Frequency-shift signal transmitter and generation method

Abstract

The present application belongs to the technical field of track circuit, and discloses a frequency shift signal transmitter and a generating method, wherein the transmitter comprises a double CPU module, a signal generating and frequency back-checking module and a signal amplification and back-checking module. The output signal amplitude of the frequency shift signal transmitter is configured through communication, thereby reducing the engineering wiring of the output signal configuration signal amplitude, simplifying the device interface, reducing the fault points and the maintenance workload. The output signal amplitude of the frequency shift signal transmitter is configured remotely through communication, the output voltage of each transmitter can be pre-configured by software, thereby reducing the probability of the engineering personnel to incorrectly configure the transmitter voltage during construction. The frequency shift signal transmitter can finely adjust the amplitude of the output signal through the output voltage back-checking, thereby overcoming the problem that the existing transmitter has a large change amplitude of the output voltage signal under different load conditions, and improving the safety of the system.

Description

Technical Field

[0001] This invention belongs to the field of track circuit technology, and specifically relates to a frequency shift signal transmitter and its generation method. Background Technology

[0002] Track circuits are widely used in railways and urban rail transit. By checking the occupancy of the track circuit section, they provide the train's location information and information about the section ahead, ensuring the safe and efficient operation of the train.

[0003] In existing track circuits, a section may have multiple (two or more) ports. One port outputs a signal to the rail, and then receives the signal from other ends of the rail (receiving end). When a train occupies the track, the signal amplitude at the receiving end decreases. The indoor equipment determines whether a section is occupied by a train by detecting the amplitude of the received signal voltage.

[0004] To reduce interference with adjacent tracks and minimize power loss, the track circuit system adjusts the amplitude of the transmitted output signal based on the section's length, frequency, and minimum ballast resistance. This ensures that adjustments and coded signals are implemented while minimizing power loss and optimizing performance. However, current track circuit transmitters typically generate a fixed-amplitude signal source first, then use a power amplifier transformer to divide the output signal amplitude into several levels. These levels are then connected via jumpers to meet the transmission requirements of the track circuit, increasing maintenance complexity and the chance of errors during on-site construction.

[0005] For example, most high-speed railway lines in China currently use the ZPW-2000 series track circuits. The transmitter of this series of track circuits divides the output signal voltage into 10 levels through the power output transformer. According to the engineering needs, the manual configuration can be adjusted to output power output signals of different amplitudes.

[0006] The output of the track circuit transmitter is adjusted by an isolation transformer or a power amplifier transformer. In actual application, when the DC impedance of the external load changes, the AC load changes, or even short circuits occur, the output voltage of the signal may change significantly due to the internal resistance of the power amplifier circuit and the transformer loss (for example, when the external impedance is a certain capacitive load, the output voltage increases significantly). This deteriorates the applicability and safety of the system, or causes the transmitter and peripheral equipment to overheat, or even burn out the transmitter and peripheral equipment, affecting the availability of the system.

[0007] In summary, the current track circuit has the following problems:

[0008] 1. Current track circuit transmitters rely on engineering jumpers to meet the transmission requirements of track circuits, which increases maintenance difficulty and the chance of errors during on-site construction.

[0009] 2. The output voltage of the signal may fluctuate significantly, causing excessive output power of the transmitter, which may burn out this device and other equipment, and even reduce the safety of the system. Summary of the Invention

[0010] To address the above problems, this invention provides a frequency-shift signal transmitter and generation method, employing the following technical solution:

[0011] A frequency-shift signal transmitter includes a dual-CPU module, a signal generation and frequency feedback module, and a signal amplification and feedback module. The dual-CPU module controls the signal generation and frequency feedback module to generate a digital frequency-shift signal based on an acquired input signal. The signal generation and frequency feedback module also returns the carrier frequency period of the digital frequency-shift signal to the dual-CPU module. The dual-CPU module further performs feedback on the carrier frequency period of the digital frequency-shift signal; if the detection result meets requirements, it outputs a digital control command. The signal amplification and feedback module amplifies the acquired AC signal to generate a power output signal and feeds the power output signal back to the dual-CPU module. The AC signal is obtained by performing digital-to-analog conversion on the digital control command. The dual-CPU module also checks the voltage amplitude and frequency of the power output signal; if the detection result meets requirements, it controls a switching relay module to output the power output signal. The dual-CPU module also performs feedback on the voltage amplitude and current of the power output signal output by the signal amplification and feedback module, and adjusts the amplitude of the digital frequency-shift signal generated by the signal generation and frequency feedback module in real time.

