Voltage stress detection circuit and method, electric energy conversion circuit and electronic equipment

Abstract

The invention discloses a voltage stress detection circuit and method, an electric energy conversion circuit and electronic equipment, and the circuit comprises a charging adjustment circuit which is used for being coupled with a switching tube; the first energy storage circuit is coupled with the charging adjusting circuit and is used for being coupled with the main control circuit; wherein the charging regulation circuit is configured to obtain a switching voltage signal of the switching tube, and store energy for the first energy storage circuit by using the switching voltage signal; the first energy storage circuit is configured to output the current first energy storage voltage to the main control circuit, so that the main control circuit adjusts a driving control signal sent to the switching tube in response to the first energy storage voltage. By means of the mode, the voltage stress detection circuit can monitor the voltage stress of the switch tube in the switch adjusting circuit in real time, effectively prevents the voltage stress from exceeding the standard by adjusting the driving control signal output to the switch tube in time, and facilitates product reliability analysis and improvement through recording.

Description

Technical Field

[0001] The present application relates to the technical field of circuit signal processing, and in particular to a voltage stress detection circuit and method, an electric energy conversion circuit, and an electronic device. Background Art

[0002] Nowadays, with the increasing variety of electronic mechanical products on the market, various types of signal function circuits are becoming more and more complex, and power semiconductors are usually an indispensable and important component. In the circuit design stage of related products, the voltage stress, current stress, power consumption, etc. of power semiconductors need to be carefully calculated. Even in the subsequent product debugging stage, comprehensive testing and repeated optimization of parameters are required to ensure that the stress of the semiconductor does not exceed the limit. Especially voltage stress, when the power tube is switched, a huge voltage spike can be generated at both ends. If effective measures are not taken, once the instantaneous voltage stress exceeds the rated voltage value, it is easy to break down the power tube, causing irreversible failure or even burning.

[0003] In order to suppress the voltage stress of power semiconductors, a voltage spike absorption circuit is generally added to the power tube. This measure is very effective in improving the voltage stress problem under known working conditions. However, the voltage spike absorption circuit is a passive effect after all, and it is often still stretched in some unknown extreme conditions. Moreover, the voltage spike absorption circuit is tested based on the known working conditions of the circuit, and the suppression of the voltage stress under the known working conditions is based on the test results. However, in mass production applications, when the circuit parameters are abnormal or there are other unknown working conditions, it is often unknown whether the voltage stress meets the requirements. When the device is severely damaged, it is basically difficult to analyze whether the device is damaged by voltage stress, and it is even more impossible to determine whether there is voltage stress abnormality when the circuit is used, which is not conducive to improving product quality and improving product design solutions. Summary of the invention

[0004] The main technical problem solved by the present application is to provide a voltage stress detection circuit and method, an electric energy conversion circuit, and an electronic device, which can solve the problem that the voltage spike absorption circuit in the prior art cannot effectively improve the voltage stress problem when the circuit parameters are abnormal or there are other unknown working conditions, and cannot effectively deal with some unknown extreme conditions. When the device is severely damaged, it is impossible to analyze whether the device is damaged by voltage stress, and it is even more impossible to determine whether there is voltage stress abnormality when the circuit is used, which is not conducive to improving product quality and improving product design solutions.

[0005] In order to solve the above technical problems, a technical solution adopted in the present application is: to provide a voltage stress detection circuit, which is applied to voltage stress detection of a switching regulation circuit, the switching regulation circuit includes a main control circuit and a switching tube controlled by the main control circuit, wherein the voltage stress detection circuit includes: a charging regulation circuit, which is used to couple with the switching tube; a first energy storage circuit, which is coupled to the charging regulation circuit and is used to couple with the main control circuit; wherein the charging regulation circuit is configured to obtain a switching voltage signal of the switching tube, and use the switching voltage signal to store energy in the first energy storage circuit; the first energy storage circuit is configured to output its current first energy storage voltage to the main control circuit, so that the main control circuit adjusts the driving control signal sent to the switching tube in response to the first energy storage voltage.

[0006] Among them, the voltage stress detection circuit also includes a voltage divider regulation circuit and a second energy storage circuit, the voltage divider regulation circuit couples the first energy storage circuit and the second energy storage circuit, and the second energy storage circuit is used to couple with the main control circuit; wherein, the voltage divider regulation circuit is configured to receive the first energy storage voltage of the first energy storage circuit to perform voltage division regulation on the first energy storage voltage, and use the first energy storage voltage after voltage division regulation to store energy in the second energy storage circuit; the second energy storage circuit is configured to output its current second energy storage voltage to the main control circuit, so that the main control circuit responds to the second energy storage voltage regulation drive control signal.

[0007] Wherein, the voltage stress detection circuit further includes a signal processing circuit, the signal processing circuit is coupled to the second energy storage circuit and is used to couple to the main control circuit; Wherein, the signal processing circuit is configured to receive the second energy storage voltage of the second energy storage circuit, to compare the second energy storage voltage with the first preset threshold value and the second preset threshold value respectively to obtain a first comparison result and a second comparison result, and to send a first warning signal or a second warning signal to the main control circuit in response to the first comparison result and the second comparison result, so that the main control circuit reduces the duty cycle or signal frequency of the drive control signal in response to the first warning signal, or stops sending the drive control signal in response to the second warning signal; wherein, the first preset threshold value is less than the second preset threshold value.

[0008] Among them, the voltage stress detection circuit also includes a signal processing circuit, which is coupled to the second energy storage circuit and is used to couple with the main control circuit; wherein the signal processing circuit is configured to receive the second energy storage voltage of the second energy storage circuit, and use a set function to calculate the second energy storage voltage to obtain the first energy storage voltage, so as to compare the calculated first energy storage voltage with the third preset threshold to obtain a third comparison result, and in response to the third comparison result, send a voltage feedback signal or a third early warning signal to the main control circuit, so that the main control circuit responds to the voltage feedback signal to send the drive control signal normally, or responds to the third early warning signal to reduce the duty cycle or signal frequency of the drive control signal, or stop sending the drive control signal.

[0009] Among them, the voltage stress detection circuit also includes a filtering circuit, which is coupled to the second energy storage circuit and is used to couple with the main control circuit; the filtering circuit is configured to receive the second energy storage voltage of the second energy storage circuit, and after filtering and adjusting the second energy storage voltage, output it to the main control circuit, so that the main control circuit responds to the second energy storage voltage after filtering and adjustment to adjust the drive control signal.

[0010] Among them, the voltage stress detection circuit also includes an isolation circuit, which is coupled to the second energy storage circuit and used to couple with the main control circuit; the isolation circuit is configured to receive the second energy storage voltage of the second energy storage circuit, and after isolating and adjusting the second energy storage voltage, output it to the main control circuit, so that the main control circuit responds to the second energy storage voltage after isolation and adjustment to adjust the drive control signal.

[0011] The voltage stress detection circuit further includes a differential input isolation operational amplifier circuit, which is coupled to the isolation circuit. The isolation circuit is used to cooperate with the differential input isolation operational amplifier circuit to isolate and adjust the second energy storage voltage.

[0012] Among them, the charging regulation circuit includes a first diode and a first resistor, the first energy storage circuit includes a first capacitor, the voltage divider regulation circuit includes a second resistor, a third resistor and a second diode, and the second energy storage circuit includes a second capacitor; wherein, the first end of the first diode is used to couple with the switch tube, the second end of the first diode is coupled to the first end of the first resistor, the second end of the first resistor is coupled to the first end of the first capacitor and the first end of the second resistor, the second end of the first capacitor is coupled to the second end of the third resistor, the second end of the second capacitor and grounded, the second end of the second resistor is coupled to the first end of the third resistor and the first end of the second diode, the second end of the second diode is coupled to the first end of the second capacitor, and is used to couple with the main control circuit.

[0013] Among them, the voltage stress detection circuit also includes a gating circuit, the number of switching tubes and charging regulation circuits is equal, and there are at least two, the gating circuit is coupled to each charging regulation circuit, and is used to couple with each switching tube, and each switching tube is coupled to its corresponding charging regulation circuit in a cycle and alternately at each interval set time.

[0014] In order to solve the above technical problems, another technical solution adopted in the present application is: to provide a voltage stress detection method, wherein the voltage stress detection method includes: obtaining a switching voltage signal of a switching tube; obtaining a first energy storage voltage using the switching voltage signal; and outputting the first energy storage voltage to a main control circuit, so that the main control circuit adjusts a driving control signal sent to the switching tube in response to the first energy storage voltage.

[0015] Among them, after the step of obtaining the first energy storage voltage by using the switching voltage signal, before the step of outputting the first energy storage voltage to the main control circuit so that the main control circuit responds to the first energy storage voltage to adjust the driving control signal sent to the switching tube, it also includes: dividing the first energy storage voltage and adjusting the first energy storage voltage; obtaining the second energy storage voltage by using the first energy storage voltage after voltage division adjustment; the step of outputting the first energy storage voltage to the main control circuit so that the main control circuit responds to the first energy storage voltage to adjust the driving control signal sent to the switching tube includes: outputting the second energy storage voltage to the main control circuit so that the main control circuit responds to the second energy storage voltage to adjust the driving control signal sent to the switching tube.

