Voltage control method, power stabilization apparatus, and device

Abstract

The present application discloses a voltage control method, a power stabilization apparatus, and a device, for use in mitigating periodic voltage oscillations of input ends of power supply devices. The voltage control method is applied to a power stabilization device. The power stabilization device comprises a bidirectional conversion circuit, an energy storage component, and a control circuit; an input end of the bidirectional conversion circuit is used for being connected in parallel to an input end of a power supply device; and an output end of the bidirectional conversion circuit is connected to the energy storage component. The voltage control method specifically comprises: in response to an oscillation difference of the voltage of the input end of the bidirectional conversion circuit switching between a positive value and a negative value, and the voltage of the input end of the bidirectional conversion circuit being not within a reference voltage threshold interval, the control circuit controls, on the basis of control parameters, the bidirectional conversion circuit to work to adjust the current of the input end of the bidirectional conversion circuit, so as to change the voltage of the input end of the bidirectional conversion circuit, thereby achieving the purpose of stabilization, and suppressing periodic voltage oscillations.

Description

Voltage control method, power supply stabilizing device and equipment TECHNICAL FIELD

[0001] The present application relates to the technical field of voltage stabilization, and particularly relates to a voltage control method, a power supply stabilizing device and equipment. BACKGROUND

[0002] A power supply device is a device that converts input voltage and outputs the converted voltage to an electrical equipment to supply power to the electrical equipment. Generally, the input end of the power supply device is connected to the output end of a previous power supply device through a wire, and the previous power supply device provides voltage for the power supply device. Since the wire has parasitic inductance and parasitic resistance, it is equivalent to connecting an inductance and a resistance in series between the previous power supply device and the power supply device. In addition, the input end of the power supply device is usually connected in parallel with an input capacitor or a blocking capacitor. When any two or all of the parasitic inductance and parasitic resistance on the wire, the input capacitor or the blocking capacitor connected in parallel with the input end of the power supply device, and the power size caused by the change of the electrical equipment do not match, the voltage at the input end of the power supply device will periodically oscillate.

[0003] SUMMARY

[0004] The present application provides a voltage control method, a power supply stabilizing device and equipment to improve the phenomenon of periodic oscillation of the voltage at the input end of the power supply device.

[0005] In a first aspect, an embodiment of the present application provides a voltage control method, which is applied to a power supply stabilizing device. The power supply stabilizing device comprises a bidirectional conversion circuit, a control circuit and an energy storage component. An input end of the bidirectional conversion circuit is connected in parallel with an input end of a power supply device, and an output end of the bidirectional conversion circuit is connected with the energy storage component. Since the input end of the bidirectional conversion circuit is connected in parallel with the input end of the power supply device, the voltage at the input end of the bidirectional conversion circuit is the same as the voltage at the input end of the power supply device, so that a control parameter can be obtained, which at least comprises the voltage and the current at the input end of the bidirectional conversion circuit. Moreover, when the power supply device is working, the power supply device in the front stage will input a reference voltage to the input end of the power supply device, and the power supply device will further output the input reference voltage after voltage conversion. In the present application, the difference between the voltage at the input end of the bidirectional conversion circuit and the reference voltage is taken as an oscillation difference, which will switch between positive and negative values. Based on this, the voltage control method can comprise the following process: in response to the oscillation difference switching between positive and negative values and the voltage at the input end of the bidirectional conversion circuit not being located in a reference voltage threshold interval, the control circuit controls the bidirectional conversion circuit to work based on the control parameter, adjusts the current at the input end of the bidirectional conversion circuit, changes the voltage at the input end of the bidirectional conversion circuit, and gradually reduces the oscillation difference of the periodic oscillation of the voltage at the input end of the bidirectional conversion circuit, so that the voltage at the input end of the bidirectional conversion circuit is located in the reference voltage threshold interval, the purpose of stabilization is achieved, and the effect of suppressing the periodic oscillation of the voltage at the input end of the power supply device is realized.

[0006] Since the bidirectional conversion circuit and the energy storage component are arranged, when the voltage control method of the present application controls the bidirectional conversion circuit to work to adjust the current i in , the current i in can flow into the bidirectional conversion circuit in the forward direction, at this time, the energy storage component can carry energy, and the working stability of the bidirectional conversion circuit can be ensured. In addition, when the voltage control method of the present application controls the bidirectional conversion circuit to work to adjust the current i in , the current i in can flow out of the bidirectional conversion circuit in the reverse direction, at this time, the energy storage component can provide energy, and the working stability of the bidirectional conversion circuit can be ensured.

[0007] Moreover, the voltage control method in the embodiment of the present application does not need to connect an inductor in series or connect an additional capacitor resistor in parallel at the input end of the power supply device, and the effect of suppressing the periodic oscillation of the voltage at the input end of the power supply device can be realized. In addition, when the input voltage of the power supply device is different and the power consumption device is different, the power supply stabilizing device in the embodiment of the present application can also ensure the voltage stability at the input end thereof.

[0008] And, the bidirectional conversion circuit in the application is connected in parallel with the input end of the power supply device, and the voltage on the wire does not need to be converted and output to the power supply device, so that excessive loss can be avoided, and the conversion efficiency of the power supply device is improved.

[0009] In addition, by implementing the voltage control method in the application, the function of stabilizing the input end voltage of the power supply device does not need to be added inside the power supply device, and when the power supply device stabilizes the output end voltage through feedback control, the problem of unstable operation can be avoided.

[0010] In some embodiments, for the case that the oscillation difference switches between positive and negative values and the voltage at the input end of the bidirectional conversion circuit is not in the reference voltage threshold interval, the control circuit controls the operation of the bidirectional conversion circuit based on the control parameter to adjust the current at the input end of the bidirectional conversion circuit, which can include the following process: in response to the oscillation difference being positive and the voltage at the input end of the bidirectional conversion circuit being greater than the upper limit of the reference voltage threshold interval, the control circuit controls the operation of the bidirectional conversion circuit based on the control parameter to make the current at the input end of the bidirectional conversion circuit flow into the bidirectional conversion circuit in a positive direction, so that the absolute value of the oscillation difference gradually decreases, thereby achieving the purpose of stabilization and realizing the effect of suppressing the periodic oscillation of the voltage at the input end of the power supply device.

[0011] In some embodiments, in the same stage where the oscillation difference is positive, the oscillation difference first increases and then decreases. And, in the process of making the current at the input end of the bidirectional conversion circuit flow into the bidirectional conversion circuit in a positive direction, the control of the operation of the bidirectional conversion circuit can also make the size of the current flowing into the input end of the bidirectional conversion circuit first increase and then decrease. In this way, the size of the current flowing into the input end of the bidirectional conversion circuit can change following the change of the oscillation difference, and the voltage stabilization effect at the input end of the bidirectional conversion circuit is improved.

[0012] In some embodiments, in a plurality of different stages where the oscillation difference is positive, the maximum value of the oscillation difference can be sequentially decreased, and the maximum value of the size of the current flowing into the input end of the bidirectional conversion circuit can also be sequentially decreased, further improving the voltage stabilization effect at the input end of the bidirectional conversion circuit. Further, in a plurality of different stages where the oscillation difference is positive, the maximum value of the size of the current flowing into the input end of the bidirectional conversion circuit can be sequentially decreased by the same or different values.

[0013] In some embodiments, for the case that the oscillation difference value switches between positive and negative values and the voltage at the input terminal of the bidirectional conversion circuit does not lie in the reference voltage threshold interval, the control circuit controls the operation of the bidirectional conversion circuit based on the control parameter to adjust the current at the input terminal of the bidirectional conversion circuit, which can include the following process: in response to the oscillation difference value being negative and the voltage at the input terminal of the bidirectional conversion circuit being less than the lower limit of the reference voltage threshold interval, the control circuit controls the operation of the bidirectional conversion circuit based on the control parameter to make the current at the input terminal of the bidirectional conversion circuit flow reversely out of the input terminal of the bidirectional conversion circuit, so as to gradually reduce the absolute value of the oscillation difference value, thereby achieving the purpose of stabilization and realizing the effect of suppressing the periodic oscillation of the voltage at the input terminal of the power supply device.

[0014] In some embodiments, in the same phase in which the oscillation difference value is negative, the oscillation difference value first decreases and then increases. Moreover, in the process of making the current at the input terminal of the bidirectional conversion circuit flow reversely out of the bidirectional conversion circuit, the operation of the bidirectional conversion circuit can also be controlled to make the size of the current flowing out of the input terminal of the bidirectional conversion circuit first increase and then decrease. In this way, the size of the current flowing out of the input terminal of the bidirectional conversion circuit can be changed following the change of the oscillation difference value, thereby improving the voltage stabilization effect at the input terminal of the bidirectional conversion circuit.

[0015] In some embodiments, in a plurality of different phases in which the oscillation difference value is negative, the minimum value of the oscillation difference value can be sequentially increased, and the maximum value of the size of the current flowing out of the input terminal of the bidirectional conversion circuit can be sequentially decreased, thereby further improving the voltage stabilization effect at the input terminal of the bidirectional conversion circuit. Further, in the plurality of different phases in which the oscillation difference value is negative, the maximum value of the size of the current flowing out of the input terminal of the bidirectional conversion circuit can be sequentially decreased by the same or different values.

[0016] In some embodiments, the energy storage component includes a storage capacitor to carry and provide energy through the storage capacitor. Illustratively, the storage capacitor can be configured as a capacitor with high withstand voltage, so that the energy in the bidirectional conversion circuit can be boosted, the number of capacitors can be greatly reduced, and the cost can be reduced. Since the bidirectional conversion circuit charges or discharges the storage capacitor when it is working, in order to avoid overvoltage or undervoltage of the storage capacitor, the voltage of the storage capacitor is kept stable. To this end, the control parameters obtained include not only the voltage and current of the input end of the bidirectional conversion circuit, but also the voltage of the storage capacitor. Based on this, in the method provided in the embodiments of the present application, the process of controlling the bidirectional conversion circuit to work based on the control parameters by the control circuit can include the following process: the control circuit outputs a driving signal to the bidirectional conversion circuit. Wherein, the duty cycle or switching frequency of the driving signal is determined according to the voltage and current of the input end of the bidirectional conversion circuit, and the voltage of the storage capacitor. By this setting, by outputting the driving signal to the bidirectional conversion circuit, the on-off state of the switch in the bidirectional conversion circuit is controlled through the driving signal, so as to adjust the direction and size of the current at the input end of the bidirectional conversion circuit. Wherein, the driving signal is a pulse width modulation (PWM) signal, which has a switching frequency and a duty cycle, so that the on-off state of the switch in the bidirectional conversion circuit can be adjusted by adjusting the switching frequency and / or the duty cycle, so as to adjust the direction and size of the current at the input end of the bidirectional conversion circuit.

[0017] In some embodiments, the duty cycle or switching frequency of the driving signal is determined based on the voltage and current of the input end of the bidirectional conversion circuit, and the voltage of the storage capacitor, which can specifically include the following process: the control circuit can determine a current reference value based on the voltage of the input end of the bidirectional conversion circuit. A current compensation value is determined according to the voltage of the storage capacitor. And, based on the difference between the sum of the current reference value and the current compensation value and the current of the input end of the bidirectional conversion circuit, the duty cycle or switching frequency of the driving signal is determined, so that the driving signal is output to the bidirectional conversion circuit based on the determined duty cycle or switching frequency of the driving signal, to control the bidirectional conversion circuit to work, and adjust the direction and size of the current at the input end of the bidirectional conversion circuit. By this setting, the process of adjusting the direction and size of the current at the input end of the bidirectional conversion circuit can be realized.

[0018] In some embodiments, the energy storage component includes an energy storage battery, and a relatively stable voltage can be provided by the energy storage battery to avoid under-voltage or over-voltage. Based on this, the control parameter obtained by the control circuit can include the voltage and current at the input end of the bidirectional conversion circuit. And, for the control circuit to control the bidirectional conversion circuit to work based on the control parameter, can include the following process: the control circuit outputs a drive signal to the bidirectional conversion circuit. Wherein, the duty cycle or switching frequency of the drive signal is determined based on the voltage and current at the input end of the bidirectional conversion circuit. Since the drive signal is a PWM signal, it has a switching frequency and a duty cycle, so by adjusting the switching frequency and / or the duty cycle, the on-off state of the switch in the bidirectional conversion circuit can be adjusted, and thus the direction and size of the current at the input end of the bidirectional conversion circuit can be adjusted.

