CN220064617U - Input voltage detection system and image forming apparatus - Google Patents
Input voltage detection system and image forming apparatus Download PDFInfo
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- CN220064617U CN220064617U CN202321371232.9U CN202321371232U CN220064617U CN 220064617 U CN220064617 U CN 220064617U CN 202321371232 U CN202321371232 U CN 202321371232U CN 220064617 U CN220064617 U CN 220064617U
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- 238000001914 filtration Methods 0.000 claims description 18
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 15
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Abstract
The embodiment of the utility model provides an input voltage detection system and an image forming device. The input voltage detection system includes: the input circuit is used for acquiring an input voltage and converting the input voltage into a primary voltage; a transformer unit for outputting a secondary voltage according to the primary voltage; an operational amplifier circuit for converting the secondary voltage into an operational voltage and transmitting the operational voltage to a sub-controller; the auxiliary controller is used for determining an input voltage according to the operation voltage and sending the input voltage to the main controller; the main controller is used for judging whether the input voltage is abnormal or not; if the input voltage is abnormal, the abnormal fault of the input voltage of the fixing heating circuit is determined, the fixing heating circuit is controlled to stop heating, and an input voltage abnormal signal is sent to the auxiliary controller, so that the auxiliary controller controls the fixing heating circuit to stop heating according to the input voltage abnormal signal, and the use experience of a user is improved.
Description
[ field of technology ]
The embodiment of the utility model relates to the technical field of fixing heating safety control, in particular to an input voltage detection system and an image forming device.
[ background Art ]
In the related art, an image forming apparatus is provided with only one core controller, i.e., a System on Chip (SoC) for short. When the SoC operates in an environment where the input voltage is unstable (the input voltage fluctuates greatly), if the SoC detects an abnormality in the input voltage, the SoC stops operating. In addition, due to safety consideration, even if the subsequent input voltage is recovered to be normal, the SoC cannot be recovered to be normal, and the SoC can be recovered to be normally used after field confirmation of maintenance personnel, so that the use experience of a user is poor.
[ utility model ]
In view of the above, the embodiments of the present utility model provide an input voltage detection system and an image forming apparatus, which are used for solving the problem that when the SoC detects that the input voltage is abnormal and stops working, if the input voltage is recovered to be normal, the SoC cannot work normally, resulting in poor use experience of the user.
In a first aspect, an embodiment of the present utility model provides an input voltage detection system, including:
the input circuit is used for acquiring an input voltage and converting the input voltage into a secondary voltage;
a transformer unit for outputting a secondary voltage according to the primary voltage;
an operational amplifier circuit for converting the secondary voltage into an operational voltage and transmitting the operational voltage to a sub-controller; the method comprises the steps of carrying out a first treatment on the surface of the
The auxiliary controller is used for determining the input voltage according to the operation voltage and sending the input voltage to the main controller;
the main controller is used for judging whether the input voltage is abnormal or not; if the input voltage is abnormal, determining that the fixing heating circuit has an abnormal input voltage fault, controlling the fixing heating circuit to stop heating, and sending an abnormal input voltage signal to the auxiliary controller so that the auxiliary controller controls the fixing heating circuit to stop heating according to the abnormal input voltage signal.
In one possible implementation, the input circuit is connected with the transformer unit and the fixing heating circuit;
the transformer unit is connected with the operational amplifier circuit;
the operational amplifier circuit is connected with the auxiliary controller;
the auxiliary controller is connected with the main controller and the fixing heating circuit;
the main controller is connected with the fixing heating circuit.
In one possible implementation manner, the secondary controller is specifically configured to send the acquired model information of the image forming apparatus to the main controller when the image forming apparatus is started up for self-checking; the system is also used for receiving an electric signal which is sent by the main controller and represents the corresponding relation between the model information and the input voltage; and determining the input voltage according to the corresponding relation, and sending the input voltage to a main controller.
