Power device, power supply device, communication device and voltage stabilization control method

Abstract

Disclosed in the present application are a power device, a power supply device, a communication device and a voltage stabilization control method. The power device comprises a power circuit, an input capacitor and a voltage stabilization apparatus. The voltage stabilization apparatus comprises a power conversion circuit, a storage capacitor and a control circuit, wherein the control circuit controls the operation of the power conversion circuit on the basis of parameter information in response to the maximum absolute value of an oscillation difference being greater than a set threshold value during the process of the oscillation difference switching between positive and negative values, adjusts a current flowing through an input end of the power conversion circuit, changes the voltage of the input capacitor, and gradually reduces the oscillation difference, such that the absolute value of the oscillation difference of the voltage of the input capacitor is less than or equal to the set threshold value. Since the voltage of an input capacitor is the same as the voltage of an input end of a power circuit, the aim of stabilizing the voltage of the input end of the power circuit can be achieved by adjusting the voltage of the input capacitor, thereby achieving the effect of suppressing periodic voltage oscillation at an input end of a power device.

Description

A power supply device, a power supply equipment, a communication device, and a voltage stability control method.

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to Chinese Patent Application No. 202410516603.0, filed on April 26, 2024, with the invention entitled "A power supply device, power supply equipment, communication equipment and voltage stabilization control method", the entire contents of which are incorporated herein by reference. Technical Field

[0003] This application relates to the field of power supply technology, and in particular to a power supply device, power supply equipment, communication equipment, and voltage stabilization control method. Background Technology

[0004] A power supply device is a device that converts input voltage and outputs it to power electrical equipment. Typically, the input terminal of the power supply device is connected to the output terminal of a preceding power supply device via wiring, with the preceding power supply device providing DC power. Due to parasitic inductance and resistance on the wiring, it's equivalent to connecting an inductor and resistor in series between the preceding power supply device and the power supply device. Furthermore, the input terminal of the power supply device is usually connected in parallel with a bus capacitor or resistor-capacitor (RC). Therefore, the parasitic inductance and resistance on the wiring, the parallel bus capacitor or RC at the input terminal, and power mismatches caused by variations in power output from the electrical equipment side can lead to voltage fluctuations at the power supply device's input terminal. Summary of the Invention

[0005] This application provides a power supply device, a power supply equipment, a communication device, and a voltage stabilization control method to improve the voltage fluctuation phenomenon at the input terminal of the power supply device.

[0006] In a first aspect, embodiments of this application provide a power supply device, which includes a power supply circuit, an input capacitor, and a voltage stabilizing device. The input terminal of the power supply circuit receives an input voltage, and the output terminal of the power supply circuit is connected to an electrical device. The power supply circuit converts the input voltage and outputs it to the electrical device. The input capacitor is connected in parallel with the input terminal of the power supply circuit. The voltage stabilizing device includes a power conversion circuit, a storage capacitor, and a control circuit. The input terminal of the power conversion circuit is connected in parallel with the input terminal of the power supply circuit, and the output terminal of the power conversion circuit is connected to the storage capacitor. The difference between the voltage of the input capacitor and the reference voltage at the input terminal of the power supply circuit is used as the oscillation difference. The oscillation difference switches between positive and negative values. Specifically, during the same period when the oscillation difference is positive, the voltage of the input capacitor first increases and then decreases. During the same period when the oscillation difference is negative, the voltage of the input capacitor first decreases and then increases. Based on this, the control circuit can be used to respond to the switching between positive and negative values ​​of the oscillation difference. When the maximum absolute value of the oscillation difference exceeds a set threshold, the control circuit adjusts the current flowing through the input terminal of the power conversion circuit according to parameter information. This changes the voltage of the input capacitor, gradually reducing the oscillation difference of the input capacitor voltage, so that the absolute value of the oscillation difference of the input capacitor voltage is less than or equal to the set threshold. Since the voltage of the input capacitor is the same as the voltage at the input terminal of the power supply circuit, adjusting the voltage of the input capacitor can stabilize the voltage at the input terminal of the power supply circuit, thus suppressing the periodic oscillation of the voltage at the input terminal of the power supply device.

[0007] The parameter information includes at least the capacitor current flowing through the input capacitor, the circuit current flowing through the input terminal of the power conversion circuit, the actual capacitance value of the input capacitor, and the set compensation capacitor value.

[0008] For example, the capacitive current flowing through the input capacitor and the circuit current flowing through the input terminal of the power conversion circuit can be acquired using a current sampling unit. The actual capacitance value of the input capacitor and the set compensation capacitance value can be stored in the control circuit, where the set compensation capacitance value is the inductive reactance value to be provided by the power conversion circuit.

[0009] The power supply device in this application achieves the effect of suppressing periodic voltage oscillations at the input terminal of the power supply device without requiring series inductors or additional parallel capacitors and resistors in the wiring or at the input terminal. Furthermore, power conversion circuits are generally mature and highly integrated; integrating the voltage stabilization device of this application into the power supply device will not excessively increase its size. Additionally, the voltage stabilization device in this embodiment can ensure voltage stability at the input terminal of the power supply device even when the input voltage and the power-consuming equipment are different.

[0010] Furthermore, the power conversion circuit in this application is connected in parallel with the input terminal of the power supply device, eliminating the need to convert the voltage on the traces before outputting it to the power supply device. This avoids excessive losses and improves the conversion efficiency of the power supply device.

[0011] Furthermore, this application does not require adding a function to control the stability of its input voltage inside the power supply device. When the power supply device controls the stability of its output voltage through feedback, the problem of unstable operation can be avoided.

[0012] Furthermore, the voltage stabilization device in this application incorporates a storage capacitor, which significantly reduces the size of the power supply compared to using a battery. This is especially beneficial for applications requiring small-sized power supplies, as it avoids excessively increasing the overall size of the power supply unit.

[0013] In this application, due to the inclusion of a power conversion circuit and a storage capacitor, the control circuit can control the current to flow forward into the power conversion circuit when adjusting its operating current. In this case, the storage capacitor can carry the energy, ensuring the stable operation of the power conversion circuit. Conversely, the control circuit can also control the current to flow backward out of the power conversion circuit when adjusting its operating current. In this case, the storage capacitor can provide energy, ensuring the stable operation of the power conversion circuit.

[0014] In some embodiments, the control circuit is further configured to respond to a positive oscillation difference and a maximum value of the oscillation difference being greater than a set threshold, and control the power conversion circuit to operate according to parameter information, so that the current at the input terminal of the power conversion circuit flows into the power conversion circuit, thereby gradually reducing the absolute value of the oscillation difference and achieving the purpose of stabilization, thus suppressing the periodic voltage oscillation at the input terminal of the power supply device.

[0015] In some embodiments, during the flow of current into the input terminal of the power conversion circuit, the magnitude of the current flowing into the input terminal first increases and then decreases. This allows the magnitude of the current flowing into the input terminal of the power conversion circuit to change with the voltage, thereby improving the voltage stability of the input terminal of the power conversion circuit.

[0016] In some embodiments, during a series of different stages where the oscillation difference is positive, the maximum value of the oscillation difference decreases sequentially, and the maximum value of the current flowing into the input terminal of the power conversion circuit decreases sequentially, further improving the voltage stability of the input terminal of the power conversion circuit. Furthermore, during a series of different stages where the oscillation difference is positive, the maximum value of the current flowing into the input terminal of the power conversion circuit can be decreased by the same or different values ​​sequentially.

[0017] In some embodiments, the control circuit is further configured to respond to a negative oscillation difference and a maximum absolute value of the oscillation difference exceeding a set threshold, and control the power conversion circuit to operate according to parameter information, so that the current at the input terminal of the power conversion circuit flows out of the power conversion circuit, thereby gradually reducing the absolute value of the oscillation difference and achieving stabilization, thus suppressing the periodic voltage oscillation at the input terminal of the power supply device.

[0018] In some embodiments, during the process of current flowing out of the power conversion circuit from its input terminal, the magnitude of the current flowing out of the input terminal first increases and then decreases. This allows the magnitude of the current flowing out of the input terminal of the power conversion circuit to change with the voltage, thereby improving the voltage stability at the input terminal of the power conversion circuit.

