A detection method, device and equipment of a power consumption device and a storage medium

Abstract

This application provides a method, apparatus, device, and storage medium for detecting a current-eliminating device. The method includes: controlling the current-eliminating device to perform a switching action according to a preset change pattern, the switching action of the current-eliminating device causing a fluctuation in the charge on the surface of the photosensitive drum corresponding to the preset change pattern; acquiring a detection signal characterizing the change in charge on the surface of the photosensitive drum, and extracting a target fluctuation component from the detection signal; determining whether the change characteristics of the target fluctuation component match the preset change pattern; if they match, the current-eliminating device is deemed functionally effective; if they do not match, the current-eliminating device is deemed functionally ineffective. This application can identify functional failures under power supply circuit conduction conditions such as lamp aging or installation misalignment, thereby improving the detection accuracy of whether the current-eliminating device is working properly.

Description

Technical Field

[0001] This application relates to the field of image forming technology, and more specifically to a method, apparatus, device, and storage medium for detecting a static discharge device. Background Technology

[0002] In an image forming apparatus, a charging roller applies voltage to the surface of a photosensitive drum, forming a uniform charge layer. This charge layer is subsequently exposed to laser light to form an electrostatic latent image, which is then processed through development and transfer to form the output image. After the image forming process is complete, residual charge may still remain on the surface of the photosensitive drum. If this residual charge is not eliminated and the next image forming cycle begins directly, the residual potential formed by this residual charge will participate in the establishment of the drum surface potential as an initial condition when the charging roller applies a uniform high voltage to the photosensitive drum again. This causes the final surface potential of the photosensitive drum to deviate from the set value, resulting in regional differences in the degree of discharge after subsequent laser exposure. This further leads to abnormal toner adhesion during the development stage, ultimately causing defects such as background gray or uneven image density in the output image. The charge elimination device illuminates the surface of the photosensitive drum with light during the image forming process to eliminate the residual charge on the surface, restoring the surface potential to a uniform state, thereby ensuring the normal operation of the next image forming process.

[0003] In related technologies, the detection of the function of an electric dimming lamp is usually based on the detection of the steady-state amplitude or level signal of the current or voltage in the lamp's own power supply circuit. Specifically, by setting a sampling resistor or current detection element in the power supply circuit of the lamp, the current detection signal, voltage detection signal, or high / low level signal in the circuit is acquired, and the working status of the lamp is determined based on whether the steady-state amplitude of the signal is within a preset normal operating range or whether the level state meets the expected state. When the detected steady-state amplitude of the current or voltage deviates from the normal range or the level state does not meet the expected state, the lamp is determined to be abnormal; when the detected steady-state amplitude of the current or voltage is within the normal range or the level state meets the expected state, the lamp is determined to be working normally.

[0004] However, the above-mentioned detection scheme is essentially based on "presuming the effectiveness of the power elimination function based on the normal steady-state parameters of the electrical circuit". It cannot effectively identify the functional failure situation when the power supply circuit of the power elimination lamp is in the conducting state. That is, it cannot verify whether the action of the power elimination lamp has really changed the surface potential of the photosensitive drum and achieved the expected power elimination effect. For example, the light intensity attenuation caused by the aging of the power elimination lamp beads, or the light failing to shine on the surface of the photosensitive drum due to the misalignment of the installation position, or the absence of light guide pillars / light guide strips, etc., will result in the residual charge on the surface of the photosensitive drum not being fully eliminated under the above circumstances, thus affecting the image formation quality.

[0005] It should be noted that the information disclosed in the background section of this application is intended only to enhance the understanding of the general background of this application, and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Summary of the Invention

[0006] In view of this, this application provides a detection method, apparatus, device and storage medium for a power-dissipating device, in order to solve the problem in the related art that it is impossible to effectively identify functional failures of the power supply circuit of the power-dissipating device when it is in a conducting state.

[0007] In a first aspect, embodiments of this application provide a method for detecting a current-eliminating device, applied to an image forming apparatus, the image forming apparatus including a photosensitive drum and a current-eliminating device, the method comprising: The current-eliminating device is controlled to perform switching actions according to a preset change pattern. The switching action of the current-eliminating device is used to cause the charge on the surface of the photosensitive drum to fluctuate in accordance with the preset change pattern. Acquire a detection signal characterizing the change in surface charge of the photosensitive drum, and extract a target fluctuation component from the detection signal, wherein the target fluctuation component is the signal component caused by the switching action of the power elimination device; Determine whether the variation characteristics of the target fluctuation component match the preset variation pattern; If the change characteristics of the target fluctuation component match the preset change pattern, the current suppression device is deemed to be functional; if the change characteristics of the target fluctuation component do not match the preset change pattern, the current suppression device is deemed to be functional.

[0008] In this embodiment, by controlling the power-extinguishing device to perform switching actions according to a preset variation pattern, charge fluctuations with a known variation pattern can be applied to the surface of the photosensitive drum. When the power-extinguishing device functions normally, the light it emits can effectively eliminate residual charge on the surface of the photosensitive drum, causing the amount of charge on the surface of the photosensitive drum to fluctuate accordingly with the switching action of the power-extinguishing device. The acquired detection signal carries a signal component corresponding to this fluctuation. By extracting this target fluctuation component and determining whether its variation characteristics match the preset variation pattern, it can be confirmed whether the fluctuation is caused by the switching action of the power-extinguishing device. If they match, it indicates that the power-extinguishing device can have a real impact on the charge on the surface of the photosensitive drum, and the power-extinguishing function is effective. If they do not match, it indicates that the power-extinguishing device has failed to have the expected impact on the charge on the surface of the photosensitive drum, and the power-extinguishing function is ineffective. It can be understood that this application can identify functional failures under the power supply circuit conduction state, such as lamp chip aging or installation misalignment, thereby improving the detection accuracy of whether the power-extinguishing device is working properly.

[0009] In one possible implementation, the image forming apparatus further includes a charging roller, the power supply circuit of which is used to provide charge to the surface of the photosensitive drum; the acquisition of a detection signal characterizing the change in charge on the surface of the photosensitive drum includes: Obtain the current detection signal or voltage detection signal in the power supply circuit of the charging roller, and use the current detection signal or the voltage detection signal as the detection signal.

[0010] In this embodiment, the power supply circuit of the charging roller is used to provide charge to the surface of the photosensitive drum. Changes in the charge on the surface of the photosensitive drum will cause changes in the load current of the charging roller. By acquiring the current detection signal or voltage detection signal in the power supply circuit, the detection signal can be acquired using the existing power supply circuit of the image forming apparatus without the need to add additional sensing elements.

[0011] In one possible implementation, the image forming apparatus further includes: an image scanning unit; the acquisition of the detection signal characterizing the change in surface charge of the photosensitive drum includes: The image forming apparatus is controlled to form a detection image on an imaging medium or transfer belt; The imaging signal of the detection image is obtained by the image scanning unit, and the imaging signal is used as the detection signal.

[0012] In this embodiment, when the change in charge on the surface of the photosensitive drum affects the density of toner adhesion on the imaging medium or transfer belt, the change in charge on the surface of the photosensitive drum can be reflected by acquiring the imaging signal of the detected image. This improves the detection accuracy of the de-energizing device without needing to connect to the power supply circuit of the charging roller.

