Clamping circuit shielding control method and system for high-frequency and high-voltage application scene

Abstract

The invention relates to the field of high-voltage tests, in particular to a clamping circuit shielding control method and system for a high-frequency and high-voltage application scene, and aims to solve the problems that a TVS (Transient Voltage Suppressor) device cannot realize automatic equalization and relatively high heat can occur under high frequency and high voltage. The overload or overheating state of the TVS tube can be accurately recognized by collecting and analyzing key operation parameters such as the passing current and the temperature of the TVS tube in real time, the parallel auxiliary circuit is actively started for shunting when the operation state approaches a set threshold value, the instantaneous and continuous operation load of the TVS tube is effectively reduced, and the service life of the TVS tube is prolonged. The operating state of the auxiliary circuit and the operating states of the plurality of voltage limiting units are globally compared and planned, active balancing of operating loads among different voltage limiting units is realized, the dynamic response capability and reliability of the clamping circuit under high-frequency and high-voltage impact are remarkably improved, the protection effect on core devices is enhanced, and the reliability of the clamping circuit is improved. The circuit service life is prolonged.

Description

TECHNICAL FIELD

[0001] The application relates to the field of high-voltage tests, in particular to a shielding control method and system of a clamping circuit for a high-frequency and high-voltage application scenario. BACKGROUND

[0002] In a high-voltage test application, in order to avoid overvoltage damage to the output port of a power supply, a voltage limiting component such as a lightning arrester or a voltage-dependent resistor is generally arranged at the port, but the arrangement of the lightning arrester or the voltage-dependent resistor at the port of a high-frequency and high-voltage power supply will cause high loss at high frequency, and high temperature will occur in the application process, so that the power supply cannot work stably for a long time. Therefore, a TVS device is generally configured as a voltage limiting component at the port of the high-frequency and high-voltage power supply.

[0003] In order to meet the voltage limiting amplitude requirement of the power supply, dozens of TVS tubes are generally connected in series or hundreds of TVS tubes are connected in series. In a high-voltage and high-frequency application scenario, the stray capacitance of each TVS tube to the ground cannot be ignored. Since the TVS device is in a high-resistance state below the breakdown voltage threshold, automatic balancing cannot be achieved, and a uA-level or mA-level, 10 mA-level current will be introduced due to the stray capacitance of each TVS device to the ground at high frequency and high voltage. When the TVS device frequently operates in a breakdown state and a large current flows through the TVS device, the TVS device will generate a high heat. The current flowing through the TVS device closer to the output end of the high-frequency and high-voltage power supply is larger, and the heat generated is more serious. In order to solve the problem, it is urgent to develop a TVS clamping circuit shielding method for a high-frequency and high-voltage application scenario. SUMMARY

[0004] The application accurately identifies the overload or overheating state of the TVS tube by collecting and analyzing the through current, self-temperature and other key operating parameters of the TVS tube in real time, initiatively starts the shunt of the parallel auxiliary circuit when the operating state approaches the set threshold, effectively reduces the instantaneous and continuous operating load of the TVS tube, globally compares and coordinates the operating state of the auxiliary circuit itself and the operating state of multiple voltage limiting units, actively balances the operating load between different voltage limiting units, significantly improves the dynamic response capability and reliability of the clamping circuit under high-frequency and high-voltage impact, enhances the protection effect of the core device, prolongs the service life of the circuit, and solves the problem that the TVS device cannot achieve automatic balancing and generates a high heat at high frequency and high voltage. The application provides a shielding control method and system of a clamping circuit for a high-frequency and high-voltage application scenario.

[0005] The purpose of the application can be achieved by the following technical scheme: a shielding control method of a clamping circuit for a high-frequency and high-voltage application scenario, comprising the following steps: Step 1: constructing a voltage limiting circuit comprising multiple TVS tubes, and arranging an auxiliary circuit in parallel with each TVS tube outside the TVS tube to form a corresponding group of voltage limiting units and auxiliary units; Step two: during the operation of the voltage limiting circuit, the passing current and the operating parameter of the temperature of each TVS tube are collected; Step three: according to the collected operating parameters of the TVS tube, the ratio of the current operating parameters of the TVS tube to the maximum allowable operating parameters is compared to obtain the overload state of the current operating TVS tube; Step four: when the operating state of the TVS tube approaches the set threshold, the auxiliary circuit is started to shunt the TVS tube to reduce the operating load of the TVS tube, and the control of the auxiliary circuit is enabled; Step five: the operating state of the plurality of auxiliary circuits is analyzed to judge the load state of the auxiliary circuit, and the opening and closing of the auxiliary circuit is controlled according to the judgment result; Step six: the plurality of TVS tubes and the corresponding auxiliary circuits are interactively controlled to balance the operating load of the plurality of units in the voltage limiting circuit.