[0019] In some embodiments, during a series of different stages where the oscillation difference is negative, the maximum absolute value of the oscillation difference decreases sequentially, and the maximum value of the current flowing out of the input terminal of the power conversion circuit decreases sequentially, further improving the voltage stability of the input terminal of the power conversion circuit. Furthermore, during a series of different stages where the oscillation difference is negative, the maximum value of the current flowing out of the input terminal of the power conversion circuit can be decreased by the same or different values ​​sequentially.

[0020] In some embodiments, controlling the operation of the power conversion circuit includes outputting a drive signal to the power conversion circuit; wherein the duty cycle of the drive signal is determined based on parameter information. With this configuration, the control circuit can output a drive signal to the power conversion circuit, controlling the on / off state of the switches in the power conversion circuit through the drive signal, thereby adjusting the direction and magnitude of the current at the input terminal of the power conversion circuit. The drive signal is a pulse width modulation (PWM) signal, which has a duty cycle; therefore, by adjusting the duty cycle, the on / off state of the switches in the power conversion circuit can be adjusted, thereby adjusting the direction and magnitude of the current at the input terminal of the power conversion circuit.

[0021] In some embodiments, the parameter information includes the capacitor current flowing through the input capacitor, the circuit current flowing through the input terminal of the power conversion circuit, the actual capacitance value of the input capacitor, and a set compensation capacitor value. The control circuit is further configured to determine the target current based on the capacitor current, the actual capacitance value, and the set compensation capacitor value. Furthermore, it determines the duty cycle of the drive signal based on the difference between the target current and the circuit current. This configuration allows for the adjustment of the direction and magnitude of the current at the input terminal of the power conversion circuit.

[0022] In some embodiments, the parameter information includes not only the capacitor current flowing through the input capacitor, the circuit current flowing through the input terminal of the power conversion circuit, the actual capacitance value of the input capacitor, and the set compensation capacitor value, but also the voltage of the input capacitor and the voltage of the storage capacitor. Based on this, the control circuit is further configured to determine a target current based on the capacitor current, the actual capacitance value, and the set compensation capacitor value, and to determine a target voltage based on the difference between the target current and the circuit current. Furthermore, it determines the duty cycle of the drive signal based on the target voltage, the voltage of the input capacitor, and the voltage of the storage capacitor. This configuration allows for the adjustment of the direction and magnitude of the current at the input terminal of the power conversion circuit.

[0023] In some embodiments, the control circuit is further configured to control the power conversion circuit to stop operating in response to the maximum value of the absolute value of the oscillation difference being less than or equal to a set threshold. Based on this, the power conversion circuit can prevent power loss from the power supply device, thereby significantly reducing power loss and improving conversion efficiency. Furthermore, when the power conversion circuit stops operating, the input voltage of the power supply device can be stabilized by using an input capacitor.

[0024] In some embodiments, the power conversion circuit includes a boost circuit, a buck circuit, a buck-boost circuit, an LLC circuit, or a dual active full-bridge circuit. This configuration allows for a power conversion circuit with a simple structure. Furthermore, in practical applications, the topologies of boost circuits, buck circuits, buck-boost circuits, LLC circuits, or dual active full-bridge circuits are relatively mature, making the implementation of the power conversion circuit relatively simple, thereby reducing design complexity and production costs. Additionally, it can replenish more electrical energy in the event of supply voltage changes or sudden loads on electrical equipment, preventing power outages at the input and output of the power supply equipment.

[0025] Secondly, embodiments of this application also provide a power supply device, which includes: one or more power supply devices described in the first aspect or any possible implementation of the first aspect.

[0026] Thirdly, embodiments of this application also provide a communication device, which includes an electrical device and a power supply device as described in the second aspect or any possible implementation thereof, wherein the output terminal of the power supply device is connected to the electrical device.

[0027] Fourthly, this application also provides a voltage stabilization control method. This method is applied to a power supply device, which includes a power supply circuit, an input capacitor, and a voltage stabilization device. The input terminal of the power supply circuit is used to receive an input voltage, and the output terminal of the power supply circuit is used to connect to the electrical device. The power supply circuit is used to convert the input voltage and output it to the electrical device. The input capacitor is connected in parallel with the input terminal of the power supply circuit. The voltage stabilization device includes a power conversion circuit and a storage capacitor. The input terminal of the power conversion circuit is connected in parallel with the input terminal of the power supply circuit, and the output terminal of the power conversion circuit is connected to the storage capacitor. Furthermore, the method includes: responding to the switching between positive and negative values ​​of the oscillation difference, where the maximum absolute value of the oscillation difference is greater than a set threshold, controlling the operation of the power conversion circuit according to parameter information, and adjusting the current flowing through the input terminal of the power conversion circuit so that the absolute value of the oscillation difference of the input capacitor voltage is less than or equal to the set threshold; wherein, the parameter information includes at least the capacitor current flowing through the input capacitor, the circuit current flowing through the input terminal of the power conversion circuit, the actual capacitance value of the input capacitor, and the set compensation capacitor value; the oscillation difference is the difference between the voltage of the input capacitor and the reference voltage at the input terminal of the power supply circuit, wherein in the same stage where the oscillation difference is positive, the voltage of the input capacitor first increases and then decreases, and in the same stage where the oscillation difference is negative, the voltage of the input capacitor first decreases and then increases.

[0028] Furthermore, the technical effects of the corresponding solutions in the second to fourth aspects can be referred to the technical effects that can be obtained by the corresponding solutions in the first aspect, and the repetitions will not be detailed. Attached Figure Description

[0029] Figure 1 is a structural block diagram of a communication device provided in an embodiment of this application;

[0030] Figures 2a to 2d are schematic diagrams of a power supply device provided in an embodiment of this application;

[0031] Figure 3a is a schematic diagram of the voltage at the input terminal of the power supply device provided in an embodiment of this application oscillating periodically;

[0032] Figure 3b is another schematic diagram showing the periodic oscillation of the voltage at the input terminal of the power supply device provided in the embodiment of this application;

[0033] Figure 3c is another schematic diagram showing the periodic oscillation of the voltage at the input terminal of the power supply device provided in the embodiment of this application;

[0034] Figure 4 is a schematic diagram of a power stabilization device provided in an embodiment of this application;

[0035] Figure 5a is a schematic diagram of a boost circuit provided in an embodiment of this application;

[0036] Figure 5b is a schematic diagram of a circuit structure of a buck circuit provided in an embodiment of this application;

[0037] Figure 5c is a schematic diagram of a circuit structure of the buck-boost circuit provided in an embodiment of this application;

[0038] Figure 5d is a schematic diagram of another circuit structure of the buck-boost circuit provided in the embodiment of this application;

[0039] Figure 5e is a schematic diagram of a circuit structure of a dual active full-bridge circuit provided in an embodiment of this application;

[0040] Figure 5f is a schematic diagram of a circuit structure of an LLC circuit provided in an embodiment of this application;

[0041] Figure 6 is a schematic diagram of another structure of the power stabilization device provided in the embodiments of this application.

[0042] Figure reference numerals: 10 - Communication equipment; 100 - Power supply equipment; 110 - Power supply equipment; 120 - Power supply equipment; 121 - Power circuit; 122 - Voltage stabilizing device; 1221 - Power conversion circuit; 1222 - Control circuit; 200 - Electrical equipment; 311 - Boost circuit; 312 - Buck circuit; 313 / 314 - Buck-Boost circuit; 315 - Dual active full-bridge circuit; Bus+ - Positive trace; Bus- - Negative trace; V IN+ - Positive input terminal; VIN - Negative input terminal; VO+ - Positive output terminal; VO - Negative output terminal; S11\S12\S21\S22\S31\S32\S41\S42\S43\S44\S51\S52\S53\S54\S55\S56\S57\S58 - Switch; CN - Input capacitor; CH - Storage capacitor; L1\L2\L3\L4\L5 - Inductor; C0 - Capacitor; T - Transformer; 316 - LLC circuit. Detailed Implementation

[0043] To make the objectives, technical solutions, and advantages of this application clearer, the application will be further described in detail below with reference to the accompanying drawings. The specific operational methods in the method embodiments can also be applied to the device embodiments or system embodiments. It should be noted that in the description of this application, "at least one" refers to one or more, where "multiple" refers to two or more. Therefore, in the embodiments of this application, "multiple" can also be understood as "at least two". "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Furthermore, the character " / ", unless otherwise specified, generally indicates that the preceding and following related objects have an "or" relationship. And, words such as "first" and "second" are only used for distinguishing the purpose of description and should not be construed as indicating or implying relative importance or order. In addition, in the embodiments of this application, "connection" refers to electrical connection; the connection between two electrical components can be a direct connection between the two electrical components or an indirect connection through an intermediate medium. For example, A and B can be connected directly, or indirectly through one or more other electrical components, such as A and B being connected. Alternatively, A can be directly connected to C, C can be directly connected to B, and A and B can be connected through C.

