CN118232676A

CN118232676A - Power supply system and control method thereof

Info

Publication number: CN118232676A
Application number: CN202211632276.2A
Authority: CN
Inventors: 青木二郎
Original assignee: Sanken Electric Co Ltd
Current assignee: Sanken Electric Co Ltd
Priority date: 2022-12-19
Filing date: 2022-12-19
Publication date: 2024-06-21

Abstract

The embodiment of the application provides a power supply system and a control method thereof, wherein the power supply system comprises: a power supply circuit including a Power Factor Correction (PFC) circuit that converts an input voltage of an input power supply circuit into a first direct current voltage, and a main power supply circuit that converts the first direct current voltage into a second direct current voltage and outputs the second direct current voltage; and a power supply control circuit which controls on-off of a first switching element in the power factor correction circuit to enable the power factor correction circuit to output the first direct-current voltage, wherein the power supply control circuit also controls the working mode of the power factor correction circuit and/or the main power supply circuit according to a first signal related to the input power of the power supply circuit. Thus, control based on the input power can be realized, thereby improving the efficiency of the power supply system.

Description

Power supply system and control method thereof

Technical Field

The application relates to the technical field of electronic circuits, in particular to a power supply system and a control method thereof.

Background

With the increasing energy-saving requirements of electronic products, a power supply system for supplying power to the electronic products is required to be able to operate at a relatively high output power, but also at a relatively low output power (i.e., a light load mode). For example, in the case where the rated output power of the power supply system is 500 watts, it is also required that the power supply system still has high operation efficiency in the case where 10% to 20% of the rated power is actually used.

In the prior art, the output power of the power supply system may be detected, and the operation mode of the power supply system may be changed, so that the operation mode is adapted to the output power.

Fig. 1 is a schematic diagram of a prior art power supply system. As shown in fig. 1, the power supply system 1 includes a Power Factor Correction (PFC) circuit block 11, a main power supply circuit block 12, and an auxiliary power supply circuit block 13. The main circuit module 12 may be a direct current-to-direct current (DC-DC) conversion circuit, such as an LLC resonant circuit.

As shown in fig. 1, on the secondary winding side of the transformer T1 of the main circuit module 12, a current detector 121 may be provided to detect a load current, the detection result of the load current is transmitted to an LLC controller 122 in the main circuit module 12 through an optocoupler PC2, the detected load current is compared with a current threshold value, and an operation mode of the Power Factor Correction (PFC) circuit module 11 and/or the main power supply circuit module 12 is controlled based on the result of the comparison. For example, when the detected load current is smaller than the current threshold value, the main power supply circuit module 12 is stopped, or both the Power Factor Correction (PFC) circuit module 11 and the main power supply circuit module 12 are stopped.

In fig. 1, DR1 is a driver, OP1 and OP2 are an operational amplifier 1 and an operational amplifier 2, respectively, cp1 is a comparator, vref1 is a reference voltage, and RF1 is a feedback resistor.

It should be noted that the foregoing description of the background art is only for the purpose of providing a clear and complete description of the technical solution of the present application and is presented for the convenience of understanding by those skilled in the art. The above-described solutions are not considered to be known to the person skilled in the art simply because they are set forth in the background of the application section.

Disclosure of Invention

The inventor finds that in order to meet the high efficiency of the power supply system when working in medium and light load and meet the high harmonic limit condition, the working mode needs to be adjusted when the input power of the power supply system reaches a preset value; further, if the efficiency of the power supply system or the demand for power saving is further pursued, the secondary side load may be stopped to suppress the consumption of power, for example, a stop signal (for example, a standby signal) needs to be output to the secondary side load, or a main power supply circuit of the power supply system may be stopped. Therefore, control based on the input power of the power supply system is required. However, in the prior art, the current on the secondary side of the power supply system is detected and controlled, and the control cannot be performed based on the input power of the power supply system.