[0012] Furthermore, it also includes a first secure AND gate module and a secure isolation module, wherein the dual CPU module is also used to output a dynamic signal to the first secure AND gate module when the carrier frequency cycle back check result of the digital frequency shift signal meets the requirements;

[0013] The first safety AND gate module is used to provide control power to the safety isolation module based on dynamic signals.

[0014] Furthermore, it also includes:

[0015] The digital-to-analog converter module is used to convert control commands from digital signals into AC signals and send them to the signal amplification and feedback module.

[0016] Furthermore, it also includes a second safety AND gate module, wherein the dual CPU module is also used to output a dynamic signal to the second safety AND gate module when the voltage amplitude and frequency detection results of the power output signal meet the requirements;

[0017] The second safety AND gate module is used to control the switching relay module to output the power signal based on the output dynamic signal.

[0018] Furthermore, it also includes an encoding method and address setting module, a dynamic input reading module, and a communication module; among which, the input signal includes address encoding, carrier frequency information, low-frequency encoding information, and output signal amplitude information;

[0019] The encoding method and address setting module is used to input the address encoding and encoding method into the dual-CPU module;

[0020] The dynamic input reading module is used to send the carrier frequency information and low-frequency encoding information obtained from the relay circuit to the dual-CPU module;

[0021] When the encoding method is communication encoding, the communication module is used to send the acquired carrier frequency information, low frequency encoding information and output signal amplitude information to the dual CPU module, and output the device status; when the encoding method is relay encoding, the communication module is also used to send the output signal amplitude information to the dual CPU module, and output the device status.

[0022] Furthermore, the dual-CPU module is also used to determine whether to obtain carrier frequency and low-frequency encoding information from the relay circuit or the communication module based on the encoding method. When using carrier frequency and low-frequency encoding information obtained from the relay circuit, if the carrier frequency information or the low-frequency information is incorrect, the transmitter stops outputting. When using carrier frequency and low-frequency encoding information obtained from the communication module, if the carrier frequency or the low-frequency information is incorrect, the main unit stops outputting, and the backup unit outputs according to the carrier frequency information obtained from the relay circuit and the default low-frequency information. If the carrier frequency information obtained from the relay circuit is also incorrect, then outputting stops.

[0023] Furthermore, the dynamic input reading module includes a varistor, a first resistor, a reading optocoupler, a control optocoupler, a second resistor, and a third resistor. The reading optocoupler includes a first diode and a first phototransistor, and the control optocoupler includes a second diode and a second phototransistor.

[0024] In this configuration, the two ends of the varistor are connected to the power supply for encoding conditions; the first end of the varistor is connected to the first end of the first resistor; the second end of the first resistor is connected to the anode of the first diode; the cathode of the first diode is connected to the collector of the second phototransistor; the emitter of the second phototransistor is connected to the second end of the varistor; the emitter of the first phototransistor is grounded; the collector of the first phototransistor is the read point; and the collector of the first phototransistor is also connected to the first end of the second resistor. The anode of the second diode is connected to the first end of the third resistor; and the cathode of the second diode is the control point.

[0025] Furthermore, the security isolation module includes a first high-frequency isolation optocoupler and a second high-frequency isolation optocoupler;

[0026] The input terminal of the first high-frequency isolation optocoupler is connected to a digital power supply, the output terminal of the second high-frequency isolation optocoupler is connected to an analog power supply, and the control power supply is connected to the output terminal of the first high-frequency isolation optocoupler and the input terminal of the second high-frequency isolation optocoupler, respectively.

[0027] Furthermore, the dual-CPU module includes a first CPU, an FPGA, and a second CPU. The FPGA is communicatively connected to the first CPU and the second CPU, and the first CPU is communicatively connected to the second CPU. The signal generation and feedback module includes a first crystal oscillator, a second crystal oscillator, and a control AND gate.

[0028] The first CPU is used to convert the acquired module relay code carrier frequency information, low frequency code information and output signal amplitude information into digital signals and send them to the FPGA.

[0029] The FPGA is used to generate digital frequency-shift signals with corresponding frequency and amplitude through the first crystal oscillator, and also returns the period of the digital frequency-shift signals to the first CPU and the second CPU respectively through the first signal period detection module and the second signal period detection module controlled by the second crystal oscillator.

[0030] The first CPU and the second CPU are used to control the digital frequency shift signal output of the door handle if the detected signal period frequency meets the requirements.

