Series-parallel interleaved compatible current sharing control device, source-carrying system and equipment

Abstract

The present application discloses a series-parallel interleaved compatible current sharing control device, source-carrying system and equipment. The device includes a series interleaved current sharing control unit, which is used to output a first current sharing control signal of a series interleaved BUCK circuit; a parallel current sharing control unit, which is used to output a second current sharing control signal of a parallel BUCK circuit; a switch switching module, wherein the PWM signal output end of the series interleaved current sharing control unit and the PWM signal output end of the parallel current sharing control unit are respectively connected to the input end of the switch switching module; and a control module, wherein the control module is connected to the control end of the switch switching module to switch the output of the first current sharing control signal and the second current sharing control signal according to the corresponding BUCK circuit. It is compatible with the current sharing control of parallel BUCK circuits and series interleaved BUCK circuits, and can simultaneously meet current sharing and synchronization.

Description

Technical Field

[0001] The present application relates to the field of source-carrying systems, and in particular to a series-parallel interleaved compatible current sharing control device, a source-carrying system and equipment. Background Art

[0002] The source-load system integrates the functional characteristics of bidirectional and regenerative loads, and is widely used in new energy vehicles, lithium battery energy storage, motor drives, battery simulation, photovoltaic simulation, energy storage systems and other fields.

[0003] In the related art, the source-carrying system is usually composed of an input electromagnetic interference (EMI-ElectromagneticInterference) filter module, a power factor correction (PFC-Power Factor Correction) module, a buck (BUCK) circuit and an output filter module. The source-carrying system can use a parallel BUCK circuit to increase the output current and reduce the output ripple. A series boost BUCK circuit can also be used. The source-carrying system can be equipped with different BUCK circuits according to different application scenarios, but different current sharing control devices need to be selected according to different BUCK circuits. The existing current sharing control device cannot achieve compatibility between the series BUCK circuit and the parallel BUCK circuit. In addition, if the BUCK circuit uses multi-phase interleaving and series boost at the same time, the existing current sharing control device cannot meet the current sharing and synchronization at the same time. Summary of the invention

[0004] The present application proposes a series-parallel interleaved compatible current sharing control device, source-load system and equipment, which are compatible with the current sharing control of parallel BUCK circuits and series interleaved BUCK circuits, and can simultaneously meet the requirements of current sharing and synchronization.

[0005] According to the first aspect of the present application, the series-parallel interleaved compatible current sharing control device is connected to the series interleaved BUCK circuit or the parallel BUCK circuit, including:

[0006] A series interleaved current sharing control unit, the series interleaved current sharing control unit is used to output a first current sharing control signal of a series interleaved BUCK circuit; a parallel current sharing control unit, the parallel current sharing control unit is used to output a second current sharing control signal of a parallel BUCK circuit; a switch switching module, the PWM signal output end of the series interleaved current sharing control unit and the PWM signal output end of the parallel current sharing control unit are respectively connected to the input end of the switch switching module; a control module, the control module is connected to the control end of the switch switching module for switching the output of the first current sharing control signal and the second current sharing control signal according to the corresponding BUCK circuit.

[0007] According to some embodiments of the present application, the series interleaved BUCK circuit includes a plurality of first BUCK modules connected in series, each of the first BUCK modules includes an A-phase BUCK circuit and a B-phase BUCK circuit arranged in parallel and interleaved, and the series interleaved current sharing control unit includes a current sampling module, a current selection module, a given value input module, a first feedback control loop and a second feedback control loop;

[0008] The current sampling module is used to obtain the A-phase current and the B-phase current of each first BUCK module, and the output end of the current sampling module is connected to the input end of the current selection module;

[0009] The current selection module is used to compare the magnitudes of the A-phase current and the B-phase current in each first BUCK module, and obtain the max-phase BUCK circuit and the min-phase BUCK circuit corresponding to each first BUCK module according to the comparison result, wherein the max-phase BUCK circuit is a BUCK circuit with a larger current, and the min-phase BUCK circuit is a BUCK circuit with a smaller current;

[0010] The given value input module is used to obtain an average phase current, where the average phase current is the sum of all A-phase currents and all B-phase currents divided by two;

[0011] The output end of the current selection module is connected to the feedback end of the first feedback control loop so as to use the current of all max-phase BUCK circuits as the feedback value of the first feedback control loop; the output end of the current selection module is connected to the feedback end of the second feedback control loop so as to use the current of all min-phase BUCK circuits as the feedback value of the second feedback control loop; the given value input module is respectively connected to the given value input ends of the first feedback control loop and the second feedback control loop so as to use the average phase current as the given value of the first feedback control loop and the second feedback control loop; the first feedback control loop is used to output a first PWM signal to control the current of all max-phase BUCK circuits according to the feedback value and the given value; the second feedback control loop is used to output a second PWM signal to control the current of all min-phase BUCK circuits according to the feedback value and the given value.

