Synchronous rectifier tube control method and device of digital resonance circuit

Abstract

The embodiment of the invention discloses a synchronous rectifier tube control method and device of a digital resonance circuit. According to the technical scheme provided by the embodiment of the invention, the current difference value of the current output current and the current output current of the current resonant circuit by the digital power supply is determined, and the loop voltage error value of the current resonant circuit is determined according to the output voltage of the current resonant circuit by the digital power supply and the feedback voltage received by the digital power supply; obtaining the switching frequency of a synchronous rectifier tube of the current resonant circuit; and under the condition that the current difference value, the loop voltage error value and the switching frequency meet set conditions, closing a synchronous rectifier tube of the current resonant circuit. By adopting the technical means, the situation of false detection of current backflow of the synchronous rectifier tube can be avoided, and the accuracy of current backflow detection of the synchronous rectifier tube is improved. And when it is determined that the current flows backwards, the synchronous rectifier tube is closed, the circuit and the load are prevented from being damaged, and the operation safety of the circuit is guaranteed.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of digital power supply technology, and in particular to a synchronous rectifier control method and device for a digital resonant circuit. Background Art

[0002] At present, when the resonant circuit of a digital power supply switches from a full-load state to a no-load state, it may cause a current backflow phenomenon in the synchronous rectifier, which may have an adverse effect on the circuit. For this reason, the controller of the synchronous rectifier usually detects the output current of the digital power supply and turns off the synchronous rectifier when the output current is less than the set value to avoid current backflow and damage to the circuit.

[0003] However, it is difficult to accurately determine whether the synchronous rectifier will have current backflow simply based on the output current of the digital power supply, and there is a certain detection error. When the circuit changes from full load to light load, current backflow may also occur, which will affect the safe operation of the resonant circuit. Summary of the invention

[0004] The embodiments of the present application provide a method and device for controlling a synchronous rectifier tube of a digital resonant circuit, which can accurately detect the current backflow phenomenon of the synchronous rectifier tube in the resonant circuit, timely control the shutdown of the synchronous rectifier tube, and solve the problem of detection error of the current backflow of the synchronous rectifier tube.

[0005] In a first aspect, an embodiment of the present application provides a synchronous rectifier control method for a digital resonant circuit, comprising:

[0006] Determine the current difference between the two output currents of the digital power supply to the current resonant circuit, determine the loop voltage error value of the current resonant circuit according to the output voltage of the digital power supply to the current resonant circuit and the feedback voltage received by the digital power supply, and obtain the switching frequency of the synchronous rectifier tube of the current resonant circuit;

[0007] When the current difference, the loop voltage error value and the switching frequency meet the set conditions, the synchronous rectifier tube of the current resonant circuit is turned off.

[0008] In a second aspect, an embodiment of the present application provides a synchronous rectifier control device for a digital resonant circuit, comprising:

[0009] A determination module is used to determine the current difference between the two output currents of the digital power supply to the current resonant circuit, determine the loop voltage error value of the current resonant circuit according to the output voltage of the digital power supply to the current resonant circuit and the feedback voltage received by the digital power supply, and obtain the switching frequency of the synchronous rectifier tube of the current resonant circuit;

[0010] The control module is used to turn off the synchronous rectifier tube of the current resonant circuit when the current difference, the loop voltage error value and the switching frequency meet the set conditions.

[0011] In a third aspect, an embodiment of the present application provides an electronic device, including:

[0012] memory and one or more processors;

[0013] A memory for storing one or more programs;

[0014] When one or more programs are executed by one or more processors, the one or more processors implement the synchronous rectifier control method of the digital resonant circuit as described in the first aspect.

[0015] In a fourth aspect, an embodiment of the present application provides a storage medium comprising computer executable instructions, which, when executed by a computer processor, are used to execute the synchronous rectifier control method of the digital resonant circuit as in the first aspect.