In order to solve at least one of the above problems or other similar problems, embodiments of the present application provide a power supply system and a control method thereof. In the power supply system, the operation mode of the power factor correction circuit and/or the main power supply circuit is controlled according to the first signal related to the input power of the power supply circuit, thereby enabling control based on the input power, and improving the efficiency of the power supply system.

According to a first aspect of an embodiment of the present application, there is provided a power supply system including:

a power supply circuit including a Power Factor Correction (PFC) circuit that converts an input voltage of an input power supply circuit into a first direct current voltage, and a main power supply circuit that converts the first direct current voltage into a second direct current voltage and outputs the second direct current voltage; and

And the power supply control circuit is used for controlling the on-off of a first switching element in the power factor correction circuit to enable the power factor correction circuit to output the first direct-current voltage, wherein the power supply control circuit is also used for controlling the working modes of the power factor correction circuit and/or the main power supply circuit according to a first signal (FB) related to the input power of the power supply circuit.

In at least one embodiment, the power control circuit includes a comparator and a mode selection circuit,

The comparator compares the first signal with a first threshold value and/or a second threshold value,

The mode selection circuit controls the working mode of the power factor correction circuit and/or the main power supply circuit according to the comparison result of the comparator.

In at least one embodiment, the mode selection circuit controls the power factor correction circuit and the main power supply circuit to operate in a standby mode if the first signal is less than the first threshold; and/or

And under the condition that the first signal is smaller than the second threshold value, the mode selection circuit controls the main power supply circuit to stop working, and the first threshold value is larger than the second threshold value.

In at least one embodiment, the first signal is calculated from the first direct current voltage.

In at least one embodiment, the power control circuit reads a voltage signal associated with the first direct voltage as a read-in voltage,

The first signal is indicative of a deviation between the read-in voltage and a predetermined voltage,

The greater the input power of the power supply circuit, the:

The greater the output power of the Power Factor Correction (PFC) circuit,

The smaller the first direct voltage, the larger the deviation value and the larger the first signal.

In at least one embodiment, the power control circuit further comprises:

a calculation circuit that calculates a deviation value between the read voltage and the predetermined voltage; and

And a first signal generation circuit that calculates the first signal from the deviation value.

In at least one embodiment, the power control circuit further comprises:

And a threshold adjustment circuit that adjusts the first threshold and/or the second threshold according to an input voltage to the power supply circuit.

An embodiment of a second aspect of the present application provides a control method of a power supply system including a Power Factor Correction (PFC) circuit that converts an input voltage of an input power supply circuit into a first direct-current voltage and a main power supply circuit that converts the first direct-current voltage into a second direct-current voltage and outputs the second direct-current voltage, the control method including:

and controlling the working mode of the power factor correction circuit and/or the main power supply circuit according to a first signal related to the input power of the power supply circuit.

In at least one embodiment, the control method further comprises:

the first threshold and/or the second threshold is/are adjusted according to an input voltage to the power supply circuit.

One of the beneficial effects of the embodiment of the application is that: the operation mode of the power factor correction circuit and/or the main power supply circuit is controlled in accordance with a first signal related to the input power of the power supply circuit, whereby control based on the input power can be achieved, thereby improving the efficiency of the power supply system.

Specific embodiments of the application are disclosed in detail below with reference to the following description and drawings, indicating the manner in which the principles of the application may be employed. It should be understood that the embodiments of the application are not limited in scope thereby. The embodiments of the application include many variations, modifications and equivalents within the scope of the terms of the appended claims.

Features that are described and/or illustrated with respect to one embodiment may be used in the same way or in a similar way in one or more other embodiments in combination with or instead of the features of the other embodiments.

It should be emphasized that the term "comprises/comprising" when used herein is taken to specify the presence of stated features, integers, steps or components but does not preclude the presence or addition of one or more other features, integers, steps or components.

Drawings

Elements and features described in one drawing or one implementation of an embodiment of the application may be combined with elements and features shown in one or more other drawings or implementations. Furthermore, in the drawings, like reference numerals designate corresponding parts throughout the several views, and may be used to designate corresponding parts as used in more than one embodiment.

