Cleaning voltage control circuit, high voltage board and electronic device

Abstract

The embodiment of the present application provides a cleaning voltage control circuit, a high-voltage plate and electronic equipment. The cleaning voltage control circuit comprises a generation module, a detection module and a protection module. The generation module is used for generating a cleaning voltage according to a control signal of a control module. The cleaning voltage is used for cleaning toner on a transfer body and / or a photoreceptor. The detection module is used for detecting whether the working duration of the generation module exceeds a set duration. The protection module is used for performing protection on the generation module when the working duration exceeds the set duration. The present application detects whether the working duration of the generation module exceeds the set duration, that is, the duration of the cleaning voltage, through the detection module. If the set duration is exceeded, the protection module performs protection on the generation module. The detection module timely identifies the abnormal state of the cleaning voltage and performs protection, thereby avoiding the problems of over-stress of a triode switch and abnormal consumption of toner caused by the abnormal cleaning voltage.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electronic imaging, in particular to a cleaning voltage control circuit, a high-voltage plate and an electronic device. BACKGROUND

[0002] In the high-voltage imaging technology, the transfer high-voltage includes transfer positive high-voltage and transfer negative high-voltage, and the transfer negative high-voltage is also called cleaning voltage, which is collectively referred to as cleaning voltage below. The transfer positive voltage is used to adsorb carbon powder from the surface of an organic photoconductor (OPC) to a paper by electric field force. The cleaning voltage plays a role in cleaning the carbon powder scattered on the transfer roller and the residual carbon powder on the surface of the organic photoconductor. In terms of timing control, the cleaning voltage is often only turned on in the stage before paper feeding and after paper ejection (the on timing is controlled by firmware through an interface), and there are few use scenarios of continuous action. Secondly, when the printer is preheating and supplying powder, the cleaning negative voltage is also continuously turned on.

[0003] If the cleaning voltage is in an abnormal state, the triode transformer in the cleaning voltage generation loop will have a high temperature rise in timing control, and in severe cases, the triode switching element will be overstressed, reducing the service life of the element. If the cleaning voltage is abnormal when preheating and supplying powder, it will cause long-time powder supply during the preheating stage. Long-time powder supply in an abnormal state will cause a large amount of ink powder consumption in the printer, the ink powder in the powder box cannot be filled, resulting in ink powder waste and an increase in user use cost.

[0004] Therefore, there is an urgent need for a circuit that can identify the abnormal state of the cleaning voltage in a timely manner. SUMMARY

[0005] The embodiments of the present application provide a cleaning voltage control circuit, a high-voltage plate and an electronic device, which can identify the abnormal state of the cleaning voltage in a timely manner and perform protection.

[0006] In a first aspect, the embodiments of the present application provide a cleaning voltage control circuit, which includes a generation module, a detection module and a protection module.

[0007] The generation module is configured to generate a cleaning voltage according to a control signal of the control module; the cleaning voltage is used to clean toner on a transfer body and / or a photosensitive body;

[0008] The detection module is configured to detect whether a working duration of the generation module exceeds a set duration;

[0009] The protection module is configured to perform protection on the generation module when the working duration exceeds the set duration.

[0010] In one of the embodiments, the protection module is further configured to send a first signal to the control module when the working duration exceeds the set duration; the first signal is used to represent that the generation module works abnormally.

[0011] The control module is further configured to reset the generation module and / or output error information.

[0012] In one of the embodiments, the detection module comprises a charging unit and a detection unit.

[0013] The charging unit is configured to charge when the generation module starts to generate the cleaning voltage; and a charging cutoff duration of the charging unit is equal to the set duration.

[0014] The detection unit is configured to determine whether the working duration exceeds the set duration based on a voltage of the charging unit, and send a second signal to the protection module when the working duration exceeds the set duration; the second signal represents that the working duration exceeds the set duration.

[0015] In one of the embodiments, the charging unit comprises a switching subunit and a charging subunit.

[0016] The switching subunit is configured to turn on a charging path of the charging subunit when the generation module starts to generate the cleaning voltage.

[0017] In one of the embodiments, the charging unit further comprises a discharging subunit.

[0018] The discharging subunit is configured to perform a discharging operation on the charging subunit when the charging path of the charging subunit is disconnected.

[0019] In one of the embodiments, the switching subunit comprises a first switch.

[0020] A first end of the first switch is connected with an output end of the control module, a second end of the first switch is grounded, and a third end of the first switch is connected with a first power supply end.

[0021] In one of the embodiments, the switching subunit further comprises at least one resistor selected from a first resistor, a second resistor and a third resistor.

[0022] The first end of the first switch is connected with the output end of the control module through the first resistor.

[0023] The first end of the first switch is further grounded through the second resistor.

[0024] The third end of the first switch is connected with the first power supply end through the third resistor.

[0025] In one of the embodiments, the charging subunit comprises a fourth resistor and a first capacitor.

[0026] A first end of the fourth resistor is connected with the third end of the first switch, a second end of the fourth resistor is connected with a first end of the first capacitor, and a second end of the first capacitor is grounded.

[0027] The first switch is in an off state when the control module controls the generating module to start generating the cleaning voltage, so as to turn on a charging path between the first power supply end and the first capacitor, and a charging cutoff time length of the first capacitor is less than or equal to a set time length.