In one possible implementation manner, the sub-controller is specifically configured to obtain an operation voltage when the image forming apparatus is in an on state, determine the input voltage according to the operation voltage, and periodically send the input voltage to the main controller.
In one possible implementation, the fixing heating circuit includes a relay and a thyristor;
the main controller is specifically used for sending a relay turn-off signal, a silicon controlled rectifier turn-off signal and an engine power supply turn-off signal to control the fixing heating circuit to stop heating; the relay turn-off signal is used for indicating the relay to turn off, the silicon controlled rectifier turn-off signal is used for indicating the silicon controlled rectifier to turn off, and the engine power supply turn-off signal is used for indicating the engine power supply to turn off.
In one possible implementation, the fixing heating circuit includes a relay and a thyristor;
the auxiliary controller is specifically used for sending a relay turn-off signal and a silicon controlled rectifier turn-off signal to control the fixing heating circuit to stop heating; the relay turn-off signal is used for indicating the relay to turn off, and the silicon controlled turn-off signal is used for indicating the silicon controlled to turn off.
In one possible implementation, the input voltage detection system further includes a model detection circuit, the model detection circuit being connected to the sub-controller;
the model detection circuit is used for identifying model information of the image forming device and sending the model information to the auxiliary controller.
In one possible implementation, the input voltage detection system further includes a first rectifying and filtering circuit electrically connected with the transformer unit and the operational amplifier circuit;
the first rectifying and filtering circuit is used for converting the secondary voltage output by the transformer unit into direct-current voltage.
In one possible implementation, the input voltage detection system further includes a feedback circuit, a chip driving circuit, and a switching unit; the feedback circuit is electrically connected with the first rectifying and filtering circuit and the chip driving circuit, and the switch unit is electrically connected with the chip driving circuit and the transformer unit;
the feedback circuit is used for transmitting the direct-current voltage output by the first rectifying and filtering circuit to the chip driving circuit;
and the chip driving circuit is used for controlling the on and off of the switch unit.
In a second aspect, an embodiment of the present utility model provides an image forming apparatus including an input voltage detection system as in the first aspect or any possible implementation manner of the first aspect.
In the technical scheme provided by the embodiment of the utility model, when the main controller judges that the input voltage is abnormal, the fixing heating circuit is controlled to stop heating, an input voltage abnormal signal is sent to the auxiliary controller, and the auxiliary controller controls the fixing heating circuit to stop heating according to the input voltage abnormal signal. When the main controller detects that the input voltage is abnormal and stops working, if the input voltage is recovered to be normal, the main controller can recover to work without entering a fault mode to wait for maintenance, so that the use experience of a user is improved.
[ description of the drawings ]
In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present utility model, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of an input voltage detection system according to an embodiment of the present utility model;
FIG. 2 is a schematic diagram of another input voltage detection system according to an embodiment of the present utility model;
fig. 3 is a schematic structural diagram of an image forming apparatus according to an embodiment of the present utility model.
[ detailed description ] of the utility model
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments of the present utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
It should be understood that the described embodiments are merely some, but not all, embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
The terminology used in the embodiments of the utility model is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. As used in this application and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
It should be understood that the term "and/or" as used herein is merely one way of describing an association of associated objects, meaning that there may be three relationships, e.g., a and/or b, which may represent: the first and second cases exist separately, and the first and second cases exist separately. In addition, the character "/" herein generally indicates that the front and rear associated objects are an "or" relationship.
Depending on the context, the word "if" as used herein may be interpreted as "at … …" or "at … …" or "in response to a determination" or "in response to detection". Similarly, the phrase "if determined" or "if detected (stated condition or event)" may be interpreted as "when determined" or "in response to determination" or "when detected (stated condition or event)" or "in response to detection (stated condition or event), depending on the context.
