A direct current power supply output ripple suppression method and system

Abstract

The application discloses a direct-current power supply output ripple suppression method and system, and relates to the field of communication power supply, and comprises the following steps: obtaining a port pair through pairing; obtaining a backflow charge quantity; inverting the current into a disturbed output port according to the derivative of the backflow charge quantity and the ratio of the reverse injection current formed by the disturbance output port voltage disturbance to the port current disturbance in a current inversion interval; obtaining a branch compensation current and a common backflow compensation current according to the derivative of the backflow charge quantity, the reverse injection current and the current, and loading the branch compensation current and the common backflow compensation current into corresponding compensation positions; and the application is favorable for reducing the ripple transfer risk among multiple output ports and improving the communication power supply stability.

Description

Technical Field

[0001] This invention relates to the field of communication power supplies, and more specifically to a method and system for suppressing DC power supply output ripple. Background Technology

[0002] As communication equipment becomes increasingly integrated and its load density increases, DC power supply systems typically need to provide continuous power to multiple functional loads simultaneously. During the switching of operating states, power regulation, and periodic operation of different loads, transient changes in port current occur and are conducted through the power supply loop to the system's common electrical path. Due to coupling factors such as common return current, common impedance, and decoupling energy storage components among the load branches, ripple disturbances generated in one branch are not limited to that branch but are transmitted and superimposed across multiple output ports, thus affecting the power supply quality and operational reliability of the communication equipment.

[0003] Existing DC power supply ripple suppression schemes mostly focus on ripple sampling, filtering, feedback regulation, or reverse compensation at a single output port, typically aiming to reduce the output ripple at that port. While these schemes are applicable to single-load conditions, in power supply structures with multiple output ports sharing a return path, single-end compensation alters the current distribution in the common path, causing the compensation current to flow through the shared electrical path to other load ports, resulting in cross-port ripple transfer. Existing schemes lack correlation analysis of the sources of disturbance, affected objects, and changes in the common return charge among multiple ports, making it difficult to simultaneously suppress ripple at the source port and control the power supply ripple at the affected port. Summary of the Invention

[0004] The purpose of this invention is to provide a method and system for suppressing DC power supply output ripple, so as to solve the problems in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] In a first aspect, the present invention provides a DC power supply output ripple suppression method, applied to a communication DC power supply system in which multiple output ports share the same common return path, comprising:

[0007] Small-signal electrical parameters are acquired within a sampling window covering one ripple cycle. Port pairs are obtained by matching the sign and absolute value of the half-cycle integral of the product of the port current disturbance and the common return path voltage disturbance. The port pairs are then output from the disturbance port. and the disturbed output port constitute;

[0008] Disturbed output port For the object, the return charge is obtained by integrating the difference between the decoupling capacitor current and the equivalent admittance current of the common return path. ;

[0009] Within the current inversion range, the reverse injection current is generated by the disturbance of the output port voltage. The ratio relative to the port current disturbance and the amount of return charge. The derivative is used to invert the output at the disturbed port. current ;

[0010] Based on reverse injection current Current and return charge The derivative of the derivative is used to obtain the branch compensation current. and common return current compensation And load it into the corresponding compensation location.

[0011] Secondly, the present invention provides a DC power supply output ripple suppression system, implemented based on the method described above, comprising:

[0012] The pairing module is used to acquire small-signal electrical parameters within a sampling window covering one ripple cycle, and to obtain port pairs based on the sign and absolute value of the half-cycle integral of the product of the port current disturbance and the common return path voltage disturbance. These port pairs are then output from the disturbance port. and the disturbed output port constitute;

[0013] Charge module, used for output port under disturbance For the object, the return charge is obtained by integrating the difference between the decoupling capacitor current and the equivalent admittance current of the common return path. ;

[0014] The inversion module is used to, within the current inversion range, inject the current in the reverse direction based on the voltage disturbance at the perturbation output port. The ratio relative to the port current disturbance and the amount of return charge. The derivative is used to invert the output at the disturbed port. current ;

[0015] Compensation module, used to adjust based on reverse injection current Current and return charge The derivative of the derivative is used to obtain the branch compensation current. and common return current compensation And load it into the corresponding compensation location.

[0016] The technical effects and advantages provided by the present invention in the above technical solution are as follows:

[0017] This invention pairs the disturbed output port and the disturbed output port by using the half-cycle integral relationship between port current disturbance and common return path voltage disturbance, thus expanding the ripple suppression target from a single port to a pair of ports with electrical coupling, which is beneficial for identifying cross-port disturbance propagation paths in multi-output power supply structures.

[0018] Furthermore, this invention obtains the amount of return charge by integrating the difference between the decoupling capacitor current and the equivalent admittance current of the common return path, so that the ripple change at the disturbed output port can correspond to the charge migration process in the common return path, which helps to reduce the control deviation caused by compensating only based on the ripple amplitude of this terminal.

[0019] In addition, the present invention inverts the current entering the disturbed output port and generates branch compensation current and common return current compensation current accordingly, so that the disturbance port compensation and common return path compensation are performed in coordination within the same ripple period, which helps to reduce cross-port ripple transfer caused by single-ended compensation. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0021] Figure 1 A schematic flowchart of a DC power supply output ripple suppression method provided in an embodiment of the present invention;

[0022] Figure 2 A schematic diagram of a communication DC power supply system provided in an embodiment of the present invention;

[0023] Figure 3 This is a schematic diagram of a DC power supply output ripple suppression system provided in an embodiment of the present invention. Detailed Implementation

[0024] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the examples set forth herein; rather, they are provided to make the description of this application more complete and comprehensive, and to fully convey the concept of the exemplary embodiments to those skilled in the art. The drawings are merely illustrative illustrations of this application and are not necessarily drawn to scale. The same reference numerals in the drawings denote the same or similar parts, and therefore repeated descriptions of them will be omitted.