[0028] In one of the embodiments, the charging subunit further comprises a first diode.

[0029] The anode of the first diode is connected with the second end of the first switch, and the cathode of the first diode is connected with the first end of the fourth resistor.

[0030] In one of the embodiments, the discharging subunit comprises a second diode and a fifth resistor.

[0031] The anode of the second diode is connected with the first end of the first capacitor, the cathode of the second diode is connected with the first end of the fifth resistor, and the second end of the fifth resistor is connected with the third end of the first switch.

[0032] The first switch is in an on state when the generating module stops generating the cleaning voltage, so as to turn on a discharging path of the first capacitor.

[0033] In one of the embodiments, the resistance value of the fifth resistor is less than the resistance value of the fourth resistor.

[0034] In one of the embodiments, the detecting subunit comprises a comparator.

[0035] The first input end of the comparator is connected with the reference voltage providing end, the second input end of the comparator is connected with the first end of the first capacitor, and the output end of the comparator is connected with the input end of the protection module.

[0036] The comparator is configured to send a second signal to the protection module when the voltage of the first capacitor is greater than a reference voltage, and the voltage value of the reference voltage is related to the set time length.

[0037] In one of the embodiments, the detecting subunit further comprises a sixth resistor and a seventh resistor.

[0038] The first end of the sixth resistor is connected with the first power supply end, the second end of the sixth resistor is connected with the first input end of the comparator and the first end of the seventh resistor respectively, and the second end of the seventh resistor is grounded.

[0039] In one of the embodiments, the protection module comprises a second switch.

[0040] The first end of the second switch is connected with the detecting module, the second end of the second switch is grounded, and the third end of the second switch is connected with the second power supply end and the generating module respectively.

[0041] The second switch is configured to send a first signal to the generating module when the working time length exceeds the set time length, so that the generating module performs self-protection.

[0042] In one of the embodiments, the generating module comprises: an initial voltage generating unit, a generating control unit, and a generating unit.

[0043] The initial voltage generating unit is configured to generate an initial cleaning voltage.

[0044] The generating control unit is configured to control the generating unit to generate a cleaning voltage based on the initial cleaning voltage based on a control instruction of the control module.

[0045] The third end of the second switch is connected with the generating control unit, and the generating control unit is further configured to control the generating unit to stop generating the cleaning voltage based on the first signal.

[0046] In one of the embodiments, the protection module further comprises at least one of the following: an eighth resistor, a ninth resistor, and an RC filter unit.

[0047] The first end of the eighth resistor is connected with the output end of the detection module, and the second end of the eighth resistor is connected with the first end of the second switch.

[0048] The first end of the ninth resistor is connected with the second power supply end, and the second end of the ninth resistor is connected with the third end of the second switch.

[0049] The RC filter unit comprises: a tenth resistor and a second capacitor; the first end of the tenth resistor and the first end of the second capacitor are both connected with the first end of the second switch, and the second end of the tenth resistor and the second end of the second capacitor are both grounded.

[0050] In the second aspect, the embodiments of the present application provide a high-voltage plate comprising the cleaning voltage control circuit as described above.

[0051] In the third aspect, the embodiments of the present application provide an electronic device comprising the high-voltage plate and the control module as described above.

[0052] The cleaning voltage control circuit, the high-voltage plate, and the electronic device provided by the embodiments of the present application comprise: a generating module, a detection module, and a protection module; the generating module is configured to generate a cleaning voltage according to a control signal of a control module; the cleaning voltage is used to clean toner on a transfer body and / or a photosensitive body; the detection module is configured to detect whether a working duration of the generating module exceeds a set duration; and the protection module is configured to perform protection on the generating module when the working duration exceeds the set duration. The embodiments of the present application detect whether the working duration of the generating module exceeds the set duration, i.e., the duration of the cleaning voltage, through the detection module, and perform protection on the generating module through the protection module if the working duration exceeds the set duration. The detection module timely identifies the abnormal state of the cleaning voltage and performs protection, thereby avoiding the problems of over-stress of a triode switch and abnormal consumption of toner caused by the abnormal cleaning voltage. BRIEF DESCRIPTION OF DRAWINGS

[0053] The accompanying drawings, which are incorporated herein and constitute part of this specification, illustrate embodiments consistent with the application and, together with the description, further serve to explain the principles of the application.

[0054] Figure 1 A structural schematic diagram of a cleaning voltage control circuit provided for an embodiment of the application;

[0055] Figure 2 A circuit structural schematic diagram of a generating module provided for an embodiment of the application;

[0056] Figure 3 A circuit structural schematic diagram of a detecting module provided for an embodiment of the application;

[0057] Figure 4 A structural schematic diagram of a cleaning voltage control circuit provided for an embodiment of the application.

[0058] Reference Signs:

[0059] 100, control module; 200, high voltage plate; 210, generating module; 220, detecting module; 230, protection module; 221, charging unit; 222, detecting unit; 211, initial voltage generating unit; 212, generating control unit; 213, generating unit; R1, first resistor; R2, second resistor; R3, third resistor; R4, fourth resistor; R5, fifth resistor; R6, sixth resistor; R7, seventh resistor; R8, eighth resistor; R9, ninth resistor; R10, tenth resistor; D1, first diode; D2, second diode; C1, first capacitor; C2, second capacitor; Q1, first switch; Q2, second switch.