[0019] In some embodiments, for the duty cycle or switching frequency of the drive signal to be determined based on the voltage and current at the input end of the bidirectional conversion circuit, can specifically include the following process: the control circuit determines a current reference value based on the voltage at the input end of the bidirectional conversion circuit. And, based on the difference between the current reference value and the current at the input end of the bidirectional conversion circuit, the duty cycle or switching frequency of the drive signal is determined, so that the drive signal can be output to the bidirectional conversion circuit according to the determined duty cycle or switching frequency of the drive signal, to control the bidirectional conversion circuit to work, to adjust the direction and size of the current at the input end of the bidirectional conversion circuit. By this setting, the process of adjusting the direction and size of the current at the input end of the bidirectional conversion circuit can be realized.

[0020] In some embodiments, the method further includes, in response to the voltage at the input end of the bidirectional conversion circuit being in the reference voltage threshold interval, the control circuit controls the bidirectional conversion circuit to stop working. Based on this, the power supply stabilizing device can not consume power of the power supply device, so that power consumption can be greatly reduced and conversion efficiency can be improved. And, generally, the input end of the power supply device is connected in parallel with an input capacitor or a resistance-capacitance, and the input capacitor or resistance-capacitance can be combined to keep the voltage at the input end of the power supply device stable when the bidirectional conversion circuit stops working.

[0021] In some embodiments, if the reference voltage threshold interval is [U0-ΔU1, U0+ΔU2], U0 represents the reference voltage, and ΔU1 and ΔU2 are not equal to zero, during the process of switching the oscillation difference between the positive value and the negative value, the voltage at the input end of the bidirectional conversion circuit has two parts: the first part voltage and the second part voltage, the first part voltage is not in the reference voltage threshold interval, and the second part voltage is in the reference voltage threshold interval. For the first part voltage, the control circuit can control the bidirectional conversion circuit to work according to the control parameter to adjust the current at the input end of the bidirectional conversion circuit and reduce the periodic oscillation. For the second part voltage, the control circuit can control the bidirectional conversion circuit to stop working to reduce power consumption.

[0022] For example, in the same phase when the oscillation difference is positive, the voltage at the input of the bidirectional conversion circuit has two parts: a first part of voltage and a second part of voltage, wherein the first part of voltage is greater than the upper limit of the reference voltage threshold interval, and the second part of voltage is less than or equal to the upper limit of the reference voltage threshold interval and greater than or equal to the reference voltage. When the first part of voltage occurs, the control circuit can control the bidirectional conversion circuit to work according to the control parameter, adjust the current at the input of the bidirectional conversion circuit, and reduce the periodic oscillation. When the second part of voltage occurs, the control circuit can control the bidirectional conversion circuit to stop working, thereby reducing power consumption.

[0023] For example, in the same phase when the oscillation difference is negative, the voltage at the input of the bidirectional conversion circuit also has two parts: a first part of voltage and a second part of voltage, wherein the first part of voltage is less than the lower limit of the reference voltage threshold interval, and the second part of voltage is greater than or equal to the lower limit of the reference voltage threshold interval and less than or equal to the reference voltage. When the first part of voltage occurs, the control circuit can control the bidirectional conversion circuit to work according to the control parameter, adjust the current at the input of the bidirectional conversion circuit, and reduce the periodic oscillation. When the second part of voltage occurs, the control circuit can control the bidirectional conversion circuit to stop working, thereby reducing power consumption.

[0024] In some embodiments, when the reference voltage threshold interval is [U0-ΔU1, U0+ΔU2], U0 represents the reference voltage, and ΔU1 and ΔU2 are both equal to zero, in the process of switching the oscillation difference between positive and negative, the voltage at the input of the bidirectional conversion circuit has two parts: a first part of voltage and a second part of voltage, wherein the first part of voltage is not equal to the reference voltage, and the second part of voltage is equal to the reference voltage. When the first part of voltage occurs, the control circuit can control the bidirectional conversion circuit to work according to the control parameter, adjust the current at the input of the bidirectional conversion circuit, and reduce the periodic oscillation. When the second part of voltage occurs, the control circuit can control the bidirectional conversion circuit to stop working, thereby reducing power consumption.

[0025] For example, in the same phase when the oscillation difference is positive, the voltage at the input of the bidirectional conversion circuit has two parts: a first part of voltage and a second part of voltage, wherein the first part of voltage is greater than the reference voltage, and the second part of voltage is equal to the reference voltage. When the first part of voltage occurs, the control circuit can control the bidirectional conversion circuit to work according to the control parameter, adjust the current at the input of the bidirectional conversion circuit, and reduce the periodic oscillation. When the second part of voltage occurs, the control circuit can control the bidirectional conversion circuit to stop working, thereby reducing power consumption.

[0026] For example, in the same phase where the oscillation difference is negative, the voltage of the input end of the bidirectional conversion circuit also has two parts: a first part voltage and a second part voltage, where the first part voltage is less than the reference voltage, and the second part voltage is equal to the reference voltage. For the first part voltage, the control circuit can control the bidirectional conversion circuit to work according to the control parameter, adjust the current of the input end of the bidirectional conversion circuit, and reduce the periodic oscillation. For the second part voltage, the control circuit can control the bidirectional conversion circuit to stop working, and reduce power consumption.

[0027] In a second aspect, the embodiments of the present application also provide a power supply stabilizing device, which comprises a bidirectional conversion circuit, an energy storage component, and a control circuit. The input end of the bidirectional conversion circuit is used to be connected in parallel with the input end of a power supply device, and the output end of the bidirectional conversion circuit is connected with the energy storage component. Moreover, the control circuit can be used to execute the voltage control method described in the first aspect or any possible implementation manner of the first aspect. Specifically, the control circuit is used to, in response to the oscillation difference switching between positive and negative, and the voltage of the input end of the bidirectional conversion circuit not being located in the reference voltage threshold interval, control the bidirectional conversion circuit to work based on the control parameter, adjust the current of the input end of the bidirectional conversion circuit, and make the voltage of the input end of the bidirectional conversion circuit located in the reference voltage threshold interval; the control parameter at least comprises the current and the voltage of the input end of the bidirectional conversion circuit; where the oscillation difference is the difference between the voltage of the input end of the bidirectional conversion circuit and the reference voltage, and the reference voltage is the voltage of the input end of the input power supply device.

[0028] Moreover, the technical effects of the corresponding solutions in the second aspect can refer to the technical effects that can be obtained by the corresponding solutions in the first aspect, and the repeated parts will not be described in detail.

[0029] In some embodiments, the power supply stabilizing device further comprises a voltage stabilizing capacitor connected in parallel with the input end of the bidirectional conversion circuit. In this way, the voltage of the input end of the bidirectional conversion circuit is stabilized by using the voltage stabilizing capacitor, and after the input end of the power supply stabilizing device is connected in parallel with the input end of the power supply device, the voltage of the input end of the power supply device can be stabilized in combination with the voltage stabilizing capacitor and the input capacitor. Moreover, after the bidirectional conversion circuit stops working, the voltage stabilizing can be performed simultaneously in combination with the voltage stabilizing capacitor and the input capacitor, and the voltage stabilizing effect is improved.

[0030] In some embodiments, the bidirectional conversion circuit can include at least one of the following circuit types: a bidirectional boost circuit, a bidirectional buck circuit, a bidirectional buck-boost circuit, or a dual active bridge circuit. With such an arrangement, a bidirectional conversion circuit with a simple structure can be achieved. Moreover, in practical applications, the topology of the bidirectional boost circuit, the bidirectional buck circuit, the bidirectional buck-boost circuit, or the dual active bridge circuit is relatively mature, and the bidirectional conversion circuit can be relatively simple to implement, thereby reducing the design difficulty and production cost. If the power supply stabilizing device in the present application is integrated in the power supply equipment, the size of the existing power supply equipment will not be significantly increased. In addition, more power can be supplied in the case of a change in the supply voltage and a sudden load of the power consumption device, thereby preventing power supply equipment from inputting and outputting power failure.

[0031] In a third aspect, the embodiments of the present application also provide a power supply equipment, which includes: a voltage conversion circuit and a power supply stabilizing device. The input end of the voltage conversion circuit is configured to receive a voltage, the output end of the voltage conversion circuit is configured to be connected to a power consumption device, and the voltage conversion circuit is configured to convert the received voltage and output the converted voltage to the power consumption device. Moreover, the input end of the power supply stabilizing device is connected in parallel with the input end of the voltage conversion circuit, and the power supply stabilizing device is configured to stabilize the voltage at the input end of the voltage conversion circuit. With such an arrangement, the power supply stabilizing device can be integrated inside the power supply equipment. Since the bidirectional conversion circuit is relatively mature and has a high integration level, if the power supply stabilizing device in the present application is integrated in the power supply equipment, the size of the existing power supply equipment will not be significantly increased.

[0032] The power supply stabilizing device is described in the second aspect or any possible implementation manner of the second aspect.

[0033] In a fourth aspect, the embodiments of the present application also provide a power supply equipment, which includes one or more power supply equipments. The power supply equipment is described in the third aspect or any possible implementation manner of the third aspect.

[0034] In a fifth aspect, the embodiments of the present application also provide a power supply equipment, which includes: one or more power supply equipments and one or more power supply stabilizing devices. The input ends of the power supply equipments are connected in parallel with each other, the output ends of the power supply equipments are connected to a power consumption device, and the power supply equipments are configured to convert an input voltage and output the converted voltage to the power consumption device. Moreover, the input ends of the power supply stabilizing devices are connected in parallel with the input ends of the voltage conversion circuits, and the power supply stabilizing devices are configured to stabilize the voltage at the input ends of the voltage conversion circuits. With such an arrangement, the power supply stabilizing devices can be arranged outside the power supply equipment, and the power supply stabilizing devices and the power supply equipment can be connected in parallel to achieve the purpose of stabilization, thereby eliminating the need to redesign the power supply equipment.

[0035] The power supply stabilizing device is the power supply stabilizing device described in the second aspect or any possible implementation manner of the second aspect.

[0036] In a sixth aspect, the embodiments of the present application further provide a communication device, comprising a power consuming device and a power supply device, wherein the output end of the power supply device is connected with the power consuming device. The power supply device is the power supply device described in the fourth aspect or any possible implementation manner of the fourth aspect. Alternatively, the power supply device is the power supply device described in the fifth aspect or any possible implementation manner of the fifth aspect.

[0037] In addition, the technical effects of the corresponding solutions in the third aspect to the sixth aspect can be obtained by referring to the technical effects of the corresponding solutions in the first aspect and the second aspect, and the repeated parts will not be described in detail. BRIEF DESCRIPTION OF DRAWINGS

[0038] FIG. 1 is a structural block diagram of a communication device according to an embodiment of the present application;

[0039] FIGS. 2a to 2d are structural schematic diagrams of a power supply device according to an embodiment of the present application;

[0040] FIG. 3a is a schematic diagram of periodic oscillation of the voltage at the input end of the power supply device according to an embodiment of the present application;

[0041] FIG. 3b is another schematic diagram of periodic oscillation of the voltage at the input end of the power supply device according to an embodiment of the present application;

[0042] FIG. 3c is another schematic diagram of periodic oscillation of the voltage at the input end of the power supply device according to an embodiment of the present application;

[0043] FIG. 4 is a structural schematic diagram of a power supply stabilizing device according to an embodiment of the present application;

[0044] FIG. 5a is a circuit structural schematic diagram of a bidirectional boost circuit according to an embodiment of the present application;

[0045] FIG. 5b is a circuit structural schematic diagram of a bidirectional buck circuit according to an embodiment of the present application;

[0046] FIG. 5c is a circuit structural schematic diagram of a bidirectional buck-boost circuit according to an embodiment of the present application;

[0047] FIG. 5d is another circuit structural schematic diagram of a bidirectional buck-boost circuit according to an embodiment of the present application;

[0048] FIG. 5e is a circuit structural schematic diagram of a dual active full bridge circuit according to an embodiment of the present application;

[0049] FIG6 is a schematic diagram of another structure of a power stabilization device provided in an embodiment of the present application;

[0050] FIG7 is a schematic diagram of another structure of a power stabilization device provided in an embodiment of the present application;

[0051] FIG8 is a schematic structural diagram of a power supply device provided in an embodiment of the present application;

[0052] FIG9 is another structural diagram of a power supply device provided in an embodiment of the present application.