[0016] The embodiment of the present application determines the current difference between the two output currents of the digital power supply to the current resonant circuit, determines the loop voltage error value of the current resonant circuit according to the output voltage of the digital power supply to the current resonant circuit and the feedback voltage received by the digital power supply, and obtains the switching frequency of the synchronous rectifier of the current resonant circuit; when the current difference, loop voltage error value and switching frequency meet the set conditions, the synchronous rectifier of the current resonant circuit is turned off. By adopting the above technical means, by comprehensively judging whether the synchronous rectifier has current backflow, the current backflow of the synchronous rectifier is misdetected, and the accuracy of the detection of current backflow of the synchronous rectifier is improved. And when it is determined that current backflow occurs, the synchronous rectifier is turned off to avoid damage to the circuit and load, and to ensure the safety of circuit operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a flow chart of a synchronous rectifier control method of a digital resonant circuit provided in Embodiment 1 of the present application;

[0018] Figure 2 This is a schematic diagram of the connection of the synchronous rectifier tube in the first embodiment of the present application;

[0019] Figure 3 is a control flow chart of the synchronous rectifier tube in the first embodiment of the present application;

[0020] Figure 4 Schematic diagram of the driving voltage of the synchronous rectifier tube when switching from full load to no load in the first embodiment of the present application;

[0021] Figure 5It is a structural schematic diagram of a synchronous rectifier control device of a digital resonant circuit provided in Embodiment 2 of the present application;

[0022] Figure 6 It is a structural schematic diagram of an electronic device provided in Example 3 of the present application. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical scheme and advantages of the present application clearer, the specific embodiments of the present application are further described in detail below in conjunction with the accompanying drawings. It is understood that the specific embodiments described herein are only used to explain the present application, rather than to limit the present application. It should also be noted that, for the convenience of description, only the part related to the present application but not all the contents are shown in the accompanying drawings. Before discussing the exemplary embodiments in more detail, it should be mentioned that some exemplary embodiments are described as processes or methods depicted as flow charts. Although the flow chart describes each operation (or step) as a sequential process, many of the operations therein can be implemented in parallel, concurrently or simultaneously. In addition, the order of each operation can be rearranged. The process can be terminated when its operation is completed, but it can also have additional steps not included in the accompanying drawings. The process can correspond to a method, a function, a procedure, a subroutine, a subprogram, etc.

[0024] The synchronous rectifier control method of the digital resonant circuit provided in the present application aims to accurately determine whether current backflow occurs in the synchronous rectifier by combining the current difference, loop voltage error value and switching frequency of the current resonant circuit, and then, when it is determined that current backflow occurs in the synchronous rectifier, shut down the synchronous rectifier in time to ensure the safe operation of the resonant circuit.

[0025] Among them, the resonant circuit (LLC circuit) is a multi-channel converter circuit, and its structure mainly consists of a synchronous rectifier, a variable high-voltage transformer, a switch module and a filter circuit. The switch circuit composed of the synchronous rectifier and the switch module can achieve high-efficiency conversion, and the variable high-voltage transformer can achieve the adjustability of the power supply output voltage. The filter circuit can effectively suppress the electromagnetic interference of the power supply output, thereby improving the reliability of the system. Unlike the traditional PWM (pulse width section) converter, the resonant circuit can realize a circuit with a constant output voltage by controlling the switching frequency of the synchronous rectifier (frequency adjustment), thereby reducing the switching loss of the power supply and improving the efficiency and power density of the power converter.

[0026] The original function of the resonant circuit is to input a DC voltage, that is, to convert the DC power supply voltage into an AC voltage. In this process, the current is usually more important than the voltage. The circuit works by accurately converting the DC voltage to the required frequency and phase in order to meet the working requirements of the electronic equipment. The inductor and capacitor in the resonant circuit can generate the required high-frequency oscillation signal by adjusting their values. The key feature of this circuit is its ability to stably generate high-frequency oscillations and its ability to self-regulate when other conditions change. This feature can effectively ensure that the electronic equipment maintains stable performance under various loads.