[0060] The specific embodiments have been shown and described in the above drawings and specification herein. It will be understood by those skilled in the art that these embodiments are merely examples of the application and are not intended to limit the scope of the application, which is defined by the appended claims and their equivalents. The description and drawings are not intended to include all combinations of the elements described herein. DETAILED DESCRIPTION

[0061] The exemplary embodiments will be described in detail herein with reference to the drawings. The following description is presented to enable any person skilled in the art to make and use the application. Descriptions of specific devices and methods are included to provide a thorough understanding of the application. However, it will be apparent to those skilled in the art that the application can be practiced without these specific details. In some instances, well-known structures and devices are shown in block diagram form, rather than in detail, in order to avoid obscuring the application. The same numbers are used in different drawings to represent the same or similar elements.

[0062] In high-pressure imaging technology, the transfer high pressure includes positive transfer high pressure and negative transfer high pressure. The negative transfer high pressure is also called the cleaning voltage, which will be referred to as the cleaning voltage below. The positive transfer pressure is used to use an electric field to attract toner from the surface of the photoconductor drum (OPC) onto the paper. The cleaning voltage cleans some of the toner that has scattered onto the transfer roller and residual toner on the surface of the photoconductor drum. In terms of timing control, the cleaning voltage is usually only activated intermittently before paper feeding and after paper ejection (the activation sequence is controlled by firmware via an interface), and there are very few scenarios where it operates continuously. Secondly, the negative cleaning pressure is also continuously activated during printer preheating and toner supply. In most cases, the high-pressure cleaning pressure does not require high precision; as long as a constant voltage is generated, it is sufficient to clean away waste toner using the electric field.

[0063] If the cleaning voltage is abnormal during timing control, it will cause the transistor transformer in the cleaning voltage generation circuit to overheat. In severe cases, it will cause overstress to the transistor switching element, shorten the life of the element, and damage the high voltage board. If the cleaning voltage is abnormal during preheating and toner supply, it will cause toner supply to be prolonged during the preheating stage. Prolonged toner supply under abnormal conditions will lead to a large consumption of printer toner, and the toner in the cartridge will not be able to be refilled, resulting in toner waste and increased user costs.

[0064] This application provides a cleaning voltage control circuit, including: a generation module, a detection module, and a protection module. The generation module generates a cleaning voltage according to a control signal from the control module. The cleaning voltage is used to clean the toner on the transfer substrate and / or photoreceptor. The detection module detects whether the operating time of the generation module exceeds a set time. The protection module protects the generation module when the operating time exceeds the set time. This application uses the detection module to detect whether the operating time of the generation module exceeds the set time, i.e., the duration of the cleaning voltage. If it exceeds the set time, the protection module protects the generation module. The detection module promptly identifies abnormal states of the cleaning voltage and provides protection, preventing problems such as overstressing of the transistor switch and abnormal toner consumption caused by abnormal cleaning voltage.

[0065] The technical solution of this application and how the technical solution of this application solves the above-mentioned technical problems are described in detail below with specific embodiments. These specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments. The embodiments of this application will now be described with reference to the accompanying drawings.

[0066] like Figure 1 As shown, Figure 1A structural diagram of a cleaning voltage control circuit is provided in an embodiment of the present application. The cleaning voltage control circuit comprises a generating module 210, a detecting module 220, and a protection module 230. The generating module 210 is configured to generate a cleaning voltage according to a control signal of a control module 100. The cleaning voltage is used to clean toner on a transfer body and / or a photoreceptor. The detecting module 220 is configured to detect whether a working duration of the generating module 210 exceeds a set duration. The protection module 230 is configured to perform protection on the generating module 210 when the working duration exceeds the set duration.

[0067] Specifically, when the high-voltage plate 200 is connected to a 24V power supply, the control module 100 sends a control signal to the generating module 210. The generating module 210 generates a cleaning voltage according to the control signal of the control module 100. When the control signal is at a low level, the generating module 210 generates the cleaning voltage. The generating module 210 forms a stable negative voltage output through an internal circuit. When the control signal is at a high level, the cleaning voltage is turned off. After the cleaning voltage is turned on, the detecting module 220 detects whether the working duration of the generating module 210, i.e., the opening duration of the cleaning voltage, exceeds the set duration. If the working duration of the generating module 210 exceeds the set duration, it is determined that the cleaning voltage is in an abnormal state. The protection module 230 performs protection on the generating module 210, i.e., turns off the cleaning voltage. The present application timely identifies the abnormal state of the cleaning voltage through the detecting module 220 and performs protection, thereby avoiding problems such as over-stress of a transistor switch and abnormal consumption of toner caused by an abnormal cleaning voltage.

[0068] In one embodiment, the protection module 230 is further configured to send a first signal to the control module 100 when the working duration exceeds the set duration. The first signal is used to represent that the generating module 210 is working abnormally. The control module 100 is further configured to reset the generating module 210 and / or output an error information.

[0069] Specifically, the protection module 230 sends a first signal to the control module 100 when determining the abnormal state of the cleaning voltage. The control module 100 resets the generating module 210 according to the first signal. The generating module 210 is turned off after being reset. In order to avoid abnormality of the control module 100 and failure to turn off the generation of the cleaning voltage, the protection module 230 performs protection on the generating module 210 to turn off the generation of the cleaning voltage.