[0025] Furthermore, the described features, structures, or characteristics can be combined in any suitable manner in one or more exemplary embodiments. Numerous specific details are provided in the following description to give a full understanding of the exemplary embodiments disclosed in this application. However, those skilled in the art will recognize that the technical solutions disclosed in this application can be practiced with one or more specific details omitted, or other methods, components, steps, etc., can be employed. In other instances, well-known structures, methods, implementations, or operations are not shown or described in detail to avoid obscuring various aspects of the disclosure of this application.

[0026] Example 1

[0027] like Figure 1 As shown, this embodiment discloses a DC power supply output ripple suppression method, applied to a communication DC power supply system with multiple output ports sharing the same common return path, including:

[0028] like Figure 2 As shown, the communication DC power supply system includes a DC power input side, a DC-DC converter circuit, multiple output ports, multiple load branches, a common return path, a decoupling capacitor, a digital controller, a branch current injection circuit, and a return current injection circuit. The multiple output ports provide DC power to their respective load branches, and the return sides of the multiple load branches are connected to a DC negative terminal reference point via the same common return path. The decoupling capacitor is connected between the corresponding output port and the reference potential to handle transient charge changes at the corresponding output port. The common return path is the conductive path through which the return currents of the multiple output ports pass, and it has an equivalent impedance related to conductor impedance, connection impedance, and return current distribution. When a current step, pulse absorption, or periodic current disturbance occurs at any output port corresponding to its load, the port current disturbance generated by that output port forms a common return path voltage disturbance on the common return path, which then affects the port voltage ripple of other output ports via the common return path.

[0029] The digital controller is used to acquire electrical parameters corresponding to the output port, common return path, and decoupling capacitor, and performs port pairing, return charge calculation, current inversion, and compensation current calculation based on the acquisition results. The branch current injection circuit is connected to the branch compensation node corresponding to the output port and is used to apply compensation current to the corresponding output port according to the branch compensation current given by the digital controller. The return current injection circuit is connected to the return compensation node corresponding to the common return path and is used to apply compensation current to the common return path according to the common return compensation current given by the digital controller. The branch current injection circuit and the return current injection circuit can be controlled current source circuits or closed-loop current tracking circuits composed of power switching devices, inductors, and current sampling elements. Therefore, the subsequently calculated compensation current can be applied to the corresponding compensation position through the corresponding electrical execution circuit.

[0030] It should be noted that the output port is the electrical connection port for the communication DC power supply system to output DC power to the load branch; the common return path compensation node is the electrical connection position used to apply a common return path compensation current; and the DC negative terminal reference point is the reference potential point used in the communication DC power supply system to determine the polarity of the voltage disturbance in the common return path. Multiple output ports share the same common return path. It is not required that the multiple output ports have the same output voltage, nor that the multiple load branches have the same load characteristics. As long as the return current of the multiple output ports returns to the DC negative terminal reference point via the same common return path, it falls within the scope of the communication DC power supply system described in this embodiment.

[0031] The sampling window employs a rolling update method. In the previous ripple cycle, the digital controller acquires small-signal electrical parameters and forms port pairs, return charge quantities, and compensation current sequences. In the current ripple cycle, the digital controller outputs the corresponding compensation current according to the same ripple phase index. When new sampling data enters the sampling window, the digital controller updates the port pairs, return charge quantities, and compensation current sequences corresponding to the next ripple cycle. This rolling update method is suitable for periodic or quasi-periodic ripples caused by switching changes, periodic load pulsations, or repetitive load steps in communication DC power supply systems. For non-repetitive single transient disturbances, after detecting a new port current disturbance, the digital controller uses the small-signal electrical parameters already acquired in the current sampling window for updating the compensation current in subsequent sampling times.

[0032] S101: Acquire small-signal electrical parameters within a sampling window covering one ripple cycle. Pair them according to the sign and absolute value of the half-cycle integral of the product of the port current disturbance and the common return path voltage disturbance to obtain port pairs. These port pairs are then output from the disturbance port. and the disturbed output port constitute;

[0033] Specifically, the sampling window is a time window used to collect ripple operation data, and the sampling window covers a complete ripple cycle. The ripple cycle can be determined by the adjacent zero-crossing moments of the common return path voltage disturbance, or by the ripple sampling synchronization signal of the communication DC power supply system. The sampling window covering a complete ripple cycle ensures that each output port performs port current disturbance extraction, half-cycle integration calculation, and port pairing under the same time reference, avoiding distortion of port pairing results caused by different sampling time periods for different output ports.

[0034] Wherein, the small-signal electrical parameters are the sampled electrical parameters corresponding to the output port, the common return path, and the decoupling capacitor after the DC component has been removed; the port current disturbance takes the direction of the current flowing into the corresponding output port as the positive direction, and the common return path voltage disturbance takes the potential of the common return path compensation node relative to the DC negative terminal reference point as the positive direction.

[0035] Specifically, the sampled electrical parameters corresponding to the output port are used to characterize the voltage and current changes at the output port; the sampled electrical parameters corresponding to the common return path are used to characterize the voltage and current changes on the common return path; and the sampled electrical parameters corresponding to the decoupling capacitor are used to characterize the charge absorption or release state at the corresponding output port. DC component removal refers to removing the DC operating reference quantity from the sampled electrical parameters, retaining the small-signal component related to ripple disturbance. For any sampled electrical parameter... The corresponding small semaphore can be obtained according to the following formula. :

[0036]

[0037] In the formula, Sample electrical parameters within the sampling window The DC component. This DC component can be determined by the average value within the sampling window:

[0038]

[0039] In the formula, For the ripple period, This represents the start time of the sampling window. When using discrete sampling, It can be obtained by the arithmetic mean of the values ​​of each sampling point within the sampling window. The port current disturbance, port voltage disturbance, common return path voltage disturbance, common return path current disturbance, and decoupling capacitor current obtained in this way are all under the same ripple period and the same small-signal reference, and can participate in subsequent in-phase judgment, integral calculation, and charge calculation.

