Wave sending control method, device and equipment for intermittent mode of resonant converter

Abstract

The invention provides a resonant converter intermittent mode wave sending control method, device and equipment, and the method comprises the steps: determining whether to obtain a current to-be-judged sampling value or not according to a current timing value of a timer and a preset time threshold value, if yes, obtaining the to-be-judged sampling value, and if not, obtaining the to-be-judged sampling value; and judging whether the sampling value to be judged meets a first preset condition or not, controlling the resonant converter to send waves and stop timing the timer when the sampling value to be judged meets the first preset condition, re-controlling the timer to re-time when the sampling value to be judged does not meet the first preset condition, and stopping timing the timer when the current sampling value to be judged meets a second preset condition. And controlling the resonant converter to stop sending waves, resetting the current timing value, and controlling the timer to carry out timing again to obtain a new current timing value. According to the invention, the wave sending frequency of the resonant converter in the intermittent mode can be relatively fixed, and the stability of the system is improved.

Description

Technical Field

[0001] The present application relates to the field of circuit control technology, and in particular to a method, device and equipment for controlling wave generation in an intermittent mode of a resonant converter. Background Art

[0002] LLC resonant converter and bidirectional CLLC resonant converter are very effective DC-DC converters, which are often used in charging pile systems. According to their working principle and gain characteristics, the switching frequency will increase sharply when there is no load or light load output, thereby increasing the switching loss and affecting the efficiency. On the other hand, there will be a light load non-monotonic problem. This non-monotonic phenomenon will affect the regulation control of the loop for a simple frequency modulation control method.

[0003] In order to solve such problems, the method used in the prior art is to perform wave control in the intermittent mode of the resonant converter. Specifically, the intermittent mode is entered by judging whether the output voltage or current exceeds the judgment value, and the sampling voltage or current or loop output is judged in the intermittent mode to select wave generation and wave blocking after hysteresis judgment.

[0004] However, the prior art has the problem of random wave frequency in intermittent mode, which will cause common-mode interference and thus affect system stability. Summary of the invention

[0005] The purpose of the present application is to provide a method, device and equipment for controlling the intermittent mode of a resonant converter in order to address the deficiencies in the above-mentioned prior art, so as to solve the problem in the prior art that the frequency of the intermittent mode of the wave is random, which in turn causes common-mode interference and even affects the stability of the system.

[0006] To achieve the above objectives, the technical solutions adopted in this application are as follows: In a first aspect, the present application provides a method for controlling wave generation in an intermittent mode of a resonant converter, the method comprising: When the resonant converter enters the intermittent mode, the control timer starts timing and cyclically executes the following steps: A. acquiring the current timing value of the timer in real time, and determining whether to acquire the current sampling value to be determined according to the current timing value of the timer and a preset time threshold, wherein the sampling value to be determined includes: an output voltage sampling value or an output current sampling value; B. If yes, obtain the sample value to be determined, and determine whether the sample value to be determined meets the first preset condition; C. When the sample value to be determined meets the first preset condition, control the resonant converter to generate a wave, stop timing the timer, and continue to execute step E; D. When the sample value to be determined does not meet the first preset condition, re-control the timer to re-time and re-execute step A; E. Acquire the current sampling value to be judged of the resonant converter in real time, and when the current sampling value to be judged meets the second preset condition, control the resonant converter to stop emitting waves, reset the current timing value of the timer to the initial value, control the timer to re-time, and re-execute step A.

[0007] Optionally, after determining whether to obtain the current sample value to be determined, the method further includes: If it is determined that the current judgment sampling value is not to be obtained, the operating frequency of the resonant converter is adjusted to a preset operating frequency.

[0008] Optionally, determining whether to obtain the current sampling value to be determined according to the current timing value of the timer and a preset time threshold includes: If the current timing value is greater than or equal to the preset time threshold, it is determined to obtain the current sampling value to be determined.

[0009] Optionally, when the sample value to be determined satisfies a first preset condition, controlling the resonant converter to generate a wave comprises: If the output voltage sampling value is less than the preset voltage threshold, the ripple level of the resonant converter is increased to trigger the resonant converter to generate ripples.

[0010] Optionally, when the sample value to be determined satisfies a first preset condition, controlling the resonant converter to generate a wave comprises: If the output current sampling value is less than the preset current threshold, the ripple level of the resonant converter is increased to trigger the resonant converter to generate ripples.

