Cleaning voltage control circuit, high-voltage board and electronic equipment

Abstract

The embodiment of the invention 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 cleaning voltage according to the control signal of the control module; the cleaning voltage is used for cleaning toner on the transfer printing body and / or the photoreceptor; the detection module is used for detecting whether the working time length of the generation module exceeds the set time length or not; and the protection module is used for protecting the generation module when the working duration exceeds the set duration. The detection module detects whether the working duration of the generation module exceeds the set duration, namely the duration of the cleaning voltage, and if the working duration exceeds the set duration, the generation module is protected through the protection module. The abnormal state of the cleaning voltage is recognized in time through the detection module, protection is carried out, and the problems of triode switch overstress and abnormal ink powder consumption caused by abnormal cleaning voltage are avoided.

Description

Technical Field

[0001] The present application relates to the field of electronic imaging technology, and in particular to a cleaning voltage control circuit, a high voltage board and an electronic device. Background Art

[0002] The transfer high voltage in high-voltage imaging technology includes transfer positive high voltage and transfer negative high voltage. The transfer negative high voltage is also called cleaning voltage, which is collectively referred to as cleaning voltage below. The transfer positive pressure is used to adsorb the toner from the surface of the photosensitive drum (OPC, Organic Photoconductor) to the paper through the electric field force. The cleaning voltage plays the role of cleaning some of the toner scattered on the transfer roller and the residual toner on the surface of the photosensitive drum. In terms of timing control, the cleaning voltage is often only turned on in stages before paper feeding and after paper discharge (the turning-on timing is controlled by the firmware through the interface), and there are very few scenarios for continuous action. Secondly, when the printer is preheating the toner supply, the cleaning negative pressure will also be turned on continuously.

[0003] If the cleaning voltage is abnormal, the temperature of the transistor transformer in the cleaning voltage generation circuit will rise too high during timing control. In severe cases, it will cause overstress of the transistor switching element and shorten the service life of the element. If the cleaning voltage is abnormal during preheating and powder supply, it will cause long-term powder supply during the preheating stage. Long-term powder supply under abnormal conditions will cause a large amount of printer toner consumption, and the toner in the toner cartridge cannot be refilled, resulting in toner waste and increased user costs.

[0004] Therefore, there is an urgent need for a circuit that can promptly identify the abnormal state of the cleaning voltage. Summary of the invention

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

[0006] In a first aspect, an embodiment of the present application provides a cleaning voltage control circuit, the cleaning voltage control circuit comprising: a generation module, a detection module, and a protection module;

[0007] A generating module, used for generating a cleaning voltage according to a control signal of the controlling module; the cleaning voltage is used for cleaning the toner on the transfer body and / or the photosensitive body;

[0008] A detection module is used to detect whether the working time of the generation module exceeds the set time;

[0009] The protection module is used to protect the generation module when the working time exceeds the set time.

[0010] In one embodiment, the protection module is further used to send a first signal to the control module when the working time exceeds the set time; the first signal is used to indicate that the generating module is working abnormally;

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

[0012] In one of the embodiments, the detection module includes: a charging unit, a detection unit;

[0013] A charging unit, used for charging when the generation module starts to generate the clean voltage; the charging cut-off time of the charging unit is equal to the set time;

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

[0015] In one of the embodiments, the charging unit includes: a switch subunit and a charging subunit;

[0016] The switch subunit is used to turn on the charging path of the charging subunit when the generating module starts to generate the clean voltage.

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

[0018] The discharge sub-unit is used to perform a discharge operation on the charging sub-unit when the charging path of the charging sub-unit is disconnected.

[0019] In one of the embodiments, the switch subunit includes: a first switch;

[0020] A first end of the first switch is connected to the 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 the first power supply end.

[0021] In one of the embodiments, the switch subunit further includes at least one of the following resistors: a first resistor, a second resistor, and a third resistor;

[0022] A first end of the first switch is connected to an output end of the control module through a first resistor;

[0023] The first end of the first switch is also grounded via a second resistor;

[0024] The third terminal of the first switch is connected to the first power supply terminal through a third resistor.

