Power supply circuit and converter control method

Abstract

The present application belongs to the technical field of electronics. Disclosed are a power supply circuit and a converter control method. The power supply circuit is connected to at least one driver, and the power supply circuit acquires a power supply voltage on the basis of the electric energy generated when a target input voltage jumps at a high frequency, and provides the power supply voltage to the at least one driver.

Description

Power supply circuit and converter control method

[0001] Cross-reference to related applications

[0002] This application is based on and claims priority to Chinese Patent Application No. 202410530770.0, filed on April 28, 2024, and Chinese Patent Application No. 2025100761852, filed on January 17, 2025, the entire contents of which are incorporated herein by reference. Technical Field

[0003] This application relates to the field of electronic technology, and more specifically, to a power supply circuit and a converter control method. Background Technology

[0004] In new energy photovoltaic, energy storage, and charging scenarios, high-efficiency power conversion circuits are required to convert the DC power from solar panels into AC power for grid connection, as well as to bidirectionally convert the DC power from energy storage batteries or vehicle power batteries into AC power from the grid. Among various power conversion circuit topologies, the isolated single-stage topology with an active full-bridge DC-side converter and a frequency converter on the AC-side features fewer circuit components, higher conversion efficiency, and input-output electrical isolation.

[0005] However, the power conversion circuit mentioned above requires an auxiliary power supply as the driving power for the AC-side frequency converter switching transistor. Providing an additional auxiliary isolated power supply from the DC solar panel or battery side will increase circuit cost, complexity, and electromagnetic interference (EMI).

[0006] In related technologies, isolated conversion circuits such as flyback converters are generally used to generate drive power. These circuits require a high-frequency transformer. The high-frequency transformer increases the size of the power conversion circuit and also brings electromagnetic compatibility (EMC) problems. Summary of the Invention

[0007] This application aims to at least solve one of the technical problems existing in the prior art. To this end, this application proposes a power supply circuit and a power conversion device, which obtains electrical energy when the input of the power supply circuit is respectively connected to the source of two sets of common-source switching elements, generates a supply voltage, and supplies power to the driver when the input voltage between the source of the two sets of common-source switching elements changes at high frequency. This reduces the number of components in the power supply circuit and the number of coupling points between it and the power circuit, solves the electromagnetic interference and electromagnetic compatibility problems caused by the need for auxiliary isolation power supplies in the prior art, and reduces the size of the power circuit.

[0008] In a first aspect, this application provides a power supply circuit, which is connected to at least one driver. The power supply circuit obtains a power supply voltage based on the electrical energy generated when a target input voltage undergoes a high-frequency jump, and provides it to at least one driver. The target input voltage is the input voltage between the sources of any two sets of switching elements in the power circuit. The power circuit includes at least two sets of switching elements, each set of switching elements being configured with a common source. At least one driver is connected to one set of switching elements for driving the set of switching elements.

[0009] According to the power supply circuit of this application, by connecting the power supply circuit input to the source of two sets of common-source switching elements respectively, electrical energy is obtained when the input voltage between the source of the two sets of common-source switching elements changes at high frequency, generating a power supply voltage to power the driver. This reduces the number of components in the power supply circuit and the number of coupling points between it and the power circuit, solves the electromagnetic interference and electromagnetic compatibility problems caused by the need to use auxiliary isolation power supplies in the prior art, and reduces the size of the power circuit.

[0010] According to one embodiment of this application, the power supply circuit includes: a power supply module and a control module;

[0011] The power supply module is connected to the source of any two sets of switching elements and is used to obtain the first output voltage based on the electrical energy generated when the target input voltage undergoes a high-frequency jump.

[0012] The control module is connected to the power supply module and is used to obtain the power supply voltage based on the first output voltage and provide it to the driver.

[0013] According to one embodiment of this application, the power supply module includes:

[0014] The system comprises a first capacitor, a second capacitor, a first diode, and a second diode; wherein one end of the first capacitor is connected to the source of a first set of switching elements, the first set of switching elements being one of any two sets of switching elements; the other end of the first capacitor is connected to the cathode of the first diode; the anode of the first diode is connected to one end of the second capacitor; the anode of the second diode is connected to the cathode of the first diode; the cathode of the second diode is connected to the other end of the second capacitor; the other end of the second capacitor is connected to the source of a second set of switching elements, the second set of switching elements being the other of any two sets of switching elements; and the two ends of the second capacitor are used to provide the first output voltage.

[0015] According to one embodiment of this application, the control module includes:

[0016] A first Zener diode, the two ends of which are respectively connected to the two ends of the second capacitor, is used to control the first output voltage provided by the two ends of the second capacitor.

[0017] According to one embodiment of this application, the control module further includes:

[0018] Linear adjustment circuit and third capacitor;

[0019] The linear adjustment circuit is connected to the second capacitor and the third capacitor respectively, and is used to control the second output voltage across the third capacitor according to the first output voltage input across the second capacitor, so as to obtain the power supply voltage and provide it to the driver.

[0020] According to one embodiment of this application, the linear adjustment circuit includes:

[0021] First resistor, second resistor, transistor, and second Zener diode;

[0022] One end of the first resistor is connected to one end of the second capacitor, and the other end of the first resistor is connected to the collector of the transistor. One end of the second resistor is connected to one end of the first resistor, and the other end of the second resistor is connected to the base of the transistor. The emitter of the transistor is connected to one end of the third capacitor. One end of the second Zener diode is connected to the base of the transistor, and the other end of the second Zener diode is connected to the other end of the second capacitor. The other end of the third capacitor is connected to the other end of the second Zener diode.

[0023] According to one embodiment of this application, the power supply module further includes:

[0024] Fourth capacitor, switching transistor, third diode, fifth capacitor;

[0025] One end of the fourth capacitor is connected to the source of the first set of switching elements, the other end of the fourth capacitor is connected to the anode of the third diode, the first end of the switching transistor is connected to the anode of the third diode, the cathode of the third diode is connected to one end of the fifth capacitor, the other end of the fifth capacitor is connected to the second end of the switching transistor, and the second end of the switching transistor is connected to the source of the second set of switching elements.

[0026] Accordingly, the control module also includes a comparator circuit;

[0027] The comparator circuit includes: a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a third Zener diode, and a comparator;

[0028] Wherein, one end of the third resistor is connected to one end of the fifth capacitor, the other end of the third resistor is connected to one end of the fourth resistor, the other end of the fourth resistor is connected to the other end of the fifth capacitor, one end of the fifth resistor is connected to one end of the third resistor, the other end of the fifth resistor is connected to one end of the third Zener diode, the other end of the third Zener diode is connected to the other end of the fifth capacitor, the first end of the comparator is connected to the other end of the third resistor, the second end of the comparator is connected to one end of the third Zener diode, the sixth resistor is connected to both the first and third ends of the comparator, and the third end of the comparator is connected to the third end of the switching transistor.

[0029] According to one embodiment of this application, when the third output voltage across the fifth capacitor is greater than or equal to the first voltage threshold, the comparator in the control module outputs a high level, the control module controls the switch to turn on, and the fifth capacitor is bypassed; when the third output voltage across the fifth capacitor is less than the second voltage threshold, the comparator in the control module outputs a low level, the control module controls the switch to turn off, and the fifth capacitor begins to charge.

[0030] Secondly, this application provides a power conversion device, which includes:

[0031] A power circuit for power conversion includes at least two sets of switching elements, each set of switching elements having a common source.

[0032] At least one driver, connected to a set of said switching elements, is used to drive the set of said switching elements;

[0033] At least one power supply circuit as described in any one of claims 1 to 8, the power supply circuit being connected to at least one driver, obtaining a power supply voltage based on the electrical energy generated when a target input voltage undergoes a high-frequency jump, and providing it to the driver, wherein the target input voltage is the input voltage between the sources of any two sets of switching elements in the power circuit.

[0034] According to one embodiment of this application, the power circuit is a frequency converter, the target input voltage is an AC pulse voltage, and the AC pulse voltage is generated by the high-frequency switching action of the switching elements on the primary side of the frequency converter and / or by the high-frequency switching action of the switching elements on the secondary side of the frequency converter.

[0035] According to the power conversion device of this application, by setting the power supply circuit input to be connected to the source of two sets of common-source switching elements respectively, electrical energy is obtained when the input voltage between the source of the two sets of common-source switching elements jumps at high frequency, generating a power supply voltage to power the driver. This reduces the number of components in the power supply circuit and the number of coupling points between it and the power circuit, solves the electromagnetic interference and electromagnetic compatibility problems caused by the need to use auxiliary isolation power supplies in the prior art, and reduces the size of the power circuit.

[0036] In addition, this application proposes a converter control method and circuit, and a converter circuit, by detecting the voltage signal between the common source and the common source, which can improve the accuracy of controlling the dead time of the AC-side converter, so as to accurately realize the zero-voltage turn-on of the switching transistor.

[0037] Thirdly, this application provides a converter control method, wherein the converter is a frequency converter disposed on the AC side of a conversion circuit; the converter includes a first switch, a second switch, a third switch, and a fourth switch; a first terminal of the first switch is connected to a first terminal of the second switch; a second terminal of the second switch is connected to a second terminal of the third switch; and a first terminal of the third switch is connected to a first terminal of the fourth switch; the method includes:

[0038] During the dead time, a first target voltage is obtained based on the sampling period; the first target voltage is the voltage between the first terminal of the first switch and the first terminal of the third switch.

[0039] If the first target voltage meets the target condition within the target time after the converter enters the dead zone state, the target switch in the converter is controlled to be turned on.

[0040] According to the converter control method of this application, by obtaining the voltage between the first terminal of the first switch and the first terminal of the third switch, and determining the zero-voltage turn-on time based on whether the voltage meets the target conditions, the zero-voltage turn-on time can be more accurately determined for the dead-time control of the AC side frequency converter through simple voltage detection, thereby achieving dynamic optimization of the dead-time and improving the overall conversion efficiency.

[0041] According to one embodiment of this application, the target condition includes: the absolute value of the difference between two consecutive first target voltages changes from being greater than a first threshold to being less than the first threshold.

[0042] According to one embodiment of this application, before controlling the target switch in the converter to turn on when the first target voltage meets the target condition, the method further includes:

[0043] During the dead time, a second target voltage is acquired; the second target voltage is the voltage between the second terminal of the first switch and the second terminal of the fourth switch.