[0011] Optionally, when the current sample value to be determined satisfies a second preset condition, controlling the resonant converter to stop emitting waves includes: If the output voltage sampling value is greater than or equal to the preset voltage threshold, the wave generation level of the resonant converter is lowered to trigger the resonant converter to stop generating waves.

[0012] Optionally, when the current sample value to be determined satisfies a second preset condition, controlling the resonant converter to stop emitting waves includes: If the output current sampling value is greater than or equal to the preset current threshold, the wave generation level of the resonant converter is lowered to trigger the resonant converter to stop generating waves.

[0013] In a second aspect, the present application provides a wave generation control device for an intermittent mode of a resonant converter, the device comprising: A first acquisition module is used to acquire the current timing value of the timer in real time, and determine whether to acquire the current sampling value to be judged according to the current timing value of the timer and a preset time threshold, wherein the sampling value to be judged includes: an output voltage sampling value or an output current sampling value; A second acquisition module, used to acquire the sample value to be determined, and determine whether the sample value to be determined meets a first preset condition; A first control module, configured to control the resonant converter to generate a wave and stop timing the timer when the sample value to be determined meets a first preset condition; A second control module, configured to re-control the timer to restart timing when the sample value to be determined does not meet the first preset condition; The third control module is used to obtain the current sampling value to be judged of the resonant converter in real time, and when the current sampling value to be judged meets the second preset condition, control the resonant converter to stop emitting waves, reset the current timing value of the timer to the initial value, and control the timer to restart timing.

[0014] Optionally, the first acquisition module is further used for: If it is determined that the current judgment sampling value is not to be obtained, the operating frequency of the resonant converter is adjusted to a preset operating frequency.

[0015] Optionally, the first acquisition module is further used for: If the current timing value is greater than or equal to the preset time threshold, it is determined to obtain the current sampling value to be determined.

[0016] Optionally, the first control module is specifically configured to: If the output voltage sampling value is less than the preset voltage threshold, the ripple level of the resonant converter is increased to trigger the resonant converter to generate ripples.

[0017] Optionally, the first control module is specifically configured to: If the output current sampling value is less than the preset current threshold, the ripple level of the resonant converter is increased to trigger the resonant converter to generate ripples.

[0018] Optionally, the third control module is specifically used to: If the output voltage sampling value is greater than or equal to the preset voltage threshold, the wave generation level of the resonant converter is lowered to trigger the resonant converter to stop generating waves.

[0019] Optionally, the third control module is specifically used to: If the output current sampling value is greater than or equal to the preset current threshold, the wave generation level of the resonant converter is lowered to trigger the resonant converter to stop generating waves.

[0020] In a third aspect, an embodiment of the present application further provides an electronic device, comprising: a processor, a storage medium and a bus, wherein the storage medium stores machine-readable instructions executable by the processor, and when the electronic device is running, the processor communicates with the storage medium through the bus, and the processor executes the machine-readable instructions to perform the steps of the intermittent mode wave control method of the resonant converter as described in any one of the first aspects.

[0021] In a fourth aspect, an embodiment of the present application further provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the steps of the method for controlling the intermittent mode of a resonant converter as described in any one of the first aspects are executed.

[0022] The beneficial effects of the present application are as follows: in the embodiment of the present application, by judging the current timing value and the preset time threshold, the periodic judgment of the sample value to be judged is realized, and further by judging whether the sample value to be judged meets the first preset condition or the second preset condition, the wave control and wave sealing control of the resonant converter in the intermittent mode are realized, and the time interval of each wave of the resonant converter in the intermittent mode can be made to be the preset time threshold or an integer multiple of the preset time threshold, so that the wave frequency of the resonant converter in the intermittent mode is relatively fixed. Therefore, in the subsequent steps, based on the characteristic of the fixed frequency of the wave, the EMC common mode interference can be filtered, thereby improving the stability of the system.

[0023] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, preferred embodiments are specifically cited below and described in detail with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 A schematic diagram showing an application scenario provided by an embodiment of the present application is shown; Figure 2 A flow chart showing a method for controlling the intermittent mode of a resonant converter provided in an embodiment of the present application is shown; Figure 3 An example diagram showing a change in voltage of a resonant converter during wave generation control provided by an embodiment of the present application is shown; Figure 4 The overall flow chart of a method for controlling the intermittent mode of a resonant converter provided in an embodiment of the present application is shown; Figure 5 A schematic structural diagram of a wave generation control device for an intermittent mode of a resonant converter provided in an embodiment of the present application is shown; Figure 6 A schematic structural diagram of an electronic device provided in an embodiment of the present application is shown. DETAILED DESCRIPTION

[0026] To make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. The components of the embodiments of the present application generally described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the application claimed for protection, but merely represents the selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without making creative work belong to the scope of protection of the present application.

