High-voltage pulse suppression circuit, device and method

Abstract

The invention relates to a high-voltage pulse suppression circuit, device and method. The suppression circuit comprises a high-voltage pulse suppression module, a feedback control module and a driving module. The high-voltage pulse suppression module is used for consuming high-voltage pulses; the feedback control module is used for outputting a first control signal and outputting a second control signal; the driving module is used for controlling the high-voltage pulse suppression module to cut off the connection between the external power supply module and the external load according to the first control signal; and the control module is used for controlling the high-voltage pulse suppression module to conduct the external power supply module and the external load according to the second control signal. The connection between the external power supply module and the external load is cut off through the high-voltage pulse suppression module, the external load is prevented from being damaged by the high-voltage pulse, and the high-voltage pulse is consumed through the high-voltage pulse suppression module, so that the high-voltage pulse is prevented from still existing after the external power supply module is reconnected with the external load. The suppression of the high-voltage pulse is realized, and the stability of the power supply network is maintained.

Description

Technical Field

[0001] The present disclosure relates to the technical field of circuit protection, and particularly to a high-voltage pulse suppression circuit, device and method. Background Art

[0002] With the rapid development of electric vehicles, in order to meet the power improvement requirements of vehicle loads, most vehicle manufacturers have upgraded the 12V low-voltage power supply system to a 48V medium-voltage power supply system to increase power by increasing the voltage. In the 48V power supply system, some existing vehicle components can work normally under the 48V power supply system, but cannot work under the high-voltage pulse of the 48V power supply system. Therefore, how to suppress high-voltage pulses to obtain a more stable power network has become a technical problem that needs to be solved urgently by those skilled in the art. Summary of the Invention

[0003] In order to solve the above technical problems or at least partially solve the above technical problems, the present disclosure provides a high-voltage pulse suppression circuit, device and method.

[0004] The present disclosure provides a high-voltage pulse suppression circuit, including: a high-voltage pulse suppression module, a feedback control module, and a drive module. The external power supply module is electrically connected to the external load through the high-voltage pulse suppression module, and the high-voltage pulse suppression module is used to consume high-voltage pulses; the feedback control module is electrically connected to the input end and the output end of the high-voltage pulse suppression module, and the feedback control module is used to output a first control signal according to the voltage value at the input end being greater than a first voltage threshold and the voltage value at the output end being greater than a second voltage threshold; the feedback control module is further used to output a second control signal according to the voltage value at the input end being greater than the first voltage threshold and the voltage value at the output end being less than a third voltage threshold; the drive module is electrically connected to the control end of the high-voltage pulse suppression module, and the drive module is used to control the high-voltage pulse suppression module to cut off the connection between the external power supply module and the external load according to the first control signal; and to control the high-voltage pulse suppression module to conduct the connection between the external power supply module and the external load according to the second control signal; wherein, the first voltage threshold is greater than the upper limit voltage value of the external load for normal operation; the second voltage threshold is greater than the lower limit voltage value of the external load for normal operation and less than the upper limit voltage value; the third voltage threshold is greater than the lower limit voltage value and less than the upper limit voltage value, and the second voltage threshold is greater than the third voltage threshold.

[0005] Optionally, the high-voltage pulse suppression module includes a switch unit and a voltage stabilizing capacitor; the control end of the switch unit is electrically connected to the drive module, the external power supply module is electrically connected to the first end of the switch unit, and the second end of the switch unit is electrically connected to the external load; the second end of the switch unit is also grounded through the voltage stabilizing capacitor.

[0006] Optionally, the switch unit includes: a first NMOS transistor and a second NMOS transistor; the gates of the first NMOS transistor and the second NMOS transistor are both electrically connected to the driving module, the drain of the first NMOS transistor is electrically connected to the external power supply module, the source of the first NMOS transistor is electrically connected to the source of the second NMOS transistor, and the drain of the second NMOS transistor is electrically connected to the external load.

[0007] Optionally, the suppression circuit further includes an overheat protection unit; the overheat protection unit is electrically connected to the control terminal of the high-voltage pulse suppression module, and the overheat protection unit is configured to detect the operating temperature of the high-voltage pulse suppression module, and based on the operating temperature being greater than the temperature threshold, control the high-voltage pulse suppression module to cut off the connection between the external power supply module and the external load.

[0008] Optionally, the suppression circuit further includes an overvoltage protection unit; the overvoltage protection unit is electrically connected to the control terminal of the high-voltage pulse suppression module, and the overvoltage protection unit is configured to detect the operating voltage of the high-voltage pulse suppression module, and based on the operating voltage being greater than the fourth voltage threshold, control the high-voltage pulse suppression module to cut off the connection between the external power supply module and the external load; wherein, the fourth voltage threshold is greater than the voltage upper limit value and less than the withstand voltage value of the external load.

