Circuit for controlling high voltage output

Abstract

The utility model relates to a circuit for controlling high voltage output. The circuit for controlling high-voltage output comprises a mainboard, a limiting module, a power supply module and an output end, the limiting module comprises a current limiting unit and a voltage withstanding unit, the current limiting unit is electrically connected with the mainboard, and the voltage withstanding unit is electrically connected with the current limiting unit; the power supply module is electrically connected with the voltage withstanding unit; the output end is electrically connected with the power module. According to the scheme provided by the invention, high voltage can be turned off when the printer is idle, so that resources are saved.

Description

Technical Field

[0001] The utility model relates to the technical field of circuit design, in particular to a circuit for controlling high voltage output. Background Art

[0002] A laser printer is a printing device that uses a combination of laser technology and electronic photography technology. It has a fast printing speed and high imaging quality.

[0003] In the related art, laser printers usually require an internal power board to provide several high voltages for the printer to use. However, these high voltages are only needed when printing. When the printer is idle, if the high voltage is continuously output, it will cause resource consumption and waste. Utility Model Content

[0004] The purpose of the utility model is to overcome the shortcomings of the prior art and provide a circuit for controlling high voltage output, which can turn off the high voltage when the printer is idle, thereby saving resources.

[0005] The purpose of this utility model is achieved through the following technical solutions:

[0006] The first aspect of the present application provides a circuit for controlling high-voltage output, comprising: a main board; a limiting module, comprising a current limiting unit and a voltage-withstanding unit, the current limiting unit being electrically connected to the main board, and the voltage-withstanding unit being electrically connected to the current limiting unit; a power supply module being electrically connected to the voltage-withstanding unit; and an output end being electrically connected to the power supply module.

[0007] The current limiting unit includes a resistor R2 and a diode D2. The first end of the resistor R2 is electrically connected to the main board, and the second end of the resistor R2 is electrically connected to the first end of the diode D2.

[0008] The voltage-withstanding unit includes a transistor Q1 , and a base of the transistor Q1 is electrically connected to a second end of the diode D2 .

[0009] The current limiting unit further includes a resistor R3 and a diode D3. The first end of the resistor R3 is electrically connected to the main board, and the second end of the resistor R3 is electrically connected to the first end of the diode D3.

[0010] The voltage-withstand unit includes a transistor Q2 , a base of the transistor Q2 is electrically connected to the second end of the diode D3 , and a collector of the transistor Q2 is electrically connected to the emitter of the transistor Q1 .

[0011] The current limiting unit also includes a resistor R4 and a resistor R5, wherein a first end of the resistor R4 is electrically connected to the mainboard, a first end of the resistor R5 is electrically connected to the mainboard, a first end of the resistor R4 is electrically connected to a first end of the resistor R5, and a second end of the resistor R5 is grounded.

[0012] The withstand voltage unit includes a transistor Q3 , a base of the transistor Q3 is electrically connected to the second end of the resistor R4 , a collector of the transistor Q3 is electrically connected to the emitter of the transistor Q2 , and the emitter of the transistor Q3 is grounded.

[0013] The power module includes a power input terminal, a diode D1, a capacitor C1 and a resistor R1, wherein a first end of the diode D1 is electrically connected to the power input terminal, a second end of the diode D1 is electrically connected to a first end of the capacitor C1, a second end of the capacitor C1 is grounded, a first end of the resistor R1 is electrically connected to a second end of the diode D1, and a second end of the resistor R1 is electrically connected to a collector of the transistor Q1.

[0014] The output end includes a Zener diode ZD1, a Zener diode ZD2, a first output pin and a second output pin. The first end of the Zener diode ZD1 is electrically connected to the first output pin, the second end of the Zener diode ZD1 is electrically connected to the first end of the Zener diode ZD2, the first output pin is also electrically connected to the second end of the resistor R1, and the second output pin is electrically connected to the second end of the diode ZD1 and the first end of the Zener diode ZD2, respectively.

