Control method, control device, medium, processor and switching power supply

Abstract

The invention discloses a control method, a control device, a medium, a processor and a switching power supply, and the control method comprises the steps: the driving pulses of a switching tube S1 and a switching tube S2 are complementary, and the duty ratio adjustment range is [0, 1]; driving pulses of the switching tube S3 and the switching tube S4 are complementary, and the duty ratio adjusting range is [0, 1]; the power factor correction of the alternating current side is realized by adjusting the duty ratio of a switching tube S1 and the duty ratio of a switching tube S3, and the adjusting strategy is as follows: when the instantaneous value of an alternating current voltage source is greater than or equal to 0, the driving pulse of the switching tube S3 lags behind the switching tube S1, the phase difference between the driving pulse of the switching tube S1 and the driving pulse of the switching tube S3 is theta 1, and the adjusting range of theta 1 is [0, 180 degrees]; when the instantaneous value of the alternating current voltage source is smaller than 0, the driving pulse of the switching tube S3 is ahead of the switching tube S1, the phase difference between the driving pulse of the switching tube S1 and the driving pulse of the switching tube S3 is theta 2, and the adjusting range of theta 2 is [-180 degrees, 0]. According to the invention, switching tubes can be reduced, the cost is reduced, and the ripple of PFC inductive current is reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of power supply, and in particular relates to a control method, a control device, a medium, a processor and a switching power supply. Background Art

[0002] With the increasing popularity of electric vehicles, the application of bidirectional charging technology in on-board charging and battery formation has been vigorously developed. The Totem Bridgeless PFC circuit is widely used in power factor correction circuits due to its advantages of simple structure, high efficiency and low cost. In order to further improve the operating efficiency, its subsequent circuit can usually be connected to LC, LLC, CLLC and other resonant cavities to achieve soft switching function, which further promotes the application of Totem Bridgeless PFC in high-power occasions.

[0003] In the two-stage architecture, since a circuit is added to the rear stage for voltage gain adjustment, and the front and rear stages are controlled independently, it brings convenience to both power factor correction and rear stage output voltage control, reduces the coupling between each stage, and simplifies the circuit design. However, due to the large number of switch tubes in the two-stage architecture, the hardware cost is increased. Based on this, in 2015, Mahdi Ghasemi proposed a single-stage bridgeless PFC+LLC structure in the paper "Analyzing a Bridgeless Single Stage LLC Resonant PFC Converter Controlled by Frequency and Pulse Width Modulations Techniques", which uses frequency and pulse width modulation technology to control the PFC function and soft switching function, and significantly reduces switching loss and electromagnetic interference noise. On the other hand, the bridgeless structure reduces conduction loss by eliminating two bridge diodes. However, since the scheme uses uncontrollable diodes in the single-stage structure and adopts DCM boost control, the bus capacitor voltage is too high and the AC side PFC inductor current ripple is large. In the patent "Single-stage isolated LED driver power supply based on GaN devices" with publication number CN209593841U filed by Wuxi Youdian Technology Co., Ltd. in 2018, the diode in the totem bridgeless PFC circuit is changed to an industrial frequency MOS tube, which is alternately turned on according to the industrial frequency control, reducing the conduction loss of the tube. However, this control method also adopts the DCM control method, the bus voltage is high, and the AC side PFC inductor current ripple is large. In the PCT application "Charger for wideinput / output voltage regulation" with publication number WO2023193914A1 filed by Huawei Digital Energy Technology Co., Ltd. in 2022, based on the totem bridgeless PFC+LLC architecture, it adopts an industrial frequency bridge arm + high frequency bridge arm structure, combined with variable frequency control + pulse power transmission control, in which the pulse power transmission method is achieved by reducing pulses. This solution will further increase the ripple of the PFC inductor current. In the PCT application "Ac / dc power converter" with publication number WO2023217372A1 filed by Huawei Digital Energy Technology Co., Ltd. in 2022, based on the totem bridgeless PFC+LLC architecture, it adopts an industrial frequency bridge arm + high-frequency bridge arm structure, combined with variable frequency + PWM control method. Since the industrial frequency tube is turned off in the zero-crossing area and turned on with industrial frequency complementation after zero crossing, its PFC inductor current ripple is still large.