[0031] Furthermore, the dual-CPU module is also used to output the amplitude of the power signal within a set range based on the output signal amplitude information obtained from the communication module.

[0032] Furthermore, the dual-CPU module is also used to perform a back check on the status of the switching relay module.

[0033] Furthermore, the first CPU and the second CPU are used to periodically interact with the carrier frequency information, low-frequency encoding information, output signal amplitude information, and back-checked data.

[0034] The present invention also provides a method for generating a frequency-shift signal, comprising the following steps:

[0035] Based on the acquired input signal, a digital frequency shift signal is generated;

[0036] The carrier frequency period of the digital frequency shift signal is checked back. If the detection result meets the requirements, a digital control command is output.

[0037] The voltage amplitude and frequency of the power output signal are checked. If the test results meet the requirements, the power output signal is output. The power output signal generation process includes: processing digital control commands to obtain an AC signal, and amplifying the AC signal to generate the power output signal.

[0038] By checking the voltage amplitude and current of the output signal, the amplitude of the generated digital frequency shift signal is adjusted in real time.

[0039] The beneficial effects of this invention are:

[0040] 1. The power output signal amplitude of the frequency shift signal transmitter of the present invention is configured through communication, which reduces the engineering wiring for configuring the power output signal amplitude, simplifies the equipment interface, and reduces the number of fault points and maintenance workload.

[0041] 2. The output signal amplitude of the frequency shift signal transmitter of the present invention can be configured remotely via communication, and the output voltage of each transmitter can be pre-configured by software, reducing the probability of engineers misconfiguring the transmitter voltage during construction.

[0042] 3. The frequency shift signal transmitter of the present invention can finely adjust the amplitude of the output signal through output voltage feedback, which overcomes the problem of large fluctuations in the output voltage signal under different load conditions of existing transmitters and improves the safety of the system.

[0043] Other features and advantages of the invention will be set forth in the following description, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention may be realized and obtained by means of the structures pointed out in the description and the drawings. Attached Figure Description

[0044] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0045] Figure 1 A schematic diagram of a frequency shift signal transmitter according to an embodiment of the present invention is shown;

[0046] Figure 2 A schematic diagram of the structure of a dynamic input reading module according to an embodiment of the present invention is shown;

[0047] Figure 3 A schematic diagram of the signal generation and frequency re-detection module according to an embodiment of the present invention is shown;

[0048] Figure 4 A first structural schematic diagram of a security isolation module according to an embodiment of the present invention is shown;

[0049] Figure 5 A second structural schematic diagram of a security isolation module according to an embodiment of the present invention is shown;

[0050] Figure 6 A third structural schematic diagram of a security isolation module according to an embodiment of the present invention is shown;

[0051] Figure 7 A fourth structural schematic diagram of a security isolation module according to an embodiment of the present invention is shown;

[0052] Figure 8 A schematic flowchart of a frequency shift signal generation method according to an embodiment of the present invention is shown. Detailed Implementation

[0053] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0054] It should be noted that the terms "first," "second," etc., used in this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0055] With the increasing digitalization and intelligence of transportation and the growing demand for maintenance when equipment malfunctions, track circuits are also facing issues such as remote adjustment and lack of maintenance. There is a need to be able to remotely adjust track circuits when electronic or transmission equipment malfunctions, so as to quickly resolve on-site problems.

[0056] This invention provides a frequency-shifting signal transmitter and generation method that automatically adjusts the signal output amplitude. Based on input information such as carrier frequency, low frequency, and amplitude obtained through communication, the transmitter can automatically adjust the frequency and amplitude of the generated signal, solving problems such as remote and digital configuration of track circuits. This reduces construction and maintenance difficulties and achieves optimal configuration of track circuits.

[0057] like Figure 1 As shown, a frequency shift signal transmitter includes an encoding method and address setting module, a dynamic input reading module, a communication module, a dual CPU module, a signal generation and frequency feedback module, a security isolation module, a digital-to-analog conversion module, a signal amplification and feedback module, a first security AND gate module, a second security AND gate module, and a switching relay module.

[0058] The dual-CPU module includes a first CPU, an FPGA, and a second CPU. The encoding method and address setting module is connected to the first CPU and the second CPU. The FPGA is connected to the first CPU and the second CPU. The first CPU is connected to the second CPU. The encoding method and address setting module is used to input the address encoding and encoding method into the dual-CPU module through static configuration and to verify them through CRC or positive / negative code.