[0027] It should be noted that the term "comprising" will be used in the embodiments of the present application to indicate the existence of the features declared thereafter, but does not exclude the addition of other features.

[0028] Currently, when controlling the wave generation in the intermittent mode of the resonant converter, the method adopted is to determine whether the output voltage or current exceeds the judgment value to determine whether to enter the intermittent mode, and to determine the sampling voltage or current or loop output in the intermittent mode for hysteresis judgment and then select the wave generation and the wave blocking.

[0029] In intermittent mode, the working cycle of the converter is divided into on-time and off-time, and the output voltage is changed by adjusting the ratio of these two times. When the wave is started, the resonant converter is in the on-time, and when the wave is stopped, the resonant converter is in the off-time. Exemplarily, after the resonant converter enters the intermittent mode, when the wave is stopped, the output voltage of the resonant converter will gradually decrease. In the intermittent mode, the output voltage of the resonant converter is judged in real time, and the wave is turned on when the output voltage is less than the preset value, and the intermittent mode is exited.

[0030] However, after the resonant converter stops oscillating, it will start oscillating as long as the output voltage is less than the preset value. However, since the voltage drop rate is not exactly the same, the starting frequency of the oscillating signal in the intermittent mode is random. Therefore, the EMC (Electro Magnetic Compatibility) common-mode interference caused is difficult to eliminate, which can easily cause interference to the system used by the resonant converter.

[0031] Based on this, the present application proposes a wave control method for the intermittent mode of a resonant converter, which makes a judgment based on the current timing value recorded by the timer, the output voltage of the resonant converter and a variety of judgment conditions, so that the wave frequency of the resonant converter in the intermittent mode is relatively fixed, and the EMC common mode interference caused is also relatively fixed, so that developers can filter the fixed EMC common mode interference, thereby improving the stability of the system.

[0032] Figure 1 is a schematic diagram of an application scenario provided in this application. Figure 1 The resonant converter is arranged in a conversion system, such as a charging conversion system, for realizing DC-DC voltage conversion. The resonant converter is connected to a controller. The controller can be arranged inside the resonant converter or connected to the control end of the resonant converter to control the resonant converter to start or stop emitting waves.

[0033] In one possible implementation, the controller may be an electronic device that obtains the real-time operating values ​​of the resonant converter, such as output voltage and output current, and performs logical judgment and control based on the method of the present application, and controls the resonant converter to start or stop emitting waves.

[0034] Next, combine Figure 2 , the wave control method of the intermittent mode of the resonant converter of the present application is described, such as Figure 2 As shown, the method includes: When the resonant converter enters the intermittent mode, the control timer starts timing and cyclically executes the following steps: S201. Acquire the current timing value of the timer in real time, and determine whether to acquire the current sampling value to be determined according to the current timing value of the timer and a preset time threshold, where the sampling value to be determined includes: an output voltage sampling value or an output current sampling value.

[0035] The resonant converter includes a timer, which is used to time the stop wave transmission time in the intermittent mode to obtain the current timing value. By comparing the current timing value with the preset time threshold, the periodic monitoring of the sample value to be judged can be realized, thereby realizing the wave transmission or wave blocking control with a fixed intermittent frequency. The preset time threshold can be 200us, for example.

[0036] The sampled value to be determined may be an output voltage sampled value of the resonant converter or an output current sampled value of the resonant converter.

[0037] Reference Figure 1 , the controller can obtain the current timing value of the timer in real time when the resonant converter enters the intermittent mode, and compare the current timing value with the preset time threshold to determine whether to obtain the current sampling value to be judged.

[0038] S202: If yes, obtain the sample value to be determined, and determine whether the sample value to be determined meets the first preset condition.

[0039] As a possible implementation manner, if the current timing value is greater than or equal to a preset time threshold, the sampling value to be determined can be obtained, and it is determined whether the sampling value to be determined meets the first preset condition.

[0040] Among them, the first preset condition may be that the sample value to be judged exceeds the threshold voltage or threshold current. Exemplarily, when the sample value to be judged is the output voltage sample value, the first preset condition may be that the sample value to be judged exceeds the threshold voltage, and when the sample value to be judged is the output current sample value, the first preset condition may be that the sample value to be judged exceeds the threshold current. The threshold voltage and threshold current can be designed based on actual design requirements.