[0053] Reference numerals 10 - communication device; 100 - power supply device; 110 - power supply device; 120 - power supply device; 200 - power consumption device; 300 - power supply stabilization device; 310 - bidirectional conversion circuit; 311 - bidirectional boost circuit; 312 - bidirectional buck circuit; 313\314 - bidirectional buck-boost circuit; 315 - dual active full-bridge circuit; 320 - energy storage component; 330 - control circuit; Aus+ - positive line; Aus- - negative line; VIN+ - 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-voltage stabilizing capacitor; CH-storage capacitor; L1\L2\L3\L4\L5-inductor; C0-capacitor; T-transformer. DETAILED DESCRIPTION

[0054] In order to make the purposes, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to the drawings. The specific operation 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 the present application, "at least one" refers to one or more, wherein more refers to two or more. In view of this, "more" in the embodiments of the present application can also be understood as "at least two". "And / or", which describes the association relationship of the associated objects, means that there can be three kinds of relationships, for example, A and / or B can represent the following three cases: A exists alone, A and B exist together, and B exists alone. Moreover, the character " / ", if not specially stated, generally represents that the associated objects before and after it are in an "or" relationship. In addition, the words "first", "second", etc. are only used for the purpose of distinguishing the description and cannot be understood as indicating or implying relative importance. In addition, "connection" in the embodiments of the present application refers to electrical connection, and the connection between two electrical elements can be direct connection between the two electrical elements or indirect connection through an intermediate medium. For example, A is connected with B, which can be direct connection between A and B, or indirect connection between A and B through one or more other electrical elements, for example, A is connected with B, which can be direct connection between A and C, direct connection between C and B, and connection between A and B through C.

[0055] It should be noted that the same reference signs in the drawings of the present application represent the same or similar structures, so repeated description thereof will be omitted. The expressions of position and direction described in the present application are described with reference to the drawings, but changes can also be made as needed, and the changes made are included in the scope of protection of the present application. The drawings of the present application are only used to show the relative positional relationship and do not represent the true proportions.

[0056] The switch in the embodiments of the present application can be one or more of a relay, a metal oxide semiconductor field effect transistor (MOSFET), a bipolar junction transistor (BJT), an insulated gate bipolar transistor (IGBT), a silicon carbide (SiC) MOSFET, a GaN semiconductor device, a Schottky diode, and the like. The embodiments of the present application do not list all the types of switch devices. Each switch can include a first terminal, a second terminal, and a control terminal. The control terminal is used to control the closing or opening of the switch. When the switch is closed, current can be transmitted between the first terminal and the second terminal of the switch. When the switch is open, current cannot be transmitted between the first terminal and the second terminal of the switch. Taking the 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.

[0057] The power supply stabilizing device provided by the embodiments of the present application can be applied to any power supply device that converts voltage (for example, direct current (DC) voltage or alternating current (AC) voltage). The power supply device can be applied to a communication device (for example, a base station) to supply power to the power-consuming device in the communication device. Of course, the power supply device can also be applied to other devices, which are not limited herein. The power supply stabilizing device, the power supply device, the power supply device, and the communication device provided by the embodiments of the present application are described below in conjunction with the accompanying drawings.

[0058] Fig. 1 is a structural block diagram of a communication device according to an embodiment of the present application. Referring to Fig. 1, the communication device 10 can include a power supply device 100 and a power consumption device 200. The power supply device 100 includes a power supply source device 110 and a power source device 120. The input end of the power supply source device 110 is connected with an input power source, the output end of the power supply source device 110 is connected with the input end of the power source device 120 through a wire (for example, Aus+, Aus-), and the output end of the power source device 120 is connected with the power consumption device 200. In operation, the power source device 120 can be a direct current power source device, and the power supply source device 110 can convert alternating current or direct current into direct current and then output to the wire, the power source device 120 can convert the direct current on the wire (for example, Aus+, Aus-) into direct current or alternating current and then output to the power consumption device 200 to supply power to the power consumption device 200. In addition, the wire has a positive wire Aus+ and a negative wire Aus-, the positive wire Aus+ is connected with the positive input end of the input end of the power source device 120, and the negative wire Aus- is connected with the negative input end of the input end of the power source device 120. Of course, the power source device 120 can also be an alternating current power source device, and the power supply source device 110 can also convert alternating current or direct current into alternating current and then output to the wire, the power source device 120 can convert the alternating current on the wire (for example, Aus+, Aus-) into direct current or alternating current and then output to the power consumption device 200 to supply power to the power consumption device 200.

[0059] The power consumption device 200 can be an alternating current power consumption device or a direct current power consumption device. For example, the power consumption device 200 can be a computer, a server, a hardware single board, etc., and the power supply source device can be a rectifier cabinet, a storage battery or a conversion circuit. The power supply device in the embodiment of the present application can also be applied to the application scenario of supplying power to a family or a commercial and industrial enterprise, for example, the power consumption device is an electrical appliance (such as a refrigerator, an air conditioner, etc.). The power supply device in the embodiment of the present application can also be applied to a micro-grid, such as a photovoltaic micro-grid.

[0060] Hereinafter, the power source device 120 is taken as a direct current power source device for example, and the working process of the power source device 120 as an alternating current power source device can refer to the working process of the power source device 120 as a direct current power source device, which will not be described here in detail.

[0061] In some examples, referring to FIG. 2a and FIG. 2b, which are respectively a structural schematic diagram of a power supply device provided by an embodiment of the present application, the input power supply can be a direct current (DC) power supply, and the power supply device can include a direct current-direct current (DC-DC) conversion circuit to convert the direct current of the input power supply into direct current and then output to the wiring. The power supply device includes a voltage conversion circuit, referring to FIG. 2a, which can be a DC-DC conversion circuit to convert the direct current on the wiring into direct current and then output to the power consumption device to supply power to the direct current power consumption device. Of course, the voltage conversion circuit can also be set as a DC-AC conversion circuit and an alternating current-direct current (AC-DC) conversion circuit, so as to first convert the direct current into alternating current, and then convert the alternating current into direct current and output to the power consumption device to supply power to the direct current power consumption device. Alternatively, referring to FIG. 2b, the voltage conversion circuit can also be a direct current-alternating current (DC-AC) conversion circuit to convert the direct current on the wiring into alternating current and then output to the power consumption device to supply power to the alternating current power consumption device. Of course, the voltage conversion circuit can also be set as a DC-DC conversion circuit and a DC-AC conversion circuit, so as to first convert the direct current into direct current, and then convert the direct current into alternating current and output to the power consumption device to supply power to the alternating current power consumption device.

[0062] In yet some examples, referring to FIG. 2c and FIG. 2d, which are respectively another structural schematic diagram of a power supply device provided by an embodiment of the present application, the input power supply can also be an alternating current (AC) power supply, and the power supply device can include an AC-DC conversion circuit to convert the alternating current of the input power supply into direct current and then output to the wiring. For example, referring to FIG. 2c, the voltage conversion circuit in the power supply device can be a DC-DC conversion circuit to convert the direct current on the wiring and then output to the power consumption device to supply power to the direct current power consumption device. Of course, the voltage conversion circuit can also be set as a DC-AC conversion circuit and an AC-DC conversion circuit, so as to first convert the direct current into alternating current, and then convert the alternating current into direct current and output to the power consumption device to supply power to the direct current power consumption device. Alternatively, referring to FIG. 2d, the voltage conversion circuit can also be a DC-AC conversion circuit to convert the direct current on the wiring into alternating current and then output to the power consumption device to supply power to the alternating current power consumption device. Of course, the voltage conversion circuit can also be set as a bidirectional conversion circuit and a DC-AC conversion circuit, so as to first convert the direct current into direct current, and then convert the direct current into alternating current and output to the power consumption device to supply power to the alternating current power consumption device.

[0063] Generally, there is a certain distance between the power supply device and the power supply device, resulting in a certain length of wiring. The front-stage power supply device will output the supply voltage E to the wiring. Since the wiring has parasitic inductance and parasitic resistance, it is equivalent to connecting the inductance and resistance in series between the front-stage power supply device and the power supply device, resulting in a certain loss of the supply voltage E after flowing through the wiring, causing the voltage at the input end of the input power supply device to become a reference voltage U0 (for example, 48V or 60V). The power supply device can perform voltage conversion (for example, step-up conversion or step-down conversion) on the reference voltage U0 and output it to the power consumption device. In actual applications, the input end of the power supply device is usually connected in parallel with an input capacitor or resistor-capacitor. In this way, when the parasitic inductance and parasitic resistance on the wiring, the input capacitor or resistor-capacitor connected in parallel with the input end of the power supply device, and the power mismatch caused by changes on the power consumption side, the voltage at the input end of the power supply device will cause periodic oscillations, seriously affecting the stability of the output voltage of the power supply device. Especially for network and computing equipment in field application scenarios, the distance between the power supply equipment and the power supply equipment is relatively far, usually more than 20 meters, and may even reach more than 100 meters. The voltage periodic oscillation at the input end of the power supply equipment is more serious.

[0064] For example, referring to FIG3a, FIG3a is a schematic diagram of a voltage at the input terminal of a power supply device provided in an embodiment of the present application performing periodic oscillations. The voltage at the input terminal of the power supply device performs periodic oscillations around a reference voltage U0. In the Z1 phase, the voltage u at the input terminal of the power supply device is in is greater than the reference voltage U0, then the voltage u in Subtract the difference of the reference voltage U0: oscillation difference (ie U in -U0) is positive, and the oscillation difference (i.e. U in -U0) increases first and then decreases. And, in the Z2 stage, the voltage u at the input end of the power supply device in is less than the reference voltage U0, then the oscillation difference (i.e. u in -U0) is negative, and the oscillation difference (i.e. u in -U0) first decreases and then increases. Therefore, in actual operation, the Z1 stage and the Z2 stage appear alternately, so that the oscillation difference of the voltage at the input end of the power supply device switches between positive and negative values. It can be understood that in actual operation, the voltage u in The waveform is similar to a sine wave, that is, the voltage u in The waveform deviates from the sine wave and is not a true sine wave. In addition, the oscillation difference decreases from a positive value to zero and then switches to a negative value, and the oscillation difference increases from a negative value to zero and then switches to a positive value.

[0065] In related technologies, there are generally three methods for solving the voltage periodic oscillation phenomenon at the input end of a power supply device, as follows:

[0066] The first method is to add passive devices such as series or parallel inductors, resistors, capacitors, etc. to the wire, change the impedance characteristics of the input end of the power supply device, and suppress the periodic oscillation of the voltage at the input end of the power supply device. However, in this method, the actual resistance is increased, the system loss is increased, and the conversion efficiency is reduced. In addition, as the power of the power supply device increases, the number of capacitors needed also increases, even to hundreds, resulting in an increase in the size of the power supply device, which is not conducive to the demand for miniaturization.

[0067] The second method is to connect a DC-DC conversion circuit in series at the input end of the power supply device, that is, to set a DC-DC conversion circuit between the wire and the power supply device, and to suppress the periodic oscillation of the voltage at the input end of the power supply device through closed-loop control of the DC-DC conversion circuit. However, in this method, the DC-DC conversion circuit is used to convert the direct current on the wire and then output it to the power supply device, which increases the system loss and reduces the conversion efficiency.

[0068] The third method is to set a front feedback control in the power supply device to control the stability of the input end voltage of the power supply device. However, in order to ensure the stability of the output end of the power supply device, a back feedback control also needs to be set in the power supply device to control the stability of the output end voltage of the power supply device. This results in a contradiction between the control methods of the power supply device, which is prone to unstable operation.