[0059] The dynamic input reading module is used to read the input relay condition signal. The dynamic input reading module is connected to the first CPU and the second CPU. The dynamic input reading module is used to send the carrier frequency information and low frequency encoding information obtained from the relay circuit to the dual CPU module.

[0060] For example, to ensure accurate signal reading, the dynamic input reading module uses a dynamic reading method. The input relay conditions include one set of carrier frequency (8 channels) and one set of low-frequency conditions (18 channels). The 8 carrier frequency inputs represent 8 different carrier frequencies of the signal, and only one channel can be input with a +24V condition. The 18 low-frequency inputs represent 18 different carrier frequencies of the signal, and only one channel can be input with a +24V condition. The direction input condition can only be input with a +24V condition, indicating whether the input is forward or reverse. The low-frequency input and direction output are used when the encoding method is relay encoding.

[0061] Considering the "fail-safe" principle, such as Figure 2 As shown, the dynamic input reading module includes a varistor, a first resistor, a reading optocoupler, a control optocoupler, a second resistor, and a third resistor. The reading optocoupler includes a first diode and a first phototransistor, and the control optocoupler includes a second diode and a second phototransistor.

[0062] The two ends of the varistor are connected to a 24V encoding condition power supply. The first end of the varistor is connected to the first end of the first resistor. The second end of the first resistor is connected to the anode of the first diode. The cathode of the first diode is connected to the collector of the second phototransistor. The emitter of the second phototransistor is connected to the second end of the varistor. The emitter of the first phototransistor is grounded. The collector of the first phototransistor is the read point A. The collector of the first phototransistor is also connected to the first end of the second resistor. The voltage between the second end of the second resistor and the read point A is 3.3V. The anode of the second diode is connected to the first end of the third resistor. The voltage between the second end of the third resistor and the anode of the second diode is 3.3V. The cathode of the second diode is the control point B.

[0063] The FPGA outputs a square wave signal to control point B. When the +24V encoding condition power supply is present, a square wave signal with the same phase as control point B can be obtained from the reading point A of the reading optocoupler and output to the FPGA to realize the reading of the encoding condition.

[0064] By controlling the settings of the optocoupler and the read optocoupler, dynamic fault detection of circuit components is achieved. When the circuit is normal: when the encoding condition is "1", read point A should acquire a signal that alternates between "0" and "1"; when the encoding condition is "0", read point A should acquire a signal that is continuously "1". When a short circuit / open circuit fault occurs in the read optocoupler, regardless of the encoding condition, read point A will acquire a continuous signal of "1" and "0". When the signal is continuously "0", the software can detect the anomaly and take appropriate action.

[0065] The communication module is connected to both the first CPU and the second CPU. As a communication interface, the communication module is used to isolate and drive signals. When the encoding method is communication encoding, the communication module is also used to send configuration information such as carrier frequency information, low frequency encoding information and output signal amplitude information obtained from the communication bus to the dual CPU module, and output the device status. When the encoding method is relay encoding, the communication module is also used to send the output signal amplitude information to the dual CPU module, and output the device status.

[0066] The dual-CPU module is used to control the signal generation and frequency feedback module to generate a digital frequency-shifted signal based on the acquired input signal. The input signal includes address encoding, carrier frequency information, low-frequency encoding information, and output signal amplitude information.

[0067] The signal generation and frequency feedback module is also used to return the carrier frequency period of the digital frequency shift signal to the dual-CPU module.

[0068] The dual-CPU module is also used to check the carrier frequency period of the digital frequency shift signal. If the detection result meets the requirements, it outputs a digital control command to the digital-to-analog converter module and simultaneously outputs a dynamic signal to the first safety AND gate module. The first safety AND gate module is used to provide control power to the safety isolation module according to the dynamic signal.

[0069] The dual-CPU module is also used to determine whether to obtain carrier frequency and low-frequency encoding information from the relay circuit or the communication module based on the encoding method. When using carrier frequency and low-frequency encoding information obtained from the relay circuit, if the carrier frequency information or the low-frequency information is incorrect, the transmitter stops outputting. When using carrier frequency and low-frequency encoding information obtained from the communication module, if the carrier frequency or the low-frequency information is incorrect, the main unit stops outputting, and the backup unit outputs according to the carrier frequency information obtained from the relay circuit and the default low-frequency information. If the carrier frequency information obtained from the relay circuit is also incorrect, then outputting stops.

[0070] The dual-CPU module is also used to output the power output signal within a set range based on the output signal amplitude information obtained from the communication module, thus simplifying the existing manual adjustment of the power output voltage.

