Ultrasonic power amplifier protection control system

Abstract

The invention discloses an ultrasonic power amplifier protection control system which comprises a power amplifier module, a multi-channel signal detection module, a logic control circuit, a latch circuit, a microcontroller and a protection execution module. The multi-channel signal detection module collects various signals of the power amplifier module, and the logic circuit receives feedback signals and external signals of the multi-channel signal detection module and operates and outputs control signals. When the latch circuit is abnormal, the protection instruction is locked, and the microcontroller receives the output of the logic circuit. The system has a plurality of optimization mechanisms, a logic control circuit input signal adjustment mechanism, a multi-path signal detection module comprising a plurality of detection elements and a sampling frequency adjustment mechanism, a microcontroller and logic circuit communication error correction mechanism, a logic circuit operation rule expansibility mechanism, and a signal input end priority mechanism. The multi-channel signal detection module is provided with a preprocessing module. According to the invention, the power amplifier module can be protected through hardware and software, and the latch circuit provides third protection, so that the safety, comprehensiveness and stability are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of ultrasonic power amplifier module, and particularly to an ultrasonic power amplifier protection control system. BACKGROUND

[0002] The ultrasonic power amplifier module is an important part of the ultrasonic system, which converts the mains into high-frequency high-voltage alternating current signal to drive the ultrasonic transducer. During the ultrasonic welding process, when the system has related abnormalities, the power amplifier module must enter the protection control, otherwise the ultrasonic system will have serious damage that cannot be recovered, and may cause safety problems. Therefore, the research on the protection control mechanism of the ultrasonic power amplifier module has very important value.

[0003] The common ultrasonic power amplifier protection control system detects the data of the power amplifier module in real time, and when the data of the power amplifier module is detected to be abnormal, the power supply of the power amplifier module is cut off to prevent it from continuing to output. However, this way has single ultrasonic power amplifier protection function, thereby leading to limited protection range, and the protection cannot be realized during the system alarm reset, resulting in poor protection performance of the ultrasonic power amplifier, which cannot meet the working requirements of the ultrasonic power amplifier module application. SUMMARY

[0004] The present application provides the following technical scheme: an ultrasonic power amplifier protection control system, comprising: a power amplifier module, a multi-channel signal detection module, a logic control circuit, a latch circuit, a microcontroller and a protection execution module; The power amplifier module is used to convert the mains into high-frequency high-voltage alternating current signal and drive the transducer. The power amplifier module is electrically connected with the multi-channel signal detection module, and the multi-channel signal detection module is used to collect the feedback signal of the power amplifier module in real time. The logic control circuit is electrically connected with the latch circuit, and the logic control circuit is used to receive the feedback signal collected by the multi-channel signal detection module, an external emergency stop signal, an enable signal and a reset signal, and output to the protection execution module and the microcontroller through logic operation. Output to the protection execution module: When the logic control circuit detects that the power amplifier module has abnormal conditions (such as voltage, current, power, temperature or frequency signal exceeding the normal range), the protection execution module (including a relay and a solid-state switch) is controlled by this signal to cut off the driving power supply of the power amplifier module, and the power amplifier module is protected by hardware; output to the microcontroller: The signal transmits the state information (such as whether abnormal) of the power amplifier module to the microcontroller. After receiving the signal, the microcontroller further analyzes the state of the power amplifier module according to the historical fault data stored in the internal storage module and the detection logic of the microcontroller itself. If the microcontroller detects that the data is normal, the microcontroller sends an enable signal to the internal logic control circuit to allow the logic control circuit to continue to control. If the microcontroller detects that the data is abnormal, the microcontroller locks the software layer and does not send an enable signal to the logic control circuit, thereby realizing the protection of the software layer. At the same time, the microcontroller also displays the fault category and protection state in real time through the display module connected by the interface.