[0069] Therefore, the embodiments of the present application provide a power supply stabilizing device to suppress the periodic oscillation of the voltage at the input end of the power supply device and reduce the system loss and improve the conversion efficiency.

[0070] FIG. 4 is a structural schematic diagram of a power supply stabilizing device provided by the embodiments of the present application. Referring to FIG. 4, the power supply stabilizing device 300 can include a bidirectional conversion circuit 310, an energy storage component 320, and a control circuit 330. The input end of the bidirectional conversion circuit 310 is connected in parallel with the input end of the power supply device 120, and the output end of the bidirectional conversion circuit 310 is connected with the energy storage component 320. Specifically, the input end of the bidirectional conversion circuit 310 has a positive input end VIN+ and a negative input end VIN-, the positive input end VIN+ is used to connect with the positive input end of the power supply device 120, and the negative input end VIN- is used to connect with the negative input end of the power supply device 120. The output end of the bidirectional conversion circuit 310 has a positive output end VO+ and a negative output end VO-, the positive output end VO+ is connected with the positive input end of the energy storage component 320, and the negative output end VO- is connected with the negative input end of the energy storage component 320.

[0071] Since the input end of the bidirectional conversion circuit 310 is connected in parallel with the input end of the power supply device 120, the voltage u of the input end of the bidirectional conversion circuit 310 is equal to the voltage u of the input end of the power supply device 120. inThe same as the voltage at the input terminal of the power supply device 120. Therefore, the control circuit 330 can obtain the control parameters, which at least include the voltage u at the input terminal of the bidirectional conversion circuit 310. in and current i in , that is, at least the voltage u is obtained in and current i in The control circuit 330 can be based on the oscillation difference (ie u in -U0) switches between positive and negative values, depending on the voltage u in The relationship between the reference voltage threshold interval [U0-ΔU1, U0+ΔU2] is used to control the working state of the bidirectional conversion circuit 310, thereby adjusting the voltage u in , thereby achieving the effect of suppressing the periodic oscillation of the voltage at the input end of the power supply device 120.

[0072] For example, referring to FIG3b and FIG3c, FIG3b and FIG3c are respectively another schematic diagram of the voltage at the input end of the power supply device provided in the embodiment of the present application performing periodic oscillation. If the voltage u in It is not in the reference voltage threshold interval [U0-ΔU1, U0+ΔU2], indicating that the voltage u in If there is a large oscillation, the voltage at the input end of the power supply device 120 will also have a large oscillation. In order to reduce the oscillation, the control circuit 330 can control the operation of the bidirectional conversion circuit 310 according to the control parameters and adjust the current i at the input end of the bidirectional conversion circuit 310. in , to change the voltage u in The size of the oscillation difference changes, which in turn makes the voltage u in It can be located in the reference voltage threshold interval [U0-ΔU1, U0+ΔU2] to achieve the purpose of stability and realize the effect of suppressing the periodic oscillation of the voltage at the input end of the power supply device 120.

[0073] Compared to the first method in the related art, the effect of suppressing the periodic oscillation of the voltage at the input end of the power supply device 120 can be achieved without connecting an inductor in series with the wiring or the input end of the power supply device or an additional capacitor and resistor in parallel. In addition, bidirectional conversion circuits are generally relatively mature and have a high degree of integration. If the power supply stabilization device in this application is integrated into the power supply device, it will not increase the size of the existing power supply device excessively. In addition, when the input voltage of the power supply device 120 is different and the power-consuming device 200 is different, the power supply stabilization device 300 in the embodiment of this application can also ensure the voltage stability of its input end.

[0074] Compared with the second method in the related art, the bidirectional conversion circuit in the present application is connected in parallel with the input end of the power supply device, and does not need to convert the voltage on the wire and output to the power supply device, so that excessive loss can be avoided, and the conversion efficiency of the power supply device is improved.

[0075] Compared with the third method in the prior art, the present application does not need to increase the function of controlling the input end voltage stability in the power supply device, and when the power supply device controls the stability of the output end voltage through feedback, the problem of unstable work can be avoided.

[0076] In addition, in the present application, since the bidirectional conversion circuit and the energy storage component are arranged, when the control circuit controls the bidirectional conversion circuit to work to adjust the current i in , the current i in can be controlled to flow into the bidirectional conversion circuit in the forward direction, at this time, the energy storage component can bear energy, and the stable work of the bidirectional conversion circuit is ensured. When the control circuit controls the bidirectional conversion circuit to work to adjust the current i in , the current i in can be controlled to flow out of the bidirectional conversion circuit in the reverse direction, at this time, the energy storage component can provide energy, and the stable work of the bidirectional conversion circuit is ensured.

[0077] Exemplarily, if the power supply device 120 is a direct current power supply device, the bidirectional conversion circuit 310 can be a DC-DC conversion circuit. If the power supply device 120 is an alternating current power supply device, the bidirectional conversion circuit 310 can be an AC-DC conversion circuit. Hereinafter, the power supply device 120 is taken as a direct current power supply device, and the bidirectional conversion circuit 310 is taken as a DC-DC conversion circuit as an example for description.

[0078] Referring to FIGS. 3b and 3c, if the voltage u in of the input end of the bidirectional conversion circuit 310 is located in the reference voltage threshold interval [U0-ΔU1, U0+ΔU2], it indicates that the oscillation difference of the voltage u in is small, which meets the running allowable range or can be ignored. Based on this, the control circuit 330 can control the bidirectional conversion circuit 310 to stop working, at this time, there is no current flowing through the input end of the bidirectional conversion circuit 310, so that the power supply stabilizing device does not consume the power of the power supply device 120, so that the power loss can be greatly reduced, and the conversion efficiency is improved. Moreover, generally, the input end of the power supply device 120 is connected in parallel with an input capacitor or a resistance-capacitance, and when the bidirectional conversion circuit 310 stops working, the input capacitor or the resistance-capacitance can be combined to keep the voltage of the input end of the power supply device 120 stable.

[0079] It can be understood that ΔU1 can be set to zero or a value greater than zero, wherein when ΔU1 is set to a value greater than zero, ΔU1 can be made to approach zero to meet the effect of suppressing the periodic oscillation of the voltage at the input end of the power supply device 120. And ΔU2 can be set to zero or a value greater than zero, wherein when ΔU2 is set to a value greater than zero, ΔU2 can be made to approach zero to meet the effect of suppressing the periodic oscillation of the voltage at the input end of the power supply device 120. In addition, ΔU1 and ΔU2 can be the same or different. And in actual application, the specific value of ΔU1 and ΔU2 can be determined according to the needs of the actual application scene, which is not limited here.

[0080] If ΔU1 and ΔU2 are not equal to zero, referring to FIG. 3b, the oscillation difference (i.e. u in In the process of switching between positive and negative values of the oscillation difference (i.e. u in has two parts: the first part voltage and the second part voltage, the first part voltage is not located in the reference voltage threshold interval [U0-ΔU1, U0+ΔU2], and the second part voltage is located in the reference voltage threshold interval [U0-ΔU1, U0+ΔU2]. For the first part voltage, the control circuit 330 can control the bidirectional conversion circuit 310 to work according to the control parameter, and there is current flowing through the input end of the bidirectional conversion circuit 310, reducing the periodic oscillation. For the second part voltage, the control circuit 330 can control the bidirectional conversion circuit 310 to stop working, and there is no current flowing through the input end of the bidirectional conversion circuit 310, reducing power consumption. Therefore, when the voltage u in When the voltage u

[0081] For example, in the same phase when the oscillation difference (i.e. u in In the same phase when the oscillation difference (i.e. u in has two parts: the first part voltage and the second part voltage, wherein the first part voltage is greater than the upper limit U0+ΔU2 of the reference voltage threshold interval, and the second part voltage is less than or equal to the upper limit U0+ΔU2 of the reference voltage threshold interval and greater than or equal to the reference voltage U0. For the first part voltage, there is current flowing through the input end of the bidirectional conversion circuit 310. For the second part voltage, there is no current flowing through the input end of the bidirectional conversion circuit 310.

[0082] For example, in the same phase when the oscillation difference (i.e. u in In the same phase when the oscillation difference (i.e. u inAlso has two parts: the first part voltage and the second part voltage, wherein the first part voltage is less than the lower limit U0-ΔU1 of the reference voltage threshold interval, and the second part voltage is greater than or equal to the lower limit U0-ΔU1 of the reference voltage threshold interval and less than or equal to the reference voltage U0. For the first part voltage, the input end of the bidirectional conversion circuit 310 has current flowing through. For the second part voltage, the input end of the bidirectional conversion circuit 310 has no current flowing through.

[0083] If ΔU1 and ΔU2 are both equal to zero, referring to FIG. 3c, the oscillation difference (i.e. u in In the process of switching between the positive value and the negative value of the oscillation difference (i.e. u in Has two parts: the first part voltage and the second part voltage, wherein the first part voltage is not equal to the reference voltage U0, and the second part voltage is equal to the reference voltage U0. For the first part voltage, the control circuit 330 can control the bidirectional conversion circuit 310 to work according to the control parameter, adjust the current of the input end of the bidirectional conversion circuit 310, and reduce the periodic oscillation. For the second part voltage, the control circuit 330 can control the bidirectional conversion circuit 310 to stop working, and reduce the power consumption. Therefore, the current waveform of the input end of the bidirectional conversion circuit 310 is continuous.

[0084] For example, in the same phase of the oscillation difference (i.e. u in In the same phase of the oscillation difference (i.e. u in Has two parts: the first part voltage and the second part voltage, wherein the first part voltage is greater than the reference voltage U0, and the second part voltage is equal to the reference voltage U0. For the first part voltage, the input end of the bidirectional conversion circuit 310 has current flowing through. For the second part voltage, the input end of the bidirectional conversion circuit 310 has no current flowing through.

[0085] For example, in the same phase of the oscillation difference (i.e. u in In the same phase of the oscillation difference (i.e. u in Also has two parts: the first part voltage and the second part voltage, wherein the first part voltage is less than the reference voltage U0, and the second part voltage is equal to the reference voltage U0. For the first part voltage, the input end of the bidirectional conversion circuit 310 has current flowing through. For the second part voltage, the input end of the bidirectional conversion circuit 310 has no current flowing through.

[0086] It is worth mentioning that the power stabilizing device 300 in the embodiments of the present application can be applied in the scenario of the power supply device 100 with different U0, that is, no matter what the reference voltage U0 of the input end of the power supply device 120 is, the power stabilizing device 300 in the embodiments of the present application can automatically obtain the reference voltage U0, and based on this, the U0 in the reference voltage threshold interval [U0-ΔU1, U0+ΔU2] can be automatically adjusted to suppress the periodic oscillation of the voltage at the input end of the power supply device 120.

[0087] Exemplarily, the control circuit can be a field programmable gate array (FPGA), a general central processing unit (CPU), a general processor, a digital signal processing (DSP), an application specific integrated circuits (ASIC), or other programmable logic devices, transistor logic devices, hardware components, or any combination thereof. It can implement or execute various exemplary logic blocks, modules and circuits described in combination with the disclosure of the present application. The control circuit described above can also be a combination of computing functions, such as one or more microprocessor combinations, combinations of DSP and microprocessor, etc.

[0088] Referring to FIG. 4, the power stabilizing device 300 further comprises a voltage stabilizing capacitor CN connected in parallel to the input end of the bidirectional conversion circuit 310. Specifically, the first end of the voltage stabilizing capacitor CN is connected to the positive input end VIN+ of the bidirectional conversion circuit 310, and the second end of the voltage stabilizing capacitor CN is connected to the negative input end VIN- of the bidirectional conversion circuit 310. By this arrangement, the voltage at the input end of the bidirectional conversion circuit 310 is stabilized by using the voltage stabilizing capacitor CN. After the input end of the power stabilizing device 300 is connected in parallel to the input end of the power supply device 120, the voltage at the input end of the power supply device 120 can be stabilized in combination with the voltage stabilizing capacitor and the input capacitor. Moreover, after the bidirectional conversion circuit 310 stops working, the voltage can be stabilized simultaneously in combination with the voltage stabilizing capacitor and the input capacitor, thereby improving the voltage stabilizing effect.

