CN111697829B

CN111697829B - High-voltage divider, image forming apparatus, and method for controlling high-voltage divider

Info

Publication number: CN111697829B
Application number: CN202010615436.7A
Authority: CN
Inventors: 黄香川; 苗曌星; 胡智敏
Original assignee: Zhuhai Pantum Electronics Co Ltd
Current assignee: Hefei Bentu Intelligent Manufacturing Co ltd
Priority date: 2020-06-30
Filing date: 2020-06-30
Publication date: 2021-09-28
Anticipated expiration: 2040-06-30
Also published as: CN111697829A

Abstract

The application provides a high-voltage divider, an image forming apparatus, and a method for controlling the high-voltage divider. The high voltage divider device is configured to receive a first voltage from a power supply; when the high-voltage division device is started, receiving a Pulse Width Modulation (PWM) signal with a first duty ratio from a controller, and gradually increasing a second voltage based on the PWM signal with the first duty ratio; when the high-voltage division device works, receiving a PWM signal with a second duty ratio from the SoC, and outputting a second voltage with the maximum amplitude value based on the PWM signal with the second duty ratio; when the high-voltage division device is turned off, receiving a PWM signal with a third duty ratio from the SoC, and stopping the output of the second voltage based on the PWM signal with the third duty ratio; the first duty cycle is less than the second duty cycle and the third duty cycle is less than the first duty cycle. Therefore, the high voltage output by the high-voltage divider cannot be influenced by temperature drift.

Description

High-voltage divider, image forming apparatus, and method for controlling high-voltage divider

Technical Field

The present disclosure relates to electronic technologies, and particularly to a high voltage divider, an image forming apparatus, and a method for controlling the high voltage divider.

Background

In the image forming process of the image forming apparatus, it is generally necessary to use multiple high voltages. In order to save cost, a high voltage is generated by a transformer, and then a voltage dividing circuit divides the high voltage into multiple high voltages, thereby reducing the use of the transformer.

However, the voltage output by the conventional voltage divider circuit may generate a temperature drift (i.e., temperature drift) phenomenon with the change of the environmental temperature, which is not favorable for the image formation of the image forming apparatus, and may result in a decrease in the operation performance of the image forming apparatus.

Disclosure of Invention

The application provides a high-voltage divider, an image forming device and a control method of the high-voltage divider to realize voltage output meeting high-voltage target requirements, and output high voltage cannot be influenced by temperature drift, so that stable imaging of the image forming device is facilitated, the working performance of the image forming device is improved, and the image forming device has competitiveness.

In a first aspect, the present application provides a high pressure partial pressure apparatus comprising: a high voltage dividing device configured to receive a first voltage from a power supply source; the high-voltage dividing device is also configured to receive a Pulse Width Modulation (PWM) signal with a first duty ratio from the controller when the high-voltage dividing device is started, and gradually increase the amplitude of the second voltage based on the PWM signal with the first duty ratio; when the high-voltage division device works, receiving a PWM signal with a second duty ratio from the controller, and outputting a second voltage with the maximum amplitude value based on the PWM signal with the second duty ratio; when the high-voltage division device is turned off, receiving a PWM signal with a third duty ratio from the controller, and stopping the output of the second voltage based on the PWM signal with the third duty ratio; the first duty cycle is less than the second duty cycle and the third duty cycle is less than the first duty cycle.

Optionally, the high voltage dividing device is further configured to start when the duty ratio of the PWM signal is a first duty ratio as the duty ratio of the PWM signal is gradually increased.

Optionally, the high pressure partial pressure device comprises: a first circuit and a second circuit electrically connected; the first circuit is configured to receive a PWM signal with a first duty ratio from the controller when the high-voltage division device is started; when the high-voltage division device works, receiving a PWM signal with a second duty ratio from the controller; when the high-voltage division device is turned off, receiving a PWM signal with a third duty ratio from the controller; the first duty cycle is less than the second duty cycle, and the third duty cycle is less than the first duty cycle; a second circuit configured to receive a first voltage from a power supply; a second circuit configured to gradually increase the magnitude of the second voltage based on the PWM signal having the duty ratio of the first duty ratio; outputting a second voltage with the maximum amplitude based on the PWM signal with the duty ratio as the second duty ratio; and stopping the output of the second voltage based on the PWM signal having the third duty ratio.

Optionally, the first circuit comprises: a first resistor and a first capacitor; the first end of the first resistor is used for receiving the PWM signal, the second end of the first resistor and the first end of the first capacitor are both connected with the second circuit, and the second end of the first capacitor is grounded.

Optionally, the second circuit comprises: the first PNP type triode comprises a first resistor, a second resistor, a third resistor, a first PNP type triode and a fourth resistor; the first end of the second resistor is connected with the first circuit, the second end of the second resistor is connected with the first end of the third resistor and the base electrode of the first PNP type triode respectively, the emitting electrode of the first PNP type triode is connected with third voltage, the amplitude of the third voltage is smaller than that of the first voltage, the collecting electrode of the first PNP type triode and the second end of the third resistor are connected with the first end of the fourth resistor, the first end of the fourth resistor is used for outputting second voltage, and the second end of the fourth resistor is connected with the first voltage.

Optionally, the second circuit is specifically configured to adjust the first PNP type triode to operate in the amplification region based on the PWM signal with the first duty cycle, so as to gradually increase the amplitude of the second voltage; based on the PWM signal with the duty ratio being the second duty ratio, the first PNP type triode is adjusted to work in a cut-off region so as to output a second voltage with the maximum amplitude; and adjusting the first PNP type triode to work in a saturation region based on the PWM signal with the third duty ratio to control the amplitude of the second voltage to be zero.

Optionally, the second circuit comprises: the circuit comprises a fifth resistor, M sixth resistors, M second PNP type triodes and a seventh resistor, wherein M is a positive integer greater than or equal to 2; wherein, the first end of the fifth resistor is connected with the first circuit, the M sixth resistors are connected in series, the M second PNP type triodes are connected in series, the first end of the sixth resistor positioned at one side of the M sixth resistors connected in series and the base electrode of the second PNP type triode positioned at one side of the M second PNP type triodes connected in series are both connected with the second end of the fifth resistor, the first end of the nth sixth resistor is connected with the base electrode of the nth second PNP type triode, n is a positive integer which is more than 0 and less than or equal to M, the emitter electrode of the second PNP type triode positioned at one side of the M second PNP type triodes connected in series is connected with a third voltage, the amplitude of the third voltage is less than that of the first voltage, the second end of the sixth resistor positioned at the other side of the M sixth resistors connected in series and the collector electrode of the second PNP type triode positioned at the other side of the M second PNP type triodes connected in series are both connected with the first end of the seventh resistor, the first end of the seventh resistor is used for outputting the second voltage, and the second end of the seventh resistor is connected with the first voltage.