[0070] In one of the embodiments, the generating module 210 comprises: an initial voltage generating unit 211, a generating control unit 212, and a generating unit 213; the initial voltage generating unit 211 is configured to generate an initial cleaning voltage; the generating control unit 212 is configured to control the generating unit 213 to generate a cleaning voltage based on the initial cleaning voltage based on the control instruction of the control module 100; the output end of the protection module 230 is connected with the generating control unit 212, and the generating control unit 212 is further configured to control the generating unit 213 to stop generating the cleaning voltage based on the first signal.

[0071] As shown in Figure 2 , Figure 2 The circuit structure schematic diagram of the generating module 210 provided by an embodiment of the present application is shown in the figure. In the embodiment, the initial voltage generating unit 211 comprises a resistor R608, a diode D603, a diode D604, a capacitor C602, a capacitor C603, a resistor R602, a resistor R607, a voltage stabilizing tube ZD601, and a switch tube Q604, wherein the first end of the R608 is connected with the third power supply end, the second end of the R608 is connected with the anode of the D603, the cathode of the D603 is connected with the first end of the C602 and the first end of the Q604; the control end of the Q604 is connected with the anode of the ZD601, the second end of the Q604 is connected with the first end of the R607, the second end of the R607, the first end of the R602, and the second end of the C602; the second end of the R602 is grounded, the second end of the C603 is grounded, the anode of the D604 is connected with the second end of the C602 and the first end of the C603, the cathode of the D604 is connected with the first end of the primary side first coil of the transformer, and the second end of the primary side first coil of the transformer is grounded.

[0072] The generating control unit 212 comprises a resistor R603, a resistor R652, a resistor R651, a switch tube Q602, and a switch tube Q603; the control end of the Q602 is connected with the output end of the control module 100 through the resistor R652, the first end of the R603 is connected with the second power supply end, the second end of the R603 is connected with the output end of the control module 100, the control end of the Q602 is connected with the second end of the Q602 through the R651 and grounded; the first end of the Q602 is connected with the control end of the Q603 and the second end of the R608; the first end of the Q603 is connected with the second end of the primary side second coil winding of the transformer, the second end of the Q603 is grounded, and the first end of the primary side second coil winding of the transformer is connected with the first power supply end. The control end of the Q603 is further connected with the output end of the protection module 230 for receiving the second signal output by the protection module 230.

[0073] When the control signal is in a high-impedance state or at a high level, Q602 conducts due to the pull-up resistor R603. At this time, the collector of Q602 is connected to ground, so Q603 is off. Resistor R608 bears the entire voltage drop of 5V, and no current flows through diode D603. Since Q603 is not conducting, the primary coil of the transformer is not charged, and therefore there is no high-voltage output on the secondary side of the transformer. When the control signal from control module 100 is at a low level, the switching transistor Q602 is cut off. The 5V power supplied by the third power supply terminal flows through R608 to the base of Q603, turning Q603 on. Meanwhile, current flows through D603 to charge C602. Circuit analysis shows that the emitter of Q603 is grounded, and the base voltage of Q603 is approximately 0.7V. Since the base of Q603 is connected to the anode of D602, the cathode potential of D602 is approximately the same as the emitter potential of Q603, which is also "0". Since C602 is charging and its anode voltage is 0, the cathode of C602 will be under negative voltage after charging. ZD601 is a Zener diode. When the negative voltage is turned on, a weak current flows into the two ends of the ZD602 Zener diode, causing Q604 to be in amplification mode. According to loop analysis, the voltage drop across R607 is equal to the Zener diode's voltage and the bias voltage of the switching transistor Q604 Vbe. Therefore, the voltage drop across R607 is clear. In the closed-loop circuit composed of resistors R602, R607, and capacitor C603, the voltage drop across R607 is constant. According to Ohm's law, the voltage across C603 can be calculated. In fact, this circuit clamps the negative voltage at the cathode of capacitor C603 to achieve a stable negative clean voltage output on the secondary high-voltage side. This clean voltage is a constant value, and its magnitude can be adjusted by the resistance values ​​of resistors R607 and R602 in the primary circuit of the transformer.

[0074] In one embodiment, when the protection module 230 outputs a first signal, the generation control unit 212 controls the generation unit 213 to stop generating the cleaning voltage. Optionally, the first signal is a low level.

[0075] In one embodiment, such as Figure 3 As shown, Figure 3 The circuit structure diagram of the detection module 220 provided in an embodiment of this application is shown. The detection module 220 includes: a charging unit 221 and a detection unit 222; the charging unit 221 is used to charge when the generation module 210 starts to generate a clean voltage; the charging cut-off time of the charging unit 221 is equal to a set time; the detection unit 222 is used to determine whether the working time exceeds the set time based on the voltage of the charging unit 221, and when the working time exceeds the set time, send a second signal to the protection module 230; the second signal indicates that the working time exceeds the set time.