[0005] The latch circuit is used for locking the protection instruction in the abnormal state. The latch circuit is used for locking the protection instruction in the abnormal state. The set input signal of the logic control circuit is provided with an adjustment mechanism. The output end of the logic control circuit is connected to the input end of the latch circuit through a line. The latch circuit is indirectly associated with the microcontroller through the connection with the logic control circuit. The latch circuit is indirectly associated with the protection execution module through the logic control circuit. The microcontroller is used for receiving the second output signal of the logic control circuit. The input end of the microcontroller is connected to the output end of the logic control circuit through a line. The interface end of the microcontroller is connected to the connection end of the display module through a line. The power amplifier module is used for converting the mains into high-frequency high-voltage alternating current signals and driving the transducer. The protection execution module is connected to the logic control circuit. The power amplifier module is electrically connected to the multi-channel signal detection module. The output end of the multi-channel signal detection module is connected to the set input end of the logic control circuit through a line. The output end of the logic control circuit is connected to the protection execution module. At the same time, the second output signal of the logic control circuit is output to the microcontroller. The protection execution module is used for cutting off the driving power supply of the power amplifier module.

[0006] Preferably, the set input signal of the logic control circuit is provided with an adjustment mechanism. The latch circuit adopts an RS flip-flop. The output end of the latch circuit is fed back to the input end of the logic control circuit, so that the protection state is continuously performed until manual reset.

[0007] Preferably, the multi-channel signal detection module includes a voltage transformer and a current transformer, a temperature sensor, and a frequency detection circuit. The voltage transformer and the current transformer are used for collecting voltage and current signals. The temperature sensor is attached to the surface of the heat sink of the power amplifier module. The frequency detection circuit is realized based on a zero-crossing comparator.

[0008] Preferably, the interface of the microcontroller is connected with a display module, the display module is used for displaying the fault category and protection state in real time, the protection execution module comprises a relay and a solid-state switch, and the protection execution module is used for cutting off the driving power supply of the power amplifier module.

[0009] Preferably, the logic operation rule inside the logic control circuit is provided with an extensibility mechanism, and based on the extensibility mechanism, the system can introduce a new sensor to detect a new physical quantity signal, including a new voltage standard, a current standard or a stability standard, and can incorporate the new physical quantity signal into the logic operation without changing the overall circuit architecture.

[0010] Preferably, the inside of the multi-channel signal detection module is additionally provided with a sampling frequency adjustment mechanism, and the sampling frequency adjustment mechanism adopts different sampling frequencies according to different working stages.

[0011] Preferably, the communication between the microcontroller and the logic control circuit is provided with an error correction mechanism, the error correction mechanism adopts error correction coding technology, and the system encodes the signal when the logic control circuit sends the second output signal to the microcontroller, and then decodes and verifies the signal received by the microcontroller.

[0012] Preferably, the inside of the microcontroller is installed with a storage module, the storage module is used for storing historical fault data, and the historical fault data includes the time of fault occurrence, the fault type and the working parameter information of the power amplifier module at that time.

[0013] Preferably, the signal input end of the logic control circuit is provided with a priority mechanism, and the priority mechanism sets different priorities according to the importance of the signal to the safety of the power amplifier module when processing the feedback signal collected by the multi-channel signal detection module, the external emergency stop signal, the enable signal and the reset signal.

[0014] Preferably, the inside of the multi-channel signal detection module is additionally provided with a preprocessing module, the preprocessing module is used for preprocessing the collected signals, and the preprocessing module normalizes the collected signals to convert signals of different physical quantity ranges into a unified numerical range.

[0015] Compared with the prior art, the ultrasonic power amplifier protection control system has the following beneficial effects: 1、The present application can input the voltage data, power data, current data and temperature data of the power amplifier module as feedback signals into the internal part of the logic control circuit through the multi-channel signal detection module, the logic control circuit can monitor each data of the power amplifier module through the set input value, when one or more data in the input signal is detected to be abnormal, a signal is sent to the protection execution module, the protection execution module cuts off the driving power supply of the power amplifier module after receiving the signal to implement the protection in the hardware aspect, and the logic control circuit sends a signal to the internal part of the microcontroller synchronously when accepting the data, the microcontroller detects the data synchronously, when the microcontroller detects that the data is normal, an enable signal is sent to the internal part of the logic control circuit, the logic control circuit can be controlled, when the microcontroller detects that the data is abnormal, the software layer is locked and the enable signal is not sent to the internal part of the logic control circuit, so that the multiple protection in the software layer is achieved, and the safety is improved; 2、The present application can send a protection signal to the internal part of the latch circuit for latching when the logic control circuit outputs the protection signal, so that the logic control circuit has no signal output during the reset period, only after manual reset, the logic control circuit has a signal output, so that the third protection is achieved through the added latch circuit, and the comprehensiveness and stability of the whole protection process are improved. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is the flow chart of the ultrasonic power amplifier protection control system of the present application.