[0044] It should be noted that the same reference numerals in the accompanying drawings of this application denote the same or similar structures, and therefore repeated descriptions of them will be omitted. Terms expressing position and direction described in this application are illustrative based on the accompanying drawings, but may be modified as needed, and all modifications are included within the scope of protection of this application. The accompanying drawings of this application are for illustrating relative positional relationships only and do not represent actual scale.

[0045] The switches in this application embodiment can be one or more of various types of switching devices, such as relays, metal-oxide-semiconductor field-effect transistors (MOSFETs), bipolar junction transistors (BJTs), insulated-gate bipolar transistors (IGBTs), silicon carbide (SiC) MOSFETs, GaN semiconductor devices, and Schottky diodes. These will not be listed exhaustively in this application embodiment. Furthermore, each switch can include a first terminal, a second terminal, and a control terminal, wherein the control terminal is used to control the closing or opening of the switch. When the switch is closed, current can be transferred between the first terminal and the second terminal. When the switch is open, no current can be transferred between the first terminal and the second terminal. Taking a MOSFET as an example, the control terminal of the switch is the gate, the first terminal of the switch can be the source, and the second terminal can be the drain, or the first terminal can be the drain and the second terminal can be the source.

[0046] The power supply device provided in this application embodiment can be applied to any power supply device that performs voltage conversion (e.g., direct current (DC) or alternating current (AC) voltage). The power supply device can be applied to communication equipment (e.g., base stations, servers) to supply power to the electrical devices within the communication equipment. Of course, the power supply device can also be applied to other devices, and this is not limited thereto. The power supply device, power supply equipment, and communication equipment provided in this application embodiment will be described below with reference to the accompanying drawings.

[0047] Figure 1 is a structural block diagram of a communication device provided in an embodiment of this application. Referring to Figure 1, the communication device 10 may include a power supply device 100 and a power consumption device 200. The power supply device 100 includes a power supply device 110 and a power supply device 120. The input terminal of the power supply device 110 is connected to an input power source, and the output terminal of the power supply device 110 is connected to the input terminal of the power supply device 120 via wiring (e.g., Bus+, Bus-). The output terminal of the power supply device 120 is connected to the power consumption device 200. During operation, the power supply device 120 can be a DC power supply device. The power supply device 110 can convert AC or DC power into DC power and output it to the wiring. The power supply device 120 can convert the DC power on the wiring (e.g., Bus+, Bus-) into DC or AC power and output it to the power consumption device 200, thus supplying power to the power consumption device 200. The power supply device 120 includes a power circuit. The input terminal of the power circuit receives input voltage, and the output terminal connects to the electrical device. The power circuit converts the input voltage and outputs it to the electrical device. Furthermore, the wiring has a positive wiring Bus+ and a negative wiring Bus-. The positive wiring Bus+ is connected to the positive input terminal of the power supply device 120, and the negative wiring Bus- is connected to the negative input terminal of the power supply device 120. Alternatively, the power supply device 120 can be an AC power supply device. In this case, the power supply device 110 can convert AC or DC power to AC power and output it to the wiring. The power supply device 120 can convert AC power on the wiring (e.g., Bus+, Bus-) to DC or AC power and output it to the electrical device 200 to supply power to the electrical device 200.

[0048] It is understood that one or more power supply devices may be provided. It is also understood that all power supply devices in the power supply equipment may be the power supply devices of this application, or a portion of the power supply devices in the power supply equipment may be the power supply devices of this application, while another portion may be the power supply devices of related technologies.

[0049] The electrical equipment 200 can be either AC or DC power supply equipment. For example, the electrical equipment 200 can be a computer, server, or hardware board, etc., and the power supply equipment can be a rectifier cabinet, battery, or conversion circuit. The power supply equipment in this embodiment can also be applied to applications that provide power to homes or businesses, for example, when the electrical equipment is an appliance (such as a refrigerator, air conditioner, etc.). The power supply equipment in this embodiment can also be applied to microgrids, such as photovoltaic microgrids.

[0050] The following description uses power supply device 120 as an example of a DC power supply device. The working process of power supply device 120 as an AC power supply device can be referred to the working process of power supply device 120 as a DC power supply device, and will not be elaborated here.

[0051] In some examples, referring to Figures 2a and 2b, which are schematic diagrams of a power supply device provided in an embodiment of this application, the input power supply can be a direct current (DC) power supply. The power supply device 110 may include a direct current-to-direct current (DC-DC) conversion circuit to convert the DC power from the input power supply into DC power before outputting it to the wiring. The power supply device 120 includes a power supply circuit. Referring to Figure 2a, this power supply circuit can be a DC-DC conversion circuit to convert the DC power on the wiring into DC power before outputting it to the power-consuming device 200 to power the DC power-consuming device. Alternatively, the power supply circuit can be configured as a DC-AC conversion circuit and an alternating current-to-direct current (AC-DC) conversion circuit, thereby first converting the DC power into alternating current, and then converting the alternating current back into DC power before outputting it to the power-consuming device to power the DC power-consuming device. Alternatively, referring to Figure 2b, the power supply circuit can also be a direct current-alternating current (DC-AC) conversion circuit to convert the DC power on the wiring into AC power before outputting it to the electrical device 200 to power the AC electrical device. Of course, the power supply circuit can also be configured as a DC-DC conversion circuit and a DC-AC conversion circuit, thereby first converting the DC power to DC power, and then converting the DC power to AC power before outputting it to the electrical device to power the AC electrical device.

[0052] In some other examples, referring to Figures 2c and 2d, which are schematic diagrams of another structure of the power supply device provided in the embodiments of this application, the input power supply can also be an alternating current (AC) power supply. The power supply device 110 can include an AC-DC conversion circuit to convert the AC power of the input power supply into DC power before outputting it to the wiring. For example, referring to Figure 2c, the power supply circuit in the power supply device 120 can be a DC-DC conversion circuit to convert the DC power on the wiring and output it to the power-consuming device 200 to power the DC power-consuming device. Of course, the power supply circuit can also be configured as a DC-AC conversion circuit and an AC-DC conversion circuit, so as to first convert the DC power to AC power, and then convert the AC power back to DC power before outputting it to the power-consuming device to power the DC power-consuming device. Alternatively, referring to Figure 2d, the power supply circuit can also be a DC-AC conversion circuit to convert the DC power on the wiring to AC power before outputting it to the power-consuming device 200 to power the AC power-consuming device. Of course, the voltage conversion circuit can also be set as a power conversion circuit and a DC-AC conversion circuit, so as to first convert DC to DC, then convert DC to AC and output it to the electrical equipment to power the AC electrical equipment.

[0053] Generally, taking DC power supply equipment as an example, there is a certain distance between the power supply equipment and the power supply itself, resulting in a certain length of wiring. The upstream power supply equipment outputs a supply voltage E to the wiring. Due to the parasitic inductance and resistance of the wiring, it is equivalent to connecting an inductor and resistor in series between the upstream power supply equipment and the power supply itself. This causes the supply voltage E to experience some loss after flowing through the wiring, resulting in the voltage at the input terminal of the power supply equipment becoming a reference voltage U0 (e.g., 48V or 60V). Furthermore, the input terminal of the power supply equipment is usually connected in parallel with an input capacitor or resistor-capacitor. Thus, the parasitic inductance and resistance of the wiring, the input capacitor or resistor-capacitor connected in parallel at the input terminal of the power supply equipment, and the power mismatch caused by changes in the power consumption equipment can lead to periodic oscillations in the input voltage of the power supply equipment, severely affecting the stability of the output voltage. This is especially true for network and computing equipment in field applications, where the distance between power supply equipment is often greater, typically exceeding 20 meters, and sometimes even reaching over 100 meters, making the periodic oscillations in the input voltage of the power supply equipment even more severe.

