Method and equipment for controlling PFC (Power Factor Correction)

Abstract

There is presented a method of controlling a power factor corrector (PFC) configured to receive input power and supply power to a load via a DC / DC converter, the method being performed by a PFC controller configured to control the PFC, where the PFC controller includes a voltage controller, the method comprising: receiving a first signal sent from a DC / DC controller configured to control the DC / DC converter, the first signal indicates the load; deriving a second signal based on the first signal, where the second signal is an expected output control signal of the voltage controller at a load indicated by the first signal; and configuring the voltage controller according to the second signal, so that the output voltage VBulk of the PFC to the DC / DC converter is kept stable.

Description

Technical Field

[0001] The present disclosure relates to methods and apparatus for controlling a power factor corrector (PFC). Background Art

[0002] A power factor corrector (PFC) is usually used as a front-end converter, which ensures that the power supply unit has a high power factor and low input current distortion (good iTHD (input current total harmonic distortion)). Figure 1 1 is a schematic diagram showing a power supply unit with conventional PFC control, wherein the power supply unit may include a PFC 101, a PFC controller 103, a DC / DC converter 105, and a DC / DC controller 107. The PFC 101 may receive input power and supply power to a load via the DC / DC converter 105, and the PFC 101 may be controlled by the PFC controller 103, and the DC / DC converter 105 may be controlled by the DC / DC controller 107. PFC control generally involves two control loops, such as Figure 1 The inner control loop is a fast-responding input current control loop that shapes the input current to match the input sinusoidal waveform. This ensures that the input current meets the low iTHD requirement. The outer control loop is a slow-responding PFC output voltage control loop that regulates the output to the desired voltage (determined by the reference signal V ref The voltage control loop outputs the control signal VCL op , which adjusts the reference current signal I ref , so that the input current can be controlled. Then adjust VCL op The signal can change the input power of PFC and make the PFC output voltage V Bulk The PFC control is well known to those skilled in the art and will not be described in detail here.

[0003] Theoretically, the PFC output voltage V Bulk The output voltage ripple should be 2 times the line frequency. This is because the input voltage and current are AC rectified at 2 times the line frequency, and the charging and discharging of the PFC output capacitors in each ac half cycle creates a voltage ripple. The voltage control loop response should be slow so that it will not respond to V Bulk This means that the bandwidth of the voltage control loop must be much lower than 2 times the input line frequency. If the voltage control loop responds too fast, the control output VCL op will change continuously within half an AC input cycle. This will cause I ref The signal is distorted and affects the iTHD and power factor of the PFC.

[0004] Good output dynamic load response is a common requirement for DC / DC converter 105. Some computer systems even require a 5% to 100% step load change within milliseconds with an output voltage drop of less than 1%. Good dynamic load response depends on the DC / DC controller 107 and V bulk When a high step load occurs in the DC / DC converter output, the PFC output will also experience a high step load, which will cause a high V bulk Overshoot or undershoot.

[0005] Figure 2A and Figure 2B Figure 2 shows the voltage V when the DC / DC converter output experiences a high step load (Iout changes from 20A to 70A). bulk The undershoot diagram. Figure 3A and Figure 3B Figure 2 shows the V output when the DC / DC converter output experiences a high step load (Iout changes from 70A to 20A). bulk The overshoot diagram of . Figure 2B and Figure 3B They are Figure 2A and Figure 3A The scale is shown in a 5-fold magnified version. It can be seen that V bulk There is a large undershoot and overshoot, which reaches the protection threshold, which limits V bulk Further decrease or increase occurs from 20A to 70A and from 70A to 20A respectively.

[0006] V bulk The large undershoot and overshoot of V undermine its stability, thereby affecting the output dynamic load response of the DC / DC converter 105. Therefore, it is necessary to provide an effective method to maintain V when the DC / DC converter output experiences a high step load. bulk Stablize. Summary of the invention

[0007] The present disclosure proposes a method to eliminate V when a DC / DC converter output experiences a high step load. bulk Method and apparatus for overshoot or undershoot.

[0008] Aspects of the present disclosure provide a method of controlling a PFC, wherein the PFC is configured to receive input power and supply power to a load via a DC / DC converter, the method being performed by a PFC controller configured to control the PFC, wherein the PFC controller includes a voltage controller.