[0004] It should be noted that the above information disclosed in the background technology section is only intended to deepen the understanding of the overall background technology of this application, and should not be regarded as admitting or suggesting in any form that the information constitutes prior art already known to those skilled in the art.

[0005] The disclosure of the above background technology content is only used to assist in understanding the concept and technical solution of the present application. It does not necessarily belong to the prior art of the present patent application. In the absence of clear evidence that the above content has been disclosed on the filing date of the present patent application, the above background technology should not be used to evaluate the novelty and creativity of the present application. Summary of the invention

[0006] The technical problem to be solved by the present invention is to provide a control method, a control device, a medium, a processor and a switching power supply, which at least solve one of the technical problems existing in the prior art to a certain extent.

[0007] As a first aspect of the present invention, the technical solution of the embodiment of the control method provided is as follows:

[0008] A control method for controlling a switch tube of a switching power supply, wherein the switching power supply comprises a PFC inductor, a power frequency bridge arm, a high frequency bridge arm, a bus capacitor and a post-stage circuit, wherein the power frequency bridge arm comprises a switch tube S1 and a switch tube S2, and the high frequency bridge arm comprises a switch tube S3 and a switch tube S4, wherein the switch tube S1 and the switch tube S3 are upper bridge arm switch tubes, and the switch tube S2 and the switch tube S4 are lower bridge arm switch tubes, wherein the control method comprises:

[0009] The driving pulses of the switch tube S1 and the switch tube S2 are complementary, and the duty cycle adjustment range is [0, 1];

[0010] The driving pulses of the switch tube S3 and the switch tube S4 are complementary, and the duty cycle adjustment range is [0, 1];

[0011] By adjusting the duty cycle D of the switch tube S1 S1 and the duty cycle D of the switch tube S3 S3 To achieve power factor correction on the AC side, the adjustment strategy is as follows:

[0012] When the AC voltage source v ac When the instantaneous value is greater than or equal to 0, the driving pulse of the switch tube S3 lags behind the driving pulse of the switch tube S1, and the phase difference between the driving pulse of the switch tube S1 and the driving pulse of the switch tube S3 is θ1, and the adjustment range of θ1 is [0,180°];

[0013] When the AC voltage source v acWhen the instantaneous value is less than 0, the driving pulse of the switch tube S3 is ahead of the driving pulse of the switch tube S1, and the phase difference between the driving pulse of the switch tube S1 and the driving pulse of the switch tube S3 is θ2, and the adjustment range of θ2 is [-180°, 0].

[0014] Furthermore, when the AC voltage source v ac When the instantaneous value is greater than or equal to zero, the on-time and off-time of the driving pulse of the switch tube S3 are both located between the on-time and off-time of the driving pulse of the switch tube S1;

[0015] And when the AC voltage source v ac When the instantaneous value is less than zero, the turn-on time and turn-off time of the drive pulse of the switch tube S1 are both located between the turn-on time and turn-off time of the drive pulse of the switch tube S3.

[0016] Furthermore, the driving pulse of the switch tube S1 is centrally symmetrical with the driving pulse of the switch tube S3.

[0017] Furthermore, the turn-on timings of the driving pulse of the switch tube S1 and the driving pulse of the switch tube S3 are aligned.

[0018] Furthermore, the turn-off time of the driving pulse of the switch tube S1 is aligned with the turn-off time of the driving pulse of the switch tube S3.

[0019] Furthermore, the switching frequency of the high-frequency bridge arm switch tube is consistent with the switching frequency of the industrial frequency bridge arm switch tube.

[0020] Furthermore, the on-time or off-time of the drive pulse of the switch tube S1 is between the on-time and off-time of the drive pulse of the switch tube S3, and the off-time or on-time of the drive pulse of the switch tube S1 is not between the on-time and off-time of the drive pulse of the switch tube S3.