[0027] When the digital power supply supplies power to the load through the resonant circuit, the input current switches from the full-load state to the no-load state, which may cause the synchronous rectifier in the resonant circuit to have a current backflow phenomenon. To this end, in the related art, the following four solutions are provided to solve the current backflow phenomenon of the synchronous rectifier. Among them, the first solution is to select a digital signal processor (DSP) with higher cost and better performance to control the synchronous rectifier, increase the response bandwidth of the control loop, improve the response speed, and respond to the current backflow phenomenon in time. The second solution is to increase the anti-backflow hardware circuit of the synchronous rectifier, and turn off the synchronous rectifier by detecting the voltage difference across the synchronous rectifier to prevent energy backflow. The third solution is to directly replace the synchronous rectifier with higher voltage stress. The fourth solution is to detect the size of the output current through the software control strategy to turn off the synchronous rectifier. Turn off the synchronous rectifier when the current is less than a certain value. For the way of adding or replacing hardware, it will undoubtedly increase the design cost of the circuit. Regarding the method of controlling the synchronous rectifier through software control strategy, since it simply determines whether the current is switched from full load to no load based on the output current of the digital power supply, and then determines whether the synchronous rectifier will have current backflow. This detection method has a certain detection error. Since the synchronous rectifier may also have current backflow when the resonant circuit changes from full load to light load, it is impossible to accurately determine the current backflow phenomenon simply based on the output current.

[0028] Based on this, a synchronous rectifier control method of a digital resonant circuit is provided in an embodiment of the present application to improve the detection accuracy of current backflow without increasing the circuit cost and solve the problem of detection error of current backflow of the synchronous rectifier.

[0029] Embodiment 1:

[0030] Figure 1 A flow chart of a synchronous rectifier control method for a digital resonant circuit provided in Embodiment 1 of the present application is given. The synchronous rectifier control method for a digital resonant circuit provided in this embodiment can be executed by a digital signal processor.

[0031] The following description is made by taking a digital signal processor as the main body of the synchronous rectifier control method for a digital resonant circuit as an example. Figure 1 The synchronous rectifier control method of the digital resonant circuit specifically includes:

[0032] S110, determining a current difference between two output currents of the digital power supply to the current resonant circuit, determining a loop voltage error value of the current resonant circuit according to the output voltage of the digital power supply to the current resonant circuit and a feedback voltage received by the digital power supply, and obtaining a switching frequency of a synchronous rectifier tube of the current resonant circuit;

[0033] S120: When the current difference, the loop voltage error value and the switching frequency meet the set conditions, the synchronous rectifier tube of the current resonant circuit is turned off.

[0034] When performing current backflow detection and shutdown control of the synchronous rectifier, the embodiment of the present application comprehensively detects the operating state of the resonant circuit in multiple dimensions to improve the current backflow detection accuracy of the synchronous rectifier. It is understandable that it is easy to make judgment errors when judging whether the synchronous rectifier has current backflow based solely on the output current of the digital power supply. Therefore, the present application comprehensively judges the current backflow phenomenon based on the current difference, loop voltage error value and switching frequency of the current resonant circuit to achieve the effect of improving the current backflow detection accuracy and accurately detecting the current backflow.

[0035] Among them, refer to Figure 2 , the resonant circuit 12 is connected to the digital power supply 11 and the load 13 respectively, and its synchronous rectifier 121 is controlled by the digital signal processor 14, and the digital power supply 11 supplies power to the load 13 through the resonant circuit 12. In this process, the digital signal processor detects the operating status of the resonant circuit 12 in real time, and comprehensively judges whether the synchronous rectifier has current backflow in combination with the current difference value, loop voltage error value and switching frequency of the current resonant circuit. When the synchronous rectifier is detected to have current backflow, the synchronous rectifier 121 is controlled to be turned off to ensure the safe operation of the resonant circuit and protect the load and power supply from damage.

[0036] Specifically, for the current difference of the resonant circuit, the output current of the digital power supply to the current resonant circuit and the output current of the previous acquisition cycle are detected and determined, and the difference between the two is made to determine the corresponding current difference. It can be understood that when the digital power supply switches the resonant circuit from full load to no-load or light load state, the synchronous rectifier current backflow phenomenon may occur. When the resonant circuit is switched from full load to no-load or light load state, the difference in the output current of the digital power supply to the resonant circuit before and after the two acquisition cycles will reach the corresponding difference. Therefore, the present application determines the current difference to determine whether the synchronous rectifier has a current backflow phenomenon.