[0016] Among them, after the step of obtaining the second energy storage voltage by using the first energy storage voltage after voltage division adjustment, before the step of outputting the second energy storage voltage to the main control circuit so that the main control circuit responds to the second energy storage voltage to adjust the driving control signal sent to the switch tube, it also includes: detecting whether the second energy storage voltage is greater than the first preset threshold; if the second energy storage voltage is greater than the first preset threshold, detecting whether the second energy storage voltage is greater than the second preset threshold; the step of outputting the second energy storage voltage to the main control circuit so that the main control circuit responds to the second energy storage voltage to adjust the driving control signal sent to the switch tube includes: if the second energy storage voltage is not greater than the second preset threshold, sending a first early warning signal to the main control circuit so that the main control circuit reduces the duty cycle or signal frequency of the driving control signal in response to the first early warning signal; if the second energy storage voltage is greater than the second preset threshold, sending a second early warning signal to the main control circuit so that the main control circuit stops sending the driving control signal in response to the second early warning signal.

[0017] Among them, after the step of obtaining the second energy storage voltage by using the first energy storage voltage after voltage division adjustment, before the step of outputting the second energy storage voltage to the main control circuit so that the main control circuit responds to the second energy storage voltage to adjust the driving control signal sent to the switching tube, it also includes: using a set function to calculate the first energy storage voltage from the second energy storage voltage; detecting whether the calculated first energy storage voltage is greater than a third preset threshold; the step of outputting the second energy storage voltage to the main control circuit so that the main control circuit responds to the second energy storage voltage to adjust the driving control signal sent to the switching tube includes: if the calculated first energy storage voltage is greater than the third preset threshold, sending a third early warning signal to the main control circuit, so that the main control circuit reduces the duty cycle or signal frequency of the driving control signal in response to the third early warning signal, or stops sending the driving control signal.

[0018] In order to solve the above technical problems, another technical solution adopted in the present application is: to provide an electric energy conversion circuit, wherein the electric energy conversion circuit includes a switching regulation circuit and a voltage stress detection circuit coupled to each other; wherein the voltage stress detection circuit is a voltage stress detection circuit as described in any of the above items.

[0019] In order to solve the above technical problems, another technical solution adopted in the present application is: to provide an electronic device, wherein the electronic device includes a shell and a signal function circuit connected to the shell; wherein the signal function circuit is a voltage stress detection circuit as described in any of the above items, or an electric energy conversion circuit as described above.

[0020] The beneficial effects of the present application are as follows: Different from the prior art, the charging regulation circuit in the voltage stress detection circuit provided by the present application is used to couple with the switch tube in the switch regulation circuit, and the first energy storage circuit is coupled with the charging regulation circuit and is used to couple with the main control circuit in the switch regulation circuit; wherein the charging regulation circuit is configured to obtain the switch voltage signal of the switch tube, and use the switch voltage signal to store energy in the first energy storage circuit; the first energy storage circuit is configured to output its current first energy storage voltage to the main control circuit, so that the main control circuit adjusts the driving control signal sent to the switch tube in response to the first energy storage voltage, thereby being able to effectively control the switch tube in the switch regulation circuit. The voltage stress can be monitored in real time, and when abnormal voltage stress is detected, the drive control signal output to the switch tube can be adjusted in time to avoid excessive power consumption of the switch tube, affecting its life, or even irreversible failure or burning, thereby effectively avoiding voltage stress exceeding the standard. When the voltage stress is too high, the event can be recorded, which is also helpful for product reliability analysis and improvement. Regardless of whether the switch regulation circuit is in a known working condition, or whether the circuit parameters are abnormal or in other unknown working conditions, it can effectively monitor whether the voltage stress is abnormal and take effective measures to help improve product quality and product design solutions. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative work, among which: Figure 1 It is a structural schematic diagram of a first implementation mode of a voltage stress detection circuit of the present application; Figure 2 It is a structural schematic diagram of a second embodiment of the voltage stress detection circuit of the present application; Figure 3 yes Figure 2 A schematic structural diagram of an embodiment of a switching regulation circuit; Figure 4 yes Figure 3 A schematic diagram of the waveform of the switch voltage signal of each switch tube in the switch regulation circuit; Figure 5 is a structural schematic diagram of a third embodiment of the voltage stress detection circuit of the present application; Figure 6 is a structural schematic diagram of a fourth embodiment of the voltage stress detection circuit of the present application; Figure 7 is a structural schematic diagram of a fifth embodiment of the voltage stress detection circuit of the present application; Figure 8 is a structural schematic diagram of a sixth embodiment of the voltage stress detection circuit of the present application; Fig. 9 is a structural schematic diagram of a seventh implementation mode of the voltage stress detection circuit of the present application; Fig.10 It is a flow chart of the first implementation method of the voltage stress detection method of the present application; Fig.11 It is a flow chart of the second implementation method of the voltage stress detection method of the present application; Fig.12 is a flow chart of a third implementation method of the voltage stress detection method of the present application; Fig.13 is a flow chart of a fourth implementation method of the voltage stress detection method of the present application; Fig.14 It is a structural schematic diagram of an implementation method of the electric energy conversion circuit of the present application; Fig.15 It is a schematic structural diagram of an embodiment of an electronic device of the present application. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0023] The terms "first", "second" and "third" in this application are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Thus, the features defined as "first", "second" and "third" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined. All directional indications (such as up, down, left, right, front, back...) in the implementation mode of this application are only used to explain the relative position relationship, movement, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication also changes accordingly. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but optionally also includes steps or units that are not listed, or optionally also includes other steps or units inherent to these processes, methods, products or devices.

[0024] Reference to "embodiment" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0025] The present application is described in detail below with reference to the accompanying drawings and implementation methods.

[0026] See also Figure 1 , Figure 1 1 is a schematic diagram of the structure of the first embodiment of the voltage stress detection circuit of the present application. In this embodiment, the voltage stress detection circuit 10 specifically includes a charging regulation circuit 11 and a first energy storage circuit 12.

[0027] Among them, a voltage stress detection circuit 10 provided in the present application is specifically applied to voltage stress detection of power semiconductor devices, so as to monitor the switch voltage signal of the switch tube 202 in the switch regulation circuit 200 in real time, and perform feedback regulation on the switch tube 202 in response to possible voltage stress anomalies, so as to effectively avoid excessive power consumption of the switch tube 202, affect the life, and even cause irreversible failure and burning. Of course, in other embodiments, the voltage stress detection circuit 10 can also be specifically used in voltage stress detection of totem pole conversion circuits, boost conversion circuits, buck conversion circuits or any other reasonable signal function circuits integrated with power semiconductor devices, and this embodiment does not limit this.

[0028] Specifically, the switch regulation circuit 200 includes a main control circuit 201 and at least one switch tube 202 coupled to the main control circuit 201. Each switch tube 202 is controlled by the main control circuit 201, and the main control circuit 201 can specifically change the switching state of the switch tube 202 by adjusting the driving control signal output to the switch tube 202, thereby adjusting the output voltage and / or output current of each circuit unit composed of each switch tube 202, and at the same time adjusting the switching power of each switch tube 202, or performing wave blocking protection on each switch tube 202.

[0029] In some embodiments, the switch tube 202 can specifically be any reasonable power semiconductor device such as MOS (Metal Oxide Semiconductor Field Effect Transistor), high-frequency transistor, triode, thyristor, IGBT (Insulated Gate Bipolar Transistor), etc., and this application does not limit this.

[0030] In some embodiments, the main control circuit 201 may specifically include a control chip, an MCU (Micro Controller Unit) circuit, a CPU (Central Processing Unit), a DSP (Digital Signal Processing), a single-chip microcomputer, a field programmable gate array, a programmable logic device, a discrete gate or transistor logic device, discrete hardware, and any other reasonable circuit units with signal processing functions, and the present application does not limit this.

[0031] In some embodiments, the drive control signal may specifically be one or more of any reasonable control signals such as a PWM (Pulse Width Modulation) signal or a PFM (Pulse Frequency Modulation) signal, and the present application does not limit this.

[0032] It is worth noting that the first end of the switch tube 202 is the control end, and when the first end of the switch tube 202 receives a corresponding driving control signal sent by the main control circuit 201, it can trigger the second end and the third end to be turned on or off in response to the driving control signal.

[0033] In addition, the term "coupled" herein refers to any direct and indirect connection means. Therefore, if the first circuit is described as being coupled to the second circuit, it means that the first circuit can be directly connected to the second circuit through electrical connection or signal connection methods such as wireless transmission, optical transmission, etc., or can be indirectly connected to the second circuit through other circuits or connection means.

[0034] The charging regulation circuit 11 is used to couple with the switch tube 202 , and specifically can be connected to the second end and / or the third end of the switch tube 202 to obtain the switching voltage signal of the second end and the third end of the switch tube 202 .

[0035] The first energy storage circuit 12 is coupled after the charge regulating circuit 11 and connected to the main control circuit 201 , and is used for storing the electric energy from the charge regulating circuit 11 and converting it into a first energy storage voltage that can be read by the main control circuit 201 .

[0036] Among them, the charging regulation circuit 11 is used to obtain the switching voltage signal of the switching tube 202, and use the switching voltage signal to start charging the first energy storage circuit 12. The first energy storage circuit 12 gradually accumulates energy, and its voltage level, that is, the first energy storage voltage, reflects the maximum voltage stress in the most recent switching event.

[0037] The main control circuit 201 detects and reads the first energy storage voltage, and accordingly evaluates the current working state of the switch tube 202, and determines whether it is necessary to adjust the driving control signal sent to the switch tube 202 according to a preset safety threshold.

