Power supply module and power supply equipment

Abstract

The embodiment of the invention provides a power supply module and power supply equipment. The power supply module comprises an interleaved PFC circuit and a controller, the interleaved PFC circuit comprises an inductor and a high-frequency bridge arm, and a bridge arm midpoint of the high-frequency bridge arm is used for being connected with an alternating current power supply through the inductor. And the controller is used for controlling the duty ratio of the high-frequency switch tube for discharging the inductor in the high-frequency bridge arm to be smaller than a preset duty ratio when the phase voltage output by the alternating current power supply to the interleaving PFC circuit is greater than a preset voltage. Wherein when the duty ratio of the high-frequency switch tube for discharging the inductor is smaller than the preset duty ratio, the current flowing through the inductor does not pass through the zero point. And the controller is also used for controlling the duty ratio of the high-frequency switch tube for discharging the inductor to be greater than or equal to a preset duty ratio when the phase voltage is smaller than or equal to a preset voltage. Wherein when the duty ratio of the high-frequency switch tube for discharging the inductor is greater than or equal to the preset duty ratio, the current flowing through the inductor passes through the zero point.

Description

Technical Field

[0001] The present application relates to the field of circuits, and more particularly, to a power supply module and a power supply device. Background Art

[0002] The interleaved parallel power factor correction (PFC) circuit has become the mainstream technology of the PFC circuit in the power supply module due to its high efficiency and power density. Among them, in order to reduce the loss of the inductor in the interleaved parallel PFC circuit, the interleaved parallel PFC circuit usually operates in the continuous current mode (CCM). Alternatively, in order to reduce the conduction loss of the switching transistor in the interleaved parallel PFC circuit, the interleaved parallel PFC circuit usually operates in the critical conduction mode (CRM) or the triangular current mode (TCM).

[0003] However, the current interleaved parallel PFC circuit usually needs to support a wide input voltage range, and the losses generated by the inductor and the switching transistor in different input voltage segments within the wide input voltage range are different, resulting in that a single CCM mode, or a single CRM mode or TCM mode cannot well reduce the loss of the interleaved parallel PFC circuit within the entire input voltage range. Summary of the Invention

[0004] The present application provides a power supply module and a power supply device. By making the interleaved parallel PFC circuit operate in the CCM mode in the high input voltage segment within the entire input voltage range and operate in the CRM mode or the TCM mode in the low input voltage segment within the entire input voltage range, the loss of the interleaved parallel PFC circuit within the entire input voltage range can be reduced, thereby improving the efficiency and operation stability of the power supply module and the power supply device.

[0005] In a first aspect, a power supply module is provided. The power supply module includes an interleaved parallel power factor correction (PFC) circuit and a controller. The interleaved parallel PFC circuit includes an inductor and a high-frequency bridge arm. The high-frequency bridge arm includes two series-connected high-frequency switching tubes. The midpoint of the bridge arm of the high-frequency bridge arm is used to connect to an AC power supply through the inductor. The controller is configured to control the duty cycle of the high-frequency switching tube that discharges the inductor in the high-frequency bridge arm to be less than a preset duty cycle when the phase voltage output from the AC power supply to the interleaved parallel PFC circuit is greater than a preset voltage. Wherein, when the duty cycle of the high-frequency switching tube that discharges the inductor is less than the preset duty cycle, the current flowing through the inductor does not pass through zero. The controller is further configured to control the duty cycle of the high-frequency switching tube that discharges the inductor to be greater than or equal to the preset duty cycle when the phase voltage is less than or equal to the preset voltage. Wherein, when the duty cycle of the high-frequency switching tube that discharges the inductor is greater than or equal to the preset duty cycle, the current flowing through the inductor passes through zero.

[0006] Based on the above design, in the high input voltage section within the full range of the input voltage of the interleaved parallel PFC circuit, by making the duty cycle of the high-frequency switching tube that discharges the inductor less than the preset duty cycle, the discharge time of the inductor within one switching tube cycle can be relatively short, so that the current flowing through the inductor does not drop to zero within one switching tube cycle, realizing that the interleaved parallel PFC circuit operates in the CCM mode. In the low input voltage section within the full range of the input voltage of the interleaved parallel PFC circuit, by making the duty cycle of the high-frequency switching tube that discharges the inductor greater than or equal to the preset duty cycle, the discharge time of the inductor within one switching tube cycle can be relatively long, so that the current flowing through the inductor can drop below zero within one switching tube cycle, realizing that the interleaved parallel PFC circuit operates in the CRM mode or the TCM mode. In this way, in the high input voltage section where the inductor loss is more serious, the current ripple flowing through the inductor can be reduced through the CCM mode, thereby reducing the inductor loss and improving the performance of indicators such as THD and PD of the power supply module. Also, in the low input voltage section where the high-frequency switching tube loss is more serious, soft turn-on of the high-frequency switching tube can be achieved through the CRM mode or the TCM mode, thereby reducing the loss of the high-frequency switching tube. Furthermore, the loss of the interleaved parallel PFC circuit within the full range of the input voltage can be reduced, and the efficiency and operation stability of the power supply module can be improved.

[0007] In one implementation, the controller is configured to, when the interleaved parallel PFC circuit starts: control the duty cycle of the high-frequency switching tube that discharges the inductor to be less than the preset duty cycle when the phase voltage is greater than the preset voltage.

[0008] Based on the above design, when the phase voltage output by the AC power supply at the start of the interleaved parallel PFC circuit is in the high input voltage segment within the full range of the input voltage of the interleaved parallel PFC circuit, the controller can make the duty cycle of the high-frequency switching transistor that discharges the inductor less than the preset duty cycle, so that the interleaved parallel PFC circuit operates in the CCM mode after startup. Since in the high input voltage segment, the loss of the inductor connected to the high-frequency bridge arm is more serious than the loss of the high-frequency switching transistor in the high-frequency bridge arm, the above design can better reduce the inductor loss through the CCM mode after the interleaved parallel PFC circuit starts up, thereby improving the efficiency and operation stability of the interleaved parallel PFC circuit after startup.

[0009] In one implementation, the controller is used when the duty cycle of the high-frequency switching transistor that discharges the inductor is greater than or equal to the preset duty cycle: when the phase voltage is greater than the preset voltage, reduce the duty cycle of the high-frequency switching transistor that discharges the inductor.

[0010] Based on the above design, when the interleaved parallel PFC circuit operates in the CRM mode or the TCM mode after startup, the controller can, when the phase voltage output by the AC power supply reaches the high input voltage segment greater than the preset voltage, reduce the duty cycle of the high-frequency switching transistor that discharges the inductor, so that the operating mode of the interleaved parallel PFC circuit switches from the CRM mode or the TCM mode to the CCM mode. Since in the high input voltage segment, the loss of the inductor connected to the high-frequency bridge arm is more serious than the loss of the high-frequency switching transistor in the high-frequency bridge arm, switching the operating mode of the interleaved parallel PFC circuit to the CCM mode can better reduce the inductor loss, thereby improving the efficiency and operation stability of the interleaved parallel PFC circuit during operation.

[0011] In one implementation, the controller is used when the duty cycle of the high-frequency switching transistor that discharges the inductor is greater than or equal to the preset duty cycle: when the phase voltage is greater than the preset voltage, reduce the on-time of the high-frequency switching transistor that discharges the inductor and keep the off-time of the high-frequency switching transistor that discharges the inductor unchanged, so as to reduce the duty cycle of the high-frequency switching transistor that discharges the inductor. That is, the switching frequency of the high-frequency switching transistor that discharges the inductor is increased.

[0012] In one implementation, the controller is used when the interleaved parallel PFC circuit starts up: when the phase voltage is less than or equal to the preset voltage, control the duty cycle of the high-frequency switching transistor that discharges the inductor to be greater than or equal to the preset duty cycle.

