A level conversion circuit, a high-voltage high-side drive circuit, and an electronic device

Abstract

The application provides a level conversion circuit, a high-side high-voltage drive circuit and an electronic device. A first level output unit of the level conversion circuit is configured to access a first level signal. A second level output unit is configured to access a second level signal. The first level signal has a weaker adjustment capability on the input end level than the second level signal. A threshold determination unit has an input end and an output end. The input end is connected with the first level output unit and the second level output unit and configured to access the first level signal or the second level signal. The output end is configured to output a first conversion signal based on the level of the input end. A positive feedback module is connected with the input end and the output end and configured to positively adjust the level of the input end based on the first conversion signal. The level of the input end is adjusted based on the first conversion signal through the positive feedback module, which is conducive to accelerating the change speed of the input end level and further conducive to quickly stabilizing the first conversion signal.

Description

Technical Field

[0001] This application belongs to the field of level conversion generation technology, and particularly relates to a level conversion circuit, a high voltage high-side drive circuit, and an electronic device. Background Technology

[0002] Level conversion circuits are the core units in electronic systems that enable signal interaction between different voltage domains. Their core function is to accurately convert a logic signal of one voltage level into a signal of another voltage level to adapt to the operating voltage requirements of different functional modules.

[0003] In related technologies, level conversion circuits generally suffer from slow conversion speeds, making it difficult to meet the timeliness requirements of high-voltage drive systems. For single-ended level converters, capacitors are typically connected in parallel across the resistor to improve anti-interference capabilities. However, the charging and discharging characteristics of the capacitor significantly hinder the signal rise and fall processes, leading to increased signal conversion delays and an inability to quickly respond to changes in the input signal. On the other hand, differential level converters require two or more times the number of high-voltage devices. The parasitic capacitance and resistance of these devices themselves increase the equivalent load on signal transmission. Furthermore, the complex latching structure and differential signal processing introduce additional signal delays, limiting the overall conversion rate. Summary of the Invention

[0004] The purpose of this application is to provide a level conversion circuit, a high voltage high-side drive circuit, and an electronic device, which aims to solve the problem of low conversion rate in conventional level conversion circuits.

[0005] A first aspect of this application provides a level conversion circuit, the level conversion circuit comprising:

[0006] The first level output unit is used to receive the first level signal; A second level output unit is used to receive a second level signal; the ability of the first level signal to adjust the input level is weaker than the ability of the second level signal to adjust the input level. The threshold determination unit has an input terminal and an output terminal. The input terminal is connected to the first level output unit and the second level output unit and is used to receive the first level signal or the second level signal. The output terminal is used to output a first conversion signal based on the level of the input terminal. A positive feedback module, connected to the input terminal and the output terminal, is used to positively adjust the level of the input terminal based on the first conversion signal. The positive feedback module includes a first positive feedback unit and a second positive feedback unit. The second positive feedback unit acquires the first conversion signal and outputs a second feedback signal to the input terminal based on the first conversion signal. The first positive feedback unit acquires the first conversion signal and outputs a first feedback signal to the input terminal based on the first conversion signal. The second feedback signal is a pulse signal, used to adjust the level of the input terminal to a first preset level before the first feedback signal. The first feedback signal is used to stabilize the level of the input terminal at a second preset level. The first feedback signal has a weaker ability to adjust the input level than the first level signal; the sum of the adjustment capabilities of the first feedback signal and the first level signal on the input level is weaker than the adjustment capability of the second level signal on the input level.

[0007] In some embodiments of this application, the first positive feedback unit includes: A pull-up sub-unit is used to receive a high-level signal and output a first sub-feedback signal to pull the level of the input terminal high; The pull-down sub-unit is used to receive a low-level signal and output a second sub-feedback signal to pull the level of the input terminal low.

[0008] In some embodiments of this application, the pull-up subunit includes a first pull-up bias and a first switch. One end of the first pull-up bias is used to receive a high-level signal, and the other end of the first pull-up bias is connected to the first switch. The other end of the first switch is connected to the input terminal. The control electrode of the first switch is connected to the output terminal. And / or, the pull-down subunit includes a first pull-down bias and a second switch, one end of the first pull-down bias is used to receive a low-level signal, the other end of the first pull-down bias is connected to the second switch, the other end of the second switch is connected to the input terminal; the control electrode of the second switch is connected to the output terminal.

[0009] In some embodiments of this application, the sum of the adjustment capabilities of the first sub-feedback signal and the first level signal on the input terminal is less than the adjustment capability of the second level signal on the input terminal; And / or, the adjustment capability of the first level signal on the input terminal is greater than the adjustment capability of the second sub-feedback signal on the input terminal.

[0010] In some embodiments of this application, the second positive feedback unit includes: A pulse generation subunit is connected to the output terminal and is used to detect the rising and falling edge changes of the first conversion signal, and generate a first pulse signal and a second pulse signal according to the rising and falling edge changes. A third switch and / or a fourth switch, wherein the third switch is configured to conduct based on the first pulse signal to connect a high-level signal to the input terminal and pull the level of the input terminal high; and the fourth switch is configured to conduct based on the second pulse signal to connect a low-level signal to the input terminal and pull the level of the input terminal low.

[0011] In some embodiments of this application, the pulse generation subunit includes a time delay device, a first NOT gate device, an AND gate device, and an OR gate device; The first NOT gate device has a first input terminal and a first output terminal, the first input terminal is connected to the delay device, and the delay device is also connected to the output terminal; The OR gate device has a second input, a third input, and a second output. The second input is connected to the output terminal, and the third input is connected to the first output terminal. The second output terminal is used to output the first pulse signal. The AND gate device has a fourth input, a fifth input, and a third output. The fourth input is connected to the output terminal, and the fifth input is connected to the first output terminal. The third output terminal is used to output the second pulse signal.

[0012] In some embodiments of this application, the threshold determination unit includes a second NOT gate and a first Schmitt trigger connected in series, with the other end of the first Schmitt trigger being the input terminal and the other end of the second NOT gate being the output terminal.