[0038] If the main control circuit 201 detects that the first energy storage voltage exceeds the set safety range, it indicates that the switch tube 202 is subjected to excessive voltage stress, and the main control circuit 201 can take measures to reduce the load, power, slow down the switching speed, or temporarily stop the switching operation, such as reducing the duty cycle and / or signal frequency of the drive control signal sent to the switch tube 202, or directly blocking the drive control signal, that is, not sending the drive control signal to the switch tube 202, to protect the switch tube 202 from damage. On the contrary, if it is detected that the first energy storage voltage is within the safety range, the main control circuit 201 can maintain a normal drive control strategy.

[0039] It is understandable that the voltage stress detection circuit 10 can effectively monitor and record the voltage stress of the corresponding switch tube 202, and quickly feed back to the main control circuit 201, thereby realizing real-time monitoring of voltage stress. And by accurately measuring the transient voltage changes at both ends of the switch tube 202, the accuracy of the voltage stress assessment is ensured. The entire detection process does not interfere with the normal operation of the original switch regulation circuit 200, avoiding the introduction of additional noise or errors. The main control circuit 201 can flexibly adjust the drive control strategy according to actual needs, thereby improving the adaptability and reliability of the system. Compared with complex external monitoring equipment, this built-in voltage stress detection solution has a simple structure, is easy to integrate, and reduces the overall system cost. Application scenario This voltage stress detection circuit 10 is particularly suitable for various switch regulation circuits 200, especially those applications that have strict requirements on power semiconductor devices, such as motor drivers, on-board chargers, and DC-DC (Direct Current) converters for new energy vehicles. By introducing such a circuit, not only can the power device be effectively prevented from failing due to excessive voltage stress, but also valuable data support can be provided for subsequent product reliability analysis. In summary, the voltage stress detection circuit 10 realizes efficient and accurate monitoring of the voltage stress of the switch tube 202 through the cooperation of the charging regulation circuit 11 and the first energy storage circuit 12. It not only helps to improve the overall performance and reliability of the switch regulation circuit 200, but also provides a solid foundation for future intelligent control and fault diagnosis.

[0040] The above scheme monitors the voltage stress of the switch tube 202 in the switch regulation circuit 200 in real time, and when abnormal voltage stress is detected, the drive control signal output to the switch tube 202 can be adjusted in time to avoid excessive power consumption of the switch tube 202, affecting its life, or even causing irreversible failure or burning, thereby effectively avoiding voltage stress exceeding the standard, and recording this event when the voltage stress is too high, which is also helpful for product reliability analysis and improvement; and regardless of whether the switch regulation circuit 200 is in a known working condition, or whether the circuit parameters are abnormal or in other unknown working conditions, it is possible to effectively monitor whether the voltage stress is abnormal and take effective measures to help improve product quality and product design solutions.

[0041] See also Figure 2 , Figure 2 The voltage stress detection circuit in this embodiment differs from the first embodiment of the voltage stress detection circuit provided in this application in that the voltage stress detection circuit 20 specifically further includes a voltage divider adjustment circuit 23 and a second energy storage circuit 24.

[0042] The voltage division regulating circuit 23 is coupled between the first energy storage circuit 22 and the second energy storage circuit 24 . The second energy storage circuit 24 is coupled after the voltage division regulating circuit 23 and connected to the main control circuit 201 .

[0043] Among them, the voltage divider regulation circuit 23 is used to receive the first energy storage voltage of the first energy storage circuit 22 and perform voltage division regulation on it, and specifically can reduce the amplitude of the first energy storage voltage according to a preset ratio or dynamic adjustment strategy to ensure that the voltage transmitted to the main control circuit 201 is within a safe range, avoiding excessive voltage from causing damage to the main control circuit 201; and the voltage after voltage division regulation will be transmitted to the second energy storage circuit 24 for energy storage.

[0044] The second energy storage circuit 24 receives and stores the first energy storage voltage after voltage division and adjustment, and gradually accumulates energy. Its voltage level, that is, the second energy storage voltage, reflects the voltage stress of the switch tube 202 .

[0045] The main control circuit 201 detects and reads the second energy storage voltage, and accordingly evaluates the current working state of the switch tube 202 to determine whether the driving control signal sent to the switch tube 202 needs to be adjusted according to a preset safety threshold.

[0046] If the main control circuit 201 detects that the second energy storage voltage exceeds the set safety range, it indicates that the switch tube 202 is subjected to excessive voltage stress, and the main control circuit 201 can take measures to reduce the load, slow down the switching speed, or temporarily stop the switching operation to protect the switch tube 202 from damage. On the contrary, if it is detected that the second energy storage voltage is within the safety range, the main control circuit 201 can maintain a normal drive control strategy.

[0047] It is worth noting that the main control circuit 201 has different safety ranges of voltage stress corresponding to the driving control strategies set based on the first energy storage voltage and the second energy storage voltage. And because the second energy storage voltage is obtained by voltage division adjustment of the first energy storage voltage, the second energy storage voltage and the first energy storage voltage will satisfy a specific functional relationship; accordingly, the safety ranges of voltage stress corresponding to the first energy storage voltage and the second energy storage voltage respectively also satisfy a specific functional relationship.

[0048] It is understandable that the two-stage energy storage mechanism of the first energy storage circuit 22 and the second energy storage circuit 24 realizes multi-level monitoring and protection of the voltage stress of the switch tube 202. The voltage division adjustment circuit 23 ensures that the voltage transmitted to the main control circuit 201 is within a safe range, avoiding the potential threat of direct high voltage to the main control circuit 201. The voltage signal after voltage division adjustment is more stable and accurate, which helps to improve the accuracy and stability of voltage stress assessment.

[0049] In some embodiments, the voltage stress detection circuit 20 further includes a signal processing circuit 26, which is coupled to the second energy storage circuit 24 and connected to the main control circuit 201. The signal processing circuit 26 is used to receive the second energy storage voltage of the second energy storage circuit 24, and compare it with a preset threshold value to generate a corresponding warning signal.

[0050] Specifically, the signal processing circuit 26 compares the second energy storage voltage with the first preset threshold and the second preset threshold, respectively, to obtain a first comparison result and a second comparison result. If the signal processing circuit 26 detects that the second energy storage voltage exceeds the first preset threshold but does not exceed the second preset threshold, the first comparison result is triggered, and the signal processing circuit 26 sends a first warning signal to the main control circuit 201; and if the second energy storage voltage is detected to exceed the second preset threshold, the second comparison result is triggered, and the signal processing circuit 26 sends a second warning signal to the main control circuit 201.

[0051] After receiving the first warning signal, the main control circuit 201 takes preventive measures, such as reducing the duty cycle of the drive control signal or lowering the signal frequency to reduce the voltage stress of the switch tube 202; and after receiving the second warning signal, it immediately stops sending the drive control signal to prevent the switch tube 202 from being damaged due to excessive voltage stress.

[0052] It is worth noting that the first preset threshold is smaller than the second preset threshold, which can be understood as a lower safety threshold, indicating a slight voltage stress exceeding the standard; while the second preset threshold is a higher danger threshold, indicating a serious voltage stress exceeding the standard.

[0053] In other embodiments, the signal processing circuit 26 may further be configured with a greater number of preset thresholds. For example, the first preset threshold may further be configured with at least two thresholds of different sizes, so as to perform more detailed feedback adjustments on different voltage stress exceeding conditions in a graded manner, that is, to grade the duty cycle of the drive control signal or reduce the signal frequency to adjust and control the signal, which is not limited in the present application.

[0054] In other embodiments, when the signal processing circuit 26 detects that the second energy storage voltage is less than the first preset threshold, it may not send a signal to the main control circuit 201, or may send a voltage feedback signal to the main control circuit 201 for sampling and recording, but does not adjust the current drive control signal. This application does not limit this.

[0055] In other embodiments, the signal processing circuit 26 may be specifically integrated into the main control circuit 201, or the signal processing function corresponding to the signal processing circuit 26 may be specifically executed by the main control circuit 201, which is not limited in the present application.

[0056] It is understandable that by setting different preset thresholds, intelligent identification and response to voltage stress exceeding the standard at different levels are achieved, thereby improving the safety of the system. The first warning signal allows the system to take mild protection measures at an early stage, while the second warning signal provides stricter protection to ensure that the switch tube 202 is not damaged by extreme conditions. Through the coordinated work of the charging regulation circuit 21, the first energy storage circuit 22, the voltage division regulation circuit 23, the second energy storage circuit 24 and the signal processing circuit 26, efficient and accurate monitoring and intelligent warning of the voltage stress of the switch tube 202 are achieved.

[0057] In other embodiments, the voltage stress detection circuit 20 further includes a signal processing circuit 26, which is coupled to the second energy storage circuit 24 and connected to the main control circuit 201. The signal processing circuit 26 can also receive the second energy storage voltage of the second energy storage circuit 24, and calculate the first energy storage voltage using the second energy storage voltage, so as to compare the calculated first energy storage voltage with a preset threshold value and generate a corresponding warning signal.

[0058] Specifically, the signal processing circuit 26 calculates the first energy storage voltage from the second energy storage voltage using a set function, and compares the calculated first energy storage voltage with a third preset threshold value to obtain a third comparison result. If the signal processing circuit 26 detects that the calculated first energy storage voltage does not exceed the third preset threshold value, a voltage feedback signal is sent to the main control circuit 201; and if the signal processing circuit 26 detects that the calculated first energy storage voltage exceeds the third preset threshold value, a third warning signal is sent to the main control circuit 201.