[0089] Continuing to refer to FIG. 4, the energy storage component 320 can comprise a storage capacitor CH, which carries and provides energy through the storage capacitor CH. Specifically, the first end of the storage capacitor CH is connected to the positive output end VO+ of the bidirectional conversion circuit 310, and the second end of the storage capacitor CH is connected to the negative output end VO- of the bidirectional conversion circuit 310.

[0090] In the power stabilizing device 300, the bidirectional conversion circuit 310 can be a bidirectional boost circuit, a bidirectional buck circuit, a bidirectional buck-boost circuit or a dual active bridge circuit. In this way, a bidirectional conversion circuit 310 with a simple structure can be achieved. In practical applications, the topology of the bidirectional boost circuit, the bidirectional buck circuit, the bidirectional buck-boost circuit or the dual active bridge circuit is relatively mature, and the bidirectional conversion circuit 310 can be relatively simple to implement, thereby reducing the design difficulty and the production cost. If the power stabilizing device in the present application is integrated in the power supply device, the size of the existing power supply device will not be significantly increased. In addition, more power can be supplied in the case of a change in the supply voltage E and a sudden load of the power consumption device 200, thereby preventing the power supply device 120 from inputting and outputting power failure. It is worth mentioning that the above is only an example of the specific topology of the bidirectional conversion circuit 310. In specific implementation, the specific topology of the bidirectional conversion circuit 310 is not limited to the above topology provided by the embodiments of the present application, but can also be other topologies known to those skilled in the art, which are not limited herein.

[0091] In some embodiments, the bidirectional boost circuit has multiple topologies, and the present application does not limit the specific form of the bidirectional boost circuit topology. The topology of the bidirectional boost circuit is described below. For example, referring to FIG. 5a, which is a schematic diagram of a circuit structure of a bidirectional boost circuit provided by the embodiments of the present application, the bidirectional conversion circuit 310 is configured as a bidirectional boost circuit 311, and the bidirectional boost circuit 311 includes an inductor L1 and switches S11 and S12, wherein the first end of the inductor L1 is connected to the positive input terminal VIN+ of the bidirectional conversion circuit 310, 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 bidirectional conversion circuit 310, and the first end of the switch S12 is connected to the negative output terminal VO- of the bidirectional conversion circuit 310.

[0092] In some embodiments, the bidirectional buck circuit also has various topologies, and the application does not limit the specific form of the topology of the bidirectional buck circuit. The topology of the bidirectional buck circuit is schematically described below. For example, referring to FIG. 5b, which is a schematic diagram of a circuit structure of a bidirectional buck circuit provided in an embodiment of the application, the bidirectional conversion circuit 310 is configured as a bidirectional buck circuit 312, and the bidirectional buck circuit 312 includes an inductor L2 and switches S21 and S22, wherein the first end of the switch S21 is connected to the positive input terminal VIN+ of the bidirectional conversion circuit 310, the first end of the switch S22 is connected to the negative input terminal VIN- of the bidirectional conversion circuit 310, the first end of the inductor L2 is connected to the second end of the switch S21 and the second end of the switch S22, respectively, the second end of the inductor L2 is connected to the positive output terminal VO+ of the bidirectional conversion circuit 310, and the first end of the switch S22 is also connected to the negative output terminal VO- of the bidirectional conversion circuit 310.

[0093] In some embodiments, the bidirectional buck-boost circuit also has various topologies, and the application does not limit the specific form of the topology of the bidirectional buck-boost circuit. The topology of the bidirectional buck-boost circuit is schematically described below. For example, referring to FIG. 5c, which is a schematic diagram of a circuit structure of a bidirectional buck-boost circuit provided in an embodiment of the application, the bidirectional conversion circuit 310 is configured as a bidirectional buck-boost circuit 313, and the bidirectional buck-boost circuit 313 includes an inductor L3 and switches S31 and S32, wherein the first end of the switch S31 is connected to the negative input terminal VIN- of the bidirectional conversion circuit 310, the first end of the switch S32 is connected to the positive output terminal VO+ of the bidirectional conversion circuit 310, the first end of the inductor L3 is connected to the second end of the switch S31 and the second end of the switch S32, respectively, and the second end of the inductor L3 is connected to the positive input terminal VIN+ and the negative output terminal VO- of the bidirectional conversion circuit 310, respectively. Alternatively, referring to FIG. 5d, which is another schematic diagram of a circuit structure of a bidirectional buck-boost circuit provided in an embodiment of the application, the bidirectional conversion circuit 310 is configured as a bidirectional buck-boost circuit 314, and the bidirectional buck-boost circuit 314 includes an inductor L4 and switches S41, S42, S43, and S44, wherein the first end of the switch S41 is connected to the positive input terminal VIN+ of the bidirectional conversion circuit 310, the first end of the switch S42 is connected to the negative input terminal VIN- of the bidirectional conversion circuit 310, the first end of the inductor L4 is connected to the second end of the switch S41 and the second end of the switch S42, respectively, the second end of the inductor L4 is connected to the second end of the switch S43 and the second end of the switch S43, respectively, the first end of the switch S43 is connected to the positive output terminal VO+ of the bidirectional conversion circuit 310, and the first end of the switch S44 is connected to the negative output terminal VO- of the bidirectional conversion circuit 310.

[0094] In some embodiments, the dual active full bridge circuit also has various topologies, and the 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 schematically described below. For example, referring to FIG. 5e, which is a schematic diagram of a circuit structure of a dual active full bridge circuit provided in an embodiment of the application, the bidirectional conversion circuit 310 is configured as a dual active full bridge circuit 315, which includes switches S51, S52, S53, S54, S55, S56, S57, S58, a capacitor CO, an inductor L5, and a transformer T, wherein the first end of the switch S51 and the first end of the switch S53 are both connected to the positive input terminal VIN+ of the bidirectional conversion circuit 310, the first end of the switch S52 and the first end of the switch S54 are both connected to the negative input terminal VIN- of the bidirectional conversion circuit 310, the second end of the switch S51 and the second end of the switch S53 are both connected to the first end of the capacitor CO, the second end of the capacitor CO is connected to the first end of the inductor L5, the second end of the inductor L5 is connected to the first end of the primary winding of the transformer T, and the second end of the switch S53 and the second end of the switch S54 are both connected to the second end of the primary winding of the transformer T. The first end of the switch S55 and the first end of the switch S57 are both connected to the positive output terminal VO+ of the bidirectional conversion circuit 310, the first end of the switch S56 and the first end of the switch S58 are both connected to the negative output terminal VO- of the bidirectional conversion circuit 310, the second end of the switch S55 and the second end of the switch S56 are both connected to the first end of the secondary winding of the transformer T, and the second end of the switch S57 and the second end of the switch S58 are both connected to the second end of the secondary winding of the transformer T.

[0095] Since the bidirectional conversion circuit 310 charges or discharges the storage capacitor CH when it is working, in order to avoid overvoltage or undervoltage of the storage capacitor CH and keep the voltage across the storage capacitor CH stable, the control circuit 330 can adjust the size and direction of the current i in of the input terminal of the bidirectional conversion circuit 310 according to the voltage u in and the current i ch across the storage capacitor CH, and the voltage u in at the input terminal of the bidirectional conversion circuit 310. For example, a voltage sampling unit and a current sampling unit can be provided in the power supply stabilizer 300, the voltage u in at the input terminal of the bidirectional conversion circuit 310 and the voltage u ch across the storage capacitor CH are collected by the voltage sampling unit, and the current i in at the input terminal of the bidirectional conversion circuit 310 is collected by the current sampling unit, and the voltages u in and u ch and the current i in are sent to the control circuit 330, and the control circuit 330 can adjust the size and direction of the current i in、u ch and the current i in , determine the magnitude and direction of the current to be controlled at the input end of the bidirectional conversion circuit 310, thereby controlling the current at the input end of the bidirectional conversion circuit 310 to follow the determined magnitude and direction. Further, the voltage sampling unit and the current sampling unit can be integrated with the control circuit and then set on the circuit board, or can also be set separately in different areas of the circuit board. In addition, the voltage sampling unit can also include a first voltage sampling unit and a second voltage sampling unit. The first voltage sampling unit collects the voltage u in , the second voltage sampling unit collects the voltage u ch .

[0096] It is understandable that the storage capacitor CH can be set to a capacitor with a high withstand voltage, so as to increase the energy in the bidirectional conversion circuit 310, significantly reduce the number of capacitors, and reduce cost and volume.

[0097] For example, referring to FIG4, when the energy storage unit 320 is a storage capacitor CH, the control parameters include the voltage u in and current i in , also includes the voltage u of the storage capacitor CH ch Based on this, the control circuit 330 can be adjusted according to the voltage u in , current i in And the voltage u ch , controls the operation of the bidirectional conversion circuit 310 and adjusts the current at the input end of the bidirectional conversion circuit 310. For example, the control circuit 330 can adjust the current at the input end of the bidirectional conversion circuit 310 according to the voltage u in , determine the current reference value i in_ref According to the voltage u of the storage capacitor CH ch , determine the current compensation value i in_rec Afterwards, according to the current reference value i in_ref and current compensation value i in_rec The sum (i in_ref +i in_rec ) and the current i at the input of the bidirectional conversion circuit 310 in The difference between in_ref +i in_rec -i in , adjusting the direction and magnitude of the current at the input end of the bidirectional conversion circuit 310. With this arrangement, the process of adjusting the direction and magnitude of the current at the input end of the bidirectional conversion circuit can be implemented.

[0098] In a specific implementation, the control circuit 330 can output a drive signal to the bidirectional conversion circuit 310, and control the on-off state of the switches in the bidirectional conversion circuit 310 (for example, switches S11 to S12 in the bidirectional boost circuit, or switches S21 to S22 in the bidirectional buck circuit, or switches S31, S32 or S41 to S44 in the bidirectional buck-boost circuit, or switches S51 to S58 in the dual active full-bridge circuit) through the drive signal to adjust the current i at the input end of the bidirectional conversion circuit 310. in The driving signal is a PWM signal, which has a switching frequency and a duty cycle. Therefore, the on-off state of the switch in the bidirectional conversion circuit 310 can be adjusted by adjusting the switching frequency and / or the duty cycle, thereby adjusting the direction and magnitude of the current at the input end of the bidirectional conversion circuit 310. Based on this, when the energy storage component is an energy storage capacitor, the control circuit 330 can adjust the voltage u in , current i in And the voltage u ch Determine the switching frequency and / or duty cycle of the driving signal, for example, based on the current reference value i in_ref and current compensation value i in_rec The sum (i in_ref +i in_rec ) and the current i at the input of the bidirectional conversion circuit in The difference between in_ref +i in_rec -i in , determine the switching frequency and / or duty cycle of the driving signal, output a new driving signal based on the determined switching frequency and / or duty cycle, thereby controlling the operation of the bidirectional conversion circuit 310 according to the new driving signal, and thereby achieving the current i at the input end of the bidirectional conversion circuit 310 in Adjustment of direction and size.

[0099] In specific implementation, it is determined that the voltage u in Whether it is in the reference voltage threshold interval [U0-ΔU1, U0+ΔU2] includes but is not limited to the following two ways.

[0100] The first method: the control circuit 330 collects the u collected by the voltage collection unit in Compare with U0-ΔU1 and U0+ΔU2 to directly determine u in Is the relationship between U0-ΔU1 less than, greater than or equal to U0-ΔU1? in Is the relationship with U0+ΔU2 less than, greater than or equal to.

[0101] The second method: the control circuit 330 receives the voltage u sent by the voltage acquisition unit. in The peak-to-peak value uppt (For example, the peak-to-peak value in the power frequency cycle) is compared with the peak-to-peak threshold range. If the peak-to-peak value u ppt In the peak-to-peak threshold range, the voltage u in Located in the reference voltage threshold range [U0-ΔU1, U0+ΔU2]. ppt If the peak-to-peak value threshold value is exceeded, the voltage u in It is not within the reference voltage threshold interval [U0-ΔU1, U0+ΔU2]. The peak-to-peak threshold interval can be determined according to the requirements of the actual application scenario and is not limited here.