[0009] Optionally, the suppression circuit further includes an electrostatic protection unit; the input end of the high-voltage pulse suppression module is grounded through the electrostatic protection unit.

[0010] The present disclosure also provides a high-voltage pulse suppression device, including any of the above high-voltage pulse suppression circuits.

[0011] The present disclosure also provides a high-voltage pulse suppression method, which is applied to the above high-voltage pulse suppression device, and the suppression method includes: obtaining the voltage value of the input end and the voltage value of the output end; based on the voltage value of the input end being greater than the first voltage threshold and the voltage value of the output end being greater than the second voltage threshold, controlling the driving module to disconnect the high-voltage pulse suppression module.

[0012] Optionally, after controlling the driving module to disconnect the high-voltage pulse suppression module based on the voltage value of the input end being greater than the first voltage threshold and the voltage value of the output end being greater than the second voltage threshold, the suppression method further includes: based on the voltage value of the input end being greater than the first voltage threshold and the voltage value of the output end being less than the third voltage threshold, controlling the driving module to conduct the high-voltage pulse suppression module.

[0013] Optionally, the suppression method further includes: based on the voltage value of the input end being less than the first voltage threshold, controlling the driving module to conduct the high-voltage pulse suppression module.

[0014] The present disclosure provides a high-voltage pulse suppression circuit, device and method. The high-voltage pulse suppression circuit includes a high-voltage pulse suppression module, a feedback control module and a drive module. An external power supply module is electrically connected to an external load through the high-voltage pulse suppression module. The external power supply module outputs a voltage to the external load through the high-voltage pulse suppression module. The feedback control module is electrically connected to the input end and the output end of the high-voltage pulse suppression module respectively, so as to detect the voltage value at the input end and the voltage value at the output end. When the voltage value at the input end is greater than a first voltage threshold and the voltage value at the output end is greater than a second voltage threshold, it is determined that the external power supply module is outputting a high-voltage pulse. The feedback control module outputs a first control signal to the drive module. The drive module controls the high-voltage pulse suppression module to cut off the connection between the external power supply module and the external load according to the first control signal. The high-voltage pulse suppression module and the external load jointly consume the voltage at the output end. The feedback control module continuously detects the voltage value at the input end and the voltage value at the output end during this process. When the voltage at the output end is less than a third voltage threshold, it is determined that the consumption of the voltage at the output end has been completed, and at this time the voltage at the input end is still greater than the first voltage threshold, then the high-voltage pulse has not been completely consumed. The feedback control module outputs a second control signal to the drive module. The drive module controls the high-voltage pulse suppression module to conduct the connection between the external power supply module and the external load according to the second control signal, so that the voltage at the output end rises again. If the voltage value at the input end is greater than the first voltage threshold and the voltage value at the output end is greater than the second voltage threshold at this time, the connection between the external power supply module and the external load is cut off again to consume the voltage at the output end. The above steps are repeatedly executed until the high-voltage pulse is completely consumed. The drive module controls the high-voltage pulse suppression module to continuously conduct the connection between the external power supply module and the external load. Thus, by repeatedly consuming the high-voltage pulse multiple times, the suppression of the high-voltage pulse is achieved, avoiding damage to the external load due to the high-voltage pulse, and at the same time maintaining the stability of the power network. Description of the Drawings

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required to be used in the embodiments of the present application will be 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 efforts.

[0016] Figure 1 It is a schematic structural diagram of a high-voltage pulse suppression circuit provided by an embodiment of the present disclosure.

[0017] Figure 2 It is a schematic structural diagram of a preferred high-voltage pulse suppression circuit provided by an embodiment of the present disclosure.

[0018] Figure 3Schematic flowchart of a method for suppressing high-voltage pulses provided by an embodiment of the present disclosure. Detailed implementation manners

[0019] The features and exemplary embodiments of various aspects of the present application will be described in detail below. In the following detailed description, many specific details are set forth in order to provide a thorough understanding of the present application. However, it will be apparent to those skilled in the art that the present application may be practiced without some of these specific details. The following description of the embodiments is only intended to provide a better understanding of the present application by showing examples of the present application.

[0020] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments may be combined with each other. The embodiments will be described in detail below with reference to the drawings.

[0021] Figure 1 Schematic structural diagram of a high-voltage pulse suppression circuit provided by an embodiment of the present disclosure, as Figure 1 shown, the suppression circuit includes: a high-voltage pulse suppression module 100, a feedback control module 200, and a driving module 300.

[0022] The external power supply module 410 is electrically connected to the external load 420 through the high-voltage pulse suppression module 100, and the high-voltage pulse suppression module 100 is used to consume high-voltage pulses. The feedback control module 200 is electrically connected to the input terminal 101 and the output terminal 102 of the high-voltage pulse suppression module 100. The feedback control module 200 is configured to output a first control signal according to the voltage value of the input terminal 101 being greater than a first voltage threshold and the voltage value of the output terminal 102 being greater than a second voltage threshold; the feedback control module 200 is further configured to output a second control signal according to the voltage value of the input terminal 101 being greater than the first voltage threshold and the voltage value of the output terminal 102 being less than a third voltage threshold.