[0025] In one of the embodiments, the charging subunit includes: a fourth resistor and a first capacitor;

[0026] 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 the 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 generation module to start generating the clean voltage, so that the charging path between the first power supply end and the first capacitor is turned on, and the charging cutoff time of the first capacitor is less than or equal to the set time.

[0028] In one of the embodiments, the charging subunit further includes: a first diode;

[0029] 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.

[0030] In one of the embodiments, the discharge subunit includes: a second diode and a fifth resistor;

[0031] An anode of the second diode is connected to the first end of the first capacitor, a cathode of the second diode is connected to the first end of the fifth resistor, and a second end of the fifth resistor is connected to the third end of the first switch;

[0032] 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.

[0033] In one embodiment, the resistance of the fifth resistor is smaller than the resistance of the fourth resistor.

[0034] In one of the embodiments, the detection unit includes: a comparator;

[0035] The first input terminal of the comparator is connected to the reference voltage supply terminal, the second input terminal of the comparator is connected to the first terminal of the first capacitor, and the output terminal of the comparator is connected to the input terminal of the protection module;

[0036] The comparator is used 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 detection unit further includes: a sixth resistor and a seventh resistor;

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

[0039] In one embodiment, the protection module includes: a second switch;

[0040] A first end of the second switch is connected to the detection module, a second end of the second switch is grounded, and a third end of the second switch is connected to the second power supply end and the generation module respectively;

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

[0042] In one of the embodiments, the generation module includes: an initial voltage generation unit, a generation control unit, and a generation unit;

[0043] An initial voltage generating unit, used for generating an initial cleaning voltage;

[0044] A generation control unit, configured to control the generation 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 to the generation control unit, and the generation control unit is further used to control the generation unit to stop generating the cleaning voltage based on the first signal.

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

[0047] A first end of the eighth resistor is connected to the output end of the detection module, and a second end of the eighth resistor is connected to the first end of the second switch;

[0048] A first end of the ninth resistor is connected to the second power supply end, and a second end of the ninth resistor is connected to the third end of the second switch;

[0049] The RC filter unit includes: 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 to 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 a second aspect, an embodiment of the present application provides a high voltage board, comprising any of the above-mentioned cleaning voltage control circuits.

[0051] In a third aspect, an embodiment of the present application provides an electronic device, comprising the above-mentioned high-voltage board and a control module.

[0052] The embodiments of the present application provide a cleaning voltage control circuit, a high-voltage board, and an electronic device, wherein the cleaning voltage control circuit includes: a generation module, a detection module, and a protection module; the generation module is used to generate a cleaning voltage according to a control signal of the control module; the cleaning voltage is used to clean the toner on the transfer body and / or the photosensitive body; the detection module is used to detect whether the working time of the generation module exceeds the set time; the protection module is used to protect the generation module when the working time exceeds the set time. The present application detects whether the working time of the generation module exceeds the set time, that is, the duration of the cleaning voltage, through the detection module. If it exceeds the set time, the generation module is protected through the protection module. The detection module promptly identifies the abnormal state of the cleaning voltage and performs protection to avoid the problem of overstress of the transistor switch and abnormal consumption of toner caused by the abnormal cleaning voltage. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0054] Figure 1 A schematic diagram of the structure of a cleaning voltage control circuit provided in one embodiment of the present application;

[0055] Figure 2 A schematic diagram of the circuit structure of a generation module provided in one embodiment of the present application;

[0056] Figure 3 A schematic diagram of the circuit structure of a detection module provided in one embodiment of the present application;

[0057] Figure 4 A schematic diagram of the structure of a cleaning voltage control circuit provided in one embodiment of the present application.

