Use shared feedback in two or more reactive schemes

Abstract

Disclosed is the use of shared feedback in two or more reactive schemes. In particular, a power delivery system may include: a power converter configured to be electrically coupled to a power source and further configured to supply electrical energy to one or more loads electrically coupled to the output of the power converter; and a control circuit system configured to control the power converter according to a control variable. The control circuit system may include: a first control mechanism configured to generate a first intermediate control variable based on a first physical quantity associated with the power delivery system; a second control mechanism configured to generate a second intermediate control variable based on a second physical quantity associated with the power delivery system; a selector configured to select a control variable from the first and second intermediate control variables; and a shared feedback memory element.

Description

[0001] This application is a divisional application of Chinese patent application No. 202110866810.5, filed on July 29, 2021, entitled “Using Shared Feedback in Two or More Reactive Schemes”.

[0002] Cross-references to related applications

[0003] This disclosure claims priority to U.S. Provisional Patent Application Serial No. 63 / 058,032, filed July 29, 2020, the entire contents of which are incorporated herein by reference. Technical Field

[0004] This disclosure generally relates to circuitry for electronic devices, including but not limited to personal portable devices such as cordless phones and media players, and more specifically, to limiting current in power converters. Background Technology

[0005] Portable electronic devices, including cordless phones such as mobile / cellular phones, MP3 players, and other consumer audio devices, are widely used. Such portable electronic devices may include circuitry for implementing a power converter that converts battery voltage (e.g., provided by a lithium-ion battery) into a power supply voltage delivered to one or more components of the portable electronic device. The power delivery network can also regulate this power supply voltage and isolate the downstream loads of these devices from fluctuations in the battery's output voltage during operation.

[0006] In addition to adjusting the power rails used for the power supply voltage, it may be desirable for the power converter (or the control circuitry used for the power converter) to provide active protection mechanisms to limit the amount of current that can be drawn by one or more components powered from the power rails. Summary of the Invention

[0007] Based on the teachings of this disclosure, one or more disadvantages and problems associated with existing methods of operating power converters can be reduced or eliminated.

[0008] According to embodiments of this disclosure, a power delivery system may include: a power converter configured to be electrically coupled to a power source and further configured to supply electrical energy to one or more loads electrically coupled to the output of the power converter; and a control circuit system configured to control the power converter according to control variables. The control circuit system may include: a first control mechanism configured to generate a first intermediate control variable based on a first physical quantity associated with the power delivery system; a second control mechanism configured to generate a second intermediate control variable based on a second physical quantity associated with the power delivery system; a selector configured to select a control variable from the first and second intermediate control variables; and a shared feedback memory element configured to feed back the control variables to the inputs of the first and second control mechanisms, such that the first control mechanism generates the first intermediate control variable based on the first physical quantity and the control variable, and the second control mechanism generates the second intermediate control variable based on the second physical quantity and the control variable.

[0009] According to these and other embodiments of this disclosure, a method can be used in a power delivery system having a power converter configured to be electrically coupled to a power source and also configured to supply electrical energy to one or more loads electrically coupled to the output of the power converter. The method may include generating a first intermediate control variable based on a first physical quantity associated with the power delivery system using a first control mechanism. The method may also include generating a second intermediate control variable based on a second physical quantity associated with the power delivery system using a second control mechanism. The method may further include: selecting a control variable from the first and second intermediate control variables; controlling the power converter according to the control variable; storing the control variable in a shared feedback memory element; and feeding the control variable back to inputs of the first and second control mechanisms, such that the first control mechanism generates the first intermediate control variable based on the first physical quantity and the control variable, and the second control mechanism generates the second intermediate control variable based on the second physical quantity and the control variable.

[0010] According to these and other embodiments of this disclosure, a mobile device may include a power supply, one or more loads, a power converter electrically coupled to the power supply and further configured to supply electrical energy to one or more loads, and a control circuitry configured to control the power converter according to control variables. The control circuitry may include: a first control mechanism configured to generate a first intermediate control variable based on a first physical quantity associated with the power delivery system; a second control mechanism configured to generate a second intermediate control variable based on a second physical quantity associated with the power delivery system; a selector configured to select a control variable from the first and second intermediate control variables; and a shared feedback memory element configured to feed back the control variables to the inputs of the first and second control mechanisms, such that the first control mechanism generates the first intermediate control variable based on the first physical quantity and the control variable, and the second control mechanism generates the second intermediate control variable based on the second physical quantity and the control variable.

