Power supply circuit and dual-plane redundant power supply system

Abstract

The application provides a power supply circuit and a double-plane redundant power supply system, which can be applied to the technical field of power supply current sharing. The current sharing control circuit comprises: an output voltage generation module, which is used for converting an output current provided by the power supply circuit to a load into an output voltage; a current sharing control module, which is used for generating a current sharing control voltage for adjusting a reference voltage of a remote sampling point according to a comparison result obtained by comparing a current sensing voltage and a current sharing bus voltage; a feedback voltage generation module, which is used for generating a feedback voltage according to a remote feedback voltage, a near-end feedback voltage and a resonance voltage; and a voltage adjustment module, which is used for adjusting the reference voltage according to the current sharing control voltage, comparing the feedback voltage with the adjusted reference voltage to obtain an error voltage, and adjusting the output voltage of the power supply circuit according to the error voltage.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power supply current sharing, and in particular to a power supply circuit and a dual-plane redundant power supply system. BACKGROUND

[0002] In order to meet the power demand of a load and improve the reliability of a system, a redundant power supply technology is usually used in a power supply system. The technology ensures that the stability of power supply of the load is not affected when an abnormality occurs in a PSU (Power Supply Unit), thereby avoiding interruption of the system. However, although the redundant power supply design is used, when an abnormality occurs in a power supply link, the load may still be powered off abnormally, thereby affecting the normal operation of the overall system.

[0003] In addition, when multiple power supply modules are used in parallel, it is necessary to ensure that the current is evenly distributed between the modules, so as to avoid that the current of a power supply path is too large or too small, thereby causing unbalanced load distribution and affecting system stability. Therefore, how to improve the current sharing accuracy and stability of the redundant power supply system is a technical problem to be solved in the related art. SUMMARY

[0004] In view of the above problems, the present application provides a power supply circuit and a dual-plane redundant power supply system.

[0005] According to a first aspect of the present application, a power supply circuit is provided, comprising: an output voltage generation module configured to convert an output current provided by the power supply circuit to a load into an output voltage; a current sharing control module configured to generate a current sharing control voltage for adjusting a reference voltage of a remote sampling point according to a comparison result obtained by comparing the output voltage and a current sharing voltage of a current sharing bus, the remote sampling point being located at the load side; a feedback voltage generation module configured to generate a feedback voltage according to a remote feedback voltage, a near-end feedback voltage and a resonance voltage, the remote feedback voltage being a voltage of the remote sampling point, the near-end feedback voltage being a voltage of a near-end sampling point located at an output end of the power supply circuit, a difference between the remote feedback voltage and the near-end feedback voltage being used to compensate for a line voltage drop between the output end of the power supply circuit and the remote sampling point, and the resonance voltage indicating a resonance oscillation state of a resonance converter in the power supply circuit; and a voltage adjustment module configured to adjust the reference voltage according to the current sharing control voltage, compare the feedback voltage with the adjusted reference voltage to obtain an error voltage, and adjust the output voltage of the power supply circuit according to the error voltage.

[0006] The second aspect of the present application provides a dual-plane redundant power supply system, comprising: a first power supply plane, the first power supply plane comprising at least one parallel power supply circuit; a second power supply plane, the second power supply plane comprising at least one parallel power supply circuit; a power supply isolation module, a first end of the power supply isolation module being electrically connected with an output end of the first power supply plane and an output end of the second power supply plane, a second end of the power supply isolation module being electrically connected with a first end of a load isolation module, for supplying power to a load by a power supply circuit of another power supply plane in the case that a power supply circuit of any one of the first power supply plane or the second power supply plane is abnormal; and a load isolation module, a second end of the load isolation module being electrically connected with an input end of at least one load, for disconnecting the connection between the load and the power supply isolation module in the case that the load is abnormal.

[0007] According to the power supply circuit provided by the present application, the feedback voltage is generated based on the remote feedback voltage and the near-end feedback voltage, which can compensate for the line voltage drop between the output end of the power supply circuit and the remote sampling point, so as to eliminate the influence of printed board layout wiring difference on power supply reliability; the feedback voltage is generated based on the resonance voltage, which can utilize the micro characteristics of the resonance current to eliminate the influence of source effect on current sharing accuracy. On this basis, the error voltage obtained based on the current sharing control voltage, the feedback voltage and the reference voltage is used to adjust the output voltage of the power supply circuit, so that the adjustment of the output voltage of the power supply circuit is more accurate when current sharing is realized, that is, the adjustment step of the output voltage is accurate. Therefore, the current sharing accuracy is improved by adjusting the output voltage of the power supply circuit, the ORING abnormal shutdown of the output end of the power supply circuit is reduced, and the power supply stability is improved. BRIEF DESCRIPTION OF DRAWINGS

[0008] Figure 1 A schematic diagram of a power supply circuit according to an embodiment of the present application is shown;

[0009] Figure 2 A structural schematic diagram of a resonance sampling module according to an embodiment of the present application is shown;

[0010] Figure 3 A structural schematic diagram of a remote sampling module according to an embodiment of the present application is shown;

[0011] Figure 4 A structural schematic diagram of a current sharing control module according to an embodiment of the present application is shown;

[0012] Figure 5 A structural schematic diagram of a voltage generation module according to an embodiment of the present application is shown;

[0013] Figure 6 A structural schematic diagram of a dual-plane redundant power supply system according to an embodiment of the present application is shown;

[0014] Figure 7 A structural diagram of a dual-plane redundant power supply system according to another embodiment of the present application is shown. DETAILED DESCRIPTION

[0015] Hereinafter, embodiments of the present application will be described with reference to the accompanying drawings. It should be understood, however, that the description which follows is merely exemplary and is not intended to limit the scope of the application. In the following detailed description of embodiments of the present application, numerous specific details are set forth in order to provide a thorough understanding of the present application. However, it will be apparent to one skilled in the art that one or more embodiments of the present application can be practiced without these specific details. In other instances, well-known structures and functions have not been described in detail in order to avoid obscuring aspects of the present application.

