A printer circuit, control assembly and laser printer

Abstract

The utility model provides a kind of printer circuit, control component and laser printer, including main control board, high voltage plate and feedback circuit main control board is electrically connected with high voltage plate, to control the output voltage of high voltage plate.Feedback circuit includes current acquisition unit and voltage acquisition unit;Current acquisition unit is electrically connected with high voltage plate, for the current signal of acquisition high voltage plate;The acquisition end of voltage acquisition unit is electrically connected with high voltage plate, for the voltage signal of acquisition high voltage plate;Main control board is also electrically connected with current acquisition unit, voltage acquisition unit respectively, for according to current signal and voltage signal control the output voltage of high voltage plate.The printer circuit of the application embodiment can form double closed loop control loop with main control board, high voltage plate, to help guarantee the working stability of photoconductor connected by high voltage plate, can promote printing quality.

Description

Technical Field

[0001] This utility model relates to the field of laser printers, and in particular to a printer circuit, control component, and laser printer. Background Technology

[0002] The circuitry of a laser printer mainly consists of a low-voltage control circuit and a high-voltage drive circuit. The low-voltage control circuit typically transmits low-voltage signals such as 5V or 24V in the form of a main control board, while the high-voltage drive circuit typically outputs high-voltage signals of thousands of volts in the form of a high-voltage board. The main control board and the high-voltage board are electrically connected together, and the high-voltage board is also electrically connected to photoconductors such as the charging roller, developing roller, and transfer roller. The main control board sends low-voltage control signals to the high-voltage board, enabling the high-voltage board to charge these photoconductors.

[0003] However, laser printers often cannot accurately determine whether the high-voltage signal output by the high-voltage board meets the set parameters. If the high-voltage signal does not meet the set parameters, it will cause the corresponding photoconductor to be unstable, resulting in defects such as inconsistent color depth, blurring and ghosting in the printed results output by the photoconductor, and thus low print quality. Utility Model Content

[0004] In view of the above problems, a printer circuit, control component and laser printer are proposed to overcome or at least partially solve the above problems, so as to solve the problem of low print quality.

[0005] To address the aforementioned problems, this utility model discloses a printer circuit, including a main control board, a high-voltage board, and a feedback circuit.

[0006] The main control board is electrically connected to the high-voltage board to control the output voltage of the high-voltage board;

[0007] The current acquisition unit of the feedback circuit is electrically connected to the high-voltage board and is used to acquire the current signal of the high-voltage board.

[0008] The voltage acquisition unit of the feedback circuit is electrically connected to the high-voltage board and is used to acquire the voltage signal of the high-voltage board.

[0009] The main control board is also electrically connected to the current acquisition unit and the voltage acquisition unit, respectively, and is used to control the output voltage of the high voltage board according to the current signal and the voltage signal.

[0010] Optionally, the printer circuit further includes a signal isolation device;

[0011] The signal isolation device is electrically connected to the circuit on which the main control board controls the high-voltage board, and is used to control the electrical isolation between the main control board and the high-voltage board.

[0012] Optionally, the signal isolation device includes a latch or an optocoupler.

[0013] Optionally, when the signal isolation device is a latch, it includes a control signal input pin, a control signal output pin, an enable signal input pin, and an enable signal output pin;

[0014] The control signal input pin and the control signal output pin are located on the gate circuit within the latch. The control signal input pin is electrically connected to the main control board, and the control signal output pin is electrically connected to the high-voltage board.

[0015] The enable signal input pin and the enable signal output pin are located on the gate circuit within the latch. The enable signal input pin is electrically connected to the main control board, and the enable signal output pin is electrically connected to the high-voltage board.

[0016] Optionally, the current acquisition unit includes a main current conductor and a linear Hall circuit;

[0017] The two ends of the main current conductor form the acquisition terminals of the current acquisition unit, and the main current conductor is connected in series with the high voltage busbar of the high voltage board;

[0018] The linear Hall circuit is located within the magnetic field region of the main current conductor and is electrically connected to the main control board to transmit the induced voltage signal to the main control board.