[0009] The method comprises: receiving a first signal sent from a DC / DC controller configured to control the DC / DC converter, the first signal indicating the load; deriving a second signal based on the first signal, wherein the second signal is an expected output control signal of the voltage controller under the load indicated by the first signal; and configuring the voltage controller according to the second signal so that the output voltage V of the PFC to the DC / DC converter is Bulk Stay steady.

[0010] According to an embodiment of the present disclosure, the voltage controller may be configured to generate an output control signal VCL op , wherein configuring the voltage controller according to the second signal comprises: selectively configuring the voltage controller based on the second signal based on a reference voltage signal and an output voltage V of the PFC Bulk The output control signal VCL is generated by the difference op , or the output control signal VCL op is set equal to the second signal.

[0011] According to an embodiment of the present disclosure, the PFC controller may further include a current controller, which may be configured to receive a product of a reference current signal and K and a current I of the PFC. PFC The difference between the two is used as the input, making the PFC current I PFC is controlled to be equal to the product of the reference current signal and K, where K can be a constant scaling factor.

[0012] According to an embodiment of the present disclosure, the first signal may be the output power P of the DC / DC converter. out .

[0013] According to an embodiment of the present disclosure, deriving the second signal may include: out The second signal is obtained by dividing by the product of efficiency η and K, wherein efficiency η may represent the efficiency of supplying power to the load from the input power, and wherein K may be a constant scaling factor, and the current I of the PFC PFC is controlled to be equal to the product of the reference current signal and K.

[0014] According to an embodiment of the present disclosure, if there is no root mean square RMS filter in the PFC controller, the output power P out Divide the input voltage V in The second signal is obtained by multiplying the square of the root mean square value of, the efficiency η and K.

[0015] According to an embodiment of the present disclosure, configuring the voltage controller according to the second signal may include: when the second signal is equal to the output control signal VCL op When the absolute value of the difference is greater than the threshold, the output control signal VCL op The voltage controller is set equal to the second signal and the relevant state variables of the voltage controller are changed at the same time so that the voltage controller jumps to a state matching the new input power.

[0016] According to an embodiment of the present disclosure, the threshold value may be the output control signal VCL op A specific percentage of the value at steady state full load.

[0017] According to an embodiment of the present disclosure, the voltage controller may be implemented using proportional integral and differential PID control, and configuring the voltage controller according to the second signal may include: when the absolute value of the difference is less than or equal to the threshold, the output control signal VCL op is the sum of the proportional variable, the integral variable and the differential variable, and when the absolute value of the difference is greater than the threshold, the output control signal VCL is op is set equal to the second signal, while setting the integrated variable equal to the second signal.

[0018] According to an embodiment of the present disclosure, receiving the first signal sent from the DC / DC controller includes: receiving the first signal sent from the DC / DC controller via a signal transmitter when a safety isolation barrier exists between the PFC controller and the DC / DC controller.

[0019] According to an embodiment of the present disclosure, the first signal is transmitted in digital form, and the transmission, encoding and decoding are completed within half a millisecond.

[0020] Aspects of the present disclosure also provide a PFC controller for controlling a PFC, wherein the PFC may be configured to receive input power and supply power to a load via a DC / DC converter, wherein the PFC controller may include a voltage controller and is configured to: receive a first signal from a DC / DC controller, wherein the first signal indicates the load; derive a second signal based on the first signal, wherein the second signal is an expected output control signal of the voltage controller under the load indicated by the first signal; and configure the voltage controller according to the second signal so that an output voltage V of the PFC to the DC / DC converter is Bulk Stay steady.

[0021] Aspects of the present disclosure also provide a power supply device, comprising: a DC / DC converter; a power factor corrector PFC, configured to receive input power and supply power to a load via the DC / DC converter; a DC / DC controller, configured to control the DC / DC converter and send a first signal to the PFC controller; and a PFC controller, configured to control the PFC and perform the following operations: receiving the first signal from the DC / DC controller, the first signal indicating the load; deriving a second signal based on the first signal, wherein the second signal is an expected output control signal of a voltage controller included in the PFC controller under the load indicated by the first signal; and configuring the voltage controller according to the second signal so that the output voltage V Bulk Stay steady.