[0023] Specifically, the first voltage threshold is greater than the upper limit value of the voltage at which the external load 420 operates normally; the second voltage threshold is greater than the lower limit value of the voltage at which the external load 420 operates normally and less than the upper limit value; the third voltage threshold is greater than the lower limit value and less than the upper limit value, and the second voltage threshold is greater than the third voltage threshold. The external power supply module 410 outputs voltage to the external load 420 through the high-voltage pulse suppression module 100. Therefore, by detecting the voltage value at the input terminal 101 of the high-voltage pulse module 100, it can be determined whether the external power supply module 410 is outputting high-voltage pulses. The feedback control module 200 is electrically connected to the input terminal 101 and the output terminal 102 of the high-voltage pulse suppression module 100 respectively, and realizes the detection of the voltage value at the input terminal 101 and the voltage value at the output terminal 102 through the feedback control module 200. When the voltage value at the input terminal 101 is greater than the first voltage threshold and the voltage value at the output terminal 102 is greater than the second voltage threshold, it is determined that the external power supply module 410 is outputting high-voltage pulses, and the feedback control module 200 outputs a first control signal to the drive module 300. The high-voltage pulse suppression module 100 and the external load 420 can jointly consume the voltage at the output terminal 102. Therefore, when the voltage value at the output terminal 102 is less than the third voltage threshold, it is determined that the consumption of the voltage at the output terminal 102 has been completed, and the voltage at the input terminal 101 is still greater than the first voltage threshold, and the high-voltage pulses output by the external power supply module 410 have not been completely consumed. The feedback control module 200 outputs a second control signal to the drive module 300.

[0024] The drive module 300 is electrically connected to the control terminal 103 of the high-voltage pulse suppression module 100. The drive module 300 is used to control the high-voltage pulse suppression module 100 to cut off the connection between the external power supply module 410 and the external load 420 according to the first control signal; and is used to control the high-voltage pulse suppression module 100 to conduct the connection between the external power supply module 410 and the external load 420 according to the second control signal.

[0025] Specifically, the driving module 300 controls the high-voltage pulse suppression module 100 to cut off the connection between the external power supply module 410 and the external load 420 according to the first control signal. The high-voltage pulse suppression module 100 and the external load 420 jointly consume the voltage at the output end 102. During this process, the feedback control module 200 continuously detects the voltage value at the input end 101 and the voltage value at the output end 102. When the voltage at the output end 102 is less than the third voltage threshold, it is determined that the consumption of the voltage at the output end 102 has been completed, and at this time, the voltage at the input end 101 is still greater than the first voltage threshold, indicating that the high-voltage pulse has not been completely consumed. The feedback control module 200 outputs a second control signal to the driving module 300, and the driving module 300 controls the high-voltage pulse suppression module 100 to conduct the external power supply module 410 and the external load 420 according to the second control signal. At this time, the voltage at the output end 102 rises again.

[0026] If the voltage value at the output end 102 rises and is greater than the second voltage threshold, and the voltage value at the input end 101 is still greater than the first voltage threshold, it means that the high-voltage pulse has not been completely consumed. The feedback control module 200 generates the first control signal again, and the driving module 300 cuts off the connection between the external power supply module 410 and the external load 420 according to the first control signal. The high-voltage pulse suppression module 100 and the external load 420 consume the voltage at the output end 102 again. The above steps are repeatedly executed until the high-voltage pulse output by the external power supply module 410 is completely consumed. At this time, the voltage value at the input end 101 is less than the first voltage threshold, and the feedback control module 200 controls the driving module 300 to keep the high-voltage pulse suppression module 100 conducting the external power supply module 410 and the external load 420. Thus, through repeatedly consuming the high-voltage pulse multiple times, the present disclosure realizes the suppression of the high-voltage pulse, avoids damage to the external load 420 due to the high-voltage pulse, and at the same time maintains the stability of the power network.

[0027] In some embodiments, the high-voltage pulse suppression module includes a switching unit and a voltage stabilizing capacitor; the control end of the switching unit is electrically connected to the driving module, the external power supply module is electrically connected to the first end of the switching unit, and the second end of the switching unit is electrically connected to the external load; the second end of the switching unit is also grounded through the voltage stabilizing capacitor.