[0013] In some embodiments of this application, the level conversion circuit further includes a second Schmitt trigger, which is disposed on the output terminal, and the positive feedback module is connected between the threshold determination unit and the second Schmitt trigger.

[0014] In some embodiments of this application, the first level output unit includes a second pull-up bias, one end of which is used to receive a high-level signal, and the other end of which is connected to the input terminal; And / or, the second level output unit includes a second pull-down bias and a fifth switch connected in series, the other end of the second pull-down bias is used to receive a low-level signal, the other end of the fifth switch is connected to the input terminal, and the control terminal of the fifth switch is used to receive a second conversion signal.

[0015] A second aspect of this application also provides a high-voltage high-side driving circuit, including a high-side switch and a level conversion circuit as described above, wherein a first conversion signal is used to be input to the gate of the high-side switch to drive the high-side switch.

[0016] A third aspect of the embodiments of this application also provides an electronic device, the electronic device including the level conversion circuit as described above or including the high voltage high-side drive circuit as described above.

[0017] The beneficial effects of this application are as follows: In the level conversion circuit, high-side high-voltage drive circuit, and electronic device of this application, the level conversion circuit includes a first level output unit, a second level output unit, a threshold determination unit, and a positive feedback module; the first level output unit is used to receive a first level signal; the second level output unit is used to receive a second level signal; the threshold determination unit has an input terminal and an output terminal, the input terminal is connected to the first level output unit and the second level output unit, and is used to receive the first level signal or the second level signal, the output terminal is used to output a first conversion signal based on the level of the input terminal; the positive feedback module is connected to the input terminal and the output terminal, and is used to positively adjust the level of the input terminal based on the first conversion signal; in this application, the first conversion signal at the output terminal is detected by the positive feedback module, and the level of the input terminal is adjusted based on the first conversion signal, which is beneficial to accelerate the change speed of the input terminal level, and thus beneficial to make the first conversion signal quickly and stably stabilized. Attached Figure Description

[0018] Figure 1 A schematic diagram of the framework structure of a level conversion circuit provided in an embodiment of this application; Figure 2 A schematic diagram of the circuit structure of a level conversion circuit provided in an embodiment of this application; Figure 3 A schematic diagram of the circuit structure of a level conversion circuit provided in another embodiment of this application; Figure 4 A timing diagram of multiple signals in a level conversion circuit provided in an embodiment of this application; Figure 5 A schematic diagram of the circuit structure of a level conversion circuit provided in another embodiment of this application; Figure 6 A schematic diagram of the circuit structure of a level conversion circuit provided in another embodiment of this application; Figure 7 A timing diagram of multiple signals in a level conversion circuit provided in another embodiment of this application; Figure 8 A schematic diagram of the circuit structure of a level conversion circuit provided in another embodiment of this application; Figure 9A timing diagram of multiple signals in a level conversion circuit provided in another embodiment of this application; Figure 10 This is a schematic diagram of the framework structure of a high-side high-voltage circuit provided in an embodiment of this application.

[0019] Specific element symbol explanations: 100 - First level output unit, 200 - Second level output unit, 300 - Threshold determination unit, 310 - Input terminal, 320 - Output terminal, 400 - Positive feedback module, 410 - First positive feedback unit, 420 - Second positive feedback unit, VOUT - First conversion signal, VIN - Second conversion signal, VDDH - High level signal, VSSL - Low level signal, U1 - Second Schmitt trigger, U2 - First Schmitt trigger, I_PU1 - First pull-up bias, IBIAS_PU - Second pull-up bias, I_PD1 - First pull-down bias, IBIAS_PD - Second pull-down bias. Detailed Implementation

[0020] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0021] It should be noted that when a component is referred to as being "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0022] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0023] It's important to understand that level conversion circuits are core units in electronic systems that enable signal interaction across different voltage domains. Their core function is to accurately convert logic signals of one voltage level into signals of another to adapt to the operating voltage requirements of different functional modules. In high-voltage high-side drive applications, especially those above 70V, digital logic modules typically operate in a low-voltage domain of 5V or 3.3V. However, the control signals for high-side switches need to adapt to a high-voltage domain ranging from VS to VS-5V. Level conversion circuits, as a crucial bridge connecting low-voltage digital logic and high-voltage switch control, must convert low-voltage logic signals referenced to ground into high-voltage control signals referenced to the power supply. This directly determines the normal start-up, shutdown, and operation control of the high-side drive system. They are widely used in various high-voltage power electronic devices and are core components ensuring system reliability and application scope.

[0024] However, existing level conversion circuits generally suffer from slow conversion speeds, making it difficult to meet the timeliness requirements of high-voltage drive systems. For single-ended level converters, which rely on resistors for level biasing, capacitors are typically connected in parallel across the resistors to improve anti-interference capabilities and resist interference from power fluctuations. However, the charging and discharging characteristics of capacitors significantly hinder the signal rise and fall processes, leading to increased signal conversion delays and an inability to quickly respond to changes in the input signal. While differential level converters improve stability through symmetrical topology, they require two or more times the number of high-voltage components. The parasitic capacitance and resistance of these components increase the equivalent load on signal transmission. Furthermore, the complex latching structure and differential signal processing introduce additional signal delays, limiting the overall conversion rate and failing to meet the fast response requirements of high-voltage, high-side drive systems, thus affecting the system's dynamic performance.

[0025] Based on this, this application improves upon traditional level conversion circuits, high-side high-voltage drive circuits, and electronic devices.

[0026] Please see Figure 1 , Figure 1This is a schematic diagram of the framework structure of the level conversion circuit provided in this embodiment. The level conversion circuit of this embodiment includes a first level output unit 100, a second level output unit 200, a threshold determination unit 300, and a positive feedback module 400. The first level output unit 100 is used to receive a first level signal. The second level output unit 200 is used to receive a second level signal. The threshold determination unit 300 has an input terminal 310 and an output terminal 320. The input terminal 310 is connected to the first level output unit 100 and the second level output unit 200 and is used to receive either the first level signal or the second level signal. The output terminal 320 is used to output a first conversion signal VOUT based on the level of the input terminal 310. The positive feedback module 400 is connected to the input terminal 310 and the output terminal 320 and is used to positively adjust the level of the input terminal 310 based on the first conversion signal VOUT.