[0017] Figure 2 is the system structure diagram of the present application. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present application will be described clearly and completely in combination with the drawings in the embodiments of the present application, obviously, the described embodiments are only part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the protection scope of the present application.

[0019] Embodiment one Please refer to Figure 1 and Figure 2 , the present application provides a technical solution, an ultrasonic power amplifier protection control system, comprising: a power amplifier module, a multi-channel signal detection module, a logic control circuit, a latch circuit, a microcontroller and a protection execution module; The power amplifier module is used for converting the commercial power into high-frequency high-voltage alternating current signals and driving the transducer; The power amplifier module is electrically connected with the multi-channel signal detection module, the multi-channel signal detection module is used for collecting feedback signals of the power amplifier module in real time, the set input signal of the logic control circuit is provided with an adjusting mechanism, the latch circuit adopts an RS flip-flop, and the output end of the latch circuit is fed back to the input end of the logic control circuit, and the protection state is continuously maintained until manual reset; In the ultrasonic wave power amplifier protection control system, the reset signal is input to the logic control circuit. When the system is abnormal, the latch circuit adopts an RS flip-flop, which will lock the protection instruction in the abnormal state, so that the system continuously maintains the protection state. This protection state will be maintained until the manual reset operation is performed. The manual reset operation is associated with the latch circuit, which functions to release the protection locking state of the latch circuit, so that the system can resume normal operation or re-perform the logic operation of the logic control circuit. In this process, the reset signal, as one of the input signals of the logic control circuit, participates in the logic operation together with the external emergency stop signal, the enable signal and the feedback signal collected by the multi-channel signal detection module, and the latch circuit locks the protection instruction in the abnormal state according to the operation result, and the locking is released through manual reset, so as to realize the control of the system protection state. The output end of the logic control circuit is connected with the input end of the latch circuit through a line, the latch circuit is indirectly associated with the microcontroller through the connection with the logic control circuit, and the latch circuit is indirectly associated with the protection execution module through the logic control circuit; The logic control circuit is electrically connected with the latch circuit, and is used for receiving the feedback signal collected by the multi-channel signal detection module, the external emergency stop signal, the enable signal and the reset signal, and outputting to the protection execution module and the microcontroller through logic operation; Output to the protection execution module: When the logic control circuit detects that the power amplifier module has an abnormal condition (such as voltage, current, power, temperature or frequency signal exceeding the normal range), the protection execution module (including a relay and a solid-state switch) is controlled to cut off the driving power supply of the power amplifier module through this signal, so as to protect the power amplifier module by hardware; output to the microcontroller: This signal transmits the state information (such as whether abnormal) of the power amplifier module to the microcontroller. After receiving the signal, the microcontroller further analyzes the state of the power amplifier module according to the historical fault data stored in the internal storage module and the detection logic of the microcontroller itself. If the microcontroller detects that the data is normal, it will send an enable signal to the internal logic control circuit, allowing the logic control circuit to continue to control; if the detection data is abnormal, the software layer is locked, and no enable signal is sent to the logic control circuit, so as to realize the protection of the software layer. At the same time, the microcontroller also displays the fault category and the protection state in real time through the display module connected by the interface; The latch circuit is used for locking the protection instruction in the abnormal state, and the latch circuit outputs two signals of logic calculation and judgment, one of which controls the power amplifier module, and the other outputs information to the microcontroller. The specific process of the above steps is as follows: Data acquisition and preprocessing: The voltage transformer and current transformer in the multi-channel signal detection module collect the voltage and current signals of the power amplifier module; the temperature sensor is attached to the surface of the heat sink of the power amplifier module to collect the temperature signal; the frequency detection circuit (based on zero-crossing comparator) collects the frequency signal. At the same time, according to different working stages, the sampling frequency adjustment mechanism is used to adjust the sampling frequency, high sampling frequency is used in the stage of fast signal change, and low sampling frequency is used in the stable working stage. The collected signals are transmitted to the preprocessing module in the multi-channel signal detection module. The preprocessing module first performs filtering processing on the signals, such as using a low-pass filter to remove high-frequency noise and a mean filter to reduce random noise. Then, normalization processing is performed to convert signals of different physical quantity ranges into a unified numerical range. The preprocessed signals are transmitted to the logic control circuit as feedback signals. At the same time, external emergency stop signals, enable signals and reset signals are also transmitted to the logic control circuit. The signal input end of the logic control circuit processes these signals according to the priority mechanism, and the external emergency stop signal has the highest priority. Once it is received, the corresponding processing is performed immediately; Logic operation of the logic control circuit: According to the extension mechanism set in the logic control circuit, the system can introduce new sensor signals to detect new physical quantities, including new voltage