[0076] Specifically, when the control signal is low, the generating module 210 outputs the cleaning voltage, at this time the detecting module 220 starts to detect the duration of the cleaning voltage, that is, the working duration of the generating module 210, the charging unit 221 is used to charge the duration of the cleaning voltage, the detecting unit 222 determines whether the working duration of the generating module 210 exceeds the set duration according to the voltage of the charging unit 221, that is, whether the cleaning voltage is abnormal, if the cleaning voltage is abnormal, the second signal is sent to the protection module 230, the protection module 230 outputs the first signal according to the second signal, so that the generating module 210 stops generating the cleaning voltage; at the same time, the protection module 230 also sends the first signal to the control module 100, and the control signal output by the control module 100 is adjusted to high, so that the generating module 210 also stops generating the cleaning voltage. It can prevent the control module 100 from being unable to stop the generation of the cleaning voltage when it is abnormal, and the protection module 230 sends the first signal to the generating module 210 to stop the generation of the cleaning voltage.

[0077] In one of the embodiments, the charging unit 221 comprises: a switching subunit and a charging subunit; the switching subunit is used to turn on the charging path of the charging subunit when the generating module 210 starts to generate the cleaning voltage.

[0078] In one of the embodiments, the switching subunit comprises: a first switch Q1; the first end of the first switch Q1 is connected with the output end of the control module 100, the second end of the first switch Q1 is grounded, and the third end of the first switch Q1 is connected with the first power supply end.

[0079] In one of the embodiments, the switching subunit further comprises at least one of the following resistors: a first resistor R1, a second resistor R2 and a third resistor R3; the first end of the first switch Q1 is connected with the output end of the control module 100 through the first resistor R1; the first end of the first switch Q1 is also grounded through the second resistor R2; and the third end of the first switch Q1 is connected with the first power supply end through the third resistor R3.

[0080] In one of the embodiments, the charging subunit comprises: a fourth resistor R4 and a first capacitor C1; the first end of the fourth resistor R4 is connected with the third end of the first switch Q1, the second end of the fourth resistor R4 is connected with the first end of the first capacitor C1, and the second end of the first capacitor C1 is grounded; the first switch Q1 is in an off state when the control module 100 controls the generating module 210 to start to generate the cleaning voltage, so as to turn on the charging path between the first power supply end and the first capacitor C1, and the charging cutoff duration of the first capacitor C1 is less than or equal to the set duration.

[0081] In one embodiment, the charging unit 221 further comprises a first diode D1, an anode of the first diode D1 is connected to the second end of the first switch Q1, and a cathode of the first diode D1 is connected to the first end of the fourth resistor R4.

[0082] Please refer to Figure 3 When the control signal is low, the cleaning voltage is on at this time, the first switch Q1 is off, the first power supply end charges the first capacitor C1 through the third resistor R3, the first diode D1 and the fourth resistor R4, and the charging cutoff time is less than or equal to the set time. Therefore, by adjusting the RC value of the fourth resistor R4 and the first capacitor C1, the charging time of the first capacitor C1 can be extended or shortened, that is, the charging cutoff time of the first capacitor C1 can be set according to the actual situation. The charging cutoff time of the first capacitor C1 is less than or equal to the set time, which can ensure that the cleaning voltage duration is detected in advance before reaching the set time, and the circuit protection on the hardware is performed to prevent the occurrence of excessive stress caused by long-time work of the circuit, complete the monitoring of the cleaning voltage duration, and avoid other abnormalities caused by abnormal cleaning voltage.

[0083] In one embodiment, if the set time is 60s (the cleaning voltage working time exceeding 60s will have a circuit stress risk), that is, when the cleaning voltage is continuously opened for more than 60 seconds, the protection module 230 triggers the execution protection operation or the reset signal of the control module 100. According to the value of the set time, the value of the RC of the first capacitor C1 and the fourth resistor R4 in this embodiment can be calculated as follows:

[0084] According to the calculation formula of the zero state response:

[0085] u C = US– US* e –t / RC = US*(1–e –t / τ )

[0086] Where, the time constant τ = RC. For example, when the fourth resistor R4 is 30M and the first capacitor C1 has a capacitance value of 1uF, substituting them into the zero state response calculation formula gives: 3.4 = 24e –t / τ, and then the charging cutoff duration of the first capacitor C1 is derived, t = - RC*ln(0.142) = - 30M*1uF*(-1.95) = 58.5s < 60s. The circuit protection on the hardware can be realized before the cleaning voltage duration exceeds the set duration, preventing the occurrence of excessive stress caused by long-term operation of the circuit, and completing the monitoring of the cleaning voltage duration. In actual application, the values of the first capacitor C1 and the fourth resistor R4 can be determined according to the actual situation, and the application is not limited. In actual work, due to the influence of resistance and capacitance tolerances, there may be some deviations between the actual circuit protection action time and the theoretical value. This phenomenon is within the allowable range of hardware design, and is only an example of a theoretical calculation.

[0087] In one embodiment, as shown in FIG. 2, the charging unit 221 further includes a discharging unit. Figure 3 The discharging unit is configured to perform a discharging operation on the charging unit when the charging path of the charging unit is disconnected.

[0088] In one embodiment, the discharging unit includes a second diode D2 and a fifth resistor R5. The anode of the second diode D2 is connected to the first end of the first capacitor C1, the cathode of the second diode D2 is connected to the first end of the fifth resistor R5, and the second end of the fifth resistor R5 is connected to the third end of the first switch Q1. The first switch Q1 is in an on state when the generating module 210 stops generating the cleaning voltage, so as to turn on the discharging path of the first capacitor C1.