[0011] The technical advantages of this disclosure will be apparent to those skilled in the art from the accompanying drawings, description, and claims included herein. The objects and advantages of the embodiments will be realized and achieved, at least by means of the elements, features, and combinations particularly pointed out in the claims.

[0012] It should be understood that the foregoing general description and the following detailed description are illustrative and do not limit the claims set forth in this disclosure. Attached Figure Description

[0013] A more complete understanding of this embodiment and its advantages can be obtained by referring to the following description in conjunction with the accompanying drawings, in which the same reference numerals denote the same features, and wherein:

[0014] Figure 1 A block diagram of selected components of an example power delivery network according to an embodiment of the present disclosure is shown;

[0015] Figure 2 An example diagram showing the open-circuit voltage of a battery and its state of charge according to an embodiment of the present disclosure is provided.

[0016] Figure 3 A block diagram of selected components of an example equivalent circuit model of a battery according to an embodiment of the present disclosure is shown;

[0017] Figure 4 An example graph showing battery voltage and battery current and the time associated with a current step drawn from the battery according to an embodiment of the present disclosure is shown.

[0018] Figure 5An example first-order model of a battery, simplified to a time-varying voltage source in series with an equivalent series resistance, is shown according to an embodiment of the present disclosure.

[0019] Figure 6 An example diagram showing the maximum battery current and the internal effective battery voltage for battery protection according to an embodiment of this disclosure is shown;

[0020] Figure 7 An embodiment according to this disclosure is shown. Figure 1 A block diagram of the selected impedance within the power delivery network is shown below;

[0021] Figure 8 An example diagram showing the output power of a power converter and the battery current drawn by the power converter according to an embodiment of the present disclosure is illustrated.

[0022] Figure 9 An example diagram showing the maximum battery current versus internal effective battery voltage for power converter stability according to an embodiment of the present disclosure is provided.

[0023] Figure 10 An example diagram showing the maximum battery current versus internal effective battery voltage due to power limitation considerations according to an embodiment of the present disclosure is shown;

[0024] Figure 11 An example diagram showing the maximum battery current versus internal effective battery voltage due to current limiting considerations, according to an embodiment of this disclosure, is provided; and

[0025] Figure 12 A block diagram of selected components of an example control circuit system for controlling a power converter according to an embodiment of the present disclosure is shown. Detailed Implementation

[0026] Figure 1 A block diagram of selected components of an example power delivery network 10 according to an embodiment of the present disclosure is shown. In some embodiments, the power delivery network 10 may be implemented within a portable electronic device, such as a smartphone, tablet, game controller, and / or other suitable device.

[0027] like Figure 1 As shown, the power delivery network 10 may include a battery 12 and a power converter 20, which is configured to deliver the battery voltage V generated by the battery 12. CELL Converted into a power supply voltage V for supplying power to multiple downstream components 18. SUPPLY Each downstream component 18 can draw a corresponding current I from the output of the power converter 20. LOAD1 I LOAD2 I LOAD3This means that the total load current I can be generated by the power converter 20. LOAD =I LOAD1 +I LOAD2 +…+I LOADN The power converter 20 may be implemented using a boost converter, buck converter, buck-boost converter, transformer, charge pump, and / or any other suitable power converter. The downstream components 18 of the power delivery network 10 may include any suitable functional circuitry or devices of the power delivery network 10, including but not limited to other power converters, processors, audio encoders / decoders, amplifiers, display devices, etc.

[0028] like Figure 1 As shown, the power delivery network 10 may also include a control circuitry 30 for controlling the operation of the power converter 20, including switching and commutation of switches within the power converter 20. Furthermore, as described in more detail below, the control circuitry 30 may also implement measures to limit the current I drawn from the battery 12. CELL Its proactive protection mechanism.

[0029] It is generally known that lithium-ion batteries operate from 4.2V down to 3.0V, which is called the open-circuit voltage V of the battery (e.g., battery 12). OC When a battery discharges due to the current drawn from it, its state of charge may decrease, and its open-circuit voltage V may also decrease. OC (It can be a function of the state of charge) and may also decrease due to electrochemical reactions occurring within the battery, such as Figure 2 As shown. At the open-circuit voltage V OC Outside the 3.0V and 4.2V range, the capacity, lifespan, and safety of lithium-ion batteries can degrade. For example, at approximately 3.0V, about 95% of the energy in a lithium-ion battery cell may be consumed (i.e., at 5% state of charge), and if further discharge continues, the open-circuit voltage V... OC It will easily drop rapidly. Below approximately 2.4V, the metal plates of a lithium-ion battery may corrode, which can lead to higher internal impedance, lower capacity, and potential short circuits. Therefore, to protect batteries (e.g., battery 12) from over-discharge, many portable electronic devices prevent discharge below a predetermined end-of-discharge voltage V. CELL-MIN The operation.