[0019] Optionally, the linear Hall circuit includes: a linear Hall device, an amplifier circuit and a temperature compensation circuit electrically connected to the linear Hall device, and a dynamic offset elimination circuit electrically connected to the amplifier circuit.

[0020] Optionally, the voltage acquisition unit is a voltage follower.

[0021] This utility model embodiment also discloses a control component for a laser printer, the control component including any of the aforementioned printer circuits;

[0022] The feedback circuit is integrated on the main control board or the high voltage board; or, the feedback circuit is located on a separate board.

[0023] This utility model also discloses a laser printer, which includes the aforementioned control components.

[0024] Optionally, the laser printer further includes a charging roller, a developing roller, and a transfer roller;

[0025] The high-voltage plate includes a first high-voltage busbar electrically connected to the charging roller, a second high-voltage busbar electrically connected to the developing roller, and a third high-voltage busbar electrically connected to the transfer roller.

[0026] The current acquisition unit includes a first current acquisition unit, a second current acquisition unit, and a third current acquisition unit; the voltage acquisition unit includes a first voltage acquisition unit, a second voltage acquisition unit, and a third voltage acquisition unit.

[0027] Both the first current acquisition unit and the first voltage acquisition unit are electrically connected to the first high-voltage busbar;

[0028] Both the second current acquisition unit and the second voltage acquisition unit are electrically connected to the second high-voltage busbar;

[0029] Both the third current acquisition unit and the third voltage acquisition unit are electrically connected to the third high-voltage bus.

[0030] The embodiments of this utility model have the following advantages:

[0031] The printer circuit of this embodiment can feed back the current and voltage signals output by the high-voltage board to the main control board through a current acquisition unit and a voltage acquisition unit, respectively. The main control board can adjust these two parameters, ensuring that the high-voltage signal output by the high-voltage board is within the parameter range set by the printer. The printer circuit of this embodiment can form a double closed-loop control circuit with the main control board and the high-voltage board, thereby helping to ensure the working stability of the photoconductor connected to the high-voltage board and thus improving print quality. Attached Figure Description

[0032] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. In the drawings:

[0033] Figure 1 This is a schematic diagram of the topology of the first printer circuit of this utility model;

[0034] Figure 2 This is a schematic diagram of the topology of the second type of printer circuit of this utility model;

[0035] Figure 3 This is a schematic diagram of the circuit principle of a latch according to this utility model;

[0036] Figure 4 This is a schematic diagram of the topology of a current acquisition unit according to this utility model;

[0037] Figure 5This is a circuit diagram of a voltage acquisition unit according to the present invention;

[0038] Figure 6 This is a schematic diagram of the circuit principle of a laser printer according to this utility model.

[0039] Explanation of reference numerals in the attached figures:

[0040] 10. Feedback circuit; 101. Current acquisition unit; 101a. First current acquisition unit; 101b. Second current acquisition unit; 101c. Third current acquisition unit; 1011. Main current conductor; 1012. Linear Hall effect circuit; 102. Voltage acquisition unit; 102a. First voltage acquisition unit; 102b. Second voltage acquisition unit; 102c. Third voltage acquisition unit; 11. Signal isolation device; 11a. Control signal input pin; 11b. Control signal output pin; 11c. Enable signal input pin; 11d. Enable signal output pin;

[0041] 20. Main control board;

[0042] 30. High-voltage board; 301. First high-voltage busbar; 302. First high-voltage busbar; 303. First high-voltage busbar;

[0043] 40. Charging roller;

[0044] 50. Developing roller;

[0045] 60. Transfer roller. Detailed Implementation

[0046] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0047] To address the problem of low print quality caused by the inability to accurately determine whether the high-voltage signal output by the high-voltage board meets the set parameters in laser printer circuits, this application provides a circuit for printers. The circuit includes a main control board, a high-voltage board, and a feedback circuit. This feedback circuit can collect the high-voltage signal output by the high-voltage board and transmit it to the main control board. The main control board compares the signal with the set parameter range and then adjusts the high-voltage signal of the high-voltage board as needed based on the comparison result to ensure that it meets the set parameters.