[0013] In one possible implementation, extracting the target fluctuation component from the detected signal includes: The current detection signal or the voltage detection signal is filtered and amplified to extract the AC fluctuation component caused by the switching action of the power elimination device as the target fluctuation component.

[0014] In this embodiment, the current change caused by the switching of the power suppression device is superimposed on the DC base of the charging roller power supply circuit and has a relatively small amplitude. Filtering can separate the DC component from the AC fluctuation component, and amplification can increase the amplitude of the AC fluctuation component, thereby facilitating subsequent data acquisition and analysis.

[0015] In one possible implementation, filtering and amplification of the current detection signal or the voltage detection signal include: The current detection signal or the voltage detection signal is subjected to high-pass filtering to remove the DC bias component and determine the AC fluctuation component. The AC fluctuation component is subjected to low-pass filtering to remove high-frequency interference noise from the AC fluctuation component; The AC fluctuation component after the filtering process is amplified to determine the amplified AC fluctuation component. The amplified AC fluctuation component is collected, and the target fluctuation component is determined based on the amplified AC fluctuation component.

[0016] In this embodiment, the DC bias component and the AC fluctuation component are separated by high-pass filtering, which reduces the interference of the DC component on subsequent processing. The high-frequency noise is suppressed by low-pass filtering, which reduces the clutter components in the signal. The amplitude of the AC fluctuation component is increased by amplification, which facilitates subsequent acquisition and judgment, and improves the overall quality of the detection signal.

[0017] In one possible implementation, the preset change pattern is a preset frequency, and the step of determining whether the change characteristics of the target fluctuation component match the preset change pattern includes: Obtain the fluctuation frequency of the target fluctuation component; Calculate the difference between the fluctuation frequency and the preset frequency or the preset period; If the difference is less than or equal to a preset difference, it is determined that the change characteristics of the target fluctuation component match the preset change pattern; if the difference is greater than the preset difference, it is determined that the change characteristics of the target fluctuation component do not match the preset change pattern.

[0018] In this embodiment of the application, by obtaining the actual fluctuation frequency of the target fluctuation component and calculating the difference between the actual fluctuation frequency and the preset frequency or preset period, it is possible to quantitatively determine whether the two match, so that the determination result has a clear numerical basis and improves the quality of the detection signal.

[0019] Secondly, embodiments of this application provide a detection device for a current-eliminating device, applied to an image forming apparatus, the image forming apparatus including a photosensitive drum and a current-eliminating device, the device comprising: The control unit is used to control the current-eliminating device to perform switching actions according to a preset change pattern. The switching actions of the current-eliminating device are used to cause the charge on the surface of the photosensitive drum to fluctuate in accordance with the preset change pattern. A signal acquisition unit is used to acquire a detection signal characterizing the change in surface charge of the photosensitive drum; A signal processing unit is used to extract a target fluctuation component from the detection signal, wherein the target fluctuation component is a signal component caused by the switching action of the power elimination device; The judgment unit is used to determine whether the change characteristics of the target fluctuation component match the preset change law; The determination unit is used to determine that the current suppression device is functional when the change characteristics of the target fluctuation component match the preset change law; and to determine that the current suppression device is functional when the change characteristics of the target fluctuation component do not match the preset change law.

[0020] In one possible implementation, the image forming apparatus further includes a charging roller, the power supply circuit of which is used to provide charge to the surface of the photosensitive drum; The signal acquisition unit includes a sampling resistor connected in series in the power supply circuit of the charging roller, and the sampling resistor is used to acquire the voltage detection signal in the power supply circuit of the charging roller. The signal processing unit includes: A high-pass filter circuit is connected to the output terminal of the sampling resistor to filter out the DC bias component in the voltage detection signal and obtain the AC fluctuation component. A low-pass filter circuit is connected to the output of the high-pass filter circuit to filter out high-frequency interference noise in the AC fluctuation component. An amplifier circuit, connected to the output of the low-pass filter circuit, is used to amplify the filtered AC ripple component to obtain the amplified AC ripple component. An analog-to-digital converter is connected to the output of the amplifier circuit and is used to acquire the amplified AC fluctuation component and determine the target fluctuation component based on the amplified AC fluctuation component.

[0021] Thirdly, embodiments of this application provide an electronic device, including: processor; Memory; And a computer program, wherein the computer program is stored in the memory, the computer program including instructions that, when executed by the processor, cause the electronic device to perform the method described in any one of the first aspects.

[0022] Fourthly, embodiments of this application provide a computer-readable storage medium including a stored program, wherein, when the program is executed, it controls the device where the computer-readable storage medium is located to perform the method described in any one of the first aspects.

[0023] Understandably, the detection device for the power-dissipating device provided in the second aspect, the electronic device provided in the third aspect, and the computer-readable storage medium provided in the fourth aspect are all used to perform some or all of the methods provided in this application. Therefore, the beneficial effects they can achieve can be referred to the beneficial effects in the corresponding methods, and will not be repeated here. Attached Figure Description

[0024] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of an application scenario provided by an embodiment of this application.

[0026] Figure 2 This is a partial structural schematic diagram of an image forming apparatus provided in an embodiment of this application.

[0027] Figure 3 This is a flowchart illustrating a detection method for an anti-static device provided in an embodiment of this application.

[0028] Figure 4 This is a schematic diagram of the surface charge of a photosensitive drum provided in an embodiment of this application.

[0029] Figure 5A The waveform diagram of a voltage detection signal provided in an embodiment of this application is shown.

[0030] Figure 5B A waveform diagram of an AC wave component provided in an embodiment of this application.

[0031] Figure 5C The waveform diagram provided in this application embodiment is for filtering out the AC fluctuation component of high-frequency interference noise.

[0032] Figure 5D This is a waveform diagram of an amplified AC wave component provided in an embodiment of this application.

[0033] Figure 6 This is a schematic diagram of the structure of a detection device for an anti-static device provided in an embodiment of this application.

[0034] Figure 7 This is a schematic diagram of the circuit structure of a current-eliminating device detection circuit provided in an embodiment of this application.

[0035] Figure 8 This is a schematic diagram of the structure of an electronic device provided in an embodiment of this application. Detailed Implementation

[0036] To better understand the technical solution of this application, the embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0037] It should be understood that the described embodiments are merely some, not all, of the embodiments in this application. All other embodiments obtained by those skilled in the art based on the embodiments in this application without inventive effort are within the scope of protection of this application.

[0038] The terminology used in the embodiments of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of this application. The singular forms “a,” “the,” and “the” used in the embodiments of this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise.

[0039] It should be understood that the term "and / or" used in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0040] See Figure 1 This is a schematic diagram illustrating an application scenario provided by an embodiment of this application. For example... Figure 1 As shown, this application scenario includes an image forming apparatus 101. It should be noted that the image forming apparatus described herein is merely an exemplary description and should not be construed as limiting the scope of protection of this application. For example, an image forming apparatus includes, but is not limited to, printers, copiers, fax machines, scanners, and multifunction printers that integrate printing, copying, faxing, and scanning functions, whose function is to print images or text on an imaging medium.