[0013] Based on the above design, when the phase voltage output by the AC power supply at the start of the interleaved parallel PFC circuit is in the low input voltage range within the full range of the input voltage of the interleaved parallel PFC circuit, the controller can control the interleaved parallel PFC circuit to operate in the CRM mode or the TCM mode after startup. Since in the low input voltage range, the loss of the high-frequency switching transistors in the high-frequency bridge arm is more serious than that of the inductor connected to the high-frequency bridge arm, the above design can achieve soft turn-on of the high-frequency switching transistors through the CRM mode or the TCM mode after the interleaved parallel PFC circuit starts up, thereby better reducing the loss of the high-frequency switching transistors and improving the efficiency and operation stability of the interleaved parallel PFC circuit after startup.

[0014] In one implementation, when the duty cycle of the high-frequency switching transistor that discharges the inductor is less than a preset duty cycle, the controller is configured to: when the phase voltage is less than or equal to a preset voltage, increase the duty cycle of the high-frequency switching transistor that discharges the inductor.

[0015] Based on the above design, when the interleaved parallel PFC circuit operates in the CCM mode after startup, the controller can increase the duty cycle of the high-frequency switching transistor that discharges the inductor when the phase voltage output by the AC power supply AC reaches the low input voltage range less than or equal to the preset voltage, so that the operating mode of the interleaved parallel PFC circuit is switched from the CCM mode to the CRM mode or the TCM mode. Since in the low input voltage range, the loss of the high-frequency switching transistors in the high-frequency bridge arm is more serious than the loss of the inductor connected to the high-frequency bridge arm, switching the operating mode of the interleaved parallel PFC circuit to the CRM mode or the TCM mode can better reduce the loss of the high-frequency switching transistors, thereby improving the efficiency and operation stability of the interleaved parallel PFC circuit during operation.

[0016] In one implementation, the number of high-frequency bridge arms and inductors are each multiple. The interleaved parallel PFC circuit further includes a low-frequency bridge arm, which is connected in parallel between the low-frequency bridge arm and the multiple high-frequency bridge arms. One end of an inductor is connected to the midpoint of one high-frequency bridge arm. The other ends of the multiple inductors are connected together at a common point, and the midpoint of the low-frequency bridge arm serve as a set of input terminals of the interleaved parallel PFC circuit and are used to connect to the AC power supply. The controller is configured to control the duty cycle of the high-frequency switching transistor that discharges the inductor in each high-frequency bridge arm to be less than the preset duty cycle when the phase voltage is greater than the preset voltage. The controller is further configured to control the duty cycle of the high-frequency switching transistor that discharges the inductor in each high-frequency bridge arm to be greater than or equal to the preset duty cycle when the phase voltage is less than or equal to the preset voltage.

[0017] Based on the above design, in the high input voltage section within the full range of the input voltage of the interleaved parallel PFC circuit, the on-time of the high-frequency switching transistor that discharges the inductor in each high-frequency bridge arm in the interleaved parallel PFC circuit can be made relatively short within the switching transistor period, so that the current flowing through each inductor in the interleaved parallel PFC circuit will not drop to zero, realizing that the interleaved parallel PFC circuit operates in the CCM mode. And in the low input voltage section within the full range of the input voltage of the interleaved parallel PFC circuit, the on-time of the high-frequency switching transistor that discharges the inductor in each high-frequency bridge arm can be made relatively long within the switching transistor period, so that the current flowing through each inductor drops through the zero-crossing point, realizing that the interleaved parallel PFC circuit operates in the CRM mode or the TCM mode. Furthermore, the loss of the interleaved parallel PFC circuit within the full range of the input voltage can be reduced, and the efficiency and operation stability of the power supply module can be improved.

[0018] In one implementation, the source electrode of a high-frequency switching transistor in each high-frequency bridge arm is connected to the drain electrode of another high-frequency switching transistor. The controller is configured to, when the phase voltage is in the positive half-cycle and the current output by the AC power supply flows into the interleaved parallel PFC circuit from the common point: when the phase voltage is greater than the preset voltage, control the duty cycle of a high-frequency switching transistor in each high-frequency bridge arm to be less than the preset duty cycle, and when the phase voltage is less than or equal to the preset voltage, control the duty cycle of a high-frequency switching transistor in each high-frequency bridge arm to be greater than or equal to the preset duty cycle.

[0019] Based on the above design, when the source electrode of a high-frequency switching transistor in each high-frequency bridge arm is connected to the drain electrode of another high-frequency switching transistor and the phase voltage output by the AC power supply is in the positive half-cycle, this one high-frequency switching transistor in each high-frequency bridge arm is the high-frequency switching transistor that discharges the inductor in the high-frequency bridge arm. Therefore, the controller can control the operating mode of the interleaved parallel PFC circuit through the duty cycle of this one high-frequency switching transistor in each high-frequency bridge arm.

[0020] In one implementation, the source electrode of a high-frequency switching transistor in each high-frequency bridge arm is connected to the drain electrode of another high-frequency switching transistor. The controller is configured to, when the phase voltage is in the negative half-cycle and the current output by the AC power supply flows into the interleaved parallel PFC circuit from the midpoint of the low-frequency bridge arm: when the phase voltage is greater than the preset voltage, control the duty cycle of another high-frequency switching transistor in each high-frequency bridge arm to be less than the preset duty cycle, and when the phase voltage is less than or equal to the preset voltage, control the duty cycle of another high-frequency switching transistor in each high-frequency bridge arm to be greater than or equal to the preset duty cycle.

[0021] Based on the above design, when the source electrode of one high-frequency switching tube in each high-frequency bridge arm is connected to the drain electrode of another high-frequency switching tube and the phase voltage output by the AC power supply is in the negative half-cycle, the other high-frequency switching tube in each high-frequency bridge arm is the high-frequency switching tube that allows the inductor to discharge in the high-frequency bridge arm. Therefore, the controller can control the working mode of the interleaved parallel PFC circuit by means of the duty cycle of the other high-frequency switching tube in each high-frequency bridge arm.

[0022] In one implementation, the low-frequency bridge arm includes two diodes connected in series, or the low-frequency bridge arm includes two low-frequency switching tubes connected in series.

[0023] In a second aspect, a power supply device is provided. The power supply device includes a plurality of power supply modules as described in any one of the above first aspects, the plurality of power supply modules are connected in parallel, and the plurality of power supply modules are used to supply power to a load.

[0024] For the beneficial effects not elaborated in the second aspect, reference can be made to the beneficial effects of the first aspect above, which will not be repeated here. Description of the Drawings

[0025] Figure 1 It is a schematic structural diagram of a power supply device provided by an embodiment of the present application.

[0026] Figure 2 It is an example provided by an embodiment of the present application Figure 1 The schematic structural diagram of the power supply module shown.

[0027] Figure 3 It is an example provided by an embodiment of the present application Figure 2 The waveform schematic diagram when the interleaved parallel PFC circuit shown works in the CCM mode.

[0028] Figure 4 It is an example provided by an embodiment of the present application Figure 2 The waveform schematic diagram when the interleaved parallel PFC circuit shown works in the TCM mode.

[0029] Figure 5 It is a schematic structural diagram of a power supply module provided by an embodiment of the present application.

[0030] Figure 6 and Figure 7 respectively are the specific schematic structural diagrams of an example of the power supply module provided by an embodiment of the present application Figure 5 shown.

[0031] Figure 8 is Figure 6 The waveform schematic diagram corresponding to the operation of the interleaved parallel PFC circuit shown during the positive half-cycle of the phase voltage.

[0032] Figure 9It is a schematic flowchart of a controller controlling the working mode of an interleaved parallel PFC circuit provided by an embodiment of the present application. Detailed implementation manners

[0033] To facilitate the understanding of the embodiments of the present application, the following explanations are made before introducing the embodiments of the present application.