[0037] For the loop voltage error value of the current resonant circuit, the output voltage of the digital power supply to the current resonant circuit and the feedback voltage received by the digital power supply are detected, and the difference between the two is determined to determine the loop voltage error. It can be understood that, in general, when the digital power supply is powered normally, its output voltage Vout and the received feedback voltage Vin should be the same. When the synchronous rectifier has current backflow, its feedback voltage Vin will become larger, that is, the loop voltage error Vout-Vin will be less than 0 and less than a certain voltage value. Based on this phenomenon, the present application determines the loop voltage error by detecting the output voltage of the digital power supply to the current resonant circuit and the feedback voltage received by the digital power supply, so as to judge whether the synchronous rectifier has current backflow in combination with the loop voltage error.

[0038] Regarding the switching frequency of the synchronous rectifier, when the resonant circuit jumps from a full-load state to a no-load or light-load state, the switching frequency of the synchronous rectifier is limited by the performance of the digital signal processor and cannot be changed from a low frequency to a high frequency. And at this time, the switching frequency of the synchronous rectifier will also be lower than that in a steady state. Based on this feature, the present application detects the switching frequency of the synchronous rectifier to determine whether the synchronous rectifier has a current backflow phenomenon in combination with the switching frequency.

[0039] Based on the above-determined current difference, loop voltage error value and switching frequency of the current resonant circuit, it can be comprehensively judged whether the synchronous rectifier of the current resonant circuit has current backflow. Prior to this, the corresponding setting conditions are set according to the current difference, loop voltage error value and switching frequency collected when the synchronous rectifier has current backflow. After that, when the digital signal processor detects whether the synchronous rectifier has current backflow in real time, by comparing the current difference, loop voltage error value and switching frequency of the current resonant circuit with the setting conditions, it can accurately judge whether the current backflow phenomenon occurs in the current synchronous rectifier. Then, when it is determined that the current backflow phenomenon occurs, the synchronous rectifier is turned off in time to protect the safe operation of the circuit.

[0040] Optionally, the current difference, loop voltage error value and switching frequency meet set conditions, including that the current difference is greater than a set current threshold, the loop voltage error value is less than a set voltage threshold, and the switching frequency is less than a set frequency.

[0041] Reference Figure 3, the digital signal processor performs current backflow detection of the synchronous rectifier through its interrupt processing function, and then executes switch control of the synchronous rectifier. When detecting current backflow, the current difference Iout1 of the current digital power supply to the resonant circuit and the output current Iout2 of the digital power supply to the resonant circuit in the previous acquisition cycle are detected, and then the current difference Iout1-Iout2 is determined, and it is compared with the set current threshold △Iout. When Iout1-Iout2>△Iout, it is determined that the current synchronous rectifier meets the first judgment condition of current backflow, and enters the comparison of the next judgment condition. When Iout1-Iout2≤△Iout, it is determined that the current synchronous rectifier does not have current backflow, and the function returns directly, and the current backflow judgment process is re-executed in the next current backflow judgment cycle.

[0042] After determining that the current synchronous rectifier meets the first judgment condition of current backflow, the loop voltage error value is calculated and compared with the set voltage threshold Err0rl. When the loop voltage error value is less than Err0rl, it is determined that the current synchronous rectifier meets the second judgment condition of current backflow. When the loop voltage error value is greater than or equal to Err0rl, it is determined that the current synchronous rectifier does not have current backflow, and the function returns directly, and the current backflow judgment process is re-executed in the next current backflow judgment cycle.

[0043] After determining that the current synchronous rectifier tube meets the second judgment condition of current backflow, the switching frequency of the synchronous rectifier tube is detected and compared with the set frequency Frequencyl. When the switching frequency is less than Frequencyl, it is determined that the current synchronous rectifier tube meets the third judgment condition of current backflow. When the switching frequency is greater than or equal to Frequencyl, it is determined that the current synchronous rectifier tube does not have current backflow, and the function returns directly, and the current backflow judgment process is re-executed in the next current backflow judgment cycle.