[0022] According to the embodiments disclosed herein, a stable V bulk Improved V of DC / DC converter out Dynamic response. At the same time, keep the PFC voltage control loop response slow so that the input power factor and iTHD performance are not affected. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Other objects, features and advantages will become apparent from the following detailed description of embodiments made with reference to the accompanying drawings.

[0024] Figure 1 is a schematic diagram showing a power supply unit with conventional PFC control;

[0025] Figure 2A and Figure 2B Figure 2 shows the voltage V when the DC / DC converter output experiences a high step load (Iout changes from 20A to 70A). bulk The undershoot graph;

[0026] Figure 3A and Figure 3B Figure 2 shows the V output when the DC / DC converter output experiences a high step load (Iout changes from 70A to 20A). bulk The overshoot diagram;

[0027] Figure 4 is a schematic diagram showing a power supply unit with PFC control according to an embodiment of the present disclosure;

[0028] Figure 5 is a flowchart showing a method for controlling PFC performed by a PFC controller according to an embodiment of the present disclosure;

[0029] Fig. 6A and Figure 6Band V when the DC / DC converter output experiences a high step load under the control of the PFC controller according to an embodiment of the present disclosure. bulk changes; and

[0030] Figure 7 A PFC controller according to an embodiment of the present disclosure is shown. DETAILED DESCRIPTION

[0031] Hereinafter, embodiments of the present disclosure will be described with reference to the accompanying drawings. However, it should be understood that these descriptions are exemplary only and are not intended to limit the scope of the present disclosure. In addition, in the following description, descriptions of well-known structures and technologies are omitted to avoid unnecessary confusion of the concepts of the present disclosure.

[0032] The terms used herein are only for describing specific embodiments and are not intended to limit the present disclosure. The words "a", "an (kind)" and "the" used herein should also include the meanings of "multiple" and "multiple", unless the context clearly indicates otherwise. In addition, the terms "including", "comprising" and the like used herein indicate the presence of the features, steps, operations and / or components, but do not exclude the presence or addition of one or more other features, steps, operations or components.

[0033] All terms (including technical and scientific terms) used herein have the meanings commonly understood by those skilled in the art, unless otherwise defined. It should be noted that the terms used herein should be interpreted as having a meaning consistent with the context of this specification, and should not be interpreted in an idealized or overly rigid manner.

[0034] As mentioned earlier, good output dynamic load response is a common requirement for DC / DC converters. Some computer systems even require a 5% to 100% step load change within milliseconds with an output voltage drop of less than 1%. Good dynamic load response depends on the DC / DC controller and V bulk When a high step load occurs in the DC / DC converter output, the PFC output will also experience a high step load, which will cause a high V bulk Overshoot or undershoot.

[0035] In order to solve the above problems, the present application proposes a concept for implementing output control of PFC through a feedforward function. Figure 4 is a schematic diagram showing a power supply unit with PFC control according to an embodiment of the present disclosure.

[0036] The voltage unit may include a PFC 401, a PFC controller 403, a DC / DC converter 405, and a DC / DC controller 407. The PFC 401 may generally be connected to the DC / DC converter 405, and may receive input power and supply power to a load via the DC / DC converter 405. The PFC controller 403 may include a voltage controller. In addition, the DC / DC converter 405 may generally have a safety isolation barrier. However, the inventive concept is applicable regardless of whether the safety isolation barrier exists.

[0037] According to an embodiment of the present disclosure, the PFC controller 403 may further include a current controller. The current controller may be configured to receive the product of the reference current signal and K and the current I PFC The difference between the two is used as the input, so that the current I PFC Can be controlled to be equal to the product of the reference current signal and K. In this embodiment, K can be a constant scaling factor and a positive number, and depending on the scaling, K can be greater than or less than 1.

[0038] According to an embodiment of the present disclosure, the DC / DC controller 407 can obtain V out and I out The signal is used for control purposes so that it can send additional P to the PFC controller 403. out signal (if assuming V out unchanged, it can also be I out However, the present disclosure is not limited thereto, and the DC / DC controller 407 may send other signals to the PFC controller 403, as long as these other signals enable the PFC controller 403 to achieve V when the DC / DC converter output experiences a high step load. bulk Just be stable.