[0006] Among them, the application also proposes a clamping circuit shielding control system for high-frequency high-voltage application scenarios, including a voltage limiting collection module, an auxiliary decision module, an auxiliary unit supervision module, a mixed comparison module and a load balancing control module; The voltage limiting collection module is used to collect the operating parameters of each voltage limiting unit in the voltage limiting circuit; The auxiliary decision module analyzes the threshold value according to the operating parameters of the voltage limiting unit, makes an auxiliary voltage limiting decision based on the threshold value judgment, and controls the auxiliary unit to shunt the corresponding voltage limiting unit; The auxiliary unit supervision module collects the operating parameters of the auxiliary unit after the auxiliary unit participates in the operation; The mixed comparison module simultaneously obtains the operating parameters of a group of corresponding auxiliary units and the operating parameters of the voltage limiting unit, compares the operating parameters of the auxiliary unit and the operating parameters of the voltage limiting unit, and makes a decision on the opening and closing of the auxiliary unit; The load balancing module obtains the operating parameters of a plurality of voltage limiting units in the voltage limiting circuit, compares the operating parameters of different voltage limiting units in the voltage limiting circuit, and makes an operating decision on the auxiliary units corresponding to different voltage limiting units according to the comparison result to balance the operating load of the voltage limiting unit.

[0007] As a preferred embodiment of the application, the operating parameters of the voltage limiting unit collected by the voltage limiting collection module include the passing current and the temperature itself, and the voltage limiting collection module sends the operating parameters of the voltage limiting unit to the auxiliary decision module after obtaining the operating parameters of the voltage limiting unit; The voltage limiting collection module also encodes each voltage limiting unit in the voltage limiting circuit to distinguish different voltage limiting units.

[0008] As a preferred embodiment of the present application, the auxiliary decision module judges the temperature of the voltage limiting unit after obtaining the operating parameters of the voltage limiting unit, and generates a high temperature signal when the temperature is too high; The auxiliary decision module generates a voltage limiting auxiliary signal after generating the high temperature signal, and starts the corresponding auxiliary unit through the voltage limiting auxiliary signal and the corresponding voltage limiting unit code, and the auxiliary unit is used to shunt the voltage limiting unit.

[0009] As a preferred embodiment of the present application, the auxiliary decision module performs threshold judgment on the passing current of the voltage limiting unit after obtaining the high temperature signal, and generates an overload signal if the passing current is greater than the set threshold, or generates an overheating signal if the passing current is not greater than the set threshold. The auxiliary decision module generates a device aging early warning reminder through the output display device after generating the overheating signal.

[0010] As a preferred embodiment of the present application, the operating parameters of the auxiliary unit collected by the auxiliary unit supervision module are resistance temperature, and the auxiliary unit supervision module sends the operating parameters of the auxiliary unit to the hybrid comparison module. The hybrid comparison module compares the resistance temperature with the set threshold after obtaining the resistance temperature, and generates a maintenance shunt signal if the resistance temperature is less than the set threshold, or generates a verification shunt signal if the resistance temperature is greater than the set threshold.

[0011] As a preferred embodiment of the present application, the hybrid comparison module calculates the over-limit rate of the temperature of the voltage limiting unit and the resistance temperature of the auxiliary unit respectively after generating the verification shunt signal, compares the over-limit rates, generates a maintenance shunt signal if the over-limit rate of the voltage limiting power supply is greater than the over-limit rate of the auxiliary unit, or generates a shutdown shunt signal if the over-limit rate of the voltage limiting power supply is less than the over-limit rate of the auxiliary unit. The over-limit rate is the ratio of the temperature or resistance temperature to the corresponding threshold.

[0012] As a preferred embodiment of the present application, the load balancing module calculates the over-limit rate of each voltage limiting unit after obtaining the operating parameters of multiple voltage limiting units, removes the voltage limiting unit with an over-limit rate less than 1, sorts the over-limit rates of the remaining voltage limiting units from high to low to obtain an auxiliary unit startup priority sequence, and starts the auxiliary units in sequence according to the auxiliary unit startup priority sequence for shunting.