[0034] In the description of the embodiments of the present application, "connection" may refer to electrical connection. Among them, electrical connection can be understood as the signal transmission between two electrical components through direct electrical connection or indirect electrical connection. For example, when A is electrically connected to B, it can be understood that A is directly electrically connected to B, or it can be understood that A and B are indirectly electrically connected through one or more other electronic devices.

[0035] In the embodiments of the present application, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more features. In addition, in the description of the embodiments of the present application, "a plurality" means two or more than two, and "at least one" and "one or more" mean one, two or more than two.

[0036] Next, the technical solutions in the present application will be described with reference to the accompanying drawings.

[0037] First, to facilitate the understanding of the technical solutions provided by the embodiments of the present application, the application scenarios applicable to the embodiments of the present application are introduced first.

[0038] Figure 1 It is a schematic structural diagram of a power supply device 10 provided by an embodiment of the present application.

[0039] Refer to Figure 1 , the power supply device 10 includes a plurality of power modules 11 connected in parallel. Among them, each power module 11 is used to convert the alternating current output by the alternating current power supply 20 into direct current and then output it to the load 30, so as to supply power to the load 30.

[0040] It should be understood that in the embodiments of the present application, the power supply device 10 may be a device for providing electric energy in scenarios such as communication base stations, energy storage systems, photovoltaic systems, data centers, or charging stations. For example, the power supply device 10 may be a power cabinet in a communication base station. Correspondingly, the load 30 may be an electrical device such as a remote radio unit (RRU), an active antenna unit (AAU), or a base band unit (BBU) in the communication base station. Or, the power supply device 10 may also be a charging pile in a charging station. Correspondingly, the load 30 may be an electric vehicle.

[0041] It should also be understood that in the embodiments of the present application, the power supply module 11 may be a rectifier in the power supply device 10. The specific structure in the power supply module 11 will be described below by way of example.

[0042] Figure 2 is one provided by the embodiments of the present application Figure 1 The specific structural schematic diagram of the power supply module 11 shown.

[0043] Referring to Figure 2 , the power supply module 11 includes an interleaved parallel PFC circuit 111. Among them, the interleaved parallel PFC circuit 111 includes a low-frequency bridge arm 111a, a high-frequency bridge arm 111b, a high-frequency bridge arm 111c, an inductor L1, an inductor L2, and an output capacitor C1. Among them, the low-frequency bridge arm 111a includes two series-connected low-frequency switching tubes, and the high-frequency bridge arms 111b and 111c respectively include two series-connected high-frequency switching tubes. The switching frequency of the low-frequency switching tubes is less than that of the high-frequency switching tubes, and a body diode is connected in parallel with each high-frequency switching tube.

[0044] Among them, one end of the inductor L1 is connected to the midpoint P1 of the bridge arm of the high-frequency bridge arm 111b, and one end of the inductor L2 is connected to the midpoint P2 of the bridge arm of the high-frequency bridge arm 111c. And, the common point P3 after the other ends of the inductor L1 and the inductor L2 are connected, and the midpoint P4 of the low-frequency bridge arm 111a are used as a set of input terminals of the interleaved parallel PFC circuit 111 and are used to connect to the AC power supply 20. The two ends after the parallel connection between the low-frequency bridge arm 111a, the high-frequency bridge arm 111b, the high-frequency bridge arm 111c, and the output capacitor C1 are used as a set of output terminals of the interleaved parallel PFC circuit 111 and are used to connect to the load 30.

[0045] It should be understood that in specific implementation, the high-frequency bridge arms 111b and 111c may operate with a 180° phase shift. In addition, the fact that the above interleaved parallel PFC circuit 111 includes two high-frequency bridge arms is only illustrative. For example, in some other embodiments, the interleaved parallel PFC circuit 111 may further include more than two high-frequency bridge arms. For example, the interleaved parallel PFC circuit 111 may further include three high-frequency bridge arms, and the three high-frequency bridge arms may operate with a 120° phase shift.

[0046] It should also be understood that in the embodiments of the present application, Figure 3 the fact that the shown low-frequency bridge arm 111a includes two series-connected low-frequency switching tubes is also only illustrative. For example, in some other embodiments, the two series-connected low-frequency switching tubes may be replaced by two series-connected diodes.

[0047] In the embodiments of the present application, the switching transistor may refer to various types of power switching transistors such as metal oxide semiconductor field effect transistor (MOSFET), bipolar junction transistor (BJT), insulated gate bipolar transistor (IGBT), silicon carbide (SiC) transistor, etc. For the convenience of description and understanding, the embodiments of the present application take the switching transistor as a MOSFET as an example for illustration.

[0048] The following takes Figure 2 the high-frequency bridge arm 111b shown as an example to illustrate the working principle of the interleaved parallel PFC circuit 111.

[0049] When the phase voltage output by the AC power supply 20 to the interleaved parallel PFC circuit 111 is in the positive half cycle, the common point P3 is positive and the midpoint P4 of the bridge arm is negative. In this case, the low-frequency switching transistor Sa2 in the low-frequency bridge arm 111a conducts, and the low-frequency switching transistor Sa1 turns off. And, the high-frequency switching transistor Sb2 in the high-frequency bridge arm 111b acts as the main transistor, and the high-frequency switching transistor Sb1 acts as the synchronous transistor.

[0050] Among them, when the high-frequency switching transistor Sb2 conducts and the high-frequency switching transistor Sb1 turns off, the current output by the AC power supply 20 passes through the common point P3 → inductor L1 → high-frequency power transistor Sb2 → low-frequency switching transistor Sa2 → midpoint P4 of the bridge arm in the interleaved parallel PFC circuit 111 in sequence, thereby forming an excitation circuit of the inductor L1. At this time, the current flowing through the inductor L1 rises, and the inductor L1 is charged. And when the high-frequency switching transistor Sb2 turns off and the high-frequency switching transistor Sb2 conducts, the current output by the AC power supply 20 passes through the common point P3 → inductor L1 → high-frequency switching transistor Sb1 → output capacitor C1 → low-frequency switching transistor Sa2 → midpoint P4 of the bridge arm in the interleaved parallel PFC circuit 111 in sequence, thereby forming a demagnetization circuit of the inductor L1. At this time, the current flowing through the inductor L1 linearly decreases, and the AC power supply 20 and the inductor L1 discharge to the output capacitor C1.

[0051] It should be understood that in the embodiments of the present application, the switching periods of the respective high-frequency switching transistors in the interleaved parallel PFC circuit 111 are the same. Among them, when the phase voltage output by the AC power supply 20 to the interleaved parallel PFC circuit 111 is in the positive half cycle, within one switching period, the conduction time of the high-frequency switching transistor Sb2 = the off time of the high-frequency switching transistor Sb1 = the charging time of the inductor L1, and the off time of the high-frequency switching transistor Sb2 = the conduction time of the high-frequency switching transistor Sb1 = the discharging time of the inductor L1.

[0052] It should also be understood that when the phase voltage output by the AC power supply 20 to the interleaved parallel PFC circuit 111 is in the positive half-cycle, since the inductor L1 is charged during the conduction time of the high-frequency switching transistor Sb2 acting as the main transistor in the high-frequency bridge arm 111b, the high-frequency switching transistor Sb2 can also be referred to as the high-frequency switching transistor that charges the inductor L1 in the high-frequency bridge arm 111b. Similarly, the high-frequency switching transistor Sb1 acting as the synchronous transistor can also be referred to as the high-frequency switching transistor that discharges the inductor L1 in the high-frequency bridge arm 111b.

