Switching power supply ripple adjustment system and ripple suppression method

Abstract

The invention discloses a switching power supply ripple adjusting system and a ripple suppression method, and relates to the technical field of ripple suppression. The switching power supply ripple adjusting system comprises a ripple processing module, a synchronous rectification module, a rectification output capacitor and at least one synchronous rectification branch. Any synchronous rectification branch comprises a synchronous rectification transistor and a secondary coil which are connected in series; the ripple processing module is connected with the rectification output capacitor, the ripple processing module is connected with the synchronous rectification module, the rectification output capacitor is connected with the synchronous rectification transistor, and the synchronous rectification module is connected with the synchronous rectification transistor in any synchronous rectification branch; and the ripple processing module is used for collecting a branch sampling signal on the rectification output capacitor, obtaining the synchronous rectification frequency of the synchronous rectification module, and inhibiting the ripple on the synchronous rectification branch according to the branch sampling signal and the change of the synchronous rectification frequency.

Description

Technical Field

[0001] The present invention relates to the technical field of ripple suppression, and particularly relates to a switching power supply ripple adjustment system and a ripple suppression method. Background Art

[0002] With the development of server technology, a large number of precision electronic components are assembled inside. Tiny voltage fluctuations will affect the performance of the server. Therefore, the server has an urgent need for low output ripple from its applied Common Redundant Power Supply (CRPS). Lower output ripple means that the voltage output by the power supply is more stable and smooth, reducing high-frequency noise interference. Low output ripple can ensure the stable operation of core components such as CPUs and memories in the server, reducing the risk of data errors and losses caused by unstable voltages. A stable power supply can extend the service life of server hardware, reduce the downtime due to power problems, improve the reliability and availability of the server system, and ensure that the server efficiently and uninterruptedly provides services such as data processing and storage for users.

[0003] Currently, the main means of suppressing ripple are increasing capacitors and adjusting the loop. Although increasing capacitors can buffer some ripple, for low-frequency ripple, large-capacity capacitors have a slow response and are difficult to adjust quickly; while high-frequency ripple changes extremely fast, and ordinary capacitors cannot effectively filter it. In terms of adjusting the loop, due to its limited adjustment range and complex parameter settings, when facing ripple with variable frequencies, its sensitivity is insufficient and it cannot respond timely and accurately. This leads to unsatisfactory processing of both low-frequency and high-frequency ripple, resulting in poor stability of the power supply output, affecting the normal operation of precision components in the server, and further reducing the overall reliability and performance of the server system. Summary of the Invention

[0004] This application provides a switching power supply ripple adjustment system and a ripple suppression method, which at least solve the problem that it is difficult to effectively improve the ripple of the server power supply by increasing capacitors and adjusting the loop.

[0005] In a first aspect, this application provides a switching power supply ripple adjustment system, including: a ripple processing module, a synchronous rectification module, a rectification output capacitor, and at least one synchronous rectification branch; Any one of the at least one synchronous rectification branch includes: a synchronous rectification transistor and a secondary side coil connected in series; The ripple processing module is connected to the rectification output capacitor, the ripple processing module is connected to the synchronous rectification module, the rectification output capacitor is connected to the synchronous rectification transistor, and the synchronous rectification module is connected to the synchronous rectification transistor in any one of the synchronous rectification branches; A ripple processing module is used to collect branch sampling signals on the rectified output capacitor, obtain the synchronous rectification frequency of the synchronous rectification module, and suppress the ripple on the synchronous rectification branch according to the branch sampling signals and the change of the synchronous rectification frequency.

[0006] In a second aspect, the present application further provides a ripple suppression method, which is characterized in that it is applied to the controller of the switching power supply ripple adjustment system described in the first aspect, and includes: In response to obtaining a ripple adjustment signal, start the switching power supply ripple adjustment system and obtain the output branch sampling signal of the switching power supply; Determine an adjustable device adjustment signal according to the output branch sampling signal, where the adjustable device adjustment signal includes: an adjustable resistor adjustment signal, an adjustable capacitor adjustment signal, and an adjustable inductor adjustment signal; Adjust the adjustable resistor in the switching power supply ripple adjustment system according to the adjustable resistor adjustment signal, adjust the adjustable capacitor in the switching power supply ripple adjustment system according to the adjustable capacitor adjustment signal, and adjust the adjustable inductor in the switching power supply ripple adjustment system according to the adjustable inductor adjustment signal to reduce the output ripple of the switching power supply.

[0007] The beneficial effects brought by the technical solutions provided in the embodiments of the present application are as follows: By implementing a switching power supply ripple adjustment system and a ripple suppression method provided in the embodiments of the present application, it is possible to quickly suppress the output ripple according to the synchronous rectification frequency of the switching power supply and the sampling signal of the synchronous rectification branch through an actively intervening adjustment method, and improve the power quality. Description of the Drawings

[0008] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0009] Figure 1 It is a schematic diagram of a switching power supply ripple adjustment system provided by an embodiment of the present application; Figure 2 It is a schematic diagram of a ripple processing module provided by an embodiment of the present application; Figure 3 It is a schematic diagram of a comparison module provided by an embodiment of the present application; Figure 4 It is a schematic diagram of an adjustable device module provided by an embodiment of the present application; Figure 5 It is a schematic diagram of a ripple suppression method provided by an embodiment of the present application. Detailed Embodiments

[0010] To make the objectives, technical solutions, and advantages of this application clearer, the following will clearly and completely describe the technical solutions in the embodiments of this application with reference to the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are only a part rather than all of the embodiments of this application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in this application without creative efforts belong to the scope of protection of this application.