[0102] The third method: the control circuit 330 receives the voltage u sent by the voltage acquisition unit in The instantaneous value and the average value u of the instantaneous value inz The difference between the two is compared with the difference threshold. If the difference is within the difference threshold range, the voltage u is determined to be in If the difference exceeds the threshold value interval, the voltage u in It is not within the reference voltage threshold interval [U0-ΔU1, U0+ΔU2]. The difference threshold can be determined according to the requirements of the actual application scenario and is not limited here.

[0103] It is understandable that the above judgment voltage u in The method of determining whether the voltage u is within the reference voltage threshold interval [U0-ΔU1, U0+ΔU2] is only for illustration. In actual applications, other methods can also be used to determine whether the voltage u is within the reference voltage threshold interval [U0-ΔU1, U0+ΔU2]. in Whether it is in the reference voltage threshold interval [U0-ΔU1, U0+ΔU2] is not specifically limited here.

[0104] Since the voltage u at the input end of the bidirectional conversion circuit 310 in Not in the reference voltage threshold interval [U0-ΔU1, U0+ΔU2], with u in >U0+ΔU2(i.e. voltage u in Greater than the upper limit of the reference voltage threshold range U0+ΔU2) and u in <U0-ΔU1(即电压u in There are two cases where the voltage is less than the lower limit U0-ΔU1 of the reference voltage threshold interval, and these two cases are explained below.

[0105] Case 1: Referring to Figures 3b, 3c and 4, if the voltage u in The oscillation difference (U in -U0) is positive and u in >U0+ΔU2, the control circuit 330 can obtain the control parameters (ie, the voltage uin , the current i in , the voltage u ch , the control circuit 330 controls the operation of the bidirectional conversion circuit 310, so that the current i in flows into the bidirectional conversion circuit 310, and the oscillation difference (i.e. U in -U0) is reduced, so as to achieve the purpose of stabilization, and realize the effect of suppressing the periodic oscillation of the voltage at the input end of the power supply device 120. Further, in the process of the current i in flowing into the bidirectional conversion circuit 310, for example, in the Z1 stage, the control circuit 330 controls the operation of the bidirectional conversion circuit 310, so that the size of the current i in flowing into the input end of the bidirectional conversion circuit 310 first increases and then decreases. In this way, the size of the current i in flowing into the input end of the bidirectional conversion circuit 310 changes along with the change of the voltage u in , so as to improve the stabilization effect of the voltage u in . It is worth mentioning that the current i in greater than 0 in FIG. 3a and FIG. 3b represents the current flowing into the input end of the bidirectional conversion circuit 310.

[0106] Further, in order to further improve the stabilization effect of the voltage u in , with reference to FIG. 3b and FIG. 3c, in a plurality of continuous different stages in which the oscillation difference (i.e. U in -U0) is positive, the maximum value of the current flowing into the input end of the bidirectional conversion circuit 310 is sequentially reduced. For example, with reference to FIG. 3b, i ma1 , i ma2 , i ma3 , i ma4 , i ma5 , i ma6 , i ma7 , i ma8 , i ma9 respectively represent the maximum value of the current flowing into the input end of the bidirectional conversion circuit 310 in a plurality of continuous different stages, and i ma1 , i ma2 , i ma3 , i ma4 , i ma5 , i ma6 , i ma7 , i ma8 , i ma9 are sequentially reduced. For example, with reference to FIG. 3c, i ma1 , i ma2 , i ma3 , i ma4 , i ma5 , ima6 , i ma7 , i ma8 , i ma9 , i ma10 , i ma11 , i ma12 respectively represent the maximum value of the current flowing into the input terminal of the bidirectional conversion circuit 310 in the continuous plurality of different stages, and the maximum value of the current flowing into the input terminal of the bidirectional conversion circuit 310 can be sequentially decreased. ma1 , i ma2 , i ma3 , i ma4 , i ma5 , i ma6 , i ma7 , i ma8 , i ma9 , i ma10 , i ma11 , i ma12 Further, the maximum value of the current flowing into the input terminal of the bidirectional conversion circuit 310 can be sequentially decreased by the same or different values in the continuous plurality of different stages in which the oscillation difference (i.e., U in -U0) is positive.

[0107] Exemplarily, when u in >U0+ΔU2, the control circuit 330 can determine the current reference value i in according to the voltage u in_ref , the direction of the current reference value i in_ref is positive, and the size of the current reference value i in_ref is i1. Further, the control circuit 330 can also obtain the current compensation value i ch_ref according to the capacitor voltage reference value c ch and the voltage u in_rec sent by the voltage sampling unit, the direction of the current compensation value i in_rec is positive or negative, and the size of the current compensation value i in_rec is i2. The current reference value i in_ref and the current compensation value i in_rec are added to obtain the current following value i in_s , and i in_s =i in_ref +i in_rec . Generally, i1 is greater than i2, for example, i1 is tens of amperes or hundreds of amperes, and i2 is several amperes, so i2 is much smaller than i1, the direction of the current following value i in_s is positive, and the size of the current following value i in_s is i1+i2 or i1-i2. Based on this, the control circuit 330 can further determine the size and direction of the current i in sent by the current sampling unit according to the current following value i in_sthe direction and size of the current i, and output a new drive signal to control the switch in the bidirectional conversion circuit 310 according to the new drive signal, so as to adjust the current flowing into the bidirectional conversion circuit 310 at the input end of the bidirectional conversion circuit 310, and the size of the current flowing into the bidirectional conversion circuit 310 is the current follow-up value i in_s the size of the current i, so as to realize the adjustment of the direction and size of the current i in the direction and size of the current i.

[0108] In some possible examples, the control circuit 330 can subtract the current i in_s sent by the current sampling unit from the current follow-up value i in , so as to obtain a current difference i in_s -i in . For some topologies of the bidirectional conversion circuit 310, if the current difference i in_s -i in is positive, the duty cycle is increased and the switching frequency is unchanged, or the switching frequency is increased and the duty cycle is unchanged, or the duty cycle and the switching frequency are both increased. If the current difference i in_s -i in is negative, the duty cycle is decreased and the switching frequency is unchanged, or the switching frequency is decreased and the duty cycle is unchanged, or the duty cycle and the switching frequency are both decreased. Based on this, a new drive signal can be output by controlling the topology of the part of the bidirectional conversion circuit 310. For other topologies of the bidirectional conversion circuit 310, if the current difference i in_s -i in is negative, the duty cycle is increased and the switching frequency is unchanged, or the switching frequency is increased and the duty cycle is unchanged, or the duty cycle and the switching frequency are both increased. If the current difference i in_s -i in is positive, the duty cycle is decreased and the switching frequency is unchanged, or the switching frequency is decreased and the duty cycle is unchanged, or the duty cycle and the switching frequency are both decreased. Based on this, a new drive signal can be output by controlling the topology of the part of the bidirectional conversion circuit 310.

[0109] The second case: referring to FIG. 6, FIG. 6 is another structure schematic diagram of the power stabilizing device provided by the embodiment of the application. In combination with FIG. 3b, FIG. 3c and FIG. 6, if the oscillation difference of the voltage u in (that is, U in -U0) is a negative value and u in <U0-ΔU1, the control circuit 330 can control the bidirectional conversion circuit 310 to work according to the obtained control parameters (that is, the voltage u in , the current i in , and the voltage u ch ), so as to make the current iin The current i in out of the bidirectional conversion circuit 310 is reduced to achieve the purpose of stabilization, and to achieve the effect of suppressing the periodic oscillation of the voltage at the input of the power supply device 120. Further, during the process of the current i in out of the bidirectional conversion circuit 310, for example, in the stage Z2, the control circuit 330 controls the bidirectional conversion circuit 310 to work, and can also make the current i in out of the bidirectional conversion circuit 310 first increase and then decrease. In this way, the current i in out of the bidirectional conversion circuit 310 can change following the change of the voltage u in , and the stabilization effect of the voltage u in is improved. It is worth mentioning that the current i in less than 0 in FIG. 3a and FIG. 3b represents the current out of the input of the bidirectional conversion circuit 310.

[0110] Further, in order to further improve the stabilization effect of the voltage u in , with reference to FIG. 3b and FIG. 3c, the maximum value of the current out of the input of the bidirectional conversion circuit 310 is sequentially reduced in the continuous multiple different stages of the oscillation difference (i.e. U in -U0) being negative. For example, with reference to FIG. 3b, i mi1 , i mi2 , i mi3 , i mi4 , i mi5 , i mi6 , i mi7 , i mi8 , i mi9 respectively represent the maximum value of the current out of the input of the bidirectional conversion circuit 310 in the continuous multiple different stages, and i mi1 , i mi2 , i mi3 , i mi4 , i mi5 , i mi6 , i mi7 , i mi8 , i mi9 are sequentially reduced. For example, with reference to FIG. 3c, i mi1 , i mi2 , i mi3 , i mi4 , i mi5 , i mi6 , i mi7 , i mi8 , i mi9 , i mi10 , i mi11, i mi12 respectively represent the maximum value of the current flowing out of the input terminal of the bidirectional conversion circuit 310 in a plurality of continuous different stages, and the maximum value of the current flowing out of the input terminal of the bidirectional conversion circuit 310 can be sequentially decreased. mi1 , i mi2 , i mi3 , i mi4 , i mi5 , i mi6 , i mi7 , i m8 , i mi9 , i mi10 , i mi11 , i mi12 Further, the maximum value of the current flowing out of the input terminal of the bidirectional conversion circuit 310 can be sequentially decreased by the same or different values in a plurality of continuous different stages when the oscillation difference (i.e., U in -U0) is negative.

[0111] For example, when u in <U0-ΔU1, the control circuit 330 can determine the current reference value i in according to the voltage u in_ref , the current reference value i in_ref has a negative direction and the magnitude of i in_ref is i3. In addition, the control circuit 330 can also obtain the current compensation value i ch_ref according to the capacitor voltage reference value c ch and the voltage u in_rec sent by the voltage sampling unit, the current compensation value i in_rec has a positive or negative direction and the magnitude of i in_rec is i4. The current reference value i in_ref and the current compensation value i in_rec are added to obtain the current following value i in_s , and i in_s =i in_ref +i in_rec . Generally, i3 is greater than i4, for example, i3 is tens of amperes or hundreds of amperes, and i4 is several amperes, so i4 is much smaller than i3, the direction of the current following value i in_s is negative, and the magnitude of the current following value i in_s is i3+i4 or i3-i4. Based on this, the control circuit 330 can further determine the current i in sent by the current sampling unit according to the magnitude and direction of the current i in_sThe magnitude and direction of the driving signal are determined, so that the switching frequency and / or duty cycle of the driving signal can be further determined, and a new driving signal is output, so that the bidirectional conversion circuit 310 is controlled to work according to the new driving signal, and the direction of the current at the input end of the bidirectional conversion circuit 310 is adjusted to be negative, and the magnitude of the current at the input end of the bidirectional conversion circuit 310 is adjusted to be a second target value, and the second target value is the current following value i in_s The size of the input current i of the bidirectional conversion circuit 310 is realized. in Adjustment of direction and size.

[0112] In some possible examples, the control circuit 330 can set the current following value i in_s Subtract the current i sent by the current sampling unit in , get the current difference i in_s -i in For some topologies of the bidirectional conversion circuit 310, if the current difference i in_s -i in If the current difference i is positive, then the duty cycle is increased and the switching frequency remains unchanged, or the switching frequency is increased and the duty cycle remains unchanged, or the duty cycle and switching frequency are increased. in_s -i in If the current difference i is negative, the duty cycle is reduced and the switching frequency remains unchanged, or the switching frequency is reduced and the duty cycle remains unchanged, or the duty cycle and the switching frequency are reduced. Based on this, the topology of the bidirectional conversion circuit 310 can be controlled to output a new drive signal. For other topologies of the bidirectional conversion circuit 310, if the current difference i in_s -i in If the current difference i is negative, then the duty cycle is increased and the switching frequency remains unchanged, or the switching frequency is increased and the duty cycle remains unchanged, or the duty cycle and switching frequency are increased. in_s -i in If is positive, the duty cycle is reduced while the switching frequency remains unchanged, or the switching frequency is reduced while the duty cycle remains unchanged, or both the duty cycle and the switching frequency are reduced. Based on this, the topology of the bidirectional conversion circuit 310 can be controlled to output a new drive signal.