The accompanying drawings, which are included to provide a further understanding of embodiments of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the principles of the application. It is evident that the drawings in the following description are only some embodiments of the present application and that other drawings may be obtained from these drawings without inventive effort for a person of ordinary skill in the art. In the drawings:

FIG. 1 is a schematic diagram of a prior art power supply system;

FIG. 2 is a schematic diagram of a power supply system according to an embodiment of the application;

FIG. 3 is a schematic diagram of the workflow of the comparator and mode selection circuit of the power control circuit 22;

FIG. 4 is a diagram showing the relationship between the input power Pin and the first signal corresponding to the AC input voltage Vac with different magnitudes;

fig. 5 is a schematic diagram of a control method of a power supply system according to an embodiment of the present application.

Detailed Description

The foregoing and other features of the application will become apparent from the following description, taken in conjunction with the accompanying drawings. In the specification and drawings, there have been specifically disclosed specific embodiments of the application that are indicative of some of the ways in which the principles of the application may be employed, it being understood that the application is not limited to the specific embodiments described, but, on the contrary, the application includes all modifications, variations and equivalents falling within the scope of the appended claims. Various embodiments of the present application are described below with reference to the accompanying drawings. These embodiments are merely illustrative and not limiting of the application.

In the embodiments of the present application, the terms "first," "second," "upper," "lower," etc. are used to distinguish between different elements from each other by reference, but do not denote a spatial arrangement or a temporal order of the elements, which should not be limited by the terms. The term "and/or" includes any and all combinations of one or more of the associated listed terms. The terms "comprises," "comprising," "including," "having," and the like, are intended to reference the presence of stated features, elements, components, or groups of components, but do not preclude the presence or addition of one or more other features, elements, components, or groups of components.

In embodiments of the present application, the singular forms "a," an, "and" the "include plural referents and should be construed broadly to mean" one "or" one type "and not limited to" one "or" another; furthermore, the term "comprising" is to be interpreted as including both the singular and the plural, unless the context clearly dictates otherwise. Furthermore, the term "according to" should be understood as "based at least in part on … …", and the term "based on" should be understood as "based at least in part on … …", unless the context clearly indicates otherwise.

Example of the first aspect

An embodiment of a first aspect of the present application provides a power supply system. Fig. 2 is a schematic diagram of a power supply system according to an embodiment of the application.

As shown in fig. 2, the power supply system 2 includes: a power supply circuit 21 and a power supply control circuit 22.

The power supply circuit 21 may include a power factor correction (PFC, power Factor Correction) circuit 211 and a main power supply circuit 212.

The power factor correction circuit 211 converts an input voltage input to the power supply circuit 21 into a first direct-current voltage. For example, the ac input voltage Vac is processed by a filter (LF) 201 and a rectifier (e.g., a diode bridge DB) 202 to generate an input voltage Vin to the power supply circuit 21. The power factor correction circuit 211 may include a first switching element Q1, capacitors C1 and C2, resistors R1 to R5, a diode D1, an inductor L1, and the like. The input voltage Vin is converted into a first direct-current voltage V1 by turning on and off the first switching element Q1, and the first direct-current voltage V1 is applied across the resistors R4 and R5. As for the specific operation principle of the power factor correction circuit 211, reference may be made to the related art.

The main power supply circuit 212 converts the first dc voltage output from the pfc circuit 211 into a second dc voltage Vout and outputs the second dc voltage Vout. In at least one embodiment, the main power circuit 212 may be a direct current-to-direct current converter (DC-DC convertor), which may be, for example, an LLC resonant circuit.

As shown in fig. 2, the main power supply circuit 212 may include a second switching element Q2, a third switching element Q3, a transformer T1, capacitors C3 and C4, diodes D2 and D3, a main power supply controller 2121, and the like. Wherein the second switching element Q2, the third switching element Q3 and the capacitor C3 are located at the primary winding P1 side of the transformer T1, i.e., at the primary side. The capacitor C4, the diodes D2 and D3 are located on the secondary side of the transformer T1. The main power controller 2121 may generate a main power control signal, e.g., a Pulse Width Modulation (PWM) control signal. The main power supply control signal is output to the gate of the second switching element Q2 and the gate of the third switching element Q3 to control on/off of the second switching element Q2 and the third switching element Q3, thereby performing conversion of the dc voltage.