[0015] The output end also includes a Zener diode ZD3, a Zener diode ZD4 and a third output pin, the first end of the Zener diode ZD3 is electrically connected to the third output pin and the second end of the Zener diode ZD2 respectively, the second end of the Zener diode ZD3 is electrically connected to the first end of the Zener diode ZD4, and the second end of the Zener diode ZD4 is grounded.

[0016] Compared with the prior art, the utility model has at least the following advantages:

[0017] By setting the current limiting unit and the voltage-withstand unit, when the mainboard inputs a low level, the voltage-withstand unit is not turned on, and the output voltage output is normal; when the mainboard inputs a high level, the voltage-withstand unit is turned on and pulled down to ground, and the output voltage is not output. In this way, the high voltage can be turned off when the printer is idle, thereby saving resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings required for use in the embodiments are briefly introduced below.

[0019] Figure 1 This is a functional module diagram of a circuit for controlling high voltage output in one embodiment of the utility model;

[0020] Figure 2 Detailed description of the invention The figure is a circuit diagram of a circuit for controlling high voltage output in one embodiment of the present invention. DETAILED DESCRIPTION

[0021] The embodiments of the present application will be described in more detail below with reference to the accompanying drawings. Although the embodiments of the present application are shown in the accompanying drawings, it should be understood that the present application can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to make the present application more thorough and complete, and to fully convey the scope of the present application to those skilled in the art.

[0022] It should be understood that although the terms "first", "second", "third", etc. may be used in this application to describe various information, this information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of this application, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0023] Unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, or a detachable connection or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0024] See also Figure 1 A circuit for controlling high voltage output includes: a main board 100, a limiting module 200, a power module 300 and an output end 400, the limiting module 200 includes a current limiting unit and a voltage-resistant unit, the current limiting unit is electrically connected to the main board, and the voltage-resistant unit is electrically connected to the current limiting unit; the power module 300 is electrically connected to the voltage-resistant unit; and the output end 400 is electrically connected to the power module 300.

[0025] It should be noted that the power module 300 is used to provide power, and the main board 100 is set in the laser printer to provide a high level or a low level, such as Figure 2HV Control in the figure is the input terminal of the mainboard 100, and the limiting module 200 is used to control the voltage output of the output terminal. Furthermore, by setting the current limiting unit and the voltage-resistant unit, when the mainboard 100 inputs a low level, the voltage-resistant unit is not turned on, and the voltage output of the output terminal 400 is normal at this time; when the mainboard 100 inputs a high level, the voltage-resistant unit is turned on and pulled down to ground, and the voltage of the output terminal 400 is not output at this time. In the above manner, the high voltage can be turned off when the printer is idle, thereby saving resources.

[0026] See also Figure 2 In one embodiment, the current limiting unit includes a resistor R2 and a diode D2, a first end of the resistor R2 is electrically connected to the mainboard, and a second end of the resistor R2 is electrically connected to a first end of the diode D2.

[0027] It should be noted that the resistor R2 plays a role of current limiting, and the diode D2 plays a role of electrostatic protection.

[0028] See also Figure 2 In one embodiment, the voltage-withstanding unit includes a transistor Q1 , and a base of the transistor Q1 is electrically connected to a second end of the diode D2 .

[0029] It should be noted that the transistor Q1 plays a role of withstand voltage. Specifically, when the mainboard 100 outputs a high level, the transistor Q1 will be turned on, and when the mainboard 100 outputs a low level, the transistor Q1 will not be turned on.

[0030] See also Figure 2 In one embodiment, the current limiting unit further includes a resistor R3 and a diode D3, a first end of the resistor R3 is electrically connected to the mainboard, and a second end of the resistor R3 is electrically connected to a first end of the diode D3.

[0031] It should be noted that the resistor R3 plays a role of current limiting, and the diode D3 plays a role of electrostatic protection.