standards, current standards or stability standards, without changing the overall circuit architecture. And the set input signal of the logic control circuit has an adjustment mechanism, which can adjust the input value according to the actual demand. According to the above signals (including the feedback signals collected by the multi-channel signal detection module after priority processing, the external emergency stop signal, the enable signal and the reset signal), the logic control circuit performs operation according to its logic operation rules. In the logic operation process, the output state of the latch circuit is considered. If the system is in an abnormal state, the latch circuit will lock the protection instruction (the latch circuit uses RS flip-flop, and its output end feeds back to the input end of the logic control circuit, which maintains the protection state until manual reset), which will affect the logic operation result of the logic control circuit; The logic control circuit outputs two signals: one signal is outputted after logic operation to control the power amplifier module. If the power amplifier module has abnormal conditions (for example, the voltage, current, power, temperature or frequency signal collected exceeds the normal range), the signal will be cut off by the protection execution module (including a relay and a solid-state switch) to shut down the driving power supply of the power amplifier module for hardware protection, and the logic control circuit outputs another signal to the microcontroller. In the output process, error correction coding technology is used to ensure the accuracy of communication. The logic control circuit encodes the signal first, and the microcontroller decodes and verifies the signal after receiving it. After receiving the signal, the microcontroller further analyzes the state of the power amplifier module according to the historical fault data (including the time of fault occurrence, fault type and working parameters of the power amplifier module at that time) stored in its internal storage module and its own detection logic. If the detection data is normal, the microcontroller will send an enable signal to the internal logic control circuit to allow the logic control circuit to continue to control; if the detection data is abnormal, the software layer will be locked and no enable signal will be sent to the logic control circuit to achieve software protection. Moreover, the microcontroller displays the fault category and protection state in real time through the display module connected by the interface. The microcontroller is used to receive the second output signal of the logic control circuit, the input end of the microcontroller is connected with the output end of the logic control circuit through a line, and the interface end of the microcontroller is connected with the connection end of the display module through a line. The power amplifier module is used to convert the mains into high-frequency high-voltage alternating current signals and drive the transducer, the protection execution module is connected with the logic control circuit, the power amplifier module is electrically connected with the multi-channel signal detection module, the output end of the multi-channel signal detection module is connected with the set input end of the logic control circuit through a line, the output end of the logic control circuit is connected with the protection execution module, and the second output signal of the logic control circuit is outputted to the microcontroller, and the protection execution module is used to cut off the driving power supply of the power amplifier module. The multi-channel signal detection module comprises a voltage transformer, a current transformer, a temperature sensor and a frequency detection circuit, the voltage transformer and the current transformer are used to collect voltage and current signals, the temperature sensor is attached to the surface of the heat sink of the power amplifier module, and the frequency detection circuit is realized based on a zero-crossing comparator. The microcontroller is connected with the display module through an interface, the display module is used to display the fault category and protection state in real time, the protection execution module comprises a relay and a solid-state switch, and the protection execution module is used to cut off the driving power supply of the power amplifier module. The logic operation rule in the logic control circuit is provided with an extensibility mechanism, which can introduce a new sensor to detect a new physical quantity without changing the overall circuit architecture, and the new physical quantity signal can be included in the logic operation. The specific process of the above method is: Collection and processing of new physical quantity signal: When a new sensor is introduced, the new sensor starts to detect a new physical quantity. For example, the new sensor can be a sensor that detects the vibration of a specific component inside the power amplifier module. The new sensor obtains an electrical signal related to the new physical quantity, which reflects the state information of the power amplifier module in a new aspect. Similar to the processing of other signals by the preprocessing module in the multi-channel signal detection module, if the new physical quantity signal needs preprocessing, similar methods can be used. For example, if the new signal has noise interference, filtering processing can be performed first, such as using appropriate filters (low-pass, high-pass, or band-pass filters, etc.) to remove noise components. If the numerical range of the new signal does not match the numerical range of other signals in the logic control circuit, normalization processing is also needed to convert it to a unified numerical range with other signals for subsequent logical operations; Adjustment preparation of logic control circuit: According to the working principle and protection requirements of the power amplifier module, the logical relationship between the new physical quantity signal and other existing input signals (such as feedback signals collected by the multi-channel signal detection module, external emergency stop signals, enable signals, and reset signals) is determined. For example, if the new physical quantity is a vibration signal, when the vibration exceeds a certain threshold and the current also exceeds the safe range at the same time, the protection mechanism may need to be triggered, which requires clear logical association. In the logic control circuit, the logical operation rules have the characteristics of modularity. Find the logical operation module related to the logical relationship of the new signal. Since the extensibility mechanism does not change the overall