[0044] When it is determined that the above current difference, loop voltage error value and switching frequency meet the set conditions, the synchronous rectifier can be turned off to protect the circuit and load. In this way, by combining the operating parameters when the synchronous rectifier has current backflow, the set conditions are configured and compared to determine whether the synchronous rectifier has current backflow, so that the synchronous rectifier current backflow can be accurately determined.

[0045] Optionally, the current difference, loop voltage error value and switching frequency meet the set conditions, including: the weighted score of the current difference, loop voltage error value and switching frequency reaches the set score. Different from the above-mentioned method of judging the current backflow phenomenon of the synchronous rectifier by setting the corresponding parameter threshold, the present application can also set a set score according to the weighted score of the current difference, loop voltage error value and switching frequency when the synchronous rectifier has current backflow. And set the corresponding weight coefficient for the influence weight of the current backflow phenomenon of the synchronous rectifier according to the current difference, loop voltage error value and switching frequency. Afterwards, when the current backflow phenomenon is detected, the above-mentioned current difference, loop voltage error value and switching frequency are weightedly calculated with the corresponding weight coefficient to obtain the corresponding weighted score. The weighted score is compared with the set score. When the weighted score reaches the set peak value, it is determined that the current backflow occurs in the current synchronous rectifier. In this way, by combining the set score and the corresponding weight coefficient of the weighted score configured by the operating parameters when the synchronous rectifier tube has current backflow, the weighted score comparison of the current difference, loop voltage error value and switching frequency is used to judge whether the synchronous rectifier tube has current backflow, so that the synchronous rectifier current backflow can be accurately determined.

[0046] It should be noted that in actual applications, different setting conditions can be adaptively set according to the above-mentioned current difference, loop voltage error value and switching frequency to determine whether current backflow occurs in the synchronous rectifier tube. This application does not impose fixed restrictions on the specific determination method, which will not be elaborated here.

[0047] Furthermore, after the synchronous rectifier of the current resonant circuit is turned off, it also includes: after counting the set switching cycle, reopening the synchronous rectifier of the current resonant circuit. It can be understood that in order to avoid the influence of current backflow on the circuit, when the current backflow phenomenon is detected, it is necessary to promptly control the synchronous rectifier to shut down. Then, when the current backflow phenomenon disappears, the synchronous rectifier can be turned on to re-run the resonant circuit and ensure the normal power supply of the load. Therefore, the embodiment of the present application reopens the synchronous rectifier of the current resonant circuit after closing the synchronous rectifier setting cycle. Generally speaking, the setting cycle needs to meet the time for the current backflow phenomenon to disappear, so as to avoid the situation where the current backflow phenomenon still exists when the synchronous rectifier is reopened.

[0048] Optionally, the setting switching period is set according to the duration of the current backflow of the synchronous rectifier of the current digital resonant circuit. By setting the set switching period according to the duration of the current backflow of the synchronous rectifier, more accurate synchronous rectifier switch control can be achieved to avoid the synchronous rectifier being closed for too long and affecting the load power supply. Among them, the duration of the current backflow can be obtained by detecting the duration of the current backflow when the current backflow phenomenon actually occurs in the synchronous rectifier. In order to avoid the randomness of the data, multiple detections can be performed to obtain the average value as the duration of the current backflow. Then the detected duration of the current backflow should be equal to the duration of the set switching period.

[0049] In addition, in order to further improve the accuracy of synchronous rectifier switch control, the set period can also be adaptively determined in combination with different values ​​of current difference, loop voltage error value and switching frequency. It is understandable that in the case of current backflow, different values ​​of current difference, loop voltage error value and switching frequency may lead to different durations of current backflow. In actual tests, the corresponding duration of current backflow can be recorded according to different values ​​of current difference, loop voltage error value and switching frequency in the case of current backflow. When current backflow occurs later, the preset duration of current backflow is queried according to the values ​​of current difference, loop voltage error value and switching frequency, so as to configure the set period and achieve more accurate synchronous rectifier switch control.

[0050] Afterwards, the synchronous rectifier tube of the digital resonant circuit is restarted, including: soft starting the synchronous rectifier tube of the digital resonant circuit based on the set start-up time.