[0016] The terms used herein are merely used to describe specific embodiments and are not intended to limit the present application. The terms "include" and "have" and the like used herein indicate the presence of the described features, steps, operations, and / or components but do not preclude the presence or addition of one or more other features, steps, operations, or components.

[0017] All terms used herein, including technical and scientific terms, have the same meanings as those generally understood by those skilled in the art, unless otherwise defined. It should be noted that the terms used herein should be interpreted as having meanings consistent with the context of the present description, and should not be interpreted in an idealized or excessively formal manner.

[0018] In the case of using expressions similar to "at least one of A, B, and C, etc.", it should generally be interpreted to include at least one of the items enumerated, but not limited to the items enumerated (e.g., "a system having at least one of A, B, and C" should include a system having A alone, a system having B alone, a system having C alone, a system having A and B together, a system having A and C together, a system having B and C together, and / or a system having A, B, and C together, etc.).

[0019] In the related art, an ORING circuit is designed at the output end of a PSU to ensure that one PSU anomaly does not affect power supply to a load, but in the process of adjusting the current sharing accuracy in the power supply scenario, there is a problem of causing the ORING circuit to abnormally turn off, thereby causing problems such as instability of the power supply system.

[0020] To this end, the present application provides a current sharing control circuit, which improves the adjustment accuracy of the output voltage of the power supply circuit, accurately adjusts the step size of the output voltage, and reduces the abnormal turn-off of the ORING.

[0021] Figure 1 A schematic diagram of a power supply circuit according to an embodiment of the present application is shown.

[0022] AsFigure 1 As shown, the power supply circuit 100 comprises an output voltage generation module 110, a current sharing control module 120, a feedback voltage generation module 130 and a voltage regulation module 140.

[0023] In an embodiment, the power supply circuit 100 can be a PSU.

[0024] According to embodiments of the present application, the power supply circuit 100 can supply power to the load 150. The output voltage generation module 110 can be electrically connected with an output loop of the power supply circuit 100 to collect an output current provided by the power supply circuit 100 to the load 150, and to convert the output current provided by the power supply circuit 100 to the load 150 into an output voltage.

[0025] In an embodiment, an input end of the output voltage generation module 110 can be electrically connected with a current sampling point on the output loop of the power supply circuit 100 as shown in Figure 1

[0026] Wherein, the power supply circuit is used to convert input electric energy into a stable voltage required by the load to work, and a specific structure for converting the input electric energy into the stable voltage required by the load in the power supply circuit is not shown in the power supply circuit 100. Figure 1

[0027] According to embodiments of the present application, an input end of the current sharing control module 120 is electrically connected with an output end of the output voltage generation module 110, and the input end of the current sharing control module 120 is also electrically connected with the current sharing bus. Thus, the current sharing control module 120 is used to compare the output voltage and the current sharing voltage of the current sharing bus, and to generate a current sharing control voltage used to adjust the reference voltage of the remote sampling point according to a comparison result obtained by comparing the output voltage and the current sharing voltage of the current sharing bus. Wherein, the remote sampling point is located at the load side, i.e. the remote sampling point is located at the side of the load 150.

[0028] In an embodiment, the reference voltage of the remote sampling point located at the load side can represent the voltage of the output voltage of the power supply circuit before reaching the load through the cable, i.e. the reference voltage represents the actual power supply effect of the power supply circuit to the load.

[0029] In an embodiment, the output ends of the plurality of parallel power supply circuits 100 are all electrically connected with the current sharing bus, and the current sharing voltage of the current sharing bus follows the maximum output voltage in the plurality of parallel power supply circuits.

[0030] According to embodiments of the present application, the feedback voltage generation module 130 is used to generate a feedback voltage according to the remote feedback voltage, the near-end feedback voltage and the resonance voltage.

[0031] ​​Among them, the far-end feedback voltage is the voltage of the far-end sampling point, the near-end feedback voltage is the voltage of the near-end sampling point located at the output end of the power supply circuit, the difference between the far-end feedback voltage and the near-end feedback voltage is used to compensate for the line voltage drop between the output end of the power supply circuit and the far-end sampling point, and the resonant voltage is used to reflect the resonant oscillation state of the resonant converter in the power supply circuit.

[0032] For example, such as Figure 1 The sampling point shown is located on one side of load 150 and is a remote sampling point. For example... Figure 1 The sampling point located at the output terminal of the power supply circuit 100 shown is the near-end sampling point.

[0033] In one embodiment, the near-end feedback voltage characterizes the actual output voltage of the power supply circuit 100, and the far-end feedback voltage characterizes the actual voltage at which the output voltage of the power supply circuit 100 reaches the load 150 side.

[0034] According to an embodiment of this application, the input terminal of the voltage regulation module 140 is electrically connected to the output terminal of the current sharing control module 120 and the output terminal of the feedback voltage generation module 130, and is used to adjust the reference voltage according to the current sharing control voltage, compare the feedback voltage with the adjusted reference voltage to obtain the error voltage, and adjust the output voltage of the power supply circuit according to the error voltage.

[0035] Specifically, the voltage regulation module 140 can superimpose and regulate the current sharing control voltage and the reference voltage to obtain the regulated reference voltage, and compare the regulated reference voltage with the feedback voltage through the difference amplifier to obtain the error voltage.

[0036] In one embodiment, the power supply circuit 100 further includes a voltage control module, which adjusts the output voltage of the power supply circuit according to the error voltage. For example, the voltage control module can be a PWM (Pulse Width Modulation) controller.

[0037] Among them, such as Figure 1 The current sampling point and output terminal shown are both located on the output circuit of the power supply circuit 100.