[0053] When the phase voltage output by the AC power supply 20 to the interleaved parallel bridgeless PFC circuit 111 is in the negative half-cycle, the common point P3 is negative and the midpoint P4 of the bridge arm is positive. In this case, the low-frequency switching transistor Sa1 in the low-frequency bridge arm 111a conducts, and the low-frequency switching transistor Sa2 is turned off. Also, the high-frequency switching transistor Sb1 in the high-frequency bridge arm 111b acts as the main transistor, and the high-frequency switching transistor Sb2 acts as the synchronous transistor.

[0054] Among them, when the high-frequency switching transistor Sb1 conducts and the high-frequency switching transistor Sb2 is turned off, the current output by the AC power supply 20 passes through the midpoint P4 of the bridge arm → the low-frequency switching transistor Sa1 → the high-frequency switching transistor Sb1 → the inductor L1 → the common point P3 in the interleaved parallel PFC circuit 111 in sequence, and at this time the inductor L1 is charged. When the high-frequency switching transistor Sb1 is turned off and the high-frequency switching transistor Sb2 conducts, the current output by the AC power supply 20 passes through the midpoint P4 of the bridge arm → the low-frequency switching transistor Sa1 → the output capacitor C1 → the high-frequency switching transistor Sb2 → the inductor L1 → the common point P3 in the interleaved parallel PFC circuit 111 in sequence, and at this time the AC power supply 20 and the inductor L1 discharge to the output capacitor C1.

[0055] It should be understood that the working principle of the high-frequency switching transistors Sc1 and Sc2 connected in series in the high-frequency bridge arm 111c is similar to that of the high-frequency switching transistors Sb1 and Sb2 connected in series in the high-frequency bridge arm 111b. For the specific description, reference can be made to the relevant description of the high-frequency bridge arm 111b above, and it will not be elaborated here.

[0056] Based on the above analysis, when the phase voltage output by the AC power supply 20 to the interleaved parallel PFC circuit 111 is in different half-cycles, the power supply module 11 controls the two high-frequency switching transistors of the high-frequency bridge arm 111b and the two high-frequency switching transistors of the high-frequency bridge arm 111b to conduct alternately, so that the inductors L1 and L2 are charged and discharged alternately respectively, thereby realizing the rectification function and the power factor correction function of the interleaved parallel PFC circuit 111.

[0057] In specific implementation, the interleaved parallel PFC circuit 111 can operate in the CCM mode, or in the CRM mode or the TCM mode. Taking the high-frequency bridge arm 111b as an example below, the working processes of the interleaved parallel PFC circuit 111 operating in the above different modes will be introduced. It should be understood that the working process of the interleaved parallel PFC circuit 111 when the phase voltage output by the AC power supply 20 is in the negative half-cycle is similar to the working process when the phase voltage output by the AC power supply 20 is in the positive half-cycle. To avoid redundancy, the following will only introduce the case where the phase voltage output by the AC power supply 20 is in the positive half-cycle as an example.

[0058] Figure 3 and Figure 4 exemplarily shows Figure 2 the waveforms of the phase voltage output by the AC power supply 20 to the interleaved parallel PFC circuit 111 and the current I flowing through the inductor L1 when the shown interleaved parallel PFC circuit 111 operates in the above different working modes. L1 of the waveform.

[0059] In some embodiments, in combination with Figure 2 and Figure 3 , when the phase voltage output by the AC power supply 20 to the interleaved parallel bridgeless PFC circuit 111 is in the positive half-cycle, the power supply module 11 can first control the high-frequency switch tube Sb2 to conduct and the high-frequency switch tube Sb1 to disconnect, so that the current I flowing through the inductor L1 L1 rises and the inductor L1 is charged. After the current I flowing through the inductor L1 L1 rises to the peak current corresponding to the inductor L1, the power supply module 11 controls the high-frequency switch tube Sb2 to disconnect and the high-frequency switch tube Sb1 to conduct, so that the current I flowing through the inductor L1 L1 decreases.

[0060] Furthermore, the power supply module 11 can control the high-frequency switch tube Sb2 to conduct and the high-frequency switch tube Sb1 to disconnect after the current I flowing through the inductor L1 L1 decreases for a fixed duration, so that the inductor L1 is charged again. The above working mode can be called the CCM working mode.

[0061] It should be understood that when the interleaved parallel PFC circuit 111 operates in the CCM mode, the current I flowing through the inductor L1 L1 is continuous and the current I L1It does not pass through zero within each switching cycle of the switching transistor. Thus, in the CCM mode, the ripple of the current IL1 flowing through the inductor L1 is small. Correspondingly, the loss of the inductor L1 is small, and the high-frequency ripples of the voltage and current at the input and output of the interleaved parallel PFC circuit 111 are small. The operation of the power supply module 11 is more stable, and the total harmonic distortion (THD), power factor (PF), and other indicators of the power supply module 11 perform well. However, since the high-frequency switching transistor Sb2 is in a hard-switching-on state, the loss of the high-frequency switching transistor Sb2 is large, and the CCM mode has a high requirement for the inductance value of the inductor L1.

[0062] In some other embodiments, in combination with Figure 2 and Figure 4 , when the phase voltage output by the AC power supply 20 to the interleaved parallel bridgeless PFC circuit 111 is in the positive half-cycle, the power supply module 11 can first control the high-frequency switching transistor Sb2 to conduct and the high-frequency switching transistor Sb1 to disconnect, and then control the high-frequency switching transistor Sb2 to disconnect and the high-frequency switching transistor Sb1 to conduct, so that the current I L1 flowing through the inductor L1 first rises to the peak current corresponding to the inductor L1 and then drops.

[0063] Further, the power supply module 11 can control the high-frequency switching transistor Sb1 to disconnect when the current I L1 flowing through the inductor L1 drops to near 0 A, so that the current I L1 flowing through the inductor L1 continues to flow through the body diode in parallel with the high-frequency switching transistor Sb1. Since the body diode of the high-frequency switching transistor Sb1 has a reverse recovery characteristic, there will be a certain reverse recovery current. Using this reverse recovery current, the conduction of the high-frequency switching transistor Sb2 of the main transistor can be achieved. The above working mode can be called the CRM mode or the TCM mode. Among them, Figure 4 Exemplarily shows the waveform diagrams of the phase voltage output by the AC power supply and the current flowing through the inductor L1 when the interleaved parallel PFC circuit 111 operates in the TCM mode.

[0064] It should be understood that when the interleaved parallel PFC circuit 111 operates in the CRM mode or the TCM mode, the current I L1 flowing through the inductor L1 is continuous and the current I L1 passes through zero within each switching cycle of the high-frequency switching transistor Sb1. That is to say, in the CRM mode or the TCM mode, the high-frequency switching transistor Sb2 acting as the main transistor needs to conduct when the current I L1 flowing through the inductor L1 drops to pass through zero. Thus, in the CRM mode or the TCM mode, the high-frequency switching transistor Sb2 is in a soft-switching-on state, and the loss of the high-frequency switching transistor Sb2 is small, but the current I L1has a relatively large ripple, resulting in a large loss of inductor L1, and poor performance in indicators such as THD and PD of the power supply module 11.

[0065] In current practical applications, the interleaved parallel PFC circuit 111 usually needs to operate in a relatively wide input voltage range, and the losses generated by the inductor and high-frequency switching transistors in the interleaved parallel PFC circuit 111 are different in different input voltage segments within the wide input voltage range. For example, in the low input voltage segment within the wide input voltage range, the current ripple flowing through the inductor is small, and at this time, compared with the loss of the inductor, the loss of the high-frequency switching transistor is more serious. In the high input voltage segment within the wide input voltage range, the current ripple flowing through the inductor is large, and at this time, compared with the loss of the high-frequency switching transistor, the loss of the inductor is more serious. This results in that it is impossible to well reduce the losses of the interleaved parallel PFC circuit 111 within the entire input voltage range only through a single CCM mode or only through a single CRM mode or TCM mode.