[0039] In order to make V bulk It responds quickly to changes in output load, P out The transmission should be fast. The DC / DC controller 407 preferably outputs a continuous analog P out The signal is transmitted and input to the PFC controller 403. If there is a safety isolation barrier between the two controllers, some high-speed analog signal transmission equipment with input / output isolation should be used.

[0040] Therefore, according to an embodiment of the present disclosure, the voltage unit may also include a signal transmitter 409. This may be an advanced isolated analog signal transmitter, or use a high frequency pwm (pulse width modulation) signal together with an optical or magnetic isolator.

[0041] The latter will P out The signal is converted into a high-frequency PWM signal (for example, the duty cycle and P outThe PWM signal is transmitted to the PFC controller through an optocoupler or signal transformer and then filtered back to an analog signal. out Signals can also be transmitted in digital form, but the transmission, encoding and decoding speeds must be fast enough (for example, within half a millisecond).

[0042] The following will refer to Figure 5 The method performed by the PFC controller 403 is described below.

[0043] Figure 5 is a flow chart illustrating a method 500 for controlling PFC performed by a PFC controller according to an embodiment of the present disclosure.

[0044] At S502, a first signal sent from a DC / DC controller may be received. The first signal may indicate a load.

[0045] In an embodiment of the present disclosure, the first signal may be the output power P of the power supply unit. out In this embodiment, in the case where there is a safety isolation barrier between the PFC controller and the DC / DC controller, the first signal may be received from the DC / DC controller via the signal transmitter as described above.

[0046] At S504, based on the first signal (eg, output power P out ) to derive the second signal. In an embodiment of the present disclosure, the second signal may be an expected output control signal of the voltage controller under the load indicated by the first signal.

[0047] Return to reference Figure 4 , the PFC controller 403 receives the P sent by the DC / DC controller 407 out Afterwards, the Vc signal (i.e., the second signal) can be calculated, which is equal to the expected VCL after the load change op Signal. New VCL op Signal increase / decrease I ref , so that the PFC input current can be adjusted to the expected amplitude in a short time. The specific calculation process of the Vc signal will be described below.

[0048] In this embodiment, let η be the efficiency of the power supply unit. The efficiency η may represent the efficiency of supplying power to the load from the input power, that is:

[0049] P in =P out / η(Equation 1)

[0050] Among them, P in is the input power of the power supply unit, P out is the output power of the power supply unit.

[0051] In addition, the PFC current I PFC can be controlled by the above current controller to be the same as the reference current I ref The following equation is satisfied:

[0052] I PFC =K x I ref ,

[0053] Where K may be a constant scaling factor and is a positive number, and may be greater than, equal to, or less than 1 depending on the scaling.

[0054] The input power of the power supply unit (P in =V in(rms) x I PFC(rms) ) can therefore be calculated by the following equation:

[0055] P in =V in(rms) x K x I ref(rms) (Equation 2)

[0056] The subscript rms can represent the root mean square value of the variable, for example, V in(rms) It can represent V in The root mean square value of .

[0057] In addition, according to an embodiment of the present disclosure, Vc can be used as a substitute for the normal voltage controller output VCL op A signal such as Figure 4 In the example shown, Vc should be equal to the reference current I ref With the following relationship:

[0058] I ref =Vc x V in / V in(rms) 2

[0059] I ref(rms) =Vc x V in(rms) / V in(rms) 2

[0060] Therefore, I ref(rms) Can be exported as follows:

[0061] I ref(rms) =Vc / V in(rms) (Equation 3)

[0062] By combining equations 1, 2, and 3, the following equation can be derived:

[0063] Vc=P out / (ηx K)

[0064] Therefore, in this embodiment, deriving the second signal may include: out The second signal is obtained by dividing by the product of the efficiency η and K.

[0065] However, the present disclosure is not limited thereto, and for other methods for calculating I ref The same concept still applies to PFC controllers with different output currents. For example, if there is no Rms filter in the PFC controller, then:

[0066] I ref =Vc x V in

[0067] I ref(rms) =Vc x V in(rms) (Equation 3a)

[0068] By combining equations 1, 2, and 3a, the following equation can be derived:

[0069] Vc=P out / (ηx K x V in(rms) 2 )

[0070] Therefore, according to an embodiment of the present disclosure, if there is no RMS filter in the PFC controller, the output power P out Divide by the input voltage V in The second signal is obtained by multiplying the square of the root mean square value of, the efficiency η and K.