[0011] Unless otherwise defined, the technical terms or scientific terms used in this disclosure shall have the ordinary meanings understood by those of ordinary skill in the art to which this disclosure pertains. The "first", "second", and similar terms used in this disclosure do not denote any order, quantity, or importance, but are only used to distinguish different components. Similarly, terms such as "a", "an", or "the" do not denote a quantity limitation, but mean that there is at least one. The numbers in the accompanying drawings of the specification only represent the distinction of each functional component or module, and do not represent the logical relationship between the components or modules. The term "including" or "comprising" and the like mean that the elements or items appearing before this word cover the elements or items listed after this word and their equivalents, without excluding other elements or items. The term "connected" or "coupled" and the like are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. The terms "upper", "lower", "left", "right", etc. are only used to represent relative positional relationships, and when the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0012] Next, various embodiments according to the present disclosure will be described in detail with reference to the accompanying drawings. It should be noted that in the drawings, the same reference numerals are assigned to components having substantially the same or similar structures and functions, and repeated descriptions thereof will be omitted.

[0013] Regarding the problem in the prior art that it is difficult to effectively improve the power supply ripple of a server by increasing capacitance and adjusting the loop. The following embodiments are provided in this application.

[0014] In some embodiments, as Figure 1 shown, a switching power supply ripple adjustment system includes: a ripple processing module 1, a synchronous rectification module 2, a rectification output capacitor 3, and at least one synchronous rectification branch 4; Any one of the at least one synchronous rectification branch 4 includes: a synchronous rectification transistor 41 and a secondary side coil 42 connected in series; The ripple processing module 1 is connected to the rectifier output capacitor 3, the ripple processing module 1 is connected to the synchronous rectification module 2, the rectifier output capacitor 3 is connected to the synchronous rectification transistor 41, and the synchronous rectification module 2 is connected to the synchronous rectification transistor 41 in any one of the synchronous rectification branches 4; The ripple processing module 1 is configured to collect the branch sampling signal on the rectifier output capacitor, obtain the synchronous rectification frequency of the synchronous rectification module 2, and suppress the ripple on the synchronous rectification branch 4 according to the branch sampling signal and the change of the synchronous rectification frequency.

[0015] Such as Figure 2 As shown, the ripple processing module 1 includes: a controller 110, a comparison module 120, an adjustable device module 130, a switch T, and a sampling resistor R s ; The controller 110 has: a first controller port 110a, a second controller port 110b, a third controller port 110c, a fourth controller port 110d, and a fifth controller port 110e; The comparison module 120 has: a first comparison module port 120a, a second comparison module port 120b, and a third comparison module port 120c; The adjustable device module 130 has: a first adjustable port 130a, a second adjustable port 130b, a third adjustable port 130c, a fourth adjustable port 130d, and a fifth adjustable port 130e; The switch T has: a first switch port T1, a second switch port T2, and a third switch port T3; The sampling resistor R s The two ends of are respectively connected to the first comparison module port 120a and the third comparison module port 120c; the first comparison module port 120a is also connected to the second switch port T2, the third switch port T3 is connected to the second comparison module port 120b, the second comparison module port 120b is also connected to the first adjustable port 130a, the second adjustable port 130b is connected to the third comparison module port 120c, the first switch port T1 is connected to the first controller port 110a, the third controller port 110c is connected to the third adjustable port 130c, the fourth controller port 110d is connected to the fourth adjustable port 130d, and the fifth controller port 110e is connected to the fifth adjustable port 130e; The second controller port 110b is used to obtain and receive the ripple adjustment signal.

[0016] The controller 110 sends an adjustable resistor adjustment signal for adjusting the value of the adjustable resistor to the adjustable device module 130 through the third controller port 110c, sends an adjustable capacitor adjustment signal for adjusting the value of the adjustable capacitor to the adjustable device module 130 through the fourth controller port 110d, and sends an adjustable inductor adjustment signal for adjusting the value of the adjustable inductor to the adjustable device module 130 through the fifth controller port 110e.

[0017] As Figure 3 shown, the comparison module 120 includes: a comparator 121 and a feedback resistor R f ; The comparator 121 has: a non-inverting input terminal 121a, an inverting input terminal 121b, a comparator output terminal 121c, a comparator power supply terminal 121d, and a comparator ground terminal 121e; The non-inverting input terminal 121a serves as the first comparison module port 120a, and the inverting input terminal 121b is connected to the comparator output terminal 121c in series after being connected in series with the feedback resistor R f The comparator power supply terminal 121d serves as the third comparison module port 120c, and the comparator ground terminal 121e is grounded.

[0018] As Figure 4 shown, the adjustable device module 130 includes: an adjustable resistor R v , an adjustable capacitor C v and an adjustable inductor L v ; One end of the adjustable resistor R v is connected to one end of the adjustable capacitor C v and serves as the first adjustable port 130a. The other end of the adjustable resistor R v is connected to one end of the adjustable inductor L v . The other end of the adjustable inductor L v is connected to the other end of the adjustable capacitor C v and serves as the second adjustable port 130b; The resistance adjustment port of the adjustable resistor serves as the third adjustable port 130c, the capacitance adjustment port of the adjustable capacitor serves as the fourth adjustable port 130d, and the inductance adjustment port of the adjustable inductor serves as the fifth adjustable port 130e.

[0019] The adjustable device module can adjust the values of the internal adjustable resistor, adjustable capacitor, and adjustable inductor respectively according to the adjustable resistor adjustment signal, adjustable capacitor adjustment signal, and adjustable inductor adjustment signal sent by the controller, so as to suppress the ripple of the synchronous rectification branch.

[0020] In some other embodiments, as Figure 5 shown, a ripple suppression method is applied to the controller of the switching power supply ripple adjustment system described above, and includes: S100: A switching power supply ripple adjustment system that is started in response to obtaining a ripple adjustment signal, and obtains a sampling signal of the output branch of the switching power supply; S200: Determine an adjustable device adjustment signal according to the sampling signal of the output branch, where the adjustable device adjustment signal includes: an adjustable resistor adjustment signal, an adjustable capacitor adjustment signal, and an adjustable inductor adjustment signal; S300: Adjust the adjustable resistor in the switching power supply ripple adjustment system according to the adjustable resistor adjustment signal, adjust the adjustable capacitor in the switching power supply ripple adjustment system according to the adjustable capacitor adjustment signal, and adjust the adjustable inductor in the switching power supply ripple adjustment system according to the adjustable inductor adjustment signal to reduce the output ripple of the switching power supply.