[0041] It should be noted that the present application only uses the example that the current timing value is greater than or equal to the preset time threshold. It should be understood that it is also possible to determine whether to obtain the sampling value to be judged by performing calculations on the current timing value and the preset time threshold and judging the calculation results. For example, if the difference between the current timing value and the preset time threshold is greater than the preset value, the sampling value to be judged is obtained.

[0042] If the current timing value is determined to be less than the preset time threshold after judging the current timing value and the preset time threshold, the sampling value to be judged may not be obtained, and the timer continues to time and update the current timing value.

[0043] S203: When the sample value to be determined meets the first preset condition, control the resonant converter to generate waves, stop timing the timer, and continue to execute step S205.

[0044] The sampling value to be judged satisfies the first preset condition, which may be that the output voltage sampling value of the resonant converter satisfies the first preset condition, or the output current sampling value of the resonant converter satisfies the first preset condition.

[0045] Reference Figure 1When the controller obtains the current sampling value to be judged and determines that the sampling value to be judged meets the first preset condition, it can send a wave signal to the resonant converter to control the resonant converter to transmit waves, and send a stop timing signal to the timer to control the timer to stop timing, and continue to obtain the current sampling value to be judged of the resonant converter in real time, and when the sampling value to be judged meets the second preset condition, control the resonant converter to stop transmitting waves, and control the timer to reset the current timing value to the initial value.

[0046] S204: When the sample value to be determined does not satisfy the first preset condition, the timer is controlled to reset the timing and step S201 is executed again.

[0047] The sampling value to be determined does not satisfy the first preset condition, which may be that the output voltage sampling value of the resonant converter does not satisfy the first preset condition, or the output current sampling value of the resonant converter does not satisfy the first preset condition.

[0048] If the sampling value to be judged does not meet the first preset condition, it means that there is no need to emit waves at this time. At this time, the timer can be controlled to restart timing and return to the above step S201, and the step of determining whether it is necessary to obtain the current sampling value to be judged in real time according to the new current timing value recorded by the timer and the preset time threshold is re-executed until the sampling value to be judged meets the first preset condition, execute the above step S203, control the resonant converter to emit waves, stop the timer, and continue to execute the following step S205.

[0049] S205. Acquire the current sampling value to be judged of the resonant converter in real time, and when the current sampling value to be judged meets the second preset condition, control the resonant converter to stop emitting waves, reset the current timing value of the timer to the initial value, control the timer to re-time, and re-execute step S201.

[0050] The current sampled value to be determined satisfies the second preset condition, which may be that the current output voltage sampled value of the resonant converter satisfies the second preset condition, or the current output current sampled value of the resonant converter satisfies the second preset condition. As an example, the second preset condition may be that the current output voltage sampled value is greater than a threshold voltage or the current output current sampled value is greater than a threshold current.

[0051] Reference Figure 1 When the controller determines that the current sample value to be judged meets the second preset condition, the controller can send a stop signal to the resonant converter to stop the resonant converter from emitting waves, and send a reset signal to the timer to reset the current timing value to the initial value according to the reset signal and restart the timing. The initial value can be 0.

[0052] It should be noted that, in the entire intermittent mode, the resonant converter can implement the wave control of the resonant converter in the intermittent mode based on steps S201-S205 of the present application. Next, the process of wave control based on the method of the present application is described with examples, taking the sample value to be determined as the output voltage sample value as an example, Figure 3 The figure is a schematic diagram of the voltage change of the resonant converter when the wave control is performed based on the method of the present application in the intermittent mode, wherein the preset time threshold is represented as T1, the threshold voltage is represented as V0, the horizontal axis represents time, and the vertical axis represents voltage.

[0053] Reference Figure 3 When entering the intermittent mode, the timer starts timing, and when the current timing value t=T1 is determined at point A, the current output voltage sampling value V1 is obtained, and when the output voltage sampling value V1 meets the first preset condition, for example, when V1 is lower than the threshold voltage V0, the resonant converter is controlled to generate a wave, the timer is stopped, the current timing value t is maintained, and the current output voltage sampling value is continuously obtained in real time until Figure 3 The current output voltage sampling value V2 at point B shown meets the second preset condition, for example, when V2 exceeds the threshold voltage V0, the resonant converter is controlled to stop emitting waves, and the current timing value t is reset to 0, and the timer is controlled to restart timing to obtain a new current timing value.