[0066] Based on the above content, the embodiments of the present application provide a power supply module. By making the interleaved parallel PFC circuit in the power supply module operate in the CCM mode in the high input voltage segment within the entire input voltage range and operate in the CRM mode or TCM mode in the low input voltage segment within the entire input voltage range, the losses of the interleaved parallel PFC circuit within the entire input voltage range can be reduced, thereby improving the efficiency and operation stability of the power supply module and the power supply device.

[0067] It should be understood that the power supply module provided by the embodiments of the present application may be a rectifier. The power supply module provided by the embodiments of the present application can be applied to power supply devices in scenarios such as communication base stations, energy storage systems, photovoltaic systems, data centers, or charging stations, for example, applied to the power supply device 10 shown above Figure 1 In addition, the power supply module can also be applied to on-board chargers of electric vehicles or power adapters of mobile phones, etc.

[0068] The power supply module provided by the embodiments of the present application will be introduced below with reference to the accompanying drawings. It should be noted that for ease of understanding, in the accompanying drawings provided by the embodiments of the present application, solid lines are used to represent power transmission lines, and dashed lines are used to represent control signal transmission lines.

[0069] Figure 5 is a schematic structural diagram of a power supply module 40 provided by the embodiments of the present application.

[0070] Refer to Figure 5, the power module 40 includes an interleaved parallel PFC circuit 41. The interleaved parallel PFC circuit 41 includes a high-frequency bridge arm and an inductor. The high-frequency bridge arm includes two high-frequency switching tubes connected in series. The midpoint of the high-frequency bridge arm is used to connect an alternating current (AC) through the inductor. In a specific implementation, the interleaved parallel PFC circuit 41 is used to receive a phase voltage U output by the AC power source AC. AC , and then output to the load after rectification and power factor correction. In the above working process, one high-frequency switch tube in the high-frequency bridge arm is used to act as the main tube to realize the charging of the inductor, and the other high-frequency switch tube in the high-frequency bridge arm is used to act as the synchronous tube to realize the discharge of the inductor.

[0071] For a detailed description of the high-frequency bridge arm and its connected inductor, refer to Figure 2 The relevant description of the interleaved parallel PFC circuit 111 is not repeated here.

[0072] Continue reading Figure 5 The power module 40 also includes a controller 42, which is used to output a phase voltage U of the AC power source AC. AC When the voltage is greater than the preset voltage, the duty cycle of the high-frequency switch tube in the high-frequency bridge arm that allows the inductor to discharge is controlled to be less than the preset duty cycle, that is, the duty cycle of the synchronous tube in the high-frequency bridge arm is controlled to be less than the preset duty cycle. Correspondingly, the duty cycle of the main tube in the high-frequency bridge arm is greater than or equal to the preset duty cycle. Among them, when the duty cycle of the high-frequency switch tube that allows the inductor to discharge is less than the preset duty cycle, the current flowing through the inductor does not pass through the zero point.

[0073] Specifically, the controller 42 can output the phase voltage U of the AC power source AC. AC When it is greater than the preset voltage, confirm that the phase voltage U AC The high input voltage section is within the full input voltage range of the interleaved parallel PFC circuit 41. Since the loss of the inductor connected to the high-frequency bridge arm is more serious than the loss of the high-frequency switch tube in the high-frequency bridge arm in the high-frequency bridge arm, the controller 42 can control the duty cycle of the synchronous tube in the high-frequency bridge arm to be less than the preset duty cycle. In this way, the conduction time of the synchronous tube in one switch tube cycle can be relatively short, that is, the discharge time of the inductor in one switch tube cycle can be relatively short, so that the current flowing through the inductor will not drop to zero in one switch tube cycle, and the interleaved parallel PFC circuit 41 can be realized to work in CCM mode.

[0074] For the specific process of the interleaved parallel PFC circuit 41 operating in the CCM mode, please refer to Figure 2 and Figure 3 The relevant description of the illustrated embodiment will not be repeated here.

[0075] Continue reading Figure 5, the controller 42 is further configured to, when the phase voltage U output by the AC power supply AC is AC less than or equal to a preset voltage, control the duty cycle of the high-frequency switching tube that discharges the inductor in the high-frequency bridge arm to be greater than or equal to a preset duty cycle, that is, control the duty cycle of the synchronous tube in the high-frequency bridge arm to be greater than or equal to the preset duty cycle. Correspondingly, the duty cycle of the main tube in the high-frequency bridge arm is less than the preset duty cycle. Wherein, when the duty cycle of the high-frequency switching tube that discharges the inductor is greater than or equal to the preset duty cycle, the current flowing through the inductor passes through zero.

[0076] Specifically, the controller 42 may, when the phase voltage U output by the AC power supply AC is AC less than or equal to the preset voltage, confirm that the phase voltage U AC is in the low input voltage section within the full range of the input voltage of the interleaved PFC circuit 41. Since in the low input voltage section, compared with the loss of the inductor connected to the high-frequency bridge arm, the loss of the high-frequency switching tube in the high-frequency bridge arm is more serious, the controller 42 can control the duty cycle of the synchronous tube in the high-frequency bridge arm to be greater than or equal to the preset duty cycle. In this way, the conduction time of the synchronous tube within one switching tube cycle can be relatively long, that is, the discharge time of the inductor within one switching tube cycle can be relatively long, so that the current flowing through the inductor can drop below zero within one switching tube cycle, enabling the interleaved PFC circuit 41 to operate in the CRM mode or the TCM mode.

[0077] For the specific process of the interleaved PFC circuit 41 operating in the CRM mode or the TCM mode, reference can be made to Figure 2 and Figure 4 the relevant descriptions of the illustrated embodiments, which will not be elaborated here.

[0078] Based on the above design, the controller 42 can control the interleaved PFC circuit 41 to operate in the CCM mode in the high input voltage section within the full range of the input voltage of the interleaved PFC circuit 41, and control the interleaved PFC circuit to operate in the CRM mode or the TCM mode in the low input voltage section within the full range of the input voltage of the interleaved PFC circuit 41. In this way, both in the high input voltage section where the inductor loss is more serious, the current ripple flowing through the inductor can be reduced through the CCM mode, thereby reducing the inductor loss and improving the performance indicators such as the THD and PD of the power module 11, and in the low input voltage section where the high-frequency switching tube loss is more serious, the soft turn-on of the high-frequency switching tube can be achieved through the CRM mode or the TCM mode, thereby reducing the loss of the high-frequency switching tube. Furthermore, the loss of the interleaved PFC circuit 41 within the full range of the input voltage can be reduced, and the efficiency and operation stability of the power module 40 can be improved.

[0079] The following further describes the duty cycle of the high-frequency switching transistor that allows the inductor to discharge in the high-frequency bridge arm by the controller 42 in combination with the specific circuit structure of the interleaved parallel PFC circuit 41.

[0080] Figure 6 And Figure 7 respectively show the specific structural schematic diagrams of the power supply module 40 provided by the embodiments of the present application. Figure 5 shown.

[0081] In some embodiments, in combination with Figure 6 and Figure 7 , the number of high-frequency bridge arms and inductors in the interleaved parallel PFC circuit 41 can be multiple respectively. For example, the interleaved parallel PFC circuit 41 includes a high-frequency bridge arm 411a, a high-frequency bridge arm 411b, an inductor La, and an inductor Lb. And, the interleaved parallel PFC circuit 41 further includes a low-frequency bridge arm 412 and an output capacitor C2. The low-frequency bridge arm 412 includes two series-connected low-frequency switching transistors or two series-connected diodes.

[0082] Among them, the bridge arm midpoint a1 of the high-frequency bridge arm 411a and the bridge arm midpoint a2 of the high-frequency bridge arm 411b are respectively connected to one end of the inductor L1 and one end of the inductor L2. The common point a3 after the other ends of the inductor La and the inductor Lb are connected, and the bridge arm midpoint a4 of the low-frequency bridge arm 412 serve as a set of input terminals of the interleaved parallel PFC circuit 41 and are used to connect to the AC power supply AC. For specific descriptions, reference can be made to Figure 2 the relevant descriptions of the shown embodiments, which will not be elaborated here.

