Demodulation device for isolation switch driving control and driving method thereof

Abstract

The invention relates to the field of isolation switch driving control, in particular to a demodulation device for isolation switch driving control and a driving method of the demodulation device. Waveform shaping is carried out on an input modulation signal, the modulation signal is converted into a high-frequency square wave signal, high-frequency components are filtered out through a low-pass filter, and a stable digital signal is obtained; the method comprises the following steps: carrying out delay processing on a modulation signal containing logic jump to ensure that the delay width can cover the low level width of the signal, controlling a clock of a delay timer through a control logic module according to the low level part of the modulation signal to avoid generating a rising edge signal, and outputting a reset pulse signal and a driving low signal when a specific condition is met. When other conditions are detected, the register is triggered to sample a high-level signal and output a driving high signal, interference can be effectively filtered, the amplitude and the phase of the signal are kept stable, and low delay is achieved in the signal conversion process so as to ensure the accuracy of signal transmission.

Description

Technical Field

[0001] The invention relates to the field of drive control for isolating switches, in particular to a demodulation device for drive control of isolating switches and a drive method thereof. Background Art

[0002] In existing isolated drive control technologies, the control signal on the primary side is usually a low-frequency or DC signal, which is difficult to transmit directly to the secondary side through isolation. Therefore, in order to achieve isolated transmission, the control signal is first converted into a high-frequency signal or a modulated signal in a specific format. Through this conversion, the signal can be isolated and transmitted using inductive coupling, transformer coupling or optical coupling devices.

[0003] When analyzing the high-frequency signal on the primary side, the existing demodulation method will be affected by the noise interference and amplitude change of the signal, resulting in distortion of the demodulated signal. Especially when the environmental noise is large or there is electromagnetic interference on the secondary side, the demodulation error is large, affecting the accuracy of the control signal.

[0004] Existing demodulation circuits may contain multiple stages of filtering, amplification, and shaping processes, which increase demodulation delay to a certain extent, resulting in insufficient real-time control signal transmission. When the system needs to respond quickly, such as in high-speed equipment control in industrial automation, demodulation delay will limit the system's response speed.

[0005] In order to solve the above problems, the field of isolation control requires a new demodulation mechanism that can accurately restore the modulated signal without being affected by electrical interference from the primary and secondary sides, while having the ability to respond quickly. Summary of the invention

[0006] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a demodulation device and a driving method for isolating switch drive control that can effectively filter interference, maintain signal amplitude and phase stability, and achieve lower delay in the signal conversion process to ensure the accuracy of signal transmission.

[0007] To achieve the above object, the present invention provides the following technical solutions: A demodulation device for isolating switch drive control, comprising: A waveform shaping module is used to shape the received modulated signal into a high-frequency square wave signal and adjust the amplitude of the signal; A low-pass filtering module, connected to the waveform shaping module, for filtering out high-frequency components in the shaped signal to obtain a digital signal without a high-frequency waveform; A delay processing module, connected to the low-pass filtering module, is used to perform delay processing on the high level in the specific modulation signal, and the delay width can cover the width of the low-level signal and is less than the width of the signal half cycle; A control logic module is connected to the delay processing module, the control logic module includes a control logic unit and a delay timer, the control logic unit turns off the clock of the delay timer according to the low level signal of the modulation signal to prevent the delay timer from generating a rising edge signal, thereby outputting a logic 0 signal; A reset unit, connected to the control logic module, for outputting a reset pulse signal to drive a low signal output when the control logic module detects a specific modulation signal; The register unit is connected to the control logic module and is used to sample a high level and send a driving high signal when the control logic module detects another modulation signal.

[0008] The present invention is further configured as follows: the waveform shaping module includes a shaping circuit for converting the modulated signal into a square wave signal suitable for demodulation.

[0009] The present invention is further configured such that: the delay width of the delay processing module is dynamically adjusted according to specific signal characteristics to adapt to demodulation requirements of different signal periods.

[0010] The present invention is further configured as follows: the control logic module further includes a first control logic unit and a second control logic unit to process a logic 0 to logic 1 transition signal and a logic 1 to logic 0 transition signal respectively.

[0011] The present invention is further configured such that the shutdown of the delay timer is controlled by a low-level signal, thereby maintaining a logic 0 output during the delay period.

[0012] A driving method for a demodulation device for driving control of an isolating switch comprises the following steps: S1, waveform shaping is performed on the input modulation signal to convert it into a high-frequency square wave signal; S2, filter out high-frequency components through a low-pass filter to obtain a stable digital signal; S3, delaying the modulated signal including the logic jump to ensure that the delay width can cover the low level width of the signal; S4, controlling the clock of the delay timer according to the low level part of the modulation signal through the control logic module to avoid generating a rising edge signal; S5, outputting a reset pulse signal and driving a low signal when a specific condition is met; S6. When other conditions are detected, the register is triggered to sample a high-level signal and the output drives a high signal.