[0054] For example, referring to FIG3a, FIG3a is a schematic diagram of the voltage at the input terminal of the power supply device provided in the embodiment of the present application oscillating periodically. The voltage at the input terminal of the power supply device oscillates periodically around the reference voltage U0. Due to the voltage u of the input capacitor... in Similar to the voltage at the input terminal of the power supply circuit, in stage Z1, the voltage u of the input capacitor is... in If the voltage is greater than the reference voltage U0, then the voltage u in The difference between the reference voltage U0 and the oscillation difference (i.e., U) is calculated as follows: in -U0) is a positive value, and the voltage u of the input capacitor is... in First increase then decrease, oscillation difference (i.e., U) in -U0) first increases and then decreases. Furthermore, during the Z2 stage, the voltage u of the input capacitor... in If it is less than the reference voltage U0, then its oscillation difference (i.e., u) in -U0) is negative, and the voltage u of the input capacitor is... in First decrease, then increase, oscillation difference (i.e., u) in -U0) first decreases and then increases. Therefore, in practical operation, stages Z1 and Z2 alternate sequentially, causing the voltage u of the input capacitor to... in The voltage oscillation between positive and negative values ​​refers to the voltage difference at the input of the power supply device switching between positive and negative values. Understandably, in practical operation, the voltage u... in The waveform is similar to a sine wave, i.e., voltage u inThe waveform deviates from a sine wave and is not a true sine wave. Furthermore, the oscillation difference changes from positive to zero and then switches to negative, and from negative to zero and then switches to positive.

[0055] In related technologies, there are generally three methods to solve the problem of periodic voltage oscillation at the input of power supply equipment, as follows:

[0056] The first method involves adding passive components to the wiring, such as multiple inductors, resistors, and capacitors connected in series or parallel, to alter the impedance characteristics of the power supply input and suppress periodic voltage oscillations. However, this method increases the actual resistance, thereby increasing system losses and reducing conversion efficiency. Furthermore, as the power of the power supply increases, the number of capacitors required also increases, sometimes reaching hundreds, leading to a larger power supply size and hindering miniaturization requirements.

[0057] The second method involves connecting a DC-DC converter circuit in series at the input of the power supply device. This means placing a DC-DC converter between the trace and the power supply device, and using closed-loop control of the DC-DC converter circuit to suppress periodic voltage oscillations at the power supply device's input. However, in practice, this method requires the DC-DC converter circuit to convert the DC power on the trace before outputting it to the power supply device, increasing system losses and reducing conversion efficiency.

[0058] The third method involves setting up pre-feedback control in the power supply to stabilize the input voltage. However, to ensure the stability of the output voltage, post-feedback control is also needed. This creates a contradiction in the power supply's control methods, potentially leading to operational instability.

[0059] Therefore, embodiments of this application include a voltage stabilizing device in the power supply equipment to suppress periodic voltage oscillations at the input terminal of the power supply equipment, reduce system losses, and improve conversion efficiency.

[0060] Figure 4 is a schematic diagram of a power supply device provided in an embodiment of this application. Referring to Figure 4, the power supply device 120 includes not only a power supply circuit 121, but also an input capacitor CN and a voltage stabilizing device 122. The input capacitor CN is connected in parallel with the input terminal of the power supply circuit 121. The voltage stabilizing device 122 may include a power conversion circuit 1221, a storage capacitor CH, and a control circuit 1222. The input terminal of the power conversion circuit 1221 is connected in parallel with the input terminal of the power supply circuit 121, and the output terminal of the power conversion circuit 1221 is connected to the storage capacitor CH. Specifically, the first terminal of the input capacitor CN is connected to the positive input terminal of the power supply device 120, and the second terminal of the input capacitor CN is connected to the negative input terminal of the power supply device 120. Furthermore, the input terminal of the power conversion circuit 1221 has a positive input terminal VIN+ and a negative input terminal VIN-. The positive input terminal VIN+ is connected to the positive input terminal of the power supply device 120, and the negative input terminal VIN- is connected to the negative input terminal of the power supply device 120. The power conversion circuit 1221 has a positive output terminal VO+ and a negative output terminal VO-. The positive output terminal VO+ is connected to the first end of the storage capacitor CH, and the negative output terminal VO- is connected to the second end of the storage capacitor CH.

[0061] Because the input terminal of the power conversion circuit 1221 is connected in parallel with the input terminal of the power supply device 120, the voltage at the input terminal of the power conversion circuit 1221 and the voltage u of the input capacitor CN are... in And the voltage at the input terminal of the power supply device 120 is the same. Therefore, the control circuit 1222 can obtain parameter information, which includes at least the capacitor current i flowing through the input capacitor CN. c The circuit current i flowing through the input terminal of the power conversion circuit a The actual capacitance value of the input capacitor CN and the set compensation capacitor value are then used. The control circuit 1222 can then adjust the oscillation difference (i.e., u) based on this difference. in During the switching between positive and negative values ​​of -U0, the oscillation difference (i.e., u) is used. in The absolute value of -U0) (i.e., |u in The relationship between the maximum value of -U0|) and the set threshold ΔU is used to control the working state of the power conversion circuit 1221, thereby adjusting the voltage at the input terminal of the power supply circuit 121, and thus achieving the effect of suppressing the periodic oscillation of the voltage at the input terminal of the power supply device 120.

[0062] For example, referring to Figures 3b and 3c, which are schematic diagrams showing the periodic oscillation of the voltage at the input terminal of the power supply device provided in the embodiments of this application, if the oscillation difference (i.e., u) in The absolute value of -U0) (i.e., |u inIf the maximum value of -U0|) is greater than the set threshold ΔU, it indicates that the voltage at the input terminal of the power supply circuit 121 oscillates significantly. To reduce this oscillation, the control circuit 1222 can control the operation of the power conversion circuit 1221 based on the parameter information, adjusting the current i at the input terminal of the power conversion circuit 1221. a To change the voltage u of the input capacitor CN in This changes the voltage at the input terminal of the power supply circuit 121, thereby altering the oscillation difference and consequently changing the oscillation difference (i.e., u). in The absolute value of -U0) (i.e., |u in The maximum value of -U0|) can be less than or equal to the set threshold ΔU to achieve stability and suppress the periodic oscillation of the voltage at the input terminal of the power supply device 120.

[0063] Compared to the first method in related technologies, this method eliminates the need for series inductors or additional parallel capacitors and resistors at the input of the power supply device, thus achieving the effect of suppressing periodic voltage oscillations at the input of the power supply device 120. Furthermore, power conversion circuits are typically mature and highly integrated; integrating the voltage stabilizing device 122 of this application into the power supply device will not excessively increase its size. Additionally, the voltage stabilizing device 122 in this embodiment can ensure voltage stability at its input even when the input voltage of the power supply device 120 differs from that of the power-consuming device 200.

[0064] Compared to the second method in related technologies, the power conversion circuit in this application is connected in parallel with the input terminal of the power supply device. It does not require the voltage on the traces to be converted before being output to the power supply device, thus avoiding excessive losses and improving the conversion efficiency of the power supply device.

[0065] Compared to the third method in the prior art, this application does not require adding a function to control the stability of the input voltage inside the power supply device. When the power supply device controls the stability of the output voltage through feedback, the problem of unstable operation can be avoided.

[0066] Furthermore, this application incorporates a storage capacitor in the voltage stabilizing device 122, which significantly reduces the size of the power supply compared to using a battery. This is particularly beneficial for applications requiring small-sized power supplies, as it avoids excessively increasing the overall size of the power supply.

[0067] In this application, because a power conversion circuit and a storage capacitor are included, the control circuit adjusts the current i when controlling the operation of the power conversion circuit. a At that time, the current i can be controlled. aThe current flows forward into the power conversion circuit, where it can be stored in the capacitor to ensure stable operation. The control circuit adjusts the current i to control the operation of the power conversion circuit. a At the same time, the current i can also be controlled. a When the power conversion circuit flows out in the reverse direction, energy can be provided through the storage capacitor to ensure the stable operation of the power conversion circuit.

[0068] For example, if the power supply device 120 is a DC power supply device, then the power conversion circuit 1221 can be a DC-DC conversion circuit. If the power supply device 120 is an AC power supply device, then the power conversion circuit 1221 can be an AC-DC conversion circuit. The following description uses the example of the power supply device 120 being a DC power supply device and the power conversion circuit 1221 being a DC-DC conversion circuit.