[0021] Specifically, S200: Determine an adjustable device adjustment signal according to the sampling signal of the output branch, including: S210: Determine the synchronous rectification frequency of the switching power supply according to the sampling signal of the output branch to stabilize the output branch voltage of the switching power supply, where the synchronous rectification frequency is determined by the output voltage of the output branch; S220: Determine an adjustable device adjustment signal according to the sampling signal of the output branch and the change in the synchronous rectification frequency.

[0022] In some embodiments, the increase in ripple is caused by the increase in the synchronous rectification frequency. Accordingly, S221a: In response to the increase in the synchronous rectification frequency, then according to L adj = L 0· ( 1 + k 1· Δ f / f nom ), determine the target value of the adjustable inductor, where, L adj represents the target value of the adjustable inductor after adjustment, L 0 represents the initial value of the inductor before adjustment, k 1 represents the inductor compensation coefficient, Δ f = f sw - f nom , represents the frequency change amount, f sw represents the current synchronous rectification frequency, f nom represents the rated resonant frequency; S222a: According to C adj = C 0· ( 1 - k 2· Δ V r / V o ) to determine the target value of the adjustable capacitor, where C adj represents the target value of the adjustable capacitor after adjustment, C 0 represents the initial value of the capacitor before adjustment, k 2 represents the capacitor attenuation coefficient, Δ V r represents the peak-to-peak value of the ripple voltage, V o represents the output voltage of the synchronous rectification branch; S223a: According to R adj = R 0· (1 + k 3· Δ f / f nom ) to determine the target value of the adjustable resistor, where R adj represents the target value of the adjustable resistor after adjustment, R 0 represents the initial value of the resistor before adjustment, k 3 represents the damping coefficient; S224a: Generate an adjustable inductor adjustment signal according to the target value of the adjustable inductor, generate an adjustable capacitor adjustment signal according to the target value of the adjustable capacitor, and generate an adjustable resistor adjustment signal according to the target value of the adjustable resistor.

[0023] In some other embodiments, the increase in the ripple is caused by the decrease in the synchronous rectification frequency. Accordingly, S221b: In response to the decrease in the synchronous rectification frequency, then according to L adj = L 0· (1 - k 4· Δ V r / V o ) to determine the target value of the adjustable inductor, where L adj represents the target value of the adjustable inductor after adjustment, L 0 represents the initial value of the inductor before adjustment, k 4 represents the inductor attenuation coefficient, Δ V r represents the peak-to-peak value of the ripple voltage, V o represents the output voltage of the synchronous rectification branch; S222b: According to C adj = C 0· (1 + k 5· Δ I / Inom ), determine the target value of the adjustable capacitor, where C adj represents the target value of the adjustable capacitor after adjustment, C 0 represents the initial value of the capacitor before adjustment, k 5 represents the capacitor enhancement coefficient, Δ I = I load - I nom , representing the change in load current, I load represents the current load current, I nom represents the rated load current; S223b: R adj = R 0 · (1 - k 6 · Δ f / f nom ), determine the target value of the adjustable resistor, where R adj represents the target value of the adjustable resistor after adjustment, R 0 represents the initial value of the resistor before adjustment, k 6 represents the resistor attenuation coefficient, Δ f = f sw - f nom , representing the change in frequency, f sw represents the current synchronous rectification frequency, f nom represents the rated resonant frequency; S224b: Generate an adjustable inductor adjustment signal according to the target value of the adjustable inductor, generate an adjustable capacitor adjustment signal according to the target value of the adjustable capacitor, and generate an adjustable resistor adjustment signal according to the target value of the adjustable resistor.

[0024] In some other embodiments, S221c: In response to the output branch sampling signal indicating that the switching power supply ripple becomes larger, then according to L adj = L 0 + Δ L , determine the target value of the adjustable inductor, according to C adj = C 0 + Δ C , determine the target value of the adjustable capacitor, according to, R adj = R 0 + Δ R = R0· ( f do / f nom ) -1 / 2 , determine the target value of the adjustable resistor, where, L adj represents, L 0 represents, C adj represents, C 0 represents, R adj represents, R 0 represents, Δ L represents, Δ C represents, Δ R represents, Δ L 、Δ C 、Δ R According to Δ V r = k L · Δ L + k C · Δ C + k R · Δ R and fre = 1 / 2π( L adj · C adj ) -1 / 2 Solve simultaneously to obtain, Δ V r represents the peak-to-peak value of the ripple voltage, k L represents the inductance sensitivity coefficient, k C represents the capacitance sensitivity coefficient, k R represents the resistance sensitivity coefficient, f re represents the resonant frequency, f do represents the main frequency of the ripple energy, f nom represents the rated resonant frequency; S222c: Generate an adjustable inductor adjustment signal according to the target value of the adjustable inductor, generate an adjustable capacitor adjustment signal according to the target value of the adjustable capacitor, and generate an adjustable resistor adjustment signal according to the target value of the adjustable resistor.

[0025] An adjustable resistor is a resistor whose resistance value can be changed. The implementation methods of adjustable resistors include: digital potentiometers, using MOSFETs to simulate variable resistors, and voltage-controlled resistors, etc.

[0026] Taking a digital potentiometer as an example, the controller 110 sends instructions to the third adjustable port 130c via SPI or I 2 C bus to directly adjust the resistance value inside the digital potentiometer. Taking the case of transmitting instructions via I 2 C bus as an example, the I 2 C bus is correspondingly connected to the SCL and SDA pins of the digital potentiometer. The digital potentiometer receives the control signal via the I 2 C bus and adjusts the resistance value according to the control signal.

[0027] Taking a MOSFET as an example, the MOSFET is an enhancement-mode N-channel MOSFET. By transmitting a pulse-width modulation signal to its gate, the gate voltage is controlled, thereby changing the on-resistance between the drain and source of the MOSFET.