[0041] In an image forming apparatus, the photosensitive drum is the core component that carries the electrostatic latent image. A charging roller applies voltage to the surface of the photosensitive drum, forming a uniform charge layer. After laser exposure, the charge in the irradiated area is neutralized, forming an electrostatic latent image. Following development, transfer, and fixing processes, the image is finally formed on the imaging medium. After the image forming process is complete, residual charge may still remain on the surface of the photosensitive drum. If this residual charge is not eliminated and the image forming cycle continues, the residual potential formed by this charge will participate as an initial condition in the establishment of the drum surface potential when the charging roller applies a uniform high voltage to the photosensitive drum again. This causes the final surface potential of the photosensitive drum to deviate from the set value, resulting in regional differences in the degree of discharge after subsequent laser exposure. This further leads to abnormal toner adhesion during the development stage, ultimately causing defects such as background gray or uneven image density in the output image. The static elimination device is used to illuminate the surface of the photosensitive drum during the image formation process to eliminate residual charges on the surface of the drum, restoring the surface potential to a uniform state and ensuring the normal operation of the next image formation process. Therefore, the proper functioning of the static elimination device directly affects the image formation quality.

[0042] For ease of understanding, see Figure 2 This is a partial structural schematic diagram of an image forming apparatus provided in an embodiment of this application. Figure 2 As shown, this part of the structure specifically illustrates the charging roller 201, the photosensitive drum 202, and the static elimination device 203. The static elimination device 203 includes a static elimination lamp (not separately labeled in the figure) and a light guide column (not separately labeled in the figure). Combined with... Figure 1 and Figure 2 Inside the image forming apparatus 101, a charging roller 201 is disposed on one circumferential side of the photosensitive drum 202, abutting against the surface of the photosensitive drum 202, and is used to apply voltage to the surface of the photosensitive drum 202 to form a uniform charge layer. A charge elimination device 203 is disposed on the other circumferential side of the photosensitive drum 202, wherein a light guide extends along the axial direction of the photosensitive drum 202, and the light-emitting portion is adjacent to the surface of the photosensitive drum 202. After the image forming process is completed, the light emitted by the charge elimination lamp is conducted through the light guide and irradiates the surface of the photosensitive drum 202, neutralizing and eliminating residual charge on the surface of the photosensitive drum 202. When the charge elimination device 203 is in normal working condition, the light it emits can effectively eliminate residual charge on the surface of the photosensitive drum 202, restoring the surface potential of the photosensitive drum 202 to a uniform state.

[0043] In related technologies, the detection of the function of the power suppression device is usually based on the steady-state amplitude detection or level signal of the current or voltage in the power supply circuit of the power suppression device itself. The current detection signal, voltage detection signal, or high and low level signal is obtained by setting a sampling resistor or current detection element in the power supply circuit of the power suppression device itself, and the working status of the power suppression device is judged according to whether the steady-state amplitude of the signal is within the preset normal working range or whether the level state meets the expected state.

[0044] Understandably, the above solution can effectively identify complete failures of the current-eliminating device due to open or short circuits. However, it cannot effectively identify functional failures of the current-eliminating device when the power supply circuit is conducting. That is, it cannot verify whether the operation of the current-eliminating device truly changes the surface potential of the photosensitive drum and achieves the expected current-eliminating effect. Examples include light intensity attenuation due to aging of the lamp beads, light failing to reach the photosensitive drum surface due to misalignment, or the absence of light guides / strips. In these situations, the power supply circuit of the current-eliminating device remains conducting, and its current or voltage steady-state amplitude may still be within the normal range or the signal level may still meet expectations. Therefore, the above solution cannot effectively identify functional failures caused by non-physical open or short circuits, potentially leading to misjudgments that the current-eliminating device is working normally. This results in residual charges on the photosensitive drum surface not being fully eliminated, thus affecting image formation quality.

[0045] To address the aforementioned issues, this embodiment controls the power-extinguishing device to perform a switching action according to a preset change pattern. This switching action causes fluctuations in the surface charge of the photosensitive drum corresponding to the preset change pattern. A detection signal characterizing the change in surface charge of the photosensitive drum is acquired, and the signal component caused by the switching action of the power-extinguishing device is extracted from the detection signal as the target fluctuation component. The change characteristics of the target fluctuation component are determined to match the preset change pattern. If they match, the power-extinguishing device is deemed functionally effective; otherwise, it is deemed functionally ineffective. It is understood that this embodiment can identify functional failures caused by lamp aging or installation misalignment even when the power supply circuit of the power-extinguishing device is in a conductive state, reducing the probability of misjudging the normal operation of the power-extinguishing device and improving image formation quality to a certain extent.

[0046] It should be noted that the switching action only applies to the blackout lamp, and the light guide column is a passive optical transmission component that passively outputs corresponding light as the blackout lamp is switched on and off. This will not be repeated in subsequent embodiments. Specifically, a detailed description will be provided below in conjunction with the accompanying drawings and specific embodiments.

[0047] See Figure 3 This is a schematic flowchart illustrating a detection method for a static electricity dissipation device provided in an embodiment of this application. This method can be applied to the application scenarios described above, such as... Figure 3 As shown, it mainly includes the following steps.

[0048] Step S301: Control the power-off device to perform switching actions according to the preset change pattern.

[0049] In this embodiment, before detecting the current-eliminating device, the charging roller first applies a voltage to the surface of the photosensitive drum, forming a uniform charge layer on the surface. After the uniform charge layer is formed on the surface of the photosensitive drum, the current-eliminating device is controlled to perform a switching action according to a preset change pattern. That is, the current-eliminating lamp alternates between a powered-on state and a powered-off state, and this switching follows a preset change rule. For example, the preset change pattern can be a periodic alternation rule, such as maintaining the lit state for a first duration before switching to the off state, maintaining the off state for a second duration before switching back to the lit state, and so on.

[0050] It should be noted that the control unit can store the above-mentioned preset change rules in advance, or it can generate and output the corresponding control signals in real time when the method is executed. This application embodiment does not impose absolute limitations on this.

[0051] When the neutralizing lamp is lit, it emits light that shines on the surface of the photosensitive drum, neutralizing and eliminating the charge in the illuminated area. When the lamp is off, it stops emitting light, and the charge in the unilluminated areas of the photosensitive drum remains. As the neutralizing lamp alternates between lit and off states according to a preset pattern, the amount of charge on the photosensitive drum surface correspondingly alternates between the neutralized and unneutralized states, thus generating fluctuations corresponding to the preset pattern.

[0052] Taking a fixed switching cycle with a preset change pattern as an example, see [link / reference]. Figure 4 This is a schematic diagram of the surface charge of a photosensitive drum provided in an embodiment of this application. As shown in the figure, in Figure 2 Based on this, after the charging roller 201 applies voltage to the surface of the photosensitive drum 202, a uniform charge layer is formed on the surface of the photosensitive drum 202. After the static elimination device 203 irradiates the photosensitive drum 202 according to the preset change pattern, a charge distribution 401 corresponding to the preset change pattern will be formed on the surface of the photosensitive drum 202.

[0053] Understandably, the charge distribution corresponding to the preset change pattern reflects the actual ability of the charge elimination device to eliminate charge on the surface of the photosensitive drum. If the charge elimination device functions normally, the fluctuation is real and can be detected by subsequent steps. If the charge elimination device fails to effectively illuminate the surface of the photosensitive drum due to reasons such as aging of the charge elimination lamp beads, misalignment, or absence of the light guide, the fluctuation does not exist or cannot be effectively detected. When the light guide is misaligned, not installed, or the light inlet is not directly facing the charge elimination lamp, even if the charge elimination lamp is switched on and off normally, no light will shine on the drum surface, causing the photosensitive drum potential to fail to change with the charge elimination action.