[0012] According to some embodiments of the present application, the switch switching module includes a first switch switching unit, the PWM signal output end of the first feedback control loop and the PWM signal output end of the second feedback control loop are both connected to the input end of the first switch switching unit, and multiple output ends of the first switch switching unit are respectively connected to the control end of each A-phase BUCK circuit and the B-phase BUCK circuit for switching the BUCK circuit corresponding to the first feedback control loop and the BUCK circuit corresponding to the second feedback control loop.

[0013] According to some embodiments of the present application, the series interleaved BUCK circuit also includes a voltage control loop, the first feedback control loop includes a first current equalizing loop and a first PWM modulation module, the second feedback control loop includes a second current equalizing loop and a second PWM modulation module, the output end of the voltage control loop is respectively connected to the first input end of the first PWM modulation module and the second PWM modulation module, the output end of the first current equalizing loop is connected to the second input end of the first PWM modulation module, the output end of the second current equalizing loop is connected to the second input end of the second PWM modulation module, the first PWM modulation module is used to output a first PWM signal to control the current of all max-phase BUCK circuits; the second PWM modulation module is used to output a second PWM signal to control the current of all min-phase BUCK circuits.

[0014] According to some embodiments of the present application, the parallel BUCK circuit includes second BUCK modules connected in parallel with each other, the parallel current equalizing control unit includes a third current equalizing ring corresponding one-to-one to multiple second BUCK modules, and the output ends of the multiple third current equalizing rings are respectively connected to an input end of the switch switching module.

[0015] According to some embodiments of the present application, the switch switching module includes a first switch switching unit and a second switch switching unit, the output ends of the series staggered current equalizing control unit and part of the third current equalizing ring are both connected to the input end of the first switch switching unit, and the output end of the first switch switching unit and the output end of another part of the third current equalizing ring are both connected to the input end of the second switch switching unit.

[0016] According to some embodiments of the present application, the second switch switching unit is further provided with a plurality of delay compensation switches for making the number of switches passed by each PWM signal consistent.

[0017] According to the source-load system of the second aspect embodiment of the present application, it includes a BUCK circuit and the above-mentioned series-parallel interleaved compatible current sharing control device, the signal output end of the series-parallel interleaved compatible current sharing control device is connected to the control end of the BUCK circuit, and the BUCK circuit is a series interleaved BUCK circuit or a parallel BUCK circuit.

[0018] An electronic device according to an embodiment of the third aspect of the present application includes a series interleaved BUCK circuit, a parallel BUCK circuit, a BUCK circuit switching module and the above-mentioned series-parallel interleaved compatible current sharing control device, wherein the BUCK circuit switching module is used to switch the operation of the series interleaved BUCK circuit and the parallel BUCK circuit, and the signal output end of the series-parallel interleaved compatible current sharing control device is respectively connected to the control end of the series interleaved BUCK circuit and the parallel BUCK circuit.

[0019] The series-parallel interleaved compatible current sharing control device, source-carrying system and equipment according to the embodiments of the present application have at least the following beneficial effects:

[0020] In the implementation manner of the present application, the synchronous current sharing control of the series interleaved BUCK circuit is realized by outputting the first current sharing control signal through the series interleaved current sharing control unit, and the synchronous current sharing control of the parallel BUCK circuit is realized by outputting the second current sharing control signal through the parallel current sharing control unit. The control module realizes the output switching of the first current sharing control signal and the second current sharing control signal through the switch switching module. When the source-load system runs the series interleaved BUCK circuit, the first current sharing control signal is input to the control end of the BUCK circuit. When the source-load system runs the parallel BUCK circuit, the second current sharing control signal is input to the control end of the BUCK circuit. The present application is compatible with the current sharing control of the parallel BUCK circuit and the series interleaved BUCK circuit, and can simultaneously meet the current sharing and synchronization requirements.