[0058] Reference numerals:

[0059] 100, control module; 200, high voltage board; 210, generation module; 220, detection module; 230, protection module; 221, charging unit; 222, detection unit; 211, initial voltage generating unit; 212, generation control unit; 213, generation 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 above drawings have shown clear embodiments of the present application, which will be described in more detail later. These drawings and text descriptions are not intended to limit the scope of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0061] Here, exemplary embodiments will be described in detail, and examples thereof are shown in the accompanying drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Instead, they are only examples of devices and methods consistent with some aspects of the present application.

[0062] The transfer high voltage in high-voltage imaging technology includes transfer positive high voltage and transfer negative high voltage. The transfer negative high voltage is also called cleaning voltage, which is uniformly referred to as cleaning voltage below. The transfer positive pressure is used to adsorb the toner from the surface of the photosensitive drum (OPC, Organic Photoconductor) to the paper through the electric field force. The cleaning voltage plays the role of cleaning some of the toner scattered on the transfer roller and the residual toner on the surface of the photosensitive drum. In terms of timing control, the cleaning voltage is often only turned on in stages before paper feeding and after paper discharge (the opening timing is controlled by the firmware through the interface), and there are very few scenarios for continuous action. Secondly, when the printer is preheating the powder supply, the cleaning negative pressure will also be turned on continuously. In most cases, the cleaning high voltage does not require high precision. As long as a constant voltage is generated, the waste powder can be cleaned by relying on the electric field force.

[0063] If the cleaning voltage is abnormal during timing control, it will cause the temperature of the transistor transformer in the cleaning voltage generation circuit to rise too high. In severe cases, it will cause overstress of the transistor switching element, shorten the service life of the element, and damage the high-voltage board. If the cleaning voltage is abnormal during preheating and powder supply, it will cause long-term powder supply during the preheating stage. Long-term powder supply under abnormal conditions will cause a large amount of printer toner consumption, and the toner in the ink cartridge cannot be refilled, resulting in toner waste and increased user costs.

[0064] A cleaning voltage control circuit provided in an embodiment of the present application includes: a generation module, a detection module, and a protection module; the generation module is used to generate a cleaning voltage according to a control signal of the control module; the cleaning voltage is used to clean the colorant on the transfer body and / or the photosensitive body; the detection module is used to detect whether the working time of the generation module exceeds the set time; the protection module is used to protect the generation module when the working time exceeds the set time. The present application detects whether the working time of the generation module exceeds the set time, that is, the duration of the cleaning voltage, through the detection module. If it exceeds the set time, the protection module is used to protect the generation module. The detection module promptly identifies the abnormal state of the cleaning voltage and performs protection to avoid the problem of overstress of the transistor switch and abnormal consumption of toner caused by the abnormal cleaning voltage.

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

[0066] like Figure 1 As shown, Figure 1A schematic diagram of the structure of a cleaning voltage control circuit provided in one embodiment of the present application, the cleaning voltage control circuit includes: a generation module 210, a detection module 220, and a protection module 230; the generation module 210 is used to generate a cleaning voltage according to a control signal of the control module 100; the cleaning voltage is used to clean the colorant on the transfer body and / or the photosensitive body; the detection module 220 is used to detect whether the working time of the generation module 210 exceeds the set time; the protection module 230 is used to protect the generation module 210 when the working time exceeds the set time.

[0067] Specifically, when the high-voltage board 200 is connected to a 24V power supply, the control module 100 sends a control signal to the generation module 210, and the generation module 210 generates a clean voltage according to the control signal of the control module 100. When the control signal is at a low level, the generation module 210 generates a clean voltage, and the generation module 210 forms a stable negative voltage output through its internal circuit; when the control signal is at a high level, the clean voltage is turned off. After the clean voltage is turned on, the detection module 220 detects whether the working time of the generation module 210, that is, the turning-on time of the clean voltage, exceeds the set time. If the working time of the generation module 210 exceeds the set time, the clean voltage can be determined to be in an abnormal state, and the protection module 230 performs protection on the generation module 210, that is, turns off the clean voltage. The present application promptly identifies the abnormal state of the clean voltage through the detection module 220, and performs protection to avoid the problem of overstress of the transistor switch and abnormal consumption of toner caused by the abnormal clean voltage.