[0028] A typical voltage-controlled resistor is a junction field-effect transistor (JFET). Taking the junction field-effect transistor as an example, its gate receives the control signal sent by the controller to change the resistance between its drain and source. The control signal for the junction field-effect transistor can be a pulse-width modulation (PWM) signal.

[0029] An adjustable inductor refers to an inductor whose inductance value can be changed. The implementation methods of adjustable inductors include: magnetically controlled inductors, switched inductor arrays, and magnetic saturation reactors, etc.

[0030] Taking a magnetically controlled inductor as an example, a solenoid or a stepper motor is used to move the magnetic core, and controlling the position of the solenoid or the stepper motor can change the inductance value.

[0031] Taking a switched inductor array as an example, multiple fixed-value inductors and relays are used, and different inductor combinations are selected by controlling the on-off states of the relays to adjust the inductance value.

[0032] Taking a magnetic saturation reactor as an example, the controller converts the control signal or pulse-width modulation signal generated by the digital-to-analog converter into a direct current signal and inputs the direct current into the winding of the reactor to adjust the saturation degree of the magnetic core, thereby changing the inductance value of the winding.

[0033] An adjustable capacitor refers to a capacitor whose capacitance value can be changed. The implementation methods of adjustable capacitors include: varactor diodes, switched capacitor arrays, etc.

[0034] Taking a varactor diode as an example, a digital-to-analog converter is used to generate an adjustable voltage, the varactor diode is reverse-biased, and the capacitance value is adjusted by changing the reverse bias voltage.

[0035] Taking a capacitor array as an example, multiple fixed-value capacitors and relays are used. By controlling the switching states of the relays, different capacitor combinations are selected to adjust the capacitance value.

[0036] Preferably, before responding to obtaining the ripple adjustment signal, it further includes: S010: When the electrical appliance powered by the switching power supply is turned on, a ripple adjustment signal is generated; S020: When the shutdown process of the electrical appliance is started, a ripple adjustment signal is generated; S030: When the load of the electrical appliance changes, a ripple adjustment signal is generated.

[0037] The beneficial effects brought by the technical solution provided by the embodiments of the present application are as follows: By implementing a switching power supply ripple adjustment system and a ripple suppression method provided by the embodiments of the present application, it is possible to quickly suppress the output ripple and improve the power quality by actively intervening and adjusting according to the synchronous rectification frequency of the switching power supply and the sampling signal of the synchronous rectification branch. By providing various examples of variable resistors, variable capacitors, and variable inductors, as well as corresponding control and adjustment methods, more selection space and design flexibility are provided for the design and implementation of the switching power supply ripple adjustment system to meet the design requirements in different scenarios.

[0038] Embodiment 1 A switching power supply ripple adjustment system, as Figure 1 shown, includes: a ripple processing module 1, a synchronous rectification module 2, a rectified output capacitor 3, and at least one synchronous rectification branch 4; Any one of the at least one synchronous rectification branch 4 includes: a synchronous rectification transistor 41 and a secondary side coil 42 connected in series; The ripple processing module 1 is connected to the rectified output capacitor 3, the ripple processing module 1 is connected to the synchronous rectification module 2, the rectified output capacitor 3 is connected to the synchronous rectification transistor 41, and the synchronous rectification module 2 is connected to the synchronous rectification transistor 41 in any one of the synchronous rectification branches 4; The ripple processing module 1 is used to collect the branch sampling signal on the rectified output capacitor, and obtain the synchronous rectification frequency of the synchronous rectification module 2, and suppress the ripple on the synchronous rectification branch 4 according to the branch sampling signal and the change of the synchronous rectification frequency.

[0039] The ripple processing module 1, as Figure 2 shown, includes: a controller 110, a comparison module 120, an adjustable device module 130, a switch T, and a sampling resistor R s ; The controller 110 has: a first controller port 110a, a second controller port 110b, a third controller port 110c, a fourth controller port 110d, and a fifth controller port 110e; The comparison module 120 has: a first comparison module port 120a, a second comparison module port 120b, and a third comparison module port 120c; The adjustable device module 130 has: a first adjustable port 130a, a second adjustable port 130b, a third adjustable port 130c, a fourth adjustable port 130d, and a fifth adjustable port 130e; The switch T has: a first switch port T1, a second switch port T2, and a third switch port T3; The sampling resistor R s has its two ends respectively connected to the first comparison module port 120a and the third comparison module port 120c; the first comparison module port 120a is also connected to the second switch port T2, the third switch port T3 is connected to the second comparison module port 120b, the second comparison module port 120b is also connected to the first adjustable port 130a, the second adjustable port 130b is connected to the third comparison module port 120c, the first switch port T1 is connected to the first controller port 110a, the third controller port 110c is connected to the third adjustable port 130c, the fourth controller port 110d is connected to the fourth adjustable port 130d, and the fifth controller port 110e is connected to the fifth adjustable port 130e; The second controller port 110b is used to obtain an accepted ripple adjustment signal.

[0040] The controller 110 sends an adjustable resistor adjustment signal for adjusting the value of the adjustable resistor to the adjustable device module 130 through the third controller port 110c, sends an adjustable capacitor adjustment signal for adjusting the value of the adjustable capacitor to the adjustable device module 130 through the fourth controller port 110d, and sends an adjustable inductor adjustment signal for adjusting the value of the adjustable inductor to the adjustable device module 130 through the fifth controller port 110e.

[0041] The comparison module 120, as Figure 3 shown, includes: a comparator 121 and a feedback resistor R f ; The comparator 121 has: a non-inverting input terminal 121a, an inverting input terminal 121b, a comparator output terminal 121c, a comparator power supply terminal 121d, and a comparator ground terminal 121e; The non-inverting input terminal 121a serves as the first comparison module port 120a, and the inverting input terminal 121b is in series with the feedback resistor R fIt is connected to the output terminal 121c of the comparator at the back. The power supply terminal 121d of the comparator serves as the third comparator module port 120c, and the ground terminal 121e of the comparator is grounded.