[0021] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The present application is further described below with reference to the accompanying drawings and embodiments, wherein:

[0023] Figure 1 It is a schematic diagram of a series interleaved BUCK circuit;

[0024] Figure 2 It is a schematic diagram of a parallel BUCK circuit;

[0025] Figure 3 A schematic diagram of a series-parallel interleaved compatible current sharing control device in an embodiment of the present application;

[0026] Figure 4 This is a circuit schematic diagram of a series-connected staggered current-sharing control unit in an embodiment of the present application;

[0027] Figure 5 Schematic diagram of the circuit of the parallel current sharing control unit in the embodiment of the present application;

[0028] Figure 6 Schematic diagram of the circuit of the switch switching module in the embodiment of the present application. DETAILED DESCRIPTION

[0029] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0030] In the description of the present application, it should be understood that the descriptions involving orientation, such as the orientation or positional relationship indicated as up, down, etc., are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0031] In the description of this application, "a plurality" means more than two. If there is a description of "first" or "second", it is only for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0032] In the description of this application, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in this application based on the specific content of the technical solution.

[0033] First, some nouns involved in this application are analyzed:

[0034] BUCK module / circuit: Also known as a step-down converter, it is a DC-DC converter used to convert a higher DC input voltage to a lower DC output voltage. It is one of the most common types of switching power supplies and is widely used in various electronic devices. It includes a main MOS tube Q1, which is used to control the switch of the main power path. A synchronous rectifier MOS tube Q2 is used to replace the traditional diode to reduce conduction losses. An inductor L is used to store energy and smooth the current during the switching cycle. And an output capacitor C is used to filter the output voltage and provide a stable DC output.

[0035] refer to Figure 1 As shown, the series interleaved BUCK circuit in the present application is a BUCK circuit of 3-stage BUCK series connection + 2-phase BUCK interleaved parallel connection, which is composed of six BUCK circuits, namely BUCK1, BUCK2, BUCK3, BUCK4, BUCK5, and BUCK6, which are connected in series and interleaved. Specifically, BUCK 1 and BUCK 2 are interleaved in parallel, BUCK 3 and BUCK4 are interleaved in parallel, BUCK5 and BUCK 6 are interleaved in parallel, BUCK 1 and BUCK 2 constitute BUCK module 1, BUCK 3 and BUCK4 constitute BUCK module 2, BUCK 5 and BUCK6 constitute BUCK module 3, and BUCK module 1, BUCK module 2, and BUCK module 3 are connected in series in sequence.

[0036] In order to achieve stable operation, the current sharing synchronization of the series interleaved BUCK circuit must meet the following requirements:

[0037] Current sharing: If I1~I6 are the inductor currents corresponding to BUCK1~BUCK6, then I1=I2, I3=I4, I5=I6, that is, the inductors of BUCK1 and BUCK2 share the current, the inductors of BUCK3 and BUCK4 share the current, and the inductors of BUCK5 and BUCK6 share the current.

[0038] Synchronization: BUCK1, BUCK3, and BUCK5 share a set of PWM signals, and BUCK2, BUCK4, and BUCK5 share a set of PWM signals, that is, PWM1=PWM3=PWM5, PWM2=PWM4=PWM6.

[0039] In summary, since the multi-phase interleaved BUCK circuit needs to consider the current sharing between each phase, and the series boost BUCK circuit needs to consider the synchronization of the switch tubes, if multi-phase interleaving and series boost are used at the same time, both current sharing and synchronization need to be met.

[0040] refer to Figure 2 As shown, the parallel BUCK circuit in the present application is composed of six BUCK circuits, BUCK1, BUCK2, BUCK3, BUCK4, BUCK5, and BUCK6, connected in parallel. In the parallel BUCK circuit, if I1~I6 are the internal inductance currents of the BUCK1-BUCK6 modules, then I1=I2=I3=I4=I5=I6 must be satisfied.

[0041] The source-load system integrates the functional characteristics of bidirectional and regenerative loads, and is widely used in new energy vehicles, lithium battery energy storage, motor drives, battery simulation, photovoltaic simulation, energy storage systems and other fields.