[0021] Furthermore, when the AC voltage source v ac The instantaneous value is greater than or equal to zero and satisfies |v ac |≥V b When the duty cycle of the switch tube S1 is 1; when the AC voltage source v ac The instantaneous value is less than zero and satisfies |v ac |≥V b When the duty cycle of the switch tube S1 is 0; when the instantaneous value of the AC voltage source |v ac |∈[-V b ,V b ], the duty cycle D of the switch tube S1 S1 =|v ac / V m |; Among them, V b is the set voltage boundary, and V b ∈[0.35Vbus ,0.65V bus ],V bus is the DC component of the bus capacitor voltage, V m is the AC voltage source v ac peak value.

[0022] As a second aspect of the present invention, the technical solution of the embodiment of the control device provided is as follows:

[0023] A control device for controlling a switch tube of a switching power supply, wherein the switching power supply comprises an AC voltage source, a PFC inductor, a power frequency bridge arm, a high frequency bridge arm, a bus capacitor and a post-stage circuit, wherein the power frequency bridge arm comprises a switch tube S1 and a switch tube S2, and the high frequency bridge arm comprises a switch tube S3 and a switch tube S4, wherein the switch tube S1 and the switch tube S3 are upper bridge arm switch tubes, and the switch tube S2 and the switch tube S4 are lower bridge arm switch tubes, wherein the control device comprises:

[0024] A first driving pulse providing unit is configured to provide driving pulses for the switch tube S1 and the switch tube S2, wherein the driving pulses of the switch tube S1 and the switch tube S2 are complementary, and the duty cycle adjustment range is [0, 1];

[0025] A second driving pulse providing unit is configured to provide driving pulses for the switch tube S3 and the switch tube S4, the driving pulses of the switch tube S3 and the switch tube S4 are complementary, and the duty cycle adjustment range is [0, 1];

[0026] The power factor correction unit is configured to adjust the duty cycle D of the switch tube S1. S1 And the duty cycle D of switch tube S3 S3 To achieve power factor correction on the AC side, the adjustment strategy is as follows:

[0027] When the AC voltage source v ac When the instantaneous value is greater than or equal to 0, the driving pulse of the switch tube S3 lags behind the driving pulse of the switch tube S1, and the phase difference between the driving pulse of the switch tube S1 and the driving pulse of the switch tube S3 is θ1, and the adjustment range of θ1 is [0,180°];

[0028] When the AC voltage source v ac When the instantaneous value is less than 0, the driving pulse of the switch tube S3 is ahead of the driving pulse of the switch tube S1, and the phase difference between the driving pulse of the switch tube S1 and the driving pulse of the switch tube S3 is θ2, and the adjustment range of θ2 is [-180°, 0].

[0029] As a third aspect of the present invention, an embodiment of a computer-readable storage medium is provided as follows:

[0030] A computer-readable storage medium, wherein the computer-readable storage medium includes a stored program, wherein the program executes the control method described in any one of the first aspects above.

[0031] As a fourth aspect of the present invention, an embodiment of a processor is provided as follows:

[0032] A processor, wherein the processor is used to run a program, wherein when the program is run, the control method of the switching power supply described in any one of the first aspects above is executed.

[0033] As a fifth aspect of the present invention, an embodiment of a switching power supply is provided as follows:

[0034] A switching power supply, comprising a PFC inductor, an industrial frequency bridge arm, a high frequency bridge arm, a bus capacitor and a post-stage circuit, wherein the industrial frequency bridge arm comprises a switch tube S1 and a switch tube S2, and the high frequency bridge arm comprises a switch tube S3 and a switch tube S4, wherein the switch tube S1 and the switch tube S3 are upper bridge arm switch tubes, and the switch tube S2 and the switch tube S4 are lower bridge arm switch tubes, wherein the switching power supply further comprises the control device described in any one of the second aspects above.

