Signal processing-based circuit cumulative duration monitoring system

Abstract

The application relates to the field of digital signal processing and discloses a signal processing-based circuit cumulative duration monitoring system, which comprises a signal sampling module, a digital filtering module, a real-time loss evaluation module and a logic accumulation module; the signal sampling module is used for sampling a DC power supply rail of a controlled circuit load branch at a frequency not lower than 1 kHz and obtaining an original digital sequence; the digital filtering module is used for extracting a dynamic characteristic signal between 50 Hz and 500 Hz by using a digital band-pass filter; the real-time loss evaluation module is used for calculating a real-time loss factor representing a physical attenuation rate through signal transformation; and the logic accumulation module is used for pre-set unit step nonlinear compensation and discrete accumulation according to the real-time loss factor to generate a circuit cumulative duration; the application realizes accurate conversion of an effective loss state by analyzing an electric signal evolution process, uses a loss factor to nonlinearly correct an accumulation step, solves the problem that linear timing logic cannot identify the contribution of microscopic electric signal stress to physical performance, and guarantees safe operation of the system.

Description

Technical Field

[0001] This invention belongs to the field of digital signal processing technology, and in particular relates to a circuit cumulative duration monitoring system based on signal processing. Background Technology

[0002] Industrial control terminals and security monitoring equipment are usually set with a preset service life. In civilian security fields such as gas leak alarms, the industry generally uses physical timing circuits or logic based on pulse counting to accumulate the power-on time. This approach is based on the assumption that the aging rate of electronic devices is linearly positively correlated with the natural elapsed time. The expiration reminder is triggered by recording the accumulated power-on pulses in the memory and setting a fixed duration threshold.

[0003] However, in kitchen and bathroom environments or industrial power supply conditions, power grid fluctuations causing power ripple and load switching causing current disturbances can generate non-uniform physical stress on internal energy storage components and core sensing units. This stress, under typical harsh electromagnetic environments, can accelerate wear and tear, causing a significant deviation between the device's physical lifespan and its natural timing cycle. Existing static timing schemes only record macroscopic time elapsed and cannot analyze the microscopic signal characteristics of the power rail to perceive the true stress state within the circuit. This can easily lead to premature device failure under harsh signal conditions without triggering warnings. To address these challenges, the industry has attempted to improve timing accuracy by adding external environmental sensors or using high-precision crystal oscillators. However, this not only increases system complexity and cost due to the introduction of additional physical hardware but also fails to fundamentally resolve the mapping discrepancy between natural time and effective wear duration. Furthermore, it may introduce new system failure risks due to the reliability issues of the added components.

[0004] Therefore, the technical problem to be solved by this invention is to utilize the existing electrical signal characteristics in the system to construct a dynamic correlation model between the internal load stress of the circuit and the effective life loss through digital signal processing, so as to achieve accurate quantification of the equivalent loss time of the equipment. Summary of the Invention

[0005] This invention proposes a circuit cumulative duration monitoring system based on signal processing, comprising: The signal sampling module is used to sample the DC power rail at a frequency of not less than 1kHz at the input terminal of the load branch of the controlled circuit to obtain the original digital sequence characterizing the power supply level fluctuation. The digital filtering module, connected to the signal sampling module, is used to decouple the dynamic characteristic signal with a frequency between 50Hz and 500Hz from the original digital sequence using a digital bandpass filter, so as to remove the DC fundamental component in the DC power rail and extract the load disturbance characteristics. The real-time loss assessment module, connected to the digital filtering module, is used to periodically transform the dynamic characteristic signal, calculate the total harmonic distortion and effective voltage value of the dynamic characteristic signal, and determine the real-time loss factor characterizing the physical attenuation rate of the controlled circuit based on the offset of the total harmonic distortion and effective voltage value relative to the reference value. The logic accumulation module, connected to the real-time loss assessment module, is used to obtain the preset unit step size for timing and to perform nonlinear compensation on the preset unit step size according to the real-time loss factor. By discretely accumulating the compensated preset unit step size, the cumulative circuit duration reflecting the effective loss state of the controlled circuit under the current signal environment is generated.