[0042] The adjustable device module 130, such as Figure 4 as shown, includes: adjustable resistor R v , adjustable capacitor C v and adjustable inductor L v ; One end of the adjustable resistor R v is connected to one end of the adjustable capacitor C v and serves as the first adjustable port 130a. The other end of the adjustable resistor R v is connected to one end of the adjustable inductor L v . The other end of the adjustable inductor L v is connected to the other end of the adjustable capacitor C v and serves as the second adjustable port 130b; The resistance adjustment port of the adjustable resistor serves as the third adjustable port 130c, the capacitance adjustment port of the adjustable capacitor serves as the fourth adjustable port 130d, and the inductance adjustment port of the adjustable inductor serves as the fifth adjustable port 130e.

[0043] The adjustable device module can adjust the values of the internal adjustable resistor, adjustable capacitor, and adjustable inductor respectively according to the adjustable resistor adjustment signal, adjustable capacitor adjustment signal, and adjustable inductor adjustment signal sent by the controller, thereby suppressing the ripple of the synchronous rectification branch.

[0044] Embodiment 2 This embodiment describes a ripple suppression method, which is applied to the controller of the switching power supply ripple adjustment system described in Embodiment 1 and includes: S100: In response to obtaining the ripple adjustment signal, start the switching power supply ripple adjustment system and obtain the output branch sampling signal of the switching power supply; S200: Determine the adjustable device adjustment signal according to the output branch sampling signal, where the adjustable device adjustment signal includes: adjustable resistor adjustment signal, adjustable capacitor adjustment signal, and adjustable inductor adjustment signal; S300: Adjust the adjustable resistor in the switching power supply ripple adjustment system according to the adjustable resistor adjustment signal, adjust the adjustable capacitor in the switching power supply ripple adjustment system according to the adjustable capacitor adjustment signal, and adjust the adjustable inductor in the switching power supply ripple adjustment system according to the adjustable inductor adjustment signal to reduce the output ripple of the switching power supply.

[0045] The ripple suppression method described in this embodiment corresponds to the situation where the ripple increases due to the increase in the synchronous rectification frequency.

[0046] Accordingly, S200: Determine the adjustable device adjustment signal based on the output branch sampling signal. The specific content includes: S210: Determine the synchronous rectification frequency of the switching power supply based on the output branch sampling signal to stabilize the output branch voltage of the switching power supply. Among them, the synchronous rectification frequency is determined by the output voltage of the output branch; S220: Determine the adjustable device adjustment signal based on the output branch sampling signal and the change in the synchronous rectification frequency.

[0047] In some embodiments, the increase in ripple is caused by the increase in the synchronous rectification frequency. Accordingly, S221a: In response to the increase in the synchronous rectification frequency, then according to L adj = L 0· ( 1 + k 1· Δ f / f nom ), determine the target value of the adjustable inductor, where, L adj represents the adjusted target value of the adjustable inductor, L 0 represents the initial value of the inductor before adjustment, k 1 represents the inductor compensation coefficient, Δ f = f sw - f nom , represents the frequency change amount, f sw represents the current synchronous rectification frequency, f nom represents the rated resonance frequency; S222a: According to C adj = C 0· ( 1 - k 2· Δ V r / V o ), determine the target value of the adjustable capacitor, where, C adj represents the adjusted target value of the adjustable capacitor, C 0 represents the initial value of the capacitor before adjustment, k 2 represents the capacitor attenuation coefficient, Δ V r represents the peak-to-peak ripple voltage, V o represents the output voltage of the synchronous rectification branch; S223a: According to R adj = R 0· ( 1 +k 3·Δ f / f nom ), determine the target value of the adjustable resistor, where R adj represents the adjusted target value of the adjustable resistor, R 0 represents the initial value of the resistor before adjustment, k 3 represents the damping coefficient; S224a: Generate an adjustable inductor adjustment signal according to the target value of the adjustable inductor, generate an adjustable capacitor adjustment signal according to the target value of the adjustable capacitor, and generate an adjustable resistor adjustment signal according to the target value of the adjustable resistor.

[0048] The adjustable inductor among them is a magnetic saturation reactor. The controller converts the control signal or pulse width modulation signal generated by the digital-to-analog converter into a direct current signal and inputs the direct current into the winding of the reactor to adjust the saturation of the magnetic core, thereby changing the inductance value of the winding.

[0049] The adjustable capacitor is a varactor diode. The adjustable capacitor is generated by the digital-to-analog converter in the controller. The controller outputs a control signal to reverse bias the varactor diode and change the reverse bias voltage of the varactor diode to adjust the capacitance of the varactor diode.

[0050] The adjustable resistor is a digital potentiometer. The controller 110 sends an instruction to the third adjustable port 130c through the SPI or I 2 C bus to directly adjust the resistance value inside the digital potentiometer. Taking the transmission of instructions through the I 2 C bus as an example, the I 2 C bus is correspondingly connected to the SCL and SDA pins of the digital potentiometer. The digital potentiometer receives the control signal through the I 2 C bus and adjusts the resistance value according to the control signal.

[0051] Embodiment III This embodiment describes a ripple suppression method applied to the controller of the switching power supply ripple adjustment system described in Embodiment I, including: S100: In response to obtaining the ripple adjustment signal, start the switching power supply ripple adjustment system and obtain the output branch sampling signal of the switching power supply; S200: Determine the adjustable device adjustment signal according to the output branch sampling signal, where the adjustable device adjustment signal includes: adjustable resistor adjustment signal, adjustable capacitor adjustment signal, and adjustable inductor adjustment signal; S300: Adjust the adjustable resistor in the switching power supply ripple adjustment system according to the adjustable resistor adjustment signal, adjust the adjustable capacitor in the switching power supply ripple adjustment system according to the adjustable capacitor adjustment signal, and adjust the adjustable inductor in the switching power supply ripple adjustment system according to the adjustable inductor adjustment signal to reduce the output ripple of the switching power supply.

[0052] The ripple suppression method described in this embodiment corresponds to the case where the ripple increases due to the decrease in the synchronous rectification frequency.