[0054] Step S302: Acquire a detection signal characterizing the change in surface charge of the photosensitive drum, and extract the target wave component from the detection signal.

[0055] In the aforementioned steps, after the current-eliminating device performs a switching action according to a preset change pattern, the amount of charge on the surface of the photosensitive drum fluctuates according to the preset change pattern. This fluctuation in charge can be obtained through appropriate detection methods. In this embodiment, a detection signal characterizing this charge change is first obtained. The detection signal carries information about the charge change on the surface of the photosensitive drum, and its specific form may vary depending on the detection method, but the detection signal contains a change component related to the switching action of the current-eliminating device.

[0056] After acquiring the detection signal, the target fluctuation component is extracted from it. The target fluctuation component refers to the signal component in the detection signal caused by the switching action of the current suppression device. The detection signal may contain multiple signal components, including those related to the switching action of the current suppression device, as well as other components. The target fluctuation component specifically refers to the signal component caused by the switching action of the current suppression device, and its variation pattern corresponds to the preset variation pattern of the current suppression device.

[0057] In one possible implementation, the image forming apparatus further includes a charging roller, the power supply circuit of which is used to supply charge to the surface of the photosensitive drum. It is understood that when the charge on the surface of the photosensitive drum changes, the load current of the charging roller supplying charge to the photosensitive drum will change accordingly, and this change in load current can reflect the change in the charge on the surface of the photosensitive drum.

[0058] By acquiring the current detection signal in the charging roller power supply circuit, the change in the load current can be obtained in real time. Furthermore, since a sampling resistor is typically installed in the power supply circuit, and the voltage across this resistor is directly proportional to the current flowing through it, the change in load current can also be indirectly reflected by acquiring this voltage detection signal. The current detection signal and the voltage detection signal can be substituted for each other. In practical circuit design, the current detection method or the voltage detection method can be flexibly selected according to the existing circuit configuration; this application does not impose specific restrictions in this regard.

[0059] After acquiring the current or voltage detection signal from the charging roller power supply circuit, the acquired signal needs to be processed to extract the target fluctuation component. The current change caused by the switching of the current suppression device is superimposed on the DC base of the charging roller power supply circuit, and its amplitude is relatively small compared to the DC base. If the detection signal is not processed and the total signal is directly acquired, this small AC change is easily masked. Therefore, the detection signal can be filtered and amplified to extract the AC fluctuation component caused by the switching action of the current suppression device as the target fluctuation component.

[0060] Specifically, the current detection signal or voltage detection signal is filtered and amplified to extract the AC fluctuation component caused by the switching action of the current suppression device as the target fluctuation component. The filtering process separates the DC component from the AC fluctuation component, while the amplification process increases the amplitude of the AC fluctuation component to a level suitable for subsequent acquisition and analysis.

[0061] Furthermore, in one specific implementation of filtering and amplification, the current detection signal or voltage detection signal is first subjected to high-pass filtering to remove the DC bias component and determine the AC fluctuation component. The detection signal in the charging roller power supply circuit contains both DC and AC components. The DC component corresponds to the steady-state load current that supplies charge from the charging roller to the photosensitive drum; this component does not change with the switching action of the current suppression device. The AC component corresponds to the current fluctuation caused by the switching action of the current suppression device; this component changes with the switching action of the current suppression device. High-pass filtering allows high-frequency or AC components in the signal to pass through while blocking low-frequency or DC components, thus filtering out the DC bias component in the detection signal and retaining only the AC fluctuation component.

[0062] The AC fluctuation components extracted after high-pass filtering may still contain high-frequency interference noise generated by the circuit itself. This high-frequency interference noise is not caused by the switching action of the power suppression device, and its presence may interfere with subsequent judgments. Therefore, low-pass filtering can be applied to the AC fluctuation components to remove the high-frequency interference noise. Low-pass filtering allows low-frequency components of the signal to pass while blocking high-frequency components, thus preserving the AC fluctuation components caused by the switching action of the power suppression device.

[0063] The amplitude of the AC fluctuation component after high-pass and low-pass filtering may still be relatively small. The filtered AC fluctuation component can be amplified to determine its amplitude, making it suitable for subsequent data acquisition and analysis. The amplification process can employ either in-phase or out-of-phase amplification; this application does not impose absolute limitations on this method.

[0064] The amplified AC fluctuation component can be acquired by an analog-to-digital converter (ADC) to obtain the amplified AC fluctuation component, and the target fluctuation component can be determined based on the amplified AC fluctuation component. Specifically, the ADC can sample the amplified AC fluctuation component at a preset sampling frequency, converting the analog signal form of the AC fluctuation component into a digital signal form as the target fluctuation component, so that subsequent steps can perform digital judgment and processing.

[0065] To facilitate understanding of the specific processes of filtering and amplification described above, the following explanation uses a voltage detection signal as an example, with reference to the accompanying drawings.

[0066] See Figure 5A The figure shows a waveform of a voltage detection signal provided in an embodiment of this application. As shown, waveform 501 in the figure represents the voltage detection signal without filtering and amplification. Here, t1 is the start time, and t2 is the end time. It can be seen from waveform 501 that the voltage detection signal is superimposed on a relatively high DC base component (V3), while the AC fluctuation component caused by the switching action of the power suppression device has a smaller amplitude relative to the DC base component, appearing as only relatively small fluctuations in waveform 501. If this voltage detection signal is directly used for subsequent judgment, the AC fluctuation component is easily submerged by the DC base component, making it difficult to effectively acquire and identify. Therefore, high-pass filtering is required to separate the AC fluctuation component from the voltage detection signal.

[0067] See Figure 5B The figure shows a waveform of an AC fluctuation component provided in an embodiment of this application. As shown in the figure, waveform 502 is the AC fluctuation component after high-pass filtering of the voltage detection signal shown in waveform 501. t1 is the start time, and t2 is the end time. It can be seen from waveform 502 that after high-pass filtering, the DC base component in the voltage detection signal is filtered out, and waveform 502 fluctuates around the zero potential V0, no longer superimposed on the DC base component. The AC fluctuation component after high-pass filtering can be observed to show fluctuations corresponding to the switching action of the power suppression device, but some sharp, burr-like components still exist in waveform 502. These components belong to the high-frequency interference noise generated by the circuit itself.

[0068] See Figure 5C This figure shows a waveform diagram of AC fluctuation components for filtering high-frequency interference noise, provided in an embodiment of this application. As shown, waveform 503 represents the AC fluctuation component after low-pass filtering of the AC fluctuation component shown in waveform 502. t1 is the start time, and t2 is the end time. It can be seen from waveform 503 that after low-pass filtering, the sharp, jagged components in waveform 502 are filtered out, and waveform 503 exhibits a smooth, undulating shape. V1 is the amplitude of the current waveform, which corresponds to the voltage fluctuation amplitude caused by the switching action of the power suppression device.

[0069] See Figure 5DThis figure shows a waveform of an amplified AC fluctuation component provided in an embodiment of this application. As shown in the figure, waveform 504 is the AC fluctuation component after amplification of the AC fluctuation component shown in waveform 503. t1 is the start time, and t2 is the end time. It can be seen from waveform 504 that after amplification, the amplitude of the AC fluctuation component increases from V1 to V2, where V2 is greater than V1. However, the change pattern of waveform 504 remains consistent with that of waveform 503, and its change period still corresponds to the switching cycle of the power suppression device. After amplification, the amplitude of this AC fluctuation component reaches a level suitable for subsequent analog-to-digital conversion unit acquisition and digitization, thus it can be used as a target fluctuation component for subsequent judgment steps.