circuit architecture, it is not necessary to make large-scale changes to the physical structure of the circuit. Instead, the logical operation module is updated through software programming or simple hardware configuration adjustment (such as adjusting the connection method of logic gates or the internal parameters of logic chips, etc.). For example, if the logic control circuit uses a programmable logic device (PLD), the processing logic for the new signal can be added by reprogramming; Integrate the new signal into the logic operation: connect the processed new physical quantity signal to the corresponding input port of the logic control circuit. The selection of this port should be based on the design of the logic operation rule to ensure that the new signal can correctly participate in the logic operation. In the logic operation process of the logic control circuit, the new physical quantity signal will be operated with other input signals according to the updated logic operation rule. For example, if the original logic operation rule is to perform logical operations such as AND, OR, NOT on voltage, current and other signals based on Boolean algebra, now the new physical quantity signal will be added to these operations according to the determined logic relationship. For example, when the new signal is a vibration signal, it may increase the logic operation such as "if the vibration signal exceeds the standard and (voltage signal is abnormal or current signal is abnormal) then trigger protection". According to the result of the new signal after being integrated into the logic operation, it may be necessary to adjust the two-way control signals output to the power amplifier module and the microcontroller. If the addition of the new signal causes the protection judgment condition of the power amplifier module to change, the signal output to the protection execution module (control power amplifier module) should be changed accordingly. Similarly, if the signal output to the microcontroller involves new fault categories or protection state information, it also needs to be adjusted. For example, if the new physical quantity signal triggers a new protection state, the signal output to the microcontroller should contain information about this new state so that the microcontroller can correctly process and display the relevant fault category and protection state on the display module. The sampling frequency adjustment mechanism is added inside the multi-channel signal detection module, which uses different sampling frequencies according to different working stages. The specific process of the above method is as follows: Working stage determination: when the system starts, it is determined that the system enters the starting stage through a specific starting detection circuit or according to the initial power-on signal of the power amplifier module. In this stage, the voltage, current, power, temperature and frequency of the power amplifier module may change rapidly because the power amplifier module is transitioning from the initial state to the normal working state. When the parameters of the power amplifier module (such as voltage, current, etc.) remain relatively stable within a certain time and the fluctuation range is within the preset stable threshold, it is determined that the system enters the stable working stage. This stable threshold can be set according to the technical specifications of the power amplifier module and actual running experience. When there is a signal indicating that the voltage, current, power, temperature or frequency of the power amplifier module exceeds the normal range in the signals received by the logic control circuit (feedback signals collected by the multi-channel signal detection module, external emergency stop signals, enable signals and reset signals), it is determined that the system enters the abnormal stage. Sampling frequency setting: In the starting stage, due to the rapid change of parameters, it is necessary to set a high sampling frequency. According to the characteristics and protection requirements of the power amplifier module, a high sampling frequency value suitable for the starting stage is determined, for example, it can be set to sample once per millisecond. This sampling frequency can quickly capture the various parameter changes of the power amplifier module during the starting process, ensuring that critical signal change information is not missed. In the stable working stage, due to the relatively slow change of parameters, in order to reduce the system operation burden, reduce power consumption and improve overall efficiency, a lower sampling frequency can be set. According to experience and system performance requirements, a low sampling frequency value suitable for the stable working stage is determined, for example, it can be set to sample once per second. In the abnormal stage, in order to more accurately monitor the state change of the power amplifier module, the sampling frequency is increased again. Since the parameters of the power amplifier module may fluctuate unstably at this time, a higher sampling frequency helps to obtain accurate abnormal information in time. The sampling frequency can be set to sample once per microsecond to quickly obtain detailed parameter changes during the abnormal period and provide more accurate data support for subsequent protection decisions; Sampling frequency adjustment implementation: According to the determination result of the working stage, the control unit (which can be a special microcontroller or logic circuit) inside the multi-channel signal detection module generates a sampling frequency adjustment instruction. For example, when it is determined to enter the stable working stage from the starting stage, the control unit generates an instruction to adjust the sampling frequency from high frequency to low frequency; When it is determined to enter the abnormal stage, an instruction is generated to adjust the sampling frequency from low frequency to high frequency. Each sub-module (voltage transformer and current transformer, temperature sensor and frequency detection circuit) in the multi-channel signal detection module receives the sampling frequency adjustment instruction and adjusts its own sampling frequency according to the instruction. For example, the voltage transformer and current transformer adjust the internal sampling clock frequency according to the instruction to realize different frequency sampling of voltage and current signals; the temperature sensor adjusts its internal analog-to-digital conversion (ADC) sampling frequency; the frequency detection circuit adjusts its sampling period of the frequency signal, thereby realizing sampling of the feedback signal of the power amplifier module according to the set sampling frequency.