[0044] The target conditions include: a change from the absolute value of the first target voltage being less than a second threshold to the absolute value of the difference between the first target voltage and the second target voltage being less than a third threshold; or a change from the absolute value of the difference between the first target voltage and the second target voltage being less than the third threshold to the absolute value of the first target voltage being less than the second threshold.

[0045] According to one embodiment of this application, the step of controlling the target switch in the converter to turn on when the first target voltage meets the target condition within a target duration after the converter enters the dead zone state includes:

[0046] The first target voltage acquired within the dead time is subjected to analog-to-digital conversion to obtain the target sequence;

[0047] Based on the target sequence, determine whether the absolute value of the difference between two adjacent first target voltages changes from being greater than the first threshold to being less than the first threshold.

[0048] If the converter enters the dead zone state for no more than the target duration, and the absolute value of the difference between two consecutive first target voltages changes from being greater than the first threshold to being less than the first threshold, the target switch is controlled to turn on.

[0049] According to one embodiment of this application, the step of controlling the target switch in the converter to turn on when the first target voltage meets the target condition within a target duration after the converter enters the dead zone state includes:

[0050] The first target voltage acquired within the dead time is subjected to analog-to-digital conversion to obtain a target sequence, and the second target voltage is subjected to analog-to-digital conversion as well.

[0051] Based on the target sequence and the second target voltage after analog-to-digital conversion, determine whether the first target voltage meets the target conditions;

[0052] If the converter enters the dead zone state for no more than the target duration and the first target voltage meets the target condition, the target switch is controlled to turn on.

[0053] According to one embodiment of this application, the step of controlling the target switch in the converter to turn on when the first target voltage meets the target condition within a target duration after the converter enters the dead zone state includes:

[0054] If the converter enters a dead zone state for no more than the target duration and receives a first interrupt signal or a second interrupt signal, the target switch is turned on. The first interrupt signal is triggered when the absolute value of the first target voltage drops below the second threshold. The second interrupt signal is triggered when the absolute value of the difference between the first target voltage and the second target voltage drops below the third threshold.

[0055] According to one embodiment of this application, after acquiring the first target voltage based on the sampling period within the dead time, the method further includes:

[0056] If, after a target duration following the converter entering a dead zone, the first target voltage does not meet the target conditions, the target switch is turned on.

[0057] Fourthly, this application provides a converter control device, wherein the converter is a frequency converter disposed on the AC side of a conversion circuit; the converter includes a first switch, a second switch, a third switch, and a fourth switch; a first terminal of the first switch is connected to a first terminal of the second switch; a second terminal of the second switch is connected to a second terminal of the third switch; and a first terminal of the third switch is connected to a first terminal of the fourth switch; the device includes:

[0058] The sampling module is used to acquire a first target voltage based on the sampling period during the dead time; the first target voltage is the voltage between the first terminal of the first switch and the first terminal of the third switch.

[0059] The control module is used to control the target switch in the converter to turn on during the target time after the converter enters the dead zone state, provided that the first target voltage meets the target conditions.

[0060] According to the converter control device of this application, by acquiring the voltage between the first terminal of the first switch and the first terminal of the third switch, and determining the zero-voltage turn-on time based on whether the voltage meets the target conditions, the zero-voltage turn-on time can be more accurately determined for the dead-time control of the AC side frequency converter through simple voltage detection, thereby achieving dynamic optimization of the dead-time and improving the overall conversion efficiency.

[0061] According to one embodiment of this application, the target condition includes: the absolute value of the difference between two consecutive first target voltages changes from being greater than a first threshold to being less than the first threshold.

[0062] According to one embodiment of this application, the sampling module is further configured to acquire a second target voltage during the dead time; the second target voltage is the voltage between the second terminal of the first switch and the second terminal of the fourth switch;

[0063] The target conditions include: a change from the absolute value of the first target voltage being less than a second threshold to the absolute value of the difference between the first target voltage and the second target voltage being less than a third threshold; or a change from the absolute value of the difference between the first target voltage and the second target voltage being less than the third threshold to the absolute value of the first target voltage being less than the second threshold.

[0064] According to one embodiment of this application, the sampling module includes:

[0065] A first sampling unit is configured to acquire the first target voltage based on the sampling period during the dead time.

[0066] The control module includes:

[0067] A first analog-to-digital converter is used to perform analog-to-digital conversion on the first target voltage acquired during the dead time to obtain a target sequence;

[0068] The control unit is configured to determine, based on the target sequence, whether the absolute value of the difference between two adjacent first target voltages changes from being greater than the first threshold to being less than the first threshold; and to control the target switch to turn on if the converter enters a dead zone state for no more than the target duration and the absolute value of the difference between two adjacent first target voltages changes from being greater than the first threshold to being less than the first threshold.

[0069] According to one embodiment of this application, the sampling module includes:

[0070] The second sampling unit is used to acquire the second target voltage during the dead time.

[0071] The control module includes:

[0072] A first analog-to-digital converter is used to perform analog-to-digital conversion on the first target voltage acquired during the dead time to obtain a target sequence.

[0073] A second analog-to-digital converter is used to perform analog-to-digital conversion on the second target voltage;

[0074] The control unit is configured to determine whether the first target voltage meets the target conditions based on the target sequence and the second target voltage after analog-to-digital conversion; and to control the target switch to turn on if the converter enters the dead zone state for no more than the target duration and the first target voltage meets the target conditions.

[0075] According to one embodiment of this application, the sampling module includes:

[0076] The second sampling unit is used to acquire the second target voltage during the dead time.

[0077] The control module includes:

[0078] A first comparator is used to compare the first target voltage and the second threshold; if the absolute value of the first target voltage is less than the second threshold, a first interrupt signal is triggered.

[0079] A second comparator is used to compare the first target voltage and the second target voltage; if the absolute value of the difference between the first target voltage and the second target voltage is less than the third threshold, a second interrupt signal is triggered.

[0080] The control unit is configured to control the target switch to turn on if the converter enters the dead zone state for no more than the target duration and a first interrupt signal or a second interrupt signal is received.

[0081] According to one embodiment of this application, the control module is further configured to control the target switch to turn on when the first target voltage does not meet the target condition after a target duration following the converter entering the dead zone state.

[0082] Fifthly, this application provides a conversion circuit, including: a frequency converter disposed on the AC side of the conversion circuit and a converter control device as described in the fourth aspect.

[0083] In a sixth aspect, this application provides an electronic device including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor, when executing the computer program, implements the converter control circuit as described in the fifth aspect above.

[0084] In a seventh aspect, this application provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the converter control circuit as described in the fifth aspect above.

[0085] Eighthly, this application provides a chip including a processor and a communication interface, the communication interface being coupled to the processor, the processor being used to run programs or instructions to implement the converter control circuit as described in the fifth aspect.

[0086] Ninthly, this application provides a computer program product, including a computer program that, when executed by a processor, implements the converter control circuit as described in the fifth aspect above.

[0087] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0088] Figure 1 is a schematic diagram of one of the power supply circuits provided in an embodiment of this application;

[0089] Figure 2 is a second schematic diagram of the power supply circuit provided in an embodiment of this application;

[0090] Figure 3 is one of the schematic diagrams of the working waveforms of the power supply circuit provided in the embodiment of this application;

[0091] Figure 4 is a third schematic diagram of the power supply circuit provided in the embodiment of this application;

[0092] Figure 5 is a structural schematic diagram of the power supply module provided in an embodiment of this application;

[0093] Figure 6 is a second schematic diagram of the working waveform of the power supply circuit provided in the embodiment of this application;

[0094] Figure 7 is a fourth schematic diagram of the power supply circuit provided in the embodiment of this application;

[0095] Figure 8 is a fifth schematic diagram of the power supply circuit provided in the embodiment of this application;

[0096] Figure 9 is a third schematic diagram of the working waveform of the power supply circuit provided in the embodiment of this application;

[0097] Figure 10 is one of the structural schematic diagrams of the cycle converter provided in the embodiment of this application;

[0098] Figure 11 is a second schematic diagram of the structure of the cycle converter provided in the embodiment of this application;

[0099] Figure 12 is a third schematic diagram of the structure of the cycle converter provided in the embodiment of this application;

[0100] Figure 13 is a schematic diagram of the power conversion device provided in an embodiment of this application;

[0101] Figure 14 is one of the flowcharts of the converter control method provided in the embodiments of this application;

[0102] Figure 15 is a fourth schematic diagram of the structure of the cycle converter provided in the embodiment of this application;

[0103] Figure 16 is the fifth schematic diagram of the cyclic converter provided in the embodiment of this application;

[0104] Figure 17 is a sixth schematic diagram of the structure of the cycle converter provided in the embodiment of this application;

[0105] Figure 18 is a waveform diagram of the first target voltage provided in an embodiment of this application;

[0106] Figure 19 is a schematic diagram of the zero-voltage turn-on time provided in the embodiment of this application;

[0107] Figure 20 is a second schematic flowchart of the converter control method provided in the embodiments of this application;

[0108] Figure 21 is a third schematic flowchart of the converter control method provided in the embodiments of this application;

[0109] Figure 22 is a fourth flowchart of the converter control method provided in the embodiments of this application;

[0110] Figure 23 is one of the structural schematic diagrams of the converter control device provided in the embodiment of this application;

[0111] Figure 24 is a second schematic diagram of the converter control device provided in an embodiment of this application;

[0112] Figure 25 is a third structural schematic diagram of the converter control device provided in the embodiment of this application;

[0113] Figure 26 is a fourth structural schematic diagram of the converter control device provided in an embodiment of this application;

[0114] Figure 27 is a schematic diagram of the conversion circuit provided in an embodiment of this application;

[0115] Figure 28 is a schematic diagram of the structure of the electronic device provided in an embodiment of this application.

[0116] Reference numerals: 110: driver; 120: power circuit; 1201: switching element; 130: power supply circuit; 1301: power supply module; 1302: control module; power conversion device: 200. Detailed Implementation

[0117] The technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application are within the scope of protection of this application.

[0118] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and the number of objects is not limited; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0119] This application provides a power supply circuit for an isolated converter circuit whose secondary side is a frequency converter.

[0120] For the 10-frequency converter structure, the power supply circuit input is connected to the source of two pairs of back-to-back power devices (such as two sets of common-source switching elements). When the input voltage jumps at high frequency, the power is obtained to power the driver, reducing the number of components in the secondary power supply circuit and the number of coupling points between it and the main power circuit.