[0070] In some embodiments of this application, the amplification unit is powered by a dual power supply (e.g., ±5V), therefore the amplified AC fluctuation component (e.g.) Figure 5D As shown, the alternation of positive and negative values ​​is fully preserved, and the negative amplitude is not truncated.

[0071] In other embodiments of this application, the amplification unit is powered by a single power supply (e.g., 0~5V), so the amplified AC fluctuation component retains only the positive amplitude characteristic, while the negative amplitude is truncated. Regardless of the power supply method, the variation period of the AC fluctuation component corresponds to the switching period of the current suppression device, which can be used for subsequent judgment.

[0072] In another implementation, the image forming apparatus further includes an image scanning unit. Changes in the surface charge of the photosensitive drum further affect the adhesion density of the toner on the photosensitive drum surface during development. This density difference manifests as a difference in image density after transfer to the imaging medium or transfer belt. By reading the formed detection image, a detection signal reflecting this density distribution can be obtained. Specifically, the image forming apparatus is controlled to form a detection image on the imaging medium or transfer belt, the imaging signal of the detection image is acquired by the image scanning unit, and the imaging signal is used as the detection signal.

[0073] After the image forming apparatus completes the image forming process, the imaging medium or transfer belt carries an image formed by toner. The density distribution of this image corresponds to the charge distribution on the surface of the photosensitive drum. When the de-energizing device performs a switching action according to a preset pattern, the charge on the surface of the photosensitive drum fluctuates accordingly. This fluctuation affects the amount of toner adhering during the development stage, thus causing a corresponding change in the density of the corresponding area in the final detection image. Therefore, by acquiring the imaging signal of the detection image, the signal component corresponding to the switching action of the de-energizing device can be extracted. This imaging signal can replace the current detection signal or voltage detection signal in the charging roller power supply circuit as the detection signal.

[0074] The image scanning unit can be located inside the image forming apparatus or it can be an external device connected to the image forming apparatus; this application does not impose absolute limitations on this. For example, the image scanning unit can be a scanner communicatively connected to the image forming apparatus. This scanner scans the detection image on the imaging medium, generates an imaging signal, and transmits it to the control unit of the image forming apparatus. Regardless of the specific form, as long as the image scanning unit can acquire the density distribution information of the detection image and generate the corresponding imaging signal, it is acceptable.

[0075] It should be noted that using the imaging signal as the detection signal allows for the detection of the power dissipation device function without connecting to the charging roller power supply circuit. This method is parallel to the aforementioned method of obtaining the detection signal through the charging roller power supply circuit. In practical applications, one method can be selected based on the hardware configuration of the image forming apparatus, or both methods can be used simultaneously to obtain the detection signal for mutual verification. This application does not impose an absolute limitation on this.

[0076] Step S303: Determine whether the change characteristics of the target fluctuation component match the preset change pattern.

[0077] In the aforementioned steps, the target fluctuation component is the signal component caused by the switching action of the current suppression device. Since the switching action of the current suppression device is performed according to a preset change pattern, under normal functioning conditions, the change characteristics of the target fluctuation component should correspond to the preset change pattern.

[0078] In this embodiment of the application, the change characteristics of the target fluctuation component are judged to determine whether the change characteristics match the preset change law.

[0079] The variation characteristics of the target fluctuation component can include various observable attributes, such as the frequency of change, the period of change, the phase of change, and the waveform shape. Determining whether the variation characteristics of the target fluctuation component match a preset variation pattern means determining whether at least one observable attribute of the target fluctuation component maintains a predetermined correlation with the preset variation pattern. For example, if the preset variation pattern is that the power suppression device performs switching actions in a periodic manner, then the variation period of the target fluctuation component should correspond to the switching period of the power suppression device. If the preset variation pattern is that the power suppression device performs switching actions in a non-periodic specific sequence, then the variation timing of the target fluctuation component should correspond to that specific sequence.

[0080] In one possible implementation, the preset variation pattern can be specifically a preset frequency. When the current-eliminating device performs a switching action according to the preset frequency, the current-eliminating lamp alternates between the lit and extinguished states at this preset frequency. Correspondingly, when the current-eliminating device is functioning normally, the fluctuations in the charge generated on the surface of the photosensitive drum should also have a fluctuation frequency corresponding to this preset frequency; therefore, the target fluctuation component carries this fluctuation frequency information.

[0081] In this implementation, determining whether the variation characteristics of the target fluctuation component match a preset variation pattern can be achieved by comparing the fluctuation frequency with the preset frequency. Specifically, the fluctuation frequency of the target fluctuation component is first obtained. The fluctuation frequency of the target fluctuation component can be obtained by frequency analysis of the target fluctuation component, such as by performing a Fourier transform on the target fluctuation component or using a zero-crossing detection method to extract its frequency information. This application embodiment does not impose an absolute limitation on the specific method of frequency acquisition. After obtaining the fluctuation frequency, the difference between the fluctuation frequency and the preset frequency is calculated. The absolute value of this difference reflects the degree of deviation between the actual fluctuation frequency of the target fluctuation component and the preset frequency of the power dissipation device.

[0082] If the difference is less than or equal to the preset difference, it indicates that the deviation between the fluctuation frequency of the target fluctuation component and the preset frequency of the current suppression device is within the allowable range, and the variation characteristics of the target fluctuation component can be considered to match the preset variation law. If the difference is greater than the preset difference, it indicates that the deviation between the fluctuation frequency of the target fluctuation component and the preset frequency of the current suppression device exceeds the allowable range, and the variation characteristics of the target fluctuation component can be considered to not match the preset variation law.

[0083] Step S304: If the change characteristics of the target fluctuation component match the preset change law, the current suppression device is deemed to be effective; if the change characteristics of the target fluctuation component do not match the preset change law, the current suppression device is deemed to be ineffective.

[0084] In this embodiment, when the variation characteristics of the target fluctuation component match the preset variation pattern, it indicates that the target fluctuation component in the detection signal does indeed originate from the switching action of the power elimination device, that is, the switching action of the power elimination device does indeed cause regular fluctuations in the charge on the surface of the photosensitive drum. This indicates that the light emitted by the power elimination device can effectively irradiate the surface of the photosensitive drum and actually neutralize and eliminate the charge on the surface of the photosensitive drum. The power elimination device is in normal working condition, therefore it can be determined that the power elimination device is functionally effective.

[0085] When the variation characteristics of the target fluctuation component do not match the preset variation pattern, it indicates that the target fluctuation component in the detection signal does not originate from the switching action of the current suppression device. In other words, the switching action of the current suppression device failed to cause the expected regular fluctuation of the charge on the photosensitive drum surface. This could be due to factors such as aging of the current suppression lamp beads leading to attenuation of the light output intensity, misalignment of the current suppression device causing the light to fail to accurately illuminate the photosensitive drum surface, an open circuit or short circuit fault in the current suppression lamp itself, or the absence of a light guide post. Regardless of the specific cause, in the above situations, the current suppression device fails to have any actual effect on the charge on the photosensitive drum surface; therefore, it can be determined that the current suppression device has malfunctioned.