[0035] The beneficial effects of the present invention are:

[0036] (1) The control method of the embodiment of the present invention can realize the front-stage PFC function and the function of adjusting the control amount of the rear stage at the same time by multiplexing the front-stage and rear-stage of the high-frequency bridge arm. Therefore, compared with the two-stage architecture, the number of switches is reduced and the cost is reduced.

[0037] (2) In the control method of the embodiment of the present invention, the PFC inductor is charged and discharged twice in one switching cycle, which reduces the ripple of the PFC inductor current compared to the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 A first circuit schematic diagram of a switching power supply to which the control method of the present invention is applicable;

[0039] Figure 2A v ac ≥0, schematic diagram of the control method of the first embodiment of the present invention driving pulse center symmetry;

[0040] Figure 2B v ac <0, schematic diagram showing the central symmetry of the driving pulses of the control method of the first embodiment of the present invention;

[0041] Figure 3 A second circuit schematic diagram of a switching power supply to which the control method of the present invention is applicable;

[0042] Figure 4 A control principle diagram of a control method according to a first embodiment of the present invention;

[0043] Figure 5A v ac ≥0, a simulation waveform diagram of the control method of the first embodiment of the present invention;

[0044] Figure 5B v ac <0 is a simulation waveform diagram of the control method of the first embodiment of the present invention;

[0045] Explanation of the reference numerals: 1-AC voltage source; 2-PFC inductor; 3-power frequency bridge arm; 4-high frequency bridge arm; 5-bus capacitor; 6-post-stage circuit. DETAILED DESCRIPTION

[0046] The present invention and its beneficial effects will be further described in detail below in conjunction with specific implementations and the accompanying drawings, but the specific implementations of the present invention are not limited thereto.

[0047] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0048] It should be noted that the terms "including" and "having" and any variations thereof in the specification and claims of the present application and the above-mentioned drawings are intended to cover non-exclusive inclusions. For example, a process, method, system, product or apparatus comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or apparatuses.

[0049] In addition, the drawings of the present disclosure are only schematic diagrams of the present disclosure and are not necessarily drawn to scale. The same symbols in the drawings represent the same or similar parts, and thus repeated descriptions thereof will be omitted. Some of the block diagrams shown in the drawings are functional entities and do not necessarily correspond to physically or logically independent entities. These functional entities can be implemented using software, or implemented in one or more hardware modules or integrated circuits, or implemented in different networks and / or processor devices and / or microcontrollers.

[0050] First embodiment

[0051] This embodiment discloses a control method for controlling a switch tube of a switching power supply. Figure 1 The first circuit schematic diagram of the switching power supply to which the control method of the present invention is applicable, wherein the switching power supply includes a PFC inductor L b , power frequency bridge arm, high frequency bridge arm, bus capacitor C bus And the subsequent circuit, specifically, the industrial frequency bridge arm includes switch tubes S1 and S2, the high frequency bridge arm includes switch tubes S3 and S4, the switch tubes S1 and S3 are upper bridge arm switch tubes, and the switch tubes S2 and S4 are lower bridge arm switch tubes.

[0052] Figure 3 The second circuit schematic diagram of the switching power supply to which the control method of the present invention is applicable is as follows: Figure 3 As shown, the subsequent circuit provides a specific circuit topology, which is an LLC resonant circuit. The subsequent LLC resonant circuit includes a resonant capacitor C r , resonant inductor L r , transformer excitation inductance L m 、Transformer T r , secondary diode D1, secondary diode D2, output filter capacitor C o and load R L .

[0053] The control method of this embodiment is as follows:

[0054] The driving pulses of the switch tube S1 and the switch tube S2 are complementary, and the duty cycle adjustment range is [0,1];

[0055] The driving pulses of the switch tube S3 and the switch tube S4 are complementary, and the duty cycle adjustment range is [0,1];

[0056] By adjusting the duty cycle D of the switch tube S1 S1 And the duty cycle D of switch tube S3 S3 To achieve power factor correction on the AC side, the adjustment strategy is as follows:

[0057] When the AC voltage source v ac When the instantaneous value is greater than or equal to 0, the driving pulse of the switch tube S3 lags behind the driving pulse of the switch tube S1, and the phase difference between the driving pulse of the switch tube S1 and the driving pulse of the switch tube S3 is θ1, and the adjustment range of θ1 is [0,180°];

[0058] When the AC voltage source v ac When the instantaneous value is less than 0, the driving pulse of the switch tube S3 is ahead of the driving pulse of the switch tube S1, and the phase difference between the driving pulse of the switch tube S1 and the driving pulse of the switch tube S3 is θ2, and the adjustment range of θ2 is [-180°, 0].