[0054] It should be noted that after the wave generation stops, the output voltage sampling value will continue to decrease, and the rate of decrease may vary each time based on the actual working environment of the circuit device. Figure 3 When reaching point C, the new current timing value t is equal to T1, and the current output voltage sampling value V3 does not meet the second preset condition, that is, the output voltage sampling value V3 is greater than the threshold voltage V0. At this time, no wave is generated, and the timer is controlled to re-time. When the next timing cycle ends, it reaches Figure 3 Point D in the figure, that is, when the current timing value t is equal to T1, the current output voltage sampling value V4 continues to be judged whether it meets the second preset condition, referring to Figure 3 , the current output voltage sampling value V4 at point D is less than the threshold voltage V0, at this time, the above step S203 can be executed to control the resonant converter to generate waves and stop the timer.

[0055] It should be understood that the present application controls the wave generation of the resonant converter in the intermittent mode. Therefore, before the wave generation control of the resonant converter is performed based on the method of the present application, it should be determined that the resonant converter is in the intermittent mode. In the above steps S203-S205, each time before determining whether to obtain the sample value to be determined based on the current timing value and the preset time threshold, it is necessary to determine whether the resonant converter is in the intermittent mode. For example, the intermittent flag of the resonant converter can be read, and the wave generation control is performed by the method of the present application when the intermittent flag is "1". If the resonant converter is not in the intermittent mode, the wave generation control should be performed based on the frequency modulation wave generation mode.

[0056] In the embodiment of the present application, by judging the current timing value and the preset time threshold, the periodic judgment of the sample value to be judged is realized, and by further judging whether the sample value to be judged meets the first preset condition or the second preset condition, the wave control and wave sealing control of the resonant converter in the intermittent mode are realized, so that the time interval of each wave of the resonant converter in the intermittent mode is the preset time threshold or an integer multiple of the preset time threshold, so that the wave frequency of the resonant converter in the intermittent mode is relatively fixed. Therefore, in the subsequent steps, based on the characteristic of the wave having a fixed frequency, the EMC common mode interference can be filtered, thereby improving the stability of the system.

[0057] After determining whether to obtain the current sample value to be determined in the above step S201, the method further includes: If it is determined not to obtain the current judgment sampling value, the operating frequency of the resonant converter is adjusted to a preset operating frequency.

[0058] If the current timing value is less than the preset time threshold, the current judgment sampling value is not obtained, the timer continues to count, and the operating frequency of the resonant converter is adjusted to the preset operating frequency, where the preset operating frequency can be 250KHz.

[0059] Optionally, the process of determining whether to obtain the current sampling value to be determined according to the current timing value of the timer and the preset time threshold includes: If the current timing value is greater than or equal to the preset time threshold, it is determined to obtain the sampling value to be determined.

[0060] In a possible implementation, the current timing value may be compared with a preset time threshold in real time. If the current timing value is equal to or greater than the preset time threshold, the current sampling value to be determined of the resonant converter may be obtained.

[0061] In another possible implementation, the current timing value can be obtained at a preset frequency and compared with the preset time threshold. For example, the current timing value is obtained every 10us and compared with the preset time threshold. If the current timing value is equal to or greater than the preset time threshold, the sampling value to be judged can be obtained.

[0062] In the first implementation, the sampled value to be determined may be an output voltage sampled value. The process of controlling the resonant converter to generate a wave when the sampled value to be determined meets the first preset condition includes: If the output voltage sampling value is less than the preset voltage threshold, the ripple level of the resonant converter is increased to trigger the resonant converter to generate ripples.

[0063] By setting a preset voltage threshold, it can be ensured that the output voltage sampling value of the resonant converter is not too high frequency. The preset voltage threshold can be determined based on actual needs, and the specific value is not limited in this application.

[0064] After the output voltage sampling value is obtained, if the output voltage sampling value is less than the preset voltage threshold, the ripple level of the resonant converter can be increased to trigger the resonant converter to start ripple generation.

[0065] During the wave generation process of the resonant converter, the output voltage sampling value can be continuously judged. When it is determined that the output voltage sampling value is greater than the preset voltage threshold, the resonant converter is controlled to stop generating waves, the current timing value of the timer is reset to the initial value, and the timer is controlled to re-time. When the new current timing value is greater than or equal to the preset time threshold, it is continued to be determined based on the real-time output voltage sampling value whether it is necessary to control the resonant converter to start generating waves.