[0113] FIG7 is another structural diagram of a power stabilization device provided in an embodiment of the present application. The power stabilization device in this embodiment is a modification of the power stabilization device in the above embodiment. The similarities are not repeated here. The difference is that: the energy storage component 320 includes an energy storage battery BA, and the control parameter includes the voltage u at the input end of the bidirectional conversion circuit 310. in and current i in Furthermore, the control circuit 330 can control the voltage u at the input end of the bidirectional conversion circuit 310. in The oscillation difference (i.e. u inswitches between positive and negative values, and the voltage u in When the voltage u in at the input of the bidirectional conversion circuit 310 is not located in the reference voltage threshold interval [U0-ΔU1, U0+ΔU2], the control circuit 330 adjusts the magnitude and direction of the current at the input of the bidirectional conversion circuit 310 according to the voltage u in and the current i in Thus, the voltage across the energy storage battery BA is stable, and the under-voltage or over-voltage phenomenon can be avoided, so that the voltage u in and the current i in at the input of the bidirectional conversion circuit 310 can be directly used to adjust the magnitude and direction of the current at the input of the bidirectional conversion circuit 310.

[0114] The voltage sampling unit can collect the voltage u in and send the collected voltage u in to the control circuit 330. The current sampling unit can collect the current i in and send the collected current i in to the control circuit 330. The control circuit 330 can determine the current reference value i in_ref according to the voltage u in_ref at the input of the bidirectional conversion circuit 310. The control circuit 330 adjusts the direction and magnitude of the current at the input of the bidirectional conversion circuit 310 according to the difference i in between the current reference value i in_ref and the current i in at the input of the bidirectional conversion circuit 310. Thus, the process of adjusting the direction and magnitude of the current at the input of the bidirectional conversion circuit 310 can be realized.

[0115] When the oscillation difference (i.e., u in -u0) of the voltage u in is positive and u in >U0+ΔU2, referring to FIGS. 3b, 3c and 7, the control circuit 330 can make the current i in at the input of the bidirectional conversion circuit 310 flow into the bidirectional conversion circuit 310 according to the voltage u in and the current i in obtained, so as to reduce the oscillation difference (i.e., U in -U0), thereby achieving the purpose of stabilization and realizing the effect of suppressing the periodic oscillation of the voltage at the input of the power supply device 120. Further, in the process of making the current i in at the input of the bidirectional conversion circuit 310 flow into the bidirectional conversion circuit 310, for example, in the Z1 stage, the control circuit 330 controls the bidirectional conversion circuit 310 to work, which can also make the current i inincreases and then decreases. This can make the current i in follows the change of the voltage u in , and improve the voltage u in stabilization effect.

[0116] Further, in order to further improve the voltage u in stabilization effect, referring to Fig. 3b and Fig. 3c, the maximum value of the current flowing into the input end of the bidirectional conversion circuit 310 in a plurality of continuous different stages with positive oscillation difference (i.e. U in -U0) decreases in turn. For example, referring to Fig. 3b, i ma1 , i ma2 , i ma3 , i ma4 , i ma5 , i ma6 , i ma7 , i ma8 , i ma9 respectively represent the maximum value of the current flowing into the input end of the bidirectional conversion circuit 310 in a plurality of continuous different stages, which can make i ma1 , i ma2 , i ma3 , i ma4 , i ma5 , i ma6 , i ma7 , i ma8 , i ma9 decrease in turn. For example, referring to Fig. 3c, i ma1 , i ma2 , i ma3 , i ma4 , i ma5 , i ma6 , i ma7 , i ma8 , i ma9 , i ma10 , i ma11 , i ma12 respectively represent the maximum value of the current flowing into the input end of the bidirectional conversion circuit 310 in a plurality of continuous 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 , i ma12 decrease in turn. Further, the maximum value of the current flowing into the input end of the bidirectional conversion circuit 310 in a plurality of continuous different stages with positive oscillation difference (i.e. Uin -U0) is a positive value, the maximum value of the current flowing into the input terminal of the bidirectional conversion circuit 310 is sequentially reduced by the same or different value in a plurality of different stages.

[0117] Exemplarily, the control circuit 330 reduces the value of u in >U0+ΔU2, the current reference value i in is determined according to the voltage u in_ref The direction of the current reference value i in_ref is positive, and the size of i in_ref is i1. Based on this, the control circuit 330 further determines the switching frequency and / or duty cycle of the driving signal according to the size and direction of the current i in sent by the current sampling unit and the size and direction of the current reference value i in_ref , for example, according to the difference i in_ref -i in , so as to output a new driving signal according to the more determined switching frequency and / or duty cycle, so as to control the bidirectional conversion circuit 310 to work according to the new driving signal, adjust the current flowing into the bidirectional conversion circuit 310 at the input terminal of the bidirectional conversion circuit 310, and adjust the size of the current flowing into the input terminal of the bidirectional conversion circuit 310 to be the size of the current reference value i in_ref , thereby realizing the adjustment of the direction and size of the current i in at the input terminal of the bidirectional conversion circuit 310. In addition, the process of determining the switching frequency and / or duty cycle can refer to the above description, which will not be repeated here.

[0118] For the oscillation difference of the voltage u in , that is, u in -U0) is a negative value and u in <U0-ΔU1, referring to FIGS. 3b, 3c and 7, the control circuit 330 can control the bidirectional conversion circuit 310 to work according to the obtained voltage u in and current i in , so that the current i in at the input terminal of the bidirectional conversion circuit 310 flows out of the bidirectional conversion circuit 310, so as to reduce the absolute value of the oscillation difference (i.e. U in -U0), thereby achieving the purpose of stability and realizing the effect of suppressing the periodic oscillation of the voltage at the input terminal of the power supply device 120. Further, in the process of the current i in at the input terminal of the bidirectional conversion circuit 310 flowing out of the bidirectional conversion circuit 310, for example, in the Z2 stage, the control circuit 330 controls the bidirectional conversion circuit 310 to work, so that the size of the current i in flowing out of the input terminal of the bidirectional conversion circuit 310 first increases and then decreases. In this way, the current iin The size follows the voltage u in The change of the voltage u in It is worth mentioning that the current i less than 0 in Figure 3a and Figure 3b in represents the current flowing out of the input terminal of the bidirectional conversion circuit 310 .

[0119] Furthermore, in order to further increase the voltage u in Stable effect, refer to Figure 3b and Figure 3c, in the oscillation difference (ie U in -U0) is a negative value in a plurality of consecutive different stages, the maximum value of the current flowing out of the input end of the bidirectional conversion circuit 310 decreases successively. mi1 、i mi2 、i mi3 、i mi4 、i mi5 、i mi6 、i mi7 、i mi8 、i mi9 They represent the maximum value of the current flowing out of the input terminal of the bidirectional conversion circuit 310 in a plurality of different stages, which can make i mi1 、i mi2 、i mi3 、i mi4 、i mi5 、i mi6 、i mi7 、i mi8 、i mi9 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 、i mi12 They represent the maximum value of the current flowing out of the input terminal of the bidirectional conversion circuit 310 in a plurality of 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 、i mi12Furthermore, the oscillation difference (U in In a plurality of consecutive different stages where f is a negative value, the maximum value of the current flowing out of the input terminal of the bidirectional conversion circuit 310 is successively reduced by the same or different values.

[0120] For example, the control circuit 330 in <U0-ΔU1时,可以根据电压u in Determine the current reference value i in_ref , the current reference value i in_ref The direction is negative, and i in_ref The size of is i3. Based on this, the control circuit 330 then calculates the current i sent by the current sampling unit. in The magnitude and direction of the current reference value i in_ref The size and direction of, for example, the difference i in_ref -i in , determining the switching frequency and / or duty cycle of the driving signal, thereby being able to more accurately determine the switching frequency and / or duty cycle, outputting a new driving signal, thereby controlling the operation of the bidirectional conversion circuit 310 according to the new driving signal, adjusting the current at the input end of the bidirectional conversion circuit 310 to flow out of the bidirectional conversion circuit 310, and adjusting the current flowing out of the input end of the bidirectional conversion circuit 310 to be the current following value i in_s The size of the input current i of the bidirectional conversion circuit 310 is realized. in Adjustment of direction and size.

[0121] In some embodiments of the present application, a power stabilization device may be integrated into a power supply device. For example, refer to Figure 8, which is a schematic diagram of the structure of a power supply device provided in an embodiment of the present application. The power supply device 120 includes not only a voltage conversion circuit but also a power stabilization device 300 in an embodiment of the present application. The input of the voltage conversion circuit is used to receive direct current (DC) power, and the output of the voltage conversion circuit is used to connect to a power-consuming device. The voltage conversion circuit is used to convert the DC power and output it to the power-consuming device. Furthermore, the input of the power stabilization device 300 is connected in parallel with the input of the voltage conversion circuit, and the power stabilization device 300 stabilizes the voltage at the input of the voltage conversion circuit. It is understood that one or more power stabilization devices 300 may be provided in the power supply device, and this is not limited here. Furthermore, the power supply device in the present application may include one or more power supply devices with integrated power stabilization devices. It is understood that all power supply devices in the power supply device may be provided with the power stabilization device in the present application, or a portion of the power supply devices may be provided with the power stabilization device in the present application, while the remaining portion of the power supply devices may not be provided with the power stabilization device in the present application.

[0122] In some embodiments of the present application, the power stabilizing device can be arranged outside the power supply device, and the power stabilizing device can be connected with the power supply device to achieve the purpose of stabilization, so that the power supply device to be stabilized does not need to be redesigned. For example, referring to FIG. 9, FIG. 9 is another structural schematic diagram of a power supply device provided by an embodiment of the present application. The power supply device includes one or more power supply devices 120 and one or more power stabilizing devices 300. The input terminals of the power supply devices 120 are connected in parallel with each other, for example, the input terminals of the power supply devices 120 are connected in parallel with the wires (Aus+, Aus-) respectively, the output terminals of the power supply devices 120 are used to connect the power consuming device 200, and the input terminals of the power stabilizing device 300 are connected in parallel with the input terminals of the voltage conversion circuit, for example, the input terminals of the power stabilizing device 300 are connected in parallel with the wires (Aus+, Aus-) respectively, and the voltage of the input terminals of the voltage conversion circuit is stabilized by the power stabilizing device 300.

[0123] An embodiment of the present application further provides a communication device, which includes a power consuming device and a power supply device, wherein the output terminal of the power supply device is connected with the power consuming device.

[0124] Based on this, an embodiment of the present application further provides a voltage control method, which is applied to a power stabilizing device. The power stabilizing device includes a bidirectional conversion circuit, a control circuit and an energy storage component. The input terminal of the bidirectional conversion circuit is used to be connected in parallel with the input terminal of a power supply device, and the output terminal of the bidirectional conversion circuit is connected with the energy storage component. The method includes the following steps: in response to the oscillation difference switching between a positive value and a negative value and the voltage of the input terminal of the bidirectional conversion circuit not being located in the reference voltage threshold interval, the control circuit controls the bidirectional conversion circuit to work based on control parameters, adjusts the current of the input terminal of the bidirectional conversion circuit, and makes the voltage of the input terminal of the bidirectional conversion circuit located in the reference voltage threshold interval. The control parameters at least include the current and the voltage of the input terminal of the bidirectional conversion circuit. The oscillation difference is the difference between the voltage of the input terminal of the bidirectional conversion circuit and a reference voltage, and the reference voltage is the voltage of the input terminal of the input power supply device.