[0040] It should be noted that the direction of port current disturbance is positive when it flows into the corresponding output port. This is to ensure that the integral sign of the product of the port current disturbance and the common return path voltage disturbance has a unified electrical meaning. When the integral result of the product of the port current disturbance and the common return path voltage disturbance of an output port within the same ripple half-cycle is positive, it indicates that the output port injects disturbance energy into the common return path within that ripple half-cycle. When the integral result of the product of the port current disturbance and the common return path voltage disturbance of an output port within the same ripple half-cycle is negative, it indicates that the output port receives disturbance energy transmitted through the common return path within that ripple half-cycle. Through this symbol definition, it is possible to distinguish between the disturbing output port and the disturbed output port based on the energy direction, rather than solely relying on the amplitude of a single port voltage ripple. This is beneficial for locating the cross-port ripple transmission direction in scenarios where multiple output ports share the same common return path.

[0041] Specifically, the pairing process of the port pairs includes:

[0042] Voltage disturbance of the common return path The adjacent zero-crossing moments are used as the boundaries of the ripple half-cycle, and the port current disturbance of each output port is extracted within the same ripple half-cycle. ;

[0043] Specifically, For voltage disturbances in the common return path, For the first Port current disturbance at each output port. Common return path voltage disturbance. The zero-crossing moment is the sampling moment when the disturbance voltage relative to the DC negative terminal reference point changes from positive to negative or from negative to positive. A ripple half-cycle is formed between two adjacent zero-crossing moments. If the zero-crossing moment is located between two adjacent sampling points, the zero-crossing moment can be obtained by linear interpolation based on the common return path voltage disturbance value of the two adjacent sampling points.

[0044] Voltage disturbance of the common return path Using adjacent zero-crossing moments as the ripple half-cycle boundary ensures that the voltage disturbance of the common return path within each ripple half-cycle remains within the same polarity range. Thus, the integral sign of the product of the port current disturbance and the common return path voltage disturbance reflects the direction of the disturbance energy of the corresponding output port relative to the common return path within that half-cycle. Extracting the port current disturbance of each output port within the same ripple half-cycle means that each output port uses the same half-cycle boundary. Instead of setting different time boundaries for different output ports, this ensures that the half-cycle integrals of each output port are comparable.

[0045] The half-cycle integral of each output port is calculated using the following formula. :

[0046]

[0047] In the formula, This is the start time of the ripple half-cycle. This is the end time of the ripple half-cycle;

[0048] Specifically, the half-cycle integral Characterizing the first The half-cycle energy projection of the port current disturbance at each output port under the influence of the voltage disturbance in the common return path. Due to For the product of the port current disturbance and the common return path voltage disturbance at the same sampling time, the product is... Integrating over the interval yields the first... The direction and relative magnitude of disturbance energy exchange between each output port and the common return path during the ripple half-cycle.

[0049] When implementing this using a digital controller, the above integral form can be converted into a discrete summation form. Let the sampling time within the same ripple half-cycle be . The interval between adjacent sampling times is Then the half-cycle integral It can be represented as:

[0050]

[0051] If the sampling interval is fixed, then The sampling period is fixed; if the sampling interval changes, then... This represents the actual time interval between adjacent sampling moments. The continuous integral form and the discrete summation form are physically identical, both used to obtain the half-cycle integral of each output port relative to the voltage disturbance of the common return path.

[0052] Will For positive output ports Arranged from largest to smallest as a positive integral port sequence, For negative output ports Arranged from largest to smallest, this is the negative integral port sequence;

[0053] Specifically, the output ports in the positive integral port sequence represent the output ports that inject disturbance energy into the common return path during the current ripple half-cycle, while the output ports in the negative integral port sequence represent the output ports that receive disturbance energy transmitted through the common return path during the current ripple half-cycle. The positive and negative integral ports are then respectively... The ports are arranged from largest to smallest to determine their relative position within the same ripple half-cycle based on the absolute value of the half-cycle integral. For a positive integral port sequence, The position indicates the relative magnitude of the disturbance energy injected into the common return path by the corresponding output port; for negative integral port sequences, The position indicates the relative magnitude of the disturbance energy transmitted through the common return path received by the corresponding output port.

[0054] When two output ports If the integral values ​​are the same, their order can be determined based on the fixed port numbers of the communication DC power supply system. These fixed port numbers can be determined based on the physical arrangement order of the output ports, the sampling channel numbers, or the port addresses written during system initialization. This process is only used to maintain the uniqueness of the sorting results when the absolute values ​​of the integrals are the same; it does not change the... The symbolic meaning and energy direction judgment results.

[0055] The output ports in the positive integration port sequence and the output ports of the same position in the negative integration port sequence are paired. In any pair of ports, the positive integration port is used as the perturbation output port. The negative integral port in the same port pair is used as the disturbed output port. .

[0056] Specifically, both the positive integral port sequence and the negative integral port sequence are calculated according to... After arranging the absolute values ​​by position, positive and negative integration ports with the same position are paired into a port pair. This pairing method matches the output port that injects disturbance energy into the common return path with the output port that receives disturbance energy transmitted through the common return path according to the relative magnitude of the effect. In any port pair, the positive integration port is denoted as the disturbance output port. The negative integral port is denoted as the disturbed output port. The subsequent steps will calculate the return charge and compensation current for this port pair.