[0051] The synchronous rectifier tube's drive voltage is gradually increased from 0 to the rated voltage within a set time to achieve soft start of the synchronous rectifier tube. This can avoid the impact on the circuit when the synchronous rectifier tube's drive voltage changes from 0 to the rated voltage instantaneously, and ensure the smooth start of the synchronous rectifier tube.

[0052] In addition, after the synchronous rectifier tube of the current resonant circuit is turned on again, the method further includes: increasing the loop response parameter of the current resonant circuit to increase the switching frequency.

[0053] It is understandable that, referring to Figure 4 When the current backflow occurs in the synchronous rectifier, the output current of the resonant circuit switches from the full load state Imax to the no-load or light load state Imin. The Vds voltage of the synchronous rectifier (the voltage between the drain and the source, i.e., the switch drive voltage) is as follows: Figure 4As shown. It can be seen that when the resonant circuit switches from a full-load state to a no-load or light-load state, the switching frequency of the synchronous rectifier is limited by the bandwidth of the control loop and will not increase immediately. There is a certain delay in the adjustment of its switching frequency. Based on this, when the synchronous rectifier is turned on again, the loop response parameters of the current resonant circuit can be increased so that the control loop of the digital signal processor can quickly respond to the current backflow phenomenon, increase the switching frequency of the synchronous rectifier during current backflow, and accurately control the switching of the synchronous rectifier.

[0054] In the above, by determining the current difference between the two output currents of the digital power supply to the current resonant circuit, the loop voltage error value of the current resonant circuit is determined according to the output voltage of the digital power supply to the current resonant circuit and the feedback voltage received by the digital power supply, and the switching frequency of the synchronous rectifier of the current resonant circuit is obtained; when the current difference, loop voltage error value and switching frequency meet the set conditions, the synchronous rectifier of the current resonant circuit is turned off. By adopting the above technical means, by comprehensively judging whether the synchronous rectifier has current backflow, the false detection of the synchronous rectifier current backflow can be avoided, and the accuracy of the synchronous rectifier current backflow detection can be improved. And when it is determined that current backflow occurs, the synchronous rectifier is turned off to avoid damage to the circuit and load, and to ensure the safety of circuit operation.

[0055] Embodiment 2:

[0056] Based on the above embodiments, Figure 5 This is a structural diagram of a synchronous rectifier control device for a digital resonant circuit provided in the second embodiment of the present application. Figure 5 The synchronous rectifier control device of the digital resonant circuit provided in this embodiment specifically includes: a determination module 21 and a control module 22.

[0057] Among them, the determination module 21 is used to determine the current difference between the two output currents of the digital power supply to the current resonant circuit before and after, determine the loop voltage error value of the current resonant circuit according to the output voltage of the digital power supply to the current resonant circuit and the feedback voltage received by the digital power supply, and obtain the switching frequency of the synchronous rectifier tube of the current resonant circuit;

[0058] The control module 22 is used to turn off the synchronous rectifier tube of the current resonant circuit when the current difference, the loop voltage error value and the switching frequency meet the set conditions.

[0059] Among them, the current difference, loop voltage error value and switching frequency meet the set conditions, including:

[0060] The current difference is greater than the set current threshold, the loop voltage error value is less than the set voltage threshold, and the switching frequency is less than the set frequency.

[0061] Alternatively, the current difference, loop voltage error, and switching frequency meet the set conditions, including:

[0062] The weighted score of the current difference, loop voltage error and switching frequency reaches the set score.

[0063] Specifically, after the synchronous rectifier tube of the current resonant circuit is turned off, the method further includes:

[0064] After counting the set switching cycles, the synchronous rectifier tube of the current resonant circuit is turned on again.

[0065] The switching period is set according to the duration of the current backflow of the synchronous rectifier tube of the current digital resonant circuit.

[0066] Restart the synchronous rectifier of the digital resonant circuit, including:

[0067] The synchronous rectifier tube of the digital resonant circuit is soft-started based on the set startup time.

[0068] Specifically, after the synchronous rectifier tube of the current resonant circuit is reopened, the method further includes:

[0069] The loop response parameters of the current resonant circuit are adjusted to increase the switching frequency.