Fig. 1 is a schematic structural diagram of an input voltage detection system according to an embodiment of the present utility model, as shown in fig. 1, the input voltage detection system includes: an input circuit 11, a transformer unit 12, an operational amplifier circuit 13, a sub controller 14, a main controller 15, and a fixing heating circuit 16. The input circuit 11 is connected to the transformer unit 12 and the fixing heating circuit 16. The transformer unit 12 is connected to an operational amplifier circuit 13. The operational amplifier circuit 13 is connected to the sub controller 14. The sub controller 14 is connected to the main controller 15 and the fixing heating circuit 16. The main controller 15 is connected to a fixing heating circuit 16. In an embodiment of the present utility model, the sub-controller 14 may include a microcontroller (Micro Control Unit, abbreviated as MCU), and the main controller 15 may include an SoC.
An input circuit 11 for acquiring an input voltage and converting the input voltage into a primary voltage. The transformer unit 12 outputs a secondary voltage according to the primary voltage. An operational amplifier circuit 13 for converting the secondary voltage into an operational voltage and transmitting the operational voltage to the sub-controller. The sub controller 14 is used for determining an input voltage according to the operation voltage and sending the input voltage to the main controller. A main controller 15 for judging whether or not there is an abnormality in the input voltage; if the input voltage is abnormal, the fixing heating circuit is determined to have an abnormal input voltage fault, the fixing heating circuit 16 is controlled to stop heating, and an input voltage abnormal signal is sent to the auxiliary controller, so that the auxiliary controller 14 controls the fixing heating circuit 16 to stop heating according to the input voltage abnormal signal. Wherein the input voltage is an alternating voltage.
In the embodiment of the present utility model, the main controller 15 is specifically configured to detect an input voltage, and generate an input voltage detection result; if the input voltage is detected to be abnormal, N input voltages are continuously detected, and if M abnormal results (N is more than or equal to M) exist in the continuous N input voltage detection results, the input voltage is indicated to be abnormal. (wherein, when M input voltage anomalies are detected, even if the number of detections is less than N, the input voltage detection is stopped, indicating that there is an anomaly in the input voltage), the fixing heating circuit 16 suffers from an input voltage anomaly fault; otherwise, it indicates that there is no abnormality in the input voltage, and specific values of the abnormal faults N and M of the input voltage that do not occur in the fixing heating circuit 16 may be set according to the actual requirements, which is not limited in the embodiment of the present utility model.
In the embodiment of the present utility model, after determining that the fixing heating circuit 16 has an abnormal input voltage fault, the main controller 15 reports the abnormal input voltage fault, generates an abnormal input voltage fault log, and stores the abnormal input voltage fault log in a Read-Only Memory (ROM). For the fixing heating circuit 16, the input voltage abnormality is not a fatal failure, and the user can repair the input voltage abnormality by restarting the image forming apparatus without maintenance by a maintenance person.
In the embodiment of the present utility model, the sub controller 14 is specifically configured to send the acquired model information of the image forming apparatus to the main controller 15 when the image forming apparatus is started up for self-checking; the main controller 15 is also used for receiving an electric signal which is sent by the main controller and indicates the corresponding relation between the model information and the input voltage; the input voltage is determined according to the correspondence relationship and transmitted to the main controller 15. Wherein, there are different correspondences between different model information and input voltage. If the model information is 110V model, the main controller 15 sends an electric signal of the corresponding relation between the 110V model and the input voltage to the auxiliary controller 14; if the model information is 220V model, the main controller 15 transmits an electric signal of the correspondence relationship between 220V model and input voltage to the sub controller 14.
In the embodiment of the present utility model, the sub controller 14 is specifically configured to obtain an operation voltage when the image forming apparatus is in an on state, determine an input voltage according to the operation voltage, and periodically send the input voltage to the main controller 15. The on state comprises a start-up preheating state, a dormancy awakening state, a standby state or a working preheating state.
In the embodiment of the utility model, the input voltage detection system further comprises a model detection circuit 17, and the model detection circuit 17 is connected with the auxiliary controller 14. The model detection circuit 17 is configured to identify model information of the image forming apparatus and transmit the model information to the sub-controller 14. The model information of the image forming device comprises 110V models or 220V models so as to adapt to the power grid voltages of different countries. The model detection circuit 16 detects the voltage/current of the branch circuit to determine the model information of the image forming apparatus.