[0083] In some embodiments, the controller 42 is used to control the duty cycles of the high-frequency switching transistors that allow the inductor L1 to discharge in the high-frequency bridge arm 411a and the high-frequency switching transistors that allow the inductor L2 to discharge in the high-frequency bridge arm 411b to be less than the preset duty cycle when the phase voltage U AC output by the AC power supply AC is greater than the preset voltage. In addition, the controller 42 is further used to control the duty cycles of the high-frequency switching transistors that allow the inductor L1 to discharge in the high-frequency bridge arm 411a and the high-frequency switching transistors that allow the inductor L2 to discharge in the high-frequency bridge arm 411b to be greater than or equal to the preset duty cycle when the phase voltage U AC output by the AC power supply AC is less than or equal to the preset voltage.

[0084] Based on the above design, in the high input voltage section within the full range of the input voltage of the interleaved parallel PFC circuit 41, the conduction time of the synchronous transistors in the high-frequency bridge arm 411a and the high-frequency bridge arm 411b within the switching transistor cycle can be made relatively short, so that the current flowing through the inductor L1 and the inductor L2 will not drop to zero, enabling the interleaved parallel PFC circuit to operate in the CCM mode. And in the low input voltage section within the full range of the input voltage of the interleaved parallel PFC circuit 41, the conduction time of the synchronous transistors in the high-frequency bridge arm 411a and the high-frequency bridge arm 411b within the switching transistor cycle can be made relatively long, so that the current flowing through the inductor L1 and the inductor L2 drops through the zero-crossing point, enabling the interleaved parallel PFC circuit to operate in the CRM mode or the TCM mode. Furthermore, the losses of the interleaved parallel PFC circuit 41 within the full range of the input voltage can be reduced, improving the efficiency and operation stability of the power supply module 40. For specific descriptions, reference can be made to Figure 5 the relevant descriptions of the illustrated embodiments, which will not be elaborated here.

[0085] In some embodiments, continuing to combine Figure 6 and Figure 7 , in the interleaved parallel PFC circuit 41, the source of one high-frequency switching transistor in each high-frequency bridge arm is connected to the drain of the other high-frequency switching transistor. For example, in the high-frequency bridge arm 411a, the source of the high-frequency switching transistor S1 is connected to the drain of the high-frequency switching transistor S2 to form the bridge arm midpoint a1. In the high-frequency bridge arm 411b, the source of the high-frequency switching transistor S3 is connected to the drain of the high-frequency switching transistor S4 to form the bridge arm midpoint a2.

[0086] In one example, as Figure 6 shown, when the phase voltage U AC output by the AC power supply AC is in the positive half-cycle, the current I output by the AC power supply AC flows into the interleaved parallel PFC circuit 41 from the common point a3 and flows out of the interleaved parallel PFC circuit 41 from the bridge arm midpoint a4. In this case, the high-frequency switching transistor that discharges the inductor L1 in the high-frequency bridge arm 411a is the high-frequency switching transistor S1, and the high-frequency switching transistor that discharges the inductor L2 in the high-frequency bridge arm 411b is the high-frequency switching transistor S3. That is, when the phase voltage U AC is in the positive half-cycle, the synchronous transistors in the high-frequency bridge arm 411a and the high-frequency bridge arm 411b are the high-frequency switching transistor S1 and the high-frequency switching transistor S3 respectively.

[0087] It should be understood that the relevant descriptions regarding the high-frequency switching transistors S1 and S3 acting as synchronous transistors can be referred to Figure 2 the relevant descriptions of the high-frequency switching transistor Sb1 acting as a synchronous transistor shown, which will not be elaborated here.

[0088] Based on the above design, when the phase voltage U ACWhen in the positive half - cycle, the controller 42 can control the duty cycles of the high - frequency switching tubes S1 and S3 acting as synchronous tubes, so that the interleaved parallel PFC circuit 41 operates in the CCM mode in the high - input - voltage section within the full range of the input voltage, and operates in the CRM mode or TCM mode in the low - input - voltage section within the full range of the input voltage. Furthermore, the losses of the interleaved parallel PFC circuit 41 within the full range of the input voltage can be reduced, and the efficiency and operation stability of the power supply module 40 can be improved.

[0089] Furthermore, Figure 8 Exemplarily shown is Figure 6 the phase voltage U of the AC power supply AC output shown AC When in the positive half - cycle, the phase voltage U AC and the waveform schematic diagram of the current flowing through the inductor L1.

[0090] As Figure 8 shown, a positive half - cycle of the phase voltage U AC is from 0 to t3. Among them, from 0 to t1 and from t2 to t3, the phase voltage U AC output by the AC power supply AC is less than or equal to the preset voltage, the current flowing through the inductor L1 passes through zero in each switching - tube cycle, and the interleaved parallel PFC circuit 41 operates in the CRM mode or TCM mode. In addition, from t1 to t2, the phase voltage U AC output by the AC power supply AC is greater than the preset voltage, the current flowing through the inductor L1 does not pass through zero in each switching - tube cycle, and the interleaved parallel PFC circuit operates in the CCM mode. Furthermore, the losses of the interleaved parallel PFC circuit 41 within a positive half - cycle of the phase voltage U AC can be reduced, and the efficiency and operation stability of the power supply module 40 can be improved.

[0091] In another example, as Figure 7 shown, when the phase voltage U AC output by the AC power supply AC is in the negative half - cycle, the current I output by the AC power supply AC flows into the interleaved parallel PFC circuit 41 from the mid - point a4 of the bridge arm and flows out of the interleaved parallel PFC circuit 41 from the common point P3. In this case, the high - frequency switching tube that discharges the inductor L1 in the high - frequency bridge arm 411a is the high - frequency switching tube S2, and the high - frequency switching tube that discharges the inductor L2 in the high - frequency bridge arm 411b is the high - frequency switching tube S4. That is to say, when the phase voltage U AC is in the negative half - cycle, the synchronous tubes in the high - frequency bridge arm 411a and the high - frequency bridge arm 411b are the high - frequency switching tubes S2 and S4 respectively.

[0092] Based on the above design, when the phase voltage U ACWhen in the negative half-cycle, the controller 42 can control the duty cycles of the high-frequency switching tubes S2 and S4 acting as synchronous tubes, so that the interleaved parallel PFC circuit 41 operates in the CCM mode in the high input voltage section within the full range of the input voltage, and operates in the CRM mode or the TCM mode in the low input voltage section within the full range of the input voltage. Furthermore, the loss of the interleaved parallel PFC circuit 41 within the full range of the input voltage can be reduced, and the efficiency and operation stability of the power supply module 40 can be improved.

[0093] It should be understood that in the embodiments of the present application, the controller 42 can, when starting the interleaved parallel PFC circuit 41, or can also, after the interleaved parallel PFC circuit 41 is started, based on the phase voltage U output by the AC power supply AC AC control the working mode of the interleaved parallel PFC circuit 41.

[0094] For example, Figure 9 is a schematic flow chart of an example in which the controller 42 controls the working mode of the interleaved parallel PFC circuit 41 provided by the embodiments of the present application.

[0095] In some embodiments, referring to Figure 9 , the controller 42 can be used to, when starting the interleaved parallel PFC circuit 41, first obtain the phase voltage U output by the AC power supply AC AC , and then determine whether the phase voltage U AC is greater than a preset voltage.

[0096] In one example, referring to Figure 9 , the controller 42 is used to, when starting the interleaved parallel PFC circuit 41, when the phase voltage U output by the AC power supply AC AC is greater than the preset voltage, control the duty cycle of the high-frequency switching tube that discharges the inductor in the high-frequency bridge arm of the interleaved parallel PFC circuit 41 to be less than the preset duty cycle.