[0069] Referring to Figures 3b and 3c, if the oscillation difference (i.e., u) in The absolute value of -U0) (i.e., |u in If the maximum value of -U0|) is less than or equal to the set threshold ΔU, it indicates that the voltage oscillation at the input terminal of the power supply circuit 121 is small, meeting the allowable operating range or being negligible. Based on this, the control circuit 1222 can control the power conversion circuit 1221 to stop working. At this time, no current flows through the input terminal of the power conversion circuit 1221, thus preventing the power conversion circuit 1221 from consuming the power of the power supply device 120, thereby significantly reducing power loss and improving conversion efficiency. Furthermore, when the power conversion circuit 1221 stops working, the input capacitor CN can be used to maintain the voltage stability at the input terminal of the power supply device 120.

[0070] Understandably, ΔU can be set to zero or a value greater than zero. When ΔU is set to a value greater than zero, it can bring ΔU closer to zero, thereby suppressing the periodic voltage oscillation at the input terminal of the power supply device 120. Furthermore, in practical applications, the specific value of ΔU can be determined according to the requirements of the actual application scenario, and is not limited here.

[0071] If ΔU is not equal to zero, refer to Figure 3b, the oscillation difference (i.e., u) in During the switching between positive and negative values ​​of -U0), if the periodic oscillation has a significant impact, the voltage u of the input capacitor CN will... in It has two parts: the first part is the voltage (u) in1a u in1b ) and the second part of the voltage (u) in2a u in2b ), the first part of the voltage (u) in1a u in1b The absolute value of the oscillation difference corresponding to the reference voltage U0 is less than or equal to the set threshold ΔU, and the second part of the voltage (u)in2a u in2b The absolute value of the oscillation difference corresponding to the reference voltage U0 is greater than the set threshold ΔU. Based on this, the control circuit 1222 can control the power conversion circuit 1221 to work according to the parameter information, adjust the current at the input terminal of the power conversion circuit 1221, and reduce the periodic oscillation. Then, by controlling the power conversion circuit 1221 to work, the oscillation difference (i.e., u) is reduced. in When the absolute value of -U0) gradually decreases to less than or equal to the set threshold ΔU, the control power conversion circuit 1221 stops working. At this time, the oscillation difference (i.e., u) is reduced. in -U0) continues to switch between positive and negative values, and the oscillation difference (i.e., u) in The maximum absolute value of -U0) is less than or equal to the set threshold ΔU, and the voltage u of the input capacitor CN is... in Only has the first part of the voltage (u) in1a u in1b ), and no current flows through the input terminal of the power conversion circuit 1221, reducing power consumption. Therefore, when an oscillation difference (i.e., u) occurs... in When the maximum absolute value of -U0) is greater than the set threshold ΔU, the current waveform at the input of the power conversion circuit 1221 is continuous.

[0072] For example, when the oscillation is large, the oscillation difference (i.e., u) in During the same period when -U0) is positive, the voltage u of the input capacitor CN is... in It has two parts: the first part is the voltage u in1a Second part voltage u in2a The first part is the voltage u. in1a The absolute value of the oscillation difference corresponding to the reference voltage U0 is less than or equal to the set threshold ΔU, and the second part voltage u in2a The absolute value of the oscillation difference corresponding to the reference voltage U0 is greater than the set threshold ΔU. Then, when the oscillation is small, the voltage u across the input capacitor CN... in Only has the first part of voltage u in1a And, when the oscillation is large, at the oscillation difference (i.e., u) in During the same period when -U0) is negative, the voltage u of the input capacitor CN is... in It also has two parts: the first part is the voltage u in1b Second part voltage u in2b The first part is the voltage u. in1b The absolute value of the oscillation difference corresponding to the reference voltage U0 is less than or equal to the set threshold ΔU (i.e., u in1b -U0≥-ΔU), the second part of the voltage u in2b The absolute value of the oscillation difference corresponding to the reference voltage U0 is greater than the set threshold ΔU (i.e., uin2b -U0<-ΔU). Then, when the oscillation is small, the voltage u across the input capacitor CN... in Only has the first part of voltage u in2a .

[0073] If ΔU equals zero, refer to Figure 3c, the oscillation difference (i.e., u) in During the switching between positive and negative values ​​of -U0), if the periodic oscillation has a significant impact, the voltage u of the input capacitor CN will... in It also has two parts: a first part voltage and a second part voltage (u). in2a u in2b The first part of the voltage is equal to the reference voltage U0, while the second part of the voltage is not equal to the reference voltage U0. Based on this, the control circuit 1222 can control the power conversion circuit 1221 to operate according to the parameter information, adjusting the current at the input terminal of the power conversion circuit 1221 to reduce periodic oscillations. Then, by controlling the operation of the power conversion circuit 1221, the oscillation difference (i.e., u0) is reduced. in When the absolute value of -U0 gradually decreases to zero, the power conversion circuit 1221 stops working, and no current flows through the input terminal of the power conversion circuit 1221, thus reducing power consumption. Therefore, when an oscillation difference (i.e., u0) occurs... in When the maximum absolute value of -U0) is greater than the set threshold ΔU, the current waveform at the input terminal of the power conversion circuit 1221 is also continuous.

[0074] For example, in the oscillation difference (i.e., u) in During the same period when -U0) is positive, the voltage u of the input capacitor CN is... in It has two parts: a first part voltage and a second part voltage u. in2a The first voltage component is equal to the reference voltage U0, and the second voltage component is greater than the reference voltage U0. Also, the voltage difference in oscillation (i.e., u...) in During the same period when -U0) is negative, the voltage u of the input capacitor CN is... in It also has two parts: a first part voltage and a second part voltage u. in2b The first part of the voltage is equal to the reference voltage U0, and the second part of the voltage is less than the reference voltage U0.

[0075] It is worth mentioning that the voltage stabilizing device 122 in this application embodiment can be applied to power supply devices 100 with different U0 values. That is, no matter what the reference voltage U0 is at the input terminal of the power supply device 120, the voltage stabilizing device 122 in this application embodiment can automatically obtain the reference voltage U0. Based on this, it can automatically adjust U0 in the reference voltage threshold range [U0-ΔU1, U0+ΔU2] to suppress the periodic oscillation of the voltage at the input terminal of the power supply device 120.

[0076] Exemplary examples show that the control circuitry can be a field-programmable gate array (FPGA), a general-purpose central processing unit (CPU), a general-purpose processor, a digital signal processing unit (DSP), an application-specific integrated circuit (ASIC), or other programmable logic devices, transistor logic devices, hardware components, or any combination thereof. It can implement or execute the various exemplary logic blocks, modules, and circuits described in conjunction with the disclosure of this application. The aforementioned control circuitry can also be a combination that implements computational functions, such as including one or more microprocessor combinations, a combination of a DSP and a microprocessor, etc.

[0077] In the voltage stabilizing device 122 of this application embodiment, the power conversion circuit 1221 can be configured as a boost circuit, a buck circuit, a buck-boost circuit, an LLC circuit, or a dual active full-bridge circuit. This configuration allows for a power conversion circuit 1221 with a simple structure. Furthermore, in practical applications, the topologies of boost circuits, buck circuits, LLC circuits, buck-boost circuits, or dual active full-bridge circuits are relatively mature, making the implementation of the power conversion circuit 1221 relatively simple, thereby reducing design difficulty and production costs. Additionally, it can supplement more electrical energy in the event of changes in the supply voltage E or sudden loading of the electrical equipment 200, preventing power loss at the input and output of the power supply device 120. It is worth noting that the above are merely illustrative examples of the specific topology of the power conversion circuit 1221. In specific implementations, the specific topology of the power conversion circuit 1221 is not limited to the topology provided in this application embodiment, but can also be other topologies known to those skilled in the art, which are not limited here.

[0078] In some embodiments, the boost circuit has various topologies, and this application does not limit the specific form of the boost circuit topology. The topology of the boost circuit is illustrated below. For example, referring to FIG5a, FIG5a is a schematic diagram of a circuit structure of a boost circuit provided in an embodiment of this application. The power conversion circuit 1221 is configured as a boost circuit 311. The boost circuit 311 includes an inductor L1, switches S11 and S12. The first end of the inductor L1 is connected to the positive input terminal VIN+ of the power conversion circuit 1221. The second end of the inductor L1 is connected to the second end of the switch S11 and the second end of the switch S12, respectively. The first end of the switch S11 is connected to the positive output terminal VO+ of the power conversion circuit 1221, and the first end of the switch S12 is connected to the negative output terminal VO- of the power conversion circuit 1221.