[0089] In one embodiment, the resistance value of the fifth resistor R5 is less than the resistance value of the fourth resistor R4.

[0090] Specifically, when the working duration of the generating module 210 does not reach the set duration, that is, the duration of the cleaning voltage does not reach the set duration, the electric quantity stored in the first capacitor C1 needs to be discharged to prepare for the next time when the cleaning voltage is turned on. At this time, the control signal is at a high level, the charging path of the charging unit is disconnected, the discharging operation is performed on the first capacitor C1, and the first capacitor C1 is discharged through the second diode D2, the fifth resistor R5, and the ground terminal, so that the first capacitor C1 performs the reset operation, wherein the time for the first capacitor C1 to completely release the electric quantity is the reset time. Considering the actual use of the cleaning high voltage, the reset time AT2 in the circuit in the embodiment is much smaller than the set duration AT1, so as to achieve the effect that the hardware circuit is quickly reset after the cleaning voltage is turned off. The set duration AT1 is a trigger limit time of the cleaning high voltage duration protection according to the product design specification and mechanical demand, and the cleaning voltage turning-on time used in normal printing is generally less than the time specified by AT1, and the set duration AT1 can represent the time demarcation line between the normal turning-on and abnormal turning-on of the cleaning high voltage. In the embodiment, the resistance value of the fifth resistor R5 is set to be smaller than that of the fourth resistor R4, so that the reset time AT2 in the circuit is much smaller than the set duration AT1, so as to achieve the effect that the hardware circuit is quickly reset after the cleaning voltage is turned off.

[0091] In one of the embodiments, as shown in FIG. 2, Figure 3 The detection unit 222 includes a comparator, a first input end of the comparator is connected with the reference voltage providing end, a second input end of the comparator is connected with the first end of the first capacitor C1, and an output end of the comparator is connected with the input end of the protection module 230. The comparator is used to send a second signal to the protection module 230 when the voltage of the first capacitor C1 is greater than the reference voltage, and the voltage value of the reference voltage is related to the set duration.

[0092] Specifically, when the voltage of the first capacitor C1 is greater than the reference voltage, that is, the working duration of the generating module 210 exceeds the set duration, at this time, the cleaning voltage is abnormal, the comparator sends a second signal to the protection module 230, and the second signal is at a high level; when the voltage of the first capacitor C1 is less than the reference voltage, at this time, the cleaning voltage is in a normal state, the comparator sends a first signal to the protection module 230, and the first signal is at a low level.

[0093] In one of the embodiments, the detection unit 222 further includes a sixth resistor R6 and a seventh resistor R7. A first end of the sixth resistor R6 is connected with the first power supply end, a second end of the sixth resistor R6 is connected with the first input end of the comparator and a first end of the seventh resistor R7 respectively, and a second end of the seventh resistor R7 is grounded.

[0094] Specifically, the sixth resistor R6 and the seventh resistor R7 provide a reference voltage for the first input end of the comparator by voltage division, in actual cases, the size of the reference voltage can be determined by adjusting the resistance values of the sixth resistor R6 and the seventh resistor R7, and the setting of the reference voltage can be set according to specific conditions, which is not limited herein.

[0095] In one of the embodiments, as shown in Figure 4 , Figure 4 The structure schematic diagram of the cleaning voltage control circuit provided by an embodiment of the present application is shown. The protection module 230 includes: a second switch Q2; the first end of the second switch Q2 is connected with the detection module 220, the second end of the second switch Q2 is grounded, and the third end of the second switch Q2 is connected with the second power supply end and the generation module 210 respectively; the second switch Q2 is used to send a first signal to the generation module 210 when the working time exceeds the set time, so that the generation module 210 performs self-protection.

[0096] Specifically, when the detection module 220 sends a first signal (low level) to the protection module 230, the second switch Q2 is disconnected, the third end of the second switch Q2 outputs a high level, and the generation module 210 continues to generate the cleaning voltage according to the high level signal; when the detection module 220 sends a second signal (high level) to the protection module 230, at this time, the working time of the generation module 210 is greater than the set time, that is, the cleaning voltage is abnormal, the second switch Q2 is turned on, the third end of the second switch Q2 outputs a low level, and the generation module 210 will stop generating the cleaning voltage according to the low level, so as to achieve the closing of the cleaning voltage, and also can reduce the stress problem of the cleaning voltage loop element.

[0097] In one of the embodiments, the protection module 230 further includes at least one of the following: an eighth resistor R8, a ninth resistor R9, and an RC filter unit; the first end of the eighth resistor R8 is connected with the output end of the detection module 220, and the second end of the eighth resistor R8 is connected with the first end of the second switch Q2; the first end of the ninth resistor R9 is connected with the second power supply end, and the second end of the ninth resistor R9 is connected with the third end of the second switch Q2; the RC filter unit includes: a tenth resistor R10 and a second capacitor C2; the first end of the tenth resistor R10 and the first end of the second capacitor C2 are both connected with the first end of the second switch Q2, and the second end of the tenth resistor R10 and the second end of the second capacitor C2 are both grounded.