[0038] According to the embodiments of the present application, the feedback voltage is generated based on the far-end feedback voltage and the near-end feedback voltage, which can compensate for the line voltage drop between the output end of the power supply circuit and the far-end sampling point to eliminate the influence of printed board layout wiring difference on power supply reliability; the feedback voltage is generated based on the resonance voltage, which can utilize the micro characteristics of the resonance current to eliminate the influence of source effect on current sharing accuracy. On this basis, the error voltage obtained based on the current sharing control voltage, the feedback voltage and the reference voltage is used to adjust the output voltage of the power supply circuit, so that the adjustment of the output voltage of the power supply circuit is more accurate when current sharing is implemented, that is, the adjustment step of the output voltage is more accurate. In this way, the current sharing accuracy is improved by adjusting the output voltage of the power supply circuit, the abnormal shutdown of the ORING connected to the output end of the power supply circuit is reduced, and the power supply stability is improved.

[0039] According to the embodiments of the present application, the power supply circuit further comprises at least one of the following: a far-end sampling module, a near-end sampling module and a resonance sampling module.

[0040] According to the embodiments of the present application, the input end of the far-end sampling module is electrically connected with the far-end sampling point, the output end of the far-end sampling module is electrically connected with the processor of the power supply circuit, and is used to obtain a far-end differential voltage pair from the far-end sampling point, convert the far-end differential voltage pair into a far-end single-end voltage, and transmit the far-end single-end voltage to the processor, so that the analog-to-digital converter of the processor samples the far-end single-end voltage to obtain the far-end feedback voltage.

[0041] According to the embodiments of the present application, the input end of the near-end sampling module is electrically connected with the near-end sampling point, the output end of the near-end sampling module is electrically connected with the processor of the power supply circuit, and is used to obtain a near-end single-end voltage from the near-end sampling point, transmit the near-end single-end voltage to the processor, so that the analog-to-digital converter of the processor samples the near-end single-end voltage to obtain the near-end feedback voltage.

[0042] According to the embodiments of the present application, the resonance sampling module is electrically connected with the resonance capacitor of the resonant converter, and is used to obtain the resonance voltage according to the voltage across the resonance capacitor.

[0043] In an embodiment, the output end of the processor electrically connected with the output end of the far-end sampling module, the output end of the processor electrically connected with the output end of the near-end sampling module, and the output end of the resonance sampling module are electrically connected with the input end of the feedback voltage generation module 130.

[0044] Figure 2 The structure schematic diagram of the resonance sampling module according to the embodiments of the present application is shown.

[0045] As Figure 2As shown, the two input terminals LLC_CT+ and LLC_CT- of the resonance sampling module are respectively electrically connected to both ends of the resonance capacitor of the resonance converter. The output terminal uC_Isense_CT of the resonance sampling module outputs the resonance voltage and is electrically connected to the input terminal of the feedback voltage generation module.

[0046] As shown, Figure 2 As shown, the signal input from the input terminal LLC_CT+ of the resonance sampling module is input into the positive input terminal of the differential amplifier P1 via the resistor R5 and the resistor R8; the signal input from the input terminal LLC_CT- is input into the positive input terminal of the differential amplifier P1 via the capacitor C2 and the resistor R8.

[0047] In an embodiment, one end of the resistor R6 is connected to Uc_AD, and the other end is connected to the capacitor C2; one end of the resistor R7 is electrically connected to the resistor R6, and the other end of the resistor R7 is grounded SGND_Uc_AD; one end of the capacitor C1 is grounded SGND_Uc_AD, and the other end is electrically connected to the resistor R6. Wherein, Uc_AD is a fixed voltage, which is used to supply power for the differential amplifier P1.

[0048] In an embodiment, one end of the resistor R9 is electrically connected to the negative input terminal of the differential amplifier P1, and the other end is electrically connected to the output terminal of the differential amplifier P1; one end of the capacitor C3 is electrically connected to the negative input terminal of the differential amplifier P1, and the other end is electrically connected to the output terminal of the differential amplifier P1.

[0049] In an embodiment, the output terminal of the differential amplifier P1 is electrically connected to the resistor R10, the other end of the resistor R10 is electrically connected to the capacitor C4, and the other end of the capacitor C4 is grounded SGND_Uc_AD.

[0050] In an embodiment, the connection end of the resistor R10 and the capacitor C4 serves as the output terminal of the resonance sampling module.

[0051] According to the embodiments of the present application, the remote feedback voltage is generated by the remote sampling module, the near feedback voltage is generated by the near sampling module, and the resonance voltage is generated by the resonance sampling module. Therefore, by inputting the remote feedback voltage, the near feedback voltage and the resonance voltage into the feedback voltage generation module, the feedback voltage can be generated for adjusting the output voltage of the power supply circuit, so that when adjusting the output voltage of the power supply circuit, the line voltage drop between the output terminal of the power supply circuit and the remote sampling point and the resonance oscillation state of the resonance converter are considered, thereby eliminating the influence of source effect and load effect on current sharing accuracy based on the micro characteristics of the resonance current. Moreover, since the resonance current is advanced, the differential feedforward compensation can be performed based on the resonance current to identify the influence of abnormal scenarios on redundant power supply in advance.

[0052] Figure 3A structure diagram of a remote sampling module according to an embodiment of the present application is shown.

[0053] According to an embodiment of the present application, the remote sampling module comprises a differential signal input end, a first differential amplifier and a signal output end.

[0054] As shown in Figure 3 , the differential signal input end comprises two input ends V_Remote_S- and V_Remote_S+, and the differential signal input end is electrically connected with remote sampling points on an output loop of a power supply circuit, for obtaining a remote differential voltage pair from the remote sampling points. Specifically, there are two remote sampling points on the output loop of the power supply circuit, and the input end V_Remote_S+ in the differential signal input end is electrically connected with a remote sampling point at a positive terminal of the output loop of the power supply circuit, and the input end V_Remote_S- in the differential signal input end is electrically connected with a remote sampling point at a negative terminal of the output loop of the power supply circuit.

[0055] The first differential amplifier A1 is electrically connected with the two input ends V_Remote_S- and V_Remote_S+ comprised in the differential signal input end, for differentially amplifying the remote differential voltage pair to obtain a remote single-end voltage.