[0121] In the application of half-bridge frequency converters, compared with the four sets of power supply circuits required in related technologies, this application only requires two sets of power supply circuits, reducing the number of components by half. Compared with related technologies that require high-frequency capacitors and have three coupling points between the power supply circuit and the power circuit, this application is applicable to circuits with and without high-frequency capacitors, and has only two coupling points between the power supply circuit and the power circuit, resulting in a wider range of applications and a simpler circuit design.

[0122] The power supply circuit and power conversion device provided in this application will be described in detail below with reference to the accompanying drawings, through specific embodiments and application scenarios.

[0123] As shown in Figure 1, the power supply circuit 130 is connected to at least one driver 110. The power supply circuit 130 obtains the power supply voltage based on the electrical energy generated when the target input voltage undergoes a high-frequency jump, and provides it to at least one driver 110. The target input voltage is the input voltage between the sources of any two sets of switching elements in the power circuit 120. The power circuit 120 includes at least two sets of switching elements, each set of switching elements 1201 is configured with a common source, and at least one driver 110 is connected to one set of switching elements 1201 to drive the set of switching elements 1201.

[0124] It is understood that the power supply circuit 130 is connected to one or more drivers 110. Simultaneously, the power supply circuit 130 is also connected to the sources of any two sets of common-source switching elements 1201 in the power circuit 120. Referring to Figure 1 and further to Figure 2, the power supply circuit 130 is connected to one driver 110 and the sources of any two sets of common-source switching elements 1201 in the power circuit 120. Specifically, it can generate a supply voltage based on the electrical energy generated when the input voltage (i.e., the target input voltage) between the sources of any two sets of common-source switching elements 1201 in the power circuit 120 undergoes a high-frequency transition, and supply this supply voltage to the driver 110 connected to it.

[0125] The driver 110 can be used to drive a group of switching elements 1201 connected thereto. The power circuit 120 includes at least two groups of switching elements with a common source configuration.

[0126] In one example, referring to Figure 2, the power supply circuit proposed in this embodiment is connected to the common source of two pairs of series back-to-back switching elements of the frequency converter, and its operating waveform is shown in Figure 3. The four switching elements of the frequency converter, such as switching transistors S1, S2, S3, and S4, operate alternately in high-frequency and low-frequency modes: in the positive half-wave of the grid voltage (u grid >0), S1 and S3 are complementary at high frequencies, while S2 and S4 are always on; during the negative half-wave of the grid voltage (u grid <0), S2 and S4 are complementary at high frequencies, while S1 and S3 are always on. Therefore, the voltage between the sources of the two sets of common-source switching transistors is a two-level pulse voltage waveform with a positive level and zero during the positive half-wave of the mains voltage; and a two-level pulse voltage waveform with a negative level and zero during the negative half-wave of the mains voltage. In some applications, the frequency converter implements soft switching, and the rising and falling edges between adjacent levels are determined by the corresponding soft-switching current and the equivalent output capacitance of the switching transistor. The power supply circuit 130 can obtain electrical energy from the above pulse voltage and convert it into the supply voltage required by the driver 110 connected to the switching transistors S1, S2, S3, and S4.

[0127] According to the power supply circuit provided in the embodiments of this application, by connecting the power supply circuit input to the source of two sets of common-source switching elements respectively, electrical energy is obtained when the input voltage between the source of the two sets of common-source switching elements jumps at high frequency, generating a power supply voltage to power the driver. This reduces the number of components in the power supply circuit and the number of coupling points between it and the power circuit, solves the electromagnetic interference and electromagnetic compatibility problems caused by the need to use auxiliary isolation power supplies in the prior art, and reduces the size of the power circuit.

[0128] In some embodiments, the power supply circuit 130 includes: a power supply module 1301 and a control module 1302;

[0129] The power supply module 1301 is connected to the source of any two sets of switching elements 1201 and is used to obtain the first output voltage based on the electrical energy generated when the target input voltage undergoes a high-frequency jump.

[0130] The control module 1302 is connected to the power supply module 1302 and is used to obtain the power supply voltage according to the first output voltage and provide it to the driver 110.

[0131] Referring to Figure 4, the power supply circuit 130 may specifically include a power supply module 1301 and a control module 1302.

[0132] The power supply module 1301 is connected to the source of any two sets of common-source switching elements 1201 in the power circuit 120. Specifically, it can be used to generate an output voltage, i.e., the first output voltage, based on the electrical energy generated when the input voltage between the sources of any two sets of common-source switching elements 1201 in the power circuit 120 undergoes a high-frequency jump.

[0133] The control module 1302 is connected to the power supply module 1301, and it can be used to control the first output voltage output by the power supply module 1301 to obtain the power supply voltage provided to the driver 110.

[0134] In some embodiments, the power supply module 1301 may include:

[0135] The system comprises a first capacitor, a second capacitor, a first diode, and a second diode; wherein one end of the first capacitor is connected to the source of a first set of switching elements, the first set of switching elements being one of any two sets of switching elements; the other end of the first capacitor is connected to the cathode of the first diode; the anode of the first diode is connected to one end of the second capacitor; the anode of the second diode is connected to the cathode of the first diode; the cathode of the second diode is connected to the other end of the second capacitor; the other end of the second capacitor is connected to the source of a second set of switching elements, the second set of switching elements being the other of any two sets of switching elements; and the two ends of the second capacitor are used to provide the first output voltage.

[0136] Referring to Figure 5, the power supply module 1201 can consist of two capacitors (namely, the first capacitor C). s Second capacitor C o It consists of a diode and two diodes (the first diode D1 and the second diode D2, respectively).

[0137] Among them, the first capacitor C s One end is connected to the source of one of the two sets of common-source switching elements 1201 (i.e., the first set of switching elements 1201) in the power circuit 120. The first capacitor Cs The other end is connected to the negative terminal of the first diode D1, and the positive terminal of the first diode D1 is connected to the second capacitor C. o One end of the diode is connected, the positive terminal of the second diode D2 is connected to the negative terminal of the first diode D1, and the negative terminal of the second diode D2 is connected to the second capacitor C. o The other end of the connection, the second capacitor C o The other end is connected to the source of another set of switching elements (i.e., the second set of switching elements) in any two sets of common-source switching elements in the power circuit 120. The second capacitor C o The two ends are used to provide the aforementioned first output voltage.

[0138] In some embodiments, the control module 1302 may include:

[0139] A first Zener diode, the two ends of which are respectively connected to the two ends of the second capacitor, is used to control the first output voltage provided by the two ends of the second capacitor.

[0140] Referring to Figure 5, the control module 1302 may include a first Zener diode Z1, the two ends of which are respectively connected to the aforementioned second capacitor C. o The two ends are connected, which can be specifically used to stabilize the second capacitor C. o The first output voltage provided at both ends becomes the power supply voltage provided to the driver 110.

[0141] Please refer to Figure 6 further, for the voltage u between the two common-source terminals during the positive half-wave of the mains voltage. aux_in When the voltage rises from zero to high, the current flows through C. s D2 to C o Charging; the voltage u between the sources of two common-source switching elements. aux_in When the voltage drops from high to zero, current flows through D1 to C. s Discharge. C o The first output voltage u at both ends o The voltage gradually increases and is stabilized at the required voltage by the first Zener diode Z1 before supplying power to the driver 110. During the negative half-wave of the mains voltage, the voltage u between the sources of the two common-source switching elements... aux_in When the voltage drops from zero to negative, current flows through D1 to C. s Charging; the voltage u between the sources of two common-source switching elements. aux_in As the voltage rises from a negative level to a zero level, the current flows through C. s D2 to C o Charging. C o The first output voltage u at both ends o The voltage gradually increases and is stabilized at the required voltage by the first Zener diode Z1 before supplying power to the driver 110.

[0142] In some embodiments, the control module 1302 may further include:

[0143] Linear adjustment circuit and third capacitor;

[0144] The linear adjustment circuit is connected to the second capacitor and the third capacitor respectively, and is used to control the second output voltage across the third capacitor according to the first output voltage input across the second capacitor, so as to obtain the power supply voltage and provide it to the driver.

[0145] Optionally, the control module 1302 may further include a linear adjustment circuit and a third capacitor, the linear adjustment circuit being connected to the second capacitor C. o It is connected to the third capacitor, which can be specifically used according to the second capacitor C. o The first output voltage input at both ends controls the second output voltage across the third capacitor, thus obtaining the power supply voltage for the driver 110. A linear regulation circuit replaces the aforementioned first Zener diode Z1 as the control module 1302 to regulate the output voltage.

[0146] In some embodiments, the linear adjustment circuit may include:

[0147] First resistor, second resistor, transistor, and second Zener diode;

[0148] One end of the first resistor is connected to one end of the second capacitor, and the other end of the first resistor is connected to the collector of the transistor. One end of the second resistor is connected to one end of the first resistor, and the other end of the second resistor is connected to the base of the transistor. The emitter of the transistor is connected to one end of the third capacitor. One end of the second Zener diode is connected to the base of the transistor, and the other end of the second Zener diode is connected to the other end of the second capacitor. The other end of the third capacitor is connected to the other end of the second Zener diode.

[0149] Referring to Figure 7, the linear adjustment circuit may specifically include a first resistor R1, a second resistor R2, a transistor VT1, and a second Zener diode Z2. The second Zener diode may be the same as or different from the first Zener diode.

[0150] One end of the first resistor R1 is connected to the second capacitor C. o One end of the first resistor R1 is connected to the first resistor R1, and the other end of the first resistor R1 is connected to the collector of the transistor VT1. One end of the second resistor R2 is connected to one end of the first resistor R1, and the other end of the second resistor R2 is connected to the base of the transistor VT1. The emitter of the transistor VT1 is connected to the third capacitor C. o2One end of the first transistor is connected to the base of the second Zener diode Z2, and the other end of the second Zener diode Z2 is connected to the base of the second capacitor C. o The other end is connected to the third capacitor C. o2 The other end is connected to the other end of the second Zener diode Z2.

[0151] Where C S D1, D2, C O1 Its operating mode and waveform are the same as those of power supply module 1301. Additionally, current flows through the second resistor R2 and the second Zener diode Z2 to establish a reference voltage U at the base of transistor VT1. Z1 When the output voltage u O2 When the voltage is too high, the voltage difference between the base and emitter of transistor VT1 decreases, leading to an increase in the transistor's equivalent on-resistance, which causes u to... O2 Decrease; when the output voltage u O2 When the voltage is too low, the voltage difference between the base and emitter of transistor VT1 increases, leading to a decrease in the transistor's equivalent on-resistance, which in turn causes u to... O2 The voltage rises. This ultimately causes the output voltage u to... O2 Stabilize at the required voltage and power driver 110.