[0059] When the main control circuit 201 receives the voltage feedback signal, it sends the driving control signal normally, that is, it does not change the driving control signal currently sent to the switch tube 202. When receiving the third warning signal, it reduces the duty cycle or signal frequency of the driving control signal to reduce the voltage stress of the switch tube 202; or immediately stops sending the driving control signal to prevent the switch tube 202 from being damaged due to excessive voltage stress.

[0060] Similarly, by setting different preset thresholds, intelligent identification and response to voltage stress exceeding the standard at different levels are achieved, thereby improving the safety of the system. The third warning signal allows the system to take mild protection measures in the early stage, while the fourth warning signal provides stricter protection to ensure that the switch tube 202 will not be damaged by extreme conditions. Moreover, the calculated first energy storage voltage directly reflects the voltage stress of the switch tube 202, so that the voltage stress change of the switch tube 202 can be more intuitively reflected when detecting and recording the calculated first energy storage voltage, and the second energy storage circuit 24 can also be used to achieve more stable and accurate voltage stress evaluation and feedback regulation. Through the coordinated work of the charging regulation circuit 21, the first energy storage circuit 22, the voltage divider regulation circuit 23, the second energy storage circuit 24 and the signal processing circuit 26, efficient and accurate monitoring and intelligent warning of the voltage stress of the switch tube 202 are achieved.

[0061] In other embodiments, the signal processing circuit 26 may also compare the calculated first energy storage voltage with a fourth preset threshold value to obtain a fourth comparison result. The fourth preset threshold value is greater than the third preset threshold value, so that when it is detected that the calculated first energy storage voltage exceeds the fourth preset threshold value, a fourth warning signal is sent to the main control circuit 201, so that the main control circuit 201 stops sending the drive control signal in response to the fourth warning signal, and the present application does not limit this.

[0062] In some embodiments, the voltage stress detection circuit 20 specifically further includes a filter circuit 25, which is coupled after the second energy storage circuit 24 and connected to the main control circuit 201 for receiving the second energy storage voltage of the second energy storage circuit 24 and filtering and regulating it.

[0063] Specifically, the filter circuit 25 performs filtering processing on the received second energy storage voltage to remove high-frequency noise and other unnecessary fluctuations, and outputs it to the main control circuit 201, thereby ensuring that the output voltage signal is smoother and more stable.

[0064] The main control circuit 201 can specifically also receive the second energy storage voltage after filtering and adjustment from the filtering circuit 25, and adjust the driving control signal sent to the switching tube 202 accordingly, thereby effectively improving the accuracy of voltage stress assessment. The filtered voltage signal reduces false triggering caused by transient changes, making the system response more stable and reliable, and helping to achieve more precise driving control.

[0065] Please continue to refer to Figure 3 and Figure 4 ,in, Figure 3 yes Figure 2 A schematic diagram of the structure of an embodiment of a switch regulation circuit, Figure 4 yes Figure 3Schematic diagram of the waveform of the switching voltage signal of each switching tube in the switching regulation circuit.

[0066] It is understandable that the switch regulation circuit 200 may specifically include a transformer, a high voltage part of a full-bridge structure located on the primary side of the transformer, i.e., the high voltage side HV, whose ground is HVGND, and a low voltage part of a full-wave rectifier structure located on the secondary side of the transformer, i.e., the low voltage side LV, the main control chip is located on the low voltage side LV, and its ground is GND. And the switch regulation circuit 200 is only an example, in fact, it can include any fully controlled power device, and specifically can also be a totem pole conversion circuit, a boost conversion circuit, a buck conversion circuit or any other reasonable signal function circuit integrated with power semiconductor devices, and this application does not limit this.

[0067] In this embodiment, the switching regulation circuit 200 specifically includes a first switch tube Q1, a second switch tube Q2, a third switch tube Q3, a fourth switch tube Q4, a fifth switch tube Q5 and a sixth switch tube Q6, a transformer T, an output inductor L, an output capacitor C and a main control circuit (not shown in the figure), and the transformer T includes a primary winding RZ1 and a secondary winding RZ2 that are coupled.

[0068] The second end of the third switch tube Q3 is coupled to the second end of the fifth switch tube Q5, and is used to couple with the first end of the power supply circuit (not shown in the figure), the third end of the third switch tube Q3 is coupled to the second end of the fourth switch tube Q4 and the first end of the primary winding RZ1, the third end of the fifth switch tube Q5 is coupled to the second end of the sixth switch tube Q6 and the second end of the primary winding RZ1, the third end of the fourth switch tube Q4 is coupled to the third end of the sixth switch tube Q6 and the high-voltage side grounding terminal HVGND, and is used to couple with the second end of the power supply circuit. end coupling; the first end of the secondary winding RZ2 is coupled to the second end of the second switch tube Q2, the second end of the secondary winding RZ2 is coupled to the first end of the output inductor L, the second end of the output inductor L is coupled to the first end of the output capacitor C, the third end of the secondary winding RZ2 is coupled to the second end of the first switch tube Q1, the third end of the first switch tube Q1 is coupled to the third end of the second switch tube Q2 and the second end of the output capacitor C and is grounded GND; the first end of each switch tube 202 in the first to sixth switch tubes Q6 is coupled to the main control circuit 201.

[0069] It is worth noting that if Figure 4 As shown, in an ideal situation, when each switch tube 202 is turned on, the charge regulation circuit 21 will monitor a lower voltage difference (close to 0V); and when the switch tube 202 is turned off, the charge regulation circuit 21 will monitor a higher voltage spike. However, in actual applications, when the first switch tube Q1 and the second switch tube Q2 are turned off, due to the parasitic parameters of the power circuit and the switch tube 202 itself, an oscillating voltage spike greater than the steady-state voltage will be stimulated at both ends of the first switch tube Q1 and the second switch tube Q2.

[0070] For further information, see Figure 5 , Figure 5 It is a structural diagram of the third embodiment of the voltage stress detection circuit of the present application. The difference between the voltage stress detection circuit in this embodiment and the second embodiment of the voltage stress detection circuit provided in the present application is that the charging regulation circuit 31 in the voltage stress detection circuit 30 includes a first diode D1 and a first resistor R1, the first energy storage circuit 32 includes a first capacitor C1, the voltage divider regulation circuit 33 includes a second resistor R2, a third resistor R3 and a second diode D2, and the second energy storage circuit 34 includes a second capacitor C2.

[0071] Among them, the first end of the first diode D1 is used to couple with the switch tube 202, the second end of the first diode D1 is coupled to the first end of the first resistor R1, the second end of the first resistor R1 is coupled to the first end of the first capacitor C1 and the first end of the second resistor R2, the second end of the first capacitor C1 is coupled to the second end of the third resistor R3, the second end of the second capacitor C2 and grounded GND, the second end of the second resistor R2 is coupled to the first end of the third resistor R3 and the first end of the second diode D2, the second end of the second diode D2 is coupled to the first end of the second capacitor C2, and is used to couple with the main control circuit.

[0072] In some embodiments, the voltage stress detection circuit 30 specifically also includes a filtering circuit 35, the filtering circuit 35 includes a fourth resistor R4, a third capacitor C3 and a fifth resistor R5; wherein, the first end of the fourth resistor R4 is coupled to the second end of the second diode D2 and the first end of the second capacitor C2, the second end of the fourth resistor R4 is coupled to the first end of the third capacitor C3 and the first end of the fifth resistor R5, and is used to couple with the main control circuit, the second end of the third capacitor C3 is coupled to the second end of the fifth resistor R5, the second end of the first capacitor C1, the second end of the third resistor R3, the second end of the second capacitor C2 and is grounded GND.

[0073] It can be understood that, taking the switch tube 202 to be detected in the switch regulation circuit 200 as the first switch tube Q1, the first input terminal VH+ of the voltage stress detection circuit 30 is connected to the second terminal Vds1 of the first switch tube Q1, the second input terminal VH- of the voltage stress detection circuit 30 is connected to the third terminal of the first switch tube Q1, and the first output terminal VL+ and the second output terminal VL- of the voltage stress detection circuit 30 are connected to the main control circuit as an example, it can be known that the oscillating peak voltage between the second terminal Vds1 and the third terminal of the first switch tube Q1 will charge the first capacitor C1 through the first diode D1 and the first resistor R1. The charging speed of the first capacitor C1 can be adjusted by adjusting the resistance value of the first resistor R1. Under the premise of ensuring that the first diode D1 will not overcurrent, the faster the charging speed, the better, so as to ensure that the voltage of the first capacitor C1 is closer to the voltage peak of the actual switching voltage signal.

[0074] Since the resistance values ​​of the second resistor R2 and the third resistor R3 are relatively large, even if the switch voltage signal drops to 0 after the first switch tube Q1 is turned on, the first energy storage voltage of the first capacitor C1 can still be maintained until the next switching cycle. The first energy storage voltage of the first capacitor C1 is generally relatively high, more than tens of volts, and the voltage of the input port of the main control circuit needs to be lower than 3.3 or 5V.