[0057] If multiple port pairs are formed within the same ripple half-cycle, subsequent processing can be performed on each port pair separately, or any port pair can be selected as the current processing target according to the computing resources of the digital controller or the control priority of the communication DC power supply system. If the number of ports in the positive integral port sequence and the negative integral port sequence are inconsistent, port pairing is only performed on the same positions that exist in both sets of port sequences; output ports that do not form port pairs are not considered as disturbance output ports in the current port pair. Or the output port is disturbed Proceed to S102. Through the above port pairing, a correspondence between the disturbance source port and the disturbed object port can be established when multiple output ports share a common return path. This is beneficial for subsequent extraction of return charge and distribution of compensation current for the port pair.

[0058] S102: Disturbed output port For the object, the return charge is obtained by integrating the difference between the decoupling capacitor current and the equivalent admittance current of the common return path. ;

[0059] Specifically, S102 is executed after the port pair is formed in S101, and the object of processing is the disturbed output port in the port pair. Disturbed output port The corresponding decoupling capacitor will vary depending on the output port being disturbed. The port voltage disturbance causes charging and discharging; the decoupling capacitor current reflects the local charge change at that output port; the equivalent admittance current of the common return path reflects the equivalent current component formed in the common return path under the influence of the voltage disturbance. By calculating the integral difference between the decoupling capacitor current and the equivalent admittance current of the common return path, the disturbed output port can be obtained. Return charge quantity related to the influence of the common return path .

[0060] It should be noted that the amount of return charge... Instead of directly sampling electrical parameters, it is based on the disturbance output port. The charge balance between the decoupling capacitor current and the equivalent admittance current of the common return path during the current ripple cycle is calculated. This return charge is used to characterize the disturbance at the output port during the current ripple cycle. The charge change caused by the disturbance in the common return path is the subsequent charge entering the disturbed output port. This provides the data foundation for current inversion and compensation current allocation. This process avoids compensating solely based on the amplitude of the disturbed output port voltage ripple, thus ensuring that the compensation current calculation corresponds to the actual charge migration process induced by the common return path.

[0061] Specifically, the amount of return charge The process of obtaining it includes:

[0062] To flow into the disturbed output port The direction of the decoupling capacitor is used as the decoupling capacitor current. The positive direction;

[0063] Specifically, the disturbed output port The corresponding decoupling capacitor is connected to the disturbed output port. Between the reference potential and the reference potential. The direction of the current flowing into the decoupling capacitor is taken as the decoupling capacitor current. The positive direction of the decoupling capacitor current allows it to absorb charge with a positive value and release charge with a negative value. By unifying the positive direction of the decoupling capacitor current, subsequent calculations... At that time, the integral value of the decoupling capacitor current can represent the disturbed output port. The result of charge absorption or release within the current ripple cycle.

[0064] Decoupling capacitor current It can be accessed through the disturbed output port The current is obtained by sampling the current of the corresponding decoupling capacitor branch, or it can be obtained based on the disturbed output port. The decoupling capacitor current is obtained by converting the port voltage disturbance and the equivalent decoupling capacitor parameters. When using the conversion method, the decoupling capacitor current can be determined by the following formula:

[0065]

[0066] In the formula, Disturbed output port The corresponding equivalent decoupling capacitor, Disturbed output port Port voltage disturbances. Regardless of whether direct sampling or parameter conversion is used, the decoupling capacitor current must be maintained. The positive direction is the flow into the disturbed output port. The direction of the corresponding decoupling capacitor is used to ensure that the sign of the subsequent integral difference is consistent.

[0067] Based on the current disturbance of the common return path voltage disturbances along the common return path The equivalent admittance current of the common return path is obtained. ;

[0068] Specifically, common return path current disturbance The disturbance of the common return path current after removing the DC component; the common return path voltage disturbance. This is the disturbance of the common return path compensation node's potential relative to the DC negative terminal reference point after removing the DC component. The equivalent admittance of the common return path is used to characterize the small-signal admittance relationship between the common return path current disturbance and the common return path voltage disturbance within the current ripple cycle. The equivalent admittance current of the common return path... It is the current component formed by the voltage disturbance of the common return path under the action of the equivalent admittance.

[0069] Wherein, the equivalent admittance current of the common return path and common return path current disturbance All flows into the disturbed output port via a common return path. The direction is positive; voltage disturbance in the common return path At the sampling time, the equivalent admittance current of the common return path for ,in,

[0070]

[0071] In the formula, The current sampling time The corresponding common return path equivalent admittance, The current sampling time The corresponding admittance ratio sampling set, wherein the admittance ratio sampling set is composed of samples taken within the current ripple period at the sampling time. It consists of multiple sampling times corresponding to the admittance estimation neighborhood and where the voltage disturbance of the common return path is not zero. The number of sampling times in the admittance ratio sampling set, and , The sampling time is within the set of admittance ratio samples. For the common return path current disturbance at the sampling time The value of , For the common return path voltage disturbance at the sampling time The value of ;

[0072] The voltage disturbance of the common return path The sampling time does not participate in the equivalent admittance of the common return path. Calculation of the ratio.

[0073] Wherein, the admittance estimation neighborhood is the area surrounding the sampling time within the current ripple period. The sampling period, or the current sampling time. The ripple half-cycle in which it occurs. If there are fewer than two sampling times in the admittance estimation neighborhood where the voltage disturbance of the common return path is not zero, then the admittance estimation neighborhood is expanded to the adjacent sampling intervals within the current ripple cycle, until the number of sampling times in the admittance ratio sampling set meets the requirement. In the rolling update mode, the equivalent admittance current sequence of the common return path calculated in the current ripple cycle is used to calculate the compensation current under the same ripple phase index in the next ripple cycle.