[0071] Back to Figure 5 At S506, the voltage controller can be configured according to the second signal so that the output voltage V of the PFC to the DC / DC converter is Bulk Stay steady.

[0072] According to an embodiment of the present disclosure, the voltage controller may be configured to generate an output control signal VCL op In this embodiment, configuring the voltage controller according to the second signal may include: selectively configuring the voltage controller based on the second signal and the output voltage V of the PFC Bulk The difference is used to generate the output control signal VCL op , or output control signal VCL op Set equal to the second signal.

[0073] When the PFC controller receives the P out signal, it can choose whether to use Vc or VCL op To calculate I refTo avoid disturbing the normal operation of PFC under steady-state load, it is recommended to replace VCL with Vc only when the difference between the two values ​​is large. op For example, if even without this new P out The feed-forward function of the power supply output dynamic load also performs well at a 20% load step (of full load), but when it exceeds a 20% load step, due to V bulk The large overshoot / undershoot of the PFC controller makes the dynamic load of the power supply output worse. Then the PFC controller can set VCL op Equal to Vc.

[0074] Therefore, according to an embodiment of the present disclosure, configuring the voltage controller according to the second signal (ie, the Vc signal) may include: when the second signal is equal to the output control signal VCL of the voltage controller, op When the absolute value of the difference is greater than the threshold, the control signal VCL will be output op Set to be equal to the second signal. The threshold can be the output control signal VCL op A certain percentage of the value at steady-state full load. In this embodiment, the threshold value may be VCL op 20% of the value at steady-state full load. It should be noted that "20% of full load" is only a reference suggestion and the present disclosure is not limited thereto. The standard for applying Vc may depend on various applications, and different standards should be included in the present invention.

[0075] It can be assumed that the voltage control loop is implemented using PID (Proportional Integral and Derivative) control. However, the present disclosure is not limited thereto, and the present invention is also applicable to different types of controllers.

[0076] The following will describe in detail how to configure the voltage controller according to the Vc signal in the case of PID control.

[0077] PID algorithm refers to proportional, integral, and derivative control, which is a common "keep stable" control algorithm. Conventional PID control may involve proportional variables, integral variables, and derivative variables.

[0078] Proportional variable (n) = K p x V err (n), where K p is the proportional gain. Figure 4 As shown, V err It is through V ref -V bulk Calculated voltage error signal.

[0079] Integration variable (n) = Integration variable (n-1) + K i x V err (n), where K i is the integral gain.

[0080] Differential variable (n) = K d (V err (n)–V err (n-1)), where K d is the differential gain.

[0081] Therefore, when abs(VCL op –Vc)≤VCL op_FL x 20%, where VCL op_FL Can be VCL at full load in steady state op value:

[0082] VCL op = proportional variable + integral variable + differential variable.

[0083] When abs(VCL op –Vc)>VCL op_FL x 20%:

[0084] VCL op =Vc, integral variable =Vc.

[0085] The purpose of updating the integral variable can be to cause the voltage controller to jump to a state that matches the latest input power. It can then continue to operate in this state without waiting for the slow integral term to change to the expected value (e.g., V after applying Vc). err will approach zero).

[0086] For controllers other than PID controllers, it may also be necessary to change the relevant state variables so that the voltage controller jumps to a state that matches the latest input power.

[0087] Therefore, according to an embodiment of the present disclosure, when the output control signal VCL is op When set equal to the second signal, the relevant state variables of the voltage controller can be changed simultaneously to make the voltage controller jump to a state matching the latest input power.

[0088] Therefore, as described above, the PFC controller according to the embodiment performing method 500 can eliminate V when the DC / DC converter output experiences a high step load. bulk Overshoot or undershoot. Stable V bulk Improved V of DC / DC converter out Dynamic response. At the same time, keep the PFC voltage control loop response slow so that the input power factor and iTHD performance are not affected.

[0089] Fig. 6A and Figure 6Band V when the DC / DC converter output experiences a high step load under the control of the PFC controller according to an embodiment of the present disclosure. bulk As can be seen from the figure, when Iout changes from 20A to 120A and from 120A to 20A, V bulk There is no undershoot or overshoot during the load step, thus achieving V bulk stability.