[0059] The control method of this embodiment can realize the front-stage PFC function and the function of adjusting the control amount of the rear stage at the same time by multiplexing the front-stage and rear-stage of the high-frequency bridge arm. Therefore, compared with the two-stage architecture, the number of switching tubes is reduced and the cost is reduced. In addition, the PFC inductor is charged and discharged twice in one switching cycle, which reduces the ripple of the PFC inductor current compared with the prior art.

[0060] Furthermore, when the AC voltage source v ac The instantaneous value is greater than or equal to zero and satisfies |v ac |≥V b When the duty cycle of the switch tube S1 is 1; when the AC voltage source v ac The instantaneous value is less than zero and satisfies |v ac |≥V b When the duty cycle of the switch tube S1 is 0; when the instantaneous value of the AC voltage source |v ac |∈[-V b ,V b ], the duty cycle D of the switch tube S1 S1 =|v ac / V m |; Among them, V b is the set voltage boundary, and V b ∈[0.35V bus ,0.65V bus ],V bus is the DC component of the bus capacitor voltage, V m is the AC voltage source v ac Peak value; preferably, the voltage boundary V b =0.5V bus .

[0061] In the specific implementation of this embodiment, the switching frequency of the high-frequency bridge arm switch tube and the switching frequency of the industrial frequency bridge arm switch tube are set to be consistent.

[0062] In this embodiment, the duty cycle D of the power frequency bridge arm switch tube S1 is adjusted. S1 and the duty cycle D of the high-frequency bridge arm switch tube S3 S3 To achieve power factor correction on the AC side. Figure 3 The duty cycle D of the power frequency bridge arm switch tube S1 of the circuit shown S1 and the duty cycle D of the high-frequency bridge arm switch tube S3 S3 According to Figure 4 The control is performed in the manner shown, where u XY =u XN -u YN ,u XN is the voltage from point X in the middle of the power frequency bridge arm to the ground, u YN is the voltage from the middle point Y of the high-frequency bridge arm to the ground, u busis the instantaneous value of the bus capacitor voltage. It should be noted that uxy reflects a square wave with an amplitude of Vbus during the switching cycle. After filtering, it is actually a power frequency sine wave, that is, the period is the same as v ac Consistent, so u XY The frequency and AC voltage source v ac The frequency is consistent.

[0063] See also Figure 4 , where when the AC voltage source v ac When the instantaneous value is greater than or equal to zero, the on-time and off-time of the drive pulse of the switch tube S3 are both between the on-time and off-time of the drive pulse of the switch tube S1; when the AC voltage source v ac When the instantaneous value is less than zero, the turn-on time and turn-off time of the drive pulse of the switch tube S1 are both located between the turn-on time and turn-off time of the drive pulse of the switch tube S3.

[0064] against Figure 4 Control principle diagram, further, the driving pulse of the switch tube S1 and the driving pulse of the switch tube S3 are controlled in a centrally symmetrical manner, such as Figure 2A and Figure 2B .right Figure 3 The circuit shown in the figure is simulated, and the time domain simulation waveform is as follows Figure 5A and Figure 5B As shown, Figure 5A and Figure 5B Medium G S1 and G S3 The driving waveform of the switch tubes S1 and S3 shows that in one switching cycle, the PFC inductor L b Current i Lb Charge and discharge twice to reduce the current ripple. Figure 4 Control principle diagram, the optimal solution is to control the driving pulse of switch tube S1 and the driving pulse of switch tube S3 in a centrally symmetrical manner. When the requirement for PFC inductor current ripple is not high, a suboptimal solution can also be adopted, including: the turning-on time of the driving pulse of switch tube S1 and the driving pulse of switch tube S3 are aligned, or the turning-off time of the driving pulse of switch tube S1 and the driving pulse of switch tube S3 are aligned.