[0027] It should be explained that the first level output unit 100 is a functional unit used to output signals of a specific level type, capable of stably transmitting the input level signal. The second level output unit 200 is a functional unit that works in conjunction with the first level output unit 100, outputting a level signal of a different type than the former. The threshold determination unit 300 is an electronic unit with a level threshold comparison function, which outputs the corresponding logic signal by detecting the relationship between the input level and a preset threshold. The positive feedback module 400 is an electronic module that can receive the signal from the output terminal 320 and act in reverse on the input terminal 310, enhancing the signal change trend by positively adjusting the input level. The first level signal is an electrical signal with a specific voltage range, one of the original input signals for level conversion, forming a high-low level pair with another level signal. The second level signal is an electrical signal with a voltage range different from the first level signal; the two are high and low levels respectively, jointly providing the signal basis for level conversion. The first conversion signal VOUT is the converted signal output after processing by the threshold determination unit 300, carrying the logical information of the original level signal, and is the target output signal for level conversion.

[0028] It is understood that the positive feedback module 400 in this embodiment adjusts the input level 310 based on the first conversion signal VOUT, which enhances the trend of the input level 310 change, facilitates faster conversion of the input level 310, and shortens signal transmission delay. Furthermore, by integrating signal input, judgment, and feedback functions into a single circuit, there is no need to add additional signal stabilization or acceleration modules, which simplifies the overall circuit structure, reduces the number of components used, and lowers design and manufacturing costs.

[0029] For example, when the level conversion circuit starts working, the first level output unit 100 receives a low-level signal VSSL, and the second level output unit 200 receives a high-level signal VDDH. Both types of signals are input through the input terminal 310 of the threshold determination unit 300. The threshold determination unit 300 detects the level state of the input terminal 310 in real time and outputs the corresponding first conversion signal VOUT from the output terminal 320 through the internally preset threshold comparison logic.

[0030] The positive feedback module 400 synchronously receives the first conversion signal VOUT output by the threshold determination unit 300 and adjusts the level of the input terminal 310 in a positive direction according to the logic state of the signal. If the first conversion signal VOUT is high, the positive feedback module 400 strengthens the high-level trend of the input terminal 310; if the first conversion signal VOUT is low, it strengthens the low-level trend of the input terminal 310, accelerating the transition of the input terminal 310 level to the target state.

[0031] Under the continuous adjustment of the positive feedback module 400, the input level 310 quickly reaches a stable state, and the first conversion signal VOUT output by the threshold determination unit 300 also quickly stabilizes, avoiding the signal fluctuation or delay problems in traditional conversion circuits. The entire process requires no additional intervention, ensuring both the efficiency of level conversion and improving the reliability of the converted signal, fully meeting the core requirements of high-voltage drive systems for low-voltage to high-voltage signal conversion.

[0032] In some embodiments of this application, the ability of the first level signal to adjust the level of the input terminal 310 is weaker than that of the second level signal to adjust the level of the input terminal 310; the positive feedback module 400 is used to adjust the level of the input terminal 310 in the same direction as the first level signal; and / or, the positive feedback module 400 is used to adjust the level of the input terminal 310 in the same direction as the second level signal.

[0033] It should be explained that the level adjustment capability refers to the strength to which the level signal changes the voltage state of the input terminal 310. This is determined by the signal's inherent characteristics and circuit parameters, directly affecting the rate and stability of the level change at the input terminal 310. Same-direction adjustment means that the level adjustment direction of the positive feedback module 400 is consistent with the adjustment direction of the level signal, which enhances the changing trend of the original signal and accelerates the transition of the input terminal 310 level towards the target state.

[0034] Understandably, this embodiment uses a setting where the first level adjustment capability is weaker than the second level, clearly defining the functional division of the two types of signals. This helps avoid signal adjustment conflicts and ensures the orderly nature of the level conversion logic. Furthermore, the setting where the positive feedback module 400 adjusts in the same direction as the first level signal compensates for the insufficient adjustment capability of the first level, enhancing its driving effect on the input level 310, and ensuring stable triggering of conversion even with weak signals. Simultaneously, the setting where the positive feedback module 400 adjusts in the same direction as the second level signal further strengthens the moderating effect of the second level, accelerating the stabilization of the input level 310 and improving the overall conversion speed.

[0035] For example, when the circuit starts working, if a first-level signal is input, due to its weak adjustment capability, the level at input terminal 310 only changes slowly. After the threshold determination unit 300 detects this change, it outputs a corresponding first conversion signal VOUT. After receiving this signal, the positive feedback module 400 adjusts the level at input terminal 310 in the same direction as the first-level signal, enhancing the driving effect of the first level and pushing the level at input terminal 310 to quickly approach the threshold determination standard. If a second-level signal is input, its strong adjustment capability directly drives a significant change in the level at input terminal 310. The threshold determination unit 300 synchronously outputs the first conversion signal VOUT, and the positive feedback module 400 adjusts in the same direction as the second-level signal, further accelerating the change process of the level at input terminal 310 and shortening the time to reach a stable state.

[0036] In some embodiments of this application, please refer to Figure 2 , Figure 2 A schematic diagram of the level conversion circuit provided in this embodiment is shown; as follows: Figure 2 The threshold determination shown is exemplified by the threshold determination module, the positive feedback module 2 by the second positive feedback unit 420, the positive feedback module 1 by the first positive feedback unit 410, VIH by the input terminal 310, and V2H by the output terminal 320. The positive feedback module 400 in this embodiment includes a first positive feedback unit 410 and a second positive feedback unit 420. The second positive feedback unit 420 is used to acquire a first conversion signal VOUT and output a second feedback signal to the input terminal 310 based on the first conversion signal VOUT. The first positive feedback unit 410 is used to acquire the first conversion signal VOUT and output a first feedback signal to the input terminal 310 based on the first conversion signal VOUT. The second feedback signal has a stronger ability to adjust the level of the input terminal 310 than the first feedback signal.