[0020] Embodiment two On the basis of embodiment one, an error correction mechanism is provided between the microcontroller and the logic control circuit. The error correction mechanism uses error correction coding technology. When the logic control circuit sends the second output signal to the microcontroller, the signal is first encoded, and then decoded and verified by the microcontroller after receiving the signal. The specific process of the above method is as follows: Logic control circuit end encoding operation: According to the performance requirements and communication reliability requirements of the system, determine the appropriate error correction encoding technology. For example, you can choose hamming code, cyclic redundancy check (CRC) code, etc. Assuming that hamming code is selected for encoding, the logic control circuit first arranges the signal to be sent before preparing to send the second output signal to the microcontroller. This includes arranging the signal according to the pre-defined format, such as combining different information (such as fault type, protection state, etc. Binary data) into a data block, and using the selected error correction encoding technology (such as hamming code) to encode the arranged signal data block. The hamming code encoding process involves calculating the check bits according to the data bits. For example, for a data block of a certain length, according to the hamming code encoding rules, the corresponding check bits are generated by performing specific logical operations (such as XOR operation, etc.) on the data bits, and the check bits are added to the original data block to form the encoded signal; Signal transmission: The logic control circuit sends the encoded signal to the microcontroller through a dedicated communication line (such as a data bus, etc.). During signal transmission, it may be affected by electromagnetic interference and other factors, resulting in signal errors; Microcontroller end decoding and checking operation: The microcontroller receives the encoded signal from the logic control circuit through its corresponding communication interface. If the encoded signal contains multiple parts (such as data part and check part), the microcontroller first separates the received encoded signal for processing, and uses the same error correction encoding technology (hamming code) as the logic control circuit encoding to decode the separated signal data part. For hamming code decoding, the microcontroller performs logical operations according to the hamming code decoding rules based on the received check bits and data bits to recover the original data information. After decoding, the microcontroller checks the recovered data. For hamming code, by calculating the check bits again and comparing them with the received check bits. If they are consistent, it means that the signal has not been corrupted during transmission, and the data can be considered correct. If the check result is inconsistent, it means that the signal transmission process has errors. If the check finds errors, the microcontroller can take appropriate measures. For example, it can send a request to the logic control circuit to retransmit the signal; or try to correct the error according to the error correction algorithm (for some encoding technologies with error correction capability, such as partial hamming code can correct single bit error). If the error cannot be corrected, the microcontroller can display a communication error prompt on the display module, and take some default protection measures, such as suspending related operations and waiting for communication to recover to normal; The microcontroller is internally installed with a storage module, which is used to store historical fault data, including the time of fault occurrence, fault type and working parameter information of the power amplifier module at that time; The signal input end of the logic control circuit is provided with a priority mechanism, which sets different priorities according to the importance of signals to the safety of the power amplifier module when processing the feedback signals collected by the multi-channel signal detection module, external emergency stop signals, enable signals and reset signals. The specific process of the above method is as follows: Determine the importance level of the signal: the external emergency stop signal has the highest priority. Because this signal usually needs to stop the operation of the power amplifier module immediately to avoid more serious safety accidents in emergency situations (such as finding that the power amplifier module is smoking, on fire, or the operator finds an emergency dangerous situation and