[0097] For example, in combination with Figure 6 and Figure 9 , the controller 42 can, when starting the interleaved parallel PFC circuit 41, first obtain the phase voltage U output by the AC power supply AC AC , and then, when the phase voltage U AC is in the positive half-cycle and the phase voltage U AC is greater than the preset voltage, control the duty cycles of the high-frequency switching tubes S1 and S3 to be less than the preset duty cycle, so that the interleaved parallel PFC circuit 41 operates in the CCM mode after starting.

[0098] Based on the above design, when the phase voltage U output by the AC power supply AC when starting the interleaved parallel PFC circuit 41 ACWhen in the high input voltage range within the full input voltage range of the interleaved PFC circuit 41, the controller 42 can control the interleaved PFC circuit 41 to operate in the CCM mode after startup. Since in the high input voltage range, the loss of the inductor connected to the high-frequency bridge arm is more serious than the loss of the high-frequency switching transistors in the high-frequency bridge arm, the above design can better reduce the inductor loss through the CCM mode after the interleaved PFC circuit 41 starts up, thereby improving the efficiency and operation stability of the interleaved PFC circuit 41 after startup.

[0099] In another example, referring to Figure 9 , the controller 42 is used to control the duty cycle of the high-frequency switching transistor that discharges the inductor in the high-frequency bridge arm of the interleaved PFC circuit 41 to be greater than or equal to a preset duty cycle when the phase voltage U AC output by the AC power supply AC is less than or equal to a preset voltage when the interleaved PFC circuit 41 starts up.

[0100] For example, in combination with Figure 6 and Figure 9 , the controller 42 can control the duty cycles of the high-frequency switching transistor S1 and the high-frequency switching transistor S3 to be greater than or equal to a preset duty cycle when starting the interleaved PFC circuit 41, when the phase voltage U AC is in the positive half cycle and the phase voltage U AC is less than or equal to a preset voltage, so that the interleaved PFC circuit 41 operates in the CRM mode or the TCM mode after startup.

[0101] Based on the above design, when the phase voltage U AC output by the AC power supply AC is in the low input voltage range within the full input voltage range of the interleaved PFC circuit 41 when the interleaved PFC circuit 41 starts up, the controller 42 can control the interleaved PFC circuit 41 to operate in the CRM mode or the TCM mode after startup. Since in the low input voltage range, the loss of the high-frequency switching transistors in the high-frequency bridge arm is more serious than the loss of the inductor connected to the high-frequency bridge arm, the above design can achieve soft turn-on of the high-frequency switching transistors through the CRM mode or the TCM mode after the interleaved PFC circuit 41 starts up, thereby better reducing the loss of the high-frequency switching transistors and improving the efficiency and operation stability of the interleaved PFC circuit 41 after startup.

[0102] In some embodiments, continuing to refer to Figure 9 , after controlling the interleaved PFC circuit 41 to start up in the CCM mode, or in the CRM mode or the TCM mode, the controller 42 can continue to obtain the phase voltage U AC output by the AC power supply AC, and judge the phase voltage U ACWhether it is greater than a preset voltage, so as to flexibly switch the operating mode of the interleaved parallel PFC circuit 41.

[0103] In one example, refer to Figure 9 , when the duty cycle of the high-frequency switching transistor for discharging the inductor in the high-frequency bridge arm of the interleaved parallel PFC circuit 41 is greater than or equal to a preset duty cycle, that is, when the interleaved parallel PFC circuit 41 operates in the CRM mode or the TCM mode, when the phase voltage U AC output by the AC power supply AC is greater than the preset voltage, the duty cycle of the high-frequency switching transistor for discharging the inductor is reduced.

[0104] Specifically, after the interleaved parallel PFC circuit 41 starts in the CRM mode or the TCM mode, the controller 42 can obtain the phase voltage U AC output by the AC power supply AC in real time or regularly, and judge whether the phase voltage U AC is greater than the preset voltage.

[0105] Furthermore, when the phase voltage U AC is less than or equal to the preset voltage, the controller 42 controls the duty cycle of the high-frequency switching transistor for discharging the inductor in the high-frequency bridge arm to remain greater than or equal to the preset duty cycle state, so that the interleaved parallel PFC circuit 41 still operates in the CRM mode or the TCM mode.

[0106] When the phase voltage U AC is greater than the preset voltage, the controller 42 can reduce the duty cycle of the synchronous transistor in the high-frequency bridge arm, so that the current flowing through the inductor can be switched from passing through zero to not passing through zero within the switching transistor cycle. For example, taking Figure 6 the shown phase voltage U AC in the positive half cycle as an example, the controller 42 can reduce the duty cycles of the high-frequency switching transistors S1 and S3 to less than the preset duty cycle, so that the currents flowing through the inductors L1 and L2 can be switched from passing through zero to not passing through zero. Thus, the operating mode of the interleaved parallel PFC circuit 41 is switched from the CRM mode or the TCM mode to the CCM mode.

[0107] Exemplarily, the controller 42 can keep the off time of the synchronous transistor unchanged within the switching transistor cycle, and reduce the on time of the synchronous transistor within the switching transistor cycle to achieve reducing the duty cycle of the synchronous transistor. That is, when the operating mode of the interleaved parallel PFC circuit 41 is switched from the CRM mode or the TCM mode to the CCM mode, the switching frequency of the synchronous transistor increases.

[0108] Based on the above design, when the interleaved parallel PFC circuit 41 operates in the CRM mode or the TCM mode after startup, the controller 42 can, when the phase voltage U ACWhen reaching a high input voltage segment greater than the preset voltage, the operating mode of the interleaved parallel PFC circuit 41 is controlled to switch from the CRM mode or the TCM mode to the CCM mode. Since in the high input voltage segment, compared with the loss of the high-frequency switching transistors in the high-frequency bridge arm, the loss of the inductor connected to the high-frequency bridge arm is more serious. Therefore, switching the operating mode of the interleaved parallel PFC circuit 41 to the CCM mode can better reduce the inductor loss, thereby improving the efficiency and operating stability of the interleaved parallel PFC circuit 41 during operation.

[0109] It should be understood that when the controller 42 switches the operating mode of the interleaved parallel PFC circuit 41, the preset voltage can be determined by calculating the moment when the losses of the interleaved parallel PFC circuit 41 in different operating modes are the same.

[0110] For example, referring to Figure 6 , assuming that the loss of the PFC circuit 41 when operating in the CCM mode is the same as the loss when operating in the TCM mode at time t1, then the phase voltage U AC corresponding to time t1 can be determined as the preset voltage. In this way, when the phase voltage U AC output by the AC power supply AC is less than the phase voltage U AC corresponding to time t1, it can be considered that the loss of the interleaved parallel PFC circuit 41 when operating in the TCM mode is less than the loss when operating in the CCM mode. Conversely, when the phase voltage U AC output by the AC power supply AC is greater than the phase voltage U AC corresponding to time t1, it can be considered that the loss of the interleaved parallel PFC circuit 41 when operating in the TCM mode is greater than the loss when operating in the CCM mode.

[0111] In another example, as Figure 9 shown, when the duty cycle of the high-frequency switching transistor used by the controller 42 to discharge the inductor in the high-frequency bridge arm of the interleaved parallel PFC circuit 41 is less than the preset duty cycle, that is, when the interleaved parallel PFC circuit 41 operates in the CCM mode, when the phase voltage U AC output by the AC power supply AC is less than or equal to the preset voltage, the duty cycle of the high-frequency switching transistor that discharges the inductor is increased.

[0112] Specifically, after the interleaved parallel PFC circuit 41 starts in the CCM mode, the controller 42 can obtain the phase voltage U AC output by the AC power supply AC in real time or regularly, and determine whether the phase voltage U AC is greater than the preset voltage.