[0037] It should be explained that the first positive feedback unit 410 is a functional component in the positive feedback module 400 responsible for outputting a weakly modulating feedback signal. It maintains the stability of the signal conversion process by smoothly adjusting the input level 310. The second positive feedback unit 420 is a functional component that works in conjunction with the first positive feedback unit 410, outputting a feedback signal with stronger modulating capability, which can quickly amplify the changing trend of the input level 310. The first feedback signal is an electrical signal output by the first positive feedback unit 410, with weak modulating capability, mainly used to stabilize the input level 310 and reduce the impact of signal fluctuations. The second feedback signal is an electrical signal output by the second positive feedback unit 420, with significantly stronger modulating capability than the first feedback signal, which can quickly drive the input level 310 to the target state, shortening the conversion time.

[0038] It is understandable that this embodiment employs a second positive feedback unit 420 to output a second feedback signal with strong adjustment capability, which can quickly enhance the trend of level change at the input terminal 310, thus significantly shortening the response time of level conversion and improving the conversion rate. Furthermore, the first positive feedback unit 410 outputs a first feedback signal with weak adjustment capability, allowing for continuous fine-tuning of the input terminal 310 level during the stable level conversion phase. This helps reduce misjudgments caused by power fluctuations or interference, improving the stability of the converted signal. The combined use of strong and weak adjustment feedback signals accelerates the conversion process through strong feedback while ensuring stable output through weak feedback, balancing conversion efficiency and reliability to meet the precise conversion requirements of high-voltage and low-voltage signals.

[0039] After receiving the first conversion signal VOUT, the first positive feedback unit 410 outputs a first feedback signal to the input terminal 310. This signal, with its relatively weak adjustment capability, gently corrects the input terminal 310 level, reducing signal fluctuations and providing a stable foundation for the conversion process. Simultaneously, after receiving the first conversion signal VOUT, the second positive feedback unit 420 outputs a second feedback signal with stronger adjustment capability, rapidly driving the input terminal 310 level towards the target state and shortening the time it takes for the level to reach the stable threshold. In the initial stage of conversion, the strong adjustment effect of the second feedback signal dominates, accelerating the change in the input terminal 310 level. When the level approaches the stable threshold, the weak adjustment effect of the first feedback signal becomes prominent, maintaining level stability and avoiding overshoot or fluctuations. The two work together to ensure that the first conversion signal VOUT output by the threshold determination unit 300 quickly reaches a stable state, guaranteeing both conversion speed and signal reliability.

[0040] In some embodiments of this application, the positive feedback module 400 is used to adjust the level of the input terminal 310 in the same direction as the first level signal; the second feedback signal has a stronger ability to adjust the level of the input terminal 310 than the first level signal; and / or, the first feedback signal has a weaker ability to adjust the level of the input terminal 310 than the first level signal.

[0041] Understandably, this embodiment uses a second feedback signal with a stronger adjustment capability than the first level signal. This compensates for the insufficient adjustment capability of the first level signal, rapidly amplifies its adjustment trend, and helps shorten the conversion time of weak signals, thereby improving the overall conversion rate. Furthermore, using a first feedback signal with a weaker adjustment capability than the first level signal allows for a smoother and more stable input level 310 after conversion, avoiding signal overshoot or fluctuations caused by saturation, and improving the stability of the first conversion signal VOUT.

[0042] In some embodiments of this application, the positive feedback module 400 is used to adjust the level of the input terminal 310 in the same direction as the second level signal; the second feedback signal has a stronger ability to adjust the level of the input terminal 310 than the second level signal; and / or, the first feedback signal has a weaker ability to adjust the level of the input terminal 310 than the second level signal.

[0043] It is understandable that this embodiment uses a setting where the second feedback signal has a stronger adjustment capability than the second level signal. This further amplifies the driving effect of the second level signal, accelerates the change process of the input terminal 310 level, and is beneficial to significantly improve the level conversion speed and shorten the signal transmission delay. Furthermore, using a setting where the first feedback signal has a weaker adjustment capability than the second level signal allows for a smooth correction of the input terminal 310 level after conversion, avoiding signal oscillations caused by stress points, and improving the stability and anti-interference capability of the first conversion signal VOUT.

[0044] In some embodiments of this application, the second feedback signal is a pulse signal, used to adjust the level of the input terminal 310 to a first preset level before the first feedback signal; the first feedback signal is used to stabilize the level of the input terminal 310 at a second preset level.

[0045] It should be explained that a pulse signal is an electrical signal that changes rapidly within a short period of time and is maintained for a specific duration, possessing instantaneous strong driving characteristics. The first preset level is the transitional level state reached at the input terminal 310 after initial adjustment by the second feedback signal.

[0046] It is understandable that this embodiment uses a pulsed second feedback signal to first adjust the input terminal 310 level to the first preset level. This utilizes the instantaneous strong driving characteristics of the pulse signal to quickly start the level conversion process, which helps to significantly shorten the response time of the level conversion. Furthermore, using the first feedback signal to stabilize the input terminal 310 level at the second preset level can smoothly correct level fluctuations and avoid overshoot or oscillation after pulse adjustment, which helps to improve the stability and anti-interference capability of the first conversion signal VOUT.

[0047] For example, after receiving the first conversion signal VOUT, the second positive feedback unit 420 immediately outputs a pulse-shaped second feedback signal, which acts on the input terminal 310. This pulse signal, with its strong driving characteristics, quickly adjusts the level of the input terminal 310 to the first preset level, completing the conversion start-up phase and significantly shortening the initial level change time. After the pulse of the second feedback signal ends, the first positive feedback unit 410 continuously outputs the first feedback signal, smoothly adjusting the level of the input terminal 310. The first feedback signal drives the level of the input terminal 310 to gradually increase from the first preset level and stabilize at the second preset level, preventing level drop or fluctuation.

