反激变换器的输入，变压器T1有3个绕组N12，N34和N56，N12绕组作为Buck-Boost的电感使用，N12经过D6，C4生成Vo+给负载提供一部分能量；N34经过D5，C7生成辅助电源VAUX，辅助电源VAUX给后级小功率DC/DC Boost变换器提供能量；N56经过D8，C6生成VDD电压给Buck-Boost功率因数控制器提供电源。DC/DC Boost变换器由L3，Q2，D7和Boost变换器控制器组成，DC/DC Boost变换器将辅助电源VAUX转变为Vo，给负载提供另一部分能量。R3采样Buck-Boost功率因数校正变换器给负载提供的电流，经过采样变换电路，转化为VFB-Main电压信号，Buck-Boost功率因数校正变换器控制器将VFB-Main作为反馈信号与控制器内部的基准信号相比较，运用经典的峰值电流控制或者电压模式控制等控制方法，并且控制Buck-Boost变换器工作在断续模式或者临界连续模式，环路的带宽控制在20Hz以内，以此实现功率因数校正功能。R2采样流过负载的电流，转化为VFB_Aux信号，包括Boost变换器和Buck-Boost变换器提供给负载的电流，Boost变换器用VFB_Aux信号作为控制的反馈信号与Boost控制器内部的基准信号比较，运用经典的峰值电流控制或者电压模式控制等控制方法，环路的带宽远大于工频的频率，以此提高整个恒流源开关电源的响应速度，消除流过负载的工频电流纹波。The AC input power is connected to the rectifier bridge composed of D1, D2, D3, and D4 through the LC filter network of C1, C2, L1, and L2. The rectifier bridge outputs the VREC signal as the input of the flyback converter. The transformer T1 has 3 windings N12, N34 and N56, N12 windings are used as Buck-Boost inductance, N12 passes through D6, C4 generates Vo+ to provide part of the energy for the load; N34 passes through D5, C7 generates auxiliary power VAUX, and the auxiliary power VAUX supplies low-power DC/DC to the subsequent stage The Boost converter provides energy; N56 passes through D8, and C6 generates VDD voltage to provide power to the Buck-Boost power factor controller. The DC/DC Boost converter is composed of L3, Q2, D7 and the Boost converter controller. The DC/DC Boost converter converts the auxiliary power VAUX into Vo to provide another part of energy to the load. R3 samples the current provided by the Buck-Boost power factor correction converter to the load, and converts it into a VFB-Main voltage signal through the sampling conversion circuit. The Buck-Boost power factor correction converter controller uses VFB-Main as a feedback signal and communicates with the controller internally Compared with the reference signal, the classic peak current control or voltage mode control and other control methods are used, and the Buck-Boost converter is controlled to work in discontinuous mode or critical continuous mode. The bandwidth of the loop is controlled within 20Hz, so as to realize the power Factor correction function. R2 samples the current flowing through the load and converts it into a VFB_Aux signal, including the current provided by the Boost converter and the Buck-Boost converter to the load. The Boost converter uses the VFB_Aux signal as the control feedback signal to compare with the reference signal inside the Boost controller. In classic control methods such as peak current control or voltage mode control, the bandwidth of the loop is much larger than the frequency of the power frequency, so as to improve the response speed of the entire constant current source switching power supply and eliminate the power frequency current ripple flowing through the load.
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