[0152] In some embodiments, the power supply module 1301 may further include:

[0153] Fourth capacitor, switching transistor, third diode, fifth capacitor;

[0154] One end of the fourth capacitor is connected to the source of the first set of switching elements, the other end of the fourth capacitor is connected to the anode of the third diode, the first end of the switching transistor is connected to the anode of the third diode, the cathode of the third diode is connected to one end of the fifth capacitor, the other end of the fifth capacitor is connected to the second end of the switching transistor, and the second end of the switching transistor is connected to the source of the second set of switching elements.

[0155] Accordingly, the control module 1302 may also include a comparator circuit;

[0156] The comparator circuit includes: a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a third Zener diode, and a comparator;

[0157] Wherein, one end of the third resistor is connected to one end of the fifth capacitor, the other end of the third resistor is connected to one end of the fourth resistor, the other end of the fourth resistor is connected to the other end of the fifth capacitor, one end of the fifth resistor is connected to one end of the third resistor, the other end of the fifth resistor is connected to one end of the third Zener diode, the other end of the third Zener diode is connected to the other end of the fifth capacitor, the first end of the comparator is connected to the other end of the third resistor, the second end of the comparator is connected to one end of the third Zener diode, the sixth resistor is connected to both the first and third ends of the comparator, and the third end of the comparator is connected to the third end of the switching transistor.

[0158] Referring to Figure 8, the power supply module 1301 may further include a fourth capacitor C. s1 Switch Q1, third diode D3, fifth capacitor C o3 Among them, the fourth capacitor C s1 One end of the capacitor C is connected to the source of one of the two sets of switching elements with a common source (i.e., the first set of switching elements). s1 The other end is connected to the positive terminal of the third diode D3, the first terminal of the switching transistor Q1 is connected to the positive terminal of the third diode D3, and the negative terminal of the third diode D3 is connected to the fifth capacitor C. o3 One end is connected to the fifth capacitor C. o3 The other end is connected to the second end of the switching transistor Q1, and the second end of the switching transistor Q1 is connected to the source of another set of switching elements (i.e., the second set of switching elements) of any two sets of common source switching elements.

[0159] The control module 1302 may further include a comparator circuit. This comparator circuit may specifically include: a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a third Zener diode Z3, and a comparator Comp1.

[0160] One end of the third resistor R3 is connected to the fifth capacitor C. o3 One end of the third resistor R3 is connected to the fourth resistor R4, and the other end of the fourth resistor R4 is connected to the fifth capacitor C. o3 The other end is connected, one end of the fifth resistor R5 is connected to one end of the third resistor R3, the other end of the fifth resistor R5 is connected to one end of the third Zener diode Z3, and the other end of the third Zener diode Z3 is connected to the fifth capacitor C. o3The other end is connected, the first end of comparator Comp1 is connected to the other end of the third resistor R3, the second end of comparator Comp1 is connected to one end of the third Zener diode Z3, the sixth resistor R6 is connected to the first end and the third end of comparator Comp1 respectively, and the third end of comparator Comp1 is connected to the third end of the switching transistor Q1.

[0161] In some embodiments, when the third output voltage across the fifth capacitor is greater than or equal to the first voltage threshold, the comparator in the control module outputs a high level, the control module controls the switch to turn on, and the fifth capacitor is bypassed; when the third output voltage across the fifth capacitor is less than the second voltage threshold, the comparator in the control module outputs a low level, the control module controls the switch to turn off, and the fifth capacitor begins to charge.

[0162] Referring to Figure 8, and further referring to Figure 9, a comparator circuit replaces the first Zener diode to achieve voltage regulation of the output voltage. The specific operating waveform is shown in Figure 9. When Q1 is off, C... S1 The charging and discharging circuits are the same as those of the power supply module 1301 mentioned above, C O3 Voltage u O3 The value continuously increases. R3, R4, R5, R6, Z3, and Comp1 constitute a hysteresis comparator circuit. When C... O3 Voltage u at both ends O3 Greater than or equal to the first voltage threshold U thres1 At time t1 in Figure 9, comparator Comp1 outputs a high level, Q1 is turned on, and D3 is bypassed to C. O3 The charging current makes u O3 Stop rising; when C O3 Voltage u at both ends O3 The voltage drops below the second voltage threshold U thres2 At time t2 in Figure 9, comparator Comp1 outputs a low level, Q1 is turned off, and C... O3 It can continue at the input voltage u aux_in The rising edge of the interval is charged, u O3 Rise. Final output voltage u O3 It is stabilized at the required voltage and supplies power to driver 110.

[0163] in, R3 represents the voltage of the third Zener diode Z3, R4 represents the resistance of the third resistor, R6 represents the resistance of the fourth resistor, and R6 represents the resistance of the sixth resistor.

[0164] It should be noted that the power supply circuit provided in this application embodiment can also be applied to the transformer secondary frequency converter structure shown in Figures 10-12.

[0165] The power supply circuit provided in the embodiments of this application saves the high-frequency transformer compared with the traditional isolated power supply scheme, which is beneficial to the reduction of power circuit size and the improvement of EMI characteristics.

[0166] This application also provides a power conversion device.

[0167] Referring to Figure 13, the power conversion device 200 includes:

[0168] The power circuit 120 is used for power conversion and includes at least two sets of switching elements 1201, each set of switching elements 1201 being configured with a common source.

[0169] At least one driver 110 is connected to a set of the switching elements 1201 for driving the set of the switching elements 1201;

[0170] At least one power supply circuit 130 as described above is connected to at least one driver 110. The power supply circuit 130 obtains the power supply voltage based on the electrical energy generated when the target input voltage undergoes a high-frequency jump and provides it to the driver 110. The target input voltage is the input voltage between the sources of any two sets of switching elements 1201 in the power circuit.

[0171] In some embodiments, the power circuit is a frequency converter, the target input voltage is an AC pulse voltage, and the AC pulse voltage is generated by the high-frequency switching action of the switching elements on the primary side of the frequency converter and / or by the high-frequency switching action of the switching elements on the secondary side of the frequency converter.

[0172] Optionally, the power circuit 120 is a frequency converter as shown in Figure 2, Figures 10-12. The input voltage (i.e., the target input voltage) between the sources of any two sets of common-source switching elements in the power circuit is an AC pulse voltage. During initial startup, the input voltage between the sources of any two sets of common-source switching elements can be generated by the high-frequency switching action of the primary-side switching element. During operation, it can be generated by the high-frequency switching action of the primary-side switching element and / or the secondary-side switching element.

[0173] According to the power conversion device provided in the embodiments of this application, by setting the power supply circuit input to be connected to the source of two sets of common source switching elements respectively, the power supply voltage is generated when the input voltage between the source of the two sets of common source switching elements jumps at high frequency, and the power supply voltage is used to power the driver. This reduces the number of components in the power supply circuit and the number of coupling points between it and the power circuit, solves the electromagnetic interference and electromagnetic compatibility problems caused by the need to use auxiliary isolation power supply in the prior art, and reduces the size of the power circuit.

[0174] In related technologies, for the switching transistors in AC-side converters, since the voltage they withstand when turned off is the grid voltage, and the amplitude of the grid voltage changes with the power frequency cycle, the amount of charge that the equivalent output capacitor of the switching transistor needs to charge or discharge within the dead zone of the aforementioned switching transistor is not a constant value, which makes the zero-voltage turn-on design of the aforementioned switching transistor difficult.

[0175] The fixed dead-time design sets the dead time of the switching transistors in the AC-side converter to a large fixed value. However, this method results in excessively long dead times at many operating points, increasing the conduction losses of the parasitic anti-parallel diodes of the aforementioned switching transistors and leading to a decrease in the overall conversion efficiency.

[0176] Integrating the inductor current over the dead time can only indirectly determine the zero-voltage turn-on time. Since the capacitance of the parasitic output capacitor of the aforementioned switching transistor varies greatly with the voltage across it, there is a significant error.

[0177] In summary, the control of the dead time of the AC-side converter in related technologies has shortcomings such as large errors and poor accuracy.

[0178] The converter control method and circuit, and the converter circuit provided in this application will be described in detail below with reference to the accompanying drawings and through specific embodiments and application scenarios.

[0179] The converter control method can be applied to the terminal, and can be executed by the hardware or software in the terminal.

[0180] The terminal includes, but is not limited to, portable communication devices such as mobile phones or tablets with touch-sensitive surfaces (e.g., touchscreen displays and / or touchpads). It should also be understood that, in some embodiments, the terminal may not be a portable communication device, but rather a desktop computer with touch-sensitive surfaces (e.g., touchscreen displays and / or touchpads).

[0181] The following embodiments describe a terminal including a display and a touch-sensitive surface. However, it should be understood that the terminal may include one or more other physical user interface devices such as a physical keyboard, mouse, and joystick.

[0182] The converter control method provided in this application embodiment can be executed by an electronic device or a functional module or entity in an electronic device that can implement the converter control method. The electronic devices mentioned in this application embodiment include, but are not limited to, mobile phones, tablets, computers, cameras, and wearable devices. The converter control method provided in this application embodiment is described below using an electronic device as the execution subject.

[0183] In the aforementioned power supply circuit, the switching voltage between the common source terminals can be used as an auxiliary power source, eliminating the need for an additional auxiliary isolation power supply. This solves the electromagnetic interference and electromagnetic compatibility problems caused by the need for an auxiliary isolation power supply, and reduces the size of the power circuit. In this embodiment, to address the issues of large errors and poor accuracy in controlling the dead time of the AC-side converter in related technologies, the voltage between the common source terminals is also utilized. This voltage is used as the basis for determining the zero-voltage turn-on time. By detecting the voltage signal between the common source terminals, the zero-voltage turn-on time can be determined promptly and accurately, improving the accuracy of controlling the dead time of the AC-side converter and precisely achieving zero-voltage turn-on of the switching transistor.

[0184] As shown in Figure 14, the converter control method includes steps 1710 and 1720.

[0185] In practical application, this converter control method is applicable to controlling a frequency converter located on the AC side of the conversion circuit.

[0186] The converter 2000 is a frequency converter located on the AC side of the conversion circuit; the converter 2000 includes a first switch S1, a second switch S2, a third switch S3 and a fourth switch S4; the first terminal of the first switch S1 is connected to the first terminal of the second switch S2; the second terminal of the second switch S2 is connected to the second terminal of the third switch S3; and the first terminal of the third switch S3 is connected to the first terminal of the fourth switch S4.