[0048] The threshold determination unit 300 outputs a continuously stable first conversion signal VOUT based on the stabilized second preset level, completing the entire level conversion process. The entire process, through the coordinated action of rapid pulse signal start-up and stable continuous signal termination, not only solves the problem of slow conversion speed in traditional single-ended structures but also ensures the stability of signal output. At the same time, the use of a single-ended structure reduces the use of high-voltage devices.

[0049] In some embodiments of this application, please refer to Figure 3 and Figure 4 , Figure 3 This diagram shows the circuit structure of the level conversion circuit provided in this embodiment. Figure 4 The timing diagram of multiple signals of the level conversion circuit provided in this embodiment is shown; as follows: Figure 3 Taking the pull-up module as an example of a pull-up sub-unit and the pull-down module as an example of a pull-down sub-unit, the first positive feedback unit 410 in this embodiment includes a pull-up sub-unit and a pull-down sub-unit; the pull-up sub-unit is used to receive a high-level signal VDDH and output a first sub-feedback signal to pull the level of the input terminal 310 high; the pull-down sub-unit is used to receive a low-level signal VSSL and output a second sub-feedback signal to pull the level of the input terminal 310 low.

[0050] It needs to be explained that the pull-up sub-unit is a functional component that receives the high-level signal VDDH and outputs a corresponding feedback signal. Its core function is to pull up the target node's voltage level, providing stable pull-up support for level transition. The pull-down sub-unit is a complementary component to the pull-up sub-unit. It outputs a feedback signal by connecting to the low-level signal VSSL and is specifically used to pull down the target node's voltage level, achieving bidirectional level adjustment in conjunction with the pull-up action. The first sub-feedback signal is an electrical signal output by the pull-up sub-unit, capable of pulling up the input terminal 310 voltage level. Its adjustment direction is consistent with the high-level signal VDDH, and it is a key signal for strengthening the high-level transition trend. The second sub-feedback signal is an electrical signal output by the pull-down sub-unit. Its core function is to pull down the input terminal 310 voltage level. Its adjustment direction is synchronized with the low-level signal VSSL, providing assistance for low-level transition.

[0051] It is understandable that this embodiment uses a pull-up sub-unit to connect to the high-level signal VDDH and output the first sub-feedback signal, which can accurately pull the input terminal 310 level high. Combined with the positive feedback module 400, this helps to strengthen the high-level conversion trend and improve the conversion stability of the high-level signal VDDH. Furthermore, the use of a pull-down sub-unit to connect to the low-level signal VSSL and output the second sub-feedback signal can specifically pull the input terminal 310 level low, forming a bidirectional adjustment mechanism with the pull-up sub-unit. This facilitates adaptation to bidirectional high-low level conversion requirements and broadens the circuit's applicable scenarios.

[0052] In some embodiments of this application, please refer to Figure 5 ,like Figure 5 Taking PM1 as an example of the first switching device, the pull-up sub-unit in this embodiment includes a first pull-up bias I_PU1 and a first switching device. One end of the first pull-up bias I_PU1 is used to connect to a high-level signal VDDH, and the other end of the first pull-up bias I_PU1 is connected to the first switching device. The other end of the first switching device is connected to the input terminal 310. The control electrode of the first switching device is connected to the output terminal 320.

[0053] It should be explained that the first pull-up bias I_PU1 is an electronic device used to provide a stable pull-up current, which can continuously output a specific current to support the high-level operation.

[0054] Understandably, using the first pull-up bias I_PU1 to stably provide the pull-up current can ensure the current stability when the input terminal 310 is pulled high, avoid level adjustment failure caused by current fluctuations, and help improve the reliability of the pull-up action.

[0055] In some embodiments, the first switching element is a P-channel MOSFET.

[0056] In some embodiments, please continue reading Figure 5 ,likeFigure 5 Taking the NM1 shown as an example of the second switching device, the pull-down sub-unit in this embodiment includes a first pull-down bias I_PD1 and a second switching device. One end of the first pull-down bias I_PD1 is used to connect to a low-level signal VSSL, and the other end of the first pull-down bias I_PD1 is connected to the second switching device. The other end of the second switching device is connected to the input terminal 310; the control electrode of the second switching device is connected to the output terminal 320.

[0057] In some embodiments, the second switching element is an N-channel MOSFET.

[0058] In some embodiments of this application, the first level signal is a high level signal VDDH, the second level signal is a low level signal VSSL, the sum of the signal value of the first sub-feedback signal and the signal value of the first level signal is less than the signal value of the second level signal; and / or, the signal value of the first level signal is greater than the signal value of the second sub-feedback signal.

[0059] Please continue reading. Figure 5 The positive feedback module 1 (level feedback) consists of a first pull-up bias I_PU1 and its first switch, and a first pull-down bias I_PD1 and its second switch. This module uses the output level of the threshold judgment module to pull up or down the V1H node. Specifically, IBIAS_PD > IBIAS_PU + I_PU1, and IBIAS_PU > I_PD1. When node V1H drops to the falling threshold of Schmitt trigger U2, the module activates the second switch to enhance the pull-down capability of V1H. When node V1H rises to the rising threshold of Schmitt trigger U2, the module activates the first switch to enhance the pull-up capability of V1H.

[0060] Please refer to the embodiments described in this application. Figure 5 ,like Figure 5 Taking PM2 as an example of the third switching device and NM2 as an example of the fourth switching device, the second positive feedback unit 420 in this embodiment includes a pulse generation subunit, a third switching device, and / or a fourth switching device. The pulse generation subunit is connected to the output terminal 320 and is used to detect the rising and falling edge changes of the first conversion signal VOUT, and generate a first pulse signal and a second pulse signal according to the rising and falling edge changes. The third switching device is used to turn on based on the first pulse signal to connect the high-level signal VDDH to the input terminal 310 to pull up the level of the input terminal 310. The fourth switching device is used to turn on based on the second pulse signal to connect the low-level signal VSSL to the input terminal 310 to pull down the level of the input terminal 310.