[0030] Figure 3 A block diagram of selected components of an equivalent circuit model of battery 12 according to an embodiment of the present disclosure is shown. Figure 3 As shown, battery 12 can be modeled as having battery cell 32, which has an open-circuit voltage. VOCIt is connected in series with multiple parallel resistor-capacitor sections 34 and also in series with the equivalent series resistance 36 of the battery 12. This equivalent series resistance 36 has a resistance of R0. Resistors R1, R2, ..., R N and their respective capacitors C1, C2, ..., C N It can simulate the time constants τ1, τ2, ..., τ related to battery chemistry. N This time constant can be related to the open-circuit voltage V. OC And the equivalent series resistance 36 is lumped together. It is worth noting that, in Figure 3 Utilizing voltage V CELL-EFF The depicted electrical nodes capture the time-varying discharge behavior of battery 12, and the battery voltage V CELL This is the actual voltage seen at the output terminal of battery 12. Voltage V CELL-EFF It may not be possible to measure it directly, and therefore the battery voltage V CELL This is likely the only voltage associated with battery 12, and it can be measured to assess battery health. It is also worth noting that at zero current draw (e.g., I0), CELL When V = 0, the battery voltage V CELL It can be equal to voltage V CELL-EFF This voltage can also be equal to the open-circuit voltage V under a given charging state. OC .

[0031] Figure 4 The battery voltage V according to an embodiment of the present disclosure is shown. CELL and battery current I CELL Example graph showing the time associated with the current step drawn from battery 12. Figure 4 As shown, in response to a current step event, as the battery voltage V... CELL The response curve experiences an initial instantaneous drop (e.g., due to the equivalent series resistance 36) and a subsequent drop due to the time constants τ1, τ2, ..., τ N The time-dependent voltage drop caused by this, battery voltage V CELL It can respond to a step jump. Open-circuit voltage V OC and various impedances R0, R1, R2, ..., R N It can be a function of the state of charge of battery 12, thus meaning that the transient response of a new, fully charged battery may be significantly different from the transient response of an aged, partially discharged battery.

[0032] In operation, the control circuit system 30 can determine the maximum battery current I that can be drawn from the battery 12 at any given time based on one or more constraints (including protection of the battery 12, stability of the power converter 20, and / or limitations associated with practical limitations). CELL .

[0033] The first constraint that can be applied by the control circuit system 30 is the battery current I. CELL The maximum battery capacity imposes a constraint. To illustrate the application of this constraint, Figure 5 A first-order model of a battery 12 according to an embodiment of the present disclosure is shown, which is simplified to have a voltage V. CELL-EFF A time-varying voltage source 38 is connected in series with an equivalent series resistor 36 of resistance R0. The maximum battery current I that battery 12 can deliver is... CELL-MAX It can be directly determined by the equivalent series resistance 36. Battery current I CELL The battery voltage V must be controlled through an equivalent series resistance of 36. CELL From voltage V CELL-EFF The reduction is equal to the resistance R0 multiplied by the battery current I. CELL The amount (e.g., V) CELL =V CELL-EFF -R0I CELL Perhaps more importantly, the battery current I flowing through the equivalent series resistance 36 CELL This may result in power dissipation within battery 12, which is equal to the resistance R0 multiplied by the battery current I. CELL The square of (e.g., P = R0I) CELL 2 At high discharge rates, the battery current I... CELL This could lead to significant heat generation within battery 12. The battery voltage V discussed above... CELL It must be maintained above the discharge termination voltage V CELL-MIN Requirements for maximum battery current I CELL-MAX The restrictions are set as follows:

[0034]

[0035] Therefore, assuming only the limitation imposed by the battery, the maximum battery current I CELL-MAX It can be voltage V CELL-EFF The function, and can be like Figure 6 The line CON1 in the diagram is drawn as shown.