[0070] In the above, by determining the current difference between the two output currents of the digital power supply to the current resonant circuit, the loop voltage error value of the current resonant circuit is determined according to the output voltage of the digital power supply to the current resonant circuit and the feedback voltage received by the digital power supply, and the switching frequency of the synchronous rectifier of the current resonant circuit is obtained; when the current difference, loop voltage error value and switching frequency meet the set conditions, the synchronous rectifier of the current resonant circuit is turned off. By adopting the above technical means, by comprehensively judging whether the synchronous rectifier has current backflow, the false detection of the synchronous rectifier current backflow can be avoided, and the accuracy of the synchronous rectifier current backflow detection can be improved. And when it is determined that current backflow occurs, the synchronous rectifier is turned off to avoid damage to the circuit and load, and to ensure the safety of circuit operation.

[0071] The synchronous rectifier control device for a digital resonant circuit provided in the second embodiment of the present application can be used to execute the synchronous rectifier control method for a digital resonant circuit provided in the first embodiment above, and has corresponding functions and beneficial effects.

[0072] Embodiment three:

[0073] Embodiment 3 of the present application provides an electronic device, referring to Figure 6The electronic device includes: a processor 31, a memory 32, a communication module 33, an input device 34 and an output device 35. The number of processors in the electronic device can be one or more, and the number of memories in the electronic device can be one or more. The processor, memory, communication module, input device and output device of the electronic device can be connected via a bus or other means.

[0074] As a computer-readable storage medium, the memory can be used to store software programs, computer executable programs and modules, such as the program instructions / modules corresponding to the synchronous rectifier control method of the digital resonant circuit described in any embodiment of the present application (for example, the determination module and the control module in the synchronous rectifier control device of the digital resonant circuit). The memory may mainly include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application required for at least one function; the storage data area may store data created according to the use of the device, etc. In addition, the memory may include a high-speed random access memory, and may also include a non-volatile memory, such as at least one disk storage device, a flash memory device, or other non-volatile solid-state storage device. In some instances, the memory may further include a memory remotely arranged relative to the processor, and these remote memories may be connected to the device via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0075] The communication module is used for data transmission.

[0076] The processor executes various functional applications and data processing of the device by running the software programs, instructions and modules stored in the memory, that is, realizes the synchronous rectifier control method of the above-mentioned digital resonant circuit.

[0077] The input device can be used to receive input digital or character information and generate key signal input related to user settings and function control of the device. The output device can include display devices such as display screens.

[0078] The electronic device provided above can be used to execute the synchronous rectifier control method of the digital resonant circuit provided in the above embodiment 1, and has corresponding functions and beneficial effects.

[0079] Embodiment 4:

[0080] An embodiment of the present application also provides a storage medium containing computer executable instructions, which, when executed by a computer processor, are used to execute a synchronous rectifier control method for a digital resonant circuit. The synchronous rectifier control method for a digital resonant circuit includes: determining a current difference between two output currents of a digital power supply to a current resonant circuit before and after, determining a loop voltage error value of the current resonant circuit based on the output voltage of the digital power supply to the current resonant circuit and a feedback voltage received by the digital power supply, and obtaining a switching frequency of the synchronous rectifier of the current resonant circuit; and turning off the synchronous rectifier of the current resonant circuit when the current difference, the loop voltage error value and the switching frequency meet set conditions.

[0081] Storage medium - any of various types of memory devices or storage devices. The term "storage medium" is intended to include: installation media, such as CD-ROM, floppy disk or tape device; computer system memory or random access memory, such as DRAM, DDR RAM, SRAM, EDO RAM, Rambus RAM, etc.; non-volatile memory, such as flash memory, magnetic media (such as hard disk or optical storage); registers or other similar types of memory elements, etc. Storage media may also include other types of memory or combinations thereof. In addition, the storage medium may be located in the first computer system in which the program is executed, or may be located in a different second computer system, which is connected to the first computer system via a network (such as the Internet). The second computer system can provide program instructions to the first computer for execution. The term "storage medium" may include two or more storage media residing in different locations (for example, in different computer systems connected by a network). The storage medium may store program instructions (for example, embodied as a computer program) that can be executed by one or more processors.