[0032] See also Figure 2 In one embodiment, the withstand voltage unit includes a transistor Q2, a base of the transistor Q2 is electrically connected to the second end of the diode D3, and a collector of the transistor Q2 is electrically connected to the emitter of the transistor Q1.

[0033] It should be noted that the transistor Q2 plays a role of withstand voltage. Specifically, when the mainboard 100 outputs a high level, the transistor Q2 will be turned on, and when the mainboard 100 outputs a low level, the transistor Q2 will not be turned on.

[0034] See also Figure 2In one embodiment, the current limiting unit also includes a resistor R4 and a resistor R5, the first end of the resistor R4 is electrically connected to the mainboard, the first end of the resistor R5 is electrically connected to the mainboard, the first end of the resistor R4 is electrically connected to the first end of the resistor R5, and the second end of the resistor R5 is grounded.

[0035] It should be noted that the resistors R4 and R5 play a role in current limiting.

[0036] See also Figure 2 In one embodiment, the withstand voltage unit includes a transistor Q3, a base of the transistor Q3 is electrically connected to the second end of the resistor R4, a collector of the transistor Q3 is electrically connected to the emitter of the transistor Q2, and the emitter of the transistor Q3 is grounded.

[0037] It should be noted that the transistor Q2 plays a role of withstand voltage. Specifically, when the mainboard 100 outputs a high level, the transistor Q3 will be turned on, and when the mainboard 100 outputs a low level, the transistor Q3 will not be turned on.

[0038] See also Figure 2 In one embodiment, the power module 300 includes a power input terminal, a diode D1, a capacitor C1 and a resistor R1, a first end of the diode D1 is electrically connected to the power input terminal, a second end of the diode D1 is electrically connected to the first end of the capacitor C1, a second end of the capacitor C1 is grounded, a first end of the resistor R1 is electrically connected to the second end of the diode D1, and a second end of the resistor R1 is electrically connected to the collector of the transistor Q1.

[0039] It should be noted that the diode D1 , the capacitor C1 and the resistor R1 play the role of rectification and filtering.

[0040] See also Figure 2 In one embodiment, the output end 400 includes a Zener diode ZD1, a Zener diode ZD2, a first output pin, and a second output pin. The first end of the Zener diode ZD1 is electrically connected to the first output pin, the second end of the Zener diode ZD1 is electrically connected to the first end of the Zener diode ZD2, the first output pin is also electrically connected to the second end of the resistor R1, and the second output pin is electrically connected to the second end of the diode ZD1 and the first end of the Zener diode ZD2. Specifically, the output end 400 also includes a Zener diode ZD3, a Zener diode ZD4, and a third output pin. The first end of the Zener diode ZD3 is electrically connected to the third output pin and the second end of the Zener diode ZD2, the second end of the Zener diode ZD3 is electrically connected to the first end of the Zener diode ZD4, and the second end of the Zener diode ZD4 is grounded.

[0041] It should be noted that the first output pin outputs a voltage of 750 V, the second output pin outputs a voltage of 550 V, and the third output pin outputs a voltage of 350 V. Further, in order to ensure the stability of the voltage output, the present application sets up a Zener diode ZD1, a Zener diode ZD2, a Zener diode ZD3 and a Zener diode ZD4.

[0042] The following is an explanation of the design principles of this application:

[0043] When the motherboard 100 outputs a low level, the transistors Q1, Q2 and Q3 are not conducting, and the first output pin, the second output pin and the third output pin normally output high voltage. When the motherboard 100 outputs a high level, the transistors Q1, Q2 and Q3 are conducting and pulled down to ground, and the first output pin, the second output pin and the third output pin do not output high voltage.

[0044] The scheme of the present application has been described in detail above with reference to the accompanying drawings. In the above embodiments, the descriptions of the various embodiments have their own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments. Those skilled in the art should also be aware that the actions and modules involved in the specification are not necessarily required for the present application. In addition, it can be understood that the steps in the method of the embodiment of the present application can be adjusted in order, merged and deleted according to actual needs, and the modules in the device of the embodiment of the present application can be merged, divided and deleted according to actual needs.