[0036] To implement this limitation, the control circuit system 30 can implement an active protection scheme to ensure that the discharge termination voltage V remains constant despite transient loads on the power converter 20. CELL-MIN This will not be violated, thus avoiding damage to battery 12. For example, control circuit system 30 can be configured to monitor the battery voltage V at the terminals of battery 12. CELL And as Figure 6 The constraint CON1 in the diagram shows how the maximum battery current I drawn by the power converter 20 is changed. CELL-MAXThis is to ensure that battery 12 does not over-discharge and exceed its safe operating range, thereby extending the life of battery 12. However, this also allows the maximum battery current I to be maximized. CELL-MAX This control is complicated by the fact that the transient response of battery 12 can be multiple time constants (e.g., τ1, τ2, ..., τ...). N The function is as described above, and this time constant of a given battery is measured in a feedforward manner and the maximum battery current I is varied. CELL-MAX This may be infeasible or uneconomical. Therefore, as further described below, the control circuit system 30 can implement a negative feedback control loop around the power converter 20, which can monitor the battery voltage V. CELL And change the maximum battery current I CELL-MAX To convert the battery voltage V CELL Maintain the desired target value.

[0037] In addition to limiting the current as described above to provide protection for battery 12, it may also be desirable to limit the current to provide stability for power converter 20 so that it can operate beyond its maximum power point and into the unstable region of power converter 20, as described in more detail below. For illustration, refer to Figure 7 The figure depicts an embodiment according to the present disclosure. Figure 1 A detailed block diagram of the selected impedance within the power delivery network 10 is shown. Figure 7 As shown, the power delivery network 10 can utilize a series connection with the trace resistor 52, the current sensing resistor 54, the impedance 56 used to model the equivalent losses in the power converter 20, and the load 58 representing the sum of the downstream devices 18. Figure 5 The battery 12 is modeled as shown. The trace resistor 52 may have a resistance R representing the resistance of the electrical conduit (e.g., connector, printed circuit board trace, etc.) between the battery 12 and the power converter 20. TRACE The sensing resistor 54 may have a resistance R. SNS And it can be calculated based on Ohm's law using the voltage drop across the sensing resistor 54 and the resistance R. SNS To sense battery current I CELL The impedance of 56 can be achieved using resistor R. LOSS The internal losses of power converter 20 are modeled. After considering the power losses occurring at these different impedances, power converter 20 can deliver output power P to load 58. OUT The result is given as:

[0038]

[0039] in

[0040] RTOT =R0+R TRACE +R SNS +R LOSS

[0041] For a given total resistance R TOT and a given voltage V CELL-EFF It is possible that there exists a battery current I. CELL The output power P of the power delivery network 10 is a function of the function. OUT Maximum power P MAX It appears in current I PMAX Place, such as Figure 8 As shown, the current I PMAX It can be given by the following formula:

[0042]

[0043] Therefore, from Figure 8 As shown in the figure, if I CELL PMAX Then the power delivery system 10 will operate with optimal power efficiency and stability, and when I CELL >I PMAX At that time, it will be in the unstable region (output power P) OUT Relative to battery current I CELL (Negative slope) operation. This maximum permissible current I... PMAX It is possible Figure 9 The drawing shown is a constraint CON2 superimposed on... Figure 6 The maximum battery current I depicted in the figure CELL-MAX On constraint CON1. ​​Because the total resistance R TOT Since the slope of constraint CON1 is greater than the equivalent series resistance R0, it is obvious that the slope of constraint CON1 is steeper than that of constraint CON2. Extrapolating, constraint CON2 can capture a voltage V at 0V. CELL-EFF The horizontal axis, which is in Figure 9 This is not shown because many batteries (such as lithium-ion batteries) will not be allowed to drop to such an amplitude.

[0044] For a high-efficiency power converter, the impedance 56 is negligible compared to the equivalent series resistance 36, the trace resistor 52, and the sensing resistor 54, making the total resistance R... TOT It can be rewritten as:

[0045] R TOT ≈R0+R TRACE +R SNS

[0046] As battery 12 discharges with use, the equivalent series resistance 36 may increase, and the voltage V CELL-EFF ​This may decrease accordingly. Therefore, the maximum power P corresponds to... MAX Maximum allowable current I PMAX It can be voltage V CELL-EFF It is a function of the impedance of the power delivery network 10.

[0047] In addition to limiting the current as described above to provide protection for battery 12, and in addition to limiting the current as described above to provide stability for power converter 20, it may also be desired, or alternatively, to limit the current based on considerations of the actual implementation, as described in more detail below.