[0090] Figure 7 FIG. 7 shows a PFC controller 700 according to an embodiment of the present disclosure. The PFC controller 700 can be used to Figure 4 The PFC controller 700 may include a current controller 710 and a voltage controller 720, as shown in the figure. The PFC controller 700 may be configured to perform the Figure 5 Describes the operation.

[0091] Example embodiments are described herein with reference to block diagrams and / or flowchart illustrations of computer-implemented methods, devices (systems and / or equipment), and / or computer program products. It should be understood that the blocks of the block diagrams and / or flowchart illustrations and the combination of blocks in the block diagrams and / or flowchart illustrations can be implemented by computer program instructions executed by one or more computer circuits. These computer program instructions can be provided to processor circuits of general-purpose computer circuits, special-purpose computer circuits, and / or other programmable data processing circuits to produce a machine, so that instructions executed by processors of computers and / or other programmable data processing devices convert and control transistors, values ​​stored in memory locations, and other hardware components within such circuits to implement the functions / actions specified in the block diagrams and / or flowcharts, and thereby create a device (functional body) and / or structure for implementing the functions / actions specified in the block diagrams and / or flowcharts.

[0092] These computer program instructions may also be stored in a tangible computer-readable medium that can direct a computer or other programmable data processing device to act in a specific manner so that the instructions stored in the computer-readable medium produce an article of manufacture, the article of manufacture including instructions for implementing the functions / actions specified in the blocks of the block diagram and / or flow chart. Therefore, embodiments of the present invention may be implemented in hardware and / or in software (including firmware, resident software, microcode, etc.) running on a processor such as a digital signal processor, which may be collectively referred to as a "circuit," "module," or variations thereof.

[0093] References in this disclosure to "one embodiment," "an embodiment," etc. indicate that the described embodiment may include a particular feature, structure, or characteristic, but not every embodiment must include the particular feature, structure, or characteristic. Furthermore, these phrases do not necessarily refer to the same embodiment. Furthermore, when a particular feature, structure, or characteristic is described in conjunction with an embodiment, it should be considered that it is within the knowledge of those skilled in the art to implement such feature, structure, or characteristic in conjunction with other embodiments (whether or not explicitly described).

[0094] It should be understood that although the terms "first", "second", etc. may be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish elements from each other. For example, without departing from the scope of the present disclosure, a first element may be referred to as a second element, and similarly, a second element may be referred to as a first element. As used herein, the term "and / or" includes any and all combinations of one or more of the related listed items.

[0095] Under the premise of not departing from the principle of the inventive concept basically, many changes and modifications can be made to the embodiment. All these changes and modifications are intended to be included in the scope of the inventive concept herein. Therefore, the above-mentioned subject matter should be understood as exemplary and not restrictive, and the examples of the embodiments are intended to cover all these modifications, improvements and other embodiments that fall within the spirit and scope of the inventive concept. Therefore, to the maximum extent permitted by law, the scope of the inventive concept should be determined by the widest permissible interpretation of the present disclosure including the examples of the embodiments and their equivalents, and should not be limited to or restricted to the previous specific embodiments.

Claims

1. A method for controlling a power factor corrector PFC, wherein: The PFC is configured to receive input power and supply power to a load via a DC / DC converter, the method is performed by a PFC controller configured to control the PFC, wherein the PFC controller includes a voltage controller, and the method includes: receiving a first signal sent from a DC / DC controller configured to control the DC / DC converter, the first signal indicating the load; deriving a second signal based on the first signal, wherein the second signal is an expected output control signal of the voltage controller under the load indicated by the first signal; and The voltage controller is configured according to the second signal so that the output voltage V of the PFC to the DC / DC converter is Bulk Stay steady.

2. The method according to claim 1, wherein: The voltage controller is configured to generate an output control signal VCL op , Wherein, configuring the voltage controller according to the second signal comprises: based on the second signal, selectively based on a reference voltage signal and an output voltage V of the PFC Bulk The output control signal VCL is generated by the difference op , or the output control signal VCL op is set equal to the second signal.

3. The method according to claim 2, wherein: The PFC controller further includes a current controller configured to receive a product of a reference current signal and K and a current I PFC The difference is used as input, making the PFC current I PFC is controlled to be equal to the product of the reference current signal and K, where K is a constant scaling factor.