Furthermore, the application is not limited thereto, and the dc-dc converter may also be other forms of resonant circuits.

As shown in fig. 2, the power supply control circuit 22 controls the on/off of the first switching element Q1 in the power factor correction circuit 211 so that the power factor correction circuit 211 outputs the first dc voltage V1. For example, the power supply control circuit 22 may have a signal generator (signal generator) 221, and the signal generator 221 may generate a first control signal, which may be a Pulse Width Modulation (PWM) control signal, that may be output to a gate of the first switching element Q1 via a driver DR1, thereby controlling on-off of the first switching element Q1.

In the present application, the power control circuit 22 also controls the operation mode of the power factor correction circuit 211 and/or the main power supply circuit 212 according to the first signal FB related to the input power Pin of the power supply circuit 21. Thus, control based on the input power can be realized, thereby improving the efficiency of the power supply system.

As shown in fig. 2, the power supply control circuit 22 includes a comparator 222 and a mode selection circuit 223.

The comparator 222 compares the first signal FB with the first threshold Vth1 and/or the second threshold Vth2, wherein the first threshold Vth1 is greater than the second threshold Vth2. For example, the first signal FB may be input to the non-inverting terminal "+" of the comparator 222, the reference voltage Vref may be input to the inverting terminal "-" of the comparator 222, and the reference voltage Vref may be adjusted so as to correspond to the first threshold Vth1 or the second threshold Vth2. When the voltage of the non-inverting terminal "+" is greater than the voltage of the inverting terminal "-", the comparator 222 outputs a high signal; when the voltage at the non-inverting terminal "+" is smaller than the voltage at the inverting terminal "-", the comparator 222 outputs a low signal. Thereby, the comparison result of the comparator 222 can be input to the mode selection circuit 223.

The mode selection circuit 223 controls the operation mode of the power factor correction circuit 211 and/or the main power supply circuit 212 according to the comparison result of the comparator 222.

For example, in the case where the first signal FB is smaller than the first threshold Vth1, the mode selection circuit 223 controls the power factor correction circuit 211 and the main power supply circuit 212 to operate in a standby mode (standby mode) in which the output power of the power factor correction circuit 211 and the main power supply circuit 212 operates is lower than that in the normal mode.

For another example, in the case where the first signal FB is smaller than the second threshold Vth2, the mode selection circuit 223 controls the main power supply circuit 212 to stop operating.

Fig. 3 is a schematic diagram of the operation of the comparator and mode selection circuit of the power control circuit 22. As shown in fig. 3, the process includes:

operation 301, judging whether the first signal FB is smaller than a first threshold Vth1, if yes, entering operation 302, otherwise repeating the judgment of operation 301;

Operation 302, controlling the pfc circuit 211 and the main power supply circuit 212 to operate in a standby mode (standby mode);

Operation 303, judging whether the first signal FB is smaller than the second threshold Vth2, if yes, entering operation 304, otherwise repeating the judgment of operation 303;

Operation 304, controlling the main power circuit 212 to stop working;

Operation 305, judging whether the first signal FB is smaller than the second threshold Vth2, if yes, repeating the judgment of operation 305, otherwise, entering operation 306;

Operation 306, controlling the main power circuit 212 to start up, and controlling the pfc circuit 211 and the main power circuit 212 to operate in a standby mode (standby mode);

Operation 307, judging whether the first signal FB is smaller than the first threshold Vth1, if yes, repeating the judgment of operation 307, otherwise, entering operation 308;

Operation 308, control power factor correction circuit 211 and main power supply circuit 212 operate in a normal mode (i.e., perform a stabilizing action).