[0061] It should be explained that the pulse generation subunit is an electronic component with signal edge detection and pulse generation functions, which can capture signal level transitions and output short pulses.

[0062] Understandably, when the circuit starts working, the first conversion signal VOUT output by the threshold determination unit 300 is transmitted to the pulse generation subunit, which detects the rising and falling edges of this signal in real time. If a rising edge of the first conversion signal VOUT changing from 0 to 1 is detected, a first pulse signal is immediately generated and transmitted to the control electrode of the third switch; if a falling edge of 1 changing to 0 is detected, a second pulse signal is generated and transmitted to the control electrode of the fourth switch. After receiving the first pulse signal, the third switch is instantaneously turned on, quickly connecting the high-level signal VDDH to the input terminal 310, and pulling the level of the input terminal 310 high through strong driving action, accelerating its approach to the high-level preset threshold; after receiving the second pulse signal, the fourth switch is instantaneously turned on, connecting the low-level signal VSSL to the input terminal 310, quickly pulling the level of the input terminal 310 low, and pushing it to change to the low-level preset threshold. After the pulse signal ends, the third or fourth switch returns to the off state, and the first positive feedback unit 410 continues to play a stabilizing role, maintaining the level of the input terminal 310 at the target state.

[0063] In some embodiments, the third switching element is a P-channel MOSFET.

[0064] In some embodiments, the fourth switching element is an N-channel MOSFET.

[0065] Please refer to the embodiments described in this application. Figure 5 The pulse generation subunit includes a time delay device, a first NOT gate, an AND gate, and an OR gate. The first NOT gate has a first input and a first output. The first input is connected to the time delay device, and the time delay device is also connected to the output terminal 320. The OR gate has a second input, a third input, and a second output. The second input is connected to the output terminal 320, and the third input is connected to the first output. The second output is used to output a first pulse signal. The AND gate has a fourth input, a fifth input, and a third output. The fourth input is connected to the AND output terminal 320, and the fifth input is connected to the first output. The third output is used to output a second pulse signal.

[0066] Understandably, when the circuit starts working, the first conversion signal VOUT output by the threshold determination unit 300 is divided into two transmission paths: one path is directly sent to the second input of the OR gate and the fourth input of the AND gate; the other path is sent to the delay device, which processes the signal to generate a delay signal. This delay signal is input to the first input of the first NOT gate, and after being inverted by the NOT gate logic, it is output from the first output to the third input of the OR gate and the fifth input of the AND gate.

[0067] If the first conversion signal VOUT experiences a rising edge changing from 0 to 1, the second input of the OR gate immediately becomes high, while the third input remains high due to time delay and inversion. The OR gate satisfies the OR operation condition, outputting a first pulse signal from its second output, driving the third switch to conduct and achieving a strong pull-up at input level 310. At this time, the fourth input of the AND gate is high and the fifth input is low, failing the AND operation condition, and the third output does not output a second pulse signal.

[0068] If the first conversion signal VOUT experiences a falling edge changing from 1 to 0, the fourth input of the AND gate becomes low, and the fifth input becomes low after a time delay and inversion. The AND gate satisfies the AND operation condition, outputting a second pulse signal from the third output, driving the fourth switch to conduct, thus achieving a strong pull-down of the 310 level at the input terminal. At this time, the second input of the OR gate is low and the third input is high, not satisfying the OR operation condition, and the second output does not output a first pulse signal.

[0069] After the pulse signal lasts for 10 to 100 nanoseconds, as the timing difference between the delayed signal and the original signal disappears, the OR gate and AND gate devices return to their initial states, stopping the output of the pulse signal. The entire process, through the coordinated operation of the basic logic devices, accurately generates a bidirectional pulse signal, providing a reliable drive for the strong feedback action of the second positive feedback unit 420. This ensures both the accuracy and timeliness of the pulse signal while simplifying the circuit structure.

[0070] Please continue reading. Figure 5 In this embodiment, the positive feedback module 2 (pulse strong feedback) consists of a third pull-up switch, a fourth pull-down switch, and a pulse generation circuit. The pulse generation circuit detects the edge change of the threshold output module and generates a corresponding pulse. In this implementation, when the threshold determination module output changes from 0 to 1, the V2N node generates a high-level pulse, and remains at a low level for the rest of the time. The high-level pulse turns on the fourth switch, creating a strong pull-down pulse for the V1H node, causing the V1H node to stabilize at a low level more quickly. Conversely, when the threshold determination module output changes from 1 to 0, the V2P node generates a low-level pulse, and remains at a high level for the rest of the time. The low-level pulse turns on the third switch, creating a strong pull-up pulse for the V1H node, causing the V1H node to stabilize at a high level more quickly.

[0071] Please see Figure 6 and Figure 7, the level conversion circuit of this embodiment only performs pull-up positive feedback. In the level conversion circuit of this embodiment, the current limiting of the low-side transmitter is relatively large, and the low-side transmitter has a strong enough pulling-down ability on the V1H node. Therefore, the V1H node does not need to be pulled down in the positive feedback module. The specific principle is that when the low-side input VIN is 1, the second switching element is turned on. Since the current limiting ability of the low-side transmitter is much greater than the pull-up ability of the high side, the voltage of the V1H node drops rapidly and is maintained by the strong pulling-down of the transmitter current limiting module. After the threshold judgment module makes a judgment, it outputs a logic 0. When the low-side input VIN is 0, the second switching element is turned off, and the voltage of the V1H node starts to rise slowly by the weak pull-up of the high side until the output of the threshold judgment module is 1. The positive feedback module 1 is turned on for pull-up to enhance the pull-up ability on the V1H. Similarly, when the positive feedback module 2 detects the rising edge of the threshold judgment module, it generates a pulse signal to perform a pulse-type pull-up on the V1H node to accelerate the stabilization process of the rising. And since the pulling-down ability of the transmitter is strong enough and the falling rate of the V1H node itself is fast enough, no pulse strong pulling-down feedback action is performed.