[0079] In some embodiments, the buck circuit also has various topologies, and this application does not limit the specific form of the buck circuit topology. The topology of the buck circuit is illustrated below. For example, referring to FIG5b, FIG5b is a schematic diagram of a circuit structure of a buck circuit provided in an embodiment of this application. The power conversion circuit 1221 is configured as a buck circuit 312. The buck circuit 312 includes an inductor L2, switches S21 and S22. The first terminal of switch S21 is connected to the positive input terminal VIN+ of the power conversion circuit 1221, and the first terminal of switch S22 is connected to the negative input terminal VIN- of the power conversion circuit 1221. The first terminal of inductor L2 is connected to the second terminal of switch S21 and the second terminal of switch S22, respectively. The second terminal of inductor L2 is connected to the positive output terminal VO+ of the power conversion circuit 1221, and the first terminal of switch S22 is also connected to the negative output terminal VO- of the power conversion circuit 1221.

[0080] In some embodiments, the buck-boost circuit also has various topologies, and this application does not limit the specific form of the buck-boost circuit topology. The topology of the buck-boost circuit is illustrated below. For example, referring to FIG5c, FIG5c is a schematic diagram of a circuit structure of a buck-boost circuit provided in an embodiment of this application. The power conversion circuit 1221 is configured as a buck-boost circuit 313. The buck-boost circuit 313 includes an inductor L3, switches S31 and S32. The first terminal of switch S31 is connected to the negative input terminal VIN- of the power conversion circuit 1221, the first terminal of switch S32 is connected to the positive output terminal VO+ of the power conversion circuit 1221, the first terminal of inductor L3 is connected to the second terminal of switch S31 and the second terminal of switch S32, and the second terminal of inductor L3 is connected to the positive input terminal VIN+ and the negative output terminal VO- of the power conversion circuit 1221, respectively. Alternatively, referring to Figure 5d, which is a schematic diagram of another circuit structure of the buck-boost circuit provided in the embodiment of this application, the power conversion circuit 1221 is configured as a buck-boost circuit 314. The buck-boost circuit 314 includes an inductor L4 and switches S41, S42, S43, and S44. The first end of switch S41 is connected to the positive input terminal VIN+ of the power conversion circuit 1221, the first end of switch S42 is connected to the negative input terminal VIN- of the power conversion circuit 1221, the first end of inductor L4 is connected to the second end of switch S41 and the second end of switch S42, the second end of inductor L4 is connected to the second end of switch S43 and the second end of switch S43, the first end of switch S43 is connected to the positive output terminal VO+ of the power conversion circuit 1221, and the first end of switch S44 is connected to the negative output terminal VO- of the power conversion circuit 1221.

[0081] In some embodiments, the dual active full-bridge circuit also has various topologies, and this application does not limit the specific form of the dual active full-bridge circuit topology. The topology of the dual active full-bridge circuit is illustrated below. For example, referring to Figure 5e, which is a schematic diagram of a circuit structure of a dual active full-bridge circuit provided in an embodiment of this application, the power conversion circuit 1221 is configured as a dual active full-bridge circuit 315. The dual active full-bridge circuit 315 includes switches S51, S52, S53, S54, S55, S56, S57, and S58, capacitor C0, inductor L5, and transformer T. The first terminals of switches S51 and S53 are connected to the positive input terminal VIN+ of the power conversion circuit 1221, the first terminals of switches S52 and S54 are connected to the negative input terminal VIN- of the power conversion circuit 1221, the second terminals of switches S51 and S53 are connected to the first terminal of capacitor C0, the second terminal of capacitor C0 is connected to the first terminal of inductor L5, the second terminal of inductor L5 is connected to the first terminal of the primary winding of transformer T, and the second terminals of switches S53 and S54 are connected to the second terminal of the primary winding of transformer T. The first terminals of switches S55 and S57 are both connected to the positive output terminal VO+ of the power conversion circuit 1221. The first terminals of switches S56 and S58 are both connected to the negative output terminal VO- of the power conversion circuit 1221. The second terminals of switches S55 and S57 are both connected to the first terminals of the primary and secondary windings of the transformer T. The second terminals of switches S57 and S58 are both connected to the second terminals of the primary and secondary windings of the transformer T.

[0082] In some embodiments, the LLC circuit also has various topologies, and this application does not limit the specific form of the LLC circuit topology. The topology of the dual active full-bridge circuit is illustrated below. For example, referring to Figure 5f, which is a schematic diagram of a circuit structure of an LLC circuit provided in an embodiment of this application, the power conversion circuit 1221 is configured as an LLC circuit 316. The LLC circuit 316 includes switches S61, S62, S63, and S64, diodes D1, D2, D3, and D4, inductors Lr and Lm, capacitor Cr, and transformer T. The first terminals of switches S61 and S63 are connected to the positive input terminal VIN+ of the power conversion circuit 1221, the first terminals of switches S62 and S64 are connected to the negative input terminal VIN- of the power conversion circuit 1221, the second terminals of switches S61 and S63 are connected to the first terminal of inductor Lr, the second terminal of inductor Lr is connected to the first terminal of the primary winding of transformer T, the second terminals of switches S63 and S64 are connected to the first terminal of capacitor Cr, and the second terminal of capacitor Cr is connected to the second terminal of the primary winding of transformer T. The first terminal of inductor Lm is connected to the first terminal of the primary winding of transformer T, and the second terminal of inductor Lm is connected to the second terminal of the primary winding of transformer T. The cathodes of diodes D1 and D3 are both connected to the positive output terminal VO+ of power conversion circuit 1221, the anodes of diodes D2 and D4 are both connected to the negative output terminal VO- of power conversion circuit 1221, the anodes of diodes D1 and D2 are both connected to the first terminals of the primary and secondary windings of transformer T, and the anodes of diodes D3 and D4 are both connected to the second terminals of the primary and secondary windings of transformer T.

[0083] Since the power conversion circuit 1221 charges or discharges the storage capacitor CH during operation, in order to avoid overvoltage or undervoltage of the storage capacitor CH and maintain the stability of the voltage across the storage capacitor CH, the control circuit 1222 can adjust the circuit current i at the input terminal of the power conversion circuit 1221 according to the parameter information. a The magnitude and direction. For example, a current sampling unit can be provided in the voltage stabilizing device 122 to collect the capacitive current i of the input capacitor CN. c and circuit current i a Capacitor current i c and circuit current i a The signal is sent to the control circuit 1222, which can adjust the signal based on the capacitor current i. c and circuit current i aThe current sampling unit determines the magnitude and direction of the current at the input terminal of the power conversion circuit 1221 to be controlled, thereby controlling the current at the input terminal of the power conversion circuit 1221 to adjust according to the determined magnitude and direction. Furthermore, the current sampling unit can be integrated with the control circuit and mounted on the circuit board, or it can be mounted separately in different areas of the circuit board.

[0084] Understandably, the storage capacitor CH can be set as a high-voltage capacitor, thereby increasing the energy in the power conversion circuit 1221, significantly reducing the number of capacitors, and lowering cost and size.

[0085] In practical implementation, the control circuit 1222 can output a drive signal to the power conversion circuit 1221. This drive signal controls the on / off state of the switches in the power conversion circuit 1221 (e.g., switches S11-S12 in a boost circuit, switches S21-S22 in a buck circuit, switches S31, S32, or S41-S44 in a buck-boost circuit, or switches S51-S58 in a dual active full-bridge circuit), thereby adjusting the circuit current i at the input terminal of the power conversion circuit 1221. a The direction and magnitude of the current at the input of the power conversion circuit 1221 are determined by the power conversion circuit 1221. The drive signal is a PWM signal with a duty cycle. Therefore, the on / off state of the switch in the power conversion circuit 1221 can be adjusted by changing the duty cycle, thereby adjusting the direction and magnitude of the current at the input of the power conversion circuit 1221. Based on this, the control circuit 1222 can determine the duty cycle of the drive signal according to the parameter information. Furthermore, the control circuit 1222 can also control the switch in the power conversion circuit 1221 to achieve soft switching, thereby reducing switching losses and improving the conversion efficiency of the power conversion circuit 1221.