[0048] As an example, when the voltage exceeds a certain V CELL-EFF Under these conditions, the maximum battery current I of the power converter 20 CELL And therefore the maximum power delivery capacity P MAX It may become so large that the design of the power converter 20 becomes increasingly difficult or even infeasible. Practical limitations (such as the inductor saturation current and the dynamic range required by the current sensing circuit in the power converter 20) will dictate the output power P. OUT upper limit of power P LIM Limitations may need to be imposed. Thermal considerations may also need to be taken into account, and these considerations may require limiting the maximum power delivery from power converter 20.

[0049] Assuming output power P OUT Due to power limitations P LIM The power balance equation of the power transmission system 10 can be written as:

[0050]

[0051] It can be rewritten as:

[0052]

[0053] This maximum allowable current I CELL-LIM It is possible Figure 10 The drawing shown is constrained CON3A superimposed on... Figure 9 On constraints CON1 and CON2 as described in P. MAX and P LIM The separation between the two power-limited regions in Figure 10 The breakpoint, graphically represented in the image, occurs between the curves representing constraints CON2 and CON3A. This is where the power-limited P... LIM In the restricted area, the battery current I CELL The maximum value can be set by the lower of the two maximum allowable current values. For example... Figure 10 As shown, along the curve constrained by CON3A, the battery current I...CELL The maximum current may vary with voltage V CELL-EFF Decrease and increase.

[0054] In addition to limiting the current as described above to provide protection for battery 12, limiting the current as described above to provide stability for power converter 20, and limiting the current for power limiting considerations, it may also be desirable, or alternatively, to apply a fixed current limit I based on considerations of the actual implementation. FIXED As described in more detail below. Maximum permissible current I FIXED It is possible Figure 11 The drawing shown is a constraint CON3B superimposed on... Figure 10 The constraints CON1, CON2, and CON3A are depicted in the diagram. Therefore, the battery current I... CELL The maximum current can be set by the lowest of the four values ​​of the maximum allowable current.

[0055] Figure 12 A block diagram of selected components of an example control circuit system 30 for controlling a power converter 20 according to an embodiment of the present disclosure is shown. In operation, the control circuit system 30 can implement the current limiting scheme described above. Figure 12 As shown, the control circuit system 30 may include reactive engines 60, 62, and 64, which are configured to apply constraints C1, C2, and C3A, respectively, to generate a maximum constraint current I. MAX1 I MAX2 and I MAX3 The smallest block 66 can select the maximum allowable current I. FIXED (corresponding to constraint C3B) and maximum constraint current I MAX1 I MAX2 and I MAX3 The minimum value in the range is used to generate the maximum battery current I. CELL-MAX The control circuit system 30 may also include a current controller 68, which can be based on the power supply voltage V. SUPPLY and maximum battery current I CELL-MAX A switching control signal is generated to the power converter 20 to control the amount of current drawn by the power converter 20.

[0056] like Figure 12 As shown, the reactive engine 60 can be based on the battery voltage V. CELL and the maximum battery current I from the smallest block 66 CELL-MAX The feedback value is used to apply constraint C1. Similarly, each of the reactive engines 62 and 64 can be based on the sensed voltage V. SNS and the maximum battery current I from the smallest block 66 CELL-MAXThe feedback values ​​are used to apply constraints C2 and C3A. Therefore, each reactive engine 60, 62, and 64 can be an independent mechanism to limit the power transfer of the power converter 20, thereby satisfying two or more independent constraints (e.g., constraints C1, C2, and C3A), while each reactive engine 60, 62, and 64 utilizes common control parameters controlled by each reactive engine 60, 62, and 64 from the common memory element 69 (e.g., maximum battery current). ICELL-MAX Update it.

[0057] During operation, based on the maximum battery current I stored in the common memory element 69 CELL-MAX The previous sampled values ​​and the corresponding inputs of the reactive engines 60, 62 and 64 (e.g., battery voltage V) CELL or sensed voltage V SNS The reactive engines 60, 62, and 64 can adjust their respective maximum constraint currents I. MAX1 I MAX2 and I MAX3 Increasing or decreasing (or, in some embodiments, remaining constant). In some scenarios, when one of the reactive engines 60, 62, and 64 increases its corresponding maximum constraint current, another of the reactive engines 60, 62, and 64 may decrease its corresponding maximum constraint current. However, at any given time, no more than one of the reactive engines 60, 62, and 64 can set the maximum battery current I. CELL-MAX The final state variable.