[0086] In some embodiments of this application, the power suppression function status is determined based on the target fluctuation components collected by the analog-to-digital conversion unit, using the amplitude and frequency characteristics of the target fluctuation components. The specific correspondence is as follows: The power suppression function is effective: the target fluctuation component frequency is strictly in phase and frequency with the preset PWM switching frequency of the power suppression lamp, and the amplitude is within the normal threshold range, fluctuating regularly as the power suppression lamp turns on and off.

[0087] Soft failure of power suppression function (lamp light decay / partial displacement of light guide column / dirt on the surface of power suppression lamp): The frequency of the target fluctuation component is still consistent with the preset switching frequency, but the amplitude is lower than the normal threshold. The corresponding power suppression excitation exists but the intensity is insufficient, and the charge fluctuation of the photosensitive drum is weakened.

[0088] Intermittent failure of the power suppression function (poor soldering of power supply to the power suppression lamp / poor contact of the connector): The target fluctuation component sometimes fluctuates at the same frequency as the preset switching frequency, sometimes disappears to a fixed DC level (straight line), or the amplitude jumps randomly without a stable pattern. The corresponding power suppression excitation is intermittent, which is between soft failure and complete failure.

[0089] The power suppression function is completely ineffective (power suppression lamp is open-circuited / missing / light guide column not installed / light guide column is severely offset / light path is completely blocked): the target fluctuation component does not fluctuate at the same frequency as the preset switching frequency, and the amplitude approaches 0 (the acquisition is a fixed DC level / straight waveform). The corresponding power suppression action does not change the surface charge of the photosensitive drum at all, and there is no current fluctuation in the charging roller.

[0090] It should be noted that when the light guide column is not installed or is severely offset, the light path is 100% blocked, and there is no charge fluctuation, so the output is a straight line; when the light guide column is partially offset, the light path is partially conductive, retaining the same frequency but with a reduced amplitude. These two are respectively considered complete failure and soft failure, and the judgment logic does not conflict with each other.

[0091] The polarity of the fluctuation varies with the charging bias strategy or the power supply method of the amplifier circuit. When making a judgment, only the absolute value of the amplitude and the frequency matching degree are considered, and the positive and negative directions of the fluctuation are not restricted.

[0092] In some embodiments of this application, the correspondence between fault determination in the image domain and the target fluctuation component (i.e., image density response) is as follows: The power suppression function is effective when the correlation coefficient ρ between the density signal D(x) and the preset period T is greater than or equal to the preset threshold, the response amplitude Af is within the normal range, the phase is consistent with the power suppression switch, and the corresponding power suppression excitation is effectively converted into image density modulation.

[0093] Soft failure of power suppression function (lamp light decay / partial displacement of light guide column / dirt on the surface of power suppression lamp): Af is lower than the normal threshold, ρ is still ≥ the threshold but has decreased, and the fluctuation frequency is strictly in sync with the preset period T.

[0094] Intermittent failure of the power suppression function (poor soldering of power supply to the power suppression lamp / poor contact of the connector): the density signal sometimes shows modulation patterns with the same frequency as the preset period T, and sometimes it is uniform without patterns, and Af and ρ jump randomly.

[0095] The power suppression function is completely ineffective (power suppression lamp is open-circuited / missing / light guide pillar not installed / light guide pillar is severely offset / light path is completely blocked): Af approaches 0, ρ is below the threshold, and there are no same frequency density patterns corresponding to the preset period T.

[0096] If the power-extinguishing device is determined to be malfunctioning, the image forming apparatus may further output a prompt message to notify the user that the power-extinguishing device is abnormal. This prompt message may be displayed as text on the control panel of the image forming apparatus, or it may be presented through sound or flashing indicator lights; this embodiment does not impose absolute limitations on this.

[0097] In some embodiments of this application, different prompting strategies are implemented based on the different types of failures of the power dissipation device.

[0098] In this embodiment, the power-extinguishing device is controlled to perform a switching action according to a preset change pattern. This switching action causes fluctuations in the surface charge of the photosensitive drum corresponding to the preset change pattern. A detection signal characterizing the change in surface charge of the photosensitive drum is acquired, and the signal component caused by the switching action of the power-extinguishing device is extracted from the detection signal as the target fluctuation component. The change characteristics of the target fluctuation component are determined to match the preset change pattern. If they match, the power-extinguishing device is deemed functionally effective; otherwise, it is deemed functionally ineffective. It is understood that this embodiment can identify functional failures caused by aging or misaligned installation of the power-extinguishing lamp beads, or the absence of a light guide column, even when the power supply circuit of the power-extinguishing device is in a conductive state. This reduces the probability of misjudging the normal operation of the power-extinguishing device and improves image formation quality to a certain extent.

[0099] Corresponding to the above method embodiments, this application also provides a detection device for an anti-static device. Specifically, see... Figure 6This is a schematic diagram of the structure of a detection device for an electric shock device provided in an embodiment of this application. As shown in the figure, the detection device 600 for the electric shock device is illustrated. The detection device 600 for the electric shock device specifically includes a control unit 601, a signal acquisition unit 602, a signal processing unit 603, a judgment unit 604, and a determination unit 605.

[0100] Specifically, the control unit 601 is used to control the current-eliminating device to perform switching actions according to a preset change pattern; the signal acquisition unit 602 is used to acquire a detection signal characterizing the change in charge on the surface of the photosensitive drum; the signal processing unit 603 is used to extract the target fluctuation component from the detection signal; the judgment unit 604 is used to judge whether the change characteristics of the target fluctuation component match the preset change pattern; the determination unit 605 is used to determine that the current-eliminating device is functional when the change characteristics of the target fluctuation component match the preset change pattern, and to determine that the current-eliminating device is functional when the change characteristics of the target fluctuation component do not match the preset change pattern.

[0101] For details on the implementation method, please refer to the description in the above method embodiment section. For the sake of brevity, this application will not elaborate further here.

[0102] In one possible implementation, the signal acquisition unit may include a sampling resistor connected in series in the power supply circuit of the charging roller. This sampling resistor is used to acquire the voltage detection signal in the power supply circuit of the charging roller. Specifically, the sampling resistor is connected in series in the power supply circuit of the charging roller, and the load current flowing through the power supply circuit of the charging roller generates a corresponding voltage drop across the sampling resistor. This voltage drop is then acquired as the voltage detection signal.

[0103] The signal processing unit may include a high-pass filter circuit, a low-pass filter circuit, an amplifier circuit, and an analog-to-digital converter. The high-pass filter circuit is connected to the output of the sampling resistor and is used to filter out the DC base component in the voltage detection signal, acquiring the AC fluctuation component. The voltage detection signal acquired by the sampling resistor contains both a DC base component and an AC fluctuation component. As described in the method embodiment section above, the DC base component corresponds to the steady-state load current that supplies charge from the charging roller to the photosensitive drum; this component does not change with the switching action of the current suppression device. The AC fluctuation component corresponds to the current fluctuation caused by the switching action of the current suppression device; this component changes with the switching action of the current suppression device. The high-pass filter circuit allows the AC component in the signal to pass through while blocking the DC component, thus filtering out the DC base component and retaining only the AC fluctuation component.