[0006] Preferably, the signal sampling module includes a high-frequency sampling circuit, which is located between the DC-DC converter output terminal of the controlled circuit and the load branch. The signal sampling module continuously monitors the DC power rail through its analog-to-digital conversion interface and acquires discrete voltage amplitude points corresponding to the operating frequency of the controlled load based on a preset sampling window, so as to capture the electromagnetic interference characteristics caused by the periodic current pulses generated by the controlled load and combine the discrete voltage amplitude points into an original digital sequence.

[0007] Preferably, the digital filtering module uses a finite impulse response filter, and the cutoff frequency of the digital bandpass filter is set according to the characteristic frequency of the functional unit in the controlled circuit, so that the extracted dynamic characteristic signal covers the charging and discharging ripple of the energy storage element inside the controlled circuit.

[0008] Preferably, when the real-time loss assessment module calculates the total harmonic distortion and the effective voltage value, it includes the following refinement processes: performing frequency domain analysis on the dynamic characteristic signal through fast Fourier transform; determining the total harmonic distortion by calculating the ratio of the sum of the energy of each harmonic component to the fundamental energy; and determining the effective voltage value based on the root mean square of the sum of the squares of the instantaneous voltages at the sampling points.

[0009] Preferably, when the real-time loss assessment module calculates the real-time loss factor, it presets weighting coefficients to characterize the weights of different environmental stresses. The weighting coefficients include a first weighting coefficient corresponding to the total harmonic distortion and a second weighting coefficient corresponding to the effective voltage value.

[0010] Preferably, the logic accumulation module has a nonlinear mapping table built inside. The logic accumulation module uses the calculated real-time loss factor as a query index to obtain the corresponding step size correction coefficient from the nonlinear mapping table, and determines the product of the preset unit step size and the step size correction coefficient as the corrected preset unit step size.

[0011] Preferably, it also includes: a state discrimination module, connected to the logic accumulation module, used to compare the cumulative duration of the circuit with a preset lifespan threshold, and generate an early warning command indicating that the lifespan of the controlled circuit has expired when the cumulative duration of the circuit reaches the lifespan threshold.

[0012] Preferably, it further includes: a non-volatile storage module connected to the logic accumulation module, used to store the current cumulative circuit duration in real time when the controlled circuit is powered off, and to use the stored value as the initial value for discrete accumulation after the controlled circuit is powered on again.

[0013] Preferably, it further includes: an interactive feedback module, connected to the status discrimination module, used to receive warning commands and control the prompting unit to generate an audible and visual tracer signal indicating the end of the lifespan.

[0014] Compared with existing technologies, the circuit cumulative duration monitoring system based on signal processing described in this invention has the following advantages: 1. By setting a high-frequency sampling branch between the regulated output terminal and the timing control unit, and using a digital filter to extract the frequency components containing the dynamic characteristics of the load from the DC power rail, the monitoring process is transformed from measuring the naturally passing physical time to analyzing the evolution of electrical signals inside the circuit. This eliminates the lifespan determination deviation caused by power ripple fluctuations and electromagnetic interference in traditional solutions, and achieves accurate conversion of the effective loss state of the circuit.

[0015] 2. The real-time loss factor constructed by combining total harmonic distortion and effective voltage value enables the system's cumulative step size to be nonlinearly corrected according to the degree of degradation of the current electromagnetic environment. This deep coupling mechanism between signal characteristics and loss rate allows the system to automatically accelerate the judgment cycle under harsh operating conditions, while avoiding excessive maintenance and resource waste in high-quality environments. This solves the problem that linear timing logic cannot identify the nonlinear contribution of microscopic electrical signal stress to physical performance.