[0187] In actual implementation, the frequency converter on the AC side can be a half-bridge frequency converter. Figures 15 to 17 show three topologies of the half-bridge frequency converter. Referring to Figures 15 to 17, the converter 2000 includes four switching transistors (i.e., the first switching transistor S1, the second switching transistor S2, the third switching transistor S3, and the fourth switching transistor S4). The connection relationships between the four switching transistors are also the same, the difference being the connection relationship with the transformer. Referring to Figure 15, the second terminal of the first switching transistor S1 and the second terminal of the fourth switching transistor S4 are connected in series by a capacitor C. r1 and C r2 The transformer is connected to the second terminal of the second switch S2 and the capacitor C, respectively. r1 With C r2 The connection point. Referring to Figure 16, the second terminal of the first switch S1 and the second terminal of the fourth switch S4 are connected by a capacitor. The transformer is connected to the second terminals of the second switch S2 and the fourth switch S4 respectively, and the transformer is connected to the capacitor C. rConnect the second terminal of the second switch S2. Referring to Figure 17, the second terminal of the first switch S1 and the second terminal of the fourth switch S4 are connected via a capacitor. The transformer is connected to the first terminal of the second switch S2 and the first terminal of the third switch S3 (i.e., the two common-source terminals), and the transformer is connected via capacitor C. r Connect the first terminal of the second switching transistor S2.

[0188] In some embodiments, the first switch S1, the second switch S2, the third switch S3, and the fourth switch S4 can be switch transistors of the same type, such as MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor) or IGBT (Insulated-Gate Bipolar Transistor).

[0189] The first end of the first switch S1 can be connected to the first end of the second switch S2, the second end of the second switch S2 can be connected to the second end of the third switch S3, and the first end of the third switch S3 can be connected to the first end of the fourth switch S4, thus forming a structure in which four switches are connected in series.

[0190] This application does not limit which electrode the first and second terminals of the four switching transistors are specifically designated as. For example, when all four switching transistors are MOSFETs, the first terminal can be the source, the second terminal can be the drain, and the third terminal can be the gate; when all four switching transistors are IGBTs, the first terminal can be the collector, the second terminal can be the emitter, and the third terminal can be the gate.

[0191] It is understandable that, for the structures shown in Figures 15 to 17, during the positive half-cycle of the grid voltage, low-frequency switches S2 and S4 remain on, while high-frequency switches S1 and S3 conduct complementary high-frequency signals; during the negative half-cycle of the grid voltage, low-frequency switches S1 and S3 remain on, while high-frequency switches S2 and S4 conduct complementary high-frequency signals. The voltage u between the sources of S1 and S2 and the sources of S3 and S4 is... S-S The waveform can be shown in Figure 18.

[0192] Step 1710: During the dead time, obtain the first target voltage based on the sampling period; the first target voltage is the voltage u between the first terminal of the first switch S1 and the first terminal of the third switch S3. S-S .

[0193] In actual execution, during the dead time of converter 2000, the voltage u between the first terminal of the first switch S1 and the first terminal of the third switch S3 can be sampled based on a preset sampling period. S-S Sampling is performed to obtain the first target voltage u. S-S The specific duration of the sampling period is not limited in the embodiments of this application.

[0194] Obtain the voltage u between the first terminal of the first switch S1 and the first terminal of the third switch S3. S-S Any voltage sampling or other method for acquiring voltage can be used from related technologies. This application does not limit the specific method used.

[0195] It is understandable that, for the circuit structure shown in Figures 15 to 17, the first terminal (specifically, the source) of the first switch S1 is connected to the first terminal of the second switch S2, and the first terminal (specifically, the source) of the third switch S3 is connected to the first terminal of the fourth switch S4. That is, the first switch S1 and the second switch S2 share a common source, and the third switch S3 and the fourth switch S4 share a common source. The first target voltage is the voltage between the two common sources, and therefore the first target voltage can also be called the common source voltage.

[0196] Step 1720: Within the target time after the converter 2000 enters the dead zone state, if the first target voltage meets the target conditions, control the target switch in the converter to turn on.

[0197] In actual execution, the first target voltage u can be determined. S-S Whether the target conditions are met determines whether the zero-voltage turn-on (ZVS on) time of the switching transistor has been reached. If the converter 2000 enters the dead-time state before exceeding the target duration, the first target voltage u... S-S Meeting the target conditions means reaching the zero-voltage turn-on time of the switching transistor; if the converter 2000 enters the dead-time state before exceeding the target duration, the first target voltage u S-S If the target conditions are not met, it means that the zero-voltage turn-on time of the switching transistor has not been reached.

[0198] After obtaining the first target voltage, the first target voltage u can be determined. S-S Does it meet the target conditions? If the converter 2000 enters the dead zone state within the target duration, the first target voltage u... S-S Meeting the target conditions means that the conditions for zero-voltage turn-on of the switching transistor are met, and the target switching transistor in the converter can be turned on.

[0199] It is understandable that during the positive half-cycle of the grid voltage, the target switching transistors include the first switching transistor S1 and the third switching transistor S3; during the negative half-cycle of the grid voltage, the target switching transistors include the second switching transistor S2 and the fourth switching transistor S4.

[0200] The target duration can be preset according to actual conditions. This application does not limit the specific value of the target duration in its embodiments.

[0201] It should be noted that the embodiments of this application, through u S-S The sampling is used to determine the moment of zero-voltage switching (ZVS) of the switching transistor, thereby dynamically controlling the dead time. As shown in Figure 19, for the circuit structures shown in Figures 15 to 17, during the dead time, the inductor current freewheels, causing the output of the high-frequency complementary switching transistor to charge and discharge between capacitors. With a suitable switching transistor control method, sufficient freewheeling current can be achieved to fully charge and discharge the output capacitors. The voltage across the newly turned-off switching transistor rises to the grid voltage, while the voltage across the turned-on switching transistor drops to near zero. After this, the voltage across the switching transistor is clamped at the grid voltage and zero, thus satisfying the zero-voltage switching condition. Therefore, by only sampling u... S-S By detecting and judging the voltage characteristics, the zero-voltage turn-on time t of each switching transistor can be captured. p1 &t p3 &t p5 , t n1 &t n3 &t n5 (As shown in the dashed circle in Figure 19), dynamic dead-time control of the four switching transistors of the frequency converter can be achieved through relatively simple detection, reducing the conduction of parasitic anti-parallel diodes and thus improving the overall efficiency.

[0202] According to the converter control method provided in the embodiments of this application, by obtaining the voltage between the first terminal of the first switch and the first terminal of the third switch, and determining the zero-voltage turn-on time based on whether the voltage meets the target conditions, the zero-voltage turn-on time can be more accurately determined for the dead-time control of the AC side frequency converter through simple voltage detection, thereby achieving dynamic optimization of the dead-time and improving the overall conversion efficiency.

[0203] In some embodiments, the target condition includes: the absolute value of the difference between two adjacent first target voltages changes from being greater than a first threshold to being less than a first threshold.

[0204] In actual execution, determining whether the first target voltage meets the target conditions can include judging whether the absolute value of the difference between two consecutive first target voltages changes from being greater than a first threshold to being less than a first threshold. That is, judging whether the absolute value of the difference between the (n-1)th obtained first target voltage and the (n-2)th obtained first target voltage is greater than the first threshold, and whether the absolute value of the difference between the nth obtained first target voltage and the (n-1)th obtained first target voltage is less than the first threshold; where n is a positive integer.

[0205] If the first target voltage u is obtained in two consecutive adjacent measurements S-S When the absolute value of the difference changes from being greater than the first threshold to being less than the first threshold, then the first target voltage u... S-S If the target conditions are met, a zero-voltage turn-on moment is detected; for other cases, the first target voltage u... S-S The target conditions are not met; a zero-voltage turn-on time was detected.

[0206] The first threshold is a relatively small value. The first threshold can be predetermined based on actual circumstances. This application does not limit the specific value of the first threshold.

[0207] According to the converter control method provided in the embodiments of this application, the zero-voltage turn-on time is determined by judging whether the absolute value of the difference between two adjacent first target voltages changes from greater than a first threshold to less than a first threshold. For the dead-time control of the AC side frequency converter, the zero-voltage turn-on time can be determined more accurately through simple voltage detection, thereby achieving dynamic optimization of the dead-time and improving the overall conversion efficiency.

[0208] In some embodiments, before turning on the target switch in the converter when the first target voltage meets the target condition, the method further includes: acquiring a second target voltage during the dead time; the second target voltage is the voltage between the second terminal of the first switch and the second terminal of the fourth switch.

[0209] In actual operation, during the dead time of converter 2000, the voltage between the second terminal of the first switch S1 and the second terminal of the fourth switch S4 can be obtained, thus yielding the second target voltage. Since the second terminals of the first switch S1 and the fourth switch S4 form the two ends of a bridge arm composed of the first switch S1, the second switch S2, the third switch S3, and the fourth switch S4, and are respectively connected to the power grid, the second target voltage is the voltage across the bridge arm, which can be denoted as u. grid .

[0210] The target conditions include: a change from the absolute value of the first target voltage being less than the second threshold to the absolute value of the difference between the first target voltage and the second target voltage being less than the third threshold; or a change from the absolute value of the difference between the first target voltage and the second target voltage being less than the third threshold to the absolute value of the first target voltage being less than the second threshold.

[0211] In actual execution, determining whether the first target voltage meets the target condition can include: determining whether the voltage is from the first target voltage u S-S The absolute value is less than the second threshold and changes to the first target voltage u S-S With the second target voltage u grid The absolute value of the difference is less than the third threshold, and whether it is from the first target voltage u S-S With the second target voltage u grid The absolute value of the difference is less than the third threshold change to the first target voltage u S-S The absolute value is less than the second threshold.

[0212] Under the condition that the above two conditions are met, the first target voltage is u S-S If the target conditions are met, but if neither of the above two conditions are met, the first target voltage u S-S The target condition is not met. That is, the first target voltage u... S-S From its absolute value being less than the second threshold to changing with the second target voltage u grid The absolute value of the difference is less than the third threshold, or from the first target voltage u S-S With the second target voltage u grid The absolute value of the difference is less than the third threshold change to the first target voltage u S-S The absolute value is less than the second threshold, and both are the first target voltage. S-S The target conditions are met. The first target voltage u S-S It did not change from its absolute value being less than the second threshold to being related to the second target voltage u. grid The absolute value of the difference is less than the third threshold, and it is not from the first target voltage u. S-S With the second target voltage u grid The absolute value of the difference is less than the third threshold change to the first target voltage u S-S The absolute value is less than the second threshold, and the first target voltage is u. S-S It does not meet the target conditions.