[0071] The digital-to-analog converter module is used to convert digital control commands into AC signals and send them to the signal amplification and feedback module.

[0072] The signal amplification and feedback module is also used to amplify the AC signal to generate a power output signal and feed the power output signal back to the dual-CPU module.

[0073] The frequency shift signal transmitter in this embodiment of the invention uses two independent CPU modules. When the signal is generated, one CPU module controls the generation of a digital frequency shift signal, and the two CPUs simultaneously check the signal frequency and amplitude. The dual CPUs output square waves to drive the first safety AND gate module and the second safety AND gate module.

[0074] For example, the signal generation and feedback module is implemented by an FPGA, such as... Figure 3 As shown, the signal generation and feedback module includes a first crystal oscillator, a second crystal oscillator, and a control AND gate. The first CPU converts the acquired carrier frequency information, low-frequency encoding information, and output signal amplitude information into digital signals and sends them to the FPGA. The FPGA generates a digital frequency-shifted signal with the corresponding frequency and amplitude through the first crystal oscillator. The FPGA also returns the period of the digital frequency-shifted signal to the first CPU and the second CPU respectively through the first signal period detection module and the second signal period detection module controlled by the second crystal oscillator. If the first CPU and the second CPU detect that the signal period frequency meets the requirements, the first CPU and the second CPU output the digital frequency-shifted signal through the control AND gate.

[0075] The signal generation and feedback module of this invention uses two crystal oscillators: one for generating a frequency-shifted signal and the other for checking the signal frequency to ensure that signal frequency errors can be detected in a timely manner.

[0076] The safety isolation module is used to transmit the control commands of the digital frequency shift signal to the digital-to-analog converter module. The digital-to-analog converter module is used to convert the control commands of the digital frequency shift signal into an analog signal and perform low-frequency filtering to remove the high-frequency components of the analog signal, so that it becomes a sinusoidal AC signal and is then sent to the signal amplification and feedback module.

[0077] For example, such as Figure 4 As shown, the safety isolation module includes a first high-frequency isolation optocoupler and a second high-frequency isolation optocoupler. The input terminal of the first high-frequency isolation optocoupler is connected to a digital power supply, and the output terminal of the second high-frequency isolation optocoupler is connected to an analog power supply. The control power supply is connected to the output terminal of the first high-frequency isolation optocoupler and the input terminal of the second high-frequency isolation optocoupler, respectively. If there is no control power supply, the control command will not be able to pass through the first high-frequency isolation optocoupler and the second high-frequency isolation optocoupler of the safety isolation module, the digital-to-analog conversion module will not be able to receive the real-time control command, and will not be able to generate the corresponding frequency-shifted analog signal.

[0078] For example, a safety isolation module can also be controlled by an AC isolation chip, thereby enabling control of the AC signal channel.

[0079] For example, such as Figure 5 As shown, the safety isolation module uses a first isolation amplifier. The input of the first isolation amplifier is connected to a digital power supply, and the output of the first isolation amplifier is connected to a control power supply. When the control power supply is applied, the AC signal is output through the first isolation amplifier.

[0080] For example, such as Figure 6 As shown, the safety isolation module uses a second isolation amplifier. The input of the second isolation amplifier is connected to the control power supply, and the output of the second isolation amplifier is connected to an analog power supply. When the control power supply is connected, the AC signal is output through the second isolation amplifier.

[0081] For example, such as Figure 7 As shown, the safety isolation module uses a second isolation amplifier. Both the input and output terminals of the second isolation amplifier are connected to the control power supply. When the control power supply is applied, the AC signal is output through the second isolation amplifier.

[0082] For example, the digital-to-analog converter module can be replaced with a digitally adjustable resistor voltage divider. This eliminates the need for an analog-to-digital converter circuit. The signal generation method becomes a CPU controlling an FPGA to generate a frequency-shifted square wave signal. The power supply controls the secondary power supply of the first high-speed optocoupler and the primary power supply of the second optocoupler, controlling whether the square wave signal is output to the subsequent stage. The frequency-shifted square wave signal after isolation optocoupler is converted into a sinusoidal AC signal through a DC blocking circuit and a low-pass filter. The input signal of the power amplifier circuit is changed by a digitally adjustable voltage divider and a fixed resistor (or a fixed resistor divider and a digitally adjustable resistor divider), thereby changing the signal amplitude.

[0083] In this embodiment of the invention, the digital frequency shift signal can be safely cut off from the power output signal through the safety isolation module, ensuring that the transmitter cannot output a power output signal with an incorrect frequency or amplitude under any single fault condition.