[0056] Specifically, one remote differential voltage in the remote differential voltage pair input from the input end V_Remote_S- in the differential signal input end is input to a negative phase input end of the first differential amplifier A1 via the resistor R13 and the resistor R14, and the other remote differential voltage in the remote differential voltage pair input from the input end V_Remote_S+ in the differential signal input end is input to a positive phase input end of the first differential amplifier A1 via the resistor R11 and the resistor R12. The signal output end uC_V_EXT is electrically connected with an output end of the first differential amplifier, for transmitting the remote single-end voltage to a processor, so that an analog-to-digital converter of the processor samples the remote single-end voltage to obtain a remote feedback voltage.

[0057] Specifically, the output end of the first differential amplifier A1 is electrically connected with the signal output end uC_V_EXT via the resistor R17.

[0058] As shown in Figure 3 , one end of the capacitor C5 is grounded SGND_Uc_AD, the other end is electrically connected with the resistor R15 and electrically connected with the positive phase input end of the first differential amplifier A1, and the other end of the resistor R15 is grounded SGND_Uc_AD.

[0059] In an embodiment, one end of the resistor R16 is electrically connected to the negative phase input terminal of the first differential amplifier A1, and the other end is electrically connected to the output terminal of the first differential amplifier A1; one end of the capacitor C6 is electrically connected to the negative phase input terminal of the first differential amplifier A1, and the other end is electrically connected to the output terminal of the first differential amplifier A1.

[0060] According to an embodiment of the present application, one end of the capacitor C7 is grounded SGND_Uc_AD, and the other end is electrically connected to the resistor R17 and the diode D1, and the other end of the diode D1 is connected to Uc_AD. Wherein, Uc_AD is a fixed voltage.

[0061] In an embodiment, the resistor R11, the resistor R12 and the resistor R15 are used for voltage division; the capacitor C5, the capacitor C6 and the capacitor C7 are used for filtering. The diode D1 is used for clamping to prevent the output voltage of the remote sampling module from exceeding the fixed voltage +0.7V, and to protect the output terminal from being damaged by high voltage.

[0062] According to an embodiment of the present application, the voltage of the remote sampling point is collected by the remote sampling module as shown in Figure 3 , so that the line voltage drop between the output terminal of the power supply circuit and the remote sampling point can be compensated while the output voltage of the power supply circuit is adjusted, and the influence of the difference in printed circuit layout on the reliability of power supply is eliminated.

[0063] According to an embodiment of the present application, the current sharing control module comprises: a current sharing control unit, configured to generate a current sharing control voltage for increasing the reference voltage of the remote sampling point when the output voltage is less than the current sharing voltage of the current sharing bus, and generate a current sharing control voltage for decreasing the reference voltage of the remote sampling point when the output voltage is greater than the current sharing voltage of the current sharing bus.

[0064] According to an embodiment of the present application, the current sharing control module comprises a current sharing control unit, and the input of the current sharing control unit is the output voltage and the current sharing voltage of the current sharing bus, for judging the difference between the output voltage and the current sharing voltage, and generating the current sharing control voltage based on the difference between the output voltage and the current sharing voltage, for increasing the reference voltage of the remote sampling point or decreasing the reference voltage of the remote sampling point.

[0065] According to an embodiment of the present application, the current sharing control unit generates the current sharing control voltage based on the output voltage and the current sharing voltage of the current sharing bus, so that the reference voltage adjusted based on the current sharing control voltage can be aligned with the current sharing voltage, further improving the current sharing accuracy.

[0066] Figure 4 The structure diagram of the current sharing control module according to an embodiment of the present application is shown.

[0067] According to an embodiment of this application, the current sharing control unit includes: a weighted averaging subunit 410, a peak detection subunit 420, and a filtering and amplification subunit 430. For example... Figure 4 As shown, the weighted average subunit 410 includes resistors R18 and R19, which are used to perform weighted averaging of the output voltage and the current sharing voltage of the current sharing bus.

[0068] Specifically, the output voltage is input to the current sharing control unit through the Vsense_local terminal, and the current sharing voltage of the current sharing bus is input to the current sharing control unit through the uC_Ishare_Trim terminal.

[0069] In one embodiment, the output voltage input from the Vsense_local terminal is input to the non-inverting input of the differential amplifier P2 via resistor R18; the current sharing voltage input from the uC_Ishare_Trim terminal is input to the non-inverting input of the differential amplifier P2 via resistor R19.

[0070] like Figure 4 As shown, the peak detection subunit 420 includes resistor R22, diode D2, transistor Q1, resistor R24, resistor R25, resistor R26 and diode D3, which are used to detect the peak value of the weighted average voltage to obtain the peak voltage.

[0071] like Figure 4 As shown, the filter amplification subunit 430 includes resistors R20, R21, C9, R22, R23, R24, R25, R26, R27, and C10. It is used to generate a current sharing control voltage to increase the reference voltage of the far-end sampling point when the peak voltage is greater than a preset threshold, and to generate a current sharing control voltage to decrease the reference voltage of the far-end sampling point when the peak voltage is less than the preset threshold.

[0072] In one embodiment, one end of capacitor C8 is grounded to SGND_Uc_AD, and the other end is electrically connected to resistors R18 and R19 and the non-inverting input of differential amplifier P2.

[0073] In one embodiment, the output of the difference amplifier P2 is connected to the peak detection subunit 420.

[0074] In one embodiment, in the peak detection subunit 420, one end of resistor R22 is electrically connected to the output terminal of the difference amplifier P2, and the other end of resistor R22 is electrically connected to the gate of diode D2 and transistor Q1. The other end of diode D2 is electrically connected to one end of transistor Q1, and the other end of transistor Q1 is electrically connected to SVCC. One end of each of resistors R24, R25, and R26 is electrically connected to one end of diode D2, and the other end of each of resistors R24, R25, and R26 is electrically connected to diode D3.