[0113] Furthermore, when the phase voltage U ACWhen the voltage is greater than the preset voltage, the controller 42 controls the duty cycle of the high-frequency switching tube that discharges the inductor in the high-frequency bridge arm to remain less than the preset duty cycle, so that the interleaved parallel PFC circuit 41 still operates in the CCM mode.

[0114] When the phase voltage U AC is less than or equal to the preset voltage, the controller 42 can increase the duty cycle of the synchronous tube in the high-frequency bridge arm, so that the current flowing through the inductor can be switched from not passing through zero to passing through zero within the switching tube period. For example, taking Figure 6 the shown phase voltage U AC in the positive half cycle as an example, the controller 42 can increase the duty cycles of the high-frequency switching tube S1 and the high-frequency switching tube S3, so that the currents flowing through the inductor L1 and the inductor L2 can be switched from not passing through zero to passing through zero. Thus, the operation mode of the interleaved parallel PFC circuit 41 is switched from the CCM mode to the CRM mode or the TCM mode.

[0115] Exemplarily, the controller 42 can keep the off time of the synchronous tube unchanged within the switching tube period and increase the on time of the synchronous tube within the switching tube period to increase the duty cycle of the synchronous tube. That is, when the operation mode of the interleaved parallel PFC circuit 41 is switched from the CCM mode to the CRM mode or the TCM mode, the switching frequency of the synchronous tube decreases.

[0116] Based on the above design, when the interleaved parallel PFC circuit 41 operates in the CCM mode after startup, the controller 42 can control the operation mode of the interleaved parallel PFC circuit 41 to be switched from the CCM mode to the CRM mode or the TCM mode when the phase voltage U AC output by the AC power supply AC reaches the low input voltage section less than or equal to the preset voltage. Since in the low input voltage section, compared with the loss of the inductor connected to the high-frequency bridge arm, the loss of the high-frequency switching tube in the high-frequency bridge arm is more serious. Therefore, switching the operation mode of the interleaved parallel PFC circuit 41 to the CRM mode or the TCM mode can better reduce the loss of the high-frequency switching tube, thereby improving the efficiency and operation stability of the interleaved parallel PFC circuit 41 during operation.

[0117] The embodiment of the present application further provides a power supply device, which includes a plurality of the power supply modules 40 described in the above embodiments. The plurality of power supply modules 40 are connected in parallel and are used to supply power to a load.

[0118] It should be understood that in the embodiment of the present application, the power supply device can be, for example, a device for providing electric energy in scenarios such as communication base stations, data centers, charging stations, energy storage systems or photovoltaic systems. For specific descriptions, reference can be made to Figure 1 the relevant descriptions of the shown embodiments, which will not be elaborated here.

[0119] As described above, it is only the specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present application can easily think of changes or substitutions, which should all be covered within the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claimed rights.

Claims

1. A power supply module, characterized in that, The power supply module includes an interleaved parallel power factor correction (PFC) circuit and a controller. The interleaved parallel PFC circuit includes an inductor and a high-frequency bridge arm. The high-frequency bridge arm includes two series-connected high-frequency switching tubes. The midpoint of the bridge arm of the high-frequency bridge arm is used to connect to an AC power supply through the inductor. The controller is configured to: When the phase voltage output by the AC power supply to the interleaved parallel PFC circuit is greater than a preset voltage, control the duty cycle of the high-frequency switching tube in the high-frequency bridge arm that discharges the inductor to be less than a preset duty cycle. Wherein, when the duty cycle of the high-frequency switching tube that discharges the inductor is less than the preset duty cycle, the current flowing through the inductor does not pass through zero. When the phase voltage is less than or equal to the preset voltage, control the duty cycle of the high-frequency switching tube that discharges the inductor to be greater than or equal to the preset duty cycle. Wherein, when the duty cycle of the high-frequency switching tube that discharges the inductor is greater than or equal to the preset duty cycle, the current flowing through the inductor passes through zero.

2. The power supply module according to claim 1, wherein The controller is configured to, when the interleaved parallel PFC circuit starts up: When the phase voltage is greater than the preset voltage, control the duty cycle of the high-frequency switching tube that discharges the inductor to be less than the preset duty cycle.

3. The power supply module according to claim 1, characterized in that, The controller is configured to, when the duty cycle of the high-frequency switching tube that discharges the inductor is greater than or equal to the preset duty cycle: When the phase voltage is greater than the preset voltage, reduce the duty cycle of the high-frequency switching tube that discharges the inductor.

4. The power supply module according to claim 1, characterized in that, The controller is configured to, when the interleaved parallel PFC circuit starts up: When the phase voltage is less than or equal to the preset voltage, control the duty cycle of the high-frequency switching tube that discharges the inductor to be greater than or equal to the preset duty cycle.

5. The power supply module according to claim 1, characterized in that The controller is configured to, when the duty cycle of the high-frequency switching tube that discharges the inductor is less than the preset duty cycle: When the phase voltage is less than or equal to the preset voltage, increase the duty cycle of the high-frequency switching tube that discharges the inductor.

6. The power supply module according to any one of claims 1 to 5, characterized in that The number of the high-frequency bridge arms and the inductor are both multiple. The interleaved parallel PFC circuit further includes a low-frequency bridge arm. The low-frequency bridge arm is connected in parallel with the multiple high-frequency bridge arms. The midpoint of one bridge arm of a high-frequency bridge arm is connected to one end of an inductor. The common point after the other ends of the multiple inductors are connected together, and the midpoint of the low-frequency bridge arm serve as a set of input terminals of the interleaved parallel PFC circuit and are used to connect to the AC power supply. The controller is configured to: When the phase voltage is greater than the preset voltage, control the duty cycle of the high-frequency switching tube in each high-frequency bridge arm that discharges the inductor to be less than the preset duty cycle. When the phase voltage is less than or equal to the preset voltage, control the duty cycle of the high-frequency switching tube in each high-frequency bridge arm that discharges the inductor to be greater than or equal to the preset duty cycle.

7. The power supply module according to claim 6, wherein The source electrode of one high-frequency switching tube in each high-frequency bridge arm is connected to the drain electrode of the other high-frequency switching tube. The controller is configured to, when the phase voltage is in the positive half-cycle and the current output by the AC power supply flows into the interleaved PFC circuit from the common point: When the phase voltage is greater than the preset voltage, control the duty cycle of one of the high-frequency switching transistors in each high-frequency bridge arm to be less than the preset duty cycle; When the phase voltage is less than or equal to the preset voltage, control the duty cycle of one of the high-frequency switching transistors in each high-frequency bridge arm to be greater than or equal to the preset duty cycle.

8. The power supply module according to claim 6, wherein, The source electrode of one of the high-frequency switching transistors in each high-frequency bridge arm is connected to the drain electrode of the other high-frequency switching transistor; The controller is configured to, when the phase voltage is in the negative half-cycle and the current output by the AC power supply flows into the interleaved PFC circuit from the midpoint of the low-frequency bridge arm: When the phase voltage is greater than the preset voltage, control the duty cycle of the other high-frequency switching transistor in each high-frequency bridge arm to be less than the preset duty cycle; When the phase voltage is less than or equal to the preset voltage, control the duty cycle of the other high-frequency switching transistor in each high-frequency bridge arm to be greater than or equal to the preset duty cycle.

9. The power supply module according to any one of claims 6 to 8, characterized in that, The low-frequency bridge arm includes two diodes connected in series, or the low-frequency bridge arm includes two low-frequency switching transistors connected in series.

10. A power supply device, characterized in that, The power supply device includes a plurality of power supply modules as described in any one of claims 1 to 9, the plurality of power supply modules are connected in parallel, and the plurality of power supply modules are used to supply power to a load.

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