[0072] Please refer to Figure 8 and Figure 9 , the threshold judgment module is implemented by a Schmitt trigger to judge the magnitude of the V1H level and output a logic signal. The positive feedback module 1 (level feedback) consists of a pull-up resistor R2 and its controlled first switching element. This module realizes the pull-up bias on the V1H node through the output of the threshold judgment module. Among them, R3 < R1 / / R2. In this circuit, the pulling-down ability of the resistor R3 is strong enough. Therefore, when the fifth switching element is turned on and the V1H node drops to the falling threshold of the Schmitt trigger, the positive feedback module 1 does not further pull down and enhance the V1H node. And when the V1H node rises to the rising threshold of the Schmitt trigger, this module turns on the first switching element, and the pull-up on the V1H node increases from only pulling up through the resistor R1 to pulling up through the resistor R1 / resistor R2.

[0073] The positive feedback module 2 (pulse strong feedback) consists of a pull-up controlled third switching element and a pulse generation circuit. The pulse generation circuit detects the falling edge of the threshold judgment module changing from 1 to 0 and generates a low-level pulse. This low-level pulse controls PM2 to turn on to perform a short-time strong pull-up on the V1H node to quickly pull up the V1H to a stable high level, and the third switching element is always in the off state at other times.

[0074] In this embodiment, the pulling-down ability on the V1H node realized by the resistor R3 is strong enough, and the response speed itself is fast enough when pulling down. The two-stage positive feedback structure only plays a positive feedback role when the voltage of the V1H node rises, improving the response speed and stability of the pull-up.

[0075] In some embodiments of this application, please continue to refer to Figure 5The threshold determination unit 300 in this embodiment includes a second NOT gate device and a first Schmitt trigger U2 connected in series. The other end of the first Schmitt trigger U2 is the input terminal 310, and the other end of the second NOT gate device is the output terminal 320.

[0076] Understandably, when the circuit starts working, the high-level signal VDDH of the first level output unit 100 or the low-level signal VSSL of the second level output unit 200 is transmitted to the input terminal 310 of the first Schmitt trigger U2. If the input signal has noise, slow changes, or amplitude fluctuations, the first Schmitt trigger U2, with its hysteresis characteristic, filters out invalid noise and shapes the input signal into a steep and stable digital signal, avoiding false triggering caused by small fluctuations. The signal shaped by the first Schmitt trigger U2 is transmitted to the second NOT gate device in series. The second NOT gate device performs a logical NOT operation on the signal, inverts it, and outputs it to form the first conversion signal VOUT. This signal is synchronously transmitted to the first positive feedback unit 410 and the second positive feedback unit 420 through the output terminal 320 of the threshold determination unit 300, providing a precise logical basis for feedback adjustment.

[0077] Please refer to the embodiments described in this application. Figure 1 , Figure 2 and Figure 5 The level conversion circuit also includes a second Schmitt trigger U1, which is located on the output terminal 320, and the positive feedback module 400 is connected between the threshold determination unit 300 and the second Schmitt trigger U1.

[0078] It is understandable that this embodiment uses the second Schmitt trigger U1 to shape the signal after feedback adjustment, which can filter out residual noise or waveform distortion that may be generated during the positive feedback process, thus improving the stability and purity of the final output signal. Furthermore, the hysteresis characteristic of the second Schmitt trigger U1 can prevent output mis-flipping caused by small signal fluctuations, further enhancing the circuit's anti-interference capability and adapting it to complex electromagnetic scenarios under high-voltage conditions.

[0079] Please refer to the embodiments described in this application. Figure 1 , Figure 2 and Figure 5The first level output unit 100 includes a second pull-up bias IBIAS_PU, one end of which is used to connect to a high-level signal VDDH, and the other end of which is connected to the input terminal 310; and / or, the second level output unit 200 includes a second pull-down bias IBIAS_PD and a fifth switch connected in series, the other end of which is used to connect to a low-level signal VSSL, and the other end of which is connected to the input terminal 310, and the control electrode of the fifth switch is used to connect to a second conversion signal VIN, the second conversion signal VIN being at the opposite level to the first conversion signal VOUT.

[0080] It is understandable that this embodiment uses a second pull-up biaser IBIAS_PU connected to the high-level signal VDDH and then to input terminal 310. This provides a stable high-level foundation for input terminal 310, which helps reduce fluctuations during high-level input and improves the stability of high-level conversion. Furthermore, the use of a fifth switch control electrode connected to a second conversion signal VIN, which is opposite to the first conversion signal VOUT, accurately matches the logic state of level conversion, facilitating precise on / off control of the pull-down path and avoiding invalid pull-down actions.

[0081] Furthermore, to better implement the level conversion circuit in any of the above embodiments, please refer to [reference needed] based on the level conversion circuit described above. Figure 10 This application embodiment also provides a high-voltage high-side driving circuit, including a high-side switch and a level conversion circuit as described above. A first conversion signal VOUT is used to input to the gate of the high-side switch to drive the high-side switch.

[0082] Furthermore, in order to better implement the level conversion circuit in any of the above embodiments, based on the level conversion circuit described above, this application embodiment also provides an electronic device, which includes the level conversion circuit described above or includes the high voltage high-side drive circuit described above.

[0083] In the above embodiments, the descriptions of each embodiment have different focuses. For parts that are not described in detail or recorded in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0084] The basic concepts have been described above. Obviously, for those skilled in the art, the detailed disclosure above is merely illustrative and does not constitute a limitation of this application. Although not explicitly stated herein, those skilled in the art may make various modifications, improvements, and corrections to this application. Such modifications, improvements, and corrections are suggested in this application, and therefore remain within the spirit and scope of the exemplary embodiments of this application.