In this embodiment, the first signal FB may be calculated according to the first dc voltage V1. On the other hand, the larger the first dc voltage V1, the smaller the output power of the pfc circuit 211, that is, the smaller the input power Pin of the power supply circuit 21; on the other hand, the larger the first direct voltage V1, the smaller the first signal FB. Therefore, the first signal FB has a correlation with the input power Pin, for example, a relationship shown by line segments 401 and 402 in fig. 4 described later.

As shown in fig. 2, the power supply control circuit 22 may read the voltage signal related to the first direct current voltage V1 as the read-in voltage. For example, the voltage signal applied to the resistor R5 is read as the read voltage Vr.

The first signal FB may represent a deviation value between the read-in voltage Vr and a predetermined voltage Vd (not shown in fig. 2). The larger the input power Pin of the power supply circuit 21 is, the: the larger the output power of the Power Factor Correction (PFC) circuit 211, the smaller the first direct current voltage V1, and the larger the deviation value between Vr and Vd, so the larger the first signal FB.

As shown in fig. 2, the power supply control circuit 22 further includes: a calculation circuit 224 and a first signal generation circuit 225. The calculating circuit 224 calculates a deviation value between the read voltage Vr and the predetermined voltage Vd, for example, the calculating circuit 224 may be a proportional-integral (PI) controller capable of performing control to make the read voltage Vr closer to the predetermined voltage Vd, so the calculating circuit 224 may calculate the deviation value between the read voltage Vr and the predetermined voltage Vd with the predetermined voltage Vd as a control target. Thus, when the predetermined voltage Vd is fixed, the read voltage Vr becomes lower and the deviation value becomes larger. The first signal generation circuit 225 may calculate the first signal FB based on the deviation value, and for example, the larger the deviation value is, the larger the first signal FB is, whereby control to bring the read voltage Vr closer to the predetermined voltage Vd can be performed.

The first signal FB generated by the first signal generating circuit 225 may be input to a signal generator (signal generator) 221, and the signal generator (signal generator) 221 may generate a first control signal to control the on-off of the first switching element Q1 based on the first signal FB, the voltage signal applied to the resistor R2, and the voltage signal applied to the resistor R3, thereby adjusting the first dc voltage V1 to make the read voltage Vr approach the predetermined voltage Vd.

Fig. 4 is a schematic diagram showing the relationship between the input power Pin and the first signal corresponding to the ac input voltage Vac with different magnitudes. In fig. 4, the horizontal axis represents the input power Pin in watts (W), and the vertical axis represents the first signal FB, expressed as a percentage (%).

As shown in fig. 4, a line segment 401 represents a relationship between the first signal FB and the input power Pin when the amplitude of the ac input voltage Vac is 100V, and a line segment 402 represents a relationship between the first signal FB and the input power Pin when the amplitude of the ac input voltage Vac is 240V.

As can be seen from fig. 4, the first signals corresponding to the ac input voltages Vac with different magnitudes have different relationships with the input power Pin. For example, corresponding to the case where Pin is 100 watts: when the amplitude of the ac input voltage Vac is 100V, the value of the first signal FB is about 22; when the amplitude of the ac input voltage Vac is 240V, the value of the first signal FB is about 2. Therefore, if the same threshold is set for the line segments 401, 402 (e.g., the first threshold is 10 and the second threshold is 4), then in the case of Pin being 100 watts: when the amplitude of the ac input voltage Vac is 100V, the value 22 of the first signal FB is greater than the first threshold, so that the standby mode cannot be entered, and the energy consumption cannot be reduced; when the amplitude of the ac input voltage Vac is 240V, the value 2 of the first signal FB is smaller than the second threshold, so that the main power circuit 212 stops operating and the power consumption can be reduced. That is, when the amplitude of the ac input voltage Vac is within a certain range, the operation mode for reducing the power consumption cannot be correctly entered.

As shown in fig. 2, the power supply control circuit 22 may further include: a threshold adjustment circuit 226. The threshold adjustment circuit 226 adjusts the first threshold Vth1 and/or the second threshold Vth2 according to the input voltage Vin input to the power supply circuit 21. Thus, it is possible to compensate for different proportional relationships between the first signal and the input power Pin due to the difference in the amplitude of the ac input voltage Vac.