[0068] In one embodiment, the protection module 230 is also used to send a first signal to the control module 100 when the working time exceeds the set time; the first signal is used to indicate that the generating module 210 is working abnormally; the control module 100 is also used to reset the generating module 210, and / or output an error message.

[0069] Specifically, when the protection module 230 determines that the cleaning voltage is in an abnormal state, it will send a first signal to the control module 100. The control module 100 resets the generation module 210 according to the first signal. After the generation module 210 is reset, the generation of the cleaning voltage is turned off. At the same time, in order to avoid the control module 100 being abnormal and unable to shut down the generation of the cleaning voltage, the protection module 230 will protect the generation module 210 and shut down the generation of the cleaning voltage.

[0070] In one embodiment, the generation module 210 includes: an initial voltage generating unit 211, a generation control unit 212, and a generation unit 213; the initial voltage generating unit 211 is used to generate an initial cleaning voltage; the generation control unit 212 is used to control the generation 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 to the generation control unit 212, and the generation control unit 212 is also used to control the generation unit 213 to stop generating the cleaning voltage based on the first signal.

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

[0072] The generation control unit 212 includes resistors R603, R652, R651, switches Q602 and Q603; the control end of the switch Q602 is connected to the output end of the control module 100 through the resistor R652, the first end of the resistor R603 is connected to the second power supply end, the second end of R603 is connected to the output end of the control module 100, and the control end of Q602 is connected to the second end of Q602 through R651 and grounded; the first end of Q602 is connected to the control end of the switch Q603 and the second end of the resistor R608; the first end of Q603 is connected to the second end of the second coil winding on the primary side of the transformer, the second end of Q603 is grounded, and the first end of the second coil winding on the primary side of the transformer is connected to the first power supply end. The control end of the switch Q603 is also connected to 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 high impedance state or high level, Q602 is turned on due to the pull-up resistor R603. At this time, the collector of Q602 is turned on to the ground, so Q603 is in the off state. At this time, the resistor R608 bears the entire voltage drop of the 5V voltage, and no current flows through the diode D603. Since Q603 is not turned on, the primary coil of the transformer does not store energy, so there is no high voltage output on the secondary side of the transformer. When the control signal of the control module 100 is low level, the switch tube Q602 is turned off, and the third power supply terminal provides a 5V power supply that flows into the base of Q603 through R608, and Q603 is turned on. On the other hand, the current charges C602 through D603. From the circuit analysis, it can be seen that the emitter of Q603 is grounded, the base voltage of Q603 is about 0.7V, and the base of Q603 is connected to the anode of D602, so the cathode potential of D602 is roughly the same as the emitter of Q603, which is also "0". Since C602 is charging and the anode voltage is 0, the cathode point of C602 is negative after charging. ZD601 is a voltage stabilizing diode. When the negative voltage is turned on, a weak current flows into both ends of the ZD602 voltage stabilizing tube, making Q604 in an amplified state. According to the loop analysis, the voltage drop across R607 is equal to the voltage stabilizing value of the voltage stabilizing diode and the bias voltage of the switch tube Q604 Vbe, so the voltage division of R607 can be determined. In the closed loop composed of resistors R602, R607, and capacitor C603, the voltage division of R607 can be determined. According to Ohm's law, the pressure at both ends of C603 can be calculated. In fact, this circuit is a high-voltage output circuit that realizes the output of a stable negative voltage clean voltage on the secondary high-voltage side by clamping the negative voltage of the cathode of the C603 capacitor. The clean voltage is a fixed value, and its size 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 the first signal, the generation control unit 212 controls the generation unit 213 to stop generating the cleaning voltage. Optionally, the first signal is at a low level.