[0053] Correspondingly, S200: Determine the adjustable device adjustment signal according to the output branch sampling signal. The specific content includes: S221b: In response to the decrease in the synchronous rectification frequency, then according to L adj = L 0·(1 - k 4·Δ V r / V o ), determine the target value of the adjustable inductor, where L adj represents the adjusted target value of the adjustable inductor, L 0 represents the initial value of the inductor before adjustment, k 4 represents the inductor attenuation coefficient, Δ V r represents the peak-to-peak value of the ripple voltage, V o represents the output voltage of the synchronous rectification branch; S222b: According to C adj = C 0·(1 + k 5·Δ I / I nom ), determine the target value of the adjustable capacitor, where C adj represents the adjusted target value of the adjustable capacitor, C 0 represents the initial value of the capacitor before adjustment, k 5 represents the capacitor enhancement coefficient, Δ I = I load - I nom , represents the change in load current, I load represents the current load current, I nom represents the rated load current; S223b: R adj = R0·(1 - k 6·Δ f / f nom ), determine the target value of the adjustable resistor, where R adj represents the adjusted target value of the adjustable resistor, R 0 represents the initial value of the resistor before adjustment, k 6 represents the resistance attenuation coefficient, Δ f = f sw - f nom , represents the frequency change amount, f sw represents the current synchronous rectification frequency, f nom represents the rated resonance frequency; S224b: Generate an adjustable inductor adjustment signal according to the target value of the adjustable inductor, generate an adjustable capacitor adjustment signal according to the target value of the adjustable capacitor, and generate an adjustable resistor adjustment signal according to the target value of the adjustable resistor.

[0054] Among them, the adjustable inductor is a switched inductor array. The switched inductor array of the adjustable inductor uses multiple fixed-value inductors and relays, and controls the on-off state of the relays to select different inductor combinations to adjust the inductor value. The control signal generated by the controller is used to control the on and off states of the corresponding relay contacts to adjust the inductor array to reach the target inductance value.

[0055] The adjustable capacitor is a capacitor array. It uses multiple fixed-value capacitors and relays, and controls the on-off state of the relays to select different capacitor combinations to adjust the capacitor value to reach the target capacitor value.

[0056] The adjustable resistor is a junction field effect transistor. Its gate receives the control signal sent by the controller to change the resistance between its drain and source. The control signal for the junction field effect transistor is a pulse width modulation signal.

[0057] Embodiment 4 This embodiment describes a ripple suppression method, which is applied to the controller of the switching power supply ripple adjustment system described in Embodiment 1, and includes: S100: In response to obtaining the ripple adjustment signal, start the switching power supply ripple adjustment system and obtain the output branch sampling signal of the switching power supply; S200: Determine the adjustable device adjustment signal according to the output branch sampling signal, where the adjustable device adjustment signal includes: adjustable resistor adjustment signal, adjustable capacitor adjustment signal, and adjustable inductor adjustment signal; S300: Adjust the variable resistor in the switching power supply ripple adjustment system according to the variable resistor adjustment signal, adjust the variable capacitor in the switching power supply ripple adjustment system according to the variable capacitor adjustment signal, and adjust the variable inductor in the switching power supply ripple adjustment system according to the variable inductor adjustment signal to reduce the output ripple of the switching power supply.

[0058] The ripple suppression method described in this embodiment corresponds to the case where the sampling signal of the output branch indicates that the switching power supply ripple becomes larger.

[0059] Correspondingly, S200: Determine the adjustable device adjustment signal according to the output branch sampling signal. The specific content includes: S221c: In response to the sampling signal of the output branch indicating that the switching power supply ripple becomes larger, then according to L adj = L 0 + Δ L , determine the target value of the variable inductor. According to C adj = C 0 + Δ C , determine the target value of the variable capacitor. According to, R adj = R 0 + Δ R = R 0 · ( f do / f nom ) -1 / 2 , determine the target value of the variable resistor, where L adj represents, L 0 represents, C adj represents, C 0 represents, R adj represents, R 0 represents, Δ L represents, Δ C represents, Δ R represents, Δ L 、Δ C 、Δ R According to Δ V r = k L · Δ L + k C · Δ C + k R · Δ R And fre = 1 / 2π( Ladj · C adj ) -1 / 2 By solving simultaneously, we get Δ V r represents the peak-to-peak value of the ripple voltage, k L represents the inductance sensitivity coefficient, k C represents the capacitance sensitivity coefficient, k R represents the resistance sensitivity coefficient, f re represents the resonant frequency, f do represents the main frequency of the ripple energy, f nom represents the rated resonant frequency; S222c: Generates an adjustable inductor adjustment signal according to the target value of the adjustable inductor, generates an adjustable capacitor adjustment signal according to the target value of the adjustable capacitor, and generates an adjustable resistor adjustment signal according to the target value of the adjustable resistor.

[0060] The adjustable inductor among them is a magnetic saturation reactor. The controller converts the control signal or pulse width modulation signal generated by the digital-to-analog converter into a direct current signal, and inputs this direct current into the winding of the reactor to adjust the saturation degree of the magnetic core, thereby changing the inductance value of the winding.

[0061] The adjustable capacitor is a varactor diode. The adjustable capacitor is generated by the digital-to-analog converter in the controller. The controller outputs a control signal to reverse bias the varactor diode and change the reverse bias voltage of the varactor diode to adjust the capacitance of the varactor diode.

[0062] The adjustable resistor is a digital potentiometer. The controller 110 sends instructions to the third adjustable port 130c through the SPI or I 2 C bus to directly adjust the resistance value inside the digital potentiometer. Taking the transmission of instructions through the I 2 C bus as an example, the I 2 C bus is correspondingly connected to the SCL and SDA pins of the digital potentiometer. The digital potentiometer receives the control signal through the I 2 C bus and adjusts the resistance value according to the control signal. It shows that, however, these steps are not necessarily executed in the order indicated by the arrows. Unless there is a clear description in this article, the execution of these steps has no strict order limit, and these steps can be executed in other orders. Moreover, Figure 4At least a part of the steps may include multiple sub-steps or multiple stages. These sub-steps or stages do not necessarily need to be completed at the same moment, but can be executed at different moments. The execution order of these sub-steps or stages is not necessarily sequential, but can be executed alternately or in turn with at least a part of other steps or sub-steps or stages of other steps.