In the present application, the threshold value adjustment circuit 226 can adjust the first threshold value Vth1 and/or the second threshold value Vth2 according to the amplitude change of the ac input voltage Vac. Accordingly, even if the amplitude of the ac input voltage Vac changes, the first threshold Vth1 and/or the second threshold Vth2 can be accurately set, and the power supply control circuit 22 can switch the operation modes of the power factor correction circuit 211 and/or the main power supply circuit 212 at the correct timing.

For example, the threshold adjustment circuit 226 may read the voltage applied to the resistor R2 and adjust the first threshold Vth1 and/or the second threshold Vth2 according to the voltage. In one embodiment, the threshold adjustment circuit 226 may adjust the first threshold Vth1 and/or the second threshold Vth2 according to a lookup table (lookup table) of the correspondence between the voltage across the resistor R2 and the first threshold Vth1 and/or the second threshold Vth 2.

As shown in fig. 2, in the present application, the comparison result of the first signal and the first threshold value and/or the second threshold value may be transmitted to the secondary side of the transformer T1, and further, a control command returned from the secondary side (e.g., a control command for the LLC) may be received. For example, a General Purpose Input Output (GPIO) terminal of the power control circuit 22 may send a comparison result of the first signal and the first threshold value and/or the second threshold value to a load (load) on the secondary side through an interface circuit (I/F); the general purpose input/output (GPIO) terminal of the power control circuit 22 may also receive a control command to resume operation of the main power supply 212 or another control command from a secondary side LOAD (LOAD) via an interface circuit (I/F).

In addition, in fig. 2, ADC means an analog-to-digital converter for converting an analog signal into a digital signal, whereby each module in the power supply control circuit 22 can perform control or data processing according to the digital signal.

In addition, in fig. 2, an error amplifier (Err AMP) 2122 may detect the second dc voltage Vout and transmit the detected result to a main power controller 2121 through an optocoupler PC1, and the main power controller 2121 generates a main power control signal according to the detected result to control on/off of the second switching element Q2 and the third switching element Q3.

In the present application, the power supply control circuit 22 and the main power supply controller 2121 may be integrated into a chip of one controller or may be separate devices from each other.

In the present application, the auxiliary (SUB) power supply is omitted. However, as required, reference may also be made to the auxiliary power supply of fig. 1, which is provided in fig. 2 to supply the load.

In addition, the descriptions for the elements with the same reference numerals in fig. 1 and 2 are the same.

According to the embodiment of the first aspect, the power supply control circuit 22 controls the operation mode of the power factor correction circuit 211 and/or the main power supply circuit 212 according to the first signal FB related to the input power Pin of the power supply circuit 21. Thus, control based on the input power can be realized, thereby improving the efficiency of the power supply system. Compared with the prior art that the control is performed based on the current detection result of the secondary side, the method for detecting and controlling the input power through the primary side is more reasonable.

Embodiments of the second aspect

An embodiment of the second aspect of the present application provides a control method of a power supply system for controlling the power supply system of the embodiment of the first aspect. Since the structure and function of the power supply system have been described in detail in the embodiment of the first aspect, the same is incorporated herein, and the description thereof is omitted.

Fig. 5 is a schematic diagram of a control method of a power supply system according to an embodiment of the present application. As shown in fig. 5, the control method of the power supply system includes:

operation 501 controls an operation mode of the power factor correction circuit and/or the main power supply circuit based on a first signal related to an input power of the power supply circuit.

In operation 501, controlling the power factor correction circuit and the main power supply circuit to operate in a standby mode (standby mode) if the first signal is less than a first threshold; and/or controlling the main power supply circuit to stop working under the condition that the first signal is smaller than the second threshold value. Wherein the first threshold is greater than the second threshold.

As shown in fig. 5, the control method further includes:

Operation 502 adjusts the first threshold and/or the second threshold based on an input voltage to the power circuit.