Optionally, the second circuit is specifically configured to adjust, based on the PWM signal with the first duty ratio, that the M second PNP transistors all operate in the amplification region, so as to gradually increase the amplitude of the second voltage; based on the PWM signal with the duty ratio being the second duty ratio, adjusting the M second PNP type triodes to work in a cut-off region so as to output a second voltage with the maximum amplitude; and adjusting the M second PNP type triodes to work in a saturation region based on the PWM signal with the third duty ratio to control the amplitude of the second voltage to be zero.

In a second aspect, the present application provides an image forming apparatus comprising: an image forming apparatus body, a controller, a power supply, and a high voltage dividing device in any one of the possible designs of the first aspect and the first aspect; the controller is connected with the high-voltage division device and used for sending a Pulse Width Modulation (PWM) signal to the high-voltage division device; the power supply is connected with the high-voltage division device and used for providing a first voltage for the high-voltage division device; the high-voltage divider is connected with the image forming device body and used for providing a second voltage for the image forming device body.

Optionally, the image forming apparatus further comprises: a high voltage generating circuit; the high-voltage generating circuit is respectively connected with the power supply and the high-voltage dividing device; the power supply is used for providing a fourth voltage for the high-voltage generating circuit, and the high-voltage dividing device is used for providing the first voltage for the high-voltage dividing device.

Optionally, the image forming apparatus body includes: the device comprises a photosensitive drum, a charging roller, a developing roller, a transfer roller, an entering paper box, a paper feeding roller, a conveying roller, a laser, a hot roller, a press roller, a discharging roller and a discharging paper box; wherein the high voltage dividing device is used for providing a second voltage for at least one of the charging roller, the developing roller, the transfer roller, the heat roller and the press roller.

Optionally, the high voltage divider is further configured to provide a second voltage to the hot roller; the power supply is used for supplying a first voltage to the charging roller.

The advantageous effects of the image forming apparatus provided in the second aspect and the possible designs of the second aspect can be found in the advantageous effects of the possible embodiments of the first aspect and the first aspect, and are not described again here.

In a third aspect, the present application provides a control method for a high-voltage divider, which is applied to the high-voltage divider in any one of the possible designs of the first aspect and the first aspect; the method comprises the following steps: the high-voltage division device receives a first voltage from a power supply; the high-voltage division device receives a Pulse Width Modulation (PWM) signal with a first duty ratio from the controller when the high-voltage division device is started, and gradually increases the amplitude of a second voltage based on the PWM signal with the first duty ratio; when the high-voltage division device works, receiving a PWM signal with a second duty ratio from the controller, and outputting a second voltage with the maximum amplitude value based on the PWM signal with the second duty ratio; when the high-voltage division device is turned off, receiving a PWM signal with a third duty ratio from the controller, and stopping the output of the second voltage based on the PWM signal with the third duty ratio; the first duty cycle is less than the second duty cycle and the third duty cycle is less than the first duty cycle.

Optionally, the method further comprises: the high-voltage division device is gradually increased along with the duty ratio of the PWM signal and is started when the duty ratio is the PWM signal with the first duty ratio.

The beneficial effects of the control method of the high-pressure partial pressure device provided by the third aspect may refer to the beneficial effects brought by the possible embodiments of the first aspect and the first aspect, and are not described herein again.

According to the high-voltage dividing device, the image forming device and the control method of the high-voltage dividing device, the high-voltage dividing device receives a first voltage from a power supply, and when the high-voltage dividing device is started, a Pulse Width Modulation (PWM) signal with a duty ratio of a first duty ratio is received from a controller, and the amplitude of a second voltage is gradually increased based on the PWM signal with the duty ratio of the first duty ratio; when the high-voltage division device works, receiving a PWM signal with a second duty ratio from the controller, and outputting a second voltage with the maximum amplitude value based on the PWM signal with the second duty ratio; when the high-voltage division device is turned off, receiving a PWM signal with a third duty ratio from the controller, and stopping the output of the second voltage based on the PWM signal with the third duty ratio; the first duty cycle is less than the second duty cycle and the third duty cycle is less than the first duty cycle. In this application, high pressure bleeder mechanism can be based on the PWM signal of different duty cycles, determine high pressure bleeder mechanism's operating condition, so that control high pressure bleeder mechanism cooperates high pressure bleeder mechanism's operating condition, realize carrying out different operations to the second voltage through the power supply of first voltage, not only make the amplitude of second voltage promote gradually, still make the amplitude of the second voltage of output the biggest, also can stop the output of second voltage, thereby, the voltage that high pressure bleeder mechanism output not only can not receive the influence that the temperature floats, still satisfy the target demand of high voltage, be favorable to image forming device to stabilize the formation of image, image forming device's working property has been promoted, make image forming device possess the competitiveness.

Drawings

In order to more clearly illustrate the technical solutions in the present application or the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.

Fig. 1 is a schematic structural diagram of a high-pressure voltage divider according to an embodiment of the present disclosure;

fig. 2 is a schematic structural diagram of a high-pressure voltage divider according to an embodiment of the present disclosure;

fig. 3 is a schematic structural diagram of a high-pressure voltage divider according to an embodiment of the present disclosure;

fig. 4 is a graph illustrating a variation of the second voltage with a duty ratio of the PWM signal according to an embodiment of the present application;

fig. 5 is a schematic diagram illustrating a curve of the dc current amplification factor hFE according to the collector current IC of the first PNP transistor at different operating environment temperatures according to an embodiment of the present application;

fig. 6 is a graph illustrating a variation of the second voltage with a duty ratio of the PWM signal according to an embodiment of the present application;

fig. 7 is a schematic flowchart of a control method of a high-pressure voltage divider according to an embodiment of the present disclosure;

FIG. 8a is a schematic structural diagram of an image forming apparatus according to an embodiment of the present disclosure;

FIG. 8b is a schematic structural diagram of an image forming apparatus according to an embodiment of the present disclosure;

fig. 9 is a schematic structural diagram of an image forming apparatus body according to an embodiment of the present application;

fig. 10 is a schematic structural diagram of a part of an image forming apparatus according to an embodiment of the present application.

Description of reference numerals:

400-high pressure divider; 401 — a first circuit; 402 — a second circuit; r1 — first resistance; c1 — first capacitance; r2 — second resistance; r3 — third resistor; q1-a first PNP transistor; r4 — fourth resistor; r5 — fifth resistor; r6 — sixth resistor; q2-a second PNP transistor; r7 — seventh resistor; v1 — first voltage; v2 — second voltage; v3 — third voltage;

1-an image forming apparatus; 100-image forming apparatus body; 200-a controller; 300-a power supply; 500-high voltage generating circuit; 101-a photosensitive drum; 102-a charging roller; 103-a developing roller; 104-a transfer roller; 105-an entrance carton; 106-a paper feed roller; 107-conveying roller; 108-a laser; 109-hot rollers; 110-a press roll; 111-discharge roller; 112-discharge carton; 113-a charging power supply; 114-a developing power supply; 115 — transfer power supply; 116-hot roll power supply.