[0066] When the sampling value to be determined is the output voltage sampling value, when the current sampling value to be determined meets the second preset condition, the process of controlling the resonant converter to stop emitting waves includes: If the output voltage sampling value is greater than or equal to the preset voltage threshold, the wave generation level of the resonant converter is pulled down to trigger the resonant converter to stop generating waves.

[0067] When the output voltage sampling value is greater than or equal to the preset voltage threshold, in order to avoid high-frequency voltage from damaging other devices, it is necessary to stop the wave. Figure 1 The controller in the embodiment can send a stop waving signal to the resonant converter. When the resonant converter receives the stop waving signal, it lowers the waving level to stop waving.

[0068] In the second implementation, the sampled value to be determined may be an output current sampled value, and the process of controlling the resonant converter to generate a wave when the sampled value to be determined meets the first preset condition includes: If the output current sampling value is less than the preset current threshold, the ripple level of the resonant converter is increased to trigger the resonant converter to generate ripples.

[0069] After obtaining the current output current sampling value, the output current sampling value can be compared with the preset current threshold. If the output current sampling value is less than the preset current threshold, it means that the wave generation needs to be controlled at this time. Then the wave generation level of the resonant converter can be increased to trigger the resonant converter to start wave generation.

[0070] During the wave generation process of the resonant converter, the output current sampling value can be continuously judged. When it is determined that the output current sampling value is greater than the preset current threshold, the resonant converter is controlled to stop generating waves, the current timing value of the timer is reset to the initial value, and the timer is controlled to restart the timing. When the new current timing value is greater than or equal to the preset time threshold, it is continued to be determined based on the real-time output current sampling value whether it is necessary to control the resonant converter to start generating waves.

[0071] When the sampling value to be determined is the output current sampling value, when the current sampling value to be determined meets the second preset condition, the process of controlling the resonant converter to stop emitting waves includes: If the output current sampling value is greater than or equal to the preset current threshold, the wave generation level of the resonant converter is pulled down to trigger the resonant converter to stop generating waves.

[0072] When the output current sampling value is greater than or equal to the preset current threshold, in order to avoid damage to other devices, it is necessary to stop the wave. Figure 1 The controller in the embodiment can send a stop waving signal to the resonant converter. When the resonant converter receives the stop waving signal, it lowers the waving level to stop waving.

[0073] Next, combine Figure 4 The flowchart shown provides an overall description of the wave generation control method of the intermittent mode of the resonant converter of the present application.

[0074] Reference Figure 4 After determining that the resonant converter is in intermittent mode based on the intermittent flag, the current timing value of the timer can be obtained, and the current timing value can be compared with the preset time threshold T1 (the value of T1 can be 200us, for example). If the current timing value is less than the preset time threshold, no wave is generated, the operating frequency of the resonant converter is adjusted to the preset operating frequency (250KHz), and the timer continues to count. When the current timing value is equal to or greater than the preset time threshold, the sampling value to be judged, that is, the output voltage sampling value or the output current sampling value, is obtained, and whether to generate a wave is further determined based on whether the sampling value to be judged exceeds the preset threshold, that is, the preset voltage threshold or the preset current threshold.

[0075] If the output voltage sampling value is less than the preset voltage threshold, or the output current sampling value is less than the preset current threshold, the timer can be controlled to stop timing, keep the current timing value unchanged, and control the resonant converter to generate waves. In this process, the output voltage sampling value and the output current sampling value in the intermittent mode are continuously judged. When the output voltage sampling value is greater than or equal to the preset voltage threshold, or the output current sampling value is greater than or equal to the preset current threshold, the wave generation can be stopped, the current timing value is reset to 0, and the current timing value is judged again.

[0076] Based on the same inventive concept, the present application also provides a resonant converter intermittent mode wave control device corresponding to the resonant converter intermittent mode wave control method, which can be deployed in Figure 1 Since the principle of the device in the embodiment of the present application to solve the problem is similar to the above-mentioned wave generation control method of the resonant converter intermittent mode in the embodiment of the present application, the implementation of the device can refer to the implementation of the method, and the repeated parts will not be repeated.

[0077] Figure 5 The structure diagram of a resonant converter intermittent mode wave control device provided by an embodiment of the present application is shown. Figure 5 The device includes: a first acquisition module 501, a second acquisition module 502, a first control module 503, a second control module 504 and a third control module 503.