[0213] Both the second and third thresholds are relatively small values. The second and third thresholds can be predetermined based on actual circumstances. This application does not limit the specific values ​​of the second and third thresholds.

[0214] According to the converter control method provided in the embodiments of this application, the zero-voltage turn-on time is determined by judging whether the absolute value of the first target voltage changes from being less than the second threshold to the absolute value of the difference between the first target voltage and the second target voltage being less than the third threshold, and whether the absolute value of the difference between the first target voltage and the second target voltage changes from being less than the third threshold to the absolute value of the first target voltage being less than the second threshold. For the dead-time control of the AC side frequency converter, the zero-voltage turn-on time can be determined more accurately through simple voltage detection, thereby achieving dynamic optimization of the dead-time and improving the overall conversion efficiency.

[0215] In some embodiments, if the first target voltage meets the target condition within the target time after the converter enters the dead zone state, controlling the target switch in the converter to turn on includes: performing analog-to-digital conversion on the first target voltage obtained within the dead time to obtain the target sequence.

[0216] In actual execution, the first target voltage u is acquired each time. S-S Then, the first target voltage u can be... S-S An analog-to-digital (ADC) conversion is performed to obtain the target sequence. This can be understood as the target sequence being derived from the first target voltage u obtained at different sampling times. S-S Arranged according to sampling time.

[0217] Based on the target sequence, determine whether the absolute value of the difference between two adjacent first target voltages changes from being greater than a first threshold to being less than a first threshold.

[0218] In actual execution, after each update of the target sequence (i.e., after adding a new data point to the target sequence), the first target voltage u obtained in this iteration can be calculated. S-S The ADC conversion result is compared with the first target voltage u obtained previously. S-S The absolute value of the difference between the ADC conversion results.

[0219] If the converter enters the dead zone state for no more than the target duration, and the absolute value of the difference between two adjacent first target voltages changes from being greater than the first threshold to being less than the first threshold, the target switch is turned on.

[0220] In actual execution, if the converter 2000 enters the dead zone state within the target duration, the first target voltage u can be determined by combining the absolute value of the aforementioned difference obtained this time with the absolute value of the aforementioned difference obtained last time. S-S Does it meet the target conditions?

[0221] In some embodiments, if the absolute value of the previously obtained difference is greater than a first threshold and the absolute value of the currently obtained difference is less than the first threshold, the first target voltage u can be determined. S-S If the target conditions are met, a zero-voltage turn-on moment is detected; for other cases, the first target voltage u... S-S The target conditions were not met; no zero-voltage turn-on moment was detected.

[0222] It's important to note that the purpose of analog-to-digital conversion is to convert analog signals into digital signals by the microcontroller. This makes it easier to process and perform logical judgments on the digital signals, and also facilitates the determination of the difference between two adjacent sample values. Analog signals are less flexible than digital signals in determining voltage change trends, requiring additional analog circuitry. However, the first target voltage u can be flexibly determined through code. S-S Does the climbing speed in the dead zone change from steep to flat?

[0223] The above process can be illustrated in Figure 20. Referring to Figure 20, a converter control method may include the following steps.

[0224] Step 710: Measure the voltage u between the common source and common source terminals of the frequency converter. S-S Perform sampling.

[0225] Step 720: Within the dead zone of the frequency converter, measure the voltage u between the common source and the common source. S-S Perform ADC conversion.

[0226] Step 730: Determine whether the absolute value of the difference between adjacent ADC conversion results changes from being greater than the first threshold to being less than the first threshold.

[0227] If yes, proceed to step 740; otherwise, return to step 720 and repeat.

[0228] Step 740: When zero voltage turn-on is detected, turn on the target switch.

[0229] According to the converter control method provided in the embodiments of this application, the target voltage obtained during the dead time is converted from analog to digital to obtain a target sequence. Based on the target sequence, it is determined whether the absolute value of the difference between two adjacent first target voltages changes from greater than a first threshold to less than a first threshold, and the zero-voltage turn-on time is determined. For the dead time control of the AC side frequency converter, the zero-voltage turn-on time can be determined more accurately through simple voltage detection, thereby achieving dynamic optimization of the dead time and improving the overall conversion efficiency.

[0230] In some embodiments, if the first target voltage meets the target condition within the target duration after the converter enters the dead zone state, the target switch in the converter is turned on, including: performing analog-to-digital conversion on the first target voltage obtained within the dead zone time, obtaining the target sequence, and performing analog-to-digital conversion on the second target voltage.

[0231] In actual execution, the first target voltage u is acquired each time. S-S Then, the first target voltage u can be... S-S Analog-to-digital conversion is performed to obtain the target sequence. It can be understood that the target sequence is derived from the first target voltage u obtained at different sampling times. S-S The data is sorted according to the sampling time. Furthermore, the second target voltage u is obtained. grid Subsequently, the second target voltage u was also tested. grid Perform analog-to-digital conversion.

[0232] Based on the target sequence and the second target voltage after analog-to-digital conversion, determine whether the first target voltage meets the target conditions.

[0233] In actual execution, after obtaining the target sequence and the second target voltage after analog-to-digital conversion, the first target voltage u can be determined by combining the target sequence and the second target voltage after analog-to-digital conversion. S-S Does it meet the target conditions? That is, does it determine whether it starts from the first target voltage u? S-S The absolute value is less than the second threshold and changes to the first target voltage u S-S With the second target voltage u grid The absolute value of the difference is less than the third threshold, and whether it is from the first target voltage u S-S With the second target voltage u grid The absolute value of the difference is less than the third threshold change to the first target voltage u S-S The absolute value is less than the second threshold.

[0234] In some embodiments, the first target voltage u S-S Whether the absolute value is less than the second threshold can be determined based on the relationship between the absolute value of each data point in the target sequence and the second threshold.

[0235] In some embodiments, the first target voltage u S-S With the second target voltage u grid Whether the absolute value of the difference is less than the third threshold can be determined based on the data in the target sequence and the second target voltage u after analog-to-digital conversion. grid The judgment is made based on the relationship between the absolute value of the difference and the third threshold.

[0236] If the converter enters the dead zone state within the target time and the first target voltage meets the target conditions, the target switch is turned on.

[0237] In actual execution, the converter 2000 enters the dead zone state before the target duration is exceeded, and the voltage from the first target voltage u... S-S The absolute value is less than the second threshold and changes to the first target voltage u S-S With the second target voltage u grid The absolute value of the difference is less than the third threshold, or from the first target voltage u S-S With the second target voltage u grid The absolute value of the difference is less than the third threshold change to the first target voltage u S-S If the absolute value is less than the second threshold, the first target voltage u can be determined. S-S If the target conditions are met, a zero-voltage turn-on moment is detected; for other cases, the first target voltage u... S-S The target conditions are not met; a zero-voltage turn-on time was detected.

[0238] It's important to note that the purpose of analog-to-digital conversion is to convert analog signals into digital signals by the microcontroller. This makes it easier to process and perform logical judgments on the digital signals, and also facilitates the determination of the difference between two adjacent sample values. Analog signals are less flexible than digital signals in determining voltage change trends, requiring additional analog circuitry. However, the first target voltage u can be flexibly determined through code. S-S Whether the climbing speed in the dead zone changes from steep to flat and the first target voltage u S-S With the second target voltage u grid Whether the difference decreases to within the third threshold within the dead zone.

[0239] The above process can be illustrated in Figure 21. Referring to Figure 21, a converter control method may include the following steps.

[0240] Step 810: Measure the voltage u between the common source and the common source of the frequency converter. S-S and the voltage u across the bridge arm grid Perform sampling.

[0241] Step 820: Within the dead zone of the frequency converter, measure the voltage u between the common source and the common source. S-S During ADC conversion, the voltage u across the bridge arm grid The ADC results remained unchanged.

[0242] Step 830: Determine whether the ADC conversion result is calculated. S-S The absolute value changes from close to zero to close to u. grid or u S-S The absolute value of u is close to u grid Approaching zero.

[0243] If yes, proceed to step 840; otherwise, return to and re-execute step 820.

[0244] Step 840: When zero voltage turn-on is detected, turn on the target switch.

[0245] According to the converter control method provided in the embodiments of this application, by performing analog-to-digital conversion on the first target voltage obtained during the dead time to obtain a target sequence, and performing analog-to-digital conversion on the second target voltage, based on the target sequence and the second target voltage after analog-to-digital conversion, it is determined whether the absolute value of the first target voltage changes from being less than a second threshold to the absolute value of the difference between the first target voltage and the second target voltage being less than a third threshold, and whether the absolute value of the difference between the first target voltage and the second target voltage changes from being less than a third threshold to the absolute value of the first target voltage being less than a second threshold, and the zero-voltage turn-on time is determined. For the dead time control of the AC side frequency converter, through simple voltage detection, the zero-voltage turn-on time can be determined more accurately, thereby achieving dynamic optimization of the dead time and improving the overall conversion efficiency.

[0246] In some embodiments, if the first target voltage meets the target condition within a target duration after the converter enters the dead zone state, controlling the target switch in the converter to turn on includes: controlling the target switch to turn on if the converter has not entered the dead zone state for more than the target duration and a first interrupt signal or a second interrupt signal is received; the first interrupt signal is an interrupt signal triggered when the absolute value of the first target voltage drops below a second threshold; the second interrupt signal is an interrupt signal triggered when the absolute value of the difference between the first target voltage and the second target voltage drops below a third threshold.

[0247] In actual execution, an interrupt mechanism can be used to generate external interrupt signals. External interrupt signals can include two types: a first interrupt signal Ext1 and a second interrupt signal Ext2.

[0248] In some embodiments, u of the first target voltage S-S When the absolute value gradually decreases to below the second threshold, the first interrupt signal Ext1 can be triggered.

[0249] In some embodiments, u of the first target voltage S-S With the second target voltage u grid When the absolute value of the difference gradually decreases to less than the third threshold, the second interrupt signal Ext2 can be triggered.