Detailed Description

In the present application, "at least one" means one or more, "a plurality" means two or more. "and/or" describes the association relationship of the associated objects, meaning that there may be three relationships, e.g., a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone, wherein A and B can be singular or plural. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship. "at least one of the following" or similar expressions refer to any combination of these items, including any combination of the singular or plural items. For example, at least one (one) of a alone, b alone, or c alone, may represent: a alone, b alone, c alone, a and b in combination, a and c in combination, b and c in combination, or a, b and c in combination, wherein a, b and c may be single or multiple. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

The application provides a high-voltage divider, an image forming device and a control method of the high-voltage divider, which can determine the working state of the high-voltage divider based on PWM signals with different duty ratios so as to control the working state of the high-voltage divider to be matched with the working state of the high-voltage divider, and realize different operations on a second voltage through power supply of a first voltage; secondly, the amplitude of the output second voltage is stabilized at the maximum value, and the influence of temperature drift on the amplitude of the second voltage is solved; finally, the output of the second voltage may also be stopped. Therefore, the high-voltage divider can meet the target requirement of high voltage, is favorable for the stable imaging of the image forming device, and improves the working performance of the image forming device, so that the image forming device has competitiveness.

The image forming apparatus may include a copier, a printer, a facsimile machine, a multifunction machine, or the like, according to the division of functions. The image forming apparatus, which is divided according to the principle of image formation, may include: a laser forming apparatus, an ink jet forming apparatus, a needle forming apparatus, or the like.

The following describes a specific implementation process of the high-pressure voltage divider according to the present application in detail with reference to specific examples.

In this application, the power supply may directly supply the first voltage V1 to the high voltage divider 400, or may supply the first voltage V1 to the high voltage divider 400 through another voltage divider module, which is not limited in this application. The first voltage V1 has a larger amplitude, which is convenient for the high voltage divider 400 to use.

In this application, a controller, such as a system on a chip (SoC), etc., may determine an operating state of the high voltage divider 400 according to actual requirements, where the operating state may include starting, operating, and turning off. Accordingly, the controller may send Pulse Width Modulation (PWM) signals with different duty ratios to the high voltage divider 400, so that the high voltage divider 400 may determine the operating state of the high voltage divider 400 based on the PWM signals with different duty ratios, so as to control the high voltage divider 400 to cooperate with the operating state of the high voltage divider 400 to achieve the output of the second voltage V2.

Based on the foregoing description, the controller may send a PWM signal with a first duty ratio to the high voltage divider 400 when it is required to start the high voltage divider 400, so that the high voltage divider 400 determines that the high voltage divider 400 is starting at this time. Thus, when the high voltage divider 400 is activated, the high voltage divider 400 may gradually increase the amplitude of the second voltage V2 based on the PWM signal having the first duty ratio, so as to lay a foundation for tamping the second voltage V2 with the largest amplitude output by the high voltage divider 400, and leave enough time for the amplitude of the second voltage V2 to reach the maximum as a buffer, thereby preventing the second voltage V2 from overshooting.

When the high voltage divider 400 is required to operate, the controller may increase the first duty ratio of the PWM signal to the second duty ratio, and send the PWM signal with the second duty ratio to the high voltage divider 400, so that the high voltage divider 400 determines that the high voltage divider 400 operates normally at this time. Therefore, when the high voltage divider 400 operates, the high voltage divider 400 can output the second voltage V2 with the maximum amplitude based on the PWM signal with the second duty ratio, which not only can meet the target requirement of high voltage, but also can maintain the stability of the second voltage V2 output by the high voltage divider 400.

The maximum amplitude of the second voltage V2 may be determined based on the amplitude of the first voltage V1 and the circuit connection condition of the high voltage divider 400, and the application does not limit the maximum amplitude of the second voltage V2.

When the high voltage divider 400 needs to be turned off, the controller may decrease the second duty ratio of the PWM signal to a third duty ratio, and send the PWM signal with the third duty ratio to the high voltage divider 400, so that the high voltage divider 400 determines that the high voltage divider 400 needs to be turned off at this time. Thus, when the high voltage dividing device 400 is turned off, the high voltage dividing device 400 may stop operating the second voltage V2 based on the PWM signal having the third duty ratio, so that the high voltage dividing device 400 stops the output of the second voltage V2.

Wherein the first duty cycle is less than the second duty cycle and the third duty cycle is less than the first duty cycle. In addition, the specific sizes of the first duty ratio, the second duty ratio and the third duty ratio are not limited, and specifically, a certain range can be met, and specific numerical values can also be set.

According to the high-voltage division device, the high-voltage division device receives a first voltage from a power supply, and when the high-voltage division device is started, the slave controller receives a Pulse Width Modulation (PWM) signal with a duty ratio of a first duty ratio, and gradually increases the amplitude of a second voltage based on the PWM signal with the duty ratio of the first duty ratio; when the high-voltage division device works, receiving a PWM signal with a second duty ratio from the controller, and outputting a second voltage with the maximum amplitude value based on the PWM signal with the second duty ratio; when the high-voltage division device is turned off, receiving a PWM signal with a third duty ratio from the controller, and stopping the output of the second voltage based on the PWM signal with the third duty ratio; the first duty cycle is less than the second duty cycle and the third duty cycle is less than the first duty cycle. In this application, high pressure bleeder mechanism can be based on the PWM signal of different duty cycles, determine high pressure bleeder mechanism's operating condition, so that control high pressure bleeder mechanism cooperates high pressure bleeder mechanism's operating condition, realize carrying out different operations to the second voltage through the power supply of first voltage, not only make the amplitude of second voltage promote gradually, still make the amplitude of the second voltage of output the biggest, also can stop the output of second voltage, thereby, the voltage that high pressure bleeder mechanism output not only can not receive the influence that the temperature floats, still satisfy the target demand of high voltage, be favorable to image forming device to stabilize the formation of image, image forming device's working property has been promoted, make image forming device possess the competitiveness.

Based on the above description, a specific structure of the high-pressure voltage dividing apparatus of the present application is exemplified with reference to fig. 1.

Fig. 1 is a schematic structural diagram of a high-pressure voltage divider according to an embodiment of the present disclosure. As shown in fig. 1, the high-pressure voltage dividing apparatus of the present application may include: a first circuit 401 and a second circuit 402 electrically connected.

In this application, the power supply may directly supply the first voltage V1 to the second circuit 402, or may supply the first voltage V1 to the second circuit 402 through another voltage dividing module, which is not limited in this application. The first voltage V1 has a larger amplitude, which is convenient for the second circuit 402 to use. And the specific implementation manner of the second circuit 402 is not limited in this application.