[0042] In the related art, the source-carrying system is usually composed of an input EMI filter module, a PFC module, a BUCK circuit and an output filter module. The source-carrying system can use a parallel BUCK circuit to increase the output current and reduce the output ripple. A series boost BUCK circuit can also be used. The source-carrying system can be equipped with different BUCK circuits according to different application scenarios. However, different current sharing control devices need to be selected according to different BUCK circuits. The existing current sharing control device cannot achieve compatibility between the series BUCK circuit and the parallel BUCK circuit. In addition, if the BUCK circuit uses multi-phase interleaving and series boost at the same time, the existing current sharing control device cannot meet the current sharing and synchronization at the same time.

[0043] In order to solve the above problems, the present application proposes a series-parallel interleaved compatible current sharing control device, which is connected to a series interleaved BUCK circuit or a parallel BUCK circuit. Figure 3As shown, the series-parallel interleaved compatible current sharing control device comprises: a series interleaved current sharing control unit, a parallel current sharing control unit and a switch switching module. Among them, the series interleaved current sharing control unit is used to output the first current sharing control signal of the series interleaved BUCK circuit; the parallel current sharing control unit is used to output the second current sharing control signal of the parallel BUCK circuit; the PWM signal output end of the series interleaved current sharing control unit and the PWM signal output end of the parallel current sharing control unit are respectively connected to the input end of the switch switching module; the control module is connected to the control end of the switch switching module to switch the output of the first current sharing control signal and the second current sharing control signal according to the corresponding BUCK circuit.

[0044] In the implementation manner of the present application, the synchronous current sharing control of the series interleaved BUCK circuit is realized by outputting the first current sharing control signal through the series interleaved current sharing control unit, and the synchronous current sharing control of the parallel BUCK circuit is realized by outputting the second current sharing control signal through the parallel current sharing control unit. The control module realizes the output switching of the first current sharing control signal and the second current sharing control signal through the switch switching module. When the source-load system runs the series interleaved BUCK circuit, the first current sharing control signal is input to the control end of the BUCK circuit. When the source-load system runs the parallel BUCK circuit, the second current sharing control signal is input to the control end of the BUCK circuit. The present application is compatible with the current sharing control of the parallel BUCK circuit and the series interleaved BUCK circuit, and can simultaneously meet the current sharing and synchronization requirements.

[0045] In this implementation, the control module may use a logic control device such as an MCU or a DSP, and perform switch switching by receiving a signal from a host computer or a button.

[0046] In this implementation, the first current sharing control signal refers to the PWM wave output by the series staggered current sharing control unit. Similarly, the second current sharing control signal refers to the PWM wave output by the parallel current sharing control unit.

[0047] In some embodiments of the present application, the series interleaved BUCK circuit includes a plurality of first BUCK modules connected in series, and each first BUCK module includes an A-phase BUCK circuit and a B-phase BUCK circuit arranged in parallel and interleaved. Specifically, the A-phase BUCK circuit is equivalent to the front-stage BUCK circuit in each first BUCK module, and the B-phase BUCK circuit is equivalent to the rear-stage BUCK circuit in the first BUCK module. Figure 1 As shown, the A-phase BUCK circuit in BUCK module 1 is BUCK1, and the B-phase BUCK circuit is BUCK2; similarly, the A-phase BUCK circuit in BUCK module 2 is BUCK3, and the B-phase BUCK circuit is BUCK4; the A-phase BUCK circuit in BUCK module 3 is BUCK5, and the B-phase BUCK circuit is BUCK6.

[0048] refer to Figure 4 As shown, the series staggered current sharing control unit includes a current sampling module, a current selection module, a given value input module, a first feedback control loop and a second feedback control loop. Among them, the current sampling module is used to obtain the A-phase current and the B-phase current of each BUCK module. Specifically, in this embodiment, the current sampling module samples the currents of all six BUCK circuits, that is, the inductor currents I1, I2, I3, I4, I5, and I6 are sampled, and the output end of the current sampling module is connected to the input end of the current selection module; the current selection module is used to compare the magnitude of the A-phase current and the B-phase current in each BUCK module, and obtain the max-phase BUCK circuit and the min-phase BUCK circuit corresponding to each BUCK module according to the comparison result, wherein the max-phase BUCK circuit is a BUCK circuit with a larger current, and the min-phase BUCK circuit is a BUCK circuit with a smaller current.