4. The method according to claim 1, wherein: The first signal is the output power P of the DC / DC converter out .

5. The method according to claim 4, wherein: Deriving the second signal comprises: By converting the output power P out Divide by the product of the efficiency η and K to obtain the second signal, Wherein, efficiency η represents the efficiency of supplying power from the input power to the load, Where K is a constant scaling factor, and the PFC current I PFC is controlled to be equal to the product of the reference current signal and K, and The reference current signal is based on the output control signal VCL of the voltage controller. op and the PFC input voltage V in To obtain.

6. The method according to claim 5, wherein: If there is no RMS filter in the PFC controller, then by setting the output power P out Divide the input voltage V in The second signal is obtained by multiplying the square of the root mean square value of, the efficiency η and K.

7. The method according to claim 2, wherein: Configuring the voltage controller according to the second signal comprises: When the second signal is equal to the output control signal VCL op When the absolute value of the difference is greater than the threshold, the output control signal VCL op The voltage controller is set equal to the second signal and the relevant state variables of the voltage controller are changed at the same time so that the voltage controller jumps to a state matching the new input power.

8. The method according to claim 7, wherein: The threshold is the output control signal VCL op A specific percentage of the value at steady state full load.

9. The method according to claim 7, wherein: The voltage controller is implemented using proportional integral and derivative PID control, and configuring the voltage controller according to the second signal includes: When the absolute value of the difference is less than or equal to the threshold, the output control signal VCL op is the sum of the proportional, integral, and differential variables, and When the absolute value of the difference is greater than the threshold, the output control signal VCL is op is set equal to the second signal, while setting the integrated variable equal to the second signal.

10. The method according to claim 1, wherein: Receiving the first signal sent from the DC / DC controller includes: In a case where a safety isolation barrier exists between the PFC controller and the DC / DC controller, the first signal transmitted from the DC / DC controller is received via a signal transmitter.

11. The method according to claim 1, wherein: The first signal is transmitted in digital form, and the transmission, encoding and decoding are completed within half a millisecond.

12. A power factor corrector (PFC) controller for controlling a PFC, wherein the PFC is configured to receive input power and supply power to a load via a DC / DC converter, wherein the PFC controller comprises a voltage controller and is configured to: receiving a first signal from a DC / DC controller, the first signal indicating the load; A second signal is derived based on the first signal, wherein The second signal is an expected output control signal of the voltage controller under the load indicated by the first signal; as well as The voltage controller is configured according to the second signal so that the output voltage V of the PFC to the DC / DC converter is Bulk Stay steady.

13. A power supply device, comprising: DC / DC converter; A power factor corrector PFC configured to receive input power and supply power to a load via the DC / DC converter; A DC / DC controller configured to control the DC / DC converter and send a first signal to the PFC controller; as well as The PFC controller is configured to control the PFC and perform the following operations: receiving the first signal from the DC / DC controller, the first signal indicating the load; deriving a second signal based on the first signal, wherein the second signal is an expected output control signal of a voltage controller included in the PFC controller under a load indicated by the first signal; as well as The voltage controller is configured according to the second signal so that the output voltage V of the PFC to the DC / DC converter is Bulk Stay steady.

14. The power supply device according to claim 13, wherein: The voltage controller is configured to generate an output control signal VCL op ,as well as Configuring the voltage controller according to the second signal includes: selectively configuring the voltage controller based on the second signal based on a reference voltage signal and an output voltage V of the PFC Bulk The output control signal VCL is generated by the difference op , or the output control signal VCL op is set equal to the second signal.

15. The power supply device according to claim 14, wherein: Configuring the voltage controller according to the second signal further comprises: When the second signal is equal to the output control signal VCL op When the absolute value of the difference is greater than the threshold, the output control signal VCL op The voltage controller is set equal to the second signal and the relevant state variables of the voltage controller are changed at the same time so that the voltage controller jumps to a state matching the new input power. 16 . The power supply device according to claim 13 , in a case where there is a safety isolation barrier between the PFC controller and the DC / DC controller, the power supply device further comprises a signal transmitter, and the DC / DC controller transmits the first signal to the PFC controller via the signal transmitter.

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