In this application, the controller may determine the operating state of the high voltage divider 400 according to actual requirements, and the operating state may include start-up, operation, and shut-down. Thus, the controller may send Pulse Width Modulation (PWM) signals with different duty ratios to the first circuit 401, so that the first circuit 401 may determine the operating state of the high voltage dividing apparatus 400 based on the PWM signals with different duty ratios, so as to control the second circuit 402 electrically connected to the first circuit to implement the output of the second voltage V2 in cooperation with the operating state of the high voltage dividing apparatus 400. The specific implementation manner of the first circuit 401 is not limited in this application.

Based on the foregoing description, the controller may send a PWM signal with a first duty ratio to the first circuit 401 when it is required to start the high voltage dividing apparatus 400, so that the first circuit 401 determines that the high voltage dividing apparatus 400 is being started at this time. Thus, when the high voltage divider 400 is activated, the second circuit 402 may gradually increase the amplitude of the second voltage V2 based on the PWM signal having the first duty ratio, so as to lay down a foundation for tamping the second voltage V2 with the largest amplitude output by the second circuit 402, and leave enough time for the amplitude of the second voltage V2 to reach the maximum, thereby preventing the second voltage V2 output by the second circuit 402 from overshooting.

When the SoC needs to operate the high voltage divider 400, the SoC may increase the first duty ratio of the PWM signal to the second duty ratio, and send the PWM signal with the second duty ratio to the first circuit 401, so that the first circuit 401 determines that the high voltage divider 400 operates normally at this time. Therefore, when the high voltage divider 400 operates, the first circuit 401 may output the second voltage V2 with the maximum amplitude based on the PWM signal with the second duty ratio, so that the second circuit 402 can not only meet the target requirement of the high voltage, but also maintain the stability of the second voltage V2 output by the second circuit 402.

When the SoC needs to turn off the high voltage divider 400, the second duty ratio of the PWM signal may be reduced to a third duty ratio, and the PWM signal with the third duty ratio is sent to the first circuit 401, so that the first circuit 401 determines that the high voltage divider 400 needs to be turned off at this time. Thus, when the high voltage dividing device 400 is turned off, the first circuit 401 may stop operating the second voltage V2 based on the PWM signal having the third duty ratio, so that the second circuit 402 stops the output of the second voltage V2.

In the application, first circuit 401 can receive the PWM signal of different duty ratios from the SoC when high voltage divider 400 is in different operating conditions, second circuit 402 that is electrically connected with first circuit 401 is based on the PWM signal of different duty ratios, can adjust the concrete operation to the second voltage in real time through the power supply of first voltage, make the amplitude of second voltage slowly increase and can output the biggest second voltage of amplitude, the stability of second voltage has been ensured, make the second voltage not only can not receive the influence of temperature drift, still satisfy the target demand of high voltage, can also stop the output of second voltage, high voltage divider 400 has been ensured to export highly compressed integrality, make adopt simple circuit structure alright realize the stable output of voltage and stop output. Therefore, the circuit structure of the high-voltage divider 400 is simple and low in cost, and the high-voltage divider 400 can stably output high voltage, so that the image forming apparatus can stably form images, the working performance of the image forming apparatus is improved, and the image forming apparatus has competitiveness.

Based on the above description, the first circuit 401 may include a variety of implementations. Alternatively, as shown in fig. 2 and 3, the first circuit 401 may include: a first resistor R1 and a first capacitor C1.

The first end of the first resistor R1 is used for receiving the PWM signal, the second end of the first resistor R1 and the first end of the first capacitor C1 are both connected to the second circuit 402, and the second end of the first capacitor C1 is grounded.

Based on the above connection relationship, the first resistor R1 and the first capacitor C1 form a low pass filter, which can filter the input PWM signal into a dc voltage signal, i.e., the voltage at point a.

In the present application, the second circuit 402 may include a variety of implementations. Two possible implementations of the second circuit 402 are illustrated below with reference to fig. 2 and 3.

In one possible implementation, and with continued reference to fig. 2, the second circuit 402 may include: the circuit comprises a second resistor R2, a third resistor R3, a first PNP type triode Q1 and a fourth resistor R4.

A first end of the second resistor R2 is connected to the first circuit 401, a second end of the second resistor R2 is connected to a first end of the third resistor R3 and a base of the first PNP transistor Q1, the second resistor R2 functions as a current limiting, and a voltage at a second end of the second resistor R2 is regarded as a voltage at a point B. The emitter of the first PNP triode Q1 is connected to a third voltage V3, the amplitude of the third voltage V3 is smaller than the amplitude of the first voltage V1, the collector of the first PNP triode Q1 and the second end of the third resistor R3 are both connected to the first end of the fourth resistor R4, the first end of the fourth resistor R4 is used to output a second voltage V2, and the second end of the fourth resistor R4 is connected to the first voltage V1.

Based on the above connection relationship, as the duty ratio of the PWM signal is gradually increased (e.g. slowly increased or stepwise increased, e.g. from 25% to 30%, and further from 30% to 35%, etc.), the second voltage V2 is slowly increased or stepwise increased, and when the first circuit 401 receives the PWM signal with the first duty ratio, the high-voltage divider 400 is activated, which is equivalent to a soft start. At this time, the voltage at the point a is greater than the voltage at the point B (i.e., the difference between the third voltage V3 and the threshold voltage of the first PNP transistor Q1), so that the first PNP transistor Q1 operates in the amplification region, and the amplitude of the second voltage V2 gradually increases. Therefore, the second voltage V2 is prevented from overshooting, a buffering effect is achieved, and the first voltage V1 is prevented from being affected.

The minimum value of the first duty ratio is a value corresponding to the voltage at the point a being greater than the voltage at the point B, and the maximum value of the first duty ratio is a value corresponding to the voltage at the point a being much greater than the voltage at the point B.

When the first circuit 401 receives the PWM signal with the second duty ratio, the high voltage dividing device 400 operates. At this time, the voltage at the point a is much greater than the voltage at the point B (at this time, the voltage at the point B is greater than the difference between the third voltage V3 and the threshold voltage of the first PNP transistor Q1), so that the first PNP transistor Q1 operates in the cut-off region, and based on the reasonable setting of the respective resistances of the second resistor R2, the third resistor R3, and the fourth resistor R4, the voltage division of the first voltage V1 is achieved, so as to output the second voltage V2 with the largest amplitude, that is, the first PNP transistor Q1 operates in the cut-off region when the second voltage V2 is about to reach the amplitude of the target requirement, so as to control the amplitude of the second voltage V2 to be the largest, not only meet the target requirement of the high voltage, but also solve the problem that the second voltage V2 causes the temperature drift of the high voltage divider 400, and after the first PNP transistor Q1 operates in the cut-off region, the amplitude of the second voltage V2 depends on the values of the second resistor R2, the third resistor R3, and the fourth resistor R4, the influence of the first PNP type triode Q1 is avoided, and the stability of the second voltage V2 is ensured.