[0075] In one embodiment, in the filter amplification subunit 430, one end of resistor R20 is grounded to SGND_Uc_AD, and the other end is electrically connected to the negative input terminal of the differential amplifier P2; one end of resistor R21 is electrically connected to the negative input terminal of the differential amplifier P2, and the other end is electrically connected to capacitor C9; the other end of capacitor C9 is electrically connected to the negative input terminal of the differential amplifier P2; one end of resistor R21 and capacitor C9 is electrically connected to one end of resistor R23; the other end of resistor R23 is electrically connected to resistor R27 and capacitor C10; the other end of resistor R27 is grounded to SGND_Uc_AD, and resistor R27 is also electrically connected to diode D3; the other end of capacitor C10 is grounded to SGND_Uc_AD.

[0076] According to an embodiment of this application, the current sharing control unit is used to generate a current sharing control voltage for controlling the increase or decrease of the reference voltage at the far-end sampling point by detecting the weighted average voltage based on the output voltage and the current sharing bus, thereby realizing the current sharing of the power supply circuit.

[0077] According to an embodiment of this application, the current sharing control module further includes: an isolating switch unit 440.

[0078] like Figure 4 As shown, the isolating switch unit 440 includes resistors R28 and R29, capacitor C11, transistors Q2, Q3, and Q4, and is connected between the current sharing control unit and the current sharing bus. It is used to control the isolating switch unit to disconnect in the event of abnormal operation of the power supply circuit, so as to isolate the power supply circuit from the current sharing bus.

[0079] In one embodiment, one end of resistor R28 is connected to SVCC, and the other end is electrically connected to resistor R29. The other end of resistor R29 is grounded to SGND_Uc_AD. One end of capacitor C11 is electrically connected to resistor R29, and the other end is grounded to SGND_Uc_AD. One end of transistor Q4 is grounded to SGND_Uc_AD, and the other end is electrically connected to resistor R28. The gate of transistor Q4 is electrically connected to the control unit. The control unit can be an MCU. The gate of transistor Q4 can serve as the input terminal of the isolation switch unit 440, that is, the gate of transistor Q4 can serve as the input terminal uC_Ishare_EN of the control signal of the control unit.

[0080] In one embodiment, the gates of transistors Q2 and Q3 are electrically connected to transistor Q4. One end of transistor Q2 is electrically connected to resistor R23, capacitor C10, and resistor R27, and the other end of transistor Q2 is electrically connected to transistor Q3. The other end of transistor Q3 serves as the output terminal of the isolating switch unit 440, that is, the other end of transistor Q3 serves as the output terminal ISHARE of the current sharing control module.

[0081] According to the embodiment of the present application, in the case of abnormal operation of the power supply circuit, the control unit can send a control signal to the transistor Q4, which can control the transistor Q4 to open, on the basis of which the transistor Q2 and the transistor Q3 will also close, that is, the disconnector unit is disconnected, so as to isolate the power supply circuit from the current sharing bus.

[0082] In an embodiment, the transistor Q1 and the transistor Q4 are NPN type, and the transistor Q2 and the transistor Q3 are NMOS (N-type Metal-Oxide-Semiconductor) tubes.

[0083] According to the embodiment of the present application, in the case of abnormal operation of the power supply circuit, the control unit will output a control signal, and the transistor Q4 will open under the drive of the control signal, and then drive the transistor Q2 and the transistor Q3 to close, so as to quickly cut off the electrical connection between the power supply circuit and the current sharing bus, eliminate the influence of the abnormal power supply circuit on the current sharing bus, prevent one power supply circuit from affecting the current sharing effect, and achieve the purpose of current sharing redundant power supply.

[0084] According to the embodiment of the present application, the feedback voltage generation module is configured to: generate a voltage drop compensation voltage for compensating for a voltage drop between an output end of the power supply circuit and a far-end sampling point according to a difference between the far-end feedback voltage and the near-end feedback voltage; generate a dynamic feed-forward voltage for optimizing a transient response of the power supply circuit according to the resonance voltage; and generate the feedback voltage according to the voltage drop compensation voltage and the dynamic feed-forward voltage.

[0085] Specifically, the feedback voltage is obtained by differentiating and comprehensively processing the far-end feedback voltage, the near-end feedback voltage and the resonance voltage.

[0086] According to the embodiment of the present application, the feedback voltage is generated by the far-end feedback voltage, the near-end feedback voltage and the resonance voltage. Based on the compensation of the near-end feedback voltage and the far-end feedback voltage, the influence of the double-plane power supply layout and the wiring difference on the power supply reliability is considered; based on the resonance voltage, the differential characteristics of the resonance current are considered. Therefore, the error voltage obtained based on the feedback voltage to adjust the output voltage of the power supply voltage can eliminate the influence of the layout and wiring on the power supply reliability, and solve the influence of the source effect and the load effect on the current sharing accuracy.

[0087] Figure 5 A structure diagram of a voltage generation module according to an embodiment of the present application is shown.

[0088] According to the embodiment of the present application, the power supply circuit further comprises an output voltage generation module.

[0089] As Figure 5As shown, the output voltage generation module includes: a first resistor R1, a second resistor R2, a second differential amplifier A2, a third resistor R3, and a fourth resistor R4.

[0090] Specifically, the first resistor R1 has its first terminal I+ electrically connected to the positive terminal of the current output loop of the power supply circuit, and its second terminal is electrically connected to the non-inverting input terminal IN+ of the second differential amplifier A2.

[0091] The second resistor R2 has its first terminal I- electrically connected to the negative terminal of the current output loop of the power supply circuit, and its second terminal is electrically connected to the negative inverting input terminal IN- of the second differential amplifier A2.

[0092] The second differential amplifier A2 has its reference terminal REF electrically connected to the first terminal of the third resistor R3 and the first terminal of the fourth resistor R4. The output terminal OUT of the second differential amplifier A2 is electrically connected to the input terminal of the current sharing control module, which is used to adjust the output voltage within the target voltage range according to the resistance values ​​of the third resistor R3 and the fourth resistor R4.

[0093] The second terminal of the third resistor R3 is electrically connected to the auxiliary power supply SVCC. The second terminal of the fourth resistor R4 is grounded to SGND_Uc_AD.