[0098] When the cleaning voltage is turned on, the detection module 220 starts timing the opening time of the cleaning voltage, and when the working time of the generation module 210 reaches the set time length ΔT1, that is, when the cleaning voltage is in an abnormal state, the protection module 230 starts protection, and the generation module 210 stops generating the cleaning voltage. If the cleaning high voltage is turned off before the set time length ΔT1, the detection module 220 will be reset after the reset time ΔT2, that is, the first capacitor C1 is reset.

[0099] When the cleaning voltage is in an abnormal state, after the output signal of the protection module 230 is pulled low (triggering protection), the generation module 210 stops generating the cleaning voltage according to the output signal of the protection module 230, and the control signal of the control module 100 will be pulled high or the power supply of the first power supply end will be cut off, and the cleaning high voltage will be turned off. Two protection mechanisms can avoid the special situation of shutdown failure caused by the failure of the control module 100 or the firmware problem. The internal high voltage board 200 will enter a self-protection mechanism, which reduces the electrical stress of the cleaning voltage loop components. At this time, the control panel still displays error information, and the circuit is in an abnormal working state in the self-protection state, but it can effectively protect the hardware circuit from being further damaged.

[0100] The embodiment of the application provides a high voltage board 200, which comprises the cleaning voltage control circuit as any of the above.

[0101] The embodiment of the application provides an electronic device, which comprises the high voltage board 200 and the control module 100.

[0102] In the above embodiment, it should be understood that the control module can be a central processing unit (English: Central Processing Unit, for short: CPU), and can also be other general-purpose processors, digital signal processors (English: Digital Signal Processor, for short: DSP), application specific integrated circuits (English: Application Specific Integrated Circuit, for short: ASIC) and the like. The general-purpose processor can be a microprocessor, or the processor can be any conventional processor. The steps of the method disclosed in the application can be directly embodied as hardware processor execution, or executed by hardware and software modules in the processor.

[0103] The memory can include a random access memory (Random Access Memory, RAM), and can also include a non-volatile memory (Non-volatile Memory, NVM), for example, at least one disk memory.

[0104] The bus can be an Industry Standard Architecture (ISA) bus, a Peripheral Component (PCI) bus, or an Extended Industry Standard Architecture (EISA) bus, etc. The bus can be divided into an address bus, a data bus, a control bus, etc. For the convenience of representation, the bus in the drawings of the present application does not limit to only one bus or one type of bus.

[0105] The present application also provides a computer program product, comprising a computer program, which, when executed by a processor, implements the method described above.

[0106] The present application also provides a computer readable storage medium, which stores computer execution instructions, and when a processor executes the computer execution instructions, the method described above is implemented.

[0107] The readable storage medium described above can be implemented by any type of volatile or non-volatile storage device or their combination, 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. The readable storage medium can be any available medium that can be accessed by a general or special purpose computer.

[0108] An exemplary readable storage medium is coupled to the processor, so that the processor can read information from the readable storage medium, and can write information to the readable storage medium. Of course, the readable storage medium can also be an integral part of the processor. The processor and the readable storage medium can be located in an application specific integrated circuit (ASIC). Of course, the processor and the readable storage medium can also exist as discrete components in the device.

[0109] The division of units is only a logical functional division, and in actual implementation, there can be another division manner, for example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the coupling or direct coupling or communication connection between the units shown or discussed can be indirect coupling or communication connection through some interfaces, devices or units, which can be electrical, mechanical or other forms.

[0110] The units described as separate components may or may not be physically separate, and the components displayed as units may or may not be physical units, i.e., may be located in one place, or may be distributed to multiple network units. Part or all of the units can be selected according to actual needs to achieve the purpose of the embodiment scheme.

[0111] In addition, each functional unit in various embodiments of the application can be integrated into one processing unit, or each unit can exist physically, or two or more units can be integrated into one unit.

[0112] If the function is realized in the form of a software function unit and sold or used as an independent product, it can be stored in a computer readable storage medium. Based on this understanding, the technical solutions of the application essentially or the part that contributes to the prior art or part of the technical solutions can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes a number of instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the various embodiment methods of the application. The aforementioned storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM, Read-Only Memory), a random access memory (RAM, Random Access Memory), a magnetic disk or an optical disk, and various media that can store program codes.

[0113] Those skilled in the art can understand that all or part of the steps of the above-mentioned method embodiments can be completed by program instruction related hardware. The aforementioned program can be stored in a computer readable storage medium. The program executes to perform the steps of the above-mentioned method embodiments; and the aforementioned storage medium includes: ROM, RAM, magnetic disk or optical disk, and various media that can store program codes.

[0114] Finally, it should be noted that those skilled in the art, after considering the specification and practicing the application disclosed herein, will easily think of other embodiments of the application. The application is intended to cover any variations, uses, or adaptations of the application that follow the general principles of the application and include common knowledge or conventional technical means in the art that are not disclosed by the application, and is not limited to the precise structure described above and shown in the drawings, and various modifications and changes can be made without departing from the scope thereof. The scope of the application is only limited by the appended claims.

Claims

1. A cleaning voltage control circuit, characterized by, The cleaning voltage control circuit comprises a generating module, a detecting module and a protection module. The generating module is configured to generate a cleaning voltage according to a control signal of the control module, and the cleaning voltage is used to clean toner on a transfer body and / or a photoreceptor. The detecting module is configured to detect whether a working duration of the generating module exceeds a set duration. The protection module is configured to perform protection on the generating module and stop generating the cleaning voltage when the working duration exceeds the set duration.