[0048] like Figure 1The diagram illustrates the connection topology of the feedback circuit 10 with the main control board 20 and high-voltage board 30 in the laser printer according to an embodiment of this utility model. The main control board 20 in this embodiment refers to a control circuit board with a processor as its core, and equipped with functional units such as memory, reset circuit, and switching power supply. This control circuit board also has interfaces for connecting to external computer equipment, interfaces for connecting to the laser assembly, and interfaces for connecting to the high-voltage board 30. The high-voltage board 30 refers to a power supply board that can boost a 24V low-voltage power supply to a high-voltage power supply of thousands of volts and supply this high-voltage power to the photoconductor of the laser printer.

[0049] The feedback circuit 10 includes a current acquisition unit 101 and a voltage acquisition unit 102. The current acquisition unit 101 has an acquisition terminal and an output terminal. The acquisition terminal of the current acquisition unit 101 is electrically connected to the high-voltage board 30, and the output terminal of the current acquisition unit 101 is electrically connected to the main control board 20. The current acquisition unit 101 can transmit the current signal corresponding to the high-voltage signal output by the high-voltage board 30 to the main control board 20, allowing the main control board 20 to monitor whether the current signal corresponding to the current high-voltage signal meets the set parameter range.

[0050] The voltage acquisition unit 102 also has an acquisition end and an output end. The acquisition end of the voltage acquisition unit 102 is electrically connected to the high-voltage board 30, and the output end of the voltage acquisition unit 102 is electrically connected to the main control board 20. The voltage acquisition unit 102 can transmit the high-voltage signal output by the high-voltage board 30 to the main control board 20, so that the main control board 20 can monitor whether the current high-voltage signal meets the set parameter range.

[0051] Therefore, in this embodiment of the application, the feedback circuit can feed back the current signal and voltage signal output by the high-voltage board to the main control board 20 through the current acquisition unit 101 and the voltage acquisition unit 102, respectively. The main control board 20 can adjust the output high-voltage signal of the high-voltage board 30 according to these two parameters to keep it within the set parameter range. The feedback circuit of this embodiment of the application can form a double closed-loop control circuit with the main control board 20 and the high-voltage board 30, thereby helping to ensure the working stability of the photoconductor connected to the high-voltage board 30 and improving the printing quality.

[0052] Alternatively, in one implementation, such as Figure 2 As shown, the printer circuit in this embodiment of the application also includes a signal isolation device 11. The signal isolation device is electrically connected to the circuit of the main control board controlling the high voltage board.

[0053] Since the signal isolation device 11 can electrically isolate the main control board 20 and the high-voltage board 30, it can prevent damage to the main control board 20 caused by accidental reverse transmission of the high-voltage signal from the high-voltage board 30 when the main control board 20 and the high-voltage board 30 are directly electrically connected. It should be noted that the electrical isolation function of the signal isolation device 11 is to isolate the transmission of high-voltage signals and transmit the low-voltage control signals of the main control board 20 to the high-voltage board 30, so as to realize the control and regulation of the high-voltage board 30.

[0054] Alternatively, in one embodiment, the aforementioned signal isolation device 11 can be implemented using a latch or an optocoupler to achieve signal isolation.