[0075] In one embodiment, if Figure 3 As shown, Figure 3 A circuit structure diagram of a detection module 220 provided in an embodiment of the present application, wherein 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 cleaning voltage; the charging cutoff duration of the charging unit 221 is equal to the set duration; the detection unit 222 is used to determine whether the working duration exceeds the set duration based on the voltage of the charging unit 221, and send a second signal to the protection module 230 when the working duration exceeds the set duration; the second signal indicates that the working duration exceeds the set duration.

[0076] Specifically, when the control signal is at a low level, the generation module 210 outputs a cleaning voltage. At this time, the detection module 220 starts to detect the duration of the cleaning voltage, that is, the working duration of the generation module 210. The duration of charging of the charging unit 221 is used to monitor the duration of the cleaning voltage. The detection unit 222 determines whether the working duration of the generation 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, a second signal is sent to the protection module 230. The protection module 230 outputs a first signal according to the second signal to stop the generation module 210 from generating the cleaning voltage. At the same time, the protection module 230 also sends a first signal to the control module 100. The control signal output by the control module 100 is adjusted to a high level, which can also stop the generation module 210 from generating the cleaning voltage. It can prevent the control module 100 from being unable to shut down the cleaning voltage when it is abnormal, and the protection module 230 sends a first signal to the generation module 210 to shut down the generation of the cleaning voltage.

[0077] In one embodiment, the charging unit 221 includes: a switch subunit and a charging subunit; the switch subunit is used to turn on the charging path of the charging subunit when the generation module 210 starts to generate the cleaning voltage.

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

[0079] In one embodiment, the switch subunit further includes 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 to 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; the third end of the first switch Q1 is connected to the first power supply end through the third resistor R3.

[0080] In one embodiment, the charging subunit includes: a fourth resistor R4 and a first capacitor C1; the first end of the fourth resistor R4 is connected to the third end of the first switch Q1, the second end of the fourth resistor R4 is connected to 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 a disconnected state when the control module 100 controls the generation module 210 to start generating a clean voltage, so that the charging path between the first power supply end and the first capacitor C1 is turned on, and the charging cut-off time of the first capacitor C1 is less than or equal to the set time.

[0081] In one embodiment, the charging unit 221 further includes: 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] See also Figure 3 When the control signal is at a low level, the cleaning voltage is turned on, the first switch Q1 is disconnected, and the first power supply end charges the first capacitor C1 through the third resistor R3, the first diode D1, and the fourth resistor R4. The charging cut-off 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 cut-off time of the first capacitor C1 can be set according to actual conditions. The charging cut-off 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 hardware circuit protection is performed to prevent the occurrence of excessive stress caused by long-term operation 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 duration is 60s (there is a risk of circuit stress if the cleaning voltage works for more than 60s), that is, when the cleaning voltage is continuously turned on for more than 60 seconds, the protection module 230 is triggered to perform a protection operation or the reset signal of the control module 100 is triggered. According to the set duration, the values ​​of the first capacitor C1 and the fourth resistor R4RC in this embodiment can be calculated as follows:

[0084] The calculation formula based on the zero-state response is as follows:

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

[0086] Wherein, the time constant τ = RC. For example, when the fourth resistor R4 is 30M and the first capacitor C1 has a capacitance of 1uF, substituting it into the zero-state response calculation formula yields: 3.4 = 24e –t / τ, and then derive the charging cut-off time of the first capacitor C1, then t = - RC*ln(0.142) = - 30M*1uF*(-1.95) = 58.5s <60s, which can realize hardware circuit protection before the duration of the clean voltage exceeds the set duration, prevent the occurrence of excessive stress caused by the long-term operation of the circuit, and complete the monitoring of the duration of the clean voltage. In actual application, the values ​​of the first capacitor C1 and the fourth resistor R4 can be determined according to actual conditions, and this application does not limit it. In addition, in actual work, due to the influence of the resistance and capacitance tolerances of the parameters adjusted by RC, the actual circuit protection action time will deviate slightly from the theoretical value. This phenomenon is within the range allowed by the hardware design. This is only an example of an implementation of theoretical calculation.