[0084] The signal amplification and feedback module is used to amplify the sinusoidal AC signal into an output signal and output it to the switching relay module, and feed the output signal back to the dual CPU module for checking the voltage amplitude and current.

[0085] For example, the signal amplification and feedback module uses a digital power amplifier. The amplitude of the output signal is adjusted by changing the duty cycle of the SPWM signal control signal of the digital power amplifier. The duty cycle of the SPWM signal control signal is adjusted by changing the feedback amplitude of the output signal.

[0086] The dual-CPU module is also used to check the voltage amplitude and frequency of the power output signal. If the detection results meet the requirements, it controls the switching relay module to output the power output signal, as follows:

[0087] The dual-CPU module checks the voltage amplitude and frequency of the power output signal. If the frequency and amplitude of the power output signal meet the requirements, the dual-CPU module outputs a dynamic signal to the second safety AND gate module.

[0088] The second safety AND gate module is used to control the switching relay module to output the power signal based on the output dynamic signal.

[0089] The switching relay module is used to switch the output channels of the main and backup transmitting devices according to the signal switching command.

[0090] like Figure 1 As shown, the dual-CPU module is also used to perform a back check on the status of the switching relay module.

[0091] The first and second safety AND gate modules are both communicatively connected to the first and second CPUs. The first safety AND gate module is also communicatively connected to the safety isolation module, and the second safety AND gate module is also communicatively connected to the external switching relay module. The first and second safety AND gate modules convert the dynamic square waves output by the first and second CPUs into isolated +24V DC signals. The first safety AND gate module is used to provide control power to the safety isolation module, and the second safety AND gate module is used to control the switching relay module to switch the output channels of the main and backup transmitting devices.

[0092] For example, to prevent significant variations in the output voltage of the frequency-shift signal transmitter under different load conditions, the dual-CPU module also performs feedback on the voltage amplitude and current of the output signal from the signal amplification and feedback module. This allows for real-time adjustment of the amplitude of the digital frequency-shift signal generated by the signal generation and frequency feedback modules, achieving fine-tuning of the output signal voltage amplitude. This ensures the transmitter's output signal amplitude can vary within a small range and within the desired range under different load conditions, preventing unwanted voltage increases and ensuring system fault-tolerant safety. Furthermore, by feedback on the output signal current, the dual-CPU module can promptly adjust the transmitter's output signal voltage amplitude, preventing excessive output voltage and equipment damage.

[0093] The above achieves automatic output adjustment when voltage rises due to transmission, keeping the output voltage within the specified range.

[0094] For example, the first CPU and the second CPU periodically interact with the module's relay code carrier frequency information, low frequency code information, output signal amplitude information, and feedback data to ensure the consistency of the dual CPU module data. If the key interaction data between the two CPUs is consistent, the device continues to work; otherwise, the device crashes and stops driving the square wave signal and power output signal of the first safety AND gate module and the second safety AND gate module.

[0095] Based on the above frequency shift signal transmitter, such as Figure 8 As shown, this embodiment of the invention also provides a frequency shift signal generation method, including the following steps: generating a digital frequency shift signal based on the acquired input signal; performing a back check on the carrier frequency period of the digital frequency shift signal, and outputting a digital control command if the detection result meets the requirements; checking the voltage amplitude and frequency of the power output signal, and outputting the power output signal if the detection result meets the requirements. Generating the power output signal includes: processing the digital control command to obtain an AC signal, and amplifying the AC signal to generate the power output signal.

[0096] The specific steps of a frequency shift signal generation method are as follows:

[0097] S1. The dual-CPU module obtains the address code through the encoding method and address setting module. The dual-CPU module obtains the relay code carrier frequency information and low-frequency code information through the input dynamic acquisition module, or obtains the carrier frequency information and low-frequency code information through the communication module. At the same time, it obtains the relay code carrier frequency information through the input dynamic acquisition module (used in case of communication failure). The dual-CPU module obtains the output signal amplitude information from the communication module.

[0098] S2. The dual CPU module stops outputting the dynamic square wave of the second safety AND gate module, checks the external switching relay module, and ensures that the switching relay module drops successfully to prevent incorrect power output signal output.

[0099] S3. The first CPU controls the signal generation and frequency feedback module to generate a digital frequency shift signal of the corresponding amplitude based on the input signals (address code, carrier frequency information, low frequency code information and output signal amplitude information).