[0058] At the moment when one of the reactive engines 60, 62, and 64 becomes the dominant engine (e.g., its corresponding maximum constraint current I), MAX1 I MAX2 and I MAX3 Below the maximum allowable current I FIXED Other maximum constraint currents), due to the global maximum battery current I CELL-MAX Through shared feedback, the new master engine can increment or decrement its corresponding maximum constraint current from the precise value already generated by its predecessor master engine at that instant. Therefore, this global feedback method can prevent the maximum battery current I... CELL-MAX The large instantaneous changes in this aspect mean that the maximum battery current I CELL-MAXChanges in this aspect are unlikely to cause glitches in the current drawn by the power converter 20, thereby minimizing or eliminating current and / or voltage overshoot or undershoot within the power delivery network 10. Furthermore, providing a shared feedback path (and associated circuitry, such as integrators or memory elements) among the reactive engines 60, 62, and 64, rather than each reactive engine having its own separate feedback path (and associated circuitry, such as integrators or memory elements), reduces circuit size, complexity, and cost.

[0059] As used herein, when two or more elements are referred to as being “coupled” to each other, the term indicates that the two or more elements are in electronic or mechanical communication (where applicable), whether indirect or direct, with or without intermediate elements.

[0060] This disclosure covers all changes, substitutions, variations, alterations, and modifications to the exemplary embodiments described herein that will be understood by those skilled in the art. Similarly, where appropriate, the appended claims cover all changes, substitutions, variations, alterations, and modifications to the exemplary embodiments described herein that will be understood by those skilled in the art. Furthermore, references in the appended claims to means or systems or components adapted to, arranged to, enabled to, configured to, or operable to perform a particular function cover such means or systems, whether or not they or the particular function are activated, turned on, or unlocked, provided that the means or systems are so adapted, arranged, enabled to, configured to, or operable. Therefore, modifications, additions, or omissions may be made to the systems, apparatuses, and methods described herein without departing from the scope of this disclosure. For example, components of systems and apparatuses may be integrated or separate. Moreover, the operation of the systems and apparatuses disclosed herein may be performed by more, fewer, or other components, and the described methods may include more, fewer, or other steps. Additionally, steps may be performed in any suitable order. As used in this article, “each” means each member of a set or each member of a subset of a set.

[0061] Although exemplary embodiments are shown in the accompanying drawings and described below, the principles of this disclosure can be implemented using any number of techniques (whether currently known or not). This disclosure should not be limited in any way to the exemplary embodiments and techniques shown in the accompanying drawings and described above.

[0062] Unless otherwise specified, the items depicted in the accompanying drawings are not necessarily drawn to scale.

[0063] All examples and conditional language cited herein are for illustrative purposes to help the reader understand the disclosures and concepts contributed by the inventors to advance the art, and are to be construed as not being limited to these specific examples and conditions. Although embodiments of this disclosure have been described in detail, it should be understood that various changes, substitutions, and modifications can be made thereto without departing from the spirit and scope of this disclosure.

[0064] While specific advantages have been listed above, various embodiments may include some, exclude, or include all of the listed advantages. Additionally, other technical advantages will become apparent to those skilled in the art after reading the foregoing drawings and description.

[0065] In order to help the Patent Office and any reader of any patent published in this application interpret the appended claims, the applicants wish to note that unless the words “for a means of…” or “for a step of…” are expressly used in a particular claim, they do not intend to trigger 35 U.SC §112(f) in any of the appended claims or claim elements.

Claims

1. A control circuit system configured to control a power converter according to a control variable, the control circuit system comprising: A first control mechanism is configured to generate a first intermediate control variable based on a first physical quantity associated with the power converter. A second control mechanism is configured to generate a second intermediate control variable based on a second physical quantity associated with the power converter. A selector configured to select the control variable from the first intermediate control variable and the second intermediate control variable; as well as A shared feedback memory element, configured to feed back the control variable to the inputs of the first control mechanism and the second control mechanism, such that: The first control mechanism generates the first intermediate control variable based on the first physical quantity and the control variable; and The second control mechanism generates the second intermediate control variable based on the second physical quantity and the control variable.

2. The control circuit system of claim 1, wherein the control variable is the maximum current associated with the power delivery system.

3. The control circuit system according to claim 2, wherein: The first intermediate control variable is the first current variable; The second intermediate control variable is the second current variable; and The selector is configured to select the minimum value of the first intermediate control variable and the second intermediate control variable as the control variable.

4. The control circuit system of claim 1, wherein the first physical quantity is associated with a constraint on the power supply to the power converter.

5. The control circuit system of claim 4, wherein the second physical quantity is associated with the constraints of the power converter.

6. The control circuit system of claim 1, wherein the second physical quantity is associated with the constraints of the power converter.

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