[0016] 3. By utilizing continuous spectrum analysis of load characteristic signals, the system can capture signal distortions caused by aging of internal energy storage components or early signs of power module failure during the recording of cumulative duration. This state perception capability driven by signal processing enables the monitoring device, which was originally in a passive counting state, to have preventive maintenance control logic, thereby improving the safety boundary and operational stability of the system throughout its entire life cycle. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the logic processing flow of the present invention; Figure 2 This is a hardware architecture and functional module distribution diagram of the circuit cumulative duration monitoring system based on signal processing according to the present invention. Detailed Implementation

[0018] The technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application are within the scope of protection of this application.

[0019] It should be noted that all directional and positional terms used in this invention, such as "up," "down," "left," "right," "front," "back," "vertical," "horizontal," "inner," "outer," "top," "lower," "lateral," "longitudinal," and "center," are only used to explain the relative positional relationships and connections between components in a specific state (as shown in the accompanying drawings). They are merely for the convenience of describing the invention and do not require the invention to be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on the invention. Furthermore, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated.

[0020] In the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0021] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0022] A circuit cumulative duration monitoring system based on signal processing includes: The signal sampling module is used to sample the DC power rail at a frequency of not less than 1kHz at the input terminal of the load branch of the controlled circuit to obtain the original digital sequence characterizing the power supply level fluctuation. The digital filtering module, connected to the signal sampling module, is used to decouple the dynamic characteristic signal with a frequency between 50Hz and 500Hz from the original digital sequence using a digital bandpass filter, so as to remove the DC fundamental component in the DC power rail and extract the load disturbance characteristics. The real-time loss assessment module, connected to the digital filtering module, is used to periodically transform the dynamic characteristic signal, calculate the total harmonic distortion and effective voltage value of the dynamic characteristic signal, and determine the real-time loss factor characterizing the physical attenuation rate of the controlled circuit based on the offset of the total harmonic distortion and effective voltage value relative to the reference value. The logic accumulation module, connected to the real-time loss assessment module, is used to obtain the preset unit step size for timing and to perform nonlinear compensation on the preset unit step size according to the real-time loss factor. By discretely accumulating the compensated preset unit step size, the cumulative circuit duration reflecting the effective loss state of the controlled circuit under the current signal environment is generated.

[0023] Preferably, the signal sampling module includes a high-frequency sampling circuit, which is located between the DC-DC converter output terminal of the controlled circuit and the load branch. The signal sampling module continuously monitors the DC power rail through its analog-to-digital conversion interface and acquires discrete voltage amplitude points corresponding to the operating frequency of the controlled load based on a preset sampling window, so as to capture the electromagnetic interference characteristics caused by the periodic current pulses generated by the controlled load and combine the discrete voltage amplitude points into an original digital sequence.

[0024] Preferably, the digital filtering module uses a finite impulse response filter, and the cutoff frequency of the digital bandpass filter is set according to the characteristic frequency of the functional unit in the controlled circuit, so that the extracted dynamic characteristic signal covers the charging and discharging ripple of the energy storage element inside the controlled circuit.

[0025] Preferably, when the real-time loss assessment module calculates the total harmonic distortion and the effective voltage value, it includes the following refinement processes: performing frequency domain analysis on the dynamic characteristic signal through fast Fourier transform; determining the total harmonic distortion by calculating the ratio of the sum of the energy of each harmonic component to the fundamental energy; and determining the effective voltage value based on the root mean square of the sum of the squares of the instantaneous voltages at the sampling points.

[0026] Preferably, when the real-time loss assessment module calculates the real-time loss factor, it presets weighting coefficients to characterize the weights of different environmental stresses. The weighting coefficients include a first weighting coefficient corresponding to the total harmonic distortion and a second weighting coefficient corresponding to the effective voltage value.