[0082] Of course, the storage medium containing computer executable instructions provided in an embodiment of the present application is not limited to the synchronous rectifier control method for a digital resonant circuit as described above, and can also execute related operations in the synchronous rectifier control method for a digital resonant circuit provided in any embodiment of the present application.

[0083] The synchronous rectifier control device, storage medium and electronic device of the digital resonant circuit provided in the above embodiments can execute the synchronous rectifier control method of the digital resonant circuit provided in any embodiment of the present application. For technical details not described in detail in the above embodiments, please refer to the synchronous rectifier control method of the digital resonant circuit provided in any embodiment of the present application.

[0084] The above are only preferred embodiments of the present application and the technical principles used. The present application is not limited to the specific embodiments described herein, and various obvious changes, readjustments and substitutions that can be made by those skilled in the art will not deviate from the scope of protection of the present application. Therefore, although the present application is described in more detail through the above embodiments, the present application is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present application, and the scope of the present application is determined by the scope of the claims.

Claims

1. A synchronous rectifier control method for a digital resonant circuit, characterized in that: include: Determine the current difference between the two output currents of the digital power supply to the current resonant circuit, determine the loop voltage error value of the current resonant circuit according to the output voltage of the digital power supply to the current resonant circuit and the feedback voltage received by the digital power supply, and obtain the switching frequency of the synchronous rectifier tube of the current resonant circuit; When the current difference, the loop voltage error value and the switching frequency meet the set conditions, the synchronous rectifier tube of the current resonant circuit is turned off.

2. The synchronous rectifier control method of the digital resonant circuit according to claim 1, characterized in that: The current difference, the loop voltage error value and the switching frequency satisfy the set conditions, including: The current difference is greater than a set current threshold, the loop voltage error is less than a set voltage threshold, and the switching frequency is less than a set frequency.

3. The synchronous rectifier control method of the digital resonant circuit according to claim 1, characterized in that: The current difference, the loop voltage error value and the switching frequency satisfy the set conditions, including: A weighted score of the current difference, the loop voltage error value, and the switching frequency reaches a set score.

4. The synchronous rectifier control method of the digital resonant circuit according to any one of claims 1 to 3, characterized in that: After the synchronous rectifier of the current resonant circuit is turned off, the method further includes: After counting the set switching cycles, the synchronous rectifier tube of the current resonant circuit is turned on again.

5. The synchronous rectifier control method of the digital resonant circuit according to claim 4, characterized in that: The set switching period is set according to the duration of the current backflow of the synchronous rectifier tube of the current digital resonant circuit.

6. The synchronous rectifier control method of the digital resonant circuit according to claim 4, characterized in that: The synchronous rectifier tube for re-enabling the digital resonant circuit comprises: The synchronous rectifier tube of the digital resonant circuit is soft-started based on the set startup time.

7. The synchronous rectifier control method of the digital resonant circuit according to claim 4, characterized in that: After the synchronous rectifier tube of the current resonant circuit is reopened, the method further includes: The loop response parameter of the current resonant circuit is increased to increase the switching frequency.

8. A synchronous rectifier control device for a digital resonant circuit, characterized in that: include: A determination module is used to determine the current difference between the two output currents of the digital power supply to the current resonant circuit, determine the loop voltage error value of the current resonant circuit according to the output voltage of the digital power supply to the current resonant circuit and the feedback voltage received by the digital power supply, and obtain the switching frequency of the synchronous rectifier tube of the current resonant circuit; The control module is used to turn off the synchronous rectifier tube of the current resonant circuit when the current difference, the loop voltage error value and the switching frequency meet the set conditions.

9. An electronic device, characterized in that: include: memory and one or more processors; The memory is used to store one or more programs; When the one or more programs are executed by the one or more processors, the one or more processors implement the synchronous rectifier control method of the digital resonant circuit as described in any one of claims 1-7.

10. A storage medium containing computer executable instructions, characterized in that: The computer executable instructions are used to execute the synchronous rectifier control method of the digital resonant circuit as described in any one of claims 1-7 when executed by a computer processor.

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