[0063] The beneficial effects brought by the technical solutions provided by the embodiments of the present application are as follows: By implementing a switching power supply ripple adjustment system and a ripple suppression method provided by the embodiments of the present application, it is possible to quickly suppress the output ripple and improve the power quality by means of active intervention adjustment according to the synchronous rectification frequency of the switching power supply and the sampling signal of the synchronous rectification branch.

[0064] Those skilled in the art can further realize that the units and algorithm steps of each example described in combination with the embodiments disclosed herein can be implemented by electronic hardware, computer software, or a combination of the two. To clearly illustrate the interchangeability of hardware and software, the composition and steps of each example have been generally described according to functions in the above description. Whether these functions are executed in a hardware or software manner depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered to exceed the scope of the present application.

[0065] Each embodiment in this specification is described in a progressive manner. The same or similar parts among the embodiments can be referred to each other, and the key point of each embodiment is to illustrate the differences from other embodiments. In particular, for a system or system embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment. The systems and system embodiments described above are only illustrative. The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they can be located in one place or distributed to multiple network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the solution of this embodiment. Those of ordinary skill in the art can understand and implement it without creative efforts.

[0066] The above has introduced the technical solutions provided by the present application in detail. Specific examples are used herein to elaborate on the principles and implementation manners of the present application. The description of the above embodiments is only used to help understand the method and its core idea of the present application; at the same time, for those of ordinary skill in the art, there will be changes in the specific implementation manners and application scopes according to the idea of the present application. In summary, the content of this specification should not be construed as a limitation to the present application.

[0067] The above has introduced in detail a switching power supply ripple adjustment system and a ripple suppression method provided by the present application. Specific examples are used in this article to elaborate on the principle and implementation manner of the present application. The above embodiments are only the preferred embodiments of the present application, which are used to help understand the method and its core idea of the present application, and are not intended to limit the present application. It should be noted that for those of ordinary skill in the art in this technical field, without departing from the principle of the present application, any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application also fall within the protection scope of the claims of the present application.

Claims

1. A switching power supply ripple adjustment system, characterized in that, Comprising: A ripple processing module, a synchronous rectification module, a rectified output capacitor, and at least one synchronous rectification branch; Any one of the at least one synchronous rectification branches includes a synchronous rectification transistor and a secondary side coil connected in series; The ripple processing module is connected to the rectified output capacitor, the ripple processing module is connected to the synchronous rectification module, the rectified output capacitor is connected to the synchronous rectification transistor, and the synchronous rectification module is connected to the synchronous rectification transistor in any one of the synchronous rectification branches; The ripple processing module is configured to collect a branch sampling signal on the rectified output capacitor, and obtain the synchronous rectification frequency of the synchronous rectification module, and suppress the ripple on the synchronous rectification branch according to the branch sampling signal and the change of the synchronous rectification frequency.

2. The switching power supply ripple adjustment system according to claim 1, wherein, The ripple processing module includes: a controller, a comparison module, an adjustable device module, a switch, and a sampling resistor; Two ends of the sampling resistor are respectively connected to a first comparison module port of the comparison module and a third comparison module port of the comparison module; the first comparison module port of the comparison module is further connected to a second switch port of the switch, a third switch port of the switch is connected to a second comparison module port of the comparison module, the second comparison module port of the comparison module is further connected to a first adjustable port of the adjustable device module, a second adjustable port of the adjustable device module is connected to the third comparison module port of the comparison module, a first switch port of the switch is connected to a first controller port of the controller, a third controller port of the controller is connected to a third adjustable port of the adjustable device module, a fourth controller port of the controller is connected to a fourth adjustable port of the adjustable device module, and a fifth controller port of the controller is connected to a fifth adjustable port of the adjustable device module; A second controller port of the controller is used to obtain a received ripple adjustment signal; The controller sends an adjustable resistor adjustment signal for adjusting the value of the adjustable resistor to the adjustable device module through the third controller port, sends an adjustable capacitor adjustment signal for adjusting the value of the adjustable capacitor to the adjustable device module through the fourth controller port, and sends an adjustable inductor adjustment signal for adjusting the value of the adjustable inductor to the adjustable device module through the fifth controller port.

3. The switching power supply ripple adjustment system according to claim 2, wherein The comparison module includes: a comparator and a feedback resistor; The comparator has: a non-inverting input terminal, an inverting input terminal, a comparator output terminal, a comparator power supply terminal, and a comparator ground terminal; The non-inverting input terminal serves as the first comparison module port, the inverting input terminal is connected to the comparator output terminal in series with the feedback resistor, the comparator power supply terminal serves as the third comparison module port, and the comparator ground terminal is grounded.

4. The switching power supply ripple adjustment system according to claim 2, wherein The adjustable device module includes: an adjustable resistor, an adjustable capacitor, and an adjustable inductor; One end of the adjustable resistor is connected to one end of the adjustable capacitor and serves as the first adjustable port. The other end of the adjustable resistor is connected to one end of the adjustable inductor, and the other end of the adjustable inductor is connected to the other end of the adjustable capacitor and serves as the second adjustable port. The resistance adjustment port of the adjustable resistor serves as the third adjustable port, the capacitance adjustment port of the adjustable capacitor serves as the fourth adjustable port, and the inductance adjustment port of the adjustable inductor serves as the fifth adjustable port.