[0075] Therefore, it is necessary to divide the voltage through the second resistor R2 and the third resistor R3 to reduce the voltage to below 3.3V or 5V, and then pass it to the subsequent circuit. After the voltage drops to a low voltage of 3.3V or 5V, the second capacitor C2 will be charged through the second diode D2, and the second energy storage voltage of the second capacitor C2 is in a linear function relationship with the first energy storage voltage of the first capacitor C1. Finally, it is filtered by the fourth resistor R4, the third capacitor C3 and the fifth resistor R5, and the voltage value is transmitted to the input port of the main control circuit after filtering out high-frequency interference. The main control circuit collects the voltage of the second capacitor C2, and through the linear function relationship with the first capacitor C1, the first energy storage voltage of the first capacitor C1 can be calculated. The first energy storage voltage of the first capacitor C1 is the voltage stress of the first switch tube Q1. When the voltage value calculated by the main control circuit exceeds the limit value of the first switch tube Q1, it can respond immediately and adopt wave blocking or power reduction to avoid further increase in the voltage stress of the first switch tube Q1.

[0076] It is worth noting that when the switch tube 202 to be detected in the switch regulation circuit 200 is the second switch tube Q2, the first input terminal VH+ of the voltage stress detection circuit 30 can also be connected to the second terminal Vds2 of the second switch tube Q2, and the second input terminal VH- of the voltage stress detection circuit 30 is connected to the third terminal of the second switch tube Q2, and the corresponding signal processing process is the same as above; and when the switch regulation circuit 200 is other circuit forms, the signal processing process of the switch tube 202 located on the low-voltage side LV is also the same as above, and will not be repeated here.

[0077] The above scheme monitors the voltage stress of the first switch tube Q1 and / or the second switch tube Q2 in real time. Once the stress exceeds the limit value, the main control circuit immediately responds to avoid the first switch tube Q1 and / or the second switch tube Q2 being damaged due to continuous increase in stress, thereby achieving the purpose of improving product reliability.

[0078] See also Figure 6 , Figure 6 The voltage stress detection circuit in this embodiment differs from the second embodiment of the voltage stress detection circuit provided in this application in that the voltage stress detection circuit 40 further includes an isolation circuit 47 .

[0079] It is understandable that when the switch tube 202 to be detected in the switch regulation circuit 200 is located at the high voltage side HV, and the main control circuit 201 is located at the low voltage side LV so that they cannot share a common ground, an isolation circuit 47 needs to be introduced.

[0080] Specifically, the isolation circuit 47 is coupled after the second energy storage circuit 44 and connected to the main control circuit 201. The isolation circuit 47 receives the second energy storage voltage of the second energy storage circuit 44, isolates and adjusts it, and outputs it to the main control circuit 201, ensuring that the main control circuit 201 is completely electrically isolated from the high-voltage side HV to prevent any possible risk of electric shock or interference, thereby avoiding potential safety hazards and significantly improving the safety and reliability of the system; and the isolated second energy storage voltage is transmitted to the main control circuit 201, which will provide a safe and reliable voltage stress reference signal for the main control circuit 201.

[0081] In some embodiments, the isolation circuit 47 may specifically include one or more of any reasonable circuit units with the function of isolating the high and low voltage sides LV, such as optocouplers, transformer isolation, digital isolators, etc., to achieve electrical isolation without affecting signal transmission. This application does not limit this.

[0082] In some embodiments, the voltage stress detection circuit 40 specifically also includes a differential input isolation op amp circuit 48, which is coupled to an isolation circuit 47. The isolation circuit 47 is used to cooperate with the differential input isolation op amp circuit 48 to isolate and adjust the second energy storage voltage, which can effectively improve the anti-interference ability of the signal and ensure that the second energy storage voltage is accurately isolated and adjusted before being transmitted to the main control circuit 201, so as to further improve the signal processing capability and reliability of the system.

[0083] It is understandable that the charging regulation circuit 41, the first energy storage circuit 42, the voltage division regulation circuit 43, the second energy storage circuit 44 and the filter circuit 45 in this embodiment are respectively the same as the charging regulation circuit 21, the first energy storage circuit 22, the voltage division regulation circuit 23, the second energy storage circuit 24 and the filter circuit 25. For details, please refer to Figure 2 And the related text content will not be repeated here.

[0084] See also Figure 7 , Figure 7 The voltage stress detection circuit in this embodiment differs from the third embodiment of the voltage stress detection circuit provided in this application in that the voltage stress detection circuit 50 further includes an isolation circuit 57 .

[0085] It is understandable that if Figure 3As shown, taking the switch tube 202 to be detected in the switch regulation circuit 200 as the fourth switch tube Q4 or the sixth switch tube Q6, the first input terminal VH+ of the voltage stress detection circuit 50 is connected to the second terminal of the fourth switch tube Q4 or the sixth switch tube Q6, and the second input terminal VH- of the voltage stress detection circuit 50 is connected to the high-voltage side ground terminal HVGND as an example, it can be known that since the fourth switch tube Q4 and the sixth switch tube Q6 are located at the high-voltage side HV of the switch regulation circuit 200, and the main control circuit 201 is located at the low-voltage side LV, they cannot share a common ground. Therefore, an isolation circuit 57 needs to be provided to electrically isolate the voltage stress detection circuit 50 from the main control circuit 201.

[0086] The main control circuit 201 includes a digital signal processing circuit DSP; a first end of the isolation circuit 57 is coupled to a first level providing end HV-VCC, a second end of the isolation circuit 57 is coupled to a second level providing end VCC, a third end in+ of the isolation circuit 57 is coupled to a second end of a fourth resistor R4, a first end of a third capacitor C3 and a first end of a fifth resistor R5, a fourth end in- of the isolation circuit 57 is coupled to a second input end VH-, a second end of a first capacitor C1, a second end of a third resistor R3, a second end of a second capacitor C2, a second end of a third capacitor C3 and a second end of a fifth resistor R5, a fifth end of the isolation circuit 57 is coupled to a high-voltage side ground end HVGND, a sixth end out of the isolation circuit 57 is coupled to the digital signal processing circuit DSP, and a seventh end of the isolation circuit 57 is coupled to a ground end GND.

[0087] The processing process of the voltage stress detection circuit 50 for the switching voltage signal of the fourth switch tube Q4 or the sixth switch tube Q6 in this embodiment is similar to that in the embodiment of the present invention. Figure 5 The difference between the processing process of the switching voltage signal of the first switch tube Q1 or the second switch tube Q2 by the voltage stress detection circuit 30 in the embodiment is that after obtaining the second energy storage voltage after filtering, it is further isolated and adjusted by the isolation circuit 57 and then output to the digital signal processing circuit DSP of the main control circuit 201. For details, please refer to Figure 5 And the related text content will not be repeated here.

[0088] Further, in some embodiments, when the switch tube 202 to be detected in the switch regulation circuit 200 is the third switch tube Q3 or the fifth switch tube Q5, the first input terminal VH+ of the voltage stress detection circuit 50 is connected to the second end of the third switch tube Q3 or the fifth switch tube Q5, and the second input terminal VH- of the voltage stress detection circuit 50 is connected to the third end of the third switch tube Q3 or the fifth switch tube Q5, the voltage stress detection circuit 50 may further specifically include a differential input isolation operational amplifier circuit 58, which is coupled to the isolation circuit 57 to cooperate with each other to isolate and regulate the second energy storage voltage after filtering, and then output it to the digital signal processing circuit DSP of the main control circuit 201.

[0089] It is understandable that the charging regulation circuit 51, the first energy storage circuit 52, the voltage division regulation circuit 53, the second energy storage circuit 54 and the filter circuit 55 in this embodiment are respectively the same as the charging regulation circuit 31, the first energy storage circuit 32, the voltage division regulation circuit 33, the second energy storage circuit 34 and the filter circuit 35. For details, please refer to Figure 5 And the related text content will not be repeated here.

[0090] See also Figure 8 , Figure 8 The voltage stress detection circuit in this embodiment differs from the voltage stress detection circuit in the fourth embodiment provided by the present application in that the voltage stress detection circuit 60 further includes a gating circuit 69 .

[0091] It is understandable that the number of switch tubes 202 to be detected in the switch regulation circuit 200 is at least two. In order to save circuit resources as much as possible and effectively detect the voltage stress of each switch tube 202, it is necessary to introduce a gating circuit 69 to achieve orderly switching between multiple switch tubes 202 and the charging regulation circuit 61, ensuring that each switch tube 202 can obtain effective voltage stress monitoring under its corresponding charging regulation circuit 61; and the switching frequency of the gating circuit 69 needs to be as close as possible to the switching frequency of each switch tube 202 to avoid untimely monitoring and feedback regulation.

[0092] Specifically, the number of the switch tubes 202 and the charging regulation circuits 61 is equal and is at least two. The selection circuit 69 couples each charging regulation circuit 61 and is used to couple with each switch tube 202. Each switch tube 202 is coupled to its corresponding charging regulation circuit 61 in a cyclic and alternating manner at each interval set time.

[0093] It is understandable that the gating circuit 69 can specifically connect each switch tube 202 to its corresponding charging regulation circuit 61 in sequence according to a preset time interval (such as milliseconds or shorter), and ensure that each switch tube 202 can obtain effective voltage stress monitoring under its corresponding charging regulation circuit 61 through a cyclic alternation. It can be seen that the gating circuit 69 enables multiple switch tubes 202 and the charging regulation circuit 61 to work in turn, ensuring that each switch tube 202 can obtain sufficient voltage stress monitoring.

[0094] In some embodiments, the gating circuit 69 may specifically include one or more of any reasonable elements with a gating function, such as a relay, a switch tube, a timer, a multiplexer, etc., and the present application does not limit this.