[0027] Preferably, the logic accumulation module has a nonlinear mapping table built inside. The logic accumulation module uses the calculated real-time loss factor as a query index to obtain the corresponding step size correction coefficient from the nonlinear mapping table, and determines the product of the preset unit step size and the step size correction coefficient as the corrected preset unit step size.

[0028] Preferably, it also includes: a state discrimination module, connected to the logic accumulation module, used to compare the cumulative duration of the circuit with a preset lifespan threshold, and generate an early warning command indicating that the lifespan of the controlled circuit has expired when the cumulative duration of the circuit reaches the lifespan threshold.

[0029] Preferably, it further includes: a non-volatile storage module connected to the logic accumulation module, used to store the current cumulative circuit duration in real time when the controlled circuit is powered off, and to use the stored value as the initial value for discrete accumulation after the controlled circuit is powered on again.

[0030] Preferably, it further includes: an interactive feedback module, connected to the status discrimination module, used to receive warning commands and control the prompting unit to generate an audible and visual tracer signal indicating the end of the lifespan.

[0031] Example 1: This example combines Figures 1 to 2 A description of a circuit cumulative duration monitoring system based on signal processing, such as... Figure 1 As shown, the process uses the DC power rail provided by the load branch of the controlled circuit as the input source. The signal sampling module samples the DC power rail at a frequency of not less than 1kHz to obtain the original digital sequence characterizing the power level fluctuation. The digital filtering module uses a digital bandpass filter to remove the DC fundamental component and extract the load disturbance to output a dynamic characteristic signal with a frequency between 50Hz and 500Hz. The real-time loss assessment module determines the real-time loss factor characterizing physical attenuation by calculating the total harmonic distortion and the effective voltage value. The logic accumulation module performs nonlinear compensation on the step size based on the real-time loss factor and generates the circuit cumulative duration reflecting the effective loss state through discrete accumulation. The state discrimination module is responsible for comparing the circuit cumulative duration with the preset lifetime threshold and generating a warning command when the threshold is reached. After receiving the warning command, the interactive feedback module controls the prompt unit to generate an audible and visual tracer signal characterizing the end of the lifetime. The non-volatile storage module is used to store the current circuit cumulative duration in real time when the power is off and use it as the starting initial value for discrete accumulation after the controlled circuit is powered on again.

[0032] like Figure 2As shown, the industrial control terminal or security monitoring equipment includes a DC power rail, a controlled circuit load branch, and an internal energy storage element. The high-frequency sampling circuit monitors the DC power rail through an analog-to-digital conversion interface and outputs discrete voltage amplitude points to a digital signal processor. The digital signal processor integrates interconnected signal sampling modules, digital filtering modules, real-time loss assessment modules, logic accumulation modules, state discrimination modules, and interactive feedback modules. The signal sampling module converts the discrete voltage amplitude points into a raw digital sequence, the digital filtering module extracts dynamic feature signals, the real-time loss assessment module calculates the real-time loss factor, the logic accumulation module generates the circuit accumulation time based on this and transmits it to a non-volatile storage module for storage, and the state discrimination module generates an early warning command based on the circuit accumulation time, which drives an external prompting unit to generate an audible and visual tracer signal through the interactive feedback module.

[0033] The embodiments of this application have been described above with reference to the accompanying drawings. Unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other. This application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

Claims

1. A circuit cumulative duration monitoring system based on signal processing, characterized in that, include: The signal acquisition unit is used to perform high-frequency sampling of the DC power rail of the controlled circuit load branch to obtain the original voltage digital sequence; The feature extraction unit, connected to the signal acquisition unit, is used to decouple the dynamic feature signal containing load dynamic characteristics from the original voltage digital sequence through digital bandpass filtering, so as to remove the DC fundamental component and extract the load disturbance characteristics. The loss assessment unit, connected to the feature extraction unit, is used to perform signal transformation on the dynamic feature signal, calculate the feature parameters characterizing the aging stress of the circuit, and determine the real-time loss factor characterizing the physical decay rate of the controlled circuit based on the offset of the feature parameters relative to the reference value. The cumulative metering unit, connected to the loss assessment unit, is used to obtain a preset time unit step and perform nonlinear correction on the time unit step according to the real-time loss factor. By discretely accumulating the corrected time step, a circuit cumulative duration reflecting the effective loss state of the controlled circuit is generated.