[0087] In one embodiment, if Figure 3 As shown, the charging unit 221 further includes: a discharge sub-unit; the discharge sub-unit is used to perform a discharge operation on the charging sub-unit when the charging path of the charging sub-unit is disconnected.

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

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

[0090] Specifically, when the working time of the generation module 210 does not reach the set time, that is, when the duration of the cleaning voltage does not reach the set time, the electricity stored in the first capacitor C1 needs to be discharged to prepare for the next time the cleaning voltage is turned on. At this time, the control signal is at a high level, the charging path of the charging subunit is disconnected, 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 a reset operation, wherein the time when the first capacitor C1 completely releases the electricity is the reset time. Considering the actual use of the cleaning high voltage, the reset time △T2 in the loop in this embodiment is much smaller than the set time △T1, so as to achieve the effect of quickly resetting the hardware circuit after the cleaning voltage is turned off. The set time △T1 is a trigger limit time of the cleaning high voltage duration protection set according to the product design specifications and mechanical requirements. The cleaning voltage turn-on time used in normal printing is generally less than the time specified by △T1. The set time △T1 can represent the time boundary between the normal opening and abnormal opening of the cleaning high voltage. In this embodiment, by setting the resistance of the fifth resistor R5 to be smaller than the resistance of the fourth resistor R4, the reset time △T2 in the loop is much shorter than the set time △T1, so as to achieve the effect of quickly resetting the hardware circuit after the cleaning voltage is turned off.

[0091] In one embodiment, if Figure 3 As shown, the detection unit 222 includes: a comparator; a first input terminal of the comparator is connected to a reference voltage supply terminal, a second input terminal of the comparator is connected to a first terminal of a first capacitor C1, and an output terminal of the comparator is connected to an input terminal 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 a 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, when the working time of the generation module 210 exceeds the set time, the cleaning voltage is abnormal, and the comparator sends a second signal to the protection module 230, and the second signal is a high level; when the voltage of the first capacitor C1 is less than the reference voltage, the cleaning voltage is normal, and the comparator sends a first signal to the protection module 230, and the first signal is a low level.

[0093] In one embodiment, the detection unit 222 also includes: a sixth resistor R6 and a seventh resistor R7; the first end of the sixth resistor R6 is connected to the first power supply end, the second end of the sixth resistor R6 is respectively connected to the first input end of the comparator and the first end of the seventh resistor R7, and the 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 terminal of the comparator through voltage division. In actual situations, the size of the reference voltage can be determined by adjusting the resistance values ​​of the sixth resistor R6 and the seventh resistor R7. The setting of the reference voltage can be set according to the specific situation, and this application is not limited here.

[0095] In one embodiment, if Figure 4 As shown, Figure 4 A schematic diagram of the structure of a clean voltage control circuit provided in an embodiment of the present application. The protection module 230 includes: a second switch Q2; a first end of the second switch Q2 is connected to the detection module 220, a second end of the second switch Q2 is grounded, and a third end of the second switch Q2 is respectively connected to the second power supply end and the generation module 210; 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 duration of the generation module 210 is greater than the set duration, that is, the cleaning voltage is abnormal, the second switch Q2 is turned on, and the third end of the second switch Q2 outputs a low level. The generation module 210 will shut down the generation of the cleaning voltage according to the low level, thereby achieving the goal of shutting down the cleaning voltage, and at the same time, it can also reduce the stress problem of the cleaning voltage loop components.