[0100] S4. The signal generation and frequency feedback module returns the carrier frequency period of the digital frequency shift signal to the dual CPU module for inspection. If both CPU modules detect that the frequency of the digital frequency shift signal meets the requirements, the dual CPU modules simultaneously output digital control commands through the control AND gate to the digital-to-analog converter module via the safety isolation module, and simultaneously output dynamic signals to drive the first safety AND gate module to provide control power to the safety isolation module.

[0101] S5, the digital-to-analog conversion module converts digital control commands into analog signals and performs low-frequency filtering to remove high-frequency components of the analog signals, obtaining sinusoidal AC signals and sending them to the signal amplification and feedback module.

[0102] S6, the signal amplification and feedback module amplifies the sinusoidal AC signal to generate a power output signal, and feeds the power output signal back to the dual CPU module for voltage amplitude and frequency checks. If both CPU modules detect that the frequency and amplitude of the power output signal meet the requirements, the dual CPU module outputs a dynamic signal to the second safety AND gate module, and the second safety AND gate module controls the switching relay module to output the power output signal.

[0103] S7, the dual-CPU module adjusts the amplitude of the digital frequency shift signal generated by the signal generation and frequency feedback module in real time by checking the voltage amplitude and current of the power output signal.

[0104] S8, the dual-CPU module performs a back-check on the status of the switching relay module.

[0105] S9, the dual-CPU module periodically interacts with the module's relay code carrier frequency information, low-frequency code information, output signal amplitude information, and feedback data.

[0106] In this embodiment of the invention, the power output signal amplitude of the transmitter is configured via communication, which reduces the engineering wiring for configuring the power output signal amplitude, simplifies the device interface, and reduces the number of fault points and maintenance workload.

[0107] In this embodiment of the invention, the power output signal amplitude of the transmitter is configured remotely via communication, and the output voltage of each transmitter can be pre-configured by software, reducing the probability of engineers misconfiguring the transmitter voltage during construction.

[0108] In this embodiment of the invention, the transmitter can finely adjust the amplitude of the output signal by output voltage feedback, overcoming the problem of large fluctuations in the output voltage signal under different load conditions in existing transmitters, and improving the safety of the system.

[0109] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A frequency-shifting signal transmitter, characterized in that, It includes a dual-CPU module, a signal generation and frequency feedback module, and a signal amplification and feedback module; among which, The dual-CPU module is used to control the signal generation and frequency feedback module to generate a digital frequency shift signal based on the acquired input signal. The signal generation and frequency feedback module is also used to return the carrier frequency period of the digital frequency shift signal to the dual CPU module. The dual-CPU module is also used to check the carrier frequency period of the digital frequency shift signal. If the detection result meets the requirements, it outputs a digital control command. The signal amplification and feedback module is used to amplify the acquired AC signal to generate a power output signal and feed the power output signal back to the dual-CPU module; wherein, the AC signal is obtained by performing digital-to-analog conversion processing on the digital control command; The dual-CPU module is also used to check the voltage amplitude and frequency of the power output signal. If the detection result meets the requirements, it controls the switching relay module to output the power output signal. The dual-CPU module is also used to check the voltage amplitude and current of the output signal from the signal amplification and feedback module, and to adjust the amplitude of the digital frequency shift signal generated by the signal generation and frequency feedback module in real time. It also includes an encoding method and address setting module, a dynamic input reading module, and a communication module; among which, the input signal includes address encoding, carrier frequency information, low-frequency encoding information, and output signal amplitude information; The encoding method and address setting module is used to input the address encoding and encoding method into the dual-CPU module; The dynamic input reading module is used to send the carrier frequency information and low-frequency encoding information obtained from the relay circuit to the dual-CPU module; When the encoding method is communication encoding, the communication module is used to send the acquired carrier frequency information, low frequency encoding information and output signal amplitude information to the dual CPU module, and output the device status; when the encoding method is relay encoding, the communication module is also used to send the output signal amplitude information to the dual CPU module, and output the device status.

2. The frequency shift signal transmitter according to claim 1, characterized in that, It also includes a first secure AND gate module and a secure isolation module, wherein the dual CPU module is further configured to output a dynamic signal to the first secure AND gate module when the carrier frequency cycle back check result of the digital frequency shift signal meets the requirements; The first safety AND gate module is used to provide control power to the safety isolation module based on dynamic signals.

3. The frequency shift signal transmitter according to claim 1, characterized in that, Also includes: The digital-to-analog converter module is used to convert control commands from digital signals into AC signals and send them to the signal amplification and feedback module.