[0028] Specifically, during the period when the external power supply module normally supplies power to the external load, the switching unit remains in the conducting state, and the external power supply module outputs voltage to the external load through the switching unit. Therefore, by detecting the voltage value at the first end of the switching unit, it can be determined whether the external power supply module is outputting a high-voltage pulse. The feedback control module is electrically connected to the first end and the second end of the switching unit respectively, and realizes the detection of the voltage value at the first end and the voltage value at the second end through the feedback control module. When the voltage value at the first end is greater than the first voltage threshold and the voltage value at the second end is greater than the second voltage threshold, it is determined that the external power supply module is outputting a high-voltage pulse, and the feedback control module outputs a first control signal to the driving module. The driving module controls the switching unit to disconnect according to the first control signal, cuts off the connection between the external power supply module and the external load, and the second end of the switching unit charges the voltage stabilizing capacitor. The voltage stabilizing capacitor can not only achieve voltage stabilization but also consume the voltage at the second end, so as to realize that the voltage stabilizing capacitor and the external load jointly consume the voltage at the second end.

[0029] During the process of consuming the voltage at the second end, when the voltage value at the second end is less than the third voltage threshold, it is determined that the consumption of the voltage at the second end has been completed, and the voltage at the first end is still greater than the first voltage threshold. Then, the high-voltage pulse output by the external power supply module has not been completely consumed. The feedback control module outputs a second control signal to the driving module, and the driving module controls the switching unit to conduct according to the second control signal, so that the external power supply module is connected to the external load, and at this time, the voltage at the second end rises again.

[0030] If the voltage value at the second end is greater than the second voltage threshold after rising, and the voltage value at the first end is still greater than the first voltage threshold, then the high-voltage pulse has not been completely consumed. The feedback control module generates the first control signal again, and the driving module controls the switching unit to disconnect according to the first control signal, cuts off the connection between the external power supply module and the external load, and the voltage stabilizing capacitor and the external load consume the voltage at the second end again. The above steps are repeatedly executed until the high-voltage pulse output by the external power supply module is completely consumed. At this time, the voltage value at the first end is less than the first voltage threshold, and the feedback control module controls the driving module to continuously conduct the external power supply module and the external load through the switching unit. Thus, the present disclosure realizes the suppression of the high-voltage pulse by repeatedly consuming the high-voltage pulse many times, avoids the damage of the external load due to the high-voltage pulse, and at the same time maintains the stability of the power network.

[0031] In some embodiments, the switching unit includes: a first NMOS transistor and a second NMOS transistor; the gates of the first NMOS transistor and the second NMOS transistor are both electrically connected to the driving module, the drain of the first NMOS transistor is electrically connected to the external power supply module, the source of the first NMOS transistor is electrically connected to the source of the second NMOS transistor, and the drain of the second NMOS transistor is electrically connected to the external load.

[0032] Specifically, during the normal power supply of the external power supply module to the external load, both the first NMOS transistor and the second NMOS transistor are kept in the conducting state. The external power supply module outputs voltage to the external load through the first NMOS transistor and the second NMOS transistor. Therefore, by detecting the voltage value at the drain of the first NMOS transistor, it can be determined whether the external power supply module is outputting a high-voltage pulse. The feedback control module is electrically connected to the drain of the first NMOS transistor and the drain of the second NMOS transistor respectively, and realizes the detection of the voltage value at the drain of the first NMOS transistor and the voltage value at the drain of the second NMOS transistor through the feedback control module. When the voltage value at the drain of the first NMOS transistor is greater than the first voltage threshold and the voltage value at the drain of the second NMOS transistor is greater than the second voltage threshold, it is determined that the external power supply module is outputting a high-voltage pulse. The feedback control module outputs a first control signal to the drive module, and the drive module controls both the first NMOS transistor and the second NMOS transistor to turn off according to the first control signal, cutting off the connection between the external power supply module and the external load, and the drain of the second NMOS transistor charges the voltage stabilizing capacitor.

[0033] During the process of consuming the voltage at the drain of the second NMOS transistor, when the voltage value at the drain of the second NMOS transistor is less than the third voltage threshold, it is determined that the consumption of the voltage at the drain of the second NMOS transistor has been completed, and the voltage at the drain of the first NMOS transistor is still greater than the first voltage threshold. Then, the high-voltage pulse output by the external power supply module has not been completely consumed. The feedback control module outputs a second control signal to the drive module, and the drive module controls the first NMOS transistor and the second NMOS transistor to conduct according to the second control signal, connecting the external power supply module and the external load. At this time, the voltage at the drain of the second NMOS transistor rises again.