[0013] Compared with the shortcomings of the prior art, the beneficial effects of the present invention are: Multiple signal processing methods such as waveform shaping, low-pass filtering, delay processing and control logic modules are adopted, so that the input modulated signal can be efficiently and accurately restored to a digital signal, which significantly improves the demodulation accuracy and ensures the accuracy of signal restoration in isolated drive control.

[0014] By optimizing control logic and delay processing, the delay in signal processing is reduced, allowing the system to respond quickly to changes in input signals. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the process of the present invention; Figure 2 Schematic diagram of modulation signal of the present invention. DETAILED DESCRIPTION

[0016] Reference Figure 1 to Figure 2 The embodiments of the present invention are further described.

[0017] A demodulation device for isolating switch drive control, comprising: Waveform shaping module: The main function is to receive the modulated signal sent by the main stage, convert it into a high-frequency square wave signal, and adjust the signal amplitude so that the subsequent circuit can more easily identify and process the signal. The frequency or amplitude of the modulated signal may change, and through the processing of the waveform shaping module, the shape and amplitude of the signal can be standardized, so that the subsequent modules can work more stably. The waveform shaping module may include a shaping circuit, which can be a high-frequency shaping circuit or a shaping circuit based on voltage adjustment. Its main principle is to perform a shaping operation on the input signal, adjust it to a square wave, and unify the amplitude at the same time. The output of the module is a standardized high-frequency square wave signal, which makes the signal characteristics clearer and facilitates subsequent filtering and delay processing.

[0018] Low-pass filter module: used to filter the shaped high-frequency square wave signal, remove high-frequency noise components, and make the signal closer to a pure digital signal. The purpose of this is to eliminate high-frequency noise or interference that may be generated during the modulation process, and ensure that the signal transmitted to the secondary side is more stable and accurate. The low-pass filter module can use a conventional low-pass filter circuit, such as an RC low-pass filter circuit or an active low-pass filter circuit. Its design bandwidth should be appropriately selected to filter out high-frequency components and retain only the low-frequency part of the digital signal. After this step, the signal becomes purer, eliminating most of the high-frequency interference components, providing a more ideal signal foundation for the next step of delay processing.

[0019] Delay processing module: Receives the filtered signal and performs delay processing on the specific high-level signal part. The delay time is set to ensure that the low-level width of the signal can be covered, but it is less than half the period of the signal. This processing can retain the critical low-level part in the modulated signal, so that the subsequent control logic module can judge and output the signal based on the existence or width of the low level. The delay processing module can be implemented by a delay circuit or a timer circuit, such as using a delay line with adjustable bandwidth or a programmable delay timer. The width of the delay processing module can be dynamically adjusted according to the periodic characteristics of the signal to adapt to different signal periods and jump characteristics. Through this adjustment, it is ensured that the signal after delay processing maintains the correct width so that the subsequent control logic module can correctly identify the signal state.

[0020] Control logic module: mainly responsible for identifying the logic jump in the signal, and controlling the clock of the delay timer based on the low-level signal to prevent the delay timer from sending a rising edge signal, thereby maintaining the logic 0 output. The module includes a first control logic unit and a second control logic unit, which are used to process the jump from logic 0 to logic 1 and the jump from logic 1 to logic 0 respectively. The control logic module can be implemented based on digital logic circuits, including simple gate circuits and triggers. The module is designed with two control logic units to handle different logic jump modes. By monitoring the low-level signal, the control logic module turns off the clock signal of the delay timer to ensure that it maintains the logic 0 output. This logic design avoids false signal jumps and ensures accurate signal transmission.

[0021] Reset unit: used to output a reset pulse when the control logic module detects a specific modulation signal, thereby driving the output of a low signal. This function ensures that when specific conditions are met, the system can automatically reset to a low-level state to prevent false triggering caused by signal interference. The reset unit can be implemented using a pulse generation circuit or a reset trigger. Specifically, it can automatically generate a reset pulse after detecting a low-level signal. The trigger condition of the pulse can be set to a specific logic signal of the control logic module to ensure that it is reset to a low-level signal output state when necessary. This module ensures that the system can return to normal in a timely manner when interference occurs.

[0022] Register unit: used to detect the high-level signal output by the control logic module. When the logic jumps to a high level, the register samples the high level and sends a drive high signal. This can effectively distinguish between the low-level reset signal and the high-level drive signal to achieve precise signal output control. The register unit can use register circuits such as D flip-flops to trigger sampling through high levels to achieve the output of drive signals. The register unit can be set to respond to specific rising edge signals and keep the output high when sampling to a high level. This design ensures that the register accurately drives the execution unit when the signal jumps to a high level to achieve control output.

[0023] The driving method of the demodulation device for isolating switch drive control comprises the following steps to realize accurate demodulation of isolating switch drive control: Modulated Signal: The input modulated signal contains logic information (such as the transition from logic 0 to logic 1 or logic 1 to logic 0), which is transmitted from the primary side to the secondary side through coupling. This signal needs to go through a subsequent demodulation step to recover the original digital information.