The minimum value of the second duty ratio is a value corresponding to the voltage at the point a being much larger than the voltage at the point B.

Table 1 shows temperature coefficients of resistance of the second resistor R2, the third resistor R3, and the fourth resistor R4, respectively. As shown in Table 1, the rate of change of the resistance value with the temperature change is between 100 and 200 ppm, and the influence on the output second voltage V2 is very small and can be ignored.

TABLE 1

1Ω≤R1Ω≤10Ω	±200ppm/℃
		10Ω≤R1Ω≤10Ω	±200ppm/℃
1Ω≤R1Ω≤10Ω	±100ppm/℃

When the first circuit 401 receives the PWM signal with the third duty ratio, the high voltage dividing device 400 is turned off. At this time, the voltage at the point a is less than or equal to the voltage at the point B (i.e., the difference between the third voltage V3 and the threshold voltage of the first PNP transistor Q1), so that the first PNP transistor Q1 operates in the saturation region, and the operation on the second voltage V2 is stopped to control the amplitude of the second voltage V2 to be zero, thereby stopping the output of the second voltage V2.

The maximum value of the third duty ratio is a value corresponding to a case where the voltage at the point a is just larger than the voltage at the point B.

In a specific embodiment, assuming that the target requirement of the second voltage V2 is-600V, in conjunction with fig. 4, the specific implementation process of achieving-600V output by using the high voltage divider shown in fig. 2 includes:

as shown in fig. 4, when the first circuit 401 receives the PWM signal with the first duty ratio between 20% and 45%, the voltage at the point a is greater than the voltage at the point B (i.e., the difference between the third voltage V3 and the threshold voltage of the first PNP transistor Q1), so that the first PNP transistor Q1 operates in the amplification region.

When the first circuit 401 receives the PWM signal with the second duty ratio, and the second duty ratio is between 45% and 100%, the voltage at the point a is much higher than the voltage at the point B (the voltage at the point B is higher than the difference between the third voltage V3 and the threshold voltage of the first PNP transistor Q1), and the first PNP transistor Q1 can enter the cut-off region when the amplitude of the voltage is smaller than 600V (e.g., -500V). Thus, the second circuit 402 can output the second voltage V2 of-600V, and-600V can be kept constant.

When the first circuit 401 receives the PWM signal with the third duty ratio, and the third duty ratio is between 0% and 20%, the voltage at the point a is less than or equal to the voltage at the point B (i.e., the difference between the third voltage V3 and the threshold voltage of the first PNP transistor Q1), so that the first PNP transistor Q1 operates in the saturation region.

In fig. 4, the abscissa is the duty ratio of the PWM signal, and the ordinate is the magnitude of the second voltage V2 in volts V.

In the following, the technical solutions of the prior art and the present application are illustrated by comparison.

In the prior art, the high voltage divider shown in fig. 2 is utilized, and the first circuit 401 receives PWM signals with different duty ratios to adjust the voltages at the two ends of the second resistor, so as to control the first PNP transistor Q1 to be in a conducting state and to operate in an amplification region and a saturation region, so as to linearly adjust the magnitude of the second voltage V2, so that the second circuit 402 outputs the second voltage V2.

When the voltage at the point a is less than or equal to the voltage at the point B (i.e., the difference between the third voltage V3 and the threshold voltage of the first PNP transistor Q1), the first PNP transistor Q1 operates in a saturated conducting state, and at this time, the second voltage V2 is equal to the third voltage V3. Since the magnitude of the third voltage V3 is small, the magnitude of the second voltage V2 is almost zero or can be considered zero compared to the target requirement of a high voltage.

When the voltage at the point a is greater than the voltage at the point B (i.e., the difference between the third voltage V3 and the threshold voltage of the first PNP transistor Q1), the first PNP transistor Q1 operates in the amplifying conducting state, and the current IR2 of the second resistor R2 is equal to (the voltage at the point a minus the voltage at the point B)/R2. The base current IB of the first PNP transistor Q1 is small and negligible. Therefore, IR3 ≈ IR2, then the second voltage V2 is equal to the product IR2 of the current over the third resistor R3 and the second resistor R2, i.e., V2 ═ R3 ≈ IR2, and the second voltage V2 is linearly adjustable.

When the temperature of the operating environment of the first PNP transistor Q1 changes, in the prior art, the dc current amplification factor hFE of the first PNP transistor Q1 changes with the change of the temperature, that is, a temperature drift phenomenon as shown in fig. 5 occurs, so that the amplitude of the second voltage V2 also has a temperature drift phenomenon. The hFE is used to represent the multiple relation between the output current and the input current of the triode, the IC is the collector current of the triode, and the IB is the base current of the triode.

Fig. 5 is a schematic diagram showing the change of the dc current amplification hFE with the change of the IC at different operating environment temperatures of the first PNP transistor Q1. In fig. 5, IC is plotted on the abscissa in mA and hFE is plotted on the ordinate as the dc current amplification factor.

As shown in fig. 5, when the voltage between the collector and the emitter of the first PNP transistor Q1 is-10V, curve 1 represents that the dc current amplification hFE varies with the change of the IC when the operating environment temperature of the first PNP transistor Q1 is +125 ℃, curve 2 represents that the dc current amplification hFE varies with the change of the IC when the operating environment temperature of the first PNP transistor Q1 is +25 ℃, and curve 3 represents that the dc current amplification hFE varies with the change of the IC when the operating environment temperature of the first PNP transistor Q1 is-55 ℃.

Fig. 6 shows a curve diagram of the second voltage V2 as the duty ratio of the PWM signal changes, assuming that the first voltage V1 is large enough. In fig. 6, the abscissa is the duty ratio of the PWM signal, and the ordinate is the magnitude of the second voltage V2 in volts V.

As shown in fig. 6, when the duty ratio of the PWM signal is between 0% and 20%, the first PNP transistor Q1 operates in the saturation conduction region. When the duty ratio of the PWM signal is between 20% and 100%, the first PNP transistor Q1 operates in the amplification region. In fig. 6, curve 1 represents the amplitude of the second voltage V2 when the operating environment temperature of the first PNP transistor Q1 is +25 ℃, and curve 2 represents the amplitude of the second voltage V2 when the operating environment temperature of the first PNP transistor Q1 is +50 ℃.

It can be seen that the amplitude of the second power source in the curve 1 and the curve 2 changes with the change of the operating temperature of the first PNP transistor Q1, i.e. the temperature drift occurs, so that the output of the second voltage V2 is unstable, and the image quality of the image forming apparatus is affected.