[0094] like Figure 5 As shown, one end of capacitor C11 is grounded to SGND_Uc_AD, and the other end is electrically connected to the positive power supply terminal V+ of the second differential amplifier A2. The auxiliary power supply SVCC is also electrically connected to the positive power supply terminal V+ of the second differential amplifier A2 to supply power to the second differential amplifier A2.

[0095] In one embodiment, the output terminal of the second differential amplifier A2 is electrically connected to the input terminal of the current sharing control module via resistor R30, that is, one end of resistor R30 serves as the output terminal Vsense_local of the output voltage generation module.

[0096] Specifically, resistors R1 and R2 are used to sample the output current of the power supply circuit. Based on the principle of Shannon's formula, the sampling accuracy is highest within the sampling interval of [1 / 3, 2 / 3]. Therefore, by adjusting the resistance values ​​of resistors R3 and R4, the output voltage is made to be within the target voltage range.

[0097] According to embodiments of this application, by means of... Figure 5 The output voltage generation module shown can collect the output current of the power supply circuit, convert the output current into voltage, and on this basis, make the output voltage fall within the target voltage range to improve sampling accuracy.

[0098] Figure 6A structure diagram of a dual-plane redundant power supply system according to an embodiment of the present application is shown.

[0099] As shown in Figure 6 the dual-plane redundant power supply system includes a first power supply plane 610, a second power supply plane 620, a power supply isolation module 630 and a load isolation module 640 arranged in front of a load 650.

[0100] In an embodiment, the first power supply plane 610 can include at least one parallel power supply circuit, such as the first power supply plane 610 including parallel power supply circuits 1, …, power supply circuit N; the second power supply plane 620 can include at least one parallel power supply circuit, such as the second power supply plane 620 including parallel power supply circuits 1, …, power supply circuit N.

[0101] In an embodiment, the number of power supply circuits in the first power supply plane 610 and the second power supply plane 620 is the same.

[0102] The first end of the power supply isolation module 630 is electrically connected to the output end of the first power supply plane 610 and the output end of the second power supply plane 620, and the second end of the power supply isolation module 630 is electrically connected to the first end of the load isolation module 640, for supplying power to the load 650 by the power supply circuit of the other power supply plane in the case of abnormality of the power supply circuit of any power supply plane of the first power supply plane 610 or the second power supply plane 620.

[0103] The second end of the load isolation module 640 is electrically connected to the input end of at least one load 650, for disconnecting the connection between the load 650 and the power supply isolation module 630 in the case of abnormality of the load 650.

[0104] According to an embodiment of the present application, sampling point 1 can be a far-end sampling point for the first power supply plane 610, and sampling point 2 can be a far-end sampling point for the second power supply plane 620, that is, in the current sharing control process, current sharing control is performed for each power supply plane respectively.

[0105] According to an embodiment of the present application, since dual-plane power supply is adopted, in the case of abnormality of a certain power supply circuit, the work will not be affected. Moreover, based on the current sharing control of the power supply circuit, current sharing control of the dual-plane redundant power supply can be realized.

[0106] Figure 7 A structure diagram of a dual-plane redundant power supply system according to another embodiment of the present application is shown.

[0107] As shown in Figure 7As shown, taking an example where both the first power supply plane and the second power supply plane include two power supply circuits and supply power to four loads, power supply circuit 1 and power supply circuit 2 serve as the first power supply plane, and power supply circuit 3 and power supply circuit 4 serve as the second power supply plane.

[0108] According to embodiments of this application, a power isolation module may include: a group of unidirectional conducting elements adapted to at least one load.

[0109] like Figure 7 As shown, the power isolation module may include multiple unidirectional conducting element groups 710. Each unidirectional conducting element group 710 corresponds one-to-one with a load.

[0110] According to an embodiment of this application, a unidirectional conducting element group may include a first unidirectional conducting element and a second unidirectional conducting element. The first end of the first unidirectional conducting element is electrically connected to the output end of a first power supply plane, and the first end of the second unidirectional conducting element is electrically connected to the output end of a second power supply plane. The first unidirectional conducting element is used to cut off when the voltage at its first end is less than the voltage at its second end, allowing the power supply circuit of the second power supply plane to supply power to the loads (e.g., load 1, load 2, load 3, load 4). The second unidirectional conducting element is used to cut off when the voltage at its first end is less than the voltage at its second end, allowing the power supply circuit of the first power supply plane to supply power to the loads (e.g., load 1, load 2, load 3, load 4).

[0111] In one embodiment, the unidirectional conduction element may be ORING.

[0112] According to an embodiment of this application, the load isolation module may include: a fuse adapted to at least one load, a first end of the fuse being electrically connected to the second end of a first unidirectional conducting element and the second end of a second unidirectional conducting element in a unidirectional conducting element group adapted to the same load, and a second end of the fuse being electrically connected to the input end of the load. The fuse is used to disconnect the connection between the load and the unidirectional conducting element group in the event of a load abnormality.

[0113] In one embodiment, the load isolation module corresponds one-to-one with the load. In one embodiment, the fuse can be an EFUSE (Electronic Fuse).

[0114] like Figure 7As shown, the load inlet is designed with ORING+EFUSE circuit, i.e. one-way conduction element and load isolation module, to replace the existing EFUSE+ORING circuit, to simplify the existing hot plug protection circuit, the number of EFUSE is reduced by half, the number of ORING remains unchanged, the influence of controller exception on double-plane power supply is eliminated, the inlet ORING circuit prevents one power plane from affecting the power supply of another plane, and the EFUSE is broken, which does not affect the ORING current sharing.

[0115] According to the embodiments of the present application, ORING can judge the front and rear voltages, and will be turned off when the rear voltage is greater than the front voltage. However, if the output voltage of the power supply circuit is adjusted too large during current sharing regulation, it will cause ORING to be abnormally turned off. Based on the current sharing control of the power supply circuit of the present application, the accuracy of current sharing control is improved, which makes the adjustment step of the output voltage more accurate, thereby reducing the abnormal turn-off of ORING connected to the output end of the power supply circuit.

[0116] Based on Figure 7 As shown in the double-plane redundant power supply system, the double-plane power supply realizes 2+2 redundancy, i.e. any two power supply circuits (PSU) are abnormal, which does not affect the load work.