[0055] A latch is a level-sensitive storage unit circuit that temporarily stores one bit of binary data in a digital circuit. Latches can be implemented using various digital logic gates (such as AND gates, OR gates, NOT gates, NAND gates, and NOR gates). Their core characteristic is level triggering; when the latch pin is active, the input and output of the latch are directly connected, and the output state changes with the input signal. When the latch pin is inactive, its output state is locked until the latch pin is active again to release the latch. For example, a high level on the latch pin indicates that the input and output of the latch are directly connected, and a low level indicates that the latch is latched. The output data of the latch can be controlled by controlling the latch pin. In the feedback circuit of this embodiment, when the main control board 20 needs to transmit a low-voltage control signal to the high-voltage board 30, the level signal of the latch pin can be controlled to make the input and output of the latch directly connected, so that the low-voltage control signal output by the main control board 20 is directly transmitted to the high-voltage board 30. When it is necessary to block the high-voltage signal from the high-voltage board 30, the level signal of the control latch pin is adjusted to put the latch in a latched state. At this time, the main control board 20 and the high-voltage board 30 cannot transmit signals temporarily, that is, the high-voltage signal output by the high-voltage board 30 cannot be transmitted to the main control board 20, thus achieving electrical isolation between the high-voltage board 30 and the main control board 20. The optocoupler achieves electrical isolation between circuits through light-emitting diodes (such as LEDs) and photosensitive elements (such as photodiodes, phototransistors, etc.). For the feedback circuit of this embodiment, for example, the main control board 20 can be electrically connected to the light-emitting diode of the optocoupler, and the high-voltage board 30 can be electrically connected to the photosensitive element of the optocoupler. The high-voltage board 30 can sense the light signal as an electrical signal and normally receive the low-voltage control signal output by the main control board 20, but it cannot transmit the high-voltage signal output by the high-voltage board 30 back to the control board 20, thus achieving electrical isolation between the main control board 20 and the high-voltage board 30.

[0056] In addition, it should be noted that regardless of whether the signal isolation device 11 uses an optocoupler or a latch, compared to directly connecting the main control board 20 and the high voltage board 30, once a circuit failure occurs, the high voltage signal of the high voltage board 30 will be transmitted in reverse, and the signal isolation device 11 will be damaged before the main control board 20, thus providing physical protection for the main control board 20.

[0057] Alternatively, in one implementation, such as Figure 2 As shown, when the signal isolation device 11 is a latch, the signal isolation device 11 includes a control signal input pin 11a, a control signal output pin 11b, an enable signal input pin 11c, and an enable signal output pin 11d.

[0058] The control signal input pin 103a and the control signal output pin 103b are connected to the gate circuit inside the latch. Under the action of the latch pin and the gate circuit, the pass-through or latching between the control signal input pin 11a and the control signal output pin 11b can be realized.

[0059] The enable signal input pin 11c and enable signal output pin 11d are connected to the gate circuit inside the latch. Under the action of the latch pin and the gate circuit, the enable signal input pin 11c and enable signal output pin 11d can be directly connected or latched.

[0060] Referring to the foregoing embodiments, when the latch is in a pass-through state controlled by the high or low level of the latch pin, both the control signal input pin 11a and the control signal output pin 11b, as well as the enable signal input pin 11c and the enable signal output pin 11d, are in a pass-through state. When the latch is in a latched state controlled by the high or low level of the latch pin, the level signal of the control signal output pin 11b is the same as the level signal of the control signal input pin 11a before latching, and the level signal of the enable signal output pin 11d is the same as the level signal of the enable signal input pin 11c before latching. Furthermore, the control signal output pin 11b and enable signal output pin 11d are also used for electrical connection with the high-voltage board 30. When the latch is in the pass-through state, the main control board 20 can transmit the control signal to the high-voltage board 30 through the control signal input pin 11a and the enable signal input pin 11c, and transmit the enable signal to the high-voltage board 30 through the enable signal output pin 11d, thereby controlling the high-voltage board 30 to output the corresponding high-voltage signal. For example, the high-voltage board 30 is provided with a boost circuit to boost the external low-voltage power supply, which can boost the lower 24V low-voltage signal to a high-voltage signal of several thousand volts. In this boost circuit, the primary winding of the transformer is connected to the external low-voltage power supply, the secondary winding is used to output the high-voltage signal, and the input line of the low-voltage power supply is provided with a switching device (e.g., a MOSFET). The enable signal output pin 11d can be connected to the gate of the switching device, and the enable signal transmitted by the enable signal output pin 11d can control the on / off state of the low-voltage power supply. The primary winding of the transformer also contains another switching device (e.g., a MOSFET). The control signal output pin 11b can be connected to the gate of this switching device. The control signal transmitted through the control signal output pin 11b can control the transformer's boost function to be turned on or off. Specifically, Figure 3 The circuit structure between signal input pin 1D and signal output pin 1C in the latch is also illustrated. Signal input pin 1D can represent control signal input pin 11a or enable signal input pin 11c. Signal output pin 1C can represent control signal output pin 11b or enable signal output pin 11d. LE represents the latch pin, i.e. the latch enable terminal, which is used to control the latch to be in latched state or pass-through state. It can be triggered by a high level. OE represents the output enable terminal, which can be triggered by a low level. Its truth table is shown in Table 1 below.