[0097] In one embodiment, the protection module 230 further includes at least one of the following: an eighth resistor R8, a ninth resistor R9, and an RC filtering unit; the first end of the eighth resistor R8 is connected to the output end of the detection module 220, and the second end of the eighth resistor R8 is connected to the first end of the second switch Q2; the first end of the ninth resistor R9 is connected to the second power supply end, and the second end of the ninth resistor R9 is connected to the third end of the second switch Q2; the RC filtering 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 to 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] After the cleaning voltage is turned on, the detection module 220 starts to count the time when the cleaning voltage is turned on. When the working time of the generation module 210 reaches the set time △T1, that is, the cleaning voltage is in an abnormal state, the protection module 230 starts to perform protection, so that the generation module 210 stops generating the cleaning voltage. If the cleaning high voltage is turned off before the set time △T1, the detection module 220 will be reset after the recovery time of the reset time △T2, 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. At the same time, 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. The two protection mechanisms can avoid the special situation of shutdown failure caused by the failure of the control module 100 or firmware problems. The high-voltage board 200 will enter the self-protection mechanism to reduce the electrical stress of the cleaning voltage circuit components. At this time, the control panel error message is still displayed. The circuit is in an abnormal working state in the self-protection state, but it can effectively protect the hardware circuit from further damage.

[0100] The embodiment of the present application provides a high voltage board 200, comprising any of the above-mentioned cleaning voltage control circuits.

[0101] An embodiment of the present application provides an electronic device, including the above-mentioned high-voltage board 200 and the control module 100.

[0102] In the above embodiments, it should be understood that the control module can be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), etc. A general-purpose processor can be a microprocessor or any conventional processor. The steps of the method disclosed in the invention can be directly implemented as a hardware processor, or can be implemented by a combination of hardware and software modules in the processor.

[0103] The memory may include a high-speed memory (Random Access Memory, RAM), and may also include a non-volatile memory (NVM), such as at least one disk storage.

[0104] The bus can be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (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 ease of representation, the bus in the drawings of this application is not limited to only one bus or one type of bus.

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

[0106] The present application also provides a computer-readable storage medium, in which computer-executable instructions are stored. When a processor executes the computer-executable instructions, the above method is implemented.

[0107] The above-mentioned readable storage medium can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, 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 a processor so that the processor can read information from the readable storage medium and write information to the readable storage medium. Of course, the readable storage medium can also be a component of the processor. The processor and the readable storage medium can be located in an application specific integrated circuit (Application Specific Integrated Circuits, referred to as: ASIC). Of course, the processor and the readable storage medium can also exist in the device as discrete components.

[0109] The division of units is only a logical function division, and there may be other divisions in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interface, device or unit, which can be electrical, mechanical or other forms.

[0110] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0111] In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0112] If the function is implemented in the form of a software functional 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 solution of the present invention, or the part that contributes to the prior art, or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium, including several instructions for a computer device (which can be a personal computer, server, or network device, etc.) to perform all or part of the steps of the methods of each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk, etc. Various media that can store program codes.

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

[0114] Finally, it should be noted that those skilled in the art will readily conceive of other embodiments of the present invention after considering the specification and practicing the invention disclosed herein. The present invention is intended to cover any variations, uses or adaptations of the present invention, which follow the general principles of the present invention and include common knowledge or customary technical means in the art not disclosed by the present invention, are not limited to the precise structure described above and shown in the drawings, and may be modified and changed in various ways without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.

Claims

1. A cleaning voltage control circuit, characterized in that: The cleaning voltage control circuit comprises: a generation module, a detection module, and a protection module; The generating module is used to generate a cleaning voltage according to a control signal of the controlling module; the cleaning voltage is used to clean the toner on the transfer body and / or the photosensitive body; The detection module is used to detect whether the working time of the generation module exceeds the set time; The protection module is used to protect the generation module when the working time exceeds a set time.

2. The circuit according to claim 1, characterized in that The protection module is also used to send a first signal to the control module when the working time exceeds a set time; the first signal is used to indicate that the generating module is working abnormally; The control module is also used to reset the generation module and / or output error information.