[0074] It should be noted that the sampling time when the voltage disturbance of the common return path is zero is not included in the ratio calculation, in order to avoid the equivalent admittance of the common return path. The calculation results in a zero denominator. This sampling moment still falls within the sampling window and can be used for time alignment and integration boundary confirmation, but it is not used to calculate the equivalent admittance of the common return path. The ratio of the samples. For sampling moments when the common return path voltage disturbance is zero, the equivalent admittance of the common return path corresponding to adjacent non-zero sampling moments can be used for interpolation to obtain the equivalent admittance current of the common return path corresponding to that sampling moment. and according to Obtain the equivalent admittance current of the common return path at the sampling time. Alternatively, the equivalent admittance change curve of the common return path can be fitted based on the sampling points of the non-zero voltage disturbance within the current ripple period, and then obtained from this curve and the voltage disturbance of the common return path. .

[0075] The above processing does not change the equivalent admittance current of the common return path, which flows into the disturbed output port through the common return path. The direction is defined as the positive direction.

[0076] The amount of return charge is calculated using the following formula. :

[0077]

[0078] In the formula, The equivalent admittance current for the common return path, This is the starting sampling time of the current ripple cycle. This represents the sampling time within the current ripple cycle.

[0079] Specifically, It can be determined by the initial zero-crossing moment of the current ripple cycle, the initial moment of the sampling window, or the system ripple synchronization signal; This refers to any sampling moment involved in the calculation within the current ripple period. In the integral expression... Indicates the disturbed output port The corresponding decoupling capacitor at time The current, Indicates the common return path at time... The equivalent admittance current. The integral result of the difference between the two. This indicates the sampling time from the start of the current ripple period. up to the current sampling time During the time period, the disturbed output port The return charge is obtained by subtracting the contribution of the equivalent admittance current of the common return path from the charge change of the decoupling capacitor.

[0080] When implemented using a digital controller, if the sampling times within the current ripple period are sequentially as follows: The sampling interval is The amount of return charge can then be calculated in discrete form:

[0081]

[0082] In the formula, This represents the time interval between adjacent sampling moments. For a fixed sampling period system, For a fixed value; for a non-fixed sampling period system, This represents the actual time interval between the corresponding sampling moments. Through the above calculations, the disturbed output port can be continuously obtained within the current ripple period. Reflux charge This is to facilitate subsequent inversion into the disturbed output port. The current and the generated compensation current provide input data.

[0083] For example, in a communication DC power supply system with four output ports sharing the same common return path, the first output port supplies power to the RF power amplifier, the second output port supplies power to the clock unit, the third output port supplies power to the baseband processing unit, and the fourth output port supplies power to the interface unit. When the load current of the RF power amplifier undergoes a step change, the port current disturbance of the first output port will form a common return path voltage disturbance on the common return path. The system acquires small-signal electrical parameters within a sampling window covering one ripple cycle and divides the ripple half-cycle at the zero-crossing moment of the common return path voltage disturbance. If the half-cycle integral corresponding to the first output port is positive and has an earlier rank, and the half-cycle integral corresponding to the second output port is negative and has the same rank as the first output port, then the first and second output ports form a port pair, with the first output port serving as the disturbance output port. The second output port serves as the disturbed output port. Subsequently, the system takes the second output port as the target, obtains the decoupling capacitor current corresponding to the second output port, and combines it with the equivalent admittance current of the common return path to obtain the return charge corresponding to the second output port through integration difference. .

[0084] Through the above processing, the communication DC power supply system can first pair the disturbed output port and the disturbed output port based on the disturbance energy direction on the common return path, and then obtain the return charge based on the charge balance between the decoupling capacitor current of the disturbed output port and the equivalent admittance current of the common return path. This return charge provides data for the subsequent inversion of the current entering the disturbed output port, as well as the generation branch compensation current and the common return compensation current, which helps to avoid the problem of increased ripple at other output ports caused by performing separate reverse compensation only on the disturbed output port.

[0085] S103: Within the current inversion range, the reverse injection current is generated by the disturbance of the output port voltage. The ratio relative to the port current disturbance and the amount of return charge. The derivative is used to invert the output at the disturbed port. current ;

[0086] Specifically, S103, after determining the port pair and obtaining the disturbed output port... Reflux charge Execute afterward. Disturb the output port. The port current disturbance reflects the current source at the output port that causes a disturbance to the common return path during the current ripple cycle; the disturbed output port Reflux charge Reflects the effect of the common return path on the disturbed output port The resulting charge change. Since multiple output ports share the same common return path, the disturbance output port... The resulting reverse injection current Not all are limited to the disturbance output port Within the branch circuit, a portion of it will enter the disturbed output port along the common return path. Therefore, it is necessary to first invert this part of the current before it is included in the calculation of subsequent branch compensation current and common return current compensation current.

[0087] The current inversion interval is used to define the effective sampling time for performing current inversion. If the output port is disturbed... If the port current disturbance is zero, then the reverse injection current... There is no effective current reference relative to the ratio of port current disturbances; if the disturbed output port... If the port voltage disturbance and the common return path voltage disturbance are in opposite phase, then the common return path voltage disturbance will affect the disturbed output port. The direction of charge action and the disturbed output port The port voltage disturbance is in the opposite direction and is not considered as an input to the disturbed output port. The object of current inversion. Therefore, the current inversion interval is simultaneously constrained by the effectiveness of port current disturbances and the in-phase nature of voltage disturbances.

[0088] Specifically, the entry into the disturbed output port current The inversion process includes:

[0089] According to the disturbance output port The non-zero sampling interval corresponding to the port current disturbance, and the disturbed output port. The in-phase sampling interval of the port voltage disturbance relative to the common return path voltage disturbance is used to determine the current inversion interval;

[0090] Specifically, the perturbation output port The port current disturbance is denoted as The non-zero sampling interval is the set of sampling times that satisfy the following formula:

[0091]

[0092] Disturbed output port The port voltage disturbance is denoted as The voltage disturbance of the common return path is denoted as The in-phase sampling interval is the set of sampling times that satisfy the following formula:

[0093]

[0094] In the formula, Indicates the disturbed output port The port voltage disturbance and the common return path voltage disturbance have the same polarity; This indicates that at least one disturbance is at a zero-crossing position. The intersection of the non-zero sampling interval and the in-phase sampling interval yields the current inversion interval. Therefore, current inversion occurs only at the disturbance output port. It has effective port current disturbance, and the disturbed output port Sampling is performed when the common return path is in the same direction of charge.