[0061] Table 1 Truth Table of Latch Input-Output Relationships

[0062]

[0063] As can be seen from the truth table above, when pin OE is high, all signal output pins 1C are in a high configuration. At this time, the latch cannot be controlled. Therefore, pin OE is usually grounded to keep the pin in an enabled state.

[0064] When pin OE is low and pin LE is high, the signal output pin 1C and the signal input pin 1D maintain the same level, enabling direct output.

[0065] When pin OE is low and pin LE is low, regardless of the level of signal input pin 1D, signal output pin 1C will retain the previous data state, i.e., latch state.

[0066] Understandably, when multiple signals need to be transmitted, multiple latches can be configured. Figure 3 The circuit shown extends externally from the latch to form multiple input / output pins, thus constituting a signal isolation device 11. For example, two such pins can be configured inside the latch. Figure 3 In the circuit shown, one signal input pin 1D can represent the control signal input pin 11a, another signal input pin 1D can represent the enable signal input pin 11c, one signal output pin 1C can represent the control signal output pin 11b, and another signal output pin 1C can represent the enable signal output pin 11d.

[0067] Alternatively, in one implementation, such as Figure 4 As shown, the current acquisition unit 101 includes a main current conductor 1011 and a linear Hall circuit 1012.

[0068] One end of the main current conductor 1011 serves as the current inflow terminal of the current acquisition unit 101, and the other end serves as the current outflow terminal. Both the current inflow and outflow terminals act as the acquisition terminals of the current acquisition unit 101, acquiring the current signal from the high-voltage bus. The main current conductor 1011 can be connected in series to the high-voltage bus of the high-voltage board 30 via its current inflow and outflow terminals. The high-voltage bus is the conductor on the high-voltage board 30 that transmits the high-voltage signal to the photoconductor of the printer. During the transmission of the high-voltage signal to the photoconductor, the main current conductor 1011 can acquire the corresponding current signal through the high-voltage bus.

[0069] Since the linear Hall circuit 1012 is located within the magnetic field region of the main current conductor 1011 and is electrically connected to the main control board 20, the linear Hall circuit 1012 can generate a corresponding voltage signal under the excitation of the magnetic field generated by the main current conductor 1011, and transmit the voltage signal to the main control board 20 for analysis and processing.

[0070] Therefore, by utilizing the characteristics of the linear Hall circuit in this embodiment, the current signal from the high-voltage board 30 can be converted into a voltage signal that can be analyzed and processed by the main control board 20.

[0071] Alternatively, in one implementation, such as Figure 4 As shown, the linear Hall circuit 1012 of this application embodiment includes a linear Hall device 10121, an amplifier circuit 12122 and a temperature compensation circuit 10124 electrically connected to the linear Hall device 10121, and a dynamic offset cancellation circuit 10123 electrically connected to the amplifier circuit 10122. In other words, the linear Hall circuit 1012 used in this application embodiment, in addition to having basic current acquisition functions, can amplify the voltage signal generated by the linear Hall device 10121 through the internally integrated amplifier circuit 12122, correct the amplified offset voltage through the comparator in the dynamic offset cancellation circuit 10123, and compensate for the result drift caused by temperature factors through the temperature compensation circuit 10124. Therefore, the linear Hall circuit 1012 of this application embodiment has higher output accuracy and precision.

[0072] Optionally, in one embodiment, the voltage acquisition unit 102 is a voltage follower. For example... Figure 5 As shown, the voltage follower is an operational amplifier circuit with a gain of 1 and a high input impedance. Its output voltage is the same as its input voltage, and it consumes less current. Therefore, it has virtually no impact on the high-voltage signal transmission of the high-voltage board 30 itself.