[0065] Furthermore, the switching frequency of the high-frequency bridge arm switch tube is consistent with the switching frequency of the industrial frequency bridge arm switch tube.

[0066] In this embodiment, when the PFC inductor current ripple requirement is not high, the turn-on moment or turn-off moment of the drive pulse of the switch tube S1 is located between the turn-on moment and the turn-off moment of the drive pulse of the switch tube S3, and the turn-off moment or turn-on moment of the drive pulse of the switch tube S1 is not located between the turn-on moment and the turn-off moment of the drive pulse of the switch tube S3.

[0067] Second embodiment

[0068] The present embodiment provides a control device for controlling a switch tube of a switching power supply, wherein the switching power supply includes an AC voltage source, a PFC inductor, a power frequency bridge arm, a high frequency bridge arm, a bus capacitor, and a post-stage circuit, wherein the power frequency bridge arm includes a switch tube S1 and a switch tube S2, and the high frequency bridge arm includes a switch tube S3 and a switch tube S4, wherein the switch tubes S1 and S3 are upper bridge arm switch tubes, and the switch tubes S2 and S4 are lower bridge arm switch tubes, wherein the control device includes:

[0069] A first driving pulse providing unit is configured to provide driving pulses for the switch tube S1 and the switch tube S2. The driving pulses of the switch tube S1 and the switch tube S2 are complementary, and the duty cycle adjustment range is [0, 1].

[0070] The second driving pulse providing unit is configured to provide driving pulses for the switch tube S3 and the switch tube S4. The driving pulses of the switch tube S3 and the switch tube S4 are complementary, and the duty cycle adjustment range is [0, 1].

[0071] The power factor correction unit is configured to adjust the duty cycle D of the switch tube S1. S1 And the duty cycle D of switch tube S3 S3 To achieve power factor correction on the AC side, the adjustment strategy is as follows:

[0072] When the AC voltage source v ac When the instantaneous value is greater than or equal to 0, the driving pulse of the switch tube S3 lags behind the driving pulse of the switch tube S1, and the phase difference between the driving pulse of the switch tube S1 and the driving pulse of the switch tube S3 is θ1, and the adjustment range of θ1 is [0,180°];

[0073] When the AC voltage source v ac When the instantaneous value is less than 0, the driving pulse of the switch tube S3 is ahead of the driving pulse of the switch tube S1, and the phase difference between the driving pulse of the switch tube S1 and the driving pulse of the switch tube S3 is θ2, and the adjustment range of θ2 is [-180°, 0].

[0074] The control device of this embodiment corresponds to the technical means of the control method of the first embodiment and has the same beneficial effects, which will not be described in detail here.

[0075] In addition, the preferred technical means or further improved means of each step in the control method of the first embodiment can be extended to the corresponding units of this embodiment, and this embodiment will not describe them one by one.

[0076] Third embodiment

[0077] If the unit integrated in the control device in the above-mentioned second embodiment is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions for a computer device (which can be a personal computer, a server or a network device, etc.) to perform all or part of the steps of the above-mentioned methods of each embodiment of the present invention. The aforementioned storage medium includes: U disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), mobile hard disk, magnetic disk or optical disk and other media that can store program codes.

[0078] Therefore, the third embodiment of the present invention provides a computer-readable storage medium, which includes a stored program, and the program executes the method of any specific implementation method of the first embodiment.

[0079] Fourth embodiment

[0080] A fourth embodiment of the present invention provides a processor for running a program, wherein the program executes a method of any specific implementation method of the first embodiment when running.