[0078] The first acquisition module 501 is used to acquire the current timing value of the timer in real time, and determine whether to acquire the current sampling value to be judged according to the current timing value of the timer and a preset time threshold, where the sampling value to be judged includes: an output voltage sampling value or an output current sampling value; The second acquisition module 502 is used to acquire the sample value to be determined, and determine whether the sample value to be determined meets the first preset condition; The first control module 503 is used to control the resonant converter to generate waves and stop timing the timer when the sample value to be determined meets the first preset condition; The second control module 504 is used to control the timer to restart timing when the sampling value to be judged does not meet the first preset condition; The third control module 505 is used to obtain the current sampling value to be judged of the resonant converter in real time, and when the current sampling value to be judged meets the second preset condition, control the resonant converter to stop emitting waves, reset the current timing value of the timer to the initial value, and control the timer to restart timing.

[0079] Optionally, the first acquisition module is further used for: If it is determined not to obtain the current judgment sampling value, the operating frequency of the resonant converter is adjusted to a preset operating frequency.

[0080] Optionally, the first acquisition module 501 is further used for: If the current timing value is greater than or equal to the preset time threshold, it is determined to obtain the current sampling value to be determined.

[0081] Optionally, the first control module 503 is specifically configured to: If the output voltage sampling value is less than the preset voltage threshold, the ripple level of the resonant converter is increased to trigger the resonant converter to generate ripples.

[0082] Optionally, the first control module 503 is specifically configured to: If the output current sampling value is less than the preset current threshold, the ripple level of the resonant converter is increased to trigger the resonant converter to generate ripples.

[0083] Optionally, the third control module 505 is specifically configured to: If the output voltage sampling value is greater than or equal to the preset voltage threshold, the wave generation level of the resonant converter is pulled down to trigger the resonant converter to stop generating waves.

[0084] Optionally, the third control module 505 is specifically configured to: If the output current sampling value is greater than or equal to the preset current threshold, the wave generation level of the resonant converter is pulled down to trigger the resonant converter to stop generating waves.

[0085] In the embodiment of the present application, by judging the current timing value and the preset time threshold, the periodic judgment of the sample value to be judged is realized, and by further judging whether the sample value to be judged meets the first preset condition or the second preset condition, the wave control and wave sealing control of the resonant converter in the intermittent mode are realized, so that the time interval of each wave of the resonant converter in the intermittent mode is the preset time threshold or an integer multiple of the preset time threshold, so that the wave frequency of the resonant converter in the intermittent mode is relatively fixed. Therefore, in the subsequent steps, based on the characteristic of the wave having a fixed frequency, the EMC common mode interference can be filtered, thereby improving the stability of the system.

[0086] Figure 6 A schematic diagram of the structure of an electronic device provided in an embodiment of the present application is shown. The electronic device may be Figure 1 , or with Figure 1The controller in the embodiment is communicated and connected, and the resonant converter is controlled by the controller to start or stop waving. The electronic device includes: a processor 601, a storage medium 602 and a bus 603, wherein the storage medium 602 stores machine-readable instructions executable by the processor 601. When the electronic device runs the waving control method of the intermittent mode of the resonant converter in the embodiment, the processor 601 communicates with the storage medium 602 through the bus 603, and the processor 601 executes the machine-readable instructions, and the preamble of the method item of the processor 601 executes the steps in the waving control method of the intermittent mode of the resonant converter.

[0087] An embodiment of the present application further provides a computer-readable storage medium having a computer program stored thereon. The computer program is executed when a processor is running, and the processor executes the steps in the above-mentioned method for controlling the generation of waves in the intermittent mode of the resonant converter.

[0088] In the embodiment of the present application, the computer program can also execute other machine-readable instructions when run by the processor to execute other methods described in the embodiment. For the specific execution method steps and principles, please refer to the description of the embodiment, which will not be repeated here.

[0089] In the embodiments provided in the present application, it should be understood that the disclosed devices and methods can be implemented in other ways. The device embodiments described above are merely schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some communication interfaces, and the indirect coupling or communication connection of the devices or units can be electrical, mechanical or other forms.

[0090] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0091] In addition, each functional unit in the embodiments provided in the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0092] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application, or the part that contributes to the prior art or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium, including several instructions for a computer device (which can be a personal computer, server, or network device, etc.) to execute all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk, and other media that can store program codes.

[0093] It should be noted that similar numbers and letters represent similar items in the following figures. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description and are not to be understood as indicating or implying relative importance.