[0095] It should be noted that the in-phase sampling interval is not required. and The amplitudes are the same, and their phases are not required to be completely coincident. Their function is to filter out voltage disturbances in the common return path that affect the disturbed output port. The sampling time at which unidirectional charging occurs. Setting this interval avoids interference at the output port. Ineffective inversion of return current occurs when the common return path is in the opposite charge direction.

[0096] According to the disturbance output port Port voltage disturbance and disturbance output port The equivalent impedance of the branch is used to obtain the reverse injection current. ;

[0097] Specifically, the perturbation output port The port voltage disturbance is denoted as Disturbance output port The equivalent impedance of the branch is denoted as The equivalent impedance of the branch is used to characterize the disturbance output port. The equivalent impedance of the branch to small-signal voltage disturbances during the current ripple period. This equivalent impedance can be determined from the disturbance output port. The correspondence between port voltage disturbance and port current disturbance within the current ripple period can be calculated, or it can be obtained from the disturbance output port. The corresponding branch's filter element, line impedance, and load small-signal impedance are calculated together.

[0098] In one possible implementation, reverse injection current... Obtained by the following formula:

[0099]

[0100] In the formula, the negative sign indicates reverse injection current. With disturbance output port The equivalent disturbance current corresponding to the port voltage disturbance is in the opposite direction. If the branch equivalent impedance If the frequency domain is used, the value is taken at the current ripple frequency and then used in the calculation; if the branch equivalent impedance In the time domain, it is calculated by converting the corresponding sampled values ​​of the port voltage disturbance and port current disturbance within the current ripple cycle. The reverse injection current... It is for the disturbance output port The initial compensation current generated by the ripple at this end is not directly used as the final branch compensation current.

[0101] The following formula is used to invert the input to the disturbed output port. current :

[0102]

[0103] In the formula, To disturb the output port Port current disturbance.

[0104] Specifically, Indicates reverse injection current Relative to the disturbance output port Port current disturbance The substitution ratio; this substitution ratio is used to characterize the equivalent substitution share of the reverse injected current relative to the original port current disturbance entering the common return path. Indicates the disturbed output port Reflux charge The rate of change at the current sampling moment. Multiplying the substitution ratio by the rate of change of the return charge yields the reverse injection current. Entering the disturbed output port via the common return path current .

[0105] When implemented using a digital controller, the amount of return charge The derivative can be calculated by the difference between adjacent sampling times. Let the current sampling time be... The previous sampling time was ,but:

[0106]

[0107] If the sampling interval is fixed ,but:

[0108]

[0109] Therefore, the signal enters the disturbed output port. The current can be expressed as:

[0110]

[0111] It should be noted that the discrete expressions described above are used to illustrate feasible computational paths under digital sampling conditions and do not change the continuous form. Definition. For sampling times that do not fall within the current inversion interval, entry into the disturbed output port is not executed. Current inversion, and the corresponding sampling time After being recorded as zero, it participates in the subsequent compensation current sequence calculation. Therefore, the branch compensation current... and common return current compensation The system has corresponding sampling point values ​​throughout the entire ripple period, thus avoiding data breaks in the compensation current sequence.

[0112] S104: Based on reverse injection current Current and return charge The derivative of the derivative is used to obtain the branch compensation current. and common return current compensation And load it into the corresponding compensation location;

[0113] Specifically, S104 has received a reverse injection current. , Enter the disturbed output port current and return charge Based on this, reverse injection current is executed. Indicates the output port of disturbance The initial compensation current generated by the voltage ripple at this terminal enters the disturbed output port. current This indicates that the initial compensation current enters the disturbed output port via the common return path. Current component; return charge The derivative of the value represents the disturbance output port. The rate of change of return charge. By understanding the current relationships among the three, the branch compensation current can be calculated separately. and common return current compensation .

[0114] Specifically, the branch compensation current The process of obtaining it includes:

[0115] Obtain disturbance output port Reverse injection current and enter the disturbed output port current ;

[0116] Specifically, reverse injection current Obtained from S103.2, the signal enters the disturbed output port. current This is obtained from S103.3. Before calculating the branch compensation current, it is necessary to ensure that both are at the same sampling time or the same control cycle. If they are output from different calculation stages, they can be aligned through sampling buffers or timestamps to ensure that the reverse injection currents corresponding to the same sampling time are at the same time. and current They participate in the same difference calculation.

[0117] Calculate the branch compensation current using the following formula. :

[0118]

[0119] Specifically, branch compensation current It is ultimately loaded onto the disturbance output port. The current at the corresponding branch compensation node. Derived by the reverse injection current. Subtracting the input to the disturbed output port current It can redirect the initial compensation current that would otherwise enter the disturbed output port via the common return path. The current component from the disturbance output port The compensation at this end is stripped. In this way, the branch compensation current still retains its effect on the disturbance output port. This enhances the local ripple suppression effect and reduces the impact of compensation current through the common return path on the disturbed output port. The secondary impact.

[0120] Specifically, the common return current compensation current The process of obtaining it includes:

[0121] Obtain the disturbed output port Reflux charge and enter the disturbed output port current ;

[0122] Specifically, the amount of return charge Obtained from S102.3, it enters the disturbed output port. current Obtained from S103.3. Before obtaining the common return current compensation current, the amount of return charge... Differentiate to obtain the disturbed output port. The rate of change of return charge. The rate of change of return charge is related to the rate of change of charge entering the disturbed output port. current All adopt the aforementioned unified positive current direction.