[0250] The first target voltage u can be determined based on whether the first interrupt signal Ext1 and the second interrupt signal Ext2 are received. S-S Does it meet the target conditions? Upon receiving either the first interrupt signal Ext1 or the second interrupt signal Ext2, the first target voltage u can be determined. S-SIf the target conditions are met, a zero-voltage turn-on moment is detected; if neither the first interrupt signal Ext1 nor the second interrupt signal Ext2 is received, the first target voltage u can be determined. S-S The target conditions were not met; no zero-voltage turn-on moment was detected.

[0251] The above process can be illustrated in Figure 22. Referring to Figure 22, a converter control method may include the following steps.

[0252] Step 910: Waiting in the dead zone of the frequency converter.

[0253] Step 920: Determine whether the external first interrupt signal or the second interrupt signal edge is triggered.

[0254] If yes, proceed to step 930; otherwise, return to and re-execute step 910.

[0255] Step 930: When zero voltage turn-on is detected, turn on the target switch.

[0256] According to the converter control method provided in the embodiments of this application, the zero-voltage turn-on time is determined by whether a first interrupt signal and a second interrupt signal are received. For the dead-time control of the AC-side frequency converter, the zero-voltage turn-on time can be determined more accurately through simple voltage detection, thereby achieving dynamic optimization of the dead-time and improving the overall conversion efficiency.

[0257] In some embodiments, after acquiring the first target voltage based on the sampling period within the dead time, the method further includes: if the first target voltage does not meet the target condition after a target duration following the converter entering the dead state, controlling the target switch to turn on.

[0258] In actual execution, during the target duration after the converter 2000 enters the dead zone state, the first target voltage u S-S Even if none of the conditions are met, the target switching transistor can still be turned on.

[0259] It should be noted that the target duration can be the preset maximum dead time of the converter 2000. If the inductor current is insufficient to fully charge and discharge the output capacitor of the high-frequency complementary switch within the dead time, i.e., the zero-voltage turn-on moment cannot be detected, the target switch will still be turned on after the maximum dead time, allowing the converter 2000 to maintain normal operation.

[0260] According to the converter control method provided in the embodiments of this application, if the first target voltage does not meet the target condition after the target time following the converter entering the dead zone state, the target switch is turned on, thereby maintaining the normal operation of the converter.

[0261] The converter control method provided in this application can be executed by a converter control device. This application uses the example of a converter control device executing the converter control method to illustrate the converter control device provided in this application.

[0262] This application also provides a converter control device. As shown in FIG23, the converter control device includes a sampling module 1010 and a control module 1020.

[0263] The sampling module 1010 is used to acquire a first target voltage based on the sampling period during the dead time; the first target voltage is the voltage between the first terminal of the first switch and the first terminal of the third switch.

[0264] The control module 1020 is used to control the target switch in the converter to turn on when the first target voltage meets the target condition within the target time after the converter enters the dead zone state.

[0265] The converter 2000 is a frequency converter located on the AC side of the conversion circuit; the converter 2000 includes a first switch S1, a second switch S2, a third switch S3 and a fourth switch S4; the first terminal of the first switch S1 is connected to the first terminal of the second switch S2; the second terminal of the second switch S2 is connected to the second terminal of the third switch S3; and the first terminal of the third switch S3 is connected to the first terminal of the fourth switch S4.

[0266] According to the converter control device provided in the embodiments of this application, by acquiring the voltage between the first terminal of the first switch and the first terminal of the third switch, and determining the zero-voltage turn-on time based on whether the voltage meets the target conditions, the zero-voltage turn-on time can be more accurately determined for the dead-time control of the AC-side frequency converter through simple voltage detection, thereby achieving dynamic optimization of the dead-time and improving the overall conversion efficiency.

[0267] In some embodiments, the target condition includes: the absolute value of the difference between two adjacent first target voltages changes from being greater than a first threshold to being less than a first threshold.

[0268] In some embodiments, the sampling module 1010 is further configured to acquire a second target voltage during the dead time; the second target voltage is the voltage between the second terminal of the first switch and the second terminal of the fourth switch.

[0269] The target conditions include: a change from the absolute value of the first target voltage being less than the second threshold to the absolute value of the difference between the first target voltage and the second target voltage being less than the third threshold; or a change from the absolute value of the difference between the first target voltage and the second target voltage being less than the third threshold to the absolute value of the first target voltage being less than the second threshold.

[0270] In some embodiments, the sampling module 1010 includes:

[0271] The first sampling unit is used to acquire the first target voltage based on the sampling period during the dead time.

[0272] Control module 1020 includes:

[0273] The first analog-to-digital converter is used to perform analog-to-digital conversion on the first target voltage acquired during the dead time to obtain the target sequence;

[0274] The control unit is used to determine, based on the target sequence, whether the absolute value of the difference between two adjacent first target voltages changes from being greater than a first threshold to being less than a first threshold; and to control the target switch to turn on if the converter enters the dead zone state for no more than the target duration and the absolute value of the difference between two adjacent first target voltages changes from being greater than a first threshold to being less than a first threshold.

[0275] In actual implementation, the control module 1020 can perform analog-to-digital conversion using hardware circuitry. Referring to Figure 24, the control module 1020 may include an amplifier Amp1. Wherein, V offset This can be the first threshold; R1, R2, R3, and R4 can be four resistors; V cc It can be the supply voltage; the ADC can represent the output of the first analog-to-digital converter.

[0276] Referring to Figure 24, for u S-S The differential sampling is sent to the control module 1020 for ADC conversion. Within the dead zone of the frequency converter, the control module 1020 performs differential sampling on u. S-S The ADC sequence is used for feature judgment: when the difference between adjacent ADC results changes from greater than the first threshold to less than the first threshold, it indicates that the first target voltage u S-S After the switching transistor's output capacitor has completed its charging and discharging process, it has reached the clamped state, which is the moment when zero voltage is satisfied. At this time, the corresponding switching transistor dynamically ends the dead time after the turn-on dead time.

[0277] In some embodiments, the first analog-to-digital converter may be a high-speed ADC module.

[0278] In some embodiments, the sampling module 1010 includes:

[0279] The second sampling unit is used to acquire the second target voltage within the dead time.

[0280] Control module 1020 includes:

[0281] The first analog-to-digital converter is used to perform analog-to-digital conversion on the first target voltage acquired during the dead time to obtain the target sequence.

[0282] The second analog-to-digital converter is used to convert the second target voltage from analog to digital.

[0283] The control unit is used to determine whether the first target voltage meets the target conditions based on the target sequence and the second target voltage after analog-to-digital conversion; and to control the target switch to turn on if the converter enters the dead zone state for no more than the target duration and the first target voltage meets the target conditions.

[0284] In actual implementation, the control module 1020 can perform analog-to-digital conversion using hardware circuitry. Referring to Figure 25, the control module 1020 may include amplifiers Amp1 and Amp2. Wherein, V offset This can be a second threshold (for Amp1) and a third threshold (for Amp2); R 11 R 12 R 13 R 14 and R 21 R 22 R 23 and R 24 It can be eight resistors; V cc It can be the power supply voltage; ADC1 can represent the output result of the first analog-to-digital converter; ADC2 can represent the output result of the second analog-to-digital converter.

[0285] Referring to Figure 25, for u S-S and the voltage u across the bridge arm grid Differential sampling is performed, and the samples are fed into the control module 1020 for ADC conversion. Within the dead zone of the frequency converter, the control module 1020 performs... S-S Feature determination of the ADC sequence: when the u value is calculated from the ADC value S-S The voltage changes from near zero to near u grid , or u S-S Voltage from near u grid It becomes close to zero, indicating that u S-S After the voltage passes through the charging and discharging process of the output capacitor of the switching transistor, it is already close to the zero-voltage turn-on moment. At this time, the corresponding switching transistor dynamically ends the dead time after the turn-on dead time.

[0286] In some embodiments, the first analog-to-digital converter may be a high-speed ADC module.

[0287] In some embodiments, the second analog-to-digital converter may be a high-speed ADC module.

[0288] In some embodiments, the sampling module 1010 includes:

[0289] The second sampling unit is used to acquire the second target voltage within the dead time.

[0290] Control module 1020 includes:

[0291] A first comparator is used to compare a first target voltage and a second threshold; if the absolute value of the first target voltage is less than the second threshold, a first interrupt signal is triggered.

[0292] The second comparator is used to compare the first target voltage and the second target voltage; if the absolute value of the difference between the first target voltage and the second target voltage is less than a third threshold, a second interrupt signal is triggered.

[0293] The control unit is used to control the target switch to turn on when the converter enters the dead zone state for no more than the target duration and a first interrupt signal or a second interrupt signal is received.

[0294] In actual implementation, the control module 1020 can use hardware circuitry to perform analog-to-digital conversion and interrupt signal triggering. Referring to Figure 26, the control module 1020 may include amplifiers Amp1 and Amp2. Wherein, V offset This can be a second threshold (for Amp1 and Cmp1) and a third threshold (for Amp2); R 11 R 12 R 13 R 14 and R 21 R 22 R 23 and R 24 It can be eight resistors; V cc The supply voltage can be used; Cmp1 and Cmp2 can be the first comparator and the second comparator, respectively.

[0295] Referring to Figure 26, for u S-S and the voltage u across the bridge arm grid Differential sampling yields signals u1 and u2, and u1 is related to V. offset The values ​​of u1 and u2 are fed into comparator Cmp1, and u1 and u2 are fed into comparator Cmp2. The outputs of the two comparators are then fed into control module 1020. Within the dead zone of the frequency converter, it waits for an external interrupt. The external interrupt Ext1 trigger description is as follows: S-S After the switching transistor's output capacitor has undergone charging and discharging, it is close to zero; External interrupt Ext2 trigger description u S-S After the charging and discharging process of the output capacitor of the switching transistor, it is close to u. gird At this point, the zero-voltage turn-on condition is met, and the corresponding switching transistor dynamically ends the dead time after the dead time is turned on.

[0296] In some embodiments, the control module 1020 is further configured to control the target switch to turn on if the first target voltage does not meet the target condition after a target duration following the converter entering the dead zone state.

[0297] This application embodiment also provides a conversion circuit. As shown in FIG27, the conversion circuit includes: a frequency converter 1410 and a converter control device 1420 disposed on the AC side of the conversion circuit.

[0298] In actual implementation, the frequency converter 1410 can be the converter 2000 shown in Figures 15 to 17.

[0299] The converter control device 1420 can be connected to the two common source terminals of the frequency converter 1410, and the converter control device 1420 can also be connected to the control terminals of the four switching transistors included in the frequency converter 1410.

[0300] In some embodiments, the converter control device 1420 may also be connected to both ends of the bridge arm of the frequency converter 1410.