[0095] Among them, taking the selection circuit 69 including at least two relays as an example, the relay further includes a controlled coil and a normally open contact, each controlled coil is coupled to the main control circuit 201, and each normally open contact is coupled between each switch tube 202 and each corresponding charging regulation circuit 61, so that when each controlled coil receives the trigger signal sent by the main control circuit 201 in a cyclic and alternating manner at each set time interval, each normally open contact can be turned on and switched in an orderly manner, so that each switch tube 202 is cyclically and alternately coupled to its corresponding charging regulation circuit 61 in turn, ensuring that each switch tube 202 can obtain effective voltage stress monitoring under its corresponding charging regulation circuit 61.

[0096] It is understandable that the first energy storage circuit 62, the voltage-dividing regulating circuit 63, the second energy storage circuit 64, the filtering circuit 65, the isolation circuit 67 and the differential input isolation amplifier circuit 68 in this embodiment are respectively the same as the first energy storage circuit 42, the voltage-dividing regulating circuit 43, the second energy storage circuit 44, the filtering circuit 45, the isolation circuit 47 and the differential input isolation amplifier circuit 48. For details, please refer to Figure 6 And the related text content will not be repeated here.

[0097] See also Fig. 9 , Fig. 9 The voltage stress detection circuit in this embodiment differs from the fifth embodiment of the voltage stress detection circuit provided in this application in that the voltage stress detection circuit 70 further includes a gating circuit 79 .

[0098] For ease of understanding, Figure 3As shown, taking the example that the gating circuit 79 includes a first relay and a second relay, the first relay includes a first controlled coil and a first normally open contact K1 coupled to each other, and the second relay includes a second controlled coil and a second normally open contact K2 coupled to each other, the first controlled coil and the second controlled coil are coupled to the main control circuit 201, the first normally open contact K1 is coupled between the third switch tube Q3 and one of the first diodes D1, and the second normally open contact K2 is coupled between the fifth switch tube Q5 and another first diode D1, so that when the main control circuit 201 sends a trigger signal to the first controlled coil and the second controlled coil in a cyclic and alternating manner, the first normally open contact K1 and the second normally open contact K2 can be switched on and off in an orderly manner, so that the third switch tube Q3 and the fifth switch tube Q5 are cyclically and alternately coupled to their corresponding charging regulation circuits 71 in a cyclic and alternating manner, ensuring that the third switch tube Q3 and the fifth switch tube Q5 can both obtain effective voltage stress monitoring under their corresponding charging regulation circuits 71. For the corresponding signal processing process, please refer to Figure 8 And the related text content will not be repeated here.

[0099] In other embodiments, when the switch tubes 202 to be detected in the switch regulation circuit 200 are the fourth switch tube Q4 and the sixth switch tube Q6, the voltage stress detection circuit 70 can specifically remove the differential input isolation amplifier circuit 78; and when the switch tubes 202 to be detected in the switch regulation circuit 200 are the first switch tube Q1 and the second switch tube Q2, the voltage stress detection circuit 70 can specifically further remove the isolation circuit 57; and when the switch tubes 202 to be detected in the switch regulation circuit 200 are any number of switch tubes 202 from the first to the sixth switch tubes Q6, the selection circuit 79 can specifically further include 1, 2, 3 or 6 relays, which are the same number as the switch tubes 202 to be detected, and the voltage stress detection circuit 70 needs to include the isolation circuit 57 and the differential input isolation amplifier circuit 78, which is not limited in the present application.

[0100] In other embodiments, when there are at least two switch tubes 202 to be detected in the switch regulation circuit 200, and they are both on the high-voltage side HV or the low-voltage side LV, the selection circuit 79 can be specifically removed, but at this time what is detected is the maximum value of the voltage stress of at least two switch tubes 202, that is, when the main control circuit 201 detects that the voltage stress exceeds the set voltage threshold, the switching states of at least two switch tubes 202 to be detected are specifically adjusted synchronously, and the present application does not limit this.

[0101] It is understandable that the first energy storage circuit 72, the voltage-dividing regulating circuit 73, the second energy storage circuit 74, the filtering circuit 75, the isolation circuit 77 and the differential input isolation amplifier circuit 78 in this embodiment are respectively the same as the first energy storage circuit 52, the voltage-dividing regulating circuit 53, the second energy storage circuit 54, the filtering circuit 55, the isolation circuit 57 and the differential input isolation amplifier circuit 58. For details, please refer to Figure 7 And the related text content will not be repeated here.

[0102] This application also specifically adopts a voltage stress detection method, see Fig.10 , Fig.10 This is a flow chart of the first implementation of the voltage stress detection method of the present application. Specifically, it may include the following steps: S81: Obtain the switching voltage signal of the switching tube.

[0103] It is understandable that the voltage stress detection method in this embodiment is specifically a method in which the voltage stress detection circuit monitors the switch voltage signal of the switch tube in the switch regulation circuit in real time, and performs feedback regulation on the switch tube in response to possible voltage stress anomalies, so as to effectively avoid excessive power consumption of the switch tube, affecting its life, or even causing irreversible failure or burning. The switch regulation circuit includes a main control circuit and a switch tube controlled by the main control circuit; the voltage stress detection circuit includes a charging regulation circuit and a first energy storage circuit, the charging regulation circuit is used to couple with the switch tube, the first energy storage circuit is coupled to the charging regulation circuit, and is used to couple with the main control circuit.

[0104] It is worth noting that when the first end of the switch tube is the control end and the first end of the switch tube receives a corresponding driving control signal sent by the main control circuit, it can trigger the second end and the third end to be turned on or off in response to the driving control signal.

[0105] Specifically, the charging regulation circuit obtains the switching voltage signals of the second end and the third end of the switching tube.

[0106] S82: Obtain a first energy storage voltage using the switch voltage signal.

[0107] The first energy storage circuit is used to store the electric energy from the charging regulation circuit and convert it into a first energy storage voltage that can be read by the main control circuit.

[0108] S83: Outputting the first energy storage voltage to the main control circuit, so that the main control circuit adjusts the driving control signal sent to the switch tube in response to the first energy storage voltage.

[0109] It is understandable that the charging regulation circuit is used to obtain the switching voltage signal of the switching tube, and use the switching voltage signal to start charging the first energy storage circuit. The first energy storage circuit gradually accumulates energy, and its voltage level, that is, the first energy storage voltage, reflects the maximum voltage stress in the most recent switching event.

[0110] The main control circuit detects and reads the first energy storage voltage, and evaluates the current working state of the switch tube accordingly, and determines whether it is necessary to adjust the driving control signal sent to the switch tube according to a preset safety threshold.

[0111] If the main control circuit detects that the first energy storage voltage exceeds the set safety range, it indicates that the switch tube is subjected to excessive voltage stress, and the main control circuit can take measures to reduce the load, power, slow down the switching speed, or temporarily stop the switching operation, such as reducing the duty cycle and / or signal frequency of the drive control signal sent to the switch tube, or directly blocking the drive control signal, that is, not sending the drive control signal to the switch tube, to protect the switch tube from damage. On the contrary, if it is detected that the first energy storage voltage is within the safety range, the main control circuit can maintain a normal drive control strategy.

[0112] It can be seen that the voltage stress detection circuit can effectively monitor and record the voltage stress of the corresponding switch tube, and quickly feed back to the main control circuit, realizing real-time monitoring of voltage stress. And by accurately measuring the transient voltage changes at both ends of the switch tube, the accuracy of voltage stress evaluation is ensured. The entire detection process does not interfere with the normal operation of the original switch regulation circuit, avoiding the introduction of additional noise or errors. The main control circuit can flexibly adjust the drive control strategy according to actual needs, improving the adaptability and reliability of the system. Compared with complex external monitoring equipment, this built-in voltage stress detection solution has a simple structure and is easy to integrate, reducing the overall system cost. Application scenario This voltage stress detection circuit is particularly suitable for various switch regulation circuits, especially those applications with strict requirements on power semiconductor devices, such as motor drivers, on-board chargers, DC-DC (Direct Current, DC to DC) converters of new energy vehicles. By introducing such a circuit, it can not only effectively prevent power devices from failing due to excessive voltage stress, but also provide valuable data support for subsequent product reliability analysis. In short, this voltage stress detection circuit realizes efficient and accurate monitoring of the voltage stress of the switch tube through the cooperation of the charging regulation circuit and the first energy storage circuit. It not only helps to improve the overall performance and reliability of switching regulation circuits, but also provides a solid foundation for future intelligent control and fault diagnosis.

[0113] See also Fig.11 , Fig.11: is a flow chart of a second embodiment of the voltage stress detection method of the present application. The voltage stress detection method of this embodiment is Fig.10 A schematic flow chart of a detailed embodiment of the voltage stress detection method in the embodiment of the present invention comprises the following steps: S91: Obtain the switching voltage signal of the switching tube.

[0114] S92: Obtain a first energy storage voltage using the switch voltage signal.

[0115] Among them, S91 and S92 are Fig.10 S81 and S82 are the same. For details, please refer to S81 and S82 and their related text descriptions, which will not be repeated here.

[0116] S93: performing voltage division adjustment on the first energy storage voltage.

[0117] Specifically, the voltage stress detection circuit also includes a voltage divider regulation circuit and a second energy storage circuit. The voltage divider regulation circuit is coupled between the first energy storage circuit and the second energy storage circuit. The second energy storage circuit is coupled after the voltage divider regulation circuit and is connected to the main control circuit.