5. A ripple suppression method, characterized in that, A controller applied to the switching power supply ripple adjustment system according to any one of claims 1-4, comprising: In response to obtaining a ripple adjustment signal, start the switching power supply ripple adjustment system and obtain the output branch sampling signal of the switching power supply. Determine an adjustable device adjustment signal according to the output branch sampling signal, wherein the adjustable device adjustment signal includes: an adjustable resistor adjustment signal, an adjustable capacitor adjustment signal, and an adjustable inductor adjustment signal. Adjust the adjustable resistor in the switching power supply ripple adjustment system according to the adjustable resistor adjustment signal, adjust the adjustable capacitor in the switching power supply ripple adjustment system according to the adjustable capacitor adjustment signal, and adjust the adjustable inductor in the switching power supply ripple adjustment system according to the adjustable inductor adjustment signal to reduce the output ripple of the switching power supply.

6. The ripple suppression method according to claim 5, characterized in that The determining the adjustable device adjustment signal according to the output branch sampling signal includes: Determine the synchronous rectification frequency of the switching power supply according to the output branch sampling signal to stabilize the output branch voltage of the switching power supply, wherein the synchronous rectification frequency is determined by the output voltage of the output branch. Determine the adjustable device adjustment signal according to the output branch sampling signal and the change of the synchronous rectification frequency.

7. The ripple suppression method according to claim 6, wherein The determining the adjustable device adjustment signal according to the output branch sampling signal and the change of the synchronous rectification frequency includes: In response to the increase in the synchronous rectification frequency, then according to L adj = L 0·(1 + k 1·Δ f / f nom ), determine the target value of the adjustable inductor, where L adj represents the adjusted target value of the adjustable inductor, L 0 represents the initial value of the inductor before adjustment, k 1 represents the inductor compensation coefficient, Δ f = f sw - f nom , represents the frequency change amount, f sw represents the current synchronous rectification frequency, f nom represents the rated resonance frequency; According to C adj = C 0·(1 - k 2·Δ V r / V o ), determine the target value of the adjustable capacitor, where C adj represents the target value of the adjustable capacitor after adjustment, C 0 represents the initial value of the capacitor before adjustment, k 2 represents the capacitance attenuation coefficient, Δ V r represents the peak-to-peak value of the ripple voltage, V o represents the output voltage of the synchronous rectification branch; According to R adj = R 0·(1 + k 3·Δ f / f nom ), determine the target value of the adjustable resistor, where R adj represents the target value of the adjustable resistor after adjustment, R 0 represents the initial value of the resistor before adjustment, k 3 represents the damping coefficient; Generate an adjustable inductor adjustment signal according to the target value of the adjustable inductor, generate an adjustable capacitor adjustment signal according to the target value of the adjustable capacitor, and generate an adjustable resistor adjustment signal according to the target value of the adjustable resistor.

8. The ripple suppression method according to claim 6, wherein The determining the adjustable device adjustment signal according to the output branch sampling signal and the change of the synchronous rectification frequency further includes: In response to the reduction of the synchronous rectification frequency, according to L adj = L 0·(1 - k 4·Δ V r / V o ), determine the target value of the adjustable inductor, where L adj represents the adjusted target value of the adjustable inductor, L 0 represents the initial value of the inductor before adjustment, k 4 represents the inductor attenuation coefficient, Δ V r represents the peak-to-peak value of the ripple voltage, V o represents the output voltage of the synchronous rectification branch; According to C adj = C 0·(1 + k 5·Δ I / I nom ), determine the target value of the adjustable capacitor, where C adj represents the adjusted target value of the adjustable capacitor, C 0 represents the initial value of the capacitor before adjustment, k 5 represents the capacitance enhancement coefficient, Δ I = I load - I nom , represents the change in load current, I load represents the current load current, I nom represents the rated load current; R adj = R 0·(1 - k 6·Δ f / f nom ) to determine the target value of the adjustable resistor, where R adj represents the adjusted target value of the adjustable resistor, R 0 represents the initial value of the resistor before adjustment, k 6 represents the resistor attenuation coefficient, Δ f = f sw - f nom , represents the frequency change amount, f sw represents the current synchronous rectification frequency, f nom represents the rated resonance frequency; Generate an adjustable inductor adjustment signal according to the target value of the adjustable inductor, generate an adjustable capacitor adjustment signal according to the target value of the adjustable capacitor, and generate an adjustable resistor adjustment signal according to the target value of the adjustable resistor.

9. The ripple suppression method according to claim 6, wherein The determining the adjustable device adjustment signal according to the output branch sampling signal and the change of the synchronous rectification frequency further includes: In response to the output branch sampling signal indicating that the switching power supply ripple becomes larger, then according to L adj = L 0 + Δ L , determine the target value of the adjustable inductor. According to C adj = C 0 + Δ C , determine the target value of the adjustable capacitor. According to R adj = R 0 + Δ R = R 0·( f do / f nom ) -1 / 2 , determine the target value of the adjustable resistor, where L adj represents L 0 represents C adj represents C 0 represents R adj represents R 0 represents, Δ L represents, Δ C represents, Δ R represents, Δ L 、Δ C 、Δ R According to Δ V r = k L ·Δ L + k C ·Δ C + k R ·Δ R and fre = 1 / 2π( L adj · C adj ) -1 / 2 Solve the equations simultaneously to obtain, Δ V r represents the peak-to-peak value of the ripple voltage, k L represents the inductance sensitivity coefficient, k C represents the capacitance sensitivity coefficient, k R represents the resistance sensitivity coefficient, f re represents the resonant frequency, f do Indicates the main frequency of the ripple energy, f nom Indicates the rated resonant frequency; Generate an adjustable inductor adjustment signal according to the target value of the adjustable inductor, generate an adjustable capacitor adjustment signal according to the target value of the adjustable capacitor, and generate an adjustable resistor adjustment signal according to the target value of the adjustable resistor.

10. The ripple suppression method according to claim 5, characterized in that Before the response to obtaining the ripple adjustment signal, further includes: In response to the electrical appliance powered by the switching power supply being turned on, generate the ripple adjustment signal. In response to starting the shutdown process of the electrical appliance, generate the ripple adjustment signal. In response to the change of the load of the electrical appliance, generate the ripple adjustment signal.

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