[0073] This utility model embodiment also discloses a control component for a laser printer, which is the circuit part used to control the operation of the mechanical structure of the laser printer, specifically including any of the aforementioned feedback circuits 10.

[0074] In some implementations, the feedback circuit 10 may be integrated on the main control board 20 or the high-voltage board 30. It is understood that this product form is designed for newly developed and manufactured printers, that is, for the complete update and upgrade of the control components of laser printers.

[0075] In other embodiments, the feedback circuit 10 can be located on a separate board. This separate board can serve as an upgrade module for upgrading older printers that have already been manufactured or sold. Simply install the separate board into the older printer and connect the feedback circuit 10 to the main control board 20 and the high-voltage board 30 accordingly. This upgrade method is less costly and helps avoid leaving older printers idle and wasted.

[0076] This utility model also discloses a laser printer, which includes the aforementioned control components. By configuring and using the aforementioned control components in the laser printer, the output quality of the printer can be significantly improved.

[0077] Alternatively, in one implementation, such as Figure 6As shown, taking the feedback circuit 10 as an example, which is set on an independent board, the independent board corresponding to the feedback circuit 10 can be plugged into the main control board 20 and the high-voltage board 30 respectively through a multi-pin connector. The laser printer also includes a charging roller 40, a developing roller 50, and a transfer roller 60. The high-voltage board 30 includes a first high-voltage bus 301 electrically connected to the charging roller 40, a second high-voltage bus 302 electrically connected to the developing roller 50, and a third high-voltage bus 303 electrically connected to the transfer roller 60. Each high-voltage bus is connected to a boost circuit that can boost the voltage of an external 24V power supply. The high-voltage signal output by the boost circuit is the high-voltage signal transmitted by the high-voltage bus, which is also the high-voltage signal required for the operation of the corresponding roller. The boosting process of this boost circuit is controlled by the main control board 20. Specifically, it can be seen as follows: Figure 6 As shown, the signal isolation device 103 transmits the control signal and enable signal to the boost circuit to adjust the output value of the high voltage signal. The charging roller 40, developing roller 50, and transfer roller 60 each complete the corresponding work of charging, developing, and transferring during the printing process. The high voltage signals on these three photoconductors will affect the output quality of the printer.

[0078] Therefore, in order to ensure that the high-voltage signal on each photoconductor remains stably and reliably within the set parameter range, each photoconductor is equipped with the aforementioned feedback circuit. Combined with... Figure 6 As shown, the details are as follows:

[0079] The current acquisition unit includes a first current acquisition unit 101a, a second current acquisition unit 101b, and a third current acquisition unit 101c. The voltage acquisition unit includes a first voltage acquisition unit 102a, a second voltage acquisition unit 102b, and a third voltage acquisition unit 102c. The acquisition terminals of the first current acquisition unit 101a and the first voltage acquisition unit 102a are electrically connected to the first high-voltage bus 301. The acquisition terminals of the second current acquisition unit 101b and the second voltage acquisition unit 102b are electrically connected to the second high-voltage bus 302. The acquisition terminals of the third current acquisition unit 101c and the third voltage acquisition unit 102c are electrically connected to the third high-voltage bus 303. It should be noted that in this embodiment, the acquisition terminals of any current acquisition unit, i.e., its current inflow and current outflow terminals, are connected to the high-voltage bus. Therefore, when the current flows through the high-voltage bus, it also flows through the corresponding current acquisition unit.

[0080] Combination Figure 6 As illustrated, the high-voltage signals transmitted by the high-voltage board 30 to the corresponding photoconductors via the high-voltage busbar can be collected by the corresponding current acquisition units 101a~101c and voltage acquisition units 102a~102c, and then analyzed and processed by the main control board 20 to adjust the high-voltage signal of each channel.

[0081] Therefore, the feedback circuit 10 enables the main control board 20 to adjust the current signal and voltage signal respectively, so that the high voltage signals required for the operation of the charging roller 40, developing roller 50 and transfer roller 60 can be maintained within the parameter range set by the high voltage board 30, thereby improving the printing quality of the laser printer.