[0301] According to the converter control device provided in the embodiments of this application, by acquiring the voltage between the first terminal of the first switch and the first terminal of the third switch, and determining the zero-voltage turn-on time based on whether the voltage meets the target conditions, the zero-voltage turn-on time can be more accurately determined for the dead-time control of the AC-side frequency converter through simple voltage detection, thereby achieving dynamic optimization of the dead-time and improving the overall conversion efficiency.

[0302] The converter control device in this application embodiment can be an electronic device or a component within an electronic device, such as an integrated circuit or a chip. The electronic device can be a terminal or other devices besides a terminal. For example, the electronic device can be a mobile phone, tablet computer, laptop computer, PDA, in-vehicle electronic device, mobile internet device (MID), augmented reality (AR) / virtual reality (VR) device, robot, wearable device, ultra-mobile personal computer (UMPC), netbook, or personal digital assistant (PDA), etc. It can also be a server, network attached storage (NAS), personal computer (PC), television (TV), ATM, or self-service machine, etc. This application embodiment does not specifically limit the scope of the device.

[0303] The converter control device in this application embodiment can be a device with an operating system. This operating system can be Android, iOS, or other possible operating systems; this application embodiment does not specifically limit the specific operating system used.

[0304] The converter control device provided in this application embodiment can implement the various processes implemented in the method embodiments of Figures 14 to 22. To avoid repetition, it will not be described again here.

[0305] In some embodiments, as shown in FIG28, this application embodiment also provides an electronic device 1500, including a processor 1510, a memory 1520, and a computer program stored in the memory 1520 and executable on the processor 1510. When the program is executed by the processor 1510, it implements the various processes of the above-described converter control method embodiment and can achieve the same technical effect. To avoid repetition, it will not be described again here.

[0306] It should be noted that the electronic devices in the embodiments of this application include the mobile electronic devices and non-mobile electronic devices described above.

[0307] This application also provides a non-transitory computer-readable storage medium storing a computer program. When the computer program is executed by a processor, it implements the various processes of the above-described converter control method embodiments and achieves the same technical effect. To avoid repetition, it will not be described again here.

[0308] The processor is the processor in the electronic device described in the above embodiments. The readable storage medium includes computer-readable storage media, such as computer read-only memory (ROM), random access memory (RAM), magnetic disk, or optical disk.

[0309] This application also provides a computer program product, including a computer program that, when executed by a processor, implements the above-described converter control method.

[0310] The processor is the processor in the electronic device described in the above embodiments. The readable storage medium includes computer-readable storage media, such as computer read-only memory (ROM), random access memory (RAM), magnetic disk, or optical disk.

[0311] This application embodiment also provides a chip, which includes a processor and a communication interface. The communication interface is coupled to the processor. The processor is used to run programs or instructions to implement the various processes of the above-described converter control method embodiments and can achieve the same technical effect. To avoid repetition, it will not be described again here.

[0312] It should be understood that the chip mentioned in the embodiments of this application may also be referred to as a system-on-a-chip, system chip, chip system, or system-on-a-chip, etc.

[0313] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element. Furthermore, it should be noted that the scope of the methods and apparatuses in the embodiments of this application is not limited to performing functions in the order shown or discussed, but may also include performing functions substantially simultaneously or in the reverse order, depending on the functions involved. For example, the described methods may be performed in a different order than described, and various steps may be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.

[0314] Through the above description of the embodiments, those skilled in the art can clearly understand that the methods of the above embodiments can be implemented by means of software plus necessary general-purpose hardware platforms. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, can be embodied in the form of a computer software product. This computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) and includes several instructions to cause a terminal (which may be a mobile phone, computer, server, or network device, etc.) to execute the methods described in the various embodiments of this application.

[0315] The embodiments of this application have been described above with reference to the accompanying drawings. However, this application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

[0316] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0317] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A power supply circuit, characterized by comprising: The power supply circuit is connected to at least one driver. The power supply circuit obtains the power supply voltage based on the electrical energy generated when the target input voltage undergoes a high-frequency jump and provides it to at least one driver. The target input voltage is the input voltage between the sources of any two sets of switching elements in the power circuit. The power circuit includes at least two sets of switching elements, each set of switching elements is configured with a common source, and at least one driver is connected to one set of switching elements to drive the set of switching elements.

2. The power supply circuit according to claim 1, characterized in that, The power supply circuit includes: a power supply module and a control module; The power supply module is connected to the source of any two sets of switching elements and is used to obtain the first output voltage based on the electrical energy generated when the target input voltage undergoes a high-frequency jump. The control module is connected to the power supply module and is used to obtain the power supply voltage based on the first output voltage and provide it to the driver.

3. The power supply circuit of claim 2, wherein, The power supply module includes: The system comprises a first capacitor, a second capacitor, a first diode, and a second diode; wherein one end of the first capacitor is connected to the source of a first set of switching elements, the first set of switching elements being one of any two sets of switching elements; the other end of the first capacitor is connected to the cathode of the first diode; the anode of the first diode is connected to one end of the second capacitor; the anode of the second diode is connected to the cathode of the first diode; the cathode of the second diode is connected to the other end of the second capacitor; the other end of the second capacitor is connected to the source of a second set of switching elements, the second set of switching elements being the other of any two sets of switching elements; and the two ends of the second capacitor are used to provide the first output voltage.

4. The power supply circuit according to claim 3, characterized in that, The control module includes: A first Zener diode, the two ends of which are respectively connected to the two ends of the second capacitor, is used to control the first output voltage provided by the two ends of the second capacitor.

5. A power conversion device, characterized by, include: A power circuit for power conversion includes at least two sets of switching elements, each set of switching elements having a common source. At least one driver, connected to a set of said switching elements, is used to drive the set of said switching elements; At least one power supply circuit as described in any one of claims 1 to 4, the power supply circuit being connected to at least one driver, obtaining a power supply voltage based on the electrical energy generated when a target input voltage undergoes a high-frequency jump, and providing it to the driver, wherein the target input voltage is the input voltage between the sources of any two sets of switching elements in the power circuit.

6. The power conversion device of claim 5, wherein, The power circuit is a frequency converter, and the target input voltage is an AC pulse voltage. The AC pulse voltage is generated by the high-frequency switching action of the switching elements on the primary side of the frequency converter and / or by the high-frequency switching action of the switching elements on the secondary side of the frequency converter.

7. A converter control method characterized by, The converter is a frequency converter disposed on the AC side of the conversion circuit; the converter includes a first switch, a second switch, a third switch, and a fourth switch; a first terminal of the first switch is connected to a first terminal of the second switch; a second terminal of the second switch is connected to a second terminal of the third switch; a first terminal of the third switch is connected to a first terminal of the fourth switch; the control method includes: During the dead time, a first target voltage is obtained based on the sampling period; the first target voltage is the voltage between the first terminal of the first switch and the first terminal of the third switch. If the first target voltage meets the target condition within the target time after the converter enters the dead zone state, the target switch in the converter is controlled to be turned on.

8. The inverter control method according to claim 7, characterized by, The target condition includes: the absolute value of the difference between two consecutive first target voltages changes from being greater than the first threshold to being less than the first threshold.

9. The inverter control method according to claim 7, characterized by, Before turning on the target switch in the converter when the first target voltage meets the target condition, the method further includes: During the dead time, a second target voltage is acquired; the second target voltage is the voltage between the second terminal of the first switch and the second terminal of the fourth switch. The target conditions include: a change from the absolute value of the first target voltage being less than a second threshold to the absolute value of the difference between the first target voltage and the second target voltage being less than a third threshold; or a change from the absolute value of the difference between the first target voltage and the second target voltage being less than the third threshold to the absolute value of the first target voltage being less than the second threshold.

10. The inverter control method according to claim 8, characterized by, The step of controlling the target switch in the converter to turn on during the target time period after the converter enters the dead zone state, provided that the first target voltage meets the target condition, includes: The first target voltage acquired within the dead time is subjected to analog-to-digital conversion to obtain the target sequence; Based on the target sequence, determine whether the absolute value of the difference between two adjacent first target voltages changes from being greater than the first threshold to being less than the first threshold. If the converter enters the dead zone state for no more than the target duration, and the absolute value of the difference between two adjacent first target voltages changes from being greater than the first threshold to being less than the first threshold, the target switch is controlled to turn on.

11. The inverter control method according to claim 9, characterized by, The step of controlling the target switch in the converter to turn on during the target time period after the converter enters the dead zone state, provided that the first target voltage meets the target condition, includes: The first target voltage acquired within the dead time is subjected to analog-to-digital conversion to obtain a target sequence, and the second target voltage is subjected to analog-to-digital conversion as well. Based on the target sequence and the second target voltage after analog-to-digital conversion, determine whether the first target voltage meets the target conditions; If the converter enters the dead zone state for no more than the target duration and the first target voltage meets the target condition, the target switch is controlled to turn on.

12. The inverter control method according to claim 9, characterized by, The step of controlling the target switch in the converter to turn on during the target time period after the converter enters the dead zone state, provided that the first target voltage meets the target condition, includes: If the converter enters a dead zone state for no more than the target duration and receives a first interrupt signal or a second interrupt signal, the target switch is turned on. The first interrupt signal is triggered when the absolute value of the first target voltage drops below the second threshold. The second interrupt signal is triggered when the absolute value of the difference between the first target voltage and the second target voltage drops below the third threshold.

13. The converter control method according to any one of claims 7-12, characterized by, After acquiring the first target voltage based on the sampling period within the dead time, the method further includes: If, after a target duration following the converter entering a dead zone, the first target voltage does not meet the target conditions, the target switch is turned on.

14. A converter control device, characterized by The converter is a frequency converter disposed on the AC side of the conversion circuit; the converter includes a first switch, a second switch, a third switch, and a fourth switch; a first terminal of the first switch is connected to a first terminal of the second switch; a second terminal of the second switch is connected to a second terminal of the third switch; a first terminal of the third switch is connected to a first terminal of the fourth switch; the converter control device includes: The sampling module is used to acquire a first target voltage based on the sampling period during the dead time; the first target voltage is the voltage between the first terminal of the first switch and the first terminal of the third switch. The control module is used to control the target switch in the converter to turn on during the target time after the converter enters the dead zone state, provided that the first target voltage meets the target conditions.

15. A conversion circuit, characterized by include: A frequency converter and a converter control device as described in claim 14 are disposed on the AC side of the conversion circuit.

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