[0081] Fifth embodiment

[0082] The present embodiment provides a switching power supply, which includes a PFC inductor, an industrial frequency bridge arm, a high-frequency bridge arm, a bus capacitor and a post-stage circuit. The industrial frequency bridge arm includes a switch tube S1 and a switch tube S2, and the high-frequency bridge arm includes a switch tube S3 and a switch tube S4. The switch tubes S1 and S3 are upper bridge arm switch tubes, and the switch tubes S2 and S4 are lower bridge arm switch tubes. The switching power supply also includes any one of the control devices in the second embodiment above.

[0083] The switching tubes of the industrial frequency bridge arm and the high frequency bridge arm of the switching power supply of this embodiment are both active tubes. The power factor correction on the AC side is achieved by adjusting the duty cycle of the high frequency bridge arm and the industrial frequency bridge arm; by adjusting the phase between the industrial frequency bridge arm and the high frequency bridge arm, the current ripple of the PFC inductor on the AC side is reduced, and the performance of the converter is improved; by controlling the frequency and other degrees of freedom of the high frequency bridge arm and the industrial frequency bridge arm, the subsequent stage gain can be adjusted and the output ripple can be stabilized; by multiplexing the high frequency bridge arm and the subsequent stage circuit, the cost can be reduced; and the switching power supply of this embodiment can also realize bidirectional power transmission.

[0084] The embodiments described above are merely examples of the technical solutions and contents of the present invention. It should be noted that the above embodiments should not be regarded as limiting the present invention. For those skilled in the art, several improvements and modifications can be made without departing from the spirit and scope of the present invention, but they will not deviate from the spirit of the present invention or exceed the scope defined by the attached claims, and should also be regarded as the protection scope of the present invention.

Claims

1. A control method for controlling a switch tube of a switching power supply, wherein the switching power supply comprises a PFC inductor, a power frequency bridge arm, a high frequency bridge arm, a bus capacitor and a post-stage circuit, wherein the power frequency bridge arm comprises a switch tube S1 and a switch tube S2, and the high frequency bridge arm comprises a switch tube S3 and a switch tube S4, wherein the switch tube S1 and the switch tube S3 are upper bridge arm switch tubes, and the switch tube S2 and the switch tube S4 are lower bridge arm switch tubes, characterized in that: The control method comprises: The driving pulses of the switch tube S1 and the switch tube S2 are complementary, and the duty cycle adjustment range is [0, 1]; The driving pulses of the switch tube S3 and the switch tube S4 are complementary, and the duty cycle adjustment range is [0, 1]; By adjusting the duty cycle D of the switch tube S1 S1 and the duty cycle D of the switch tube S3 S3 To achieve power factor correction on the AC side, the adjustment strategy is as follows: When the AC voltage source v ac When the instantaneous value is greater than or equal to 0, the driving pulse of the switch tube S3 lags behind the driving pulse of the switch tube S1, and the phase difference between the driving pulse of the switch tube S1 and the driving pulse of the switch tube S3 is θ1, and the adjustment range of θ1 is [0,180°]; When the AC voltage source v ac When the instantaneous value is less than 0, the driving pulse of the switch tube S3 is ahead of the driving pulse of the switch tube S1, and the phase difference between the driving pulse of the switch tube S1 and the driving pulse of the switch tube S3 is θ2, and the adjustment range of θ2 is [-180°, 0].

2. The control method according to claim 1, characterized in that: When the AC voltage source v ac When the instantaneous value is greater than or equal to zero, the on-time and off-time of the driving pulse of the switch tube S3 are both located between the on-time and off-time of the driving pulse of the switch tube S1; And when the AC voltage source v ac When the instantaneous value is less than zero, the turn-on time and turn-off time of the drive pulse of the switch tube S1 are both located between the turn-on time and turn-off time of the drive pulse of the switch tube S3.

3. The control method according to claim 2, characterized in that: The driving pulse of the switch tube S1 is centrally symmetrical with the driving pulse of the switch tube S3.

4. The control method according to claim 2, characterized in that: The driving pulse of the switch tube S1 is aligned with the turning-on time of the driving pulse of the switch tube S3.