[0049] Specifically, the A-phase current and the B-phase current in each BUCK module are compared, and the max-phase BUCK circuit and the min-phase BUCK circuit corresponding to each BUCK module are obtained according to the comparison results. This means comparing the sizes of I1 and I2, I3 and I4, and I5 and I6 in the debugging stage. Then, the modules are grouped according to the comparison results. The phase with the larger current in each group is used as the max phase, and the phase with the smaller current is used as the min phase. The details are shown in Table 1:

[0050] Table 1 Comparison results grouping table

[0051]

[0052] The given value input module is used to obtain the average phase current, which is the sum of all A-phase currents and all B-phase currents divided by two. The purpose of obtaining the average phase current is to use it as the given value Iav1 of the first current balancing loop and the second current balancing loop. The expression of Iav1 is as follows: Iav1=(I1+I2+I3+I4+I5+I6) / 2.

[0053] The output end of the current selection module is connected to the feedback end of the first feedback control loop so as to use the current of all the max-phase BUCK circuits as the feedback value of the first feedback control loop; the output end of the current selection module is connected to the feedback end of the second feedback control loop so as to use the current of all the min-phase BUCK circuits as the feedback value of the second feedback control loop; the given value input module is respectively connected to the given value input ends of the first feedback control loop and the second feedback control loop so as to use the average phase current as the given value of the first feedback control loop and the second feedback control loop; the first feedback control loop is used to output a first PWM signal to control the current of all the max-phase BUCK circuits according to the feedback value and the given value; the second feedback control loop is used to output a second PWM signal to control the current of all the min-phase BUCK circuits according to the feedback value and the given value.

[0054] In this embodiment, the series staggered current sharing control unit also includes a voltage control loop, Uset is the voltage setting value, UO is the output voltage, the first feedback control loop includes a first current sharing loop and a first PWM modulation module 1, the second feedback control loop includes a second current sharing loop and a second PWM modulation module 2, the output end of the voltage control loop is connected to the first input end of the first PWM modulation module 1 and the second PWM modulation module 2 respectively through an error amplifier 1, the output end of the first current sharing loop is connected to the second input end of the first PWM modulation module 1 through the error amplifier 2, the output end of the second current sharing loop is connected to the second input end of the second PWM modulation module 2 through the error amplifier 3, the first PWM modulation module 1 is used to output a first PWM signal to control the BUCK circuit corresponding to all max phase currents; the second PWM modulation module 2 is used to output a second PWM signal to control the BUCK circuit corresponding to all min phase currents, and the first current sharing control signal includes a first PWM signal and a second PWM signal.

[0055] The first current balancing loop and the second current balancing loop are current balancing loops implemented by software control, and their control target is that a given value is equal to a feedback value.

[0056] In this embodiment, the current selection module uses 1max phase inductor current + 2max phase inductor current + 3max phase inductor current as the feedback input of the first current balancing loop, and uses 1min phase inductor current + 2min phase inductor current + 3min phase inductor current as the feedback input of the second current balancing loop. The first PWM modulation module 1 and the second PWM modulation module 2 are used to produce waveforms staggered by 180°. The PWM wave output by the first PWM modulation module 1 is output from the GPIO1 port, and the PWM wave output by the second PWM modulation module 2 is output from the GPIO2 port. The PWM wave output by the first PWM modulation module 1 and the PWM wave output by the second PWM modulation module 2, that is, the first PWM signal is input to the GPIO1 port, and the second PWM signal is input to the GPIO2 port.

[0057] In some embodiments of the present application, the switch switching module includes a first switch switching unit, the PWM signal output end of the first feedback control loop and the PWM signal output end of the second feedback control loop are both connected to the input end of the first switch switching unit, and multiple output ends of the first switch switching unit are respectively connected to the control end of each A-phase BUCK circuit and the B-phase BUCK circuit for switching the BUCK circuit corresponding to the first feedback control loop and the BUCK circuit corresponding to the second feedback control loop.

[0058] refer to Figure 6 As shown, since the series interleaved BUCK circuit in the present application includes a total of six BUCK circuits and requires six PWM waves for control, the first switch switching unit includes switch S1, switch S2 and switch S3, and switch S1, switch S2 and switch S3 are all double-pole double-throw relay switches. The GPIO1 port and the GPIO2 port are respectively connected to the input ends of switch S1, switch S2 and switch S3, and the output ends of switch S1, switch S2 and switch S3 are respectively connected to the six terminals of PWM1, PWM2, PWM3, PWM4, PWM5 and PWM6. It should be understood that PWM1-PWM6 are the control ends of BUCK1-BUCK6, respectively.