[0045] The embodiments of the present application have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The selection of terms used herein is intended to best explain the principles of the embodiments, practical applications, or improvements to the technology in the market, or to enable other persons of ordinary skill in the art to understand the embodiments disclosed herein.

Claims

1. A circuit for controlling high voltage output, characterized in that: include: Motherboard; A limiting module, comprising a current limiting unit and a voltage-resistant unit, wherein the current limiting unit is electrically connected to the mainboard, and the voltage-resistant unit is electrically connected to the current limiting unit; A power module, electrically connected to the voltage-resistant unit; The output end is electrically connected to the power module.

2. The circuit for controlling high voltage output according to claim 1, characterized in that: The current limiting unit includes a resistor R2 and a diode D2. The first end of the resistor R2 is electrically connected to the main board, and the second end of the resistor R2 is electrically connected to the first end of the diode D2.

3. The circuit for controlling high voltage output according to claim 2, characterized in that: The voltage-withstanding unit includes a transistor Q1 , and a base of the transistor Q1 is electrically connected to a second end of the diode D2 .

4. The circuit for controlling high voltage output according to claim 3, characterized in that: The current limiting unit further includes a resistor R3 and a diode D3. The first end of the resistor R3 is electrically connected to the main board, and the second end of the resistor R3 is electrically connected to the first end of the diode D3.

5. The circuit for controlling high voltage output according to claim 4, characterized in that: The voltage-withstand unit includes a transistor Q2 , a base of the transistor Q2 is electrically connected to the second end of the diode D3 , and a collector of the transistor Q2 is electrically connected to the emitter of the transistor Q1 .

6. The circuit for controlling high voltage output according to claim 5, characterized in that: The current limiting unit also includes a resistor R4 and a resistor R5, wherein a first end of the resistor R4 is electrically connected to the mainboard, a first end of the resistor R5 is electrically connected to the mainboard, a first end of the resistor R4 is electrically connected to a first end of the resistor R5, and a second end of the resistor R5 is grounded.

7. The circuit for controlling high voltage output according to claim 6, characterized in that: The withstand voltage unit includes a transistor Q3 , a base of the transistor Q3 is electrically connected to the second end of the resistor R4 , a collector of the transistor Q3 is electrically connected to the emitter of the transistor Q2 , and the emitter of the transistor Q3 is grounded.

8. The circuit for controlling high voltage output according to claim 6, characterized in that: The power module includes a power input terminal, a diode D1, a capacitor C1 and a resistor R1, wherein a first end of the diode D1 is electrically connected to the power input terminal, a second end of the diode D1 is electrically connected to a first end of the capacitor C1, a second end of the capacitor C1 is grounded, a first end of the resistor R1 is electrically connected to a second end of the diode D1, and a second end of the resistor R1 is electrically connected to a collector of the transistor Q1.

9. The circuit for controlling high voltage output according to claim 8, characterized in that: The output end includes a Zener diode ZD1, a Zener diode ZD2, a first output pin and a second output pin. The first end of the Zener diode ZD1 is electrically connected to the first output pin, the second end of the Zener diode ZD1 is electrically connected to the first end of the Zener diode ZD2, the first output pin is also electrically connected to the second end of the resistor R1, and the second output pin is electrically connected to the second end of the diode ZD1 and the first end of the Zener diode ZD2, respectively.

10. The circuit for controlling high voltage output according to claim 9, characterized in that: The output end also includes a Zener diode ZD3, a Zener diode ZD4 and a third output pin, the first end of the Zener diode ZD3 is electrically connected to the third output pin and the second end of the Zener diode ZD2 respectively, the second end of the Zener diode ZD3 is electrically connected to the first end of the Zener diode ZD4, and the second end of the Zener diode ZD4 is grounded.

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