[0082] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0083] Those skilled in the art will understand that although preferred embodiments of the present invention have been described, those skilled in the art, once they learn the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of the present invention.

[0084] Finally, it should be noted that in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or terminal device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or terminal device. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or terminal device that includes said element.

[0085] The present invention provides a detailed description of a printer circuit, control component, and laser printer. Specific examples have been used to illustrate the principles and implementation methods of the present invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of the present invention. At the same time, those skilled in the art will recognize that there will be changes in the specific implementation methods and application scope based on the ideas of the present invention. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A printer circuit, characterized in that, Includes the main control board, high voltage board, and feedback circuit; The main control board is electrically connected to the high-voltage board to control the output voltage of the high-voltage board; The current acquisition unit of the feedback circuit is electrically connected to the high-voltage board and is used to acquire the current signal of the high-voltage board. The voltage acquisition unit of the feedback circuit is electrically connected to the high-voltage board and is used to acquire the voltage signal of the high-voltage board. The main control board is also electrically connected to the current acquisition unit and the voltage acquisition unit, respectively, and is used to control the output voltage of the high voltage board according to the current signal and the voltage signal.

2. The printer circuit according to claim 1, characterized in that, The printer circuit also includes a signal isolation device; The signal isolation device is electrically connected to the circuit on which the main control board controls the high-voltage board, and is used to control the electrical isolation between the main control board and the high-voltage board.

3. The printer circuit according to claim 2, characterized in that, The signal isolation device includes a latch or an optocoupler.

4. The printer circuit according to claim 3, characterized in that, When the signal isolation device is a latch, it includes a control signal input pin, a control signal output pin, an enable signal input pin, and an enable signal output pin; The control signal input pin and the control signal output pin are located on the gate circuit within the latch; the control signal input pin is electrically connected to the main control board, and the control signal output pin is electrically connected to the high-voltage board. The enable signal input pin and the enable signal output pin are located on the gate circuit within the latch. The enable signal input pin is electrically connected to the main control board, and the enable signal output pin is electrically connected to the high-voltage board.

5. The printer circuit according to claim 1, characterized in that, The current acquisition unit includes a main current conductor and a linear Hall circuit; The two ends of the main current conductor are respectively connected in series on the high voltage busbar of the high voltage plate; The linear Hall circuit is located within the magnetic field region of the main current conductor and is electrically connected to the main control board to transmit the induced voltage signal to the main control board.

6. The printer circuit according to claim 5, characterized in that, The linear Hall circuit includes: a linear Hall device, an amplifier circuit and a temperature compensation circuit electrically connected to the linear Hall device, and a dynamic offset elimination circuit electrically connected to the amplifier circuit.

7. The printer circuit according to claim 1, characterized in that, The voltage acquisition unit is a voltage follower.

8. A control component for a laser printer, characterized in that, The control component includes the printer circuit according to any one of claims 1 to 7; The feedback circuit is integrated on the main control board or the high voltage board; or, the feedback circuit is set on a separate board.

9. A laser printer, characterized in that, The laser printer includes the control component as described in claim 8.

10. The laser printer according to claim 9, characterized in that, The laser printer also includes a charging roller, a developing roller, and a transfer roller; The high-voltage plate includes a first high-voltage busbar electrically connected to the charging roller, a second high-voltage busbar electrically connected to the developing roller, and a third high-voltage busbar electrically connected to the transfer roller. The current acquisition unit includes a first current acquisition unit, a second current acquisition unit, and a third current acquisition unit; the voltage acquisition unit includes a first voltage acquisition unit, a second voltage acquisition unit, and a third voltage acquisition unit. The first current acquisition unit and the first voltage acquisition unit are both electrically connected to the first high-voltage bus; the second current acquisition unit and the second voltage acquisition unit are both electrically connected to the second high-voltage bus; the third current acquisition unit and the third voltage acquisition unit are both electrically connected to the third high-voltage bus.

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