[0059] It should be noted that the control module switches the PWM waveforms of the first PWM modulation module 1 and the second PWM modulation module 2 through switches S1, S2 and S3. Through the switching of switches S1 to S3, the first PWM signal output by the first PWM modulation module 1 is always input to the gate of the MOS tube in the max phase BUCK circuit, and the second PWM signal output by the second PWM modulation module 2 is always input to the gate of the MOS tube in the min phase BUCK circuit. After the two current-sharing loops take effect, the PWM duty ratios of the 1max phase, 2max phase and 3max phase will all decrease, and the corresponding phase current will decrease. The PWM duty ratios of the 1min phase, 2min phase and 3min phase will all increase, and the corresponding phase current will decrease. Therefore, the series interleaved BUCK circuit can always maintain current balancing. It not only ensures the synchronization of the switch tubes of the same phase, but also ensures the current balancing between different phases.

[0060] refer to Figure 5 As shown, the parallel BUCK circuit includes second BUCK modules connected in parallel, and the parallel current sharing control unit includes third current sharing rings corresponding to multiple second BUCK modules one by one, and the output ends of the multiple third current sharing rings are respectively connected to an input end of the switch switching module.

[0061] Specifically, the second BUCK module is the six BUCK circuits of BUCK1, BUCK2, BUCK3, BUCK4, BUCK5, and BUCK6. In this embodiment, the parallel BUCK circuit includes six parallel BUCK circuits. Therefore, the parallel current sharing control unit in this embodiment includes six third current sharing loops and a voltage sharing loop. I1~I6 are the inductor currents of BUCK1-BUCK6, Uset is the voltage setting value, and UO is the output voltage. Uset is subtracted from Uo and sent to the error amplifier to obtain Uer, which is added to the respective third current sharing loops. Iav2 is the current sharing given value, Iav2=(I1+I2+I3+I4+I5+I6) / 6, the PWM modulation module is output from GPIO1 port to GPIO6 port. It should be understood that since the parallel BUCK circuit and the series interleaved BUCK circuit will not be started at the same time, the GPIO1 port and the GPIO2 port in this embodiment are the PWM wave output ports shared by the parallel current sharing control unit and the series interleaved current sharing control unit, which can save costs. Of course, the PWM wave output ports of the parallel current sharing control unit and the series interleaved current sharing control unit can also be separately input into different ports of the switch switching module, that is, two more GPIO ports are added, and the eight GPIO ports are respectively connected to 8 PWM modulation modules, which are switched through the switch.

[0062] Six PWM waves are outputted through six third current-sharing loops to respectively control the MOS tubes in BUCK1, BUCK2, BUCK3, BUCK4, BUCK5, and BUCK6, thereby achieving current balancing of the parallel BUCK circuits.

[0063] In some embodiments of the present application, the switch switching module includes a first switch switching unit and a second switch switching unit, the output ends of the series staggered current equalizing control unit and a part of the third current equalizing ring are both connected to the input end of the first switch switching unit, and the output end of the first switch switching unit and the output end of another part of the third current equalizing ring are both connected to the input end of the second switch switching unit.

[0064] Specifically, in this embodiment, the first switch switching unit is switch S1, switch S2 and switch S3, and the second switch switching unit is switch S7 and switch S8. When the parallel BUCK circuit is effective, the state of each switch is:

[0065] S1: placed on top;

[0066] S2: Any;

[0067] S3: Any;

[0068] S7: Place down;

[0069] S8: Place down;

[0070] Make GPIO1~GPIO6 directly output to PWM1~PWM6 to control the MOS tubes in each BUCK module.

[0071] When the series interleaved BUCK circuit is effective, the status of each switch is:

[0072] S7: placed on top;

[0073] S8: Place on top;

[0074] At this time, GPIO3~GPIO6 do not work, and the PWM wave of the BUCK module is sent out by GPIO1 and GPIO2 to control the MOS tubes in each BUCK module.