[0013] Compared with the prior art, the present application has the following advantages: The application can accurately identify the overload or overheating state of the TVS tube by collecting and analyzing the through current, self temperature and other key operating parameters of the TVS tube in real time, and actively start the parallel auxiliary circuit for shunting when the operating state approaches the set threshold, effectively reduce the instantaneous and continuous operating load of the TVS tube, significantly improve the dynamic response capability and reliability of the clamping circuit under high-frequency high-voltage impact, enhance the protection effect of the core device, and prolong the service life of the circuit.

[0014] The application can not only intelligently judge the closing or maintenance of the auxiliary unit when the load of the auxiliary unit is too large, avoid the auxiliary circuit becoming a new fault point, but also can early warn the aging risk of the TVS tube when the TVS tube is only overheated but not overcurrent, realize the fine management and safety protection of the double states of the voltage limiting unit and the auxiliary unit.

[0015] The application can globally compare and plan the operating states of multiple voltage limiting units in the circuit, dynamically generate the startup priority sequence of the auxiliary unit according to the over-limit rate, realize the active balance of the operating load between different voltage limiting units, avoid the long-term high-load state of a single or local device, optimize the overall energy efficiency and heat distribution of the multi-path parallel clamping structure, and improve the stability and capacity redundancy of the system under high intensity and long period working. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to facilitate the understanding of those skilled in the art, the application will be further described below in conjunction with the drawings.

[0017] Figure 1 The system flowchart of the application is shown in the figure. Figure 2 The system block diagram of the application is shown in the figure. DETAILED DESCRIPTION

[0018] The technical solutions of the application will be described below in conjunction with the embodiments. Obviously, the described embodiments are only part of the embodiments of the application, not all the embodiments. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative labor belong to the protection scope of the application.

[0019] Embodiment one: please refer to Figure 1 - Figure 2 The shielding control method of the clamping circuit for high-frequency high-voltage application scene includes the following steps: Step one: build a voltage limiting circuit containing multiple TVS tubes, parallel a resistor to each TVS device, form an auxiliary circuit parallel to the TVS tube, form a corresponding set of voltage limiting units and auxiliary units, and make the TVS device voltage equalization when the power output is at a low frequency, then arrange metal plates near the TVS tube and connect them in series with a resistor to the high-frequency high-voltage power output terminal to solve the problem of TVS tube heating caused by stray capacitance; When the high-frequency high-voltage power supply is working normally, the peak voltage of the power output port is less than the total voltage of the TVS device in series, and if there is no stray capacitance between the TVS and the ground, the TVS device will not flow current; After adding the metal plate, the stray capacitance between the metal plates and the series resistance between the metal plates can make the potential of each metal plate basically equal to the output voltage of the high-frequency high-voltage power supply, and there is stray capacitance between each metal plate and the TVS device, which provides energy source for the stray capacitance between the TVS and the ground, so that the current flowing through the TVS can be greatly reduced; Step two: collect the running parameters of the current flowing through each TVS tube and its own temperature during the operation of the voltage limiting circuit; Step three: analyze the collected TVS tube running parameters, compare the ratio of the current TVS tube to the maximum allowed running parameter, and obtain the overload state of the current TVS tube; Step four: when the running state of the TVS tube approaches the set threshold, start the auxiliary circuit to shunt the TVS tube and reduce the running load of the TVS tube, while enabling the control of the auxiliary circuit; Step five: analyze the running state of multiple auxiliary circuits to determine the load state of the auxiliary circuit, and control the opening and closing of the auxiliary circuit according to the judgment result; Step six: interactively control multiple TVS tubes and corresponding auxiliary circuits to balance the running load of multiple units in the voltage limiting circuit.