[0123] Calculate the common return current using the following formula. :

[0124]

[0125] Specifically, the common return current compensation This is the current applied to the return compensation node corresponding to the common return path. Return charge amount. The derivative reflects the disturbed output port The corresponding rate of change of return charge enters the disturbed output port. current The output port has been affected by the disturbance. The reverse injection current enters the disturbed output port through the common return path. The difference between the two current components serves as the common return current compensation current, which can compensate for the current component corresponding to the rate of change of the remaining return charge in the common return path, so that the compensation on the common return path side and the compensation on the disturbance output port side are performed in coordination within the same ripple period.

[0126] The corresponding compensation locations include branch compensation nodes and return compensation nodes; the branch compensation nodes are disturbance output ports. The compensation node corresponding to the port voltage sampling node, and the return current compensation node is the compensation node corresponding to the common return current path voltage sampling node; the branch compensation current With the common return current compensation The loading times are the same.

[0127] Specifically, the perturbation output port The compensation node corresponding to the port voltage sampling node refers to the node connected to the disturbance output port. The port voltage sampling position is located within the current loading position of the same output branch's electrical action area. Branch compensation current. After being loaded to the compensation node of this branch, the disturbance output port is... The port voltage ripple is compensated. The return current compensation node corresponding to the common return path voltage sampling node refers to the current loading position that is located within the same common return electrical action area as the common return path voltage disturbance sampling position. Common return current compensation. After being applied to the return current compensation node, it compensates for voltage disturbances in the common return current path.

[0128] It should be noted that the branch compensation current and common return current compensation The digital controller generates a current setpoint based on the aforementioned calculation results and sends it to the branch current injection circuit connected to the branch compensation node and the return current injection circuit connected to the return current compensation node, respectively. Both the branch current injection circuit and the return current injection circuit can be controlled current source circuits or closed-loop current tracking circuits composed of power switching devices, inductors, and current sampling elements. The digital controller then calculates the current based on the branch compensation current. and common return current compensation Generate the corresponding current control quantity so that the branch current injection circuit outputs at the branch compensation node in accordance with... The corresponding compensation current causes the return current injection circuit to output at the return compensation node in accordance with... The corresponding compensation current.

[0129] For a closed-loop current tracking circuit using power switching devices, the digital controller can adjust the duty cycle of the power switching devices based on the deviation between the actual injected current and the corresponding compensation current obtained from the current sampling element, so that the actual injected current tracks the compensation current of the branch. Or common return current compensation In cases where a controlled current source circuit is used, the digital controller can output a control voltage proportional to the corresponding compensation current through a digital-to-analog converter, causing the controlled current source circuit to output the corresponding current at the corresponding compensation node. All the above execution paths are based on the calculated branch compensation current. and common return current compensation As a current reference, it does not change the calculation logic of the two types of compensation current in S104.

[0130] Branch compensation current With common return current compensation The loading time being the same means that the two types of compensation currents calculated at the same sampling time are output to the corresponding compensation positions within the same control cycle. If there is a fixed delay in the calculation process, the same output delay can be set for the two types of compensation currents, so that they are loaded under the same ripple phase. Through this timing alignment, phase misalignment between branch compensation and common return current compensation can be avoided, thus preventing disturbance at the output port. The local compensation and the common return path compensation are executed in coordination within the same ripple cycle.

[0131] For example, in a communication DC power supply system where four output ports share the same common return path, the first output port supplies power to the RF power amplifier, the second output port supplies power to the clock unit, the third output port supplies power to the baseband processing unit, and the fourth output port supplies power to the interface unit. When the load current of the RF power amplifier undergoes a step change, the first output port generates a port current disturbance and a common return path voltage disturbance on the common return path. Through the pairing process in S101, the first output port is identified as the disturbance output port. The second output port was identified as the disturbed output port. The amount of return charge corresponding to the second output port is obtained by calculating the integral difference through S102. Through the inversion process of S103, the current from the reverse injection current at the first output port to the current entering the second output port via the common return path is obtained. The compensation current is calculated using S104. As the branch compensation current applied to the first output port, As a common return current compensation current applied to the common return path, it suppresses the ripple at the first output port while limiting the secondary disturbance to the second output port caused by the compensation action through the common return path.

[0132] Through the above implementation process, the disturbed output port and the disturbed output port can be paired based on the energy projection direction of the common return path. Then, the current entering the disturbed output port for compensation action can be retrieved based on the return charge of the disturbed output port, and the compensation current can be split into branch compensation current and common return compensation current accordingly. Therefore, for communication DC power supply systems with multiple output ports sharing the same common return path, the cross-port ripple transmission caused by the common return path can be reduced without directly loading the entire compensation current of a single path onto the disturbed output port.

[0133] Example 2

[0134] like Figure 3 As shown in the example, the parts not detailed in this embodiment are as shown in Example 1. This embodiment discloses a DC power supply output ripple suppression system, including:

[0135] Pairing module 201 is used to acquire small-signal electrical parameters within a sampling window covering one ripple cycle, and pair ports according to the sign and absolute value of the half-cycle integral of the product of port current disturbance and common return path voltage disturbance. The port pairs are output from the disturbance port. and the disturbed output port constitute;

[0136] Charge module 202, used for the disturbed output port For the object, the return charge is obtained by integrating the difference between the decoupling capacitor current and the equivalent admittance current of the common return path. ;

[0137] Inversion module 203 is used to, within the current inversion range, calculate the reverse injection current generated by the disturbance of the output port voltage. The ratio relative to the port current disturbance and the amount of return charge. The derivative is used to invert the output at the disturbed port. current ;

[0138] Compensation module 204 is used to compensate for the reverse injection current. Current and return charge The derivative of the derivative is used to obtain the branch compensation current. and common return current compensation And load it into the corresponding compensation location.