[0117] Based on the power supply circuit of the present application, based on the peak detection subunit, the peak current sharing control algorithm is adopted, so that the power supply circuit is cut off from the current sharing bus when it works abnormally, to prevent the abnormal power supply circuit from affecting the current sharing accuracy and the reliability of redundant power supply, and to realize double-plane redundant power supply. Based on the remote sampling module and the near-end sampling module, the remote sampling compensation of output voltage is introduced, so as to calculate the output impedance characteristics according to the difference between the remote sampling and the near-end sampling, to eliminate the influence of layout and wiring and connector parameter difference on the reliability of double-plane power supply. And based on the resonance sampling module, the resonance voltage is introduced, so as to introduce the resonance current feedforward disturbance algorithm according to the resonance current differential characteristics, to prevent the abnormal turn-off of ORING circuit during current sharing adjustment in abnormal scenarios.

[0118] In an embodiment, the reference voltage is corrected according to the difference between the output voltage converted from the output current of the power supply circuit and the current sharing voltage of the current sharing bus, i.e. the reference voltage is adjusted based on the current sharing control voltage; the outer droop parallel output impedance method is to disturb the feedback voltage according to the change rule of the difference between the near-end sampling and the remote sampling.

[0119] Based on this, the maximum current method automatic current sharing and the outer droop parallel output impedance method in the power supply circuit of the present application are combined to adjust the output voltage of the power supply circuit according to the reference voltage and the feedback voltage PI (Proportional-Integral).

[0120] Considering the influence of double-plane power supply layout and wiring difference on power supply reliability, the outer sag parallel output impedance method is introduced in the application to eliminate the influence of layout and wiring on power supply reliability. Specifically, through near-end sampling and far-end sampling, the resistance difference of the power supply link can be known according to the sampling difference, and compensation based on the difference can ensure better balance accuracy.

[0121] Considering the differential characteristic of resonant current as a feedforward disturbance, the source effect and load effect current sharing adjustment caused ORING abnormal shutdown problem is solved. Specifically, the resonant voltage is obtained based on the resonant module in the application to generate the feedback voltage.

[0122] In an embodiment, according to the power supply loop stability and application scenario, the current sharing compensation, output impedance difference compensation, and load change feedforward disturbance are limited in amplitude, and the compensation amplitude does not exceed 5% of the set value, and the disturbance amplitude does not exceed 0.5% of the set value.

[0123] Therefore, the power supply system has the following advantages: all-digital intelligent control algorithm, current sharing compensation, output impedance characteristic compensation, resonant current feedforward disturbance, and intelligent control purpose. Double-plane power supply realizes real redundancy power supply, and the power supply link short circuit and the storage node work normally. The power supply link is safe and reliable, and the data loss hidden danger of downtime is eliminated. The power supply link topology is simplified, and the material cost is saved. The power supply reliability is improved, and the after-sales service cost is saved.

[0124] According to the embodiments of the application, the program code for executing the computer programs provided by the embodiments of the application can be written in any combination of one or more programming languages, and specifically, the computer programs can be implemented by using high-level procedural and / or object-oriented programming languages, and / or assembly / machine languages. The programming language includes but is not limited to, for example, Java, C++, python, "C" language or similar programming language. The program code can be completely executed on a user computing device, partially executed on a user device, partially executed on a remote computing device, or completely executed on a remote computing device or server. In the case involving a remote computing device, the remote computing device can be connected to the user computing device through any kind of network, including a local area network (LAN) or a wide area network (WAN), or can be connected to an external computing device (for example, connected to the Internet through an Internet service provider).

[0125] The computer program product of the first aspect can include a computer readable storage medium. The computer readable storage medium can be a tangible computer readable storage medium storing the program code. The computer readable storage medium can include, but is not limited to, magnetic storage, optical storage, and the like. The computer readable storage medium can be non-transitory. The computer readable storage medium can be a non-transitory computer readable medium. The above general description or the following detailed description can use "computer readable storage medium", "computer readable medium", or similar term. These terms are used interchangeably. These terms are used to broadly convey that the medium is tangible.

[0126] Those skilled in the art can understand that the features described in various embodiments of the present application can be combined and / or integrated in various combinations, even if such combinations or integrations are not expressly described in the present application. In particular, the features described in various embodiments of the present application can be combined and / or integrated in various combinations without departing from the spirit and teachings of the present application. All such combinations and / or integrations are within the scope of the present application.

[0127] The above describes embodiments of the present application. However, these embodiments are for illustrative purposes only, and are not intended to limit the scope of the present application. Although each embodiment is described above separately, this does not mean that the measures in each embodiment cannot be used advantageously in combination. Those skilled in the art can make various alternatives and modifications without departing from the scope of the present application, and these alternatives and modifications shall fall within the scope of the present application.

Claims

1. A power supply circuit, characterized by comprising: The power supply circuit comprises: an output voltage generation module configured to convert an output current provided by the power supply circuit to a load into an output voltage; a current sharing control module configured to generate a current sharing control voltage for adjusting a reference voltage of a remote sampling point according to a comparison result obtained by comparing the output voltage and a current sharing voltage of a current sharing bus, the remote sampling point being located at the load side; wherein the current sharing control module comprises a current sharing control unit, and the current sharing control unit comprises: a weighted average subunit configured to perform weighted average on the output voltage and the current sharing voltage of the current sharing bus; a peak detection subunit configured to perform peak detection on the voltage after weighted average to obtain a peak voltage; a filter amplification subunit configured to generate the current sharing control voltage for increasing the reference voltage of the remote sampling point when the peak voltage is greater than a preset threshold, and generate the current sharing control voltage for decreasing the reference voltage of the remote sampling point when the peak voltage is less than the preset threshold; a feedback voltage generation module configured to generate a feedback voltage according to a remote feedback voltage, a near-end feedback voltage and a resonance voltage, the remote feedback voltage being a voltage of the remote sampling point, the near-end feedback voltage being a voltage of a near-end sampling point located at an output end of the power supply circuit, a difference between the remote feedback voltage and the near-end feedback voltage being used to compensate for a line voltage drop between the output end of the power supply circuit and the remote sampling point, and the resonance voltage representing a resonance oscillation state of a resonance converter in the power supply circuit; a voltage regulation module configured to adjust the reference voltage according to the current sharing control voltage, compare the feedback voltage with the adjusted reference voltage to obtain an error voltage, and adjust the output voltage of the power supply circuit according to the error voltage.