[0086] In some examples, the parameter information can include the capacitor current i. c and circuit current i a Based on this, the control circuit 1222 can adjust the capacitor current i c The actual capacitance value c of the input capacitor CN cn And setting the compensation capacitor value c f Determine the target current i a_ref Target current i a_ref It has magnitude and direction. Then, based on the target current i... a_ref and circuit current i a The difference between them (i.e., i) a_ref -i a The duty cycle of the drive signal is determined by i. For example, it can be determined based on i. c / c cn =i a_ref / c fThe actual capacitance value c of the input capacitor CN cn and setting the compensation capacitor value c f The value of the compensation capacitor, c, can be stored in the control circuit 1222. f The capacitive reactance value required for the power conversion circuit 1221 is specified, and the compensation capacitor value can be obtained using algorithms from related technologies. Furthermore, the difference (i.e., i...) a -i a_ref You can input the PID controller (Proportional-Integral-Derivative controller) to get the duty cycle.

[0087] In some other examples, the parameter information includes not only the capacitor current i c and circuit current i a It also includes the voltage u of the input capacitor CN. in and the voltage u of the storage capacitor CH ch For example, a voltage sampling unit can be provided in the voltage stabilizing device 122 to collect the voltage u of the input capacitor CN. in and the voltage u of the storage capacitor CH ch Voltage u in and voltage u ch The signal is sent to the control circuit 1222. Further, the voltage sampling unit can be integrated with the control circuit and mounted on the circuit board, or it can be separately mounted in different areas of the circuit board. Based on this, the control circuit 1222 can determine the voltage based on the capacitor current i. c The actual capacitance value c of the input capacitor CN cn And setting the compensation capacitor value c f Determine the target current i a_ref Target current i a_ref It has magnitude and direction. Based on the target current i a_ref and circuit current i a The difference between them (i.e., i) a_ref -i a Determine the target voltage U. L Then, based on the target voltage U L The voltage u of the input capacitor CN in and the voltage u of the storage capacitor ch The duty cycle of the drive signal is determined. For example, it can be determined based on i. c / c cn =i a_ref / c f The actual capacitance value c of the input capacitor CN cn and setting the compensation capacitor value c fThe value of the compensation capacitor, c, can be stored in the control circuit 1222. f The inductive reactance value to be provided for the power conversion circuit 1221. Furthermore, the difference (i.e., i...) a -i a_ref The input can be used to a PID controller (Proportional-Integral-Derivative controller) to obtain the target voltage U. L Target voltage U L The voltage u of the input capacitor CN in and the voltage u of the storage capacitor ch The duty cycle is obtained after inputting the feedforward controller.

[0088] For example, for some topologies of the power conversion circuit 1221, if the difference i a_ref -i a If the value is positive, the duty cycle increases. If the difference i a_ref -i a If the value is negative, the duty cycle decreases. Based on this, the topology of this part of the power conversion circuit 1221 can be controlled to output a new drive signal. For some other topologies of the power conversion circuit 1221, if the difference i a_ref -i a If the difference is negative, the duty cycle increases. If the difference i a_ref -i a If the value is positive, the duty cycle decreases. Based on this, the topology of this power conversion circuit 1221 can be controlled to output a new drive signal.

[0089] Due to the oscillation difference (i.e., u) in The absolute value of -U0) (i.e., |u in When the maximum value of -U0|) is greater than the set threshold ΔU, there are two possibilities: the oscillation difference (i.e., u) is greater than the set threshold ΔU. in -U0) is positive and the oscillation difference (i.e., u) is positive. in -U0)>ΔU, and the oscillation difference (i.e., u) in -U0) is negative and the oscillation difference (i.e., u) is negative. in The following explains the two cases where -U0) < ΔU.

[0090] First scenario: Referring to Figures 3b, 3c, and 4, if the oscillation difference (i.e., U) in -U0) is positive and the oscillation difference (i.e., u) is positive. in -U0)>ΔU, capacitor current i cThe current flows from the first terminal of the input capacitor CN to the second terminal. Based on the acquired parameter information and the working process described above, the control circuit 1222 outputs a drive signal to the power conversion circuit 1221, controlling the power conversion circuit 1221 to operate and causing the current i at the input terminal of the power conversion circuit 1221 to... a The input flows into the power conversion circuit 1221, causing the oscillation difference (i.e., U) to... in -U0) is reduced, thereby achieving stability and suppressing the periodic voltage oscillation at the input terminal of the power supply device 120. Furthermore, the current i at the input terminal of the power conversion circuit 1221... a During the process of the power conversion circuit 1221 flowing into the power conversion circuit, for example in stage Z1, the power conversion circuit 1221 is controlled to operate by the control circuit 1222, which can also control the current i flowing into the input terminal of the power conversion circuit 1221. a The magnitude of the current i first increases and then decreases. This allows the current i flowing into the input terminal of the power conversion circuit 1221 to increase. a The magnitude follows the voltage u in The change is adjusted to increase the voltage u. in Stabilization effect. It is worth mentioning that the current i greater than 0 in Figures 3a and 3b... a This represents the current flowing into the input terminal of the power conversion circuit 1221.

[0091] Furthermore, in order to further increase the voltage u in Stabilization effect, refer to Figures 3b and 3c, at the oscillation difference (i.e., U) in In multiple consecutive different stages where -U0) is positive, the maximum value of the current flowing into the input terminal of the power conversion circuit 1221 decreases sequentially. For example, referring to Figure 3b, i ma1 i ma2 i ma3 i ma4 i ma5 i ma6 i ma7 i ma8 i ma9 These represent the maximum values ​​of the current flowing into the input terminal of the power conversion circuit 1221 during multiple consecutive different stages, which can make i ma1 i ma2 i ma3 i ma4 i ma5 i ma6 i ma7 i ma8 i ma9 Decrease sequentially. For example, referring to Figure 3c, i ma1 i ma2 i ma3 ima4 i ma5 i ma6 i ma7 i ma8 i ma9 i ma10 i ma11 These represent the maximum values ​​of the current flowing into the input terminal of the power conversion circuit 1221 during multiple consecutive different stages, which can make i ma1 i ma2 i ma3 i ma4 i ma5 i ma6 i ma7 i ma8 i ma9 i ma10 i ma11 Decrease sequentially. Furthermore, this can be achieved by adjusting the oscillation difference (i.e., U). in During several consecutive different stages when -U0) is positive, the maximum value of the current flowing into the input terminal of the power conversion circuit 1221 is successively reduced by the same or different values.

[0092] The second scenario: Referring to Figure 6, which is another structural schematic diagram of the voltage stabilizing device 122 provided in the embodiments of this application. Combining Figures 3b, 3c, and 6, if the oscillation difference (i.e., U...) in -U0) is negative and the oscillation difference (i.e., u) is negative. in -U0)<-ΔU, capacitor current i c The current flows from the second terminal of the input capacitor CN to the first terminal. The control circuit 1222, based on the parameter information and the working process described above, outputs a drive signal to the power conversion circuit 1221, controlling the power conversion circuit 1221 to operate, thereby increasing the current i at the input terminal of the power conversion circuit 1221. a The power conversion circuit 1221 flows out to make the oscillation difference (i.e., U) in The absolute value of -U0) decreases, thereby achieving stability and suppressing the periodic voltage oscillation at the input terminal of the power supply device 120. Furthermore, the current i at the input terminal of the power conversion circuit 1221... a During the process of power conversion circuit 1221 flowing out, for example in stage Z2, the power conversion circuit 1221 is controlled to work by control circuit 1222, which can also cause the current i flowing out of the input terminal of power conversion circuit 1221 to be... a The magnitude of the current first increases and then decreases. This allows the current i flowing out of the input terminal of the power conversion circuit 1221 to increase. a The magnitude follows the voltage u in The change is adjusted to increase the voltage u. inStabilization effect. It is worth mentioning that the currents i less than 0 in Figures 3a and 3b... a This represents the current flowing out of the input terminal of the power conversion circuit 1221.