[0139] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A method for suppressing DC power supply output ripple, applied to a communication DC power supply system with multiple output ports sharing the same common return path, characterized in that, include: Small-signal electrical parameters are acquired within a sampling window covering one ripple cycle. Port pairs are obtained by matching the sign and absolute value of the half-cycle integral of the product of the port current disturbance and the common return path voltage disturbance. The port pairs are then output from the disturbance port. and the disturbed output port constitute; Disturbed output port For the object, the return charge is obtained by integrating the difference between the decoupling capacitor current and the equivalent admittance current of the common return path. ; Within the current inversion range, the reverse injection current is generated by the disturbance of the output port voltage. The ratio relative to the port current disturbance and the amount of return charge. The derivative is used to invert the output at the disturbed port. current ; Based on reverse injection current Current and return charge The derivative of the derivative is used to obtain the branch compensation current. and common return current compensation And load it into the corresponding compensation location.

2. The method according to claim 1, characterized in that, The small-signal electrical parameters are the sampled electrical parameters corresponding to the output port, the common return path, and the decoupling capacitor, after the DC component has been removed; the port current disturbance takes the direction of the current flowing into the corresponding output port as the positive direction, and the common return path voltage disturbance takes the potential of the common return path compensation node relative to the DC negative terminal reference point as the positive direction.

3. The method according to claim 1, characterized in that, The pairing process of the port pairs includes: Voltage disturbance of the common return path The adjacent zero-crossing moments are used as the boundaries of the ripple half-cycle, and the port current disturbance of each output port is extracted within the same ripple half-cycle. ; The half-cycle integral of each output port is calculated using the following formula. : ， In the formula, This is the start time of the ripple half-cycle. This is the end time of the ripple half-cycle; Will For positive output ports, press Arranged from largest to smallest as a positive integral port sequence, For negative output ports Arranged from largest to smallest, this is the negative integral port sequence; The output ports in the positive integration port sequence and the output ports of the same position in the negative integration port sequence are paired. In any pair of ports, the positive integration port is used as the perturbation output port. The negative integral port in the same port pair is used as the disturbed output port. .

4. The method according to claim 1, characterized in that, The amount of return charge The process of obtaining it includes: To flow into the disturbed output port The direction of the decoupling capacitor is used as the decoupling capacitor current. The positive direction; Based on the current disturbance of the common return path voltage disturbances along the common return path The equivalent admittance current of the common return path is obtained. ; The amount of return charge is calculated using the following formula. : ， In the formula, The equivalent admittance current for the common return path, This is the starting sampling time of the current ripple cycle. This represents the sampling time within the current ripple cycle.

5. The method according to claim 4, characterized in that, The equivalent admittance current of the common return path and common return path current disturbance All flows into the disturbed output port via a common return path. The direction is positive; voltage disturbance in the common return path At the sampling time, the equivalent admittance current of the common return path for ,in, ， In the formula, The current sampling time The corresponding common return path equivalent admittance, The current sampling time The corresponding admittance ratio sampling set, wherein the admittance ratio sampling set is composed of samples taken within the current ripple period at the sampling time. It consists of multiple sampling times corresponding to the admittance estimation neighborhood and where the voltage disturbance of the common return path is not zero. The number of sampling times in the admittance ratio sampling set, and , The sampling time is within the set of admittance ratio samples. For the common return path current disturbance at the sampling time The value of , For the common return path voltage disturbance at the sampling time The possible values ​​of ; The voltage disturbance of the common return path The sampling time does not participate in the equivalent admittance of the common return path. Calculation of the ratio.

6. The method according to claim 1, characterized in that, The entry into the disturbed output port current The inversion process includes: According to the disturbance output port The non-zero sampling interval corresponding to the port current disturbance, and the disturbed output port. The in-phase sampling interval of the port voltage disturbance relative to the common return path voltage disturbance is used to determine the current inversion interval; According to the disturbance output port Port voltage disturbance and disturbance output port The equivalent impedance of the branch is used to obtain the reverse injection current. ; The following formula is used to invert the input to the disturbed output port. current : ， In the formula, To disturb the output port Port current disturbance.

7. The method according to claim 1, characterized in that, The branch compensation current The process of obtaining it includes: Obtain disturbance output port Reverse injection current and enter the disturbed output port current ; Calculate the branch compensation current using the following formula. : 。 8. The method according to claim 1, characterized in that, The common return current compensation current The process of obtaining it includes: Obtain the disturbed output port Reflux charge and enter the disturbed output port current ; Calculate the common return current using the following formula. : 。 9. The method according to claim 1, characterized in that, The corresponding compensation locations include branch compensation nodes and return compensation nodes; the branch compensation node is a disturbance output port. The compensation node corresponding to the port voltage sampling node, and the return current compensation node is the compensation node corresponding to the common return current path voltage sampling node; the branch compensation current With the common return current compensation The loading times are the same.

10. A DC power supply output ripple suppression system, implemented based on the method of any one of claims 1-9, characterized in that, include: The pairing module is used to acquire small-signal electrical parameters within a sampling window covering one ripple cycle, and to obtain port pairs based on the sign and absolute value of the half-cycle integral of the product of the port current disturbance and the common return path voltage disturbance. These port pairs are then output from the disturbance port. and the disturbed output port constitute; Charge module, used for output port under disturbance For the object, the return charge is obtained by integrating the difference between the decoupling capacitor current and the equivalent admittance current of the common return path. ; The inversion module is used to, within the current inversion range, inject the current in the reverse direction based on the voltage disturbance at the perturbation output port. The ratio relative to the port current disturbance and the amount of return charge. The derivative is used to invert the output at the disturbed port. current ; Compensation module, used to adjust based on reverse injection current Current and return charge The derivative of the derivative is used to obtain the branch compensation current. and common return current compensation And load it into the corresponding compensation location.

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