[0020] Example two: please refer to Figure 1 - Figure 2 As shown in the figure, the clamping circuit shielding control system for high-frequency high-voltage application scenarios includes a voltage limiting collection module, an auxiliary decision module, an auxiliary unit supervision module, a hybrid comparison module, and a load balancing control module. The voltage limiting collection module is used to collect the running parameters of each voltage limiting unit in the voltage limiting circuit, and the collected running parameters of the voltage limiting unit include the current flowing through and the temperature of the voltage limiting unit. After obtaining the running parameters of the voltage limiting unit, the voltage limiting collection module sends the running parameters of the voltage limiting unit to the auxiliary decision module; The voltage limiting collection module also encodes each voltage limiting unit in the voltage limiting circuit to distinguish different voltage limiting units; The auxiliary decision module judges the temperature of the voltage limiting unit after threshold analysis based on the operating parameters of the voltage limiting unit, and generates a high temperature signal when the temperature is too high; After generating the high temperature signal, the auxiliary decision module generates a voltage limiting auxiliary signal, and starts the corresponding auxiliary unit through the voltage limiting auxiliary signal and the corresponding voltage limiting unit code, and the auxiliary unit is used to shunt the voltage limiting unit. The auxiliary decision module performs threshold judgment on the passing current of the voltage limiting unit after obtaining the high temperature signal, and generates an overload signal if the passing current is greater than the set threshold, or generates an overheat signal if the passing current is not greater than the set threshold. After generating the overheat signal, the auxiliary decision module generates a device aging early warning prompt through the output display device. The auxiliary unit supervision module collects the operating parameters of the auxiliary unit after the auxiliary unit participates in operation, and the operating parameters of the auxiliary unit collected are resistance temperature, and the auxiliary unit supervision module sends the operating parameters of the auxiliary unit to the mixed comparison module. The mixed comparison module obtains a group of operating parameters of the corresponding auxiliary unit and the operating parameters of the voltage limiting unit, and compares the resistance temperature with the set threshold after obtaining the resistance temperature. If the resistance temperature is less than the set threshold, a shunt maintenance signal is generated, and if the resistance temperature is greater than the set threshold, a shunt verification signal is generated. After the mixed comparison module generates the shunt verification signal, the self-temperature of the voltage limiting unit and the resistance temperature of the auxiliary unit are calculated respectively, and the over-limit rates are compared. If the over-limit rate of the voltage limiting power supply is greater than that of the auxiliary unit, a shunt maintenance signal is generated, and if the over-limit rate of the voltage limiting power supply is less than that of the auxiliary unit, a shunt closing signal is generated, so as to make a decision on the start and stop of the auxiliary unit. The over-limit rate is the ratio of the self-temperature or the resistance temperature to the corresponding threshold. The load balancing module obtains the operating parameters of a plurality of voltage limiting units in the voltage limiting circuit. After obtaining the operating parameters of the plurality of voltage limiting units, the load balancing module calculates the over-limit rate of each voltage limiting unit, and removes the voltage limiting unit with an over-limit rate less than 1. Then, the operating parameters of different voltage limiting units in the voltage limiting circuit are compared, the over-limit rates of the remaining voltage limiting units are sorted from high to low, and an auxiliary unit start priority sequence is obtained. The auxiliary units are started in sequence according to the auxiliary unit start priority sequence for shunting, so as to make a running decision on the auxiliary units corresponding to different voltage limiting units, balance the running load of the voltage limiting units, and improve the stability and anti-interference performance of the voltage limiting circuit and the auxiliary circuit during operation.

[0021] The threshold or the preset value, the preset range and the like are set for result comparison analysis so as to determine whether it is good or bad, and the size value is set according to the large model analysis of sample data and artificial experience, and is also adjusted according to the seasonal or reasonable influence condition. The weight proportion coefficient and the influence factor are set according to the influence of each parameter on the result, and the specific value is finally reflected on the influence of the result, and is also set according to the large model analysis of sample data and artificial experience, and is also adjusted according to the seasonal or reasonable influence condition.

[0022] The preferred embodiments of the present application disclosed above are only used to help explain the present application. The preferred embodiments do not describe all the details and limit the present application to the specific embodiments. Obviously, many modifications and variations can be made according to the content of the present application. The present application is selected and described in detail in order to better explain the principles and practical application of the present application, so that the skilled in the art can well understand and use the present application. The present application is limited by the claims and the entire scope and equivalents thereof.

Claims

1. A clamping circuit shielding control method for a high-frequency high-voltage application scenario, characterized in that, The method comprises the following steps: Step 1: constructing a voltage limiting circuit comprising a plurality of TVS tubes, and arranging an auxiliary circuit in parallel with each TVS tube outside the TVS tube to form a corresponding set of voltage limiting units and auxiliary units; Step 2: collecting the running parameters of the passing current and the temperature of each TVS tube during the operation of the voltage limiting circuit; Step 3: analyzing the collected TVS tube running parameters, comparing the ratio of the current TVS tube to the maximum allowable running parameter, and obtaining the overload state of the current TVS tube; Step 4: when the running state of the TVS tube approaches the set threshold, starting the auxiliary circuit to shunt the TVS tube and reduce the running load of the TVS tube, while enabling the control of the auxiliary circuit; Step 5: analyzing the running state of the plurality of auxiliary circuits to determine the load state of the auxiliary circuit, and controlling the opening and closing of the auxiliary circuit according to the judgment result; Step 6: interactive control of the plurality of TVS tubes and the corresponding auxiliary circuits to balance the running load of the plurality of units in the voltage limiting circuit.