2. The power supply circuit according to claim 1, characterized in that, The power supply circuit further comprises at least one of: a remote sampling module, an input end of the remote sampling module being electrically connected to the remote sampling point, and an output end of the remote sampling module being electrically connected to a processor of the power supply circuit, the remote sampling module being configured to obtain a remote differential voltage pair from the remote sampling point, convert the remote differential voltage pair into a remote single-end voltage, and transmit the remote single-end voltage to the processor so that an analog-to-digital converter of the processor samples the remote single-end voltage to obtain the remote feedback voltage; a near-end sampling module, an input end of the near-end sampling module being electrically connected to the near-end sampling point, and an output end of the near-end sampling module being electrically connected to the processor of the power supply circuit, the near-end sampling module being configured to obtain a near-end single-end voltage from the near-end sampling point, and transmit the near-end single-end voltage to the processor so that the analog-to-digital converter of the processor samples the near-end single-end voltage to obtain the near-end feedback voltage; a resonance sampling module, the resonance sampling module being electrically connected to both ends of a resonance capacitor of the resonance converter, and the resonance sampling module being configured to obtain the resonance voltage according to voltages at both ends of the resonance capacitor.

3. The power supply circuit of claim 2, wherein, The remote sampling module comprises: a differential signal input end, the differential signal input end being electrically connected to the remote sampling point and being configured to obtain a remote differential voltage pair from the remote sampling point. a first differential amplifier electrically connected with the differential signal input terminal, configured to perform differential amplification on the remote differential voltage pair to obtain the remote single-end voltage; a signal output terminal electrically connected with an output terminal of the first differential amplifier, configured to transmit the remote single-end voltage to the processor, so that an analog-to-digital converter of the processor samples the remote single-end voltage to obtain the remote feedback voltage.

4. The power supply circuit of claim 1, wherein, The current-sharing control module further comprises: an isolating switch unit connected between the current-sharing control unit and the current-sharing bus, configured to control the isolating switch unit to be disconnected to isolate the power supply circuit from the current-sharing bus in the case of abnormal operation of the power supply circuit.

5. The power supply circuit according to any one of claims 1 to 3, characterized by The feedback voltage generation module is configured to: generate, according to a difference between the remote feedback voltage and the near-end feedback voltage, a voltage drop compensation voltage for compensating for a voltage drop between an output terminal of the power supply circuit and the remote sampling point; generate, according to the resonant voltage, a dynamic feed-forward voltage for optimizing a transient response of the power supply circuit; generate the feedback voltage according to the voltage drop compensation voltage and the dynamic feed-forward voltage.

6. The power supply circuit according to any one of claims 1 to 3, characterized by The output voltage generation module comprises: a first resistor, a first end of the first resistor being electrically connected with a positive terminal of a current output loop of the power supply circuit, and a second end of the first resistor being electrically connected with a positive-phase input terminal of a second differential amplifier; a second resistor, a first end of the second resistor being electrically connected with a negative terminal of the current output loop of the power supply circuit, and a second end of the second resistor being electrically connected with a negative-phase input terminal of the second differential amplifier; the second differential amplifier, a reference terminal of the second differential amplifier being electrically connected with a first end of a third resistor and a first end of a fourth resistor, and an output terminal of the second differential amplifier being electrically connected with an input terminal of the current-sharing control module, configured to adjust the output voltage within a target voltage interval according to a resistance value of the third resistor and a resistance value of the fourth resistor; a second end of the third resistor being electrically connected with an auxiliary power supply; a second end of the fourth resistor being grounded.

7. A dual plane redundant power supply system, characterized by, comprises: a first power supply plane, the first power supply plane comprising at least one parallel power supply circuit as claimed in any one of claims 1-6; a second power supply plane, the second power supply plane comprising at least one parallel power supply circuit as claimed in any one of claims 1-6; a power supply isolation module, a first end of the power supply isolation module being electrically connected with output terminals of the first power supply plane and the second power supply plane, and a second end of the power supply isolation module being electrically connected with a first end of a load isolation module, configured to supply power to a load by a power supply circuit of another power supply plane in the case of abnormality of any one of the power supply circuits of the first power supply plane or the second power supply plane; a load isolation module, a second end of the load isolation module being electrically connected with input terminals of at least one load, configured to disconnect the load from the power supply isolation module in the case of abnormality of the load.

8. The dual plane redundant power supply system of claim 7, wherein, The power supply isolation module comprises: A unidirectional conduction element group adapted to each of the at least one load, the unidirectional conduction element group comprising a first unidirectional conduction element and a second unidirectional conduction element, a first end of the first unidirectional conduction element being electrically connected to an output end of the first power supply plane, a first end of the second unidirectional conduction element being electrically connected to an output end of the second power supply plane, the first unidirectional conduction element being configured to be turned off when a voltage at the first end of the first unidirectional conduction element is less than a voltage at a second end of the first unidirectional conduction element, the load being powered by a power supply circuit of the second power supply plane, the second unidirectional conduction element being configured to be turned off when a voltage at the first end of the second unidirectional conduction element is less than a voltage at a second end of the second unidirectional conduction element, the load being powered by a power supply circuit of the first power supply plane; The load isolation module comprises: A fuse adapted to each of the at least one load, a first end of the fuse being electrically connected to a second end of the first unidirectional conduction element and a second end of the second unidirectional conduction element in the unidirectional conduction element group adapted to the same load, a second end of the fuse being electrically connected to an input end of the load, the fuse being configured to disconnect the connection between the load and the unidirectional conduction element group in the case of an abnormality of the load.

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