[0034] If the voltage value at the drain of the second NMOS transistor increases and is greater than the second voltage threshold, and the voltage value at the drain of the first NMOS transistor is still greater than the first voltage threshold, the high-voltage pulse has not been completely consumed. The feedback control module generates the first control signal again, and the driving module controls the first NMOS transistor and the second NMOS transistor to turn off according to the first control signal, cutting off the connection between the external power supply module and the external load. The voltage stabilizing capacitor and the external load consume the voltage at the second terminal again, and the above steps are repeatedly executed until the high-voltage pulse output by the external power supply module is completely consumed. At this time, the voltage value at the drain of the first NMOS transistor is less than the first voltage threshold, and the feedback control module controls the driving module to keep the first NMOS transistor and the second NMOS transistor continuously conducting the external power supply module and the external load. Thus, the present disclosure realizes the suppression of the high-voltage pulse by repeatedly consuming the high-voltage pulse multiple times, avoiding damage to the external load due to the high-voltage pulse, and at the same time maintaining the stability of the power network. And the first NMOS transistor and the second NMOS transistor are connected in series back-to-back. Through the body diodes inside the first NMOS transistor and the second NMOS transistor, when both the first NMOS transistor and the second NMOS transistor are turned off, the current in the circuit is cut off bidirectionally, avoiding the voltage provided by the external power supply module from leaking to the drain of the second NMOS transistor, thus preventing the problem that the drain voltage of the second NMOS transistor cannot be completely consumed.

[0035] In some embodiments, the suppression circuit further includes an overheat protection unit; the overheat protection unit is electrically connected to the control terminal of the high-voltage pulse suppression module, and the overheat protection unit is configured to detect the operating temperature of the high-voltage pulse suppression module, and based on the operating temperature being greater than the temperature threshold, control the high-voltage pulse suppression module to cut off the connection between the external power supply module and the external load.

[0036] Specifically, the overheat protection unit detects the operating temperature of the high-voltage pulse suppression module. When it detects that the operating temperature is greater than the temperature threshold, it is considered that there is more heat generation in the suppression circuit, and the high-voltage pulse suppression module is controlled to cut off the connection between the external power supply module and the external load, avoiding the high-voltage pulse suppression module from being burned out when operating in a high-temperature environment.

[0037] In some embodiments, the suppression circuit further includes an overvoltage protection unit; the overvoltage protection unit is electrically connected to the control terminal of the high-voltage pulse suppression module, and the overvoltage protection unit is configured to detect the operating voltage of the high-voltage pulse suppression module, and based on the operating voltage being greater than the fourth voltage threshold, control the high-voltage pulse suppression module to cut off the connection between the external power supply module and the external load; wherein, the fourth voltage threshold is greater than the voltage upper limit value and less than the withstand voltage value of the external load.

[0038] Specifically, the overvoltage protection unit detects the operating voltage of the high-voltage pulse suppression module. Since the fourth voltage threshold is greater than the upper limit of the normal operating voltage of the external load, the overvoltage detection process of the overvoltage protection unit will not interfere with the detection and suppression process of the high-voltage pulse by the suppression circuit, and the fourth voltage threshold is less than the withstand voltage value of the external load, so that the external load will not be damaged due to excessive voltage. When it is detected that the operating voltage is greater than the fourth voltage threshold, it is considered that the voltage in the suppression circuit is too high and unstable, and there is a possibility of damaging the external load. The overvoltage protection unit controls the high-voltage pulse suppression module to cut off the connection between the external power supply module and the external load, avoiding damage to the external load due to operating in an overvoltage environment.

[0039] In some embodiments, the suppression circuit further includes an electrostatic protection unit; the input end of the high-voltage pulse suppression module is grounded through the electrostatic protection unit.

[0040] Exemplarily, the electrostatic protection unit can be, for example, an electrostatic protection capacitor. The input end of the high-voltage pulse suppression module is grounded through the electrostatic protection capacitor. The electrostatic protection capacitor can absorb the electrostatic energy existing at the input end of the high-voltage pulse suppression module, thereby avoiding the impact of the electrostatic energy on the components in the suppression circuit and protecting the safe use of the suppression circuit.

[0041] It should be noted that the electrostatic protection unit can also be other devices that can achieve electrostatic protection other than the electrostatic protection capacitor, and no specific limitation is made here again.

[0042] Figure 2 As shown in the structural schematic diagram of a preferred high-voltage pulse suppression circuit provided by an embodiment of the present disclosure, Figure 2 as shown, the suppression circuit includes: a first NMOS transistor Q1, a second NMOS transistor Q2, a voltage stabilizing capacitor C1, an overheat protection unit 510, an overvoltage protection unit 520, an electrostatic protection capacitor C2, a current limiting resistor R1, a feedback control module 200, and a driving module 300.

[0043] The drain of the first NMOS transistor Q1 is electrically connected to the external power supply module 410. The source of the first NMOS transistor Q1 is electrically connected to the source of the second NMOS transistor Q2. The drain of the second NMOS transistor Q2 is electrically connected to the external load 420. The drain of the first NMOS transistor Q1 is also grounded through the electrostatic protection capacitor C2. The feedback control module 200 is electrically connected to the drain of the first NMOS transistor Q1 and the drain of the second NMOS transistor Q2 respectively. The feedback control module 200 is electrically connected to the drive module 300. The drive module 300 is electrically connected to the gate of the first NMOS transistor Q1 and the gate of the second NMOS transistor Q2 through the current limiting resistor R1. The drain of the second NMOS transistor Q2 is also grounded through the voltage stabilizing capacitor C1. The overheat protection unit 510 and the overvoltage protection unit 520 are both electrically connected to the gate of the first NMOS transistor Q1 and the gate of the second NMOS transistor Q2.

[0044] Specifically, during the normal power supply of the external power supply module 410 to the external load 420, both the first NMOS transistor Q1 and the second NMOS transistor Q2 are kept in the conducting state. The external power supply module 410 outputs voltage to the external load 420 through the first NMOS transistor Q1 and the second NMOS transistor Q2. Therefore, by detecting the voltage value of the drain of the first NMOS transistor Q1, it can be determined whether the external power supply module 410 is outputting high-voltage pulses. The feedback control module 200 is electrically connected to the drain of the first NMOS transistor Q1 and the drain of the second NMOS transistor Q2 respectively, and the detection of the voltage value of the drain of the first NMOS transistor Q1 and the voltage value of the drain of the second NMOS transistor Q2 is realized through the feedback control module 200. When the voltage value of the drain of the first NMOS transistor Q1 is greater than the first voltage threshold, and the voltage value of the drain of the second NMOS transistor Q2 is greater than the second voltage threshold, it is determined that the external power supply module 410 is outputting high-voltage pulses. The feedback control module 200 outputs a first control signal to the drive module 300, and the drive module 300 controls both the first NMOS transistor Q1 and the second NMOS transistor Q2 to turn off according to the first control signal, cutting off the connection between the external power supply module 410 and the external load 420, and the drain of the second NMOS transistor Q2 charges the voltage stabilizing capacitor C1.

[0045] During the process of consuming the voltage at the drain of the second NMOS transistor Q2, when the voltage value at the drain of the second NMOS transistor Q2 is less than the third voltage threshold, it is determined that the consumption of the voltage at the drain of the second NMOS transistor Q2 has been completed, and the voltage at the drain of the first NMOS transistor Q1 is still greater than the first voltage threshold. Then, the high-voltage pulse output by the external power supply module 410 has not been completely consumed. The feedback control module 200 outputs a second control signal to the drive module 300. The drive module 300 controls the first NMOS transistor Q1 and the second NMOS transistor Q2 to conduct according to the second control signal, so that the external power supply module 410 is connected to the external load 420. At this time, the voltage at the drain of the second NMOS transistor Q2 rises again.

[0046] If the voltage value at the drain of the second NMOS transistor Q2 rises and is greater than the second voltage threshold, and the voltage value at the drain of the first NMOS transistor Q1 is still greater than the first voltage threshold, then the high-voltage pulse has not been completely consumed. The feedback control module 200 generates the first control signal again. The drive module 300 controls the first NMOS transistor Q1 and the second NMOS transistor Q2 to disconnect according to the first control signal, cutting off the connection between the external power supply module 410 and the external load 420. The voltage stabilizing capacitor C1 and the external load 420 consume the voltage at the second terminal again. The above steps are repeatedly executed until the high-voltage pulse output by the external power supply module 410 is completely consumed. At this time, the voltage value at the drain of the first NMOS transistor Q1 is less than the first voltage threshold. The feedback control module 200 controls the drive module 300 to continuously conduct the external power supply module 410 and the external load 420 through the first NMOS transistor Q1 and the second NMOS transistor Q2. Thus, the present disclosure realizes the suppression of the high-voltage pulse by repeatedly consuming the high-voltage pulse many times, avoiding damage to the external load 420 due to the high-voltage pulse, and at the same time maintaining the stability of the power network. And the first NMOS transistor Q1 and the second NMOS transistor Q2 are connected in series back-to-back. Through the body diodes inside the first NMOS transistor Q1 and the second NMOS transistor Q2, when both the first NMOS transistor Q1 and the second NMOS transistor Q2 are disconnected, the current in the circuit is cut off bidirectionally, avoiding the voltage provided by the external power supply module 410 from leaking to the drain of the second NMOS transistor Q2, thus preventing the problem that the drain voltage of the second NMOS transistor Q2 cannot be completely consumed.

[0047] The overheat protection unit 510 detects the operating temperatures of the first NMOS transistor Q1 and the second NMOS transistor Q2. When it detects that the operating temperature is greater than the temperature threshold, it is considered that there is more heat generation in the suppression circuit, and it controls both the first NMOS transistor Q1 and the second NMOS transistor Q2 to disconnect, cutting off the connection between the external power supply module 410 and the external load 420, avoiding the first NMOS transistor Q1 and the second NMOS transistor Q2 from being burned out when operating in a high-temperature environment.

[0048] The overvoltage protection unit 520 detects the operating voltages of the first NMOS transistor Q1 and the second NMOS transistor Q2. When it detects that the operating voltage is greater than the fourth voltage threshold, it is considered that the voltage in the suppression circuit is too high and unstable, and there is a possibility of damaging the external load 420. The overvoltage protection unit 520 controls the first NMOS transistor Q1 and the second NMOS transistor Q2 to turn off, cutting off the connection between the external power supply module 410 and the external load 420, and preventing the external load 420 from being damaged due to operating in an overvoltage environment.

[0049] The drain of the first NMOS transistor Q1 is grounded through the electrostatic protection capacitor C2. The electrostatic protection capacitor C2 can absorb the electrostatic energy existing at the drain of the first NMOS transistor Q1, thereby preventing the electrostatic energy from impacting the components in the suppression circuit and protecting the safe use of the suppression circuit.

[0050] The embodiment of the present disclosure also provides a high-voltage pulse suppression device, including the high-voltage pulse suppression circuit described in any of the above embodiments.

[0051] It can be understood that the high-voltage pulse suppression device provided by the embodiment of the present disclosure can achieve the corresponding beneficial effects of any one of the high-voltage pulse suppression circuits provided by the above embodiments, which will not be elaborated here.

[0052] Figure 3 It is a schematic flowchart of a high-voltage pulse suppression method provided by an embodiment of the present disclosure. The suppression method is applied to the above high-voltage pulse suppression device, as Figure 3 shown, the suppression method includes: S610 and S620.

[0053] S610: Obtain the voltage value at the input end and the voltage value at the output end. S620: Based on the voltage value at the input end being greater than the first voltage threshold and the voltage value at the output end being greater than the second voltage threshold, control the drive module to disconnect the high-voltage pulse suppression module.

[0054] Specifically, the external power supply module outputs voltage to the external load through the high-voltage pulse suppression module. Therefore, by detecting the voltage value at the input end of the high-voltage pulse module, it can be determined whether the external power supply module is outputting high-voltage pulses. The feedback control module is electrically connected to the input end and the output end of the high-voltage pulse suppression module respectively, and the detection of the voltage value at the input end and the voltage value at the output end is achieved through the feedback control module. When the voltage value at the input end is greater than the first voltage threshold and the voltage value at the output end is greater than the second voltage threshold, it is determined that the external power supply module is outputting high-voltage pulses. The feedback control module controls the drive module to disconnect the high-voltage pulse suppression module, thereby cutting off the connection between the external power supply module and the external load, and preventing the high-voltage pulses of the external power supply module from being directly output to the external load, avoiding the problem of damage to the external load.

[0055] In some embodiments, after controlling the driving module to disconnect the high-voltage pulse suppression module based on the voltage value at the input terminal being greater than the first voltage threshold and the voltage value at the output terminal being greater than the second voltage threshold, the method further includes: controlling the driving module to turn on the high-voltage pulse suppression module based on the voltage value at the input terminal being greater than the first voltage threshold and the voltage value at the output terminal being less than the third voltage threshold.

[0056] Specifically, the high-voltage pulse suppression module and the external load can jointly consume the voltage at the output terminal. Therefore, when the voltage value at the output terminal is less than the third voltage threshold, it is determined that the consumption of the voltage at the output terminal has been completed, and the voltage at the input terminal is still greater than the first voltage threshold, and the high-voltage pulse output by the external power supply module has not been completely consumed. The feedback control module controls the driving module to turn on the high-voltage pulse suppression module, connecting the external power supply module and the external load, so as to continue to consume the high-voltage pulse output by the external power supply module through the high-voltage pulse suppression module.

[0057] In some embodiments, the method further includes: controlling the driving module to turn on the high-voltage pulse suppression module based on the voltage value at the input terminal being less than the first voltage threshold.

[0058] Specifically, since the high-voltage pulse of the external power supply module has not been completely consumed, after the feedback control module controls the driving module to turn on the high-voltage pulse suppression module to connect the external power supply module and the external load, the high-voltage pulse suppression module continues to consume the high-voltage pulse output by the external power supply module. At this time, the voltage value at the output terminal will rise again. If the voltage value at the output terminal is greater than the second voltage threshold after rising and the voltage value at the input terminal is still greater than the first voltage threshold, the high-voltage pulse has not been completely consumed. The feedback control module controls the driving module to disconnect the high-voltage pulse suppression module again, cutting off the connection between the external power supply module and the external load. The high-voltage pulse suppression module and the external load continue to consume the voltage at the output terminal. When the voltage at the output terminal is less than the third voltage threshold and the voltage at the input terminal is greater than the first voltage threshold, the feedback control module controls the driving module to turn on the high-voltage pulse suppression module again to connect the external power supply module and the external load, and repeatedly execute the above steps until the feedback control module determines that the voltage value at the input terminal is less than the first voltage threshold, determining that the high-voltage pulse has been completely consumed, and the control module controls the driving module to turn on the high-voltage pulse suppression module to connect the external power supply module and the external load. Thus, by repeatedly consuming the high-voltage pulse multiple times, the suppression of the high-voltage pulse is achieved, avoiding damage to the external load due to the high-voltage pulse, and at the same time maintaining the stability of the power network.

[0059] It should be noted that in this document, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising an..." does not exclude the existence of additional identical elements in the process, method, article or device comprising the element.

[0060] The above are only specific embodiments of the present disclosure, enabling those skilled in the art to understand or implement the present disclosure. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present disclosure. Therefore, the present disclosure will not be limited to these embodiments herein, but rather to the broadest scope consistent with the principles and novel features disclosed herein.

Claims

1. A high voltage pulse suppression circuit, characterized in that: include: A high-voltage pulse suppression module, through which the external power supply module is electrically connected to the external load, and the high-voltage pulse suppression module is used to consume the high-voltage pulse; A feedback control module is electrically connected to the input end of the high-voltage pulse suppression module and the output end of the high-voltage pulse suppression module, and the feedback control module is used to output a first control signal according to the voltage value of the input end being greater than a first voltage threshold and the voltage value of the output end being greater than a second voltage threshold; the feedback control module is also used to output a second control signal according to the voltage value of the input end being greater than the first voltage threshold and the voltage value of the output end being less than a third voltage threshold; a driving module, electrically connected to the control end of the high-voltage pulse suppression module, the driving module being used to control the high-voltage pulse suppression module to cut off the connection between the external power supply module and the external load according to the first control signal; and to control the high-voltage pulse suppression module to conduct the external power supply module and the external load according to the second control signal; Among them, the first voltage threshold is greater than the upper voltage limit value for normal operation of the external load; the second voltage threshold is greater than the lower voltage limit value for normal operation of the external load, and is less than the upper voltage limit value; the third voltage threshold is greater than the lower voltage limit value, and is less than the upper voltage limit value, and the second voltage threshold is greater than the third voltage threshold.

2. The suppression circuit according to claim 1, characterized in that The high-voltage pulse suppression module includes a switch unit and a voltage-stabilizing capacitor; The control end of the switch unit is electrically connected to the driving module, the external power supply module is electrically connected to the first end of the switch unit, and the second end of the switch unit is electrically connected to the external load; the second end of the switch unit is also grounded through the voltage stabilizing capacitor.

3. The suppression circuit according to claim 2, characterized in that The switch unit includes: a first NMOS tube and a second NMOS tube; The gate of the first NMOS tube and the gate of the second NMOS tube are both electrically connected to the driving module, the drain of the first NMOS tube is electrically connected to the external power supply module, the source of the first NMOS tube is electrically connected to the source of the second NMOS tube, and the drain of the second NMOS tube is electrically connected to the external load.

4. The suppression circuit according to claim 1, characterized in that Also includes an overheat protection unit; The overheat protection unit is electrically connected to the control end of the high-voltage pulse suppression module. The overheat protection unit is used to detect the operating temperature of the high-voltage pulse suppression module, and based on the operating temperature being greater than a temperature threshold, control the high-voltage pulse suppression module to cut off the connection between the external power supply module and the external load.

5. The suppression circuit according to claim 1, characterized in that Also includes an overvoltage protection unit; The overvoltage protection unit is electrically connected to the control end of the high-voltage pulse suppression module, and the overvoltage protection unit is used to detect the operating voltage of the high-voltage pulse suppression module, and control the high-voltage pulse suppression module to cut off the connection between the external power supply module and the external load based on the operating voltage being greater than a fourth voltage threshold; The fourth voltage threshold is greater than the voltage upper limit value and less than the withstand voltage value of the external load.

6. The suppression circuit according to claim 1, characterized in that It also includes an electrostatic protection unit; the input end of the high-voltage pulse suppression module is grounded through the electrostatic protection unit.

7. A high voltage pulse suppression device, characterized in that: A high voltage pulse suppression circuit comprising the high voltage pulse suppression circuit as claimed in any one of claims 1 to 6.

8. A method for suppressing high voltage pulses, characterized in that: Applied to the high voltage pulse suppression device of claim 7, the method comprises: Obtaining a voltage value of the input terminal and a voltage value of the output terminal; Based on the fact that the voltage value of the input terminal is greater than the first voltage threshold, and the voltage value of the output terminal is greater than the second voltage threshold, the driving module is controlled to disconnect the high-voltage pulse suppression module.

9. The suppression method according to claim 8, characterized in that: After controlling the driving module to disconnect the high-voltage pulse suppression module based on the voltage value of the input terminal being greater than the first voltage threshold and the voltage value of the output terminal being greater than the second voltage threshold, the method further includes: Based on the fact that the voltage value of the input terminal is greater than the first voltage threshold and the voltage value of the output terminal is less than the third voltage threshold, the driving module is controlled to turn on the high-voltage pulse suppression module.

10. The suppression method according to claim 9, characterized in that: The method further comprises: Based on the voltage value of the input terminal being less than the first voltage threshold, the driving module is controlled to turn on the high-voltage pulse suppression module.

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