Compared with the prior art, the application is based on the specific structure of the high-voltage divider shown in fig. 2, the controller combines the whole process from starting, working to turning-off of the high-voltage divider, can transmit PWM signals with different duty ratios to the first resistor R1, so that the PWM signals pass through the low-pass filtering action of the first resistor R1 and the first capacitor C1, and the voltage at two ends of the second resistor R2 changes, so that the first PNP triode Q1 can be controlled to sequentially work in an amplification region, a cut-off region and a saturation region, and based on the reasonable setting of the respective resistance values of the second resistor R2, the third resistor R3 and the fourth resistor R4, the second circuit 402 can stably output the second voltage V2 meeting the target requirement, and the problem that the temperature of the second voltage V2 can drift due to the change of the working environment temperature of the first PNP triode Q1 is avoided.

In another possible implementation, in the case that the amplitude of the second voltage V2 is larger, the voltage endurance of one transistor is considered, and therefore, a plurality of serially connected triodes can be added to increase the overall voltage endurance of the transistor. Alternatively, as shown in fig. 3, the second circuit 402 may include: the circuit comprises a fifth resistor R5, M sixth resistors R6, M second PNP type triodes Q2 and a seventh resistor R7, wherein M is a positive integer larger than or equal to 2.

The first end of the fifth resistor R5 is connected to the first circuit 401, the M sixth resistors R6 are connected in series, the M second PNP transistor Q2 are connected in series, the first end of the sixth resistor R6 on the side of the M sixth resistors R6 connected in series and the base of the second PNP transistor Q2 on the side of the M second PNP transistor Q2 connected in series are both connected to the second end of the fifth resistor R5, the fifth resistor R5 functions as a current limiter, and the voltage at the second end of the fifth resistor R5 is regarded as the voltage at the point B. The first end of the nth sixth resistor R6 is connected to the base of the nth second PNP transistor Q2, where n is a positive integer greater than 0 and less than or equal to M, the emitter of the second PNP transistor Q2 located on one side of the M serially connected second PNP transistors Q2 is connected to a third voltage V3, the amplitude of the third voltage V3 is less than the amplitude of the first voltage V1, the second end of the sixth resistor R6 located on the other side of the M serially connected sixth resistors R6 and the collector of the second PNP transistor Q2 located on the other side of the M serially connected second PNP transistors Q2 are both connected to the first end of the seventh resistor R7, the first end of the seventh resistor R7 is used to output a second voltage V2, and the second end of the seventh resistor R7 is connected to the first voltage V1.

Based on the above connection relationship, as the duty ratio of the PWM signal is gradually increased (e.g., slowly increased or stepwise increased, such as from 25% to 30%, further from 30% to 35%, etc.), the second voltage V2 is slowly increased or stepwise increased, and when the first circuit 401 receives the PWM signal with the first duty ratio, the high-voltage divider 400 is activated. At this time, the voltage at the point a is greater than the voltage at the point B (i.e., the difference between the third voltage V3 and the threshold voltage of the second PNP transistor Q2), so that the M second PNP transistors Q2 all work in the amplification region, and the first voltage V1 is amplified, and the amplitude of the second voltage V2 is gradually increased, thereby preventing the second voltage V2 from overshooting, playing a role in buffering, and avoiding affecting the first voltage V1.

When the first circuit 401 receives the PWM signal with the second duty ratio, the high voltage dividing device 400 operates. At this time, the voltage at the point a is much greater than the voltage at the point B (at this time, the voltage at the point B is greater than the difference between the third voltage V3 and the threshold voltage of the second PNP transistor Q2), so that the M second PNP transistors Q2 all operate in the cut-off region, and based on the reasonable setting of the respective resistances of the fifth resistor R5, the sixth resistor R6 and the seventh resistor R7, the voltage division of the first voltage V1 is achieved so as to output the second voltage V2 with the largest amplitude, that is, the M second PNP transistor Q2 all operate in the cut-off region when the second voltage V2 is about to reach the amplitude of the target requirement, so as to control the amplitude of the second voltage V2 to be the largest, thereby not only meeting the target requirement of the high voltage, solving the problem that the second voltage V2 may generate temperature drift, and after the M second PNP transistor Q2 all operates in the cut-off region, the amplitude of the second voltage V2 depends on the values of the fifth resistor R5, the sixth resistor R6 and the seventh resistor R7, the influence of M second PNP type triodes Q2 can not be caused, and the stability of the second voltage V2 is ensured.

When the first circuit 401 receives the PWM signal with the third duty ratio, the high voltage dividing device 400 is turned off. At this time, the voltage at the point a is less than or equal to the voltage at the point B (i.e., the difference between the third voltage V3 and the threshold voltage of the second PNP transistor Q2), so that the M second PNP transistors Q2 all operate in the saturation region, and the first voltage V1 is turned off to control the amplitude of the second voltage V2 to be zero, thereby stopping the output of the second voltage V2.

The M second PNP transistors Q2 have the same working principle as the first PNP transistor Q1 in the above feasible implementation manner.

Illustratively, the present application provides a control method of a high-pressure voltage divider. Fig. 7 is a schematic flowchart of a control method of a high-pressure voltage divider according to an embodiment of the present disclosure. The control method of the high-pressure partial pressure device of the present application can be applied to the high-pressure partial pressure devices shown in fig. 1 to 6.

As shown in fig. 7, the method may include:

s101, the high-voltage division device receives a first voltage from a power supply.

S102, when the high-voltage division device is started, the high-voltage division device receives a Pulse Width Modulation (PWM) signal with a first duty ratio from a controller, and gradually increases the amplitude of a second voltage based on the PWM signal with the first duty ratio; when the high-voltage division device works, receiving a PWM signal with a second duty ratio from the controller, and outputting a second voltage with the maximum amplitude value based on the PWM signal with the second duty ratio; when the high-voltage division device is turned off, receiving a PWM signal with a third duty ratio from the controller, and stopping the output of the second voltage based on the PWM signal with the third duty ratio; the first duty cycle is less than the second duty cycle and the third duty cycle is less than the first duty cycle.

The implementation processes of

steps

101 and 102 specifically refer to the description contents of the embodiments in fig. 1 to 6, which are not described herein again.