[0118] Among them, the voltage divider regulation circuit is used to receive the first energy storage voltage of the first energy storage circuit and perform voltage division regulation on it, and can specifically reduce the amplitude of the first energy storage voltage according to a preset ratio or dynamic adjustment strategy to ensure that the voltage transmitted to the main control circuit is within a safe range, thereby avoiding damage to the main control circuit caused by excessive high voltage.

[0119] S94: Obtain a second energy storage voltage using the first energy storage voltage adjusted by voltage division.

[0120] The second energy storage circuit receives and stores the first energy storage voltage after voltage division and adjustment, and gradually accumulates energy. Its voltage level, that is, the second energy storage voltage, reflects the voltage stress of the switch tube.

[0121] S95: Outputting the second energy storage voltage to the main control circuit, so that the main control circuit adjusts the driving control signal sent to the switch tube in response to the second energy storage voltage.

[0122] The main control circuit detects and reads the second energy storage voltage, and evaluates the current working state of the switch tube accordingly, so as to determine whether the drive control signal sent to the switch tube needs to be adjusted according to a preset safety threshold.

[0123] If the main control circuit detects that the second energy storage voltage exceeds the set safety range, it indicates that the switch tube is subjected to excessive voltage stress, and the main control circuit can take measures to reduce the load, slow down the switching speed, or temporarily stop the switching operation to protect the switch tube from damage. Conversely, if it is detected that the second energy storage voltage is within the safety range, the main control circuit can maintain a normal drive control strategy.

[0124] See also Fig.12 , Fig.12 : is a flow chart of the third embodiment of the voltage stress detection method of the present application. The voltage stress detection method of this embodiment is Fig.11 A schematic flow chart of a detailed embodiment of the voltage stress detection method in the embodiment of the present invention comprises the following steps: S101: Obtain a switch voltage signal of a switch tube.

[0125] S102: Obtain a first energy storage voltage using a switch voltage signal.

[0126] S103: performing voltage division adjustment on the first energy storage voltage.

[0127] S104: Obtain a second energy storage voltage using the first energy storage voltage adjusted by voltage division.

[0128] Among them, S101, S102, S103 and S104 are Fig.11 The S91, S92, S93 and S94 in the figure are the same. Please refer to S91, S92, S93 and S94 and their related text descriptions for details, which will not be repeated here.

[0129] S105: Detect whether the second energy storage voltage is greater than a first preset threshold.

[0130] Specifically, the voltage stress detection circuit further includes a signal processing circuit, which is coupled after the second energy storage circuit and connected to the main control circuit.

[0131] The signal processing circuit is used for receiving the second energy storage voltage of the second energy storage circuit, and comparing it with the first preset threshold value to determine whether the second energy storage voltage is greater than the first preset threshold value.

[0132] If the second energy storage voltage is greater than the first preset threshold, S106 is executed; if the second energy storage voltage is not greater than the first preset threshold, the process returns to execute S101.

[0133] S106: Detect whether the second energy storage voltage is greater than a second preset threshold.

[0134] Specifically, the signal processing circuit further compares the second energy storage voltage with a second preset threshold value to determine whether the second energy storage voltage is greater than the second preset threshold value.

[0135] If the second energy storage voltage is greater than the second preset threshold, S108 is executed; if the second energy storage voltage is not greater than the first preset threshold, the process returns to execute S107.

[0136] S107: Sending a first warning signal to the main control circuit, so that the main control circuit reduces the duty cycle or signal frequency of the driving control signal in response to the first warning signal.

[0137] The signal processing circuit sends a first warning signal to the main control circuit when detecting that the second energy storage voltage exceeds the first preset threshold but does not exceed the second preset threshold.

[0138] After receiving the first warning signal, the main control circuit takes preventive measures, such as reducing the duty cycle of the drive control signal or lowering the signal frequency, to reduce the voltage stress of the switch tube.

[0139] S108: Sending a second warning signal to the main control circuit, so that the main control circuit stops sending the driving control signal in response to the second warning signal.

[0140] When the signal processing circuit detects that the second energy storage voltage exceeds the second preset threshold, the signal processing circuit sends a second warning signal to the main control circuit.

[0141] After receiving the second warning signal, the main control circuit immediately stops sending the drive control signal to prevent the switch tube from being damaged due to excessive voltage stress.

[0142] Specifically, in some other embodiments, between the above S106 and S101, it also includes: sending a voltage feedback signal to the main control circuit based on the currently acquired second energy storage voltage, so that the main control circuit sends the drive control signal normally, that is, the current drive control signal sent to the switch tube is not changed, and the voltage feedback signal is recorded for subsequent analysis and statistics.

[0143] See also Fig.13 , Fig.13 : is a flow chart of a fourth embodiment of the voltage stress detection method of the present application. The voltage stress detection method of this embodiment is Fig.11 A schematic flow chart of a detailed embodiment of the voltage stress detection method in the embodiment of the present invention comprises the following steps: S111: Obtain a switch voltage signal of the switch tube.

[0144] S112: Obtain a first energy storage voltage using the switch voltage signal.

[0145] S113: performing voltage division adjustment on the first energy storage voltage.

[0146] S114: Obtain a second energy storage voltage using the first energy storage voltage adjusted by voltage division.

[0147] Among them, S111, S112, S113 and S114 are Fig.11 The S91, S92, S93 and S94 in the figure are the same. Please refer to S91, S92, S93 and S94 and their related text descriptions for details, which will not be repeated here.

[0148] S115: Calculate the second energy storage voltage using a set function to obtain the first energy storage voltage.

[0149] Specifically, the voltage stress detection circuit further includes a signal processing circuit, which is coupled after the second energy storage circuit and connected to the main control circuit.

[0150] The signal processing circuit can specifically also receive a second energy storage voltage of the second energy storage circuit, and calculate the first energy storage voltage using the second energy storage voltage.

[0151] S116: Detect whether the calculated first energy storage voltage is greater than a third preset threshold.

[0152] The signal processing circuit compares the calculated first energy storage voltage with a third preset threshold value to determine whether the calculated first energy storage voltage is greater than the third preset threshold value.

[0153] If the calculated first energy storage voltage is greater than the third preset threshold, S117 is executed; if the calculated first energy storage voltage is not greater than the third preset threshold, the process returns to execute S111.

[0154] S117: Sending a third warning signal to the main control circuit, so that the main control circuit reduces the duty cycle or signal frequency of the drive control signal in response to the third warning signal, or stops sending the drive control signal.

[0155] Specifically, when the signal processing circuit detects that the calculated first energy storage voltage exceeds a third preset threshold, the signal processing circuit sends a third warning signal to the main control circuit.

[0156] When receiving the third warning signal, the main control circuit reduces the duty cycle or signal frequency of the drive control signal to reduce the voltage stress of the switch tube; or immediately stops sending the drive control signal to prevent the switch tube from being damaged due to excessive voltage stress.

[0157] Specifically, in some other embodiments, between the above S116 and S111, it also includes: sending a voltage feedback signal to the main control circuit based on the currently acquired second energy storage voltage, so that the main control circuit sends the drive control signal normally, that is, the current drive control signal sent to the switch tube is not changed, and the voltage feedback signal is recorded for subsequent analysis and statistics.

[0158] It is understandable that in some other embodiments, the voltage stress detection circuit specifically includes some other more specific circuit units to implement other more specific voltage stress detection methods. For details, please refer to Figure 1-Figure 9 And related text descriptions will not be repeated here.

[0159] This application also specifically adopts an electric energy conversion circuit, see Fig.14 , Fig.14 1 is a schematic diagram of a structure of an embodiment of a power conversion circuit of the present application. In this embodiment, the power conversion circuit 120 includes a switch regulation circuit 121 and a voltage stress detection circuit 122 coupled to each other.

[0160] It should be noted that the voltage stress detection circuit 122 described in this embodiment is the voltage stress detection circuit 10, the voltage stress detection circuit 20, the voltage stress detection circuit 30, the voltage stress detection circuit 40, the voltage stress detection circuit 50, the voltage stress detection circuit 60 or the voltage stress detection circuit 70 described in any one of the above embodiments. Figure 1-Figure 9 And the related text content will not be repeated here.

[0161] This application also specifically uses an electronic device, see Fig.15 , Fig.15 1 is a schematic diagram of the structure of an electronic device of the present application. In this embodiment, the electronic device 130 includes a housing 131 and a signal function circuit 132 connected to the housing 131 .

[0162] It should be noted that the signal function circuit 132 described in this embodiment is the voltage stress detection circuit 10, the voltage stress detection circuit 20, the voltage stress detection circuit 30, the voltage stress detection circuit 40, the voltage stress detection circuit 50, the voltage stress detection circuit 60 or the voltage stress detection circuit 70 described in any one of the above embodiments, or the power conversion circuit 120. For details, please refer to Figure 1-Figure 9 , Fig.14 And the related text content will not be repeated here.