manually triggers the emergency stop), the feedback signals of the multi-channel signal detection module are further subdivided according to the safety characteristics of the power amplifier module, for example, the current signal feedback may have a higher priority. If the current exceeds the safety threshold, it may directly cause the circuit elements of the power amplifier module to burn out, so the current signal anomaly is a relatively critical situation, the temperature signal feedback is also important. Excessive temperature may damage the key components such as semiconductor devices inside the power amplifier module, so the temperature signal anomaly also needs to be handled in time, and the priority of the voltage, power and frequency signal feedback is determined according to the specific design and safety requirements of the power amplifier module. Generally speaking, if the voltage is too high or too low, it may affect the normal work of the power amplifier module or even damage the elements, power anomalies may reflect the work efficiency and safety problems of the power amplifier module, frequency anomalies may affect the work effect of the transducer, etc. The priority of the enable signal is lower than that of the external emergency stop signal and the key feedback signal that may cause the power amplifier module to be damaged immediately (such as current, temperature, etc. abnormal feedback signal). The enable signal is mainly used to control whether the logic control circuit can perform normal logic operation and signal output, and plays a role when the power amplifier module is normally working or recovering from the pause state; The priority of the reset signal is the lowest. The reset signal is usually used to restore the system to a normal working state or reinitialize some parameters after the protection mechanism is triggered, but the reset operation can only be performed when the system is safe, so its priority is lower than that of other signals; Signal input queuing and processing: the logic control circuit monitors the signals at its input end at all times, including the feedback signals collected by the multi-channel signal detection module, the external emergency stop signal, the enable signal and the reset signal. When multiple signals arrive at the input end of the logic control circuit at the same time, the signals are queued according to the predetermined priority order. For example, if the external emergency stop signal and the current signal feedback arrive at the same time, the external emergency stop signal is processed first because it has the highest priority. For the signal with the highest priority, the logic control circuit immediately performs the corresponding operation according to the signal. For example, for the external emergency stop signal, the logic control circuit will immediately stop outputting the drive signal to the power amplifier module and send an instruction to the protection execution module to cut off the drive power supply of the power amplifier module. After processing the signal with the highest priority, if there are other signals waiting to be processed, the next signal is processed in order according to the priority. For example, after processing the external emergency stop signal, if the current signal feedback shows that the current is abnormal, the logic control circuit will perform logical operations according to the current abnormality to determine whether further protection measures need to be taken (such as adjusting the working parameters of the power amplifier module or triggering higher-level protection). For the enable signal, only when there is no emergency signal (such as the external emergency stop signal or critical feedback signal abnormality) with higher priority, the logic control circuit is enabled or disabled according to the state of the enable signal. For the reset signal, only when the system is in a safe state (such as all feedback signals showing normal, no external emergency stop signal, etc.), the system is reset according to the reset signal. The multi-channel signal detection module is internally provided with a preprocessing module. The processing module is used to preprocess the collected signals. At the same time, the processing module normalizes the collected signals and converts signals of different physical quantity ranges into a unified numerical range. The preprocessing steps include but are not limited to filtering the signals (such as using a low-pass filter to remove high-frequency noise and a mean filter to reduce random noise) and normalizing the signals, i.e. converting signals of different physical quantity ranges into a unified numerical range.