[0125] In some embodiments, in response to the oscillation difference switching between a positive value and a negative value and the voltage of the input terminal of the bidirectional conversion circuit not being located in the reference voltage threshold interval, the control circuit controls the bidirectional conversion circuit to work based on the control parameters to adjust the current of the input terminal of the bidirectional conversion circuit, which can include the following process: in response to the oscillation difference being a positive value and the voltage of the input terminal of the bidirectional conversion circuit being greater than the upper limit of the reference voltage threshold interval, the control circuit controls the bidirectional conversion circuit to work based on the control parameters to make the current of the input terminal of the bidirectional conversion circuit flow into the bidirectional conversion circuit in a positive direction.

[0126] In some embodiments, in the same phase in which the oscillation difference is positive, the oscillation difference first increases and then decreases. And, in the process in which the current at the input end of the bidirectional conversion circuit flows into the bidirectional conversion circuit, the size of the current flowing into the input end of the bidirectional conversion circuit first increases and then decreases.

[0127] In some embodiments, in a plurality of different phases in which the oscillation difference is positive, the maximum value of the oscillation difference decreases successively, and the maximum value of the size of the current flowing into the input end of the bidirectional conversion circuit decreases successively.

[0128] In some embodiments, in response to the oscillation difference switching between positive and negative values and the voltage at the input end of the bidirectional conversion circuit not being located in the reference voltage threshold interval, the control circuit controls the bidirectional conversion circuit to work based on the control parameter and adjusts the current at the input end of the bidirectional conversion circuit, which can include the following process: in response to the oscillation difference being negative and the voltage at the input end of the bidirectional conversion circuit being less than the lower limit of the reference voltage threshold interval, the control circuit controls the bidirectional conversion circuit to work based on the control parameter, so that the current at the input end of the bidirectional conversion circuit flows out of the bidirectional conversion circuit reversely.

[0129] In some embodiments, in the same phase in which the oscillation difference is negative, the oscillation difference first decreases and then increases. In the process in which the current at the input end of the bidirectional conversion circuit flows out of the bidirectional conversion circuit reversely, the size of the current flowing out of the input end of the bidirectional conversion circuit first increases and then decreases.

[0130] In some embodiments, in a plurality of different phases in which the oscillation difference is negative, the minimum value of the oscillation difference increases successively, and the maximum value of the size of the current flowing out of the input end of the bidirectional conversion circuit decreases successively.

[0131] In some embodiments, the energy storage component includes a storage capacitor, and the control parameter further includes the voltage of the storage capacitor. And, the control of the bidirectional conversion circuit to work can include the following process: the control circuit outputs a driving signal to the bidirectional conversion circuit; wherein the duty ratio or switching frequency of the driving signal is determined according to the voltage and current at the input end of the bidirectional conversion circuit and the voltage of the storage capacitor.

[0132] In some embodiments, the determination of the duty ratio or switching frequency of the driving signal according to the voltage and current at the input end of the bidirectional conversion circuit and the voltage of the storage capacitor can specifically include the following process: determining a current reference value according to the voltage at the input end of the bidirectional conversion circuit. Determining a current compensation value according to the voltage of the storage capacitor. Determining the duty ratio or switching frequency of the driving signal according to the difference between the sum of the current reference value and the current compensation value and the current at the input end of the bidirectional conversion circuit.

[0133] In some embodiments, the energy storage component comprises an energy storage battery. And, the controlling the bidirectional conversion circuit to work can comprise the following process: the control circuit outputs a driving signal to the bidirectional conversion circuit; wherein the duty cycle or switching frequency of the driving signal is determined according to the voltage and current at the input terminal of the bidirectional conversion circuit.

[0134] In some embodiments, the duty cycle or switching frequency of the driving signal is determined according to the voltage and current at the input terminal of the bidirectional conversion circuit, which can specifically comprise the following process: determining a current reference value according to the voltage at the input terminal of the bidirectional conversion circuit; and determining the duty cycle or switching frequency of the driving signal according to the difference between the current reference value and the current at the input terminal of the bidirectional conversion circuit.

[0135] In some embodiments, the method further comprises: in response to the voltage at the input terminal of the bidirectional conversion circuit being within a reference voltage threshold interval, the control circuit controls the bidirectional conversion circuit to stop working.

[0136] The above merely provides a specific implementation of the present application, but the protection scope of the present application is not limited thereto, any person skilled in the art can easily think of changes or replacements within the technical scope disclosed by the present application, which shall be encompassed within the protection scope of the present application.

Claims

1. A voltage control method, characterized in that: The method is applied to a power supply stabilization device, which includes a bidirectional conversion circuit, a control circuit, and an energy storage component. The input end of the bidirectional conversion circuit is connected in parallel with the input end of the power supply device, and the output end of the bidirectional conversion circuit is connected to the energy storage component. The method comprises: In response to the oscillation difference switching between a positive value and a negative value and the voltage at the input terminal of the bidirectional conversion circuit not being within a reference voltage threshold interval, the control circuit controls the operation of the bidirectional conversion circuit based on control parameters, and adjusts the current at the input terminal of the bidirectional conversion circuit so that the voltage at the input terminal of the bidirectional conversion circuit is within the reference voltage threshold interval, wherein the control parameters include at least the current and voltage at the input terminal of the bidirectional conversion circuit; The oscillation difference is a difference between a voltage at an input terminal of the bidirectional conversion circuit and a reference voltage, and the reference voltage is a voltage input to an input terminal of the power supply device.

2. The voltage control method according to claim 1, wherein: In response to the oscillation difference switching between a positive value and a negative value and the voltage at the input terminal of the bidirectional conversion circuit not being within a reference voltage threshold interval, the control circuit controlling the operation of the bidirectional conversion circuit based on a control parameter and adjusting the current at the input terminal of the bidirectional conversion circuit includes: In response to the oscillation difference being a positive value and the voltage at the input end of the bidirectional conversion circuit being greater than the upper limit of the reference voltage threshold interval, the control circuit controls the operation of the bidirectional conversion circuit based on the control parameter so that the current at the input end of the bidirectional conversion circuit flows in a positive direction into the bidirectional conversion circuit.

3. The voltage control method according to claim 2, wherein: In the same stage where the oscillation difference is a positive value, the oscillation difference first increases and then decreases; In the process in which the current at the input end of the bidirectional conversion circuit flows forward into the bidirectional conversion circuit, the magnitude of the current flowing into the input end of the bidirectional conversion circuit first increases and then decreases.

4. The voltage control method according to claim 2 or 3, wherein: In a plurality of consecutive different stages in which the oscillation difference is a positive value, the maximum value of the oscillation difference decreases successively, and the maximum value of the current flowing into the input end of the bidirectional conversion circuit decreases successively.

5. The voltage control method according to any one of claims 1 to 4, wherein: In response to the oscillation difference switching between a positive value and a negative value and the voltage at the input terminal of the bidirectional conversion circuit not being within a reference voltage threshold interval, the control circuit controlling the operation of the bidirectional conversion circuit based on a control parameter and adjusting the current at the input terminal of the bidirectional conversion circuit includes: In response to the oscillation difference being a negative value and the voltage at the input end of the bidirectional conversion circuit being less than the lower limit of the reference voltage threshold interval, the control circuit controls the operation of the bidirectional conversion circuit based on the control parameter, so that the current at the input end of the bidirectional conversion circuit flows out of the bidirectional conversion circuit in the reverse direction.

6. The voltage control method according to claim 5, wherein: In the same stage where the oscillation difference is a negative value, the oscillation difference first decreases and then increases; In the process of the current at the input end of the bidirectional conversion circuit flowing out of the bidirectional conversion circuit in reverse, the magnitude of the current flowing out of the input end of the bidirectional conversion circuit first increases and then decreases.

7. The voltage control method according to claim 5 or 6, characterized in that: In a plurality of consecutive different stages in which the oscillation difference is a negative value, the minimum value of the oscillation difference increases successively, and the maximum value of the current flowing out of the input end of the bidirectional conversion circuit decreases successively.

8. The voltage control method according to any one of claims 1 to 7, wherein: The energy storage component includes a storage capacitor; The control parameters also include: the voltage of the storage capacitor; The control circuit controls the operation of the bidirectional conversion circuit based on the control parameters, including: A drive signal is output to the bidirectional conversion circuit; wherein the duty cycle or switching frequency of the drive signal is determined based on the voltage and current at the input end of the bidirectional conversion circuit and the voltage of the storage capacitor.

9. The voltage control method according to claim 8, wherein: The duty cycle or switching frequency of the driving signal is determined based on the voltage and current at the input end of the bidirectional conversion circuit and the voltage of the storage capacitor, specifically including: determining a current reference value based on a voltage at an input terminal of the bidirectional conversion circuit; determining a current compensation value based on the voltage of the storage capacitor; The duty cycle or switching frequency of the driving signal is determined based on a difference between a sum of the current reference value and the current compensation value and a current at an input terminal of the bidirectional conversion circuit.

10. The voltage control method according to any one of claims 1 to 7, wherein: The energy storage component includes an energy storage battery; The control circuit controls the operation of the bidirectional conversion circuit based on the control parameters, including: A drive signal is output to the bidirectional conversion circuit; wherein a duty cycle or a switching frequency of the drive signal is determined based on a voltage and a current at an input terminal of the bidirectional conversion circuit.

11. The voltage control method according to claim 10, wherein: The duty cycle or switching frequency of the driving signal is determined based on the voltage and current at the input end of the bidirectional conversion circuit, specifically including: determining a current reference value based on a voltage at an input terminal of the bidirectional conversion circuit; The duty cycle or switching frequency of the driving signal is determined based on a difference between the current reference value and the current at the input terminal of the bidirectional conversion circuit.

12. The voltage control method according to any one of claims 1 to 11, wherein: The method further comprises: In response to the voltage at the input terminal of the bidirectional conversion circuit being within the reference voltage threshold interval, the control circuit controls the bidirectional conversion circuit to stop operating.

13. A power stabilization device, characterized in that: include: Bidirectional conversion circuit, energy storage components and control circuit; The input end of the bidirectional conversion circuit is connected in parallel with the input end of the power supply device, and the output end of the bidirectional conversion circuit is connected to the energy storage component; The control circuit is configured to: in response to the oscillation difference switching between a positive value and a negative value and the voltage at the input terminal of the bidirectional conversion circuit not being within a reference voltage threshold interval, control the operation of the bidirectional conversion circuit based on the control parameters, and adjust the current at the input terminal of the bidirectional conversion circuit so that the voltage at the input terminal of the bidirectional conversion circuit is within the reference voltage threshold interval, wherein the control parameters include at least the current and voltage at the input terminal of the bidirectional conversion circuit; The oscillation difference is a difference between a voltage at an input terminal of the bidirectional conversion circuit and a reference voltage, and the reference voltage is a voltage input to an input terminal of the power supply device.

14. The power stabilizing device according to claim 13, wherein: The power stabilization device further includes: a voltage stabilizing capacitor, which is connected in parallel to the input end of the bidirectional conversion circuit.

15. The power stabilizing device according to claim 13 or 14, wherein: The bidirectional conversion circuit is at least one of the following circuit types: a bidirectional boost circuit, a bidirectional buck circuit, a bidirectional buck-boost circuit, or a dual active full-bridge circuit.

16. A power supply device, characterized in that: include: A voltage conversion circuit and a power stabilization device according to any one of claims 13 to 15; The input end of the voltage conversion circuit is used to receive direct current, the output end of the voltage conversion circuit is used to connect to an electric device, and the voltage conversion circuit is used to convert the direct current and output it to the electric device; The input end of the power stabilization device is connected in parallel with the input end of the voltage conversion circuit.

17. A power supply device, characterized in that: Comprising one or more power supply devices as claimed in claim 16.

18. A power supply device, characterized in that: include: One or more power supply devices, and one or more power stabilization devices according to any one of claims 13 to 15; The input ends of the power supply devices are connected in parallel, and the output ends of the power supply devices are connected to the power-consuming devices. The power supply devices are used to convert direct current and output it to the power-consuming devices. The input end of the power stabilizing device is connected in parallel with the input end of the voltage conversion circuit, and the power stabilizing device is used to stabilize the voltage of the input end of the voltage conversion circuit.

19. A communication device, characterized in that: It comprises an electric device and the power supply device as claimed in claim 17 or 18, wherein the output end of the power supply device is connected to the electric device.

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