[0163] The beneficial effects of the present application are as follows: Different from the prior art, the charging regulation circuit in the voltage stress detection circuit provided by the present application is used to couple with the switch tube in the switch regulation circuit, and the first energy storage circuit is coupled with the charging regulation circuit and is used to couple with the main control circuit in the switch regulation circuit; wherein the charging regulation circuit is configured to obtain the switch voltage signal of the switch tube, and use the switch voltage signal to store energy in the first energy storage circuit; the first energy storage circuit is configured to output its current first energy storage voltage to the main control circuit, so that the main control circuit adjusts the driving control signal sent to the switch tube in response to the first energy storage voltage, thereby being able to effectively control the switch tube in the switch regulation circuit. The voltage stress can be monitored in real time, and when abnormal voltage stress is detected, the drive control signal output to the switch tube can be adjusted in time to avoid excessive power consumption of the switch tube, affecting its life, or even irreversible failure or burning, thereby effectively avoiding voltage stress exceeding the standard. When the voltage stress is too high, the event can be recorded, which is also helpful for product reliability analysis and improvement. Regardless of whether the switch regulation circuit is in a known working condition, or whether the circuit parameters are abnormal or in other unknown working conditions, it can effectively monitor whether the voltage stress is abnormal and take effective measures to help improve product quality and product design solutions.

[0164] The above description is only an implementation method of the present application, and does not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly used in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A voltage stress detection circuit, applied to voltage stress detection of a switch regulation circuit, wherein the switch regulation circuit comprises a main control circuit and a switch tube controlled by the main control circuit, characterized in that: The voltage stress detection circuit comprises: A charging regulation circuit, used to be coupled to the switch tube; a first energy storage circuit, coupled to the charging regulation circuit and used to be coupled to the main control circuit; Wherein, the charging regulation circuit is configured to obtain a switching voltage signal of the switching tube, and use the switching voltage signal to store energy in the first energy storage circuit; The first energy storage circuit is configured to output its current first energy storage voltage to the main control circuit, so that the main control circuit adjusts the driving control signal sent to the switch tube in response to the first energy storage voltage.

2. The voltage stress detection circuit according to claim 1, characterized in that: The voltage stress detection circuit further includes a voltage division regulating circuit and a second energy storage circuit, wherein the voltage division regulating circuit is coupled to the first energy storage circuit and the second energy storage circuit, and the second energy storage circuit is used to couple to the main control circuit; The voltage division regulating circuit is configured to receive the first energy storage voltage of the first energy storage circuit, to perform voltage division regulation on the first energy storage voltage, and to use the first energy storage voltage after voltage division regulation to store energy in the second energy storage circuit; The second energy storage circuit is configured to output its current second energy storage voltage to the main control circuit, so that the main control circuit adjusts the driving control signal in response to the second energy storage voltage.

3. The voltage stress detection circuit according to claim 2, characterized in that: The voltage stress detection circuit further includes a signal processing circuit, the signal processing circuit is coupled to the second energy storage circuit and is used to couple to the main control circuit; Wherein, the signal processing circuit is configured to receive the second energy storage voltage of the second energy storage circuit, to compare the second energy storage voltage with the first preset threshold and the second preset threshold respectively to obtain a first comparison result and a second comparison result, and to send a first warning signal or a second warning signal to the main control circuit in response to the first comparison result and the second comparison result, so that the main control circuit reduces the duty cycle or signal frequency of the drive control signal in response to the first warning signal, or stops sending the drive control signal in response to the second warning signal; wherein, the first preset threshold is less than the second preset threshold.

4. The voltage stress detection circuit according to claim 2, characterized in that: The voltage stress detection circuit further includes a signal processing circuit, the signal processing circuit is coupled to the second energy storage circuit and is used to couple to the main control circuit; Among them, the signal processing circuit is configured to receive the second energy storage voltage of the second energy storage circuit, and use a set function to calculate the first energy storage voltage from the second energy storage voltage, so as to compare the calculated first energy storage voltage with a third preset threshold to obtain a third comparison result, and in response to the third comparison result, send a voltage feedback signal or a third early warning signal to the main control circuit, so that the main control circuit sends the drive control signal normally in response to the voltage feedback signal, or reduces the duty cycle or signal frequency of the drive control signal in response to the third early warning signal, or stops sending the drive control signal.

5. The voltage stress detection circuit according to claim 2, characterized in that: The voltage stress detection circuit further includes a filter circuit, which is coupled to the second energy storage circuit and is used to couple to the main control circuit; The filtering circuit is configured to receive the second energy storage voltage of the second energy storage circuit, and after filtering and adjusting the second energy storage voltage, output it to the main control circuit, so that the main control circuit adjusts the drive control signal in response to the filtered and adjusted second energy storage voltage.

6. The voltage stress detection circuit according to claim 2, characterized in that: The voltage stress detection circuit further includes an isolation circuit, which is coupled to the second energy storage circuit and is used to couple to the main control circuit; The isolation circuit is configured to receive the second energy storage voltage of the second energy storage circuit, isolate and adjust the second energy storage voltage, and then output it to the main control circuit, so that the main control circuit adjusts the drive control signal in response to the second energy storage voltage after isolation and adjustment.

7. The voltage stress detection circuit according to claim 6, characterized in that: The voltage stress detection circuit also includes a differential input isolation operational amplifier circuit, which is coupled to the isolation circuit. The isolation circuit is used to cooperate with the differential input isolation operational amplifier circuit to isolate and adjust the second energy storage voltage.

8. The voltage stress detection circuit according to claim 2, characterized in that: The charging regulation circuit includes a first diode and a first resistor, the first energy storage circuit includes a first capacitor, the voltage division regulation circuit includes a second resistor, a third resistor and a second diode, and the second energy storage circuit includes a second capacitor; Among them, the first end of the first diode is used to couple with the switch tube, the second end of the first diode is coupled with the first end of the first resistor, the second end of the first resistor is coupled with the first end of the first capacitor and the first end of the second resistor, the second end of the first capacitor is coupled with the second end of the third resistor, the second end of the second capacitor and grounded, the second end of the second resistor is coupled with the first end of the third resistor and the first end of the second diode, the second end of the second diode is coupled with the first end of the second capacitor, and is used to couple with the main control circuit.

9. The voltage stress detection circuit according to any one of claims 1 to 8, characterized in that: The voltage stress detection circuit also includes a gating circuit. The number of the switching tubes and the charging regulation circuits is equal and is at least two. The gating circuit is coupled to each of the charging regulation circuits and is used to couple to each of the switching tubes, and to couple each of the switching tubes to its corresponding charging regulation circuit in a cycle at each interval set time.

10. A voltage stress detection method, characterized in that: The voltage stress detection method comprises: Obtaining a switching voltage signal of the switching tube; Obtaining the first energy storage voltage using the switch voltage signal; The first energy storage voltage is output to a main control circuit, so that the main control circuit adjusts a driving control signal sent to the switch tube in response to the first energy storage voltage.

11. The voltage stress detection method according to claim 10, characterized in that: After the step of obtaining the first energy storage voltage by using the switch voltage signal, and before the step of outputting the first energy storage voltage to the main control circuit so that the main control circuit adjusts the driving control signal sent to the switch tube in response to the first energy storage voltage, the method further includes: Performing voltage division adjustment on the first energy storage voltage; Obtaining a second energy storage voltage by using the first energy storage voltage adjusted by voltage division; The step of outputting the first energy storage voltage to the main control circuit so that the main control circuit adjusts the driving control signal sent to the switch tube in response to the first energy storage voltage comprises: The second energy storage voltage is output to the main control circuit, so that the main control circuit adjusts the driving control signal sent to the switch tube in response to the second energy storage voltage.

12. The voltage stress detection method according to claim 11, characterized in that: After the step of obtaining the second energy storage voltage by using the first energy storage voltage after voltage division adjustment, and before the step of outputting the second energy storage voltage to the main control circuit so that the main control circuit adjusts the driving control signal sent to the switch tube in response to the second energy storage voltage, the method further includes: Detecting whether the second energy storage voltage is greater than a first preset threshold; If the second energy storage voltage is greater than the first preset threshold, detecting whether the second energy storage voltage is greater than a second preset threshold; The step of outputting the second energy storage voltage to the main control circuit so that the main control circuit adjusts the driving control signal sent to the switch tube in response to the second energy storage voltage comprises: If the second energy storage voltage is not greater than the second preset threshold, sending a first warning signal to the main control circuit, so that the main control circuit reduces the duty cycle or signal frequency of the drive control signal in response to the first warning signal; If the second energy storage voltage is greater than the second preset threshold, a second warning signal is sent to the main control circuit, so that the main control circuit stops sending the drive control signal in response to the second warning signal.

13. The voltage stress detection method according to claim 11, characterized in that: After the step of obtaining the second energy storage voltage by using the first energy storage voltage after voltage division adjustment, and before the step of outputting the second energy storage voltage to the main control circuit so that the main control circuit adjusts the driving control signal sent to the switch tube in response to the second energy storage voltage, the method further includes: Calculating the second energy storage voltage using a set function to obtain the first energy storage voltage; Detecting whether the calculated first energy storage voltage is greater than a third preset threshold; The step of outputting the second energy storage voltage to the main control circuit so that the main control circuit adjusts the driving control signal sent to the switch tube in response to the second energy storage voltage comprises: If the calculated first energy storage voltage is greater than the third preset threshold, a third warning signal is sent to the main control circuit, so that the main control circuit reduces the duty cycle or signal frequency of the drive control signal in response to the third warning signal, or stops sending the drive control signal.

14. An electric energy conversion circuit, characterized in that: The electric energy conversion circuit includes a switch regulation circuit and a voltage stress detection circuit coupled to each other; Wherein, the voltage stress detection circuit is the voltage stress detection circuit as described in any one of claims 1-9.

15. An electronic device, characterized in that: The electronic device comprises a housing and a signal function circuit connected to the housing; Wherein, the signal function circuit is the voltage stress detection circuit as described in any one of claims 1 to 9, or the electric energy conversion circuit as described in claim 14.

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