[0021] The voltage data, power data, current data and temperature data of the power amplifier module are inputted to the internal part of the logic control circuit as feedback signals through the multi-channel signal detection module, the logic control circuit can monitor each data of the power amplifier module by setting the input value, when one or more data in the input signal is abnormal, the signal is sent to the protection execution module, the protection execution module cuts off the driving power supply of the power amplifier module to implement the hardware protection, and the logic control circuit sends the signal to the internal part of the microcontroller synchronously when receiving the data, the microcontroller detects the data synchronously, when the microcontroller detects that the data is normal, the enable signal is sent to the internal part of the logic control circuit, and the logic control circuit can be controlled, when the microcontroller detects that the data is abnormal, the software layer is locked and the enable signal is not sent to the internal part of the logic control circuit, so that the multiple protection of the software layer is achieved, and the safety is improved.

[0022] Secondly, when the logic control circuit outputs the protection signal, the internal part of the latch circuit is latched synchronously, so that the logic control circuit has no signal output during the reset period, and only after the manual reset, the logic control circuit has the signal output, so that the third protection is realized through the added latch circuit, and the comprehensiveness and stability of the whole protection process are improved.

[0023] It should be noted that, in this document, the relationship terms such as first and second are used only to distinguish one entity or operation from another, and do not necessarily require or imply that there is any such actual relationship or order between these entities or operations. Moreover, the terms "include", "contain" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or equipment.

[0024] Although the embodiments of the present application have been shown and described, it is understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. An ultrasonic power amplifier protection control system, characterized by, The application relates to a power amplifier module, a multi-channel signal detection module, a logic control circuit, a latch circuit, a microcontroller and a protection execution module. The power amplifier module is used for converting commercial power into high-frequency high-voltage alternating-current signals and driving a transducer. The power amplifier module is electrically connected with the multi-channel signal detection module, and the multi-channel signal detection module is used for collecting feedback signals of the power amplifier module in real time. The logic control circuit is electrically connected with the latch circuit, the logic control circuit is used for receiving feedback signals collected by the multi-channel signal detection module, an external emergency stop signal, an enable signal and a reset signal, and outputs the signals to the protection execution module and the microcontroller through logic operation; and the latch circuit is used for locking protection instructions in an abnormal state. The latch circuit is used for locking protection instructions in an abnormal state, the set input signal of the logic control circuit is provided with an adjusting mechanism, the output end of the logic control circuit is connected with the input end of the latch circuit through a line, the latch circuit is indirectly associated with the microcontroller through the connection with the logic control circuit, and the latch circuit is indirectly associated with the protection execution module through the logic control circuit. The microcontroller receives a second-path output signal of the logic control circuit, the input end of the microcontroller is connected with the output end of the logic control circuit through a line, and the interface end of the microcontroller is connected with the connection end of a display module through a line. The protection execution module is connected with the logic control circuit, the power amplifier module is electrically connected with the multi-channel signal detection module, the output end of the multi-channel signal detection module is connected with the set input end of the logic control circuit through a line, the output end of the logic control circuit is connected with the protection execution module, meanwhile, the second-path output signal of the logic control circuit is output to the microcontroller, and the protection execution module is used for cutting off the driving power supply of the power amplifier module. The latch circuit adopts an RS flip-flop, the output end of the latch circuit is fed back to the input end of the logic control circuit, and the protection state is continuously maintained until manual reset.

2. The ultrasonic power amplifier protection control system of claim 1, wherein: The multi-channel signal detection module comprises a voltage transformer, a current transformer, a temperature sensor and a frequency detection circuit.

3. The ultrasonic power amplifier protection control system of claim 1, wherein: The interface of the microcontroller is connected with a display module, and the display module is used for displaying fault categories and protection states in real time.

4. The ultrasonic power amplifier protection control system of claim 1, wherein: The logic operation rule in the logic control circuit is provided with an expansibility mechanism, based on the expansibility mechanism, when a new sensor is introduced to detect a new physical quantity signal, the new physical quantity signal can be included in the logic operation without changing the overall circuit architecture.

5. The ultrasonic power amplifier protection control system of claim 1, wherein: The multi-channel signal detection module is internally provided with a sampling frequency adjusting mechanism, based on the sampling frequency adjusting mechanism, the sampling frequency is adjusted according to different working stages.

6. The ultrasonic power amplifier protection control system of claim 1, wherein: The communication between the microcontroller and the logic control circuit is provided with an error correction mechanism, the error correction mechanism adopts error correction coding technology, when the logic control circuit sends a second-path output signal to the microcontroller, the signal is first coded, and then the microcontroller receives the signal, decodes and checks the signal.

7. The ultrasonic power amplifier protection control system of claim 1, wherein: The microcontroller is internally provided with a storage module, and the storage module stores historical fault data.

8. The ultrasonic power amplifier protection control system of claim 1, wherein: ​ 9. The ultrasonic power amplifier protection control system of claim 1, wherein: The signal input end of the logic control circuit is provided with a priority mechanism, which sets different priorities according to the importance of signals to the safety of the power amplifier module when processing feedback signals collected by a multi-channel signal detection module, external emergency stop signals, enable signals and reset signals.

10. The ultrasonic power amplifier protection control system of claim 1, wherein: The multi-channel signal detection module is internally provided with a preprocessing module, which pre-processes the collected signals.

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