[0093] Furthermore, in order to further increase the voltage u in Stabilization effect, refer to Figures 3b and 3c, at the oscillation difference (i.e., U) in During several consecutive stages where -U0) is negative, the maximum value of the current flowing out of the input terminal of the power conversion circuit 1221 decreases sequentially. For example, referring to Figure 3b, i mi1 i mi2 i mi3 i mi4 i mi5 i mi6 i mi7 i mi8 i mi9 These represent the maximum values ​​of the current flowing out of the input terminal of the power conversion circuit 1221 during multiple consecutive different stages, which can make i mi1 i mi2 i mi3 i mi4 i mi5 i mi6 i mi7 i mi8 i mi9 Decrease sequentially. For example, referring to Figure 3c, i mi1 i mi2 i mi3 i mi4 i mi5 i mi6 i mi7 i mi8 i mi9 i mi10 i mi11 These represent the maximum values ​​of the current flowing out of the input terminal of the power conversion circuit 1221 during multiple consecutive different stages, which can make i mi1 i mi2 i mi3 i mi4 i mi5 i mi6 i mi7 i m8 i mi9 i mi10 i mi11 Decrease sequentially. Furthermore, this can be achieved by adjusting the oscillation difference (i.e., U). in In multiple consecutive stages where -U0) is negative, the maximum value of the current at the input terminal of the power conversion circuit 1221 is successively reduced by the same or different values.

[0094] This application also provides a voltage control method applied to a power supply device. The power supply device includes a power supply circuit, an input capacitor, and a voltage stabilizing device. The input terminal of the power supply circuit is used to receive an input voltage, and the output terminal of the power supply circuit is used to connect to the electrical device. The power supply circuit converts the input voltage and outputs it to the electrical device. The input capacitor is connected in parallel with the input terminal of the power supply circuit. The voltage stabilizing device includes a power conversion circuit and a storage capacitor. The input terminal of the power conversion circuit is connected in parallel with the input terminal of the power supply circuit, and the output terminal of the power conversion circuit is connected to the storage capacitor. Furthermore, the method includes: responding to the switching between positive and negative values ​​of the oscillation difference, where the maximum absolute value of the oscillation difference exceeds a set threshold, controlling the power conversion circuit to operate according to parameter information, adjusting the current flowing through the input terminal of the power conversion circuit, so that the absolute value of the oscillation difference of the input capacitor voltage is less than or equal to the set threshold; wherein, the parameter information includes at least the capacitor current flowing through the input capacitor, the circuit current flowing through the input terminal of the power conversion circuit, the actual capacitance value of the input capacitor, and the set compensation capacitor value; the oscillation difference is the difference between the voltage of the input capacitor and the reference voltage at the input terminal of the power supply circuit, and in the same stage where the oscillation difference is positive, the voltage of the input capacitor first increases and then decreases, and in the same stage where the oscillation difference is negative, the voltage of the input capacitor first decreases and then increases.

[0095] The above description is only a specific implementation of this application, but the protection scope of this application is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the protection scope of this application.

Claims

1. A power supply device, characterized in that, Includes power supply circuit, input capacitor, and voltage stabilization device; The input terminal of the power supply circuit is used to receive the input voltage, the output terminal of the power supply circuit is used to connect to the electrical equipment, and the power supply circuit is used to convert the input voltage and output it to the electrical equipment. The input capacitor is connected in parallel with the input terminal of the power supply circuit; The voltage stabilization device includes: a power conversion circuit, a storage capacitor, and a control circuit. The input terminal of the power conversion circuit is connected in parallel with the input terminal of the power supply circuit, and the output terminal of the power conversion circuit is connected to the storage capacitor. The control circuit is used for: In response to the switching between positive and negative values ​​of the oscillation difference, if the maximum absolute value of the oscillation difference exceeds a set threshold, the power conversion circuit is controlled to operate according to parameter information. The current flowing through the input terminal of the power conversion circuit is adjusted so that the absolute value of the oscillation difference of the input capacitor voltage is less than or equal to the set threshold. The parameter information includes at least the capacitor current flowing through the input capacitor, the circuit current flowing through the input terminal of the power conversion circuit, the actual capacitance value of the input capacitor, and a set compensation capacitor value. The oscillation difference is the voltage of the input capacitor minus the reference voltage at the input terminal of the power supply circuit. During the same phase when the oscillation difference is positive, the voltage of the input capacitor first increases and then decreases; during the same phase when the oscillation difference is negative, the voltage of the input capacitor first decreases and then increases.

2. The power supply device as described in claim 1, characterized in that, The control circuit is further used for: In response to the oscillation difference being positive and the maximum value of the oscillation difference being greater than the set threshold, the power conversion circuit is controlled to operate according to the parameter information, so that the current at the input terminal of the power conversion circuit flows into the power conversion circuit.

3. The power supply device as described in claim 2, characterized in that, During the process of current flowing into the input terminal of the power conversion circuit, the magnitude of the current flowing into the input terminal of the power conversion circuit first increases and then decreases.

4. The power supply device as described in claim 3, characterized in that, In several consecutive different stages where the oscillation difference is positive, the maximum value of the oscillation difference decreases sequentially, and the maximum value of the current flowing into the input terminal of the power conversion circuit decreases sequentially.

5. The power supply device according to any one of claims 1-4, characterized in that, The control circuit is further used for: In response to the oscillation difference being negative and the maximum absolute value of the oscillation difference being greater than the set threshold, the power conversion circuit is controlled to operate according to the parameter information, so that the current at the input terminal of the power conversion circuit flows out of the power conversion circuit.

6. The power supply device as described in claim 5, characterized in that, During the process of current flowing out of the power conversion circuit from its input terminal, the magnitude of the current flowing out of the input terminal first increases and then decreases.

7. The power supply device as described in claim 6, characterized in that, In several consecutive different stages where the oscillation difference is negative, the maximum value of the absolute value of the oscillation difference decreases sequentially, and the maximum value of the current flowing out of the input terminal of the power conversion circuit decreases sequentially.

8. The power supply device according to any one of claims 1-7, characterized in that, The control of the power conversion circuit includes: A drive signal is output to the power conversion circuit; wherein the duty cycle of the drive signal is determined according to the parameter information.

9. The power supply device as described in claim 8, characterized in that, The control circuit is further used for: The target current is determined based on the capacitor current, the actual capacitance value, and the set compensation capacitance value; The duty cycle of the drive signal is determined based on the difference between the target current and the circuit current.

10. The power supply device as claimed in claim 8, characterized in that, The parameter information also includes: the voltage of the input capacitor and the voltage of the storage capacitor; The control circuit is further used for: The target current is determined based on the capacitor current, the actual capacitance value, and the set compensation capacitance value; The target voltage is determined based on the difference between the target current and the circuit current; The duty cycle of the drive signal is determined based on the target voltage, the voltage of the input capacitor, and the voltage of the storage capacitor.

11. The power supply device according to any one of claims 1-10, characterized in that, The control circuit is also used for: In response to the maximum value of the absolute value of the oscillation difference being less than or equal to a set threshold, the power conversion circuit is controlled to stop working.

12. A power supply device, characterized in that, include: One or more power supply devices as described in any one of claims 1-11.

13. A communication device, characterized in that, It includes electrical equipment and a power supply device as described in claim 12, wherein the output terminal of the power supply device is connected to the electrical equipment.

14. A voltage stabilization control method, characterized in that, This invention is applied to power supply equipment, which includes a power supply circuit, an input capacitor, and a voltage stabilizing device. The input terminal of the power supply circuit is used to receive an input voltage, and the output terminal of the power supply circuit is used to connect to the electrical equipment. The power supply circuit converts the input voltage and outputs it to the electrical equipment. The input capacitor is connected in parallel with the input terminal of the power supply circuit. The voltage stabilizing device includes a power conversion circuit and a storage capacitor. The input terminal of the power conversion circuit is connected in parallel with the input terminal of the power supply circuit, and the output terminal of the power conversion circuit is connected to the storage capacitor. The method includes: In response to the switching between positive and negative values ​​of the oscillation difference, if the maximum absolute value of the oscillation difference exceeds a set threshold, the power conversion circuit is controlled to operate according to parameter information. The current flowing through the input terminal of the power conversion circuit is adjusted so that the absolute value of the oscillation difference of the input capacitor voltage is less than or equal to the set threshold. The parameter information includes at least the capacitor current flowing through the input capacitor, the circuit current flowing through the input terminal of the power conversion circuit, the actual capacitance value of the input capacitor, and a set compensation capacitor value. The oscillation difference is the voltage of the input capacitor minus the reference voltage at the input terminal of the power supply circuit. During the same phase when the oscillation difference is positive, the voltage of the input capacitor first increases and then decreases; during the same phase when the oscillation difference is negative, the voltage of the input capacitor first decreases and then increases.

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