In the embodiment of the present utility model, the input voltage detection system further includes a first rectifying and filtering circuit 18, and the first rectifying and filtering circuit 18 is electrically connected to the transformer unit 12 and the operational amplifier circuit 13. The first rectifying and filtering circuit 18 is used for converting the secondary voltage output by the transformer unit 12 into a direct current voltage.
In the embodiment of the utility model, the input voltage detection system further comprises a feedback circuit 19, a chip driving circuit 20 and a switch unit 21; the feedback circuit 19 is electrically connected to the first rectifying and filtering circuit 18 and the chip driving circuit 20, and the switching unit 21 is electrically connected to the chip driving circuit 20 and the transformer unit 12. The feedback circuit 19 is configured to transmit the dc voltage output from the first rectifying and filtering circuit 18 to the chip driving circuit 20. The chip driving circuit 20 is used for controlling the on and off of the switch unit 21. The switch unit 21 includes a Metal-Oxide-Semiconductor Field-Effect Transistor (MOS) transistor.
In the technical scheme provided by the embodiment of the utility model, when the main controller judges that the input voltage is abnormal, the fixing heating circuit is controlled to stop heating, an input voltage abnormal signal is sent to the auxiliary controller, and the auxiliary controller controls the fixing heating circuit to stop heating according to the input voltage abnormal signal. When the main controller detects that the input voltage is abnormal and stops working, if the input voltage is recovered to be normal, the main controller can recover to work without entering a fault mode to wait for maintenance, so that the use experience of a user is improved.
Fig. 2 is a schematic diagram of another input voltage detection system according to the present utility model, and as shown in fig. 2, the input voltage detection system includes an input circuit 11, a transformer unit 12, an operational amplifier circuit 13, a sub-controller 14, a main controller 15, a fixing heating circuit 16, a model detection circuit 17, a first rectifying and filtering circuit 18, a feedback circuit 19, a chip driving circuit 20, and a switching unit 21. Other matters related to the embodiments of the present utility model may be referred to the description of the above embodiments, and the description is not repeated here for the sake of brevity.
In the embodiment of the present utility model, the input circuit 11 includes an anti-surge circuit 111, an EMC filter circuit 112, and a second rectifying filter circuit 113; the anti-surge circuit 111 is connected to the EMC filter circuit 112, and the EMC filter circuit 112 is connected to the second rectifying filter circuit 113. The anti-surge circuit 111 is used for acquiring an input voltage and performing surge protection on the input voltage; the EMC filter circuit 112 is configured to EMC filter the input voltage output from the anti-surge circuit 111; the second rectifying and filtering circuit 113 is configured to rectify and filter the input voltage output by the EMC filtering circuit 112 to obtain a primary voltage.
In the embodiment of the present utility model, the transformer unit 12 includes a primary winding 121 (also referred to as a primary coil) and a secondary winding 122 (also referred to as a secondary coil), the primary winding 121 is connected to the second rectifying and filtering circuit 113 and the switching unit 21, and the secondary winding 122 is connected to the operational amplifier circuit 13 and the first rectifying and filtering circuit 18. The transformer unit 12 is used for outputting a secondary voltage according to the primary voltage.
In the embodiment of the present utility model, the fixing heating circuit 16 includes an input power source 161, a relay 162, a fixing heating device 163, and a silicon controlled rectifier 164. The input power source 161 is connected to the relay 162 and the anti-surge circuit 111, the relay 162 is connected to the fixing heating device 163, the sub controller 14, and the main controller 15, the fixing heating device 163 is connected to the thyristor 164, and the thyristor 164 is connected to the input power source 161, the sub controller 14, and the main controller 15. Wherein the relay 162 and the thyristor 164 are used to control on or off of the fixing heating circuit. The input power source 161 is used to power the input voltage detection system. The input power source 161 is a commercial power, and the commercial power voltage is an ac voltage of 110V or 220V. The fixing heating device 163 is used to heat the fixing unit. The fixing heating device 163 may be a halogen lamp or a ceramic fixing heating device, which is not limited in the embodiment of the present utility model.