2. The clamping circuit shielding control system for high-frequency high-voltage application scenarios, applied to the clamping circuit shielding control method for high-frequency high-voltage application scenarios as claimed in claim 1, characterized in that, The method comprises a voltage limiting collection module, an auxiliary decision module, an auxiliary unit supervision module, a mixed comparison module, and a load balancing control module; The voltage limiting collection module is used to collect the running parameters of each voltage limiting unit in the voltage limiting circuit; The auxiliary decision module analyzes the threshold value based on the running parameters of the voltage limiting unit, makes an auxiliary voltage limiting decision based on the threshold value judgment, and controls the auxiliary unit to shunt the corresponding voltage limiting unit; The auxiliary unit supervision module collects the running parameters of the auxiliary unit after the auxiliary unit participates in the operation; The mixed comparison module simultaneously obtains the running parameters of a corresponding set of auxiliary units and the running parameters of the voltage limiting unit, compares the running parameters of the auxiliary unit and the running parameters of the voltage limiting unit, and makes a decision on the opening and closing of the auxiliary unit; The load balancing module obtains the running parameters of a plurality of voltage limiting units in the voltage limiting circuit, compares the running parameters of different voltage limiting units in the voltage limiting circuit, and makes a running decision on the auxiliary units corresponding to different voltage limiting units based on the comparison result to balance the running load of the voltage limiting unit.

3. The clamping circuit shielding control system for high frequency and high voltage application scenario according to claim 2, characterized in that, The running parameters of the voltage limiting unit collected by the voltage limiting collection module include the passing current and the temperature, and the voltage limiting collection module sends the running parameters of the voltage limiting unit to the auxiliary decision module after obtaining the running parameters of the voltage limiting unit; The voltage limiting collection module also encodes each voltage limiting unit in the voltage limiting circuit to distinguish different voltage limiting units.

4. The clamping circuit shielding control system for high-frequency and high-voltage application scenarios according to claim 2, characterized in that, The auxiliary decision module judges the temperature of the voltage limiting unit after obtaining the running parameters of the voltage limiting unit, and generates a high-temperature signal when the temperature is too high; The auxiliary decision module generates a voltage limiting auxiliary signal after generating the high-temperature signal, and starts the corresponding auxiliary unit through the voltage limiting auxiliary signal and the corresponding voltage limiting unit code to shunt the voltage limiting unit through the auxiliary unit.

5. The clamping circuit shielding control system for high frequency and high voltage application scenario according to claim 4, characterized in that, The auxiliary decision module makes a threshold judgment on the passing current of the voltage limiting unit after obtaining the high-temperature signal, generates an overload signal if the passing current is greater than the set threshold, or generates an overheating signal if the passing current is not greater than the set threshold. The auxiliary decision module generates a device aging early warning reminder through an output display device after generating the overheating signal.

6. The clamping circuit shielding control system for high frequency and high voltage application scenario according to claim 2, characterized in that, The auxiliary unit supervision module collects the operating parameters of the auxiliary unit, and the operating parameters of the auxiliary unit are sent to the mixed comparison module. The mixed comparison module compares the resistance temperature with the set threshold value after obtaining the resistance temperature, and generates a maintenance shunt signal if the resistance temperature is less than the set threshold value, or generates a verification shunt signal if the resistance temperature is greater than the set threshold value.

7. The clamping circuit shielding control system for high frequency and high voltage application scenario according to claim 6, characterized in that, The mixed comparison module calculates the over-limit rate of the temperature of the voltage limiting unit and the resistance temperature of the auxiliary unit respectively after generating the verification shunt signal, compares the over-limit rates, generates a maintenance shunt signal if the over-limit rate of the voltage limiting power supply is greater than the over-limit rate of the auxiliary unit, or generates a shutdown shunt signal if the over-limit rate of the voltage limiting power supply is less than the over-limit rate of the auxiliary unit. The over-limit rate is the ratio of the temperature or resistance temperature to the corresponding threshold value.

8. The clamping circuit shielding control system for high frequency and high voltage application scenario according to claim 2, characterized in that, The load balancing module calculates the over-limit rate of each voltage limiting unit after obtaining the operating parameters of the multiple voltage limiting units, eliminates the voltage limiting units with an over-limit rate less than 1, sorts the over-limit rates of the remaining voltage limiting units from high to low to obtain an auxiliary unit startup priority sequence, and starts the auxiliary units in sequence according to the auxiliary unit startup priority sequence for shunting.

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