According to the control method of the high-voltage division device, the high-voltage division device receives a first voltage from a power supply, and when the high-voltage division device is started, the slave controller receives a Pulse Width Modulation (PWM) signal with a duty ratio of a first duty ratio, and based on the PWM signal with the duty ratio of the first duty ratio, the amplitude of a second voltage is gradually increased; when the high-voltage division device works, receiving a PWM signal with a second duty ratio from the controller, and outputting a second voltage with the maximum amplitude value based on the PWM signal with the second duty ratio; when the high-voltage division device is turned off, receiving a PWM signal with a third duty ratio from the controller, and stopping the output of the second voltage based on the PWM signal with the third duty ratio; the first duty cycle is less than the second duty cycle and the third duty cycle is less than the first duty cycle. In this application, high pressure bleeder mechanism can be based on the PWM signal of different duty cycles, determine high pressure bleeder mechanism's operating condition, so that control high pressure bleeder mechanism cooperates high pressure bleeder mechanism's operating condition, realize carrying out different operations to the second voltage through the power supply of first voltage, not only make the amplitude of second voltage promote gradually, still make the amplitude of the second voltage of output the biggest, also can stop the output of second voltage, thereby, the voltage that high pressure bleeder mechanism output not only can not receive the influence that the temperature floats, still satisfy the target demand of high voltage, be favorable to image forming device to stabilize the formation of image, image forming device's working property has been promoted, make image forming device possess the competitiveness.

Illustratively, the present application also provides an image forming apparatus. Fig. 8a is a schematic structural diagram of an image forming apparatus according to an embodiment of the present application. As shown in fig. 8a, the image forming apparatus 1 of the present application may include: a controller 200, a power supply 300, and a high voltage divider 400 as shown in fig. 1-6.

The controller 200 is connected to the high voltage divider 400, and is configured to send a PWM signal to the high voltage divider 400; the power supply 300 is connected with the high-voltage divider 400 and is used for providing a first voltage V1 to the high-voltage divider 400; the high voltage dividing device 400 is connected to the image forming apparatus body 100, and supplies a second voltage V2 to the image forming apparatus body 100.

Optionally, the method further comprises: the high voltage divider 400 is gradually increased with the duty ratio of the PWM signal, and is activated when the PWM signal has a first duty ratio.

The high voltage divider 400 may be disposed on a single board, or may be disposed on a board together with the power supply 300, which is not limited in this application.

The source of the first voltage V1 is not limited in this application. Alternatively, on the basis of the embodiment shown in fig. 8a, as shown in fig. 8b, the image forming apparatus 1 may further include: high voltage generation circuit 500. The high voltage generating circuit 500 is connected to the power supply 300 and the high voltage divider 400, respectively. The power supply 300 is configured to provide the fourth voltage to the high voltage generating circuit 500, and the high voltage generating circuit 500 is configured to provide the first voltage V1 to the high voltage divider 400.

The present application does not limit the specific structure of the image forming apparatus main body 100. Alternatively, as shown in fig. 9, the image forming apparatus body 100 may include: a photosensitive drum 101, a charging roller 102, a developing roller 103, a transfer roller 104, an entrance paper cassette 105, a paper feed roller 106, a conveying roller 107, a laser 108, a heat roller 109, a pressure roller 110, a discharge roller 111, and a discharge paper cassette 112.

Wherein the high voltage dividing device 400 is used to supply the second voltage V2 to at least one of the charging roller 102, the developing roller 103, the transfer roller 104, the heat roller 109, and the pressure roller 110. In addition, the power supply 300 may supply electric power to at least one of the charging roller 102, the developing roller 103, the transfer roller 104, the heat roller 109, and the pressure roller 110. For example, the power supply 300 supplies power to the transfer roller 104 via the transfer power supply 115 in the image forming apparatus body 100.

Among them, the power supply 300 may also supply power to the charging roller 102, such as the power supply 300 supplies power to the charging roller 102 through the charging power supply 113 in the image forming apparatus body 100, and may also supply power to the developing roller 103, such as the power supply 300 supplies power to the developing roller 103 through the developing power supply 114 in the image forming apparatus body 100.

Specifically, the high voltage dividing device 400 is used to supply the second voltage V2 to the hot roller 109 via the hot roller power supply 116 in the image forming apparatus body 100, and the power supply 300 supplies power to the charging roller 102, as the power supply 300 supplies power to the charging roller 102 via the charging power supply 113 in the image forming apparatus body 100.

The inlet cassette 105 stores sheets, and the paper feed roller 106 conveys the stored sheets to the conveying path. The conveying roller 107 is used for conveying a sheet to a nip region between the photosensitive drum 101 and the transfer roller 104, the photosensitive drum 101 and the transfer roller 104 convey the sheet after image formation to a nip region between the heat roller 109 and the pressure roller 110, the heat roller 109 and the pressure roller 110 convey the sheet after fixing to the discharge roller 111, and the discharge roller 111 discharges the sheet to the discharge tray 112.

The charging roller 102 is used for charging the surface of the photosensitive drum 101, the laser 108 emits a laser beam to form an electrostatic latent image on the surface of the photosensitive drum 101, and the developing roller 103 is used for developing and forming a toner image on the surface of the photosensitive drum 101. When the paper passes through the nip between the photosensitive drum 101 and the transfer roller 104, the photosensitive drum 101 transfers the toner image formed on the surface thereof to the paper by the transfer roller 104 or the like. A heat roller 109 and a pressure roller 110 are used to fix the toner image on the paper. The sheets after fixing are discharged and stacked via a discharge tray 112 by the conveying action of a discharge roller 111.

Next, the power supply of the image forming apparatus 1 of the present invention during image formation will be described in detail with reference to fig. 10.

As shown in fig. 10, the charging power supply 113 applies a direct-current voltage to the charging roller 102. The rotation direction of the photosensitive drum 101 is as indicated by an arrow a, the surface of the photosensitive drum 101 is charged by the charging roller 102 to a predetermined dc voltage, the laser 108 generates a laser beam according to an image signal, and the negative charge on the surface of the photosensitive drum 101 decreases with the irradiation of the laser beam by the laser 108 to form a laser irradiation region (also called an exposure region), that is, the surface of the photosensitive drum 101 forms an electrostatic latent image according to the image signal. During image formation, a developing power supply 114 is applied to the developing roller 103, a developing voltage is in a form of superposition of an alternating current voltage and a direct current voltage, an electric field is formed between the developing roller 103 and a clamping area of the photosensitive drum 101, and negative-polarity carbon powder attached to the developing roller 103 jumps to an exposure area of the photosensitive drum 101 under the action of the electric field force. The paper P is conveyed along the arrow B direction, the transfer power supply 115 comprises a positive pressure unit and a negative pressure unit, during image formation, the positive pressure unit of the transfer power supply 115 provides positive pressure to the transfer roller 104, when the paper P is conveyed to a clamping area between the transfer roller 104 and the photosensitive drum 101, negative carbon powder is transferred from the photosensitive drum 101 to the paper P due to the action of an electric field, carbon powder on the surface of the photosensitive drum 101 cannot be completely transferred to the paper P in the transfer process, and therefore the negative pressure unit of the transfer power supply 115 (such as a voltage of thousands of volts) applies negative pressure to the transfer roller 104 before and after transfer, and residual carbon powder returns to the surface of the photosensitive drum 101. The toner on the paper P forms a final printed image by the heating action of the heat roller 109 and the pressure roller 110, and the heat roller power supply 116 is used for providing negative pressure to the heat roller, and the negative pressure is used for preventing toner scattering and tailing problems generated when the paper P enters a clamping area between the heat roller 109 and the pressure roller 110.