[0094] Finally, it should be noted that the above-described embodiments are only specific implementation methods of the present application, which are used to illustrate the technical solutions of the present application, rather than to limit them. The protection scope of the present application is not limited thereto. Although the present application is described in detail with reference to the above-mentioned embodiments, ordinary technicians in the field should understand that any technician familiar with the technical field can still modify the technical solutions recorded in the above-mentioned embodiments within the technical scope disclosed in the present application, or can easily think of changes, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application. They should all be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A method for controlling the intermittent mode of a resonant converter, characterized in that: include: When the resonant converter enters the intermittent mode, the control timer starts timing and cyclically executes the following steps: A. acquiring the current timing value of the timer in real time, and determining whether to acquire the current sampling value to be determined according to the current timing value of the timer and a preset time threshold, wherein the sampling value to be determined includes: an output voltage sampling value or an output current sampling value; B. If yes, obtain the sample value to be determined, and determine whether the sample value to be determined meets the first preset condition; C. When the sample value to be determined satisfies the first preset condition, controlling the resonant converter to generate a wave, stopping timing of the timer, and continuing to execute step E; D. When the sample value to be determined does not meet the first preset condition, re-control the timer to re-time and re-execute step A; E. Acquire the current sampling value to be judged of the resonant converter in real time, and when the current sampling value to be judged meets the second preset condition, control the resonant converter to stop emitting waves, reset the current timing value of the timer to the initial value, control the timer to re-time, and re-execute step A.

2. The method according to claim 1, characterized in that After determining whether to obtain the current sample value to be determined, the method further includes: If it is determined that the current judgment sampling value is not to be obtained, the operating frequency of the resonant converter is adjusted to a preset operating frequency.

3. The method according to claim 1, characterized in that The step of determining whether to obtain a current sampling value to be determined based on a current timing value of the timer and a preset time threshold comprises: If the current timing value is greater than or equal to the preset time threshold, it is determined to obtain the current sampling value to be determined.

4. The method according to claim 1, characterized in that: When the sample value to be determined meets a first preset condition, controlling the resonant converter to generate a wave comprises: If the output voltage sampling value is less than the preset voltage threshold, the ripple level of the resonant converter is increased to trigger the resonant converter to generate ripples.

5. The method according to claim 1, characterized in that When the sample value to be determined meets a first preset condition, controlling the resonant converter to generate a wave comprises: If the output current sampling value is less than the preset current threshold, the ripple level of the resonant converter is increased to trigger the resonant converter to generate ripples.

6. The method according to claim 1, characterized in that When the current sample value to be determined satisfies a second preset condition, controlling the resonant converter to stop emitting waves comprises: If the output voltage sampling value is greater than or equal to the preset voltage threshold, the wave generation level of the resonant converter is lowered to trigger the resonant converter to stop generating waves.

7. The method according to claim 1, characterized in that When the current sample value to be determined satisfies a second preset condition, controlling the resonant converter to stop emitting waves comprises: If the output current sampling value is greater than or equal to the preset current threshold, the wave generation level of the resonant converter is lowered to trigger the resonant converter to stop generating waves.

8. A wave control device for an intermittent mode resonant converter, characterized in that: include: A first acquisition module is used to acquire the current timing value of the timer in real time, and determine whether to acquire the current sampling value to be judged according to the current timing value of the timer and a preset time threshold, wherein the sampling value to be judged includes: an output voltage sampling value or an output current sampling value; A second acquisition module, used to acquire the sample value to be determined, and determine whether the sample value to be determined meets a first preset condition; A first control module, configured to control the resonant converter to generate a wave and stop timing the timer when the sample value to be determined meets a first preset condition; A second control module, configured to re-control the timer to restart timing when the sample value to be determined does not meet the first preset condition; The third control module is used to obtain the current sampling value to be judged of the resonant converter in real time, and when the current sampling value to be judged meets the second preset condition, control the resonant converter to stop emitting waves, reset the current timing value of the timer to the initial value, and control the timer to restart timing.

9. An electronic device, characterized in that: include: A processor, a storage medium and a bus, wherein the storage medium stores machine-readable instructions executable by the processor, and when the electronic device is running, the processor communicates with the storage medium through the bus, and the processor executes the machine-readable instructions to perform the steps of the wave generation control method of the intermittent mode of the resonant converter as described in any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps of the method for controlling the intermittent mode of a resonant converter according to any one of claims 1 to 7 are executed.

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