[0075] Among them, switches S1-S3 are switched according to the division of min phase and max phase, GPIO1 outputs max phase current, and GPIO2 outputs min phase current, as shown in Table 2:

[0076] Table 2 Switch action table

[0077]

[0078] Through the above logic control, the MOS tubes controlled by GPIO1 port can be the three BUCK circuits of 1max phase, 2max phase and 3max phase, and the MOS tubes controlled by GPIO2 port can be the three BUCK circuits of 1min phase, 2min phase and 3min phase. The PWM duty ratios of the three BUCK circuits of 1max phase, 2max phase and 3max phase will all decrease, and the corresponding phase current will decrease. The PWM duty ratios of 1min phase, 2min phase and 3min phase will all increase, and the corresponding phase current will decrease. Therefore, the series interleaved BUCK circuit can always maintain current sharing. It not only ensures the synchronization of the switch tubes in the same phase, but also ensures the current sharing between different phases.

[0079] In some embodiments of the present application, the second switch switching unit is further provided with a plurality of delay compensation switches for making the number of switches passed by each PWM signal consistent.

[0080] Specifically, the delay compensation switches in the present application include switch S4, switch S5 and switch S6. These three switches remain in a normally closed state and are not controlled. The purpose is to balance the delay of the switches so that all PWM waves pass through two switches, so that the delay of the PWM waves will be consistent.

[0081] Of course, it is also possible to select a switch with a delay so low that it can be ignored, thereby omitting the delay compensation switch.

[0082] The present application also relates to a source-load system, comprising a BUCK circuit and the series-parallel interleaved compatible current balancing control device of the above-mentioned embodiment, wherein the signal output end of the series-parallel interleaved compatible current balancing control device is connected to the control end of the BUCK circuit, and the BUCK circuit is a series interleaved BUCK circuit or a parallel BUCK circuit.

[0083] It should be noted that the source-carrying system is equipped with only one of the series interleaved BUCK circuit or the parallel BUCK circuit, so there is no need to configure different current sharing control devices according to different situations during production. It is only necessary to switch the output signal of the series-parallel interleaved compatible current sharing control device according to the BUCK circuit carried by the source-carrying system before leaving the factory. This can save costs by only changing the program and assembly method.

[0084] The present application also relates to an electronic device, comprising a series interleaved BUCK circuit, a parallel BUCK circuit, a BUCK circuit switching module and the series-parallel interleaved compatible current sharing control device of the above-mentioned embodiment, the BUCK circuit switching module is used to switch the operation of the series interleaved BUCK circuit and the parallel BUCK circuit, and the signal output end of the series-parallel interleaved compatible current sharing control device is respectively connected to the control end of the series interleaved BUCK circuit and the parallel BUCK circuit.

[0085] It should be noted that the electronic device is equipped with both a series interleaved BUCK circuit and a parallel BUCK circuit, which can adapt to high voltage output and high current output situations at the same time. Since the two BUCK circuits cannot be effective at the same time, the switching of the two BUCK circuits is achieved through a BUCK circuit switching module. It should be understood that when the BUCK circuit is switched, the output signal of the series-parallel interleaved compatible current sharing control device is also switched synchronously.

[0086] The embodiments of the present application are described in detail above in conjunction with the accompanying drawings, but the present application is not limited to the above embodiments, and various changes can be made within the knowledge scope of ordinary technicians in the relevant technical field without departing from the purpose of the present application.

Claims

1. A series-parallel interleaved compatible current sharing control device, connected to a series interleaved BUCK circuit or a parallel BUCK circuit, wherein the series interleaved BUCK circuit comprises a plurality of first BUCK modules connected in series, each of the first BUCK modules comprises an A-phase BUCK circuit and a B-phase BUCK circuit arranged in interleaved parallel, and the parallel BUCK circuit comprises a plurality of second BUCK modules connected in parallel, characterized in that: include: A series interleaved current sharing control unit, the series interleaved current sharing control unit is used to output a first current sharing control signal of the series interleaved BUCK circuit; A parallel current sharing control unit, the parallel current sharing control unit is used to output a second current sharing control signal of the parallel BUCK circuit; A switch switching module, wherein the PWM signal output end of the series staggered current sharing control unit and the PWM signal output end of the parallel current sharing control unit are respectively connected to the input end of the switch switching module; A control module, wherein the control module is connected to the control end of the switch switching module to switch the output of the first current sharing control signal and the second current sharing control signal according to the corresponding BUCK circuit.