2. The circuit cumulative duration monitoring system based on signal processing according to claim 1, characterized in that, The signal sampling module includes a high-frequency sampling circuit, which is located between the DC-DC converter output terminal of the controlled circuit and the load branch. The signal sampling module continuously monitors the DC power rail through its analog-to-digital conversion interface and acquires discrete voltage amplitude points corresponding to the operating frequency of the controlled load based on a preset sampling window. This is to capture the electromagnetic interference characteristics caused by the periodic current pulses generated by the controlled load and combine the discrete voltage amplitude points into an original digital sequence.

3. The circuit cumulative duration monitoring system based on signal processing according to claim 1, characterized in that, The digital filtering module uses a finite impulse response filter. The cutoff frequency of the digital bandpass filter is set according to the characteristic frequency of the functional unit in the controlled circuit, so that the extracted dynamic characteristic signal covers the charging and discharging ripple of the energy storage element inside the controlled circuit.

4. The circuit cumulative duration monitoring system based on signal processing according to claim 1, characterized in that, When calculating the total harmonic distortion (THD) and the effective voltage value, the real-time loss assessment module includes the following refinement processes: frequency domain analysis of the dynamic characteristic signal through fast Fourier transform; determination of the THD by calculating the ratio of the sum of the energy of each harmonic component to the fundamental energy; and determination of the effective voltage value based on the root mean square of the sum of the squares of the instantaneous voltages at the sampling points.

5. The circuit cumulative duration monitoring system based on signal processing according to claim 1, characterized in that, When calculating the real-time loss factor, the loss assessment unit uses a weighted fusion algorithm, specifically including: The system uses preset weighting coefficients to characterize different environmental stress weights, wherein the characteristic parameters include total harmonic distortion (THD) and effective voltage (Vrms). The formula for calculating the real-time loss factor (Lreal) is as follows: Lreal=α⋅THD / THDref+β⋅Vrms / Vref Where α is the weighting coefficient for total harmonic distortion, β is the weighting coefficient for the effective voltage value, and THDref and Vref are the corresponding reference values.

6. The circuit cumulative duration monitoring system based on signal processing according to claim 1, characterized in that, The cumulative metering unit has a nonlinear mapping table or function built inside it. The cumulative metering unit takes the calculated real-time loss factor as input and obtains the corresponding step size correction coefficient KK. Wherein, the corrected unit step size ΔTadj is: ΔTadj = ΔTbase × K(Lreal) The cumulative metering unit accumulates ΔTadj to generate the cumulative duration Teff of the circuit.

7. The circuit cumulative duration monitoring system based on signal processing according to claim 1, characterized in that, Also includes: The status discrimination module, connected to the logic accumulation module, is used to compare the cumulative duration of the circuit with the preset lifespan threshold, and generate an early warning command indicating that the lifespan of the controlled circuit has expired when the cumulative duration of the circuit reaches the lifespan threshold.

8. The circuit cumulative duration monitoring system based on signal processing according to claim 1, characterized in that, Also includes: The non-volatile memory module, connected to the logic accumulation module, is used to store the current cumulative duration of the circuit when the controlled circuit is powered off, and to use the stored value as the initial value for discrete accumulation after the controlled circuit is powered on again.

9. The circuit cumulative duration monitoring system based on signal processing according to claim 7, characterized in that, Also includes: The interactive feedback module, connected to the status discrimination module, is used to receive early warning commands and control the prompting unit to generate an audible and visual tracer signal indicating the end of the product's lifespan.

Images