[0085] Furthermore, this application uses specific terms to describe embodiments of the application. For example, "an embodiment," "one embodiment," and / or "some embodiments" refer to a particular feature, structure, or characteristic associated with at least one embodiment of the application. Therefore, it should be emphasized and noted that "an embodiment," "one embodiment," or "an alternative embodiment" mentioned twice or more in different locations in this specification do not necessarily refer to the same embodiment. In addition, certain features, structures, or characteristics in one or more embodiments of the application can be appropriately combined.

[0086] Similarly, it should be noted that, in order to simplify the description of the present application and thus aid in the understanding of one or more embodiments of the invention, the foregoing description of the embodiments of the present application sometimes combines multiple features into a single embodiment, drawing, or description thereof. However, this disclosure method does not imply that the subject matter of the application requires more features than those mentioned in the claims. In fact, the embodiments contain fewer features than all the features of the single embodiments disclosed above.

[0087] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application 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. Such 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 this application, and should all be included within the protection scope of this application.

Claims

1. A level conversion circuit, characterized in that, The level conversion circuit includes: The first level output unit is used to receive the first level signal; The second-level output unit is used to receive a second-level signal; The threshold determination unit has an input terminal and an output terminal. The input terminal is connected to the first level output unit and the second level output unit and is used to receive the first level signal or the second level signal. The output terminal is used to output a first conversion signal based on the level of the input terminal. The ability of the first level signal to adjust the input level is weaker than that of the second level signal to adjust the input level. A positive feedback module, connected to the input terminal and the output terminal, is used to positively adjust the level of the input terminal based on the first conversion signal. The positive feedback module includes a first positive feedback unit and a second positive feedback unit. The second positive feedback unit acquires the first conversion signal and outputs a second feedback signal to the input terminal based on the first conversion signal. The first positive feedback unit acquires the first conversion signal and outputs a first feedback signal to the input terminal based on the first conversion signal. The second feedback signal is a pulse signal, used to adjust the level of the input terminal to a first preset level before the first feedback signal. The first feedback signal is used to stabilize the level of the input terminal at a second preset level. The first feedback signal has a weaker ability to adjust the input level than the first level signal; the sum of the adjustment capabilities of the first feedback signal and the first level signal on the input level is weaker than the adjustment capability of the second level signal on the input level.

2. The level conversion circuit according to claim 1, characterized in that, The first positive feedback unit includes: A pull-up sub-unit is used to receive a high-level signal and output a first sub-feedback signal to pull the level of the input terminal high; The pull-down sub-unit is used to receive a low-level signal and output a second sub-feedback signal to pull the level of the input terminal low.

3. The level conversion circuit according to claim 2, characterized in that, The pull-up subunit includes a first pull-up bias and a first switch. One end of the first pull-up bias is used to receive a high-level signal, and the other end of the first pull-up bias is connected to the first switch. The other end of the first switch is connected to the input terminal. The control electrode of the first switch is connected to the output terminal. And / or, the pull-down subunit includes a first pull-down bias and a second switch, one end of the first pull-down bias is used to receive a low-level signal, the other end of the first pull-down bias is connected to the second switch, the other end of the second switch is connected to the input terminal; the control electrode of the second switch is connected to the output terminal.

4. The level conversion circuit according to claim 2, characterized in that, The sum of the adjustment capabilities of the first sub-feedback signal and the first level signal on the input terminal is less than the adjustment capability of the second level signal on the input terminal; And / or, the adjustment capability of the first level signal on the input terminal is greater than the adjustment capability of the second sub-feedback signal on the input terminal.

5. The level conversion circuit according to claim 1, characterized in that, The second positive feedback unit includes: A pulse generation subunit is connected to the output terminal and is used to detect the rising and falling edge changes of the first conversion signal, and generate a first pulse signal and a second pulse signal according to the rising and falling edge changes. A third switch and / or a fourth switch, wherein the third switch is configured to conduct based on the first pulse signal to connect a high-level signal to the input terminal and pull the level of the input terminal high; and the fourth switch is configured to conduct based on the second pulse signal to connect a low-level signal to the input terminal and pull the level of the input terminal low.

6. The level conversion circuit according to claim 5, characterized in that, The pulse generation subunit includes a time delay device, a first NOT gate device, an AND gate device, and an OR gate device; The first NOT gate device has a first input terminal and a first output terminal, the first input terminal is connected to the delay device, and the delay device is also connected to the output terminal; The OR gate device has a second input, a third input, and a second output. The second input is connected to the output terminal, and the third input is connected to the first output terminal. The second output terminal is used to output the first pulse signal. The AND gate device has a fourth input, a fifth input, and a third output. The fourth input is connected to the output terminal, and the fifth input is connected to the first output terminal. The third output terminal is used to output the second pulse signal.

7. The level conversion circuit according to claim 1, characterized in that, The threshold determination unit includes a second NOT gate and a first Schmitt trigger connected in series. The other end of the first Schmitt trigger is the input terminal, and the other end of the second NOT gate is the output terminal.

8. The level conversion circuit according to claim 1, characterized in that, The level conversion circuit further includes a second Schmitt trigger, which is disposed on the output terminal, and the positive feedback module is connected between the threshold determination unit and the second Schmitt trigger.

9. The level conversion circuit according to claim 1, characterized in that, The first level output unit includes a second pull-up bias, one end of which is used to receive a high-level signal, and the other end of which is connected to the input terminal. And / or, the second level output unit includes a second pull-down bias and a fifth switch connected in series, the other end of the second pull-down bias is used to receive a low-level signal, the other end of the fifth switch is connected to the input terminal, and the control terminal of the fifth switch is used to receive a second conversion signal.

10. A high-voltage high-side drive circuit, characterized in that, It includes a high-side switch and a level conversion circuit as described in any one of claims 1 to 9, wherein the first conversion signal is used to be input to the gate of the high-side switch to drive the high-side switch.

11. An electronic device, characterized in that, The electronic device includes a level conversion circuit as described in any one of claims 1 to 9 or a high-voltage high-side drive circuit as described in claim 10.

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