[0104] A low-pass filter circuit is connected to the output of a high-pass filter circuit to filter out high-frequency interference noise in the AC fluctuation component. The AC fluctuation component extracted after high-pass filtering may still contain high-frequency interference noise generated by the circuit itself. This high-frequency interference noise is not caused by the switching action of the current suppression device, and its presence may interfere with subsequent judgments. The low-pass filter circuit allows low-frequency components of the signal to pass while blocking high-frequency components, thus filtering out high-frequency interference noise and retaining the AC fluctuation component caused by the switching action of the current suppression device.

[0105] An amplifier circuit is connected to the output of a low-pass filter circuit to amplify the filtered AC fluctuation component, obtaining an amplified AC fluctuation component. The amplitude of the AC fluctuation component after high-pass and low-pass filtering may be small, which is not conducive to subsequent acquisition and judgment. The amplifier circuit amplifies this AC fluctuation component, increasing its amplitude to a level suitable for subsequent acquisition and judgment. The amplifier circuit can be a non-inverting amplifier or an inverting amplifier; this application does not impose an absolute limitation on this.

[0106] The analog-to-digital converter (ADC) is connected to the output of the amplifier circuit. It is used to acquire the amplified AC fluctuation component and determine the target fluctuation component based on the amplified AC fluctuation component. The ADC samples the amplified AC fluctuation component at a preset sampling frequency, converting the analog signal of the AC fluctuation component into a digital signal for subsequent judgment and processing by the judgment unit.

[0107] To facilitate understanding of the specific implementation of the above hardware structure, the connection relationship and signal flow of the signal acquisition unit and the signal processing unit are explained below with reference to the accompanying drawings.

[0108] See Figure 7 This is a schematic diagram of the circuit structure of a current-eliminating device detection circuit provided in an embodiment of this application. Figure 7 As shown, the detection circuit of the power elimination device includes a charging roller 201, a photosensitive drum 202, a power supply circuit for the charging roller, a signal acquisition unit 701, a high-pass filter circuit 702, a low-pass filter circuit 703, an amplifier circuit 704, and an analog-to-digital conversion unit 705.

[0109] like Figure 7 Specifically, as shown in the circuit structure, the signal acquisition unit 701 can be composed of a first resistor R1. The high-pass filter circuit 702 can be composed of a second resistor R2 and a first capacitor C1. The low-pass filter circuit 703 can be composed of a third resistor R3 and a second capacitor C2. The amplifier circuit 704 can be composed of an amplifier U1, a fourth resistor R4, and a fifth resistor R5. It should be noted that the above circuit structure is only an exemplary illustration, and in specific implementations, those skilled in the art can adaptively adjust it according to the functions of different circuits.

[0110] The specific connection is as follows: The first resistor R1 is connected in series in the power supply circuit of the charging roller, and the power supply circuit of the charging roller is grounded through the first resistor R1. The non-grounded end of the first resistor R1 (i.e., point A) is electrically connected to the first terminal of the first capacitor C1, and the second terminal of the first capacitor C1 is grounded through the second resistor R2. The node between the first capacitor C1 and the second resistor R2 (i.e., point B) is electrically connected to the first terminal of the third resistor R3. The second terminal of the third resistor R3 is grounded through the second capacitor C2. The node between the third resistor R3 and the second capacitor C2 (i.e., point C) is electrically connected to the positive input terminal of amplifier U1. The negative input terminal of amplifier U1 is electrically connected to the output terminal of amplifier U1 through the fifth resistor R5, and the negative input terminal of amplifier U1 is also grounded through the fourth resistor R4. The output terminal of amplifier U1 is electrically connected to the analog-to-digital converter unit 705 through the sixth resistor R6. The node between the output terminal of amplifier U1 and the sixth resistor R6 is denoted as point D.

[0111] The following combination Figure 7 Explain the circuit structure and signal flow.

[0112] like Figure 7 As shown, the first resistor R1 is connected in series in the power supply circuit of the charging roller. When the load current in the power supply circuit of the charging roller 201 flows through the first resistor R1, a voltage drop is generated across the first resistor R1. This voltage drop is output as a voltage detection signal from the non-grounded terminal (i.e., point A) of the first resistor R1. The voltage detection signal output at point A includes a DC base component and an AC fluctuation component superimposed on it. The DC base component corresponds to the steady-state load current that provides charge from the charging roller 201 to the photosensitive drum 202, and this part does not change with the switching action of the power elimination device. The AC fluctuation component corresponds to the current fluctuation caused by the switching action of the power elimination device, and this part changes with the switching action of the power elimination device.

[0113] A first capacitor C1 is connected in series between points A and B, and a second resistor R2 is connected between point B and ground. The first capacitor C1 and the second resistor R2 constitute a high-pass filter circuit. This high-pass filter circuit allows the AC component of the signal to pass through while blocking the DC component. Therefore, the signal output at point B is the AC ripple component after filtering out the DC base component. It can be understood that without this high-pass filter circuit, the DC base component would occupy most of the input range of the analog-to-digital converter, resulting in insufficient resolution of the AC ripple component, which would be easily overwhelmed by quantization noise.

[0114] The third resistor R3 is connected in series between points B and C, and the second capacitor C2 is connected between point C and ground. The third resistor R3 and the second capacitor C2 constitute a low-pass filter circuit. This low-pass filter circuit allows low-frequency components of the signal to pass through while blocking high-frequency components. Therefore, the signal output at point C is the AC fluctuation component after filtering out high-frequency interference noise. It can be understood that without this low-pass filter circuit, high-frequency interference noise may cause amplifier saturation or cause the analog-to-digital converter to acquire a noisy signal, affecting the accuracy of subsequent judgments.

[0115] The filtered AC fluctuation component output at point C is input to the positive input terminal of amplifier U1. The negative input terminal of amplifier U1 is grounded through the fourth resistor R4, and is also connected to the output terminal of amplifier U1 through the fifth resistor R5. Amplifier U1, the fourth resistor R4, and the fifth resistor R5 constitute a non-inverting amplifier circuit. The gain of this non-inverting amplifier circuit is determined by the resistance ratio of the fifth resistor R5 to the fourth resistor R4. Amplifier U1 amplifies the AC fluctuation component input at point C in a non-inverting manner, and outputs the amplified AC fluctuation component from the output terminal of amplifier U1 (i.e., point D).

[0116] The amplified AC fluctuation component output at point D is transmitted to the analog-to-digital converter (ADC) 705 via the sixth resistor R6. The sixth resistor R6 is connected in series between the output of amplifier U1 and the input of ADC 705 for current limiting and isolation. It prevents electrostatic discharge or overvoltage surges from the ADC 705 port from flowing back into amplifier circuit 704, thus protecting amplifier U1. ADC 705 samples and converts the received amplified AC fluctuation component to digital form, outputting the target fluctuation component as a digital signal for subsequent processing.

[0117] Corresponding to the above embodiments, this application also provides a schematic diagram of the structure of an electronic device. See also Figure 8 This is a schematic diagram of the structure of an electronic device provided in an embodiment of this application. The electronic device 800 may include a processor 801, a memory 802, and a communication unit 803. These components communicate through one or more buses. Those skilled in the art will understand that the structure of the electronic device shown in the figure does not constitute a limitation on the embodiments of the present invention. It may be a bus-shaped structure or a star-shaped structure, and may include more or fewer components than shown, or combine certain components, or have different component arrangements.

[0118] The communication unit 803 is used to establish a communication channel, enabling the electronic device to communicate with other devices. It receives user data sent by other devices or sends user data to other devices.