4. The frequency shift signal transmitter according to claim 1, characterized in that, It also includes a second safety AND gate module, wherein the dual CPU module is further used to output a dynamic signal to the second safety AND gate module when the voltage amplitude and frequency detection results of the power output signal meet the requirements; The second safety AND gate module is used to control the switching relay module to output the power signal based on the output dynamic signal.

5. The frequency shift signal transmitter according to claim 1, characterized in that, The dual-CPU module is also used to determine whether to obtain carrier frequency and low-frequency encoding information from the relay circuit or the communication module based on the encoding method. When using carrier frequency and low-frequency encoding information obtained from the relay circuit, if the carrier frequency information or the low-frequency information is incorrect, the transmitter stops outputting. When using carrier frequency and low-frequency encoding information obtained from the communication module, if the carrier frequency or the low-frequency information is incorrect, the main unit stops outputting, and the backup unit outputs according to the carrier frequency information obtained from the relay circuit and the default low-frequency information. If the carrier frequency information obtained from the relay circuit is also incorrect, then outputting stops.

6. The frequency shift signal transmitter according to claim 1, characterized in that, The dynamic input reading module includes a varistor, a first resistor, a reading optocoupler, a control optocoupler, a second resistor, and a third resistor. The reading optocoupler includes a first diode and a first phototransistor, and the control optocoupler includes a second diode and a second phototransistor. In this configuration, the two ends of the varistor are connected to the power supply for encoding conditions; the first end of the varistor is connected to the first end of the first resistor; the second end of the first resistor is connected to the anode of the first diode; the cathode of the first diode is connected to the collector of the second phototransistor; the emitter of the second phototransistor is connected to the second end of the varistor; the emitter of the first phototransistor is grounded; the collector of the first phototransistor is the read point; and the collector of the first phototransistor is also connected to the first end of the second resistor. The anode of the second diode is connected to the first end of the third resistor; and the cathode of the second diode is the control point.

7. The frequency shift signal transmitter according to claim 2, characterized in that, The security isolation module includes a first high-frequency isolation optocoupler and a second high-frequency isolation optocoupler. The input terminal of the first high-frequency isolation optocoupler is connected to a digital power supply, the output terminal of the second high-frequency isolation optocoupler is connected to an analog power supply, and the control power supply is connected to the output terminal of the first high-frequency isolation optocoupler and the input terminal of the second high-frequency isolation optocoupler, respectively.

8. The frequency shift signal transmitter according to claim 1, characterized in that, The dual-CPU module includes a first CPU, an FPGA, and a second CPU. The FPGA is communicatively connected to the first CPU and the second CPU, and the first CPU is communicatively connected to the second CPU. The signal generation and feedback module includes a first crystal oscillator, a second crystal oscillator, and a control AND gate. The first CPU is used to convert the acquired module relay code carrier frequency information, low frequency code information and output signal amplitude information into digital signals and send them to the FPGA. The FPGA is used to generate digital frequency-shift signals with corresponding frequency and amplitude through the first crystal oscillator, and also returns the period of the digital frequency-shift signals to the first CPU and the second CPU respectively through the first signal period detection module and the second signal period detection module controlled by the second crystal oscillator. The first CPU and the second CPU are used to control the digital frequency shift signal output of the door handle if the detected signal period frequency meets the requirements.

9. The frequency shift signal transmitter according to claim 1, characterized in that, The dual-CPU module is also used to output the power signal amplitude within a set range based on the output signal amplitude information obtained from the communication module.

10. The frequency shift signal transmitter according to claim 1, characterized in that, The dual-CPU module is also used to perform a back check on the status of the switching relay module.

11. The frequency shift signal transmitter according to claim 8, characterized in that, The first CPU and the second CPU are used to periodically interact with carrier frequency information, low-frequency encoding information, output signal amplitude information, and back-checked data.

12. A method for generating a frequency-shift signal, characterized in that, For a frequency shift signal transmitter according to any one of claims 1-11, the following steps are included: Based on the acquired input signal, a digital frequency shift signal is generated; The carrier frequency period of the digital frequency shift signal is checked back. If the detection result meets the requirements, a digital control command is output. The voltage amplitude and frequency of the power output signal are checked. If the test results meet the requirements, the power output signal is output. The power output signal generation process includes: processing digital control commands to obtain an AC signal, and amplifying the AC signal to generate the power output signal. By checking the voltage amplitude and current of the output signal, the amplitude of the generated digital frequency shift signal is adjusted in real time.

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