In the embodiment of the present utility model, the main controller 15 is specifically configured to send out a relay shutdown signal, a thyristor shutdown signal, and an engine power supply shutdown signal to control the fixing heating circuit 16 to stop heating. The relay off signal is used for indicating the relay 162 to be turned off, the thyristor off signal is used for indicating the thyristor 164 to be turned off, and the engine power supply off signal is used for indicating the engine power supply to be turned off.
In the embodiment of the present utility model, the sub controller 14 is specifically configured to send a relay off signal and a thyristor off signal to control the fixing heating circuit 16 to stop heating. The relay off signal is used to instruct the relay 162 to turn off and the thyristor off signal is used to instruct the thyristor 164 to turn off.
Specifically, in the fixing heating circuit 16, the input power source 161, the relay 162, the fixing heating device 163, and the thyristor 164 constitute an ac circuit. When both the relay 162 and the thyristor 164 are turned on, the input power source 161 and the fixing heating device 163 are turned on, and the fixing heating circuit 16 is turned on; when the relay 162 and/or the thyristor 164 are turned off, the input power source 161 and the fixing heating device 163 are turned off, the fixing heating circuit 16 is turned off, and the fixing heating circuit 16 stops heating.
In the technical scheme provided by the embodiment of the utility model, when the main controller judges that the input voltage is abnormal, the fixing heating circuit is controlled to stop heating, an input voltage abnormal signal is sent to the auxiliary controller, and the auxiliary controller controls the fixing heating circuit to stop heating according to the input voltage abnormal signal. When the main controller detects that the input voltage is abnormal and stops working, if the input voltage is recovered to be normal, the main controller can recover to work without entering a fault mode to wait for maintenance, so that the use experience of a user is improved.
Fig. 3 is a schematic structural diagram of an image forming apparatus according to an embodiment of the present utility model, and as shown in fig. 3, the image forming apparatus includes an input voltage detection system. The input voltage detection system is the input voltage detection system described in the above embodiment, and the specific content thereof may be referred to the description of the above embodiment, and for brevity of description, the description will not be repeated here.
It will be clear to those skilled in the art that, for convenience and brevity of description, specific working procedures of the above-described systems, apparatuses and units may refer to corresponding procedures in the foregoing method embodiments, which are not repeated herein.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present utility model. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing specific logical functions or steps of the process, and additional implementations are included within the scope of the preferred embodiment of the present utility model in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order from that shown or discussed, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the embodiments of the present utility model.
Depending on the context, the word "if" as used herein may be interpreted as "at … …" or "at … …" or "in response to a determination" or "in response to detection". Similarly, the phrase "if determined" or "if detected (stated condition or event)" may be interpreted as "when determined" or "in response to determination" or "when detected (stated condition or event)" or "in response to detection (stated condition or event), depending on the context.
In the several embodiments provided by the present utility model, it should be understood that the disclosed systems and methods may be implemented in other ways. For example, the system embodiments described above are merely illustrative, e.g., the division of the elements is merely a logical functional division, and there may be additional divisions when actually implemented, e.g., multiple elements or components may be combined or integrated into another system, or some features may be omitted or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be an indirect coupling or communication connection via some interfaces, devices or units, which may be in electrical, mechanical or other form.
The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather to enable any modification, equivalent replacement, improvement or the like to be made within the spirit and principles of the utility model.