[0119] The processor 801 serves as the control center of the electronic device, connecting various parts of the device via various interfaces and lines. It executes software programs, instructions, and / or modules stored in the memory 802, and calls data stored in the memory to perform various functions and / or process data. The processor can be composed of integrated circuits (ICs), such as a single packaged IC or multiple packaged ICs with the same or different functions connected together. For example, the processor 801 may consist only of a central processing unit (CPU). In this embodiment, the CPU may have a single processing core or include multiple processing cores.

[0120] The memory 802 is used to store the execution instructions of the processor 801. The memory 802 can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic storage, flash memory, magnetic disk or optical disk.

[0121] When the execution instructions in memory 802 are executed by processor 801, the electronic device 800 is able to perform operations. Figure 3 Some or all of the steps in the illustrated embodiments.

[0122] In a specific implementation, this application also provides a computer storage medium, wherein the computer storage medium may store a program, and when the program is executed, it may include some or all of the steps in the various embodiments of the simulation scene generation method provided by this invention. The storage medium may be a magnetic disk, optical disk, read-only memory (ROM), or random access memory (RAM), etc.

[0123] In this application embodiment, "at least one" refers to one or more, and "more than one" refers to two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent the existence of A alone, the simultaneous existence of A and B, or the existence of B alone. A and B can be singular or plural. The character " / " generally indicates that the preceding and following related objects have an "or" relationship. "At least one of the following" and similar expressions refer to any combination of these items, including any combination of single or plural items. For example, at least one of a, b, and c can represent: a, b, c, ab, ac, bc, or abc, where a, b, and c can be single or multiple.

[0124] Those skilled in the art will recognize that the units and algorithm steps described in the embodiments disclosed herein can be implemented using electronic hardware, computer software, or a combination of electronic hardware and software. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0125] Those skilled in the art will understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0126] In the several embodiments provided in this application, any function, if implemented as a software functional unit and sold or used as an independent product, can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0127] The same or similar parts between the various embodiments in this specification can be referred to mutually. In particular, the device embodiments and terminal embodiments are basically similar to the method embodiments, so the description is relatively simple, and the relevant parts can be referred to the description in the method embodiments.

Claims

1. A method for detecting an anti-static device, characterized in that, Applied to an image forming apparatus, the image forming apparatus including a photosensitive drum and a current-eliminating device, the method includes: The current-eliminating device is controlled to perform switching actions according to a preset change pattern. The switching action of the current-eliminating device is used to cause the charge on the surface of the photosensitive drum to fluctuate in accordance with the preset change pattern. Acquire a detection signal characterizing the change in surface charge of the photosensitive drum, and extract a target fluctuation component from the detection signal, wherein the target fluctuation component is the signal component caused by the switching action of the power elimination device; Determine whether the variation characteristics of the target fluctuation component match the preset variation pattern; If the change characteristics of the target fluctuation component match the preset change pattern, the current suppression device is deemed to be functional; if the change characteristics of the target fluctuation component do not match the preset change pattern, the current suppression device is deemed to be functional.

2. The method according to claim 1, characterized in that, The image forming apparatus further includes a charging roller, the power supply circuit of which is used to provide charge to the surface of the photosensitive drum; The acquisition of the detection signal characterizing the change in surface charge of the photosensitive drum includes: Obtain the current detection signal or voltage detection signal in the power supply circuit of the charging roller, and use the current detection signal or the voltage detection signal as the detection signal.

3. The method according to claim 1, characterized in that, The image forming apparatus further includes: an image scanning unit; the acquisition of the detection signal characterizing the change in surface charge of the photosensitive drum includes: The image forming apparatus is controlled to form a detection image on an imaging medium or transfer belt; The imaging signal of the detection image is obtained by the image scanning unit, and the imaging signal is used as the detection signal.

4. The method according to claim 2, characterized in that, Extracting the target fluctuation component from the detected signal includes: The current detection signal or the voltage detection signal is filtered and amplified to extract the AC fluctuation component caused by the switching action of the power elimination device as the target fluctuation component.

5. The method according to claim 4, characterized in that, Filtering and amplifying the current detection signal or the voltage detection signal includes: The current detection signal or the voltage detection signal is subjected to high-pass filtering to remove the DC bias component and determine the AC fluctuation component. The AC fluctuation component is subjected to low-pass filtering to remove high-frequency interference noise from the AC fluctuation component; The AC fluctuation component after the filtering process is amplified to determine the amplified AC fluctuation component. The amplified AC fluctuation component is collected, and the target fluctuation component is determined based on the amplified AC fluctuation component.

6. The method according to claim 1, characterized in that, The preset change pattern is a preset frequency, and the step of determining whether the change characteristics of the target fluctuation component match the preset change pattern includes: Obtain the fluctuation frequency of the target fluctuation component; Calculate the difference between the fluctuation frequency and the preset frequency or the preset period; If the difference is less than or equal to a preset difference, it is determined that the change characteristics of the target fluctuation component match the preset change pattern; if the difference is greater than the preset difference, it is determined that the change characteristics of the target fluctuation component do not match the preset change pattern.

7. A detection device for an anti-static device, characterized in that, Applied to an image forming apparatus, the image forming apparatus including a photosensitive drum and a current elimination device, the apparatus comprising: The control unit is used to control the current elimination device to perform switching actions according to a preset change pattern. The switching actions of the current elimination device are used to cause the charge on the surface of the photosensitive drum to fluctuate in accordance with the preset change pattern. A signal acquisition unit is used to acquire a detection signal characterizing the change in surface charge of the photosensitive drum; A signal processing unit is used to extract a target fluctuation component from the detection signal, wherein the target fluctuation component is a signal component caused by the switching action of the power elimination device; The judgment unit is used to determine whether the change characteristics of the target fluctuation component match the preset change law; The determination unit is used to determine that the current suppression device is functional when the change characteristics of the target fluctuation component match the preset change law; and to determine that the current suppression device is functional when the change characteristics of the target fluctuation component do not match the preset change law.

8. The apparatus according to claim 7, characterized in that, The image forming apparatus further includes a charging roller, the power supply circuit of which is used to provide charge to the surface of the photosensitive drum; The signal acquisition unit includes a sampling resistor connected in series in the power supply circuit of the charging roller, and the sampling resistor is used to acquire the voltage detection signal in the power supply circuit of the charging roller. The signal processing unit includes: A high-pass filter circuit is connected to the output terminal of the sampling resistor to filter out the DC bias component in the voltage detection signal and obtain the AC fluctuation component. A low-pass filter circuit is connected to the output of the high-pass filter circuit to filter out high-frequency interference noise in the AC fluctuation component. An amplifier circuit, connected to the output of the low-pass filter circuit, is used to amplify the filtered AC ripple component to obtain the amplified AC ripple component. An analog-to-digital converter is connected to the output of the amplifier circuit and is used to acquire the amplified AC fluctuation component and determine the target fluctuation component based on the amplified AC fluctuation component.

9. An electronic device, characterized in that, include: processor; Memory; And a computer program, wherein the computer program is stored in the memory, the computer program including instructions that, when executed by the processor, cause the electronic device to perform the method of any one of claims 1 to 6.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium includes a stored program, wherein, when the program is executed, it controls the device on which the computer-readable storage medium is located to perform the method according to any one of claims 1 to 6.

Images