According to an embodiment of the second aspect, the operation mode of the power factor correction circuit and/or the main power supply circuit is controlled in dependence of the first signal FB related to the input power Pin of the power supply circuit. Thus, control based on the input power can be realized, thereby improving the efficiency of the power supply system. Compared with the prior art that the control is performed based on the current detection result of the secondary side, the method for detecting and controlling the input power through the primary side is more reasonable.

Moreover, while those skilled in the art may have great effort and many design choices are made by, for example, available time, current technology, and economic considerations, they can readily generate such software instructions and programs and Integrated Circuits (ICs) with minimal experimentation, given the guidance of the concepts and principles disclosed herein.

In general, the various embodiments of the invention may be implemented in software or special purpose circuits, hardware, logic or any combination thereof. Some aspects may be implemented in hardware, while other aspects may be implemented in firmware or software which may be executed by a controller, microprocessor or other computing device.

While embodiments of the invention have been illustrated and described in block diagrams, flow charts, or using some other pictorial representation, it is well understood that blocks, apparatus, systems, or methods described herein may be implemented in, without limitation, hardware, software, firmware, special purpose circuits or logic, general purpose hardware or controller or other computing devices, or combinations thereof.

Also, while the above description contains details of several embodiments, these should not be construed as limitations on the scope of the invention, but rather as descriptions of features specific to particular embodiments. Certain features that are described in the context of separate embodiments can also be implemented in combination in a single embodiment. Conversely, various features that are described in the context of separate embodiments can also be implemented in multiple embodiments separately or in suitable combination.

Although the invention has been described in language specific to structural features and/or methodological acts, it is to be understood that the invention defined in the appended claims is not necessarily limited to the specific features or acts described above. Rather, the specific features and acts described above are disclosed as example forms of implementing the claims.

While the application has been described in connection with specific embodiments, it will be apparent to those skilled in the art that the description is intended to be illustrative and not limiting in scope. Various modifications and alterations of this application will occur to those skilled in the art in light of the spirit and principles of this application, and such modifications and alterations are also within the scope of this application.

Claims

1. A power supply system, the power supply system comprising:

A power supply control circuit for controlling the on-off of a first switching element in the power factor correction circuit to make the power factor correction circuit output the first direct current voltage,

Wherein,

The power supply control circuit also controls the operating mode of the power factor correction circuit and/or the main power supply circuit in dependence on a first signal (FB) related to the input power of the power supply circuit.

2. The power system of claim 1, wherein,

The power control circuit includes a comparator and a mode selection circuit,

3. The power system of claim 2, wherein,

The mode selection circuit controls the power factor correction circuit and the main power supply circuit to operate in a standby mode (standby mode) in a case where the first signal is smaller than the first threshold; and/or

In the case that the first signal is smaller than the second threshold value, the mode selection circuit controls the main power supply circuit to stop working,

The first threshold is greater than the second threshold.

4. The power system of claim 2, wherein,

The first signal is calculated from the first direct current voltage.

5. The power system of claim 4, wherein,

The power supply control circuit reads a voltage signal related to the first direct-current voltage as a read-in voltage,

The greater the input power of the power supply circuit, the:

The greater the output power of the Power Factor Correction (PFC) circuit,

6. The power system of claim 5, wherein,

The power supply control circuit further includes:

7. The power system of claim 2, wherein,

The power supply control circuit further includes:

8. A control method of a power supply system including a Power Factor Correction (PFC) circuit converting an input voltage of an input power supply circuit into a first DC voltage and a main power supply circuit converting the first DC voltage into a second DC voltage and outputting,

It is characterized in that the method comprises the steps of,

The control method comprises the following steps:

9. The control method according to claim 8, wherein,

Controlling the power factor correction circuit and the main power supply circuit to operate in a standby mode (standby mode) if the first signal is less than a first threshold; and/or

And controlling the main power circuit to stop working under the condition that the first signal is smaller than a second threshold value,

The first threshold is greater than the second threshold.

10. The control method according to claim 9, wherein,

The control method further includes: