High-voltage signal threshold detection circuit, detection method and electronic components

Abstract

This invention discloses a high-voltage signal threshold detection circuit, comprising a voltage divider module and a hysteresis comparator module. The voltage divider module is electrically connected to the input terminal of the high-voltage signal and is used to divide the high-voltage signal according to a voltage division coefficient to output a low-voltage signal. The hysteresis comparator module is electrically connected to the voltage divider module and is used to perform threshold detection on the low-voltage signal output by the voltage divider module and output a level signal. When the low-voltage signal is greater than the high-level threshold, the hysteresis comparator module outputs a high level; when the low-voltage signal is less than the low-level threshold, the hysteresis comparator module outputs a low level. Therefore, this invention can effectively detect high-voltage signals, uses low-voltage technology to achieve flexible and adjustable threshold windows, avoids output voltage jitter, and improves detection accuracy and efficiency. The structure is simple, effectively reducing the complexity of existing circuits, reducing power consumption and transistor footprint, and also improving the portability of this solution, thus meeting different design requirements.

Description

Technical Field

[0001] This invention relates to the field of signal detection technology, and in particular to a high-voltage signal threshold detection circuit, detection method, and electronic components. Background Technology

[0002] Power / signal detection circuits are widely used in integrated circuit systems, especially for pluggable interfaces such as HDMI and DP.

[0003] In practical applications, a reference voltage generation circuit and a voltage comparator are usually used to compare the input signal with the reference voltage to achieve threshold detection of the input and output signals. However, such signal detection circuits rely on a highly accurate reference voltage, have a complex structure, consume a lot of power, and are difficult to implement threshold detection of high voltage signals.

[0004] Therefore, it is particularly important to provide a high-voltage signal threshold detection circuit to realize the threshold detection of high-voltage signals. Summary of the Invention

[0005] This invention provides a high-voltage signal threshold detection circuit and electronic components, which can effectively detect high-voltage signals. It adopts low-voltage technology to achieve flexible adjustment of the threshold window, avoids output voltage jitter, and improves detection accuracy and efficiency. The structure is simple, which effectively reduces the complexity of existing circuits, reduces power consumption and tube area, and improves the portability of this solution, making it easier to meet different design requirements.

[0006] To address the aforementioned technical problems, the first aspect of this invention discloses a high-voltage signal threshold detection circuit, which includes a voltage divider module and a hysteresis comparison module, wherein:

[0007] The voltage divider module is electrically connected to the input terminal of the high-voltage signal and is used to divide the high-voltage signal according to the voltage division coefficient and output a low-voltage signal.

[0008] The hysteresis comparison module is electrically connected to the voltage divider module and is used to perform threshold detection on the low-voltage signal output by the voltage divider module and then output a level signal. When the low-voltage signal is greater than the high-level threshold, the hysteresis comparison module outputs a high level; when the low-voltage signal is less than the low-level threshold, the hysteresis comparison module outputs a low level.

[0009] As an optional implementation, in the first aspect of the present invention, a voltage clamping module is further provided between the voltage divider module and the hysteresis comparator module, wherein:

[0010] The voltage clamping module is electrically connected to the output terminal of the voltage divider module and to the input terminal of the hysteresis comparator module. It is used to limit the low-voltage signal output by the voltage divider module so that the voltage output to the hysteresis comparator module is lower than or equal to the clamping threshold voltage.

[0011] When the low-voltage signal is less than or equal to the clamping threshold voltage, the output voltage of the voltage clamping module is the voltage of the low-voltage signal;

[0012] When the low-voltage signal is greater than the clamping threshold voltage, the output voltage of the voltage clamping module is the clamping threshold voltage.

[0013] As an optional implementation, in the first aspect of the invention, the circuit further includes a hysteresis adjustment module, wherein:

[0014] The hysteresis adjustment module is used to control the voltage division coefficient of the voltage divider module to adjust the high-level threshold and the low-level threshold of the high-voltage signal threshold detection circuit.

[0015] As an optional implementation, in the first aspect of the present invention, the voltage clamping module includes:

[0016] A first NMOS transistor, a second NMOS transistor, and a clamping power supply, wherein the clamping power supply is used to generate the clamping threshold voltage;

[0017] The drain of the first NMOS transistor is electrically connected to the output terminal of the voltage divider module and to the gate of the second NMOS transistor; the gate of the first NMOS transistor is electrically connected to the clamping power supply and to the drain of the second NMOS transistor; the source of the first NMOS transistor is electrically connected to the source of the second NMOS transistor and to the input terminal of the hysteresis comparator module.

[0018] As an optional implementation, in the first aspect of the present invention, the voltage divider module includes a plurality of voltage divider resistors connected in series, wherein at least a target voltage divider resistor for adjusting the voltage division coefficient is included.

[0019] The hysteresis adjustment module includes at least a switching device, wherein the two conductive ends of the switching device are connected in parallel with the target voltage divider resistor, and the control terminal of the switching device is electrically connected to a control signal; the two conductive ends of the switching device perform a closing or opening operation through the control signal to control the short-circuit state of the target voltage divider resistor to change the voltage division coefficient of the voltage divider module.

[0020] As an optional implementation, in the first aspect of the invention, any of the voltage divider resistors includes a Poly voltage divider resistor or a Mos voltage divider resistor.

[0021] A second aspect of the present invention discloses a high-voltage signal threshold detection method, the method being applied to the high-voltage signal threshold detection circuit as described in the first aspect of the present invention, the method comprising:

[0022] The voltage divider module divides the high-voltage signal according to the voltage division coefficient to obtain the low-voltage signal;

[0023] The hysteresis comparison module performs threshold detection on the low-voltage signal. When the hysteresis comparison module determines that the low-voltage signal is greater than the high-level threshold, it outputs a high level; when the hysteresis comparison module determines that the low-voltage signal is less than the low-level threshold, it outputs a low level.

[0024] As an optional implementation, in a second aspect of the invention, after the voltage divider module divides the high-voltage signal according to the voltage division coefficient to obtain the low-voltage signal, and before the hysteresis comparison module performs threshold detection on the low-voltage signal, the method further includes:

[0025] The voltage clamping module limits the low-voltage signal to obtain the output voltage of the voltage clamping module, which triggers the hysteresis comparison module to perform threshold detection on the output voltage of the voltage clamping module.

[0026] When the hysteresis comparison module determines that the output voltage of the voltage clamping module is greater than the high-level threshold, it outputs a high level; when the hysteresis comparison module determines that the output voltage of the voltage clamping module is less than the low-level threshold, it outputs a low level.

[0027] The voltage clamping module limits the low-voltage signal to obtain the output voltage of the voltage clamping module, including:

[0028] When the voltage clamping module determines that the low voltage signal is less than or equal to the clamping threshold voltage, it outputs the low voltage signal.

[0029] When the voltage clamping module determines that the low voltage signal is greater than the clamping threshold voltage, it outputs the clamping threshold voltage.

[0030] As an optional implementation, in a second aspect of the invention, after the hysteresis comparison module performs threshold detection on the output voltage of the voltage clamping module, the method further includes:

[0031] The hysteresis adjustment module controls the voltage division coefficient of the voltage divider module to adjust the high-level threshold to the target high-level threshold and the low-level threshold to the target low-level threshold.

[0032] A third aspect of the present invention discloses an electronic component, the electronic component including the high-voltage signal threshold detection circuit described in any one of the embodiments of the present invention.

[0033] Compared with the prior art, the present invention has the following beneficial effects:

[0034] This invention discloses a high-voltage signal threshold detection circuit, comprising a voltage divider module and a hysteresis comparator module. The voltage divider module is electrically connected to the input terminal of the high-voltage signal and is used to divide the high-voltage signal according to a voltage division coefficient to output a low-voltage signal. The hysteresis comparator module is electrically connected to the voltage divider module and is used to perform threshold detection on the low-voltage signal output by the voltage divider module and output a level signal. When the low-voltage signal is greater than the high-level threshold, the hysteresis comparator module outputs a high level; when the low-voltage signal is less than the low-level threshold, the hysteresis comparator module outputs a low level. Therefore, this invention can effectively detect high-voltage signals, uses low-voltage technology to achieve flexible and adjustable threshold windows, avoids output voltage jitter, and improves detection accuracy and efficiency. The structure is simple, effectively reducing the complexity of existing circuits, reducing power consumption and transistor footprint, and also improving the portability of this solution, thus meeting different design requirements. Attached Figure Description

[0035] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0036] Figure 1 This is a schematic diagram of the structure of a high-voltage signal threshold detection circuit disclosed in an embodiment of the present invention;

[0037] Figure 2 This is a schematic flowchart of another high-voltage signal threshold detection circuit disclosed in an embodiment of the present invention;

[0038] Figure 3 This is a schematic flowchart of another high-voltage signal threshold detection circuit disclosed in an embodiment of the present invention;

[0039] Figure 4 This is a schematic flowchart of another high-voltage signal threshold detection circuit disclosed in an embodiment of the present invention;

[0040] Figure 5This is a waveform diagram of the operation of a high-voltage signal threshold detection circuit disclosed in an embodiment of the present invention;

[0041] Figure 6 This is a schematic flowchart of a high-voltage signal threshold detection method disclosed in an embodiment of the present invention;

[0042] Figure 7 This is a flowchart illustrating another high-voltage signal threshold detection method disclosed in an embodiment of the present invention;

[0043] Figure 8 This is a schematic diagram of the structure of an electronic component disclosed in an embodiment of the present invention.

[0044] Explanation of icon numbers:

[0045] Voltage divider module 101; hysteresis comparator module 102; voltage clamping module 103; hysteresis adjustment module 104; high voltage signal input terminal HPD_in; output level signal terminal dout; first voltage divider resistor R1; second voltage divider resistor R2; third voltage divider resistor R3; low voltage signal node A; clamping power supply hv1p8; output node B of voltage clamping module; first NMOS transistor M1; second NMOS transistor M2; switching device M3. Detailed Implementation

[0046] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0047] The terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this invention are used to distinguish different objects, not to describe a specific order. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, apparatus, product, or end that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products, or ends.

[0048] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of the invention. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0049] This invention discloses a high-voltage signal threshold detection circuit and method. This circuit and method can effectively detect high-voltage signals. Employing low-voltage technology, the threshold window is flexibly adjustable, avoiding output voltage fluctuations and improving detection accuracy and efficiency. The simple structure effectively reduces the complexity of existing circuits, lowers power consumption and transistor footprint, and enhances the portability of the solution, making it suitable for various design requirements. Detailed descriptions follow.

[0050] Example 1

[0051] Please see Figure 1 , Figure 1 This is a schematic diagram of a high-voltage signal threshold detection circuit disclosed in an embodiment of the present invention. Figure 1 The described circuit can be applied to threshold detection circuits that require signal detection, and it can also be applied to power supply voltage detection (POR) circuits; however, this embodiment of the invention does not limit its application. Figure 1 As shown, the high-voltage signal threshold detection circuit may include a voltage divider module 101 and a hysteresis comparison module 102, wherein:

[0052] The voltage divider module 101 is electrically connected to the input terminal HPD_in of the high voltage signal and is used to divide the high voltage signal according to the voltage division coefficient and output a low voltage signal.

[0053] Hysteresis comparator 102 is electrically connected to voltage divider module 101. It is used to perform threshold detection on the low-voltage signal output by voltage divider module and output a level signal dou. When the low-voltage signal is greater than the high-level threshold, the output level signal terminal dou of hysteresis comparator 102 outputs a high level; when the low-voltage signal is less than the low-level threshold, the output level signal terminal dou of hysteresis comparator 102 outputs a low level.

[0054] In this embodiment of the invention, the voltage divider module 101 changes the voltage division coefficient by setting different voltage divider resistors, converting the input high voltage signal into a low voltage signal according to the voltage division coefficient. This allows the detection threshold of the entire high voltage signal detection circuit to be adjusted through voltage division. At the same time, the low voltage signal is transmitted to the low voltage signal node A, ensuring that the voltage at the low voltage signal node A is within the detectable range, thus avoiding device damage caused by overvoltage in the internal circuit.

[0055] As can be seen, the high-voltage signal threshold detection circuit described in this embodiment of the invention can convert a high-voltage signal into a low-voltage signal by using a voltage divider module 101 to avoid overvoltage in the internal circuit when the input signal is a high-voltage signal. By setting a reasonable voltage divider coefficient, the voltage of the input signal can be guaranteed to be within the detectable range, thus improving the detection accuracy. At the same time, the hysteresis comparison module 102 implements the hysteresis window specified by the system. By adjusting the size of the tubes inside the hysteresis comparison module 102, the desired hysteresis window (i.e., the high-level threshold and low-level threshold mentioned above) is achieved, and the low-voltage signal is flipped at the corresponding level threshold, thereby effectively realizing the threshold detection of the high-voltage signal. The structure is simple, effectively reducing the complexity of existing circuits, reducing power consumption and tube area, and improving the portability of this solution, which is conducive to meeting different design requirements.

[0056] In this optional embodiment, such as Figure 2 As shown, the high-voltage signal threshold detection circuit may specifically include:

[0057] The voltage divider module 101 and the hysteresis comparator module 102 are connected by the low-voltage signal node A0.

[0058] The voltage divider module consists of several voltage divider resistors connected in series; for example, the first voltage divider resistor R1, the second voltage divider resistor R2, and the third voltage divider resistor R3 are all equivalent resistances. Preferably, to improve the accuracy and precision of the voltage division, the voltage divider resistors can be in the form of poly resistors or MOSFET resistors, but this embodiment of the invention is not limited to these types.

[0059] Hysteresis comparator module 102 is implemented using a Schmitt buffer, an operational amplifier hysteresis circuit, a hysteresis comparator, or an N555 timer circuit.

[0060] In an optional embodiment, such as Figure 3 As shown, the high-voltage signal threshold detection circuit may further include a voltage clamping module 103 disposed between the voltage divider module 101 and the hysteresis comparison module 102, wherein:

[0061] The voltage clamping module 103 is electrically connected to the output terminal of the voltage divider module 101 (connection node is low voltage signal node A) and electrically connected to the input terminal of the hysteresis comparator module 102 (connection node is output node B of the voltage clamping module). It is used to limit the low voltage signal output by the voltage divider module 101 so that the voltage output to the hysteresis comparator module 102 is lower than or equal to the clamping threshold voltage (that is, the voltage of the clamping power supply hv1p8).

[0062] When the low-voltage signal is less than or equal to the clamping threshold voltage, the output voltage of the voltage clamping module 103 is the voltage of the low-voltage signal;

[0063] When the low voltage signal is greater than the clamping threshold voltage, the output voltage of the voltage clamping module 103 is the clamping threshold voltage.

[0064] In this embodiment of the invention, the voltage clamping module 103 is located after the voltage divider module 101. It is used to further limit the voltage of the low-voltage signal transmitted to the low-voltage signal node A after being divided by the voltage divider module 101, so as to ensure that the voltage value output to the output node B of the voltage clamping module does not exceed the clamping threshold voltage, and to ensure that the input voltage of the hysteresis comparator system 102 is less than the device withstand voltage, thereby further avoiding device damage caused by overvoltage during the high-voltage signal detection process.

[0065] As can be seen, the high-voltage signal threshold detection circuit described in this embodiment of the invention can further use the voltage clamping module 103 to clamp the low-voltage signal, ensuring that the input voltage to the hysteresis comparison module 102 is less than the device withstand voltage, and at the same time ensuring that the input voltage is within the input window range of the hysteresis comparison module 102, which is beneficial to improving the applicability and safety of this solution; at the same time, the circuit structure is simple, effectively reducing the complexity of existing circuits, reducing power consumption and tube area, and improving the portability of this solution, which is beneficial to meeting different design requirements.

[0066] In this optional embodiment, such as Figure 4 As shown, the voltage clamping module 103 may specifically include:

[0067] The first NMOS transistor M1, the second NMOS transistor M2, and the clamping power supply hv1p8 are used to generate the clamping threshold voltage.

[0068] Specifically, the drain of the first NMOS transistor M1 is electrically connected to the output terminal of the voltage divider module 101 (connection node is low-voltage signal node A) and is electrically connected to the gate of the second NMOS transistor M2; the gate of the first NMOS transistor M1 is electrically connected to the clamping power supply hv1p8 and is electrically connected to the drain of the second NMOS transistor M2; the source of the first NMOS transistor M1 is electrically connected to the source of the second NMOS transistor M2 and is electrically connected to the input terminal of the hysteresis comparator module 102 (connection node is output node B of the voltage clamping module).

[0069] In this embodiment of the invention, when the input voltage of the voltage clamping module 103 is a low-voltage signal, the clamping threshold voltage generated by the clamping power supply hv1p8 acts on the gate (G) of the first NMOS transistor M1. The Vgs voltage difference of the first NMOS transistor M1 causes the first NMOS transistor M1 to conduct. At this time, the output voltage of the voltage clamping module 103 is the voltage of the low-voltage signal. However, because the Vgs voltage difference of the second NMOS transistor M2 is smaller, the second NMOS transistor M2 is turned off. When the input voltage of the voltage clamping module 103 exceeds the clamping threshold voltage, the circuit operation principle is similar to the above process. At this time, the first NMOS transistor M1 is in the off state, and the second NMOS transistor M2 is in the conducting state. At this time, the output voltage of the voltage clamping module 103 is the clamping threshold voltage.

[0070] As can be seen, the high-voltage signal threshold detection circuit described in the embodiments of the present invention can effectively achieve voltage clamping operation using a dual NMOS mirror circuit. The circuit structure is simple, reducing the complexity and cost of existing circuits, as well as reducing power consumption and tube footprint.

[0071] In another alternative embodiment, such as Figure 3 As shown, the high-voltage signal threshold detection circuit may further include a hysteresis adjustment module 104, wherein:

[0072] The hysteresis adjustment module 104 is used to control the voltage division coefficient of the voltage divider module in order to adjust the high-level threshold and low-level threshold of the high-voltage signal threshold detection circuit.

[0073] In this embodiment of the invention, for example, when the voltage division coefficient of the voltage divider module 101 is 0.5 due to the voltage dividing resistor, it is equivalent to the circuit realizing voltage reversal at 0.5 * high voltage signal voltage for the externally input high voltage signal. At this time, if the hysteresis adjustment module 104 short-circuits the voltage dividing resistor of the voltage divider module, changing the voltage division coefficient of the voltage divider module 101 to 0.6, it is equivalent to the circuit realizing voltage reversal at 0.6 * high voltage signal voltage.

[0074] As can be seen, the high-voltage signal threshold detection circuit described in this embodiment of the invention can achieve flexible adjustment of the threshold window using low-voltage technology. The hysteresis window can be adjusted according to different indicators, which improves the portability of the solution and helps to meet different design requirements.

[0075] In this optional embodiment, such as Figure 4 As shown, the voltage divider module 101 includes a plurality of voltage divider resistors connected in series, including at least a target voltage divider resistor R2 for adjusting the voltage division coefficient.

[0076] The hysteresis adjustment module 104 includes at least a switching device M3, wherein the two conducting ends of the switching device M3 are connected in parallel with the target voltage divider resistor R2, and the control end of the switching device M3 is electrically connected to a control signal; the two conducting ends of the switching device M3 are closed or opened by the control signal to control the short-circuit state of the target voltage divider resistor R2 to change the voltage division coefficient of the voltage divider module 101.

[0077] In this embodiment of the invention, the voltage divider module 101 includes an equivalent first voltage divider resistor R1, a target voltage divider resistor R2 (i.e., the aforementioned second voltage divider resistor), and a third voltage divider resistor R3. For example, the hysteresis adjustment module 104 can be implemented using a positive feedback MOS switch M3. The control terminal (gate) of the MOS switch M3 is electrically connected to the output terminal of the hysteresis comparator module 102. The two conductive terminals (i.e., drain and source) of the MOS switch M3 are connected in parallel with the target voltage divider resistor R2. The voltage division coefficient of the voltage divider module 101 can be controlled through the output of the hysteresis comparator module 104, thereby expanding the different threshold windows of the high-voltage signal threshold detection circuit. Furthermore, the hysteresis adjustment module 104 can also be controlled by digital signals to flexibly control the voltage at the resistor divider node.

[0078] As can be seen, the high-voltage signal threshold detection circuit described in this embodiment of the invention can flexibly control the voltage of the resistor divider node through switching devices, thereby expanding the different threshold windows of the high-voltage signal threshold detection circuit, further improving the portability of this solution, and helping to meet different design requirements.

[0079] In embodiments of the present invention, such as Figure 5 As shown in the figure, the high-voltage signal threshold detection circuit disclosed in this embodiment of the invention has the following waveforms: the upper waveform is the voltage change curve between the low-voltage signal node A and the output node B of the voltage clamping module 103; the lower waveform is the voltage change curve between the high-voltage signal input terminal HPD_in and the output level signal terminal dout of the high-voltage signal threshold detection circuit. It can be seen that the hysteresis window detection function is normal. When the input voltage A0 exceeds the bit power supply hv1p8 voltage, the input is clamped to the clamping threshold voltage to prevent overvoltage in the internal detection circuit.

[0080] Example 2

[0081] Please see Figure 6 , Figure 6 This is a schematic flowchart of a high-voltage signal threshold detection method disclosed in an embodiment of the present invention. Figure 6 The described method can be applied to any circuit that requires high-voltage signal threshold detection. For example... Figure 6 As shown, the high-voltage signal threshold detection method may include the following operations:

[0082] 201. The voltage divider module divides the high-voltage signal according to the voltage division coefficient to obtain the low-voltage signal.

[0083] 202. The hysteresis comparison module performs threshold detection on the low-voltage signal and outputs a level signal.

[0084] In this embodiment of the invention, when the hysteresis comparison module 102 determines that the low-voltage signal is greater than the high-level threshold, it outputs a high level; when the hysteresis comparison module 102 determines that the low-voltage signal is less than the low-level threshold, it outputs a low level.

[0085] As can be seen, the method described in this embodiment of the invention can convert a high-voltage signal into a low-voltage signal by using a voltage divider module to avoid overvoltage in the internal circuit when the input signal is a high-voltage signal. By setting a reasonable voltage division coefficient, the voltage of the input signal can be guaranteed to be within the detectable range, thus improving the detection accuracy. At the same time, the hysteresis comparison module 102 implements the hysteresis window specified by the system. By adjusting the size of the tubes inside the hysteresis comparison module 102, the desired hysteresis window (i.e., the high-level threshold and low-level threshold mentioned above) is achieved, and the low-voltage signal is flipped at the corresponding level threshold, thereby effectively realizing the threshold detection of the high-voltage signal. The structure is simple, effectively reducing the complexity of existing circuits, reducing power consumption and tube area, and improving the portability of this solution, which is conducive to meeting different design requirements.

[0086] Example 3

[0087] Please see Figure 7 , Figure 7 This is a flowchart illustrating another high-voltage signal threshold detection method disclosed in an embodiment of the present invention. Figure 7 The described method can be applied to any circuit that requires high-voltage signal threshold detection. For example... Figure 7 As shown, the high-voltage signal threshold detection method may include the following operations:

[0088] 301. The voltage divider module divides the high-voltage signal according to the voltage division coefficient to obtain the low-voltage signal.

[0089] 302. The voltage clamping module limits the low-voltage signal to obtain the output voltage of the voltage clamping module.

[0090] In this embodiment of the invention, the voltage clamping module 103 limits the low voltage signal to obtain the output voltage of the voltage clamping module 103, thereby triggering the hysteresis comparison module 102 to perform threshold detection on the output voltage of the voltage clamping module 103.

[0091] When the hysteresis comparator 102 determines that the output voltage of the voltage clamping module is greater than the high-level threshold, it outputs a high level; when the hysteresis comparator 102 determines that the output voltage of the voltage clamping module is less than the low-level threshold, it outputs a low level.

[0092] The voltage clamping module 103 limits the low-voltage signal to obtain the output voltage of the voltage clamping module 103, including:

[0093] When the voltage clamping module 103 determines that the low voltage signal is less than or equal to the clamping threshold voltage, it outputs a low voltage signal.

[0094] When the voltage clamping module 103 determines that the low voltage signal is greater than the clamping threshold voltage, it outputs the clamping threshold voltage.

[0095] 303. The hysteresis comparison module performs threshold detection on the output voltage of the voltage clamping module and outputs a level signal.

[0096] In this embodiment of the invention, for other descriptions of steps 301 and 303, please refer to the detailed descriptions of steps 201-202 in Embodiment 2, respectively. These descriptions will not be repeated in this embodiment.

[0097] As can be seen, the method described in this embodiment of the invention can further use the voltage clamping module 103 to clamp the low voltage signal, ensuring that the input voltage to the hysteresis comparator module 102 is less than the device withstand voltage, and at the same time ensuring that the input voltage is within the input window range of the hysteresis comparator module 102, which is beneficial to improving the applicability and safety of this solution; at the same time, the circuit structure is simple, effectively reducing the complexity of existing circuits, reducing power consumption and tube area, and improving the portability of this solution, which is beneficial to meeting different design requirements.

[0098] In an optional embodiment, such as Figure 7 As shown, after the hysteresis comparison module 102 performs threshold detection on the output voltage of the voltage clamping module 103, the method may further include the following operations:

[0099] 304. The hysteresis adjustment module controls the voltage divider coefficient of the voltage divider module to adjust the high-level threshold to the target high-level threshold and the low-level threshold to the target low-level threshold.

[0100] As can be seen, the method described in the embodiments of the present invention can achieve flexible and adjustable threshold window using low-pressure technology. The hysteresis window can be adjusted according to different indicators, which improves the portability of the solution and helps to meet different design requirements.

[0101] Example 3

[0102] Please see Figure 8 , Figure 8This is a schematic diagram of the structure of an electronic component disclosed in an embodiment of the present invention. The electronic component includes any of the circuits for high-voltage signal threshold detection as described in Embodiment 1. Furthermore, the electronic component includes, but is not limited to, any electronic component requiring constant current for signal threshold detection, such as signal threshold detection or power supply voltage detection (POR). It should be noted that for a detailed description of the high-voltage signal threshold detection circuit, please refer to the specific description in Embodiment 1; this embodiment will not repeat it.

[0103] As can be seen, the electronic components described in this embodiment of the invention can effectively detect high-voltage signals. The use of low-voltage technology enables flexible adjustment of the threshold window, avoiding output voltage fluctuations and improving detection accuracy and efficiency. The simple structure effectively reduces the complexity of existing circuits, lowers power consumption and transistor footprint, and enhances the portability of this solution, thus meeting diverse design requirements.

[0104] Example 4

[0105] This invention discloses an electronic device that requires signal threshold detection, and the electronic device includes a circuit for high-voltage signal threshold detection as described in any of the embodiments in Embodiment 1. It should be noted that for a detailed description of the high-voltage signal threshold detection circuit, please refer to the specific description in Embodiment 1; this embodiment will not repeat it.

[0106] The circuit embodiments described above are merely illustrative. The modules described as separate components may or may not be physically separate, and the components shown as modules may or may not be physical modules; that is, they may be located in one place or distributed across multiple modules. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without any creative effort.

[0107] Through the detailed description of the above embodiments, those skilled in the art can clearly understand that each implementation method can be implemented by means of software plus necessary general-purpose hardware platforms, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solutions, in essence or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, including read-only memory (ROM), random access memory (RAM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), one-time programmable read-only memory (OTPROM), electrically-Erasable Programmable Read-Only Memory (EEPROM), compact disc read-only memory (CD-ROM) or other optical disc storage, disk storage, magnetic tape storage, or any other computer-readable medium that can be used to carry or store data.

[0108] Finally, it should be noted that the high-voltage signal threshold detection circuit and method disclosed in the embodiments of the present invention are merely preferred embodiments of the present invention, and are only used to illustrate the technical solutions of the present invention, not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A high-voltage signal threshold detection circuit, characterized in that, The high-voltage signal threshold detection circuit includes a voltage divider module and a hysteresis comparison module, wherein: The voltage divider module is electrically connected to the input terminal of the high-voltage signal and is used to divide the high-voltage signal according to the voltage division coefficient and output a low-voltage signal. The voltage divider module includes a plurality of voltage divider resistors connected in series, wherein at least a target voltage divider resistor is included for adjusting the voltage division coefficient. The hysteresis comparison module is electrically connected to the voltage divider module and is used to perform threshold detection on the low-voltage signal output by the voltage divider module and then output a level signal. When the low-voltage signal is greater than the high-level threshold, the hysteresis comparison module outputs a high level; when the low-voltage signal is less than the low-level threshold, the hysteresis comparison module outputs a low level. The hysteresis comparison module adjusts the internal tube size to adjust the high-level threshold and the low-level threshold of the high-voltage signal threshold detection circuit; The circuit also includes a hysteresis adjustment module, wherein: The hysteresis adjustment module is used to control the short-circuit state of the voltage divider resistor of the voltage divider module to change the voltage divider coefficient of the voltage divider module.

2. The high-voltage signal threshold detection circuit according to claim 1, characterized in that, A voltage clamping module is also provided between the voltage divider module and the hysteresis comparator module, wherein: The voltage clamping module is electrically connected to the output terminal of the voltage divider module and to the input terminal of the hysteresis comparator module. It is used to limit the low-voltage signal output by the voltage divider module so that the voltage output to the hysteresis comparator module is lower than or equal to the clamping threshold voltage. When the low-voltage signal is less than or equal to the clamping threshold voltage, the output voltage of the voltage clamping module is the voltage of the low-voltage signal; When the low-voltage signal is greater than the clamping threshold voltage, the output voltage of the voltage clamping module is the clamping threshold voltage.

3. The high-voltage signal threshold detection circuit according to claim 1 or 2, characterized in that, Voltage clamping module, including: A first NMOS transistor, a second NMOS transistor, and a clamping power supply, wherein the clamping power supply is used to generate a clamping threshold voltage; The drain of the first NMOS transistor is electrically connected to the output terminal of the voltage divider module and to the gate of the second NMOS transistor; the gate of the first NMOS transistor is electrically connected to the clamping power supply and to the drain of the second NMOS transistor; the source of the first NMOS transistor is electrically connected to the source of the second NMOS transistor and to the input terminal of the hysteresis comparator module.

4. The high-voltage signal threshold detection circuit according to claim 3, characterized in that, The hysteresis adjustment module includes at least a switching device, wherein the two conductive ends of the switching device are connected in parallel with the target voltage divider resistor, and the control terminal of the switching device is electrically connected to a control signal; the two conductive ends of the switching device perform a closing or opening operation through the control signal to control the short-circuit state of the target voltage divider resistor to change the voltage division coefficient of the voltage divider module.

5. The high-voltage signal threshold detection circuit according to claim 4, characterized in that, Any of the voltage divider resistors mentioned above includes a Poly voltage divider resistor or a Mos voltage divider resistor.

6. A method for detecting a high-voltage signal threshold, characterized in that, The method is applied to the high-voltage signal threshold detection circuit as described in claim 1, and the method includes: The voltage divider module divides the high-voltage signal according to the voltage division coefficient to obtain the low-voltage signal; The voltage divider module includes a plurality of voltage divider resistors connected in series, wherein at least a target voltage divider resistor is included for adjusting the voltage division coefficient. The hysteresis comparison module performs threshold detection on the low-voltage signal. When the hysteresis comparison module determines that the low-voltage signal is greater than the high-level threshold, it outputs a high level; when the hysteresis comparison module determines that the low-voltage signal is less than the low-level threshold, it outputs a low level. The hysteresis comparison module adjusts the internal tube size to adjust the high-level threshold and the low-level threshold of the high-voltage signal threshold detection circuit; After the voltage divider module divides the high-voltage signal according to the voltage division coefficient to obtain the low-voltage signal, and before the hysteresis comparison module performs threshold detection on the low-voltage signal, the method further includes: The voltage clamping module limits the low-voltage signal to obtain the output voltage of the voltage clamping module, which triggers the hysteresis comparison module to perform threshold detection on the output voltage of the voltage clamping module. After the hysteresis comparison module performs threshold detection on the output voltage of the voltage clamping module, the method further includes: The hysteresis adjustment module changes the voltage division coefficient of the voltage divider module by controlling the short-circuit state of the voltage divider resistor.

7. The high-voltage signal threshold detection method according to claim 6, characterized in that, After the voltage divider module divides the high-voltage signal according to the voltage division coefficient to obtain the low-voltage signal, and before the hysteresis comparison module performs threshold detection on the low-voltage signal, the method further includes: When the hysteresis comparison module determines that the output voltage of the voltage clamping module is greater than the high-level threshold, it outputs a high level; when the hysteresis comparison module determines that the output voltage of the voltage clamping module is less than the low-level threshold, it outputs a low level. The voltage clamping module limits the low-voltage signal to obtain the output voltage of the voltage clamping module, including: When the voltage clamping module determines that the low voltage signal is less than or equal to the clamping threshold voltage, it outputs the low voltage signal. When the voltage clamping module determines that the low voltage signal is greater than the clamping threshold voltage, it outputs the clamping threshold voltage.

8. An electronic component, characterized in that, The electronic component includes the high-voltage signal threshold detection circuit as described in any one of claims 1-5.

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