[0024] Waveform Shaping: This module shapes the modulated signal, converts it into a high-frequency square wave signal and adjusts the signal amplitude. This process ensures that the signal shape is uniform and easy to identify by subsequent circuits, eliminating the influence of irregular waveforms.

[0025] LPF (Low Pass Filter): The low pass filter is used to remove high frequency components and output a pure digital signal. The goal of this step is to eliminate the high frequency noise generated during the modulation process and make the signal closer to an ideal square wave in subsequent processing.

[0026] Delayer (delay processing module): The delay module delays the specific high-level part of the signal, and the delay time is set to cover the width of the low-level signal, but not more than half the cycle of the signal. This step ensures that the low-level signal can maintain a certain width, so that the control logic module can identify and distinguish the types of different jump signals.

[0027] Ctrl_logic1 and Ctrl_logic2 (control logic 1 and control logic 2): The control logic unit uses the delayed signal to process the transition from logic 0 to 1 and from logic 1 to 0 respectively. Its main function is to identify the rising edge or low level segment of the signal, and control the clock of the delay timer by controlling the low level signal, so that the timer cannot generate a rising edge signal under certain circumstances and outputs a logic 0.

[0028] Delay Timer (delay processing timer): This module is used in conjunction with the control logic module to control the working state of the delay timer through a low-level signal. When the low-level signal of modulated signal2 is detected, the clock of the delay timer is turned off, so that the rising edge signal cannot be output and the logic 0 state is maintained.

[0029] Reset Pulse: When the control logic detects a specific signal change, a reset pulse signal is issued to reset the trigger and drive the low signal output (Drv low), ensuring the accuracy of the signal state through reset.

[0030] Posedge (rising edge signal): For another modulated signal (modulated signal1), when the control logic detects the rising edge, the trigger register samples the high level and drives the high signal (Drv high) output to complete the high level transmission of the signal.

[0031] The demodulation device and driving method of the present invention realize high-precision demodulation of the input modulation signal through the above steps, effectively isolate the electrical connection between the primary side and the secondary side, and can still maintain the integrity and accuracy of the signal in a noisy environment. Through the cooperation of the reset unit and the register unit, the reset of the logic low level and the driving of the logic high level are realized, effectively ensuring the stability and reliability of the isolation control system.

[0032] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Common changes and substitutions made by those skilled in the art within the scope of the technical solution of the present invention should be included in the protection scope of the present invention.

Claims

1. A demodulation device for isolating switch drive control, characterized in that: include: A waveform shaping module is used to shape the received modulated signal into a high-frequency square wave signal and adjust the amplitude of the signal; A low-pass filtering module, connected to the waveform shaping module, for filtering out high-frequency components in the shaped signal to obtain a digital signal without a high-frequency waveform; A delay processing module, connected to the low-pass filtering module, is used to perform delay processing on the high level in the specific modulation signal, and the delay width can cover the width of the low-level signal and is less than the width of the signal half cycle; A control logic module is connected to the delay processing module, the control logic module includes a control logic unit and a delay timer, the control logic unit turns off the clock of the delay timer according to the low level signal of the modulation signal to prevent the delay timer from generating a rising edge signal, thereby outputting a logic 0 signal; A reset unit, connected to the control logic module, for outputting a reset pulse signal to drive a low signal output when the control logic module detects a specific modulation signal; The register unit is connected to the control logic module and is used to sample a high level and send a driving high signal when the control logic module detects another modulation signal.

2. A demodulation device for isolating switch drive control according to claim 1, characterized in that: The waveform shaping module includes a shaping circuit for converting a modulated signal into a square wave signal suitable for demodulation.

3. A demodulation device for isolating switch drive control according to claim 2, characterized in that: The delay width of the delay processing module is dynamically adjusted according to specific signal characteristics to meet the demodulation requirements of different signal periods.

4. A demodulation device for isolating switch drive control according to claim 3, characterized in that: The control logic module further includes a first control logic unit and a second control logic unit to process a logic 0 to logic 1 transition signal and a logic 1 to logic 0 transition signal respectively.

5. A demodulation device for isolating switch drive control according to claim 1, characterized in that: The shutdown of the delay timer is controlled by a low-level signal, thereby maintaining a logic 0 output during the delay period.

6. A driving method for a demodulation device for driving control of an isolating switch according to claims 1-5, comprising the following steps: S1, waveform shaping is performed on the input modulation signal to convert it into a high-frequency square wave signal; S2, filter out high-frequency components through a low-pass filter to obtain a stable digital signal; S3, delaying the modulated signal including the logic jump to ensure that the delay width can cover the low level width of the signal; S4, controlling the clock of the delay timer according to the low level part of the modulation signal through the control logic module to avoid generating a rising edge signal; S5, outputting a reset pulse signal and driving a low signal when a specific condition is met; S6. When other conditions are detected, the register is triggered to sample a high-level signal and the output drives a high signal.

Images