2. The series-parallel interleaved compatible current sharing control device according to claim 1, characterized in that: The series staggered current sharing control unit includes a current sampling module, a current selection module, a given value input module, a first feedback control loop and a second feedback control loop; The current sampling module is used to obtain the A-phase current and the B-phase current of each first BUCK module, and the output end of the current sampling module is connected to the input end of the current selection module; The current selection module is used to compare the magnitudes of the A-phase current and the B-phase current in each first BUCK module, and obtain the max-phase BUCK circuit and the min-phase BUCK circuit corresponding to each first BUCK module according to the comparison result, wherein the max-phase BUCK circuit is a BUCK circuit with a larger current, and the min-phase BUCK circuit is a BUCK circuit with a smaller current; The given value input module is used to obtain an average phase current, where the average phase current is the sum of all A-phase currents and all B-phase currents divided by two; The output end of the current selection module is connected to the feedback end of the first feedback control loop so as to use the current of all max-phase BUCK circuits as the feedback value of the first feedback control loop; the output end of the current selection module is connected to the feedback end of the second feedback control loop so as to use the current of all min-phase BUCK circuits as the feedback value of the second feedback control loop; the given value input module is respectively connected to the given value input ends of the first feedback control loop and the second feedback control loop so as to use the average phase current as the given value of the first feedback control loop and the second feedback control loop; the first feedback control loop is used to output a first PWM signal to control the current of all max-phase BUCK circuits according to the feedback value and the given value; the second feedback control loop is used to output a second PWM signal to control the current of all min-phase BUCK circuits according to the feedback value and the given value.

3. The series-parallel interleaved compatible current sharing control device according to claim 2, characterized in that: The switch switching module includes a first switch switching unit, the PWM signal output end of the first feedback control loop and the PWM signal output end of the second feedback control loop are both connected to the input end of the first switch switching unit, and multiple output ends of the first switch switching unit are respectively connected to the control end of each A-phase BUCK circuit and the B-phase BUCK circuit for switching the BUCK circuit corresponding to the first feedback control loop and the BUCK circuit corresponding to the second feedback control loop.

4. The series-parallel interleaved compatible current sharing control device according to claim 2, characterized in that: The series interleaved BUCK circuit also includes a voltage control loop, the first feedback control loop includes a first current balancing loop and a first PWM modulation module, the second feedback control loop includes a second current balancing loop and a second PWM modulation module, the output end of the voltage control loop is respectively connected to the first input end of the first PWM modulation module and the second PWM modulation module, the output end of the first current balancing loop is connected to the second input end of the first PWM modulation module, the output end of the second current balancing loop is connected to the second input end of the second PWM modulation module, the first PWM modulation module is used to output a first PWM signal to control the current of all max-phase BUCK circuits; the second PWM modulation module is used to output a second PWM signal to control the current of all min-phase BUCK circuits.

5. The series-parallel interleaved compatible current sharing control device according to claim 1, characterized in that: The parallel current sharing control unit includes a third current sharing ring corresponding to the plurality of second BUCK modules one by one, and the output ends of the plurality of third current sharing rings are respectively connected to an input end of the switch switching module.

6. The series-parallel interleaved compatible current sharing control device according to claim 5, characterized in that: The switch switching module includes a first switch switching unit and a second switch switching unit. The output ends of the series staggered current equalizing control unit and part of the third current equalizing ring are both connected to the input end of the first switch switching unit, and the output end of the first switch switching unit and the output end of another part of the third current equalizing ring are both connected to the input end of the second switch switching unit.

7. The series-parallel interleaved compatible current sharing control device according to claim 6, characterized in that: The second switch switching unit is further provided with a plurality of delay compensation switches for making the number of switches passed by each PWM signal consistent.

8. A source-carrying system, characterized in that: It comprises a BUCK circuit and a series-parallel interleaved compatible current sharing control device as described in any one of claims 1 to 7, wherein a signal output end of the series-parallel interleaved compatible current sharing control device is connected to a control end of the BUCK circuit, and the BUCK circuit is a series interleaved BUCK circuit or a parallel BUCK circuit.

9. An electronic device, characterized in that: It comprises a series interleaved BUCK circuit, a parallel BUCK circuit, a BUCK circuit switching module and a series-parallel interleaved compatible current sharing control device as described in any one of claims 1 to 7, wherein the BUCK circuit switching module is used to switch the operation of the series interleaved BUCK circuit and the parallel BUCK circuit, and the signal output end of the series-parallel interleaved compatible current sharing control device is respectively connected to the control end of the series interleaved BUCK circuit and the control end of the parallel BUCK circuit.

Images