Claims (10)
1. An input voltage detection system, the input voltage detection system comprising:
the input circuit is used for acquiring an input voltage and converting the input voltage into a primary voltage;
a transformer unit for outputting a secondary voltage according to the primary voltage;
an operational amplifier circuit for converting the secondary voltage into an operational voltage and transmitting the operational voltage to a sub-controller;
the auxiliary controller is used for determining the input voltage according to the operation voltage and sending the input voltage to the main controller;
the main controller is used for judging whether the input voltage is abnormal or not; if the input voltage is abnormal, determining that the fixing heating circuit has an abnormal input voltage fault, controlling the fixing heating circuit to stop heating, and sending an abnormal input voltage signal to the auxiliary controller so that the auxiliary controller controls the fixing heating circuit to stop heating according to the abnormal input voltage signal.
2. The input voltage detection system of claim 1, wherein,
the input circuit is connected with the transformer unit and the fixing heating circuit;
the transformer unit is connected with the operational amplifier circuit;
the operational amplifier circuit is connected with the auxiliary controller;
the auxiliary controller is connected with the main controller and the fixing heating circuit;
the main controller is connected with the fixing heating circuit.
3. The input voltage detection system of claim 1, wherein,
the auxiliary controller is specifically used for sending the acquired model information of the image forming device to the main controller when the image forming device is started to perform self-checking; the system is also used for receiving an electric signal which is sent by the main controller and represents the corresponding relation between the model information and the input voltage; and determining the input voltage according to the corresponding relation, and sending the input voltage to a main controller.
4. The input voltage detection system of claim 1, wherein,
the auxiliary controller is specifically configured to acquire an operation voltage when the image forming apparatus is in an on state, determine the input voltage according to the operation voltage, and periodically send the input voltage to the main controller.
5. The input voltage detection system according to claim 1, wherein the fixing heating circuit includes a relay and a silicon controlled rectifier;
the main controller is specifically used for sending a relay turn-off signal, a silicon controlled rectifier turn-off signal and an engine power supply turn-off signal to control the fixing heating circuit to stop heating; the relay turn-off signal is used for indicating the relay to turn off, the silicon controlled rectifier turn-off signal is used for indicating the silicon controlled rectifier to turn off, and the engine power supply turn-off signal is used for indicating the engine power supply to turn off.
6. The input voltage detection system according to claim 1, wherein the fixing heating circuit includes a relay and a silicon controlled rectifier;
the auxiliary controller is specifically used for sending a relay turn-off signal and a silicon controlled rectifier turn-off signal to control the fixing heating circuit to stop heating; the relay turn-off signal is used for indicating the relay to turn off, and the silicon controlled turn-off signal is used for indicating the silicon controlled to turn off.
7. The input voltage detection system of claim 1, further comprising a model detection circuit connected to the secondary controller;
the model detection circuit is used for identifying model information of the image forming device and sending the model information to the auxiliary controller.
8. The input voltage detection system of claim 1, further comprising a first rectifying and filtering circuit electrically connected to the transformer unit and the operational amplifier circuit;
the first rectifying and filtering circuit is used for converting the secondary voltage output by the transformer unit into direct-current voltage.
9. The input voltage detection system of claim 8, further comprising a feedback circuit, a chip drive circuit, and a switching unit; the feedback circuit is electrically connected with the first rectifying and filtering circuit and the chip driving circuit, and the switch unit is electrically connected with the chip driving circuit and the transformer unit;
the feedback circuit is used for transmitting the direct-current voltage output by the first rectifying and filtering circuit to the chip driving circuit;
and the chip driving circuit is used for controlling the on and off of the switch unit.
10. An image forming apparatus, characterized in that the image forming apparatus includes the input voltage detection system according to any one of claims 1 to 9.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321371232.9U CN220064617U (en) | 2023-05-31 | 2023-05-31 | Input voltage detection system and image forming apparatus |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321371232.9U CN220064617U (en) | 2023-05-31 | 2023-05-31 | Input voltage detection system and image forming apparatus |
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| CN220064617U true CN220064617U (en) | 2023-11-21 |
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| CN202321371232.9U Active CN220064617U (en) | 2023-05-31 | 2023-05-31 | Input voltage detection system and image forming apparatus |
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