2. The circuit according to claim 1, wherein The protection module is further configured to send a first signal to the control module when the working duration exceeds the set duration, and the first signal is used to represent that the generating module works abnormally. The control module is further configured to reset the generating module and / or output error information.

3. The circuit of claim 2, wherein, The detecting module comprises a charging unit and a detecting unit. The charging unit is configured to charge when the generating module starts to generate the cleaning voltage, and a charging cutoff duration of the charging unit is equal to the set duration. The detecting unit is configured to determine whether the working duration exceeds the set duration based on a voltage of the charging unit, and send a second signal to the protection module when the working duration exceeds the set duration, and the second signal represents that the working duration exceeds the set duration.

4. The circuit of claim 3, wherein, The charging unit comprises a switching subunit and a charging subunit. The switching subunit is configured to turn on a charging path of the charging subunit when the generating module starts to generate the cleaning voltage.

5. The circuit of claim 4, wherein, The charging unit further comprises a discharging subunit. The discharging subunit is configured to perform a discharging operation on the charging subunit when the charging path of the charging subunit is disconnected.

6. The circuit of claim 5, wherein, The switching subunit comprises a first switch. A first end of the first switch is connected to an output end of the control module, a second end of the first switch is grounded, and a third end of the first switch is connected to a first power supply end.

7. The circuit of claim 6, wherein, The switching subunit further comprises a first resistor, a second resistor and a third resistor. The first end of the first switch is connected to the output end of the control module through the first resistor. The first end of the first switch is further grounded through the second resistor. The third end of the first switch is connected to the first power supply end through the third resistor.

8. The circuit of claim 6, wherein, The charging subunit comprises a fourth resistor and a first capacitor. A first end of the fourth resistor is connected to the third end of the first switch, a second end of the fourth resistor is connected to a first end of the first capacitor, and a second end of the first capacitor is grounded. The first switch is in an off state when the control module controls the generating module to start to generate the cleaning voltage, so that a charging path between the first power supply end and the first capacitor is turned on, and a charging cutoff duration of the first capacitor is less than or equal to the set duration.

9. The circuit of claim 8, wherein, The charging subunit further comprises a first diode. An anode of the first diode is connected to the second end of the first switch, and a cathode of the first diode is connected to the first end of the fourth resistor.

10. The circuit of claim 8, wherein, The discharging subunit comprises a second diode and a fifth resistor. An anode of the second diode is connected with a first end of the first capacitor, a cathode of the second diode is connected with a first end of the fifth resistor, and a second end of the fifth resistor is connected with a third end of the first switch; The first switch is in a conducting state when the generating module stops generating the cleaning voltage, so as to conduct a discharge path of the first capacitor.

11. The circuit of claim 10, wherein, The fifth resistor has a resistance value smaller than that of the fourth resistor.

12. The circuit of claim 8, wherein, The detection unit comprises a comparator. A first input end of the comparator is connected with a reference voltage providing end, a second input end of the comparator is connected with a first end of the first capacitor, and an output end of the comparator is connected with an input end of the protection module. The comparator is configured to send the second signal to the protection module when a voltage of the first capacitor is greater than a reference voltage, and the reference voltage has a voltage value related to the set time length.

13. The circuit of claim 12, wherein, The detection unit further comprises a sixth resistor and a seventh resistor. A first end of the sixth resistor is connected with a first power supply end, a second end of the sixth resistor is connected with a first input end of the comparator and a first end of the seventh resistor respectively, and a second end of the seventh resistor is grounded.

14. The circuit of any one of claims 1-13, wherein, The protection module comprises a second switch. A first end of the second switch is connected with the detection module, a second end of the second switch is grounded, and a third end of the second switch is connected with a second power supply end and the generating module respectively. The second switch is configured to send a first signal to the generating module when the working time length exceeds the set time length, so as to make the generating module perform self-protection.

15. The circuit of claim 14, wherein, The generating module comprises an initial voltage generating unit, a generating control unit, and a generating unit. The initial voltage generating unit is configured to generate an initial cleaning voltage. The generating control unit is configured to control the generating unit to generate a cleaning voltage based on the initial cleaning voltage based on a control instruction of the control module. A third end of the second switch is connected with the generating control unit, and the generating control unit is further configured to control the generating unit to stop generating the cleaning voltage based on the first signal.

16. The circuit of claim 14, wherein, The protection module further comprises an eighth resistor, a ninth resistor, and an RC filter unit. A first end of the eighth resistor is connected with an output end of the detection module, and a second end of the eighth resistor is connected with a first end of the second switch. A first end of the ninth resistor is connected with a second power supply end, and a second end of the ninth resistor is connected with a third end of the second switch. The RC filter unit comprises a tenth resistor and a second capacitor, and a first end of the tenth resistor and a first end of the second capacitor are both connected with a first end of the second switch, and a second end of the tenth resistor and a second end of the second capacitor are both grounded.

17. A high pressure plate characterized by, The cleaning voltage control circuit comprises any one of claims 1-16.

18. An electronic device, comprising: The high-voltage board and the control module of claim 17.

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