5. The control method according to claim 2, characterized in that: The turn-off timings of the driving pulse of the switch tube S1 and the driving pulse of the switch tube S3 are aligned.

6. The control method according to claim 2, characterized in that: The switching frequency of the high-frequency bridge arm switch tube is consistent with the switching frequency of the industrial frequency bridge arm switch tube.

7. The control method according to claim 1, characterized in that: The on-time or off-time of the drive pulse of the switch tube S1 is between the on-time and off-time of the drive pulse of the switch tube S3, and the off-time or on-time of the drive pulse of the switch tube S1 is not between the on-time and off-time of the drive pulse of the switch tube S3.

8. The control method according to claim 1, characterized in that: When the AC voltage source v ac The instantaneous value is greater than or equal to zero and satisfies |v ac |≥V b When , the duty cycle of switch tube S1 is 1; When the AC voltage source v ac The instantaneous value is less than zero and satisfies |v ac |≥V b When , the duty cycle of switch tube S1 is 0; When the instantaneous value of the AC voltage source |v ac |∈[-V b ,V b ], the duty cycle D of the switch tube S1 S1 =|v ac / V m |; Among them, V b is the set voltage boundary, and V b ∈[0.35V bus ,0.65V bus ],V bus is the DC component of the bus capacitor voltage, V m is the AC voltage source v ac peak value.

9. A control device for controlling a switch tube of a switching power supply, wherein the switching power supply comprises an AC voltage source, a PFC inductor, an industrial frequency bridge arm, a high frequency bridge arm, a bus capacitor and a post-stage circuit, wherein the industrial frequency bridge arm comprises a switch tube S1 and a switch tube S2, and the high frequency bridge arm comprises a switch tube S3 and a switch tube S4, wherein the switch tube S1 and the switch tube S3 are upper bridge arm switch tubes, and the switch tube S2 and the switch tube S4 are lower bridge arm switch tubes, characterized in that: The control device comprises: A first driving pulse providing unit is configured to provide driving pulses for the switch tube S1 and the switch tube S2, wherein the driving pulses of the switch tube S1 and the switch tube S2 are complementary, and the duty cycle adjustment range is [0, 1]; A second driving pulse providing unit is configured to provide driving pulses for the switch tube S3 and the switch tube S4, the driving pulses of the switch tube S3 and the switch tube S4 are complementary, and the duty cycle adjustment range is [0, 1]; The power factor correction unit is configured to adjust the duty cycle D of the switch tube S1. S1 And the duty cycle D of switch tube S3 S3 To achieve power factor correction on the AC side, the adjustment strategy is as follows: When the AC voltage source v ac When the instantaneous value is greater than or equal to 0, the driving pulse of the switch tube S3 lags behind the driving pulse of the switch tube S1, and the phase difference between the driving pulse of the switch tube S1 and the driving pulse of the switch tube S3 is θ1, and the adjustment range of θ1 is [0,180°]; When the AC voltage source v ac When the instantaneous value is less than 0, the driving pulse of the switch tube S3 is ahead of the driving pulse of the switch tube S1, and the phase difference between the driving pulse of the switch tube S1 and the driving pulse of the switch tube S3 is θ2, and the adjustment range of θ2 is [-180°, 0].

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium includes a stored program, wherein the program executes the control method according to any one of claims 1 to 8 when executed.

11. A processor, characterized in that: The processor is used to run a program, wherein the program executes the control method described in any one of claims 1 to 8 when running.

12. A switching power supply, comprising a PFC inductor, a power frequency bridge arm, a high frequency bridge arm, a bus capacitor and a post-stage circuit, wherein the power frequency bridge arm comprises a switch tube S1 and a switch tube S2, the high frequency bridge arm comprises a switch tube S3 and a switch tube S4, the switch tube S1 and the switch tube S3 are upper bridge arm switch tubes, the switch tube S2 and the switch tube S4 are lower bridge arm switch tubes, characterized in that: The switching power supply further comprises the control device as claimed in claim 9.

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