The image forming apparatus provided by the present application includes the above-mentioned high voltage divider, and the above-mentioned embodiments can be implemented, and specific implementation principles and technical effects thereof can be referred to the method embodiment shown in fig. 7, which is not described herein again.

Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A high pressure partial pressure apparatus, comprising: a first circuit and a second circuit electrically connected;

the first circuit is configured to receive a PWM signal with a first duty ratio from a controller when the high-voltage division device is started; when the high-voltage division device works, receiving a PWM signal with a second duty ratio from the controller; receiving the PWM signal with a third duty ratio from the controller when the high-voltage division device is turned off;

the second circuit configured to receive a first voltage from a power supply;

the second circuit is further configured to gradually increase the amplitude of the second voltage based on the PWM signal having the first duty ratio; outputting a second voltage with the maximum amplitude value based on the PWM signal with the duty ratio as the second duty ratio; stopping the output of the second voltage based on the PWM signal whose duty ratio is a third duty ratio; the first duty cycle is less than the second duty cycle, and the third duty cycle is less than the first duty cycle;

the second circuit comprises a second resistor, a third resistor, a first PNP triode and a fourth resistor, wherein the first end of the second resistor is connected with the first circuit, the second end of the second resistor is respectively connected with the first end of the third resistor and the base electrode of the first PNP triode, the emitter electrode of the first PNP triode is connected with a third voltage, the amplitude of the third voltage is smaller than that of the first voltage, the collector electrode of the first PNP triode and the second end of the third resistor are both connected with the first end of the fourth resistor, the first end of the fourth resistor is used for outputting the second voltage, and the second end of the fourth resistor is connected with the first voltage; alternatively, the first and second electrodes may be,

the second circuit comprises a fifth resistor, M sixth resistors, M second PNP type triodes and a seventh resistor, wherein M is a positive integer greater than or equal to 2; wherein, the first end of the fifth resistor with the first circuit connection, M sixth resistors series connection, M second PNP type triode series connection, the first end of the sixth resistor that is located M sixth resistors one side of series connection and the base of the second PNP type triode that is located M second PNP type triode one side of series connection all with the second end of the fifth resistor is connected, the first end of the nth sixth resistor is connected with the base of the nth second PNP type triode, n is taken to be more than 0 and less than or equal to M positive integer, the emitter of the second PNP type triode that is located M second PNP type triode one side of series connection is connected with the third voltage, the amplitude of the third voltage is less than the amplitude of the first voltage, the second end of the sixth resistor that is located M sixth resistors other side of series connection and the collector of the second PNP type triode that is located M second PNP type triode other side of series connection all with the collector of the seventh resistor The first end of the seventh resistor is connected, the first end of the seventh resistor is used for outputting the second voltage, and the second end of the seventh resistor is connected with the first voltage.

2. The high voltage divider device of claim 1, further configured to start when the duty ratio is a first duty ratio of the PWM signal as the duty ratio of the PWM signal is gradually increased.

3. The high voltage divider according to claim 1 or 2, wherein the first circuit comprises: a first resistor and a first capacitor;

the first end of the first resistor is used for receiving a PWM signal, the second end of the first resistor and the first end of the first capacitor are both connected with the second circuit, and the second end of the first capacitor is grounded.

4. The high pressure partial pressure apparatus of claim 1,

the second circuit is specifically configured to adjust the first PNP type triode to operate in the amplification region based on the PWM signal with the first duty cycle to gradually increase the amplitude of the second voltage; based on the PWM signal with the duty ratio being the second duty ratio, the first PNP type triode is adjusted to work in a cut-off region so as to output a second voltage with the maximum amplitude; and adjusting the first PNP type triode to work in a saturation region based on the PWM signal with the third duty ratio to control the amplitude of the second voltage to be zero.

5. The high pressure partial pressure apparatus of claim 1,

the second circuit is specifically configured to adjust the M second PNP type triodes to work in the amplification region based on the PWM signal with the first duty ratio, so as to gradually increase the amplitude of the second voltage; based on the PWM signal with the duty ratio being the second duty ratio, adjusting the M second PNP type triodes to work in a cut-off region so as to output a second voltage with the maximum amplitude; and adjusting the M second PNP type triodes to work in a saturation region based on the PWM signal with the third duty ratio to control the amplitude of the second voltage to be zero.

6. An image forming apparatus, comprising: an image forming apparatus body, a controller, a power supply source, and the high voltage dividing apparatus according to any one of claims 1 to 5;

the controller is connected with the high-voltage division device and used for sending a Pulse Width Modulation (PWM) signal to the high-voltage division device; the power supply is connected with the high-voltage division device and used for providing a first voltage for the high-voltage division device; the high-voltage divider is connected with the image forming device body and used for providing a second voltage for the image forming device body.

7. The image forming apparatus according to claim 6, further comprising: a high voltage generating circuit;

the high-voltage generating circuit is respectively connected with the power supply and the high-voltage dividing device;

the power supply is used for providing a fourth voltage for the high-voltage generating circuit, and the high-voltage dividing device is used for providing the first voltage for the high-voltage dividing device.

8. The image forming apparatus according to claim 6 or 7, wherein the image forming apparatus body includes: the device comprises a photosensitive drum, a charging roller, a developing roller, a transfer roller, an entering paper box, a paper feeding roller, a conveying roller, a laser, a hot roller, a press roller, a discharging roller and a discharging paper box;

wherein the high voltage dividing device is configured to supply the second voltage to at least one of the charging roller, the developing roller, the transfer roller, the heat roller, and the pressure roller.

9. The image forming apparatus as claimed in claim 8, wherein the high voltage dividing means is further configured to supply the second voltage to the heat roller; the power supply is used for supplying the first voltage to the charging roller.

10. A control method of a high-voltage division device is applied to the high-voltage division device, the high-voltage division device comprises a first circuit and a second circuit which are electrically connected, and the method comprises the following steps:

the second circuit receives a first voltage from a power supply;

the first circuit receives a Pulse Width Modulation (PWM) signal with a first duty ratio from a controller when the high-voltage division device is started, and the second circuit gradually increases the amplitude of a second voltage based on the PWM signal with the first duty ratio;

the first circuit receives a PWM signal with a second duty ratio from the controller when the high-voltage division device works, and the second circuit outputs a second voltage with the maximum amplitude value based on the PWM signal with the second duty ratio;

the first circuit receives the PWM signal with a third duty ratio from the controller when the high-voltage divider is turned off, and the second circuit stops the output of the second voltage based on the PWM signal with the third duty ratio;

the first duty cycle is less than the second duty cycle, and the third duty cycle is less than the first duty cycle;