3. The circuit according to claim 2, characterized in that The detection module includes: a charging unit and a detection unit; The charging unit is used to charge when the generating module starts to generate the cleaning voltage; the charging cut-off time of the charging unit is equal to the set time; The detection unit is used to determine whether the working time exceeds the set time based on the voltage of the charging unit, and send a second signal to the protection module when the working time exceeds the set time; the second signal indicates that the working time exceeds the set time.

4. The circuit according to claim 3, characterized in that The charging unit comprises: a switch subunit and a charging subunit; The switch subunit is used to turn on the charging path of the charging subunit when the generation module starts to generate the cleaning voltage.

5. The circuit according to claim 4, characterized in that The charging unit further comprises: a discharging subunit; The discharge sub-unit is used to perform a discharge operation on the charging sub-unit when the charging path of the charging sub-unit is disconnected.

6. The circuit according to claim 5, characterized in that The switch subunit comprises: a first switch; A first end of the first switch is connected to the 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 the first power supply end.

7. The circuit according to claim 6, characterized in that The switch subunit further includes at least one of the following resistors: 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 also 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 according to claim 6, characterized in that The charging subunit includes: a fourth resistor and a first capacitor; The first end of the fourth resistor is connected to the third end of the first switch, the second end of the fourth resistor is connected to the first end of the first capacitor, and the second end of the first capacitor is grounded; The first switch is in an off state when the control module controls the generation module to start generating a clean voltage, so that a charging path between the first power supply end and the first capacitor is turned on, and a charging cutoff time of the first capacitor is less than or equal to the set time.

9. The circuit according to claim 8, characterized in that The charging subunit further includes: 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 according to claim 8, characterized in that The discharge sub-unit includes: a second diode and a fifth resistor; An anode of the second diode is connected to a first end of the first capacitor, a cathode of the second diode is connected to a first end of the fifth resistor, and a second end of the fifth resistor is connected to 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 according to claim 10, characterized in that The resistance of the fifth resistor is smaller than the resistance of the fourth resistor.

12. The circuit according to claim 8, characterized in that The detection unit comprises: a comparator; The first input terminal of the comparator is connected to the reference voltage supply terminal, the second input terminal of the comparator is connected to the first terminal of the first capacitor, and the output terminal of the comparator is connected to the input terminal of the protection module; The comparator is used to send the 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.

13. The circuit according to claim 12, characterized in that The detection unit further includes: a sixth resistor and a seventh resistor; The first end of the sixth resistor is connected to the first power supply end, the second end of the sixth resistor is respectively connected to the first input end of the comparator and the first end of the seventh resistor, and the second end of the seventh resistor is grounded.

14. The circuit according to any one of claims 1 to 13, characterized in that: The protection module includes: a second switch; A first end of the second switch is connected to the detection module, a second end of the second switch is grounded, and a third end of the second switch is connected to the second power supply end and the generation module respectively; The second switch is used to send a first signal to the generating module when the working time exceeds a set time, so that the generating module performs self-protection.

15. The circuit according to claim 14, characterized in that The generation module includes: an initial voltage generation unit, a generation control unit, and a generation unit; An initial voltage generating unit, used for generating an initial cleaning voltage; A generation control unit, configured to control the generation unit to generate a cleaning voltage based on the initial cleaning voltage based on a control instruction of the control module; The third end of the second switch is connected to the generation control unit, and the generation control unit is further used to control the generation unit to stop generating the cleaning voltage based on the first signal.

16. The circuit according to claim 14, characterized in that The protection module further includes at least one of the following: an eighth resistor, a ninth resistor, and an RC filter unit; A first end of the eighth resistor is connected to the output end of the detection module, and a second end of the eighth resistor is connected to the first end of the second switch; The first end of the ninth resistor is connected to the second power supply end, and the second end of the ninth resistor is connected to the third end of the second switch; The RC filter unit includes: 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 to 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.

17. A high voltage board, characterized in that: Comprising the cleaning voltage control circuit as described in any one of claims 1-16.

18. An electronic device